View Source Kernel Release Notes
This document describes the changes made to the Kernel application.
Kernel 10.1.2
Fixed Bugs and Malfunctions
On windows the socket:recv could return with success ({ok, Data}) even though not all data had been read.
Own Id: OTP-19328
gen_udp:send on domain local can leak inet_reply messages.
Own Id: OTP-19332 Aux Id: #8989
Failure to create an UDP IPv6 socket when inet_backend = socket with certain IPv6 socket options.
Own Id: OTP-19357
net:getifaddrs does not properly report the running flag on windows.
Own Id: OTP-19366 Aux Id: OTP-19061, ERIERL-1134
Kernel 10.1.1
Fixed Bugs and Malfunctions
A bug has been fixed where receiving an SCTP message with
gen_sctp
could waste the first fragments of a message and only deliver the last fragment.This happened with low probability when the OS signaled that the socket was ready for reading in combination with an internal time-out retry.
A bug has been fixed with a lingering time-out from after an SCTP connect that could stop the flow of incoming messages on an active
gen_tcp
socket.Own Id: OTP-19235 Aux Id: ERIERL-1133, PR-8837
An boolean option
non_block_send
for SCTP, has ben added to be able to achieve the old behaviour to avoid blocking send operations by passing the OS network stack error message ({error,eagain}
through.Own Id: OTP-19258 Aux Id: OTP-19061, ERIERL-1134
Kernel 10.1
Fixed Bugs and Malfunctions
A faulty assertion was corrected in the
prim_tty
module. This assertion could trigger when invalid UTF-8 was read from stdin just as the mode was changed from unicode to latin1.Own Id: OTP-19097 Aux Id: PR-8503
Opening a
disk_log
file and combininghead_func
withrotate
options did not work.Own Id: OTP-19104 Aux Id: ERIERL-870
Fixed an error info printout for
erlang:is_process_alive/1
on non-local pids.Own Id: OTP-19134 Aux Id: PR-8560
A race in the kTLS flavour of SSL distribution has been fixed so that
inet_drv.c
doesn't read ahead too much data, which could cause the kTLS encryption to be activated too late when some encrypted data had already been read into theinet_drv.c
buffer as unencrypted.Fixed a deadlock when an application crashes during startup and log messages were sent to standard out. Logger would fail to print the messages to standard out and instead print them to standard error.
Own Id: OTP-19205
The
-proto_dist
init parameter will no longer be ignored when specified multiple times. It will now log a warning and use the first specified value.Own Id: OTP-19208 Aux Id: PR-8672
Corrected socket:ioctl for genaddr (SIOCGENADDR).
Own Id: OTP-19216
Improvements and New Features
Added functions
getservbyname
andgetservbyport
to thenet
module.Own Id: OTP-19101 Aux Id: OTP-18835
Introduced enet | esock variants of
inet
functions, either when called with sockets, with explicit inet_backend config or with the e inet_backend kernel config option.Own Id: OTP-19132 Aux Id: OTP-19101
The function
socket:i/0
now uses thenet
module (instead of theinet
module) for service translation.Own Id: OTP-19138 Aux Id: OTP-19101
A boolean option
read_ahead
has been implemented forgen_tcp
, defaulttrue
, to facilitate not reading past (caching data) the end of a packet. In particular, for kTLS, caching data could read in data that was supposed to be decrypted by the platform's network stack, before crypto parameters could be activated.Own Id: OTP-19199 Aux Id: OTP-19175, GH-8561, GH-8690, GH-8785
Kernel 10.0.1
Improvements and New Features
Kernel 10.0
Fixed Bugs and Malfunctions
Fixed a crash when calling
file:delete/2
with an empty option list.Own Id: OTP-18590 Aux Id: PR-7220
New functions have been added to the undocumented module
m:inet_dns
that take a flag to specify if encode/decode is for mDNS. This affects how CLASS values in the private range, with the top bit set, are handled.Own Id: OTP-18878 Aux Id: GH-7718, OTP-17734
The error information for
erlang:phash/2
has been corrected.Own Id: OTP-18904 Aux Id: PR-7960
get_until
requests using the I/O protocol now correctly return a binary or list wheneof
is the last item returned by the callback.Calling
logger:add_handlers/1
with config option now works.The
code:del_path/1
function now also works on paths added through-pa
,-pz
,-path
and the boot script.A call to
socket:[recv|recvfrom|recvmsg]/*
with Timeout = 0 on Windows could cause a (case clause) crash if data is immediately available.Own Id: OTP-19063 Aux Id: OTP-18835
Improve heuristic for when a characters is wide in the shell for systems with old libc versions.
Own Id: OTP-19087 Aux Id: PR-8382
Fix reading a line when reading from
io:user/0
to not consider\r
without\n
to be a new line whenerl
is started with-noshell
.Own Id: OTP-19088 Aux Id: PR-8396
Improvements and New Features
Added
file:read_file/2
with araw
option for reading files without going through the file server.Own Id: OTP-18589 Aux Id: PR-7220
The undocumented Erlang DNS resolver library (
inet_dns
andinet_res
) has been augmented to handle IXFR, NOTIFY, UPDATE and TSIG records. With this some bug fixes and code cleanup has been done, and the resolver used in the test suite has been changed to Knot DNS. See the source code.Kudos to Alexander Clouter that did almost all the work!
The
ebin
directories for escripts are now cached.Own Id: OTP-18778 Aux Id: PR-7556
-callback
attributes haven been added toapplication
,logger_handler
, andlogger_formatter
.Own Id: OTP-18795 Aux Id: PR-7703
Progress reports from before logger is started are now logged when log level is set to debug.
Own Id: OTP-18807 Aux Id: PR-7732 ERIERL-985
The
code:where_is_file/2
andcode:which/1
functions now check for existence of the file directly instead of listing the content of each directory in the code path.Own Id: OTP-18816 Aux Id: PR-7711
Type specs has been added to the
logger:Level/1,2,3
functions.Own Id: OTP-18820 Aux Id: PR-7779
For
inet_backend = socket
, setting theactive
socket option alone, toonce
,true
orN
has been optimized, as well as the corresponding data delivery.Own Id: OTP-18835
New functions
socket:sendv/*
for sending I/O vectors have been added.Own Id: OTP-18845
The shell now pages long output from the documentation help command (
h(Module)
), auto completions and the search command.Own Id: OTP-18846 Aux Id: PR-7845
Native coverage support has been implemented in the JIT. It will automatically be used by the
cover
tool to reduce the execution overhead when running cover-compiled code.There are also new APIs to support native coverage without using the
cover
tool.To instrument code for native coverage it must be compiled with the
line_coverage
option.To enable native coverage in the runtime system, start it like so:
$ erl +JPcover true
There are also the following new functions for supporting native coverage:
code:coverage_support/0
code:get_coverage/2
code:reset_coverage/1
code:get_coverage_mode/0
code:get_coverage_mode/1
code:set_coverage_mode/1
Own Id: OTP-18856 Aux Id: PR-7856
Optimized code loading by moving certain operations from the code server to the caller.
Own Id: OTP-18941 Aux Id: PR-7981
The documentation has been migrated to use Markdown and ExDoc.
Own Id: OTP-18955 Aux Id: PR-8026
Application startup has been optimized by removing an intermediary process.
Own Id: OTP-18963 Aux Id: PR-8042
The existing experimental support for archive files will be changed in a future release. The support for having an archive in an escript will remain, but the support for using archives in a release will either become more limited or completely removed.
As of Erlang/OTP 27, the function
code:lib_dir/2
, the-code_path_choice
flag, and usingerl_prim_loader
for reading members of an archive are deprecated.To remain compatible with future version of Erlang/OTP
escript
scripts that need to retrieve data files from its archive should useescript:extract/2
instead oferl_prim_loader
andcode:lib_dir/2
.POTENTIAL INCOMPATIBILITY
Own Id: OTP-18966 Aux Id: PR-8091
The undocumented and deprecated
file:pid2name
function has been removed.Own Id: OTP-18967 Aux Id: PR-8092
There is a new module
trace
in Kernel providing the same trace functionality aserlang:trace/3
anderlang:trace_pattern/3
, but with the addition of dynamic isolated trace sessions.Own Id: OTP-18980
Error logging has been improved when the
io:standard_io/0
reader and/or writer terminates with an error.Own Id: OTP-18989 Aux Id: PR-8103
inet_backend = socket
has been optimized and reworked to be more compatible with the originalinet_backend = inet
.Own Id: OTP-19004 Aux Id: OTP-18835
Add an simple example (echo server) )to the socket users guide.
Own Id: OTP-19042
inet:i/0,1,2
has been improved to allow port numbers to be shown explicitly.Own Id: OTP-19053 Aux Id: #6724
The
socket
documentation has been reworked, and due to that a few details were fixed:socket:is_supported/1
now returnstrue
for example forprotocols
that is a "category", not an item.socket:cancel_monitor/1
no longer badargs for a monitor that was set by another process, instead it returnsfalse
as for other unknownreference()
s.
Own Id: OTP-19054
Add
stdin
,stdout
andstderr
keys toio:getopts/1
onio:standard_io/0
to indicate if the respective I/O device is backed by a terminal.Own Id: OTP-19089 Aux Id: PR-8396
Kernel 9.2.4.2
Fixed Bugs and Malfunctions
A race in the kTLS flavour of SSL distribution has been fixed so inet_drv.c doesn't read ahead too much data which could cause the kTLS encryption to be activated too late when some encrypted data had already been read into the inet_drv.c buffer as unencrypted.
Own Id: OTP-19175 Aux Id: GH-8561, PR-8690
Fix a deadlock when an application crashes during startup and log messages were sent to standard out. Logger would fail to print the messages to standard out and instead print them to standard error.
Own Id: OTP-19205
Add the stdlib application parameters
shell_redraw_prompt_on_output
which when set tofalse
disables redrawing of the shell prompt if any other output is done.Own Id: OTP-19213 Aux Id: PR-8763 ERIERL-1108
Kernel 9.2.4.1
Fixed Bugs and Malfunctions
A call to socket:[recv|recvfrom|recvmsg]/* with Timeout = 0 on Windows could cause a (case clause) crash if data is immediately available.
Own Id: OTP-19063 Aux Id: OTP-18835
Open a
disk_log
file and combininghead_func
withrotate
options did not work.Own Id: OTP-19104 Aux Id: ERIERL-870
Kernel 9.2.4
Fixed Bugs and Malfunctions
Fix the shell Job Control Mode to not crash when typing
TAB
orCTRL+R
.Own Id: OTP-19072 Aux Id: PR-8391
Fix calls to blocking
application
APIs to throw an exception with reasonterminating
if called when the system is terminating.This is done in order to avoid deadlocks during shutdown or restart.
Own Id: OTP-19078 Aux Id: PR-8422
Kernel 9.2.3
Fixed Bugs and Malfunctions
When using IPv6, classic gen_udp failed to add (group) membership (drop was used instead).
Own Id: OTP-19049 Aux Id: #8176
The check in inet_res of the RD bit has been relaxed slightly.
Own Id: OTP-19056 Aux Id: PR-8312, OTP-17323
Kernel 9.2.2
Fixed Bugs and Malfunctions
Fix performance bug when using
io:fread
to read fromstandard_io
. This regression was introduced in OTP 26.0.Own Id: OTP-18910 Aux Id: PR-7933 GH-7924
A bug in the code server could cause it to crash in some concurrent scenarios. This bug was introduced in 26.1.
Own Id: OTP-18948 Aux Id: PR-8046
Fixed gen_udp:open/2 type spec to include already supported module socket address types.
Own Id: OTP-18990 Aux Id: GH-8158
Fix reading of password for ssh client when in
user_interactive
mode.Own Id: OTP-19007 Aux Id: ERIERL-1049
Kernel 9.2.1
Fixed Bugs and Malfunctions
Fix
group
(that is the shell) to properly handle when anget_until
callback function returned{done, eof, []}
when aneof
was detected.Own Id: OTP-18901
Kernel 9.2
Fixed Bugs and Malfunctions
For
inet_backend = socket
, an unexpected receive error such asetimedout
caused the receiving state machine server to crash. This bug has now been fixed.Own Id: OTP-18749 Aux Id: GH-7608
Fix bug where reading using
file
from a unicode enabledstandard_io
,standard_error
or any othergroup
backed device would result in incorrect values being returned or a crash.Now instead a no_translation error is returned to the caller when unicode data is read using
file
. See Using Unicode in the STDLIB User's Guide for more details on how to correctly read fromstandard_io
.Own Id: OTP-18800 Aux Id: PR-7714 GH-7591
The native resolver interface module has gotten a rewrite of its ETS table handling to minimize term copying, and also to move the handling of client time-outs to the clients, which helps the native resolver name server from digging itself into a tar pit when heavily loaded.
Own Id: OTP-18812 Aux Id: ERIERL-997
Replaced unintentional Erlang Public License 1.1 headers in some files with the intended Apache License 2.0 header.
Own Id: OTP-18815 Aux Id: PR-7780
Fix bug in
pg
if a client process both monitored a group/scope and joined a group. The termination of such process resulted in crash of thepg
server process.Own Id: OTP-18833 Aux Id: GH-7625, PR-7659
Fix crash when using
file:consult
and the underlying file read returns an error while reading.Own Id: OTP-18873 Aux Id: PR-7831
Corrected gen_tcp_socket listen option handling.
Own Id: OTP-18883 Aux Id: #7764
Improvements and New Features
Add Windows support for DGRAM socket connect.
Own Id: OTP-18762
Document the, previously opaque, types select_tag() and completion_tag().
Own Id: OTP-18818 Aux Id: #7337
Kernel 9.1
Fixed Bugs and Malfunctions
Fixed an issue with truncated crash slogans on failed emulator start.
Own Id: OTP-18623 Aux Id: GH-7344
Fix shell:start_interactive function specification.
Own Id: OTP-18628 Aux Id: GH-7280
Fix code:get_doc/1 to return missing, when it can't find erts instead of crashing.
Own Id: OTP-18654 Aux Id: PR-7404
Function socket:close/1 could cause a VM crash on Windows.
Own Id: OTP-18669 Aux Id: OTP-18029
Fix deadlock when
erl.exe
is used as part of a pipe on Windows and trying to set the encoding of thestandard_io
device.Own Id: OTP-18675 Aux Id: PR-7473 GH-7459
Expanded the documentation about how to use the
standard_io
,standard_error
anduser
I/O devices.Added the types
io:standard_io/0
,io:standard:error/0
andio:user/0
.Own Id: OTP-18676 Aux Id: PR-7473 GH-7459
Fix logger's overload protection mechanism to only fetch memory used by messages when needed.
Own Id: OTP-18677 Aux Id: PR-7418 GH-7417
Fixed a number of socket-related issues causing incompatibilities with gen_tcp and gen_udp respectively.
Own Id: OTP-18685
gen_tcp:connect with socket address and socket (inet-) backend fails because of missing callback function.
Own Id: OTP-18707 Aux Id: #7530
The DNS RR cache used by `inet_res` has been fixed to preserve insert order, which is beneficial when the DNS server returns RRs in some specific order for e.g load balancing purposes.
Own Id: OTP-18731 Aux Id: GH-7577, PR-7578
The options `reuseport`, `reuseport_lb` and `exclusiveaddruse` were accidentally not allowed for e.g `gen_udp:open/1,2`, which has now been corrected.
Own Id: OTP-18734 Aux Id: OTP-18344, PR-6522, GH-6461, GH-7569
gen_udp:recv/*
for Unix Domain Socket in binary mode and passive mode has been fixed to not crash.Own Id: OTP-18747 Aux Id: GH-7605
Fixed issue where cursor would not be placed at the end of the expression when navigating shell history.
Own Id: OTP-18757 Aux Id: PR-7631
Improvements and New Features
Update gen_tcp_socket and gen_udp_socket to handle 'completion' (socket on Windows).
Own Id: OTP-18586 Aux Id: OTP-18029
Add support for Unix Domain Sockets (only for STREAM sockets) on Windows for 'socket'.
Own Id: OTP-18611 Aux Id: OTP-18029, #5024
Add basic support for socket ioctl on Windows.
Own Id: OTP-18660
The
file:location/0
type is now exported.Own Id: OTP-18681
Add support for (Windows) socket option exclusiveaddruse.
Own Id: OTP-18686
[socket] Add support for the 'nopush' option.
Own Id: OTP-18687
Add support for socket option 'BSP STATE'.
Own Id: OTP-18693
Add tcp socket options 'keepcnt', 'keepidle' and 'keepintvl'.
Own Id: OTP-18698
Add support for misc (Windows) socket options ('max_msg_size' and 'maxdg').
Own Id: OTP-18710
The keyboard shortcuts for the shell are now configurable.
Own Id: OTP-18754 Aux Id: PR-7604 PR-7647
Optimized code_server to reduce repeated work when loading the same module concurrently.
Own Id: OTP-18755 Aux Id: PR-7503
Kernel 9.0.2
Fixed Bugs and Malfunctions
Fix bug where when you entered Alt+Enter in the terminal, the cursor would move to the last line, instead of moving to the next line.
Own Id: OTP-18580 Aux Id: PR-7242
Fix so that the shell does not crash on startup when termcap is not available.
Own Id: OTP-18624 Aux Id: GH-7296
Multiple socket:accept calls issue. When making multiple accept calls, only the last call is active.
Own Id: OTP-18635 Aux Id: #7328
Fix the shell to ignore terminal delay when the terminal capabilities report that they should be used.
Own Id: OTP-18636 Aux Id: PR-7352 GH-7308
Fix "oldshell" to echo characters while typing on Windows.
Own Id: OTP-18637 Aux Id: PR-7359 GH-7324
Fix eof handling when reading from stdin when erlang is started using
-noshell
.Own Id: OTP-18640 Aux Id: PR-7384 GH-7368 GH-7286 GH-6881
On Windows, a call to the function socket:close, when there are waiting active calls to read, write or accept functions, could hang.
Own Id: OTP-18646
Fix issues when reading or configuring
standard_io
on Windows when erl.exe is started using-noshell
flag.Own Id: OTP-18649 Aux Id: GH-7261 PR-7400
gen_udp:connect with inet_backend = socket fails when the Address is a hostname (string or atom).
Own Id: OTP-18650
Fixed problem which would cause shell to crash if particular escape sequence was written to stdout.
Own Id: OTP-18651 Aux Id: PR-7242
Fixed problem where output would disappear if it was received after a prompt was written in the shell.
Own Id: OTP-18652 Aux Id: PR-7242
Fix a crash where the location of erts could not be found in rebar3 dev builds.
Own Id: OTP-18656 Aux Id: PR-7404 GH-7390
Introduce the KERNEL application parameter
standard_io_encoding
that can be used to set the default encoding for standard_io. This option needs to be set tolatin1
if the application wants to treat all input data as bytes rather than utf-8 encoded characters.Own Id: OTP-18657 Aux Id: GH-7230 PR-7384
Kernel 9.0.1
Fixed Bugs and Malfunctions
The POSIX error
exdev
was sometimes incorrectly described as "cross domain link" in some error messages.Own Id: OTP-18578 Aux Id: GH-7213
Corrected the socket send function description (send with Timeout = nowait). The send function(s) could not return {ok, {RestData, SelectInfo}}
Own Id: OTP-18584 Aux Id: #7238
Kernel 9.0
Fixed Bugs and Malfunctions
Fixed a bug where duplicate keys were allowed in the .app file of an application. Duplicate keys are now rejected and the application will not start if they exist.
* POTENTIAL INCOMPATIBILITY *
Own Id: OTP-18210 Aux Id: GH-5877 PR-5878
Fix inconsistent handling in logger_formatter of the branched values in conditional branches. For example using
msg
in a conditional branch would not be formatted as it should before this fix.Own Id: OTP-18225 Aux Id: PR-6036
Fix the logger_std_h handler to log to standard_error if logging to standard_io fails for any reason.
Own Id: OTP-18226 Aux Id: PR-6253
Fix the TLS distribution to work when starting Erlang in embedded mode and a connection is done before kernel is fully started.
Own Id: OTP-18248 Aux Id: PR-6227 GH-6085
erl
-remsh
has been improved to provide better error reasons and work when using a shell without terminal support (that is an "oldshell").Own Id: OTP-18271 Aux Id: PR-6279
Fix logging of log events generated before kernel is started to not fail if the code for formatting those log messaged have not yet been loaded.
Own Id: OTP-18286 Aux Id: PR-5955
proc_lib:start*/*
has become synchronous when the started process fails. This requires that a failing process use a new functionproc_lib:init_fail/2,3
, or exits, to indicate failure. All OTP behaviours have been fixed to do this.All these start functions now consume the
'EXIT'
message from a process link for all error returns. Previously it was only thestart_link/*
functions that did this, and only when the started function exited, not when it usedinit_ack/1,2
orinit_fail/2,3
to create the return value.* POTENTIAL INCOMPATIBILITY *
Own Id: OTP-18471 Aux Id: GH-6339, PR-6843
Fixed a bug where
file:read(standard_io, ...)
unexpectedly returnedeof
in binary mode.Own Id: OTP-18486 Aux Id: PR-6881
Return type for
seq_trace:get_token/1
fixed.Own Id: OTP-18528 Aux Id: PR-7009
Looking up, connecting to and sending to a host with an empty name is now handled by trying to look up the address of the root domain, which fails. Previously some of these operations caused an internal exception, which contradicted type specifications.
Own Id: OTP-18543 Aux Id: GH-6353
Replaced a regex with a special case handling of ANSI Select Graphic Rendition escape characters, to speed up io output that make use of these escape sequences.
Own Id: OTP-18547 Aux Id: PR-7092
Improvements and New Features
The Erlang shell has been improved to support the following features:
- Auto-complete variables, record names, record field names, map keys, function parameter types and filenames.
- Open external editor in the shell (with C-o) to edit the current expression in an editor.
- Support defining records (with types), functions and function typespecs, and custom types in the shell.
- Do not save pager commands, and input to io:getline in history.
Own Id: OTP-14835 Aux Id: PR-5924
The TTY/terminal subsystem has been rewritten by moving more code to Erlang from the old linked-in driver and implementing all the I/O primitives needed in a NIF instead.
On Unix platforms the user should not notice a lot of difference, besides better handling of unicode characters and fixing of some long standing bugs.
Windows users will notice that erl.exe has the same functionality as a normal Unix shell and that werl.exe has been removed and replaced with a symlink to erl.exe. This makes the Windows Erlang terminal experience identical to that of Unix.
The re-write brings with it a number of bug fixes and feature additions:
- The TTY is now reset when Erlang exits, fixing zsh to not break when terminating an Erlang session.
standard_error
now uses the same unicode mode asstandard_io
.- Hitting backspace when searching the shell history with an empty search string no longer breaks the shell.
- Tab expansion now works on remote nodes started using the JCL interface.
- It is now possible to configure the shell slogan and the session slogans (that is the texts that appear when you start an Erlang shell). See the kernel documentation for more details.
- Added shell:start_interactive for starting the interactive shell from a non-interactive Erlang session (for example an escript).
- On Windows, when starting in detached mode the standard handler are now set
to
nul
devices instead of being unset. - Standard I/O now always defaults to
unicode
mode if supported. Previously the default waslatin1
if the runtime system had been started with-oldshell
or-noshell
(for example in anescript
). To send raw bytes over standard out, one now explicitly has to specifyio:setopts(standard_io, [{encoding, latin1}]).
* POTENTIAL INCOMPATIBILITY *
Own Id: OTP-17932 Aux Id: PR-6144 GH-3150 GH-3390 GH-4343 GH-4225
Add support for socket on Windows.
- Pre release status.
- Error codes not finalized.
- No explicit support for Windows specific options (socket options, flags for read and write).
- New async api for Windows (completion). See the
Asynchronous calls
chapter in the (Socket Usage) Users Guide. - To ensure platform independence, gentcp and gen_udp is _intended to be used (not yet updated).
Own Id: OTP-18029
As announced since the release of OTP 24, support for:
- version 4 node container types in the external term format are now
mandatory. That is, references supporting up to 5 32-bit integer
identifiers, and process and port identifiers with support for 64-bit data
storage. The distribution flag
DFLAG_V4_NC
is therefor now also mandatory. OTP has since OTP 24 supported this. Also note that the external format produced byterm_to_binary()
andterm_to_iovec()
will unconditionally produce pids, ports, and references supporting this larger format. - the new link protocol
introduced in OTP 23.3 is now mandatory. The distribution flag
DFLAG_UNLINK_ID
is therefor now also mandatory.
Due to the above, OTP 26 nodes will refuse to connect to OTP nodes from releases prior to OTP 24.
* POTENTIAL INCOMPATIBILITY *
Own Id: OTP-18140 Aux Id: PR-6072
- version 4 node container types in the external term format are now
mandatory. That is, references supporting up to 5 32-bit integer
identifiers, and process and port identifiers with support for 64-bit data
storage. The distribution flag
Support for Kernel TLS (kTLS), has been added to the SSL application, for TLS distribution (
-proto_dist inet_tls
), the SSL option{ktls, true}
. Using this for general SSL sockets is uncomfortable, undocumented and not recommended since it requires very platform dependent raw options.This, for now, only works for some not too old Linux distributions. Roughly, a kernel 5.2.0 or later with support for UserLand Protocols and the kernel module
tls
is required.Own Id: OTP-18235 Aux Id: PR-6104, PR-5840
Add code:get_doc/2 which adds support to fetch documentation skeletons of functions using debug_info chunks instead of eep48 doc chunks.
Own Id: OTP-18261 Aux Id: PR-5924
The Erlang shell's auto-completion when typing
tab
has been changed to happen after the editing current line instead of before it.This behaviour can be configured using a the
shell_expand_location
STDLIB configuration parameter.Own Id: OTP-18278 Aux Id: PR-6260
Typing
Ctrl+L
in a shell now clears the screen and redraws the current line instead of only redrawing the current line. To only redraw the current line, you must now typeAlt+L
. This brings the behaviour ofCtrl+L
closer to how bash and other shells work.* POTENTIAL INCOMPATIBILITY *
Own Id: OTP-18285 Aux Id: PR-6262
gen_server optimized by caching callback functions
Own Id: OTP-18305 Aux Id: PR-5831
Prepare the
pg
communication protocol for upgrade. The plan is for OTP-28 nodes to be able to use an upgradedpg
protocol while still being able to talk with OTP 26 nodes.Own Id: OTP-18327 Aux Id: PR-6433
New
disk_log
log typerotate
, where the log files are compressed upon rotation.Own Id: OTP-18331 Aux Id: ERIERL-870
The following
inet:setopts/2
options have been introduced:reuseport
- Reuse of local port. Load balancing may or may not be provided depending on underlying OS.reuseport_lb
- Reuse of local port. Load balancing provided.exclusiveaddruse
- Exclusive address/port usage on Windows. This socket option is Windows specific and will silently be ignored on other systems.
The behavior of setting
reuseaddr
on Windows have changed in a backwards incompatible way. The underlyingSO_REUSEADDR
socket option is now only set if both thereusaddr
and thereuseport
inet
options have been set. This since the underlyingSO_REUSEADDR
socket option on Windows behaves similar to how BSD behaves if both the underlying socket optionsSO_REUSEADDR
andSO_REUSEPORT
have been set. See the documentation of thereuseaddr
option for more information.* POTENTIAL INCOMPATIBILITY *
Own Id: OTP-18344 Aux Id: PR-6522, PR-6944, OTP-18324, PR-6481, GH-6461
Replace size/1 with either tuple_size/1 or byte_size/1
The
size/1
BIF is not optimized by the JIT, and its use can result in worse types for Dialyzer.When one knows that the value being tested must be a tuple,
tuple_size/1
should always be preferred.When one knows that the value being tested must be a binary,
byte_size/1
should be preferred. However,byte_size/1
also accepts a bitstring (rounding up size to a whole number of bytes), so one must make sure that the call tobyte_size/
is preceded by a call tois_binary/1
to ensure that bitstrings are rejected. Note that the compiler removes redundant calls tois_binary/1
, so if one is not sure whether previous code had made sure that the argument is a binary, it does not harm to add anis_binary/1
test immediately before the call tobyte_size/1
.Own Id: OTP-18405 Aux Id: GH-6672,PR-6702,PR-6768,PR-6700,PR-6769,PR-6812,PR-6814
The function
file:pid2name/1
is deprecated and will be removed in Erlang/OTP 27.Own Id: OTP-18419
The modules Erlang DNS resolver
inet_res
and helper modules have been updated for RFC6891; to handle OPT RR with DNSSEC OK (DO) bit.Own Id: OTP-18442 Aux Id: PR-6786, GH-6606
Introduced
application:get_supervisor/1
.Own Id: OTP-18444 Aux Id: PR-6035
Handling of
on_load
modules during boot has been improved by adding an extra step in the boot order for embedded mode that runs allon_load
handlers, instead of relying on explicit invocation of them, later, when the kernel supervision tree starts.This is mostly a code improvement and OTP internal simplification to avoid future bugs and to simplify code maintenance.
Own Id: OTP-18447
Reduce contention on the code_server by doing the code preparation on the client.
Own Id: OTP-18448 Aux Id: PR-6736
Added a mode to ensure_all_loaded, to start children application and their dependencies concurrently.
Own Id: OTP-18451 Aux Id: PR-6737
Cache OTP boot code paths, to limit how many folders that are being accessed during a module lookup. Can be disabled with -cache_boot_path false. OTP boot code paths consists of ERL_LIB environment variables. The various otp/*/ebin folders. And the {path, ...} clauses in the init script.
Own Id: OTP-18452 Aux Id: PR-6729
Erlang distribution code in Kernel and SSL has been refactored a bit to facilitate debugging and re-usability, which shouldn't have any noticeable effects on behaviour or performance.
Own Id: OTP-18456
Add cache attribute to code path apis.
Added an optional cache/nocache argument to all code:add_path, code:set_path, and code:replace_path* functions. These functions will then avoid doing file-accesses if they are cached. Cache can be cleared with code:clear_cache/0. Added code:del_paths/1 to make it easier to clear multiple paths.
Own Id: OTP-18466 Aux Id: PR-6832
Deprecates
dbg:stop_clear/0
because it is simply a function alias todbg:stop/0
Own Id: OTP-18478 Aux Id: GH-6903
Improvements to code:ensure_modules_loaded/1: Previously it would prepare modules and then abandon references to said modules if they had on_load callbacks. This pull request makes it so they keep the references around and then serially load them without having to fetch the object code and prepare them again.
Own Id: OTP-18484 Aux Id: PR-6844
The internal DNS resolver has been updated to handle DNS LOC RR:s (RFC 1876). This is an undocumented module, although still used by power users. See the source code.
Own Id: OTP-18510 Aux Id: GH-6098, PR-6982
Reduced memory consumption in
global
when informing other nodes about lost connections.Own Id: OTP-18521 Aux Id: PR-7025
The
net_kernel
,global
, andglobal_group
servers now have fully asynchronous distributed signaling enabled all the time which prevents them from ever getting blocked on send of distributed signals.Documentation about blocking distributed signals has also been improved.
Own Id: OTP-18533 Aux Id: PR-7061
Allow IPv6 addresses as host in
http
packets decoded byerlang:decode_packet/3
andgen_tcp
packet option. The IPv6 address should be enclosed within[]
according to RFC2732.Own Id: OTP-18540 Aux Id: PR-6900
Remove deprecated functions in OTP-26
Own Id: OTP-18542
Removed
code:is_module_native/1
since HiPE has been removed. It has since OTP 24 been deprecated and scheduled for removal in OTP 26.Removed
code:rehash/0
since the code path feature no longer is present. It has since OTP 19 been deprecated and has since OTP 24 been scheduled for removal in OTP 26.* POTENTIAL INCOMPATIBILITY *
Own Id: OTP-18551 Aux Id: PR-7106
Added support for multiple line expressions and navigation in the shell. Added new keybindings:
- navigate up (ctrl+up)/(alt+up)
- navigate down (ctrl+down)/(alt+down)
- insert newline in middle of line (alt+enter)
- navigate top (alt+<)/(alt+shift+up)
- navigate bottom (alt+>)/(alt+shift+down)
- clear current expression (alt+c)
- cancel search (alt+c)
- opening editor on mac (option+o)/(alt+o)
Modifies the prompt for new lines to make it clearer that the prompt has entered multi-line mode. Supports terminal with small window size, recommend not go lower than 7 rows and 40 columns. Modifies the search prompt to support multi-line statements. Redraw the prompt after continuing from JCL menu.
Own Id: OTP-18575 Aux Id: PR-7169
Kernel 8.5.4.3
Fixed Bugs and Malfunctions
Fixed gen_udp:open/2 type spec to include already supported module socket address types.
Own Id: OTP-19050 Aux Id: OTP-18990
Kernel 8.5.4.2
Fixed Bugs and Malfunctions
gen_tcp:connect with socket address and socket (inet-) backend fails because of missing callback function.
Own Id: OTP-18707 Aux Id: #7530
Kernel 8.5.4.1
Fixed Bugs and Malfunctions
Multiple socket:accept calls issue. When making multiple accept calls, only the last call is active.
Own Id: OTP-18635 Aux Id: #7328
gen_udp:connect with inet_backend = socket fails when the Address is a hostname (string or atom).
Own Id: OTP-18650
Kernel 8.5.4
Fixed Bugs and Malfunctions
Fixed a bug on Windows where
file:read_file_info/1
would fail for files with corrupt metadata.Own Id: OTP-18348 Aux Id: GH-6356
Accept connection setup from OTP 23 and 24 nodes that are not using epmd.
Own Id: OTP-18404 Aux Id: GH-6595, PR-6625
Kernel 8.5.3
Fixed Bugs and Malfunctions
The tcp connect option 'bind_to_device' could not be used with inet_backend = 'socket'. 'inet' requires value type binarry() and 'socket' requires value type 'string()'.
Own Id: OTP-18357 Aux Id: #6509
Minor issue processing options when calling gen_tcp:connect with a sockaddr() and inet_backend = socket.
Own Id: OTP-18358 Aux Id: #6528
Kernel 8.5.2
Fixed Bugs and Malfunctions
Fixed shutdown crash in gen_tcp socket backend, when the other end closed the socket.
Own Id: OTP-18270 Aux Id: #6331
erl_tar
can now read gzip-compressed tar files that are padded. There is a new optioncompressed_one
forfile:open/2
that will read a single member from a gzip file,Own Id: OTP-18289 Aux Id: PR-6343
Fix
os:cmd
to not translate all exceptions thrown tobadarg
. For exampleemfile
fromerlang:open_port
was translated tobadarg
.This bug has existed since Erlang/OTP 24.
Own Id: OTP-18291 Aux Id: PR-6382
Spec for function net:if_names/0 incorrect
Own Id: OTP-18296 Aux Id: OTP-16464
Missing ctrl option name transation for TOS and TTL (on FreeBSD) when using gen_udp with the 'socket' inet_backend.
Own Id: OTP-18315
gen_udp:open/2 with option(s) add_membership or drop_membership would drop earlier options.
Own Id: OTP-18323 Aux Id: #6476
The
inet:setopts/2
{reuseaddr, true}
option will now be ignored on Windows unless the socket is an UDP socket. For more information see the documentation of thereuseaddr
option part of the documentation ofinet:setopts/2
.Prior to OTP 25 the
{reuseaddr, true}
option was ignored for all sockets on Windows, but as of OTP 25.0 this was changed so that it was not ignored for any sockets.* POTENTIAL INCOMPATIBILITY *
Own Id: OTP-18324 Aux Id: GH-6461, PR-6481
Improvements and New Features
The distribution socket option handling in
inet_tcp_dist
has been cleaned up to clarify which were mandatory and which just had default values.Own Id: OTP-18293
Improve warning message format for gen_tcp_socket.
Own Id: OTP-18317
Kernel 8.5.1
Fixed Bugs and Malfunctions
Listen sockets created with the socket module, leaked (erlang-) monitors.
Own Id: OTP-18240 Aux Id: #6285
peer
nodes failed to halt when the process supervising the control connection crashed. When an alternative control connection was used, this supervision process also quite frequently crashed when thepeer
node was stopped by the node that started it which caused thepeer
node to linger without ever halting.Own Id: OTP-18249 Aux Id: PR-6301
Kernel 8.5
Fixed Bugs and Malfunctions
Fixed inconsistency bugs in
global
due tonodeup
/nodedown
messages not being delivered before/after traffic over connections. Also fixed various other inconsistency bugs and deadlocks in bothglobal_group
andglobal
.As building blocks for these fixes, a new BIF
erlang:nodes/2
has been introduced andnet_kernel:monitor_nodes/2
has been extended.The
-hidden
and-connect_all
command line arguments did not work if multiple instances were present on the command line which has been fixed. The new kernel parameterconnect_all
has also been introduced in order to replace the-connect_all
command line argument.Own Id: OTP-17934 Aux Id: PR-6007
Fixed IPv6 multicast_if and membership socket options.
Own Id: OTP-18091 Aux Id: #5789
Fixed issue with inet:getifaddrs hanging on pure IPv6 Windows
Own Id: OTP-18102 Aux Id: #5904
The type specifications for
inet:getopts/2
andinet:setopts/2
have been corrected regarding SCTP options.Own Id: OTP-18115 Aux Id: PR-5939
The type specifications for
inet:parse_*
have been tightened.Own Id: OTP-18121 Aux Id: PR-5972
Fix gen_tcp:connect/3 spec to include the inet_backend option.
Own Id: OTP-18171 Aux Id: PR-6131
Fix bug where using a binary as the format when calling
logger:log(Level, Format, Args)
(or any other logging function) would cause a crash or incorrect logging.Own Id: OTP-18229 Aux Id: PR-6212
Improvements and New Features
Add rudimentary debug feature (option) for the inet-driver based sockets, such as gen_tcp and gen_udp.
Own Id: OTP-18032
Introduced the
hidden
anddist_listen
options tonet_kernel:start/2
.Also documented the
-dist_listen
command line argument which was erroneously documented as akernel
parameter and not as a command line argument.Own Id: OTP-18107 Aux Id: PR-6009
Scope and group monitoring have been introduced in
pg
. For more information see the documentation ofpg:monitor_scope()
,pg:monitor()
, andpg:demonitor()
.Own Id: OTP-18163 Aux Id: PR-6058, PR-6275
A new function
global:disconnect/0
has been introduced with which one can cleanly disconnect a node from all other nodes in a cluster ofglobal
nodes.Own Id: OTP-18232 Aux Id: OTP-17843, PR-6264
Kernel 8.4.2
Fixed Bugs and Malfunctions
A call to
net_kernel:setopts(new, Opts)
at the same time as a connection was being set up could cause a deadlock between thenet_kernel
process and the process setting up the connection.Own Id: OTP-18198 Aux Id: GH-6129, PR-6216
Kernel 8.4.1
Fixed Bugs and Malfunctions
The DNS resolver
inet_res
has been fixed to ignore trailing dot difference in the request domain between the sent request and the received response, when validating a response.Own Id: OTP-18112 Aux Id: ERIERL-811
A bug in
inet_res
has been fixed where a missing internal{ok,_}
wrapper causedinet_res:resolve/*
to return a calculated host name instead of an{ok,Msg}
tuple, when resolving an IP address or a host name that is an IP address string.Own Id: OTP-18122 Aux Id: GH-6015, PR-6020
The
erlang:is_alive()
BIF could returntrue
before configured distribution service was available. This bug was introduced in OTP 25.0 ERTS version 13.0.The
erlang:monitor_node()
anderlang:monitor()
BIFs could erroneously fail even though configured distribution service was available. This occurred if these BIFs were called after the distribution had been started using dynamic node name assignment but before the name had been assigned.Own Id: OTP-18124 Aux Id: OTP-17558, PR-6032
Added the missing mandatory
address/0
callback in thegen_tcp_dist
example.Own Id: OTP-18136
Kernel 8.4
Fixed Bugs and Malfunctions
The DNS resolver implementation has been rewritten to validate replies more thoroughly, and a bit optimized to create less garbage.
Own Id: OTP-17323
The socket option 'reuseaddr' is no longer ignored on Windows.
Own Id: OTP-17447 Aux Id: GH-4819
Fix bug where using the atoms
string
orreport
as the format when callinglogger:log(Level, Format, Args)
(or any other logging function) would cause a crash or incorrect logging.Own Id: OTP-17551 Aux Id: GH-5071 PR-5075
As of OTP 25,
global
will by default prevent overlapping partitions due to network issues by actively disconnecting from nodes that reports that they have lost connections to other nodes. This will cause fully connected partitions to form instead of leaving the network in a state with overlapping partitions.Prevention of overlapping partitions can be disabled using the
prevent_overlapping_partitions
kernel(6)
parameter, makingglobal
behave like it used to do. This is, however, problematic for all applications expecting a fully connected network to be provided, such as for examplemnesia
, but also forglobal
itself. A network of overlapping partitions might cause the internal state ofglobal
to become inconsistent. Such an inconsistency can remain even after such partitions have been brought together to form a fully connected network again. The effect on other applications that expects that a fully connected network is maintained may vary, but they might misbehave in very subtle hard to detect ways during such a partitioning. Since you might get hard to detect issues without this fix, you are strongly advised not to disable this fix. Also note that this fix has to be enabled on all nodes in the network in order to work properly.* POTENTIAL INCOMPATIBILITY *
Own Id: OTP-17911 Aux Id: PR-5687, PR-5611, OTP-17843
Starting the helper program for name resolving;
inet_gethost
, has been improved to use an absolute file system path to ensure that the right program is started.If the helper program can not be started - the system now halts, to avoid running with a silently broken name resolver.
Own Id: OTP-17958 Aux Id: OTP-17978
The type specification for
inet_res:getbyname/2,3
has been corrected to reflect that it can return peculiar#hostent{}
records.Own Id: OTP-17986 Aux Id: PR-5412, PR-5803
code:module_status/1
would always report BEAM files loaded from an archive asmodified
, andcode:modified_modules/0
would always return the name of all modules loaded from archives.Own Id: OTP-17990 Aux Id: GH-5801
In logger fix file handler shutdown delay by using erlang timers instead of the timer module's timers.
Own Id: OTP-18001 Aux Id: GH-5780 PR-5829
Fix the meta data in log events generated by logger on failure to not contain the original log event's meta data.
Own Id: OTP-18003 Aux Id: PR-5771
Fix logger file backend to re-create the log folder if it has been deleted.
Own Id: OTP-18015 Aux Id: GH-5828 PR-5845
[socket] Encode of sockaddr has been improved.
Own Id: OTP-18020
Fix
put_chars
requests to the io server with incomplete unicode data to exit withno_translation
error.Own Id: OTP-18070 Aux Id: PR-5885
Improvements and New Features
The net module now works on Windows.
Own Id: OTP-16464
An Erlang installation directory is now relocatable on the file system given that the paths in the installation's
RELEASES
file are paths that are relative to the installations root directory. The`release_handler:create_RELEASES/4
function can generate aRELEASES
file with relative paths if itsRootDir
parameter is set to the empty string.Own Id: OTP-17304
The following distribution flags are now mandatory:
DFLAG_BIT_BINARIES
,DFLAG_EXPORT_PTR_TAG
,DFLAG_MAP_TAGS
,DFLAG_NEW_FLOATS
, andDFLAG_FUN_TAGS
. This mainly concerns libraries or application that implement the distribution protocol themselves.Own Id: OTP-17318 Aux Id: PR-4972
Fix
os:cmd
to work on Android OS.Own Id: OTP-17479 Aux Id: PR-4917
The configuration files
.erlang
,.erlang.cookie
and.erlang.crypt
can now be located in the XDG Config Home directory.See the documentation for each file and
filename:basedir/2
for more details.Own Id: OTP-17554 Aux Id: GH-5016 PR-5408 OTP-17821
Dynamic node name improvements:
erlang:is_alive/0
changed to return true for pending dynamic node name and new functionnet_kernel:get_state/0
.Own Id: OTP-17558 Aux Id: OTP-17538, PR-5111, GH-5402
The types for callback result types in
gen_statem
has bee augmented with arity 2 types where it is possible for a callback module to specify the type of the callback data, so the callback module can get type validation of it.Own Id: OTP-17589 Aux Id: PR-4926
The tagged tuple tests and fun-calls have been optimized and are now a little bit cheaper than previously.
These optimizations become possible after making sure that all boxed terms have at least one word allocated after the arity word. This has been accomplished by letting all empty tuples refer to the same empty tuple literal which also reduces memory usage for empty tuples.
Own Id: OTP-17608
A
net_ticker_spawn_options
kernel
configuration parameter with which one can set spawn options for the distribution channel ticker processes has been introduced.Own Id: OTP-17617 Aux Id: PR-5069
The most, or at least the most used,
rpc
operations now requireerpc
support in order to communicate with other Erlang nodes.erpc
was introduced in OTP 23. That is,rpc
operations against Erlang nodes of releases prior to OTP 23 will fail.* POTENTIAL INCOMPATIBILITY *
Own Id: OTP-17681 Aux Id: PR-5307
The new module
peer
supersedes theslave
module. Theslave
module is now deprecated and will be removed in OTP 27.peer
contains an extended and more robust API for starting erlang nodes.Own Id: OTP-17720 Aux Id: PR-5162
In order to make it easier for the user to manage multiple outstanding asynchronous
call
requests, new functionality utilizing request identifier collections have been introduced inerpc
,gen_server
,gen_statem
, andgen_event
.Own Id: OTP-17784 Aux Id: PR-5792
Type specifications have been added to the
gen_server
, and the documentation has been updated to utilize this.This surfaced a few type violations that has been corrected in
global
,logger_olp
andrpc
.Own Id: OTP-17915 Aux Id: PR-5751, GH-2375, GH-2690
IP address validation functions
is_ipv4_address/1
,is_ipv6_address/1
andis_ip_address/1
have been added to the moduleinet
in Kernel.Own Id: OTP-17923 Aux Id: PR-5646
An API for multihomed SCTP connect has been added in the guise of
gen_sctp:connectx_init/*
Own Id: OTP-17951 Aux Id: PR-5656
[socket] Add encoding of the field hatype of the type sockaddr_ll (family 'packet').
Own Id: OTP-17968 Aux Id: OTP-16464
Added support for configurable features as described in EEP-60. Features can be enabled/disabled during compilation with options (
-enable-feature Feature
,-disable-feature Feature
and+{feature, Feature, enable|disable}
) toerlc
as well as with directives (-feature(Feature, enable|disable).
) in the file. Similar options can be used toerl
for enabling/disabling features allowed at runtime. The newmaybe
expression (EEP-49) is fully supported as the featuremaybe_expr
. The features support is documented in the reference manual.Own Id: OTP-17988
Kernel 8.3.2.4
Fixed Bugs and Malfunctions
gen_tcp:connect with socket address and socket (inet-) backend fails because of missing callback function.
Own Id: OTP-18707 Aux Id: #7530
Kernel 8.3.2.3
Fixed Bugs and Malfunctions
Spec for function net:if_names/0 incorrect
Own Id: OTP-18296 Aux Id: OTP-16464
Missing ctrl option name transation for TOS and TTL (on FreeBSD) when using gen_udp with the 'socket' inet_backend.
Own Id: OTP-18315
The tcp connect option 'bind_to_device' could not be used with inet_backend = 'socket'. 'inet' requires value type binarry() and 'socket' requires value type 'string()'.
Own Id: OTP-18357 Aux Id: #6509
Minor issue processing options when calling gen_tcp:connect with a sockaddr() and inet_backend = socket.
Own Id: OTP-18358 Aux Id: #6528
Improvements and New Features
Improve warning message format for gen_tcp_socket.
Own Id: OTP-18317
Kernel 8.3.2.2
Improvements and New Features
A new function
global:disconnect/0
has been introduced with which one can cleanly disconnect a node from all other nodes in a cluster ofglobal
nodes.Own Id: OTP-18232 Aux Id: OTP-17843, PR-6264
Kernel 8.3.2.1
Fixed Bugs and Malfunctions
A call to
net_kernel:setopts(new, Opts)
at the same time as a connection was being set up could cause a deadlock between thenet_kernel
process and the process setting up the connection.Own Id: OTP-18198 Aux Id: GH-6129, PR-6216
Kernel 8.3.2
Fixed Bugs and Malfunctions
inet:getopts/2 for the 'raw' option for a socket created with inet-backend 'socket' failed.
Own Id: OTP-18078 Aux Id: GH-5930
Corrected the behaviour of the shutdown function when using with the inet_backend = socket. It was not sufficiently compatible with the "old" gen_tcp.
Own Id: OTP-18080 Aux Id: GH-5930
Kernel 8.3.1
Fixed Bugs and Malfunctions
Fix failed accepted connection setup after previous established connection from same node closed down silently.
Own Id: OTP-17979 Aux Id: ERIERL-780
Fixed a problem where typing Ctrl-R in the shell could hang if there were some problem with the history log file.
Own Id: OTP-17981 Aux Id: PR-5791
Kernel 8.3
Fixed Bugs and Malfunctions
Handling of
send_timeout
forgen_tcp
has been corrected so that the timeout is honored also when sending 0 bytes.Own Id: OTP-17840
By default
global
does not take any actions to restore a fully connected network when connections are lost due to network issues. This is problematic for all applications expecting a fully connected network to be provided, such as for examplemnesia
, but also forglobal
itself. A network of overlapping partitions might cause the internal state ofglobal
to become inconsistent. Such an inconsistency can remain even after such partitions have been brought together to form a fully connected network again. The effect on other applications that expects that a fully connected network is maintained may vary, but they might misbehave in very subtle hard to detect ways during such a partitioning.In order to prevent such issues, we have introduced a prevent overlapping partitions fix which can be enabled using the
prevent_overlapping_partitions
kernel(6)
parameter. When this fix has been enabled,global
will actively disconnect from nodes that reports that they have lost connections to other nodes. This will cause fully connected partitions to form instead of leaving the network in a state with overlapping partitions. Note that this fix has to be enabled on all nodes in the network in order to work properly. Since this quite substantially changes the behavior, this fix is currently disabled by default. Since you might get hard to detect issues without this fix you are, however, strongly advised to enable this fix in order to avoid issues such as the ones described above. As of OTP 25 this fix will become enabled by default.Own Id: OTP-17843 Aux Id: ERIERL-732, PR-5611
Fix bug where
logger
would crash when logging a report including improper lists.Own Id: OTP-17851
Make
erlang:set_cookie
work for dynamic node names.Own Id: OTP-17902 Aux Id: GH-5402, PR-5670
Improvements and New Features
Add support for using socket:sockaddr_in() and socket:sockaddr_in6() when using gen_sctp, gen_tcp and gen_udp. This will make it possible to use Link Local IPv6 addresses.
Own Id: OTP-17455 Aux Id: GH-4852
A
net_tickintensity
kernel
parameter has been introduced. It can be used to control the amount of ticks during anet_ticktime
period.A new
net_kernel:start/2
function has also been introduced in order to make it easier to add new options. The use ofnet_kernel:start/1
has been deprecated.Own Id: OTP-17905 Aux Id: ERIERL-732, PR-5740
Improve documentation for the dynamic node name feature.
Own Id: OTP-17918
Kernel 8.2
Fixed Bugs and Malfunctions
socket:which_sockets( pid() ) uses wrong keyword when looking up socket owner ('ctrl' instead of 'owner').
Own Id: OTP-17716
In epmd_ntop, the #if defined(EPMD6) conditional was inverted and it was only including the IPv6-specific code when EPMD6 was undefined. This was causing IPv6 addrs to be interpreted as IPv4 addrs and generating nonsense IPv4 addresses as output.
Several places were incorrectly using 'num_sockets' instead of 'i' to index into the iserv_addr array during error logging. This would result in a read into uninitialized data in the iserv_addr array.
Thanks to John Eckersberg for providing this fix.
Own Id: OTP-17730
Minor fix of the
erl_uds_dist
distribution module example.Own Id: OTP-17765 Aux Id: PR-5289
A bug has been fixed for the legacy TCP socket adaption module
gen_tcp_socket
where it did bind to a socket address when given a file descriptor, but should not.Own Id: OTP-17793 Aux Id: PR-5348, OTP-17451, PR-4787, GH-4680, PR-2989, OTP-17216
Improve the error printout when
open_port/2
fails because of invalid arguments.Own Id: OTP-17805 Aux Id: PR-5406
Calling socket:monitor/1 on an already closed socket should succeed and result in an immediate DOWN message. This has now been fixed.
Own Id: OTP-17806
Fix the configuration option
logger_metadata
to work.Own Id: OTP-17807 Aux Id: PR-5418
Fix tls and non-tls distribution to use erl_epmd:address_please to figure out if IPv4 or IPv6 addresses should be used when connecting to the remote node.
Before this fix, a dns lookup of the remote node hostname determined which IP version was to be used which meant that the hostname had to resolve to a valid ip address.
Own Id: OTP-17809 Aux Id: PR-5337 GH-5334
Improvements and New Features
Add
logger:reconfigure/0
.Own Id: OTP-17375 Aux Id: PR-4663 PR-5186
Add socket function ioctl/2,3,4 for socket device control.
Own Id: OTP-17528
Add simple support for socknames/1 for gen_tcp_socket and gen_udp_socket.
Own Id: OTP-17531
The types for callback result types in
gen_statem
has bee augmented with arity 2 types where it is possible for a callback module to specify the type of the callback data, so the callback module can get type validation of it.Own Id: OTP-17738 Aux Id: PR-4926, OTP-17589
Kernel 8.1.3
Fixed Bugs and Malfunctions
The internal, undocumented, but used, module
inet_dns
has been fixed to handle mDNS high bit usage of the Class field.Code that uses the previously obsolete, undocumented and unused record field
#dns_rr.func
will need to be updated since that field is now used as a boolean flag for the mDNS high Class bit. Code that uses the also undocumented record#dns_query
will need to be recompiled since a boolean field#dns_query.unicast_response
has been added for the mDNS high Class bit.* POTENTIAL INCOMPATIBILITY *
Own Id: OTP-17734 Aux Id: GH-5327, OTP-17659
The fix for Linux's behaviour when reconnecting an UDP socket in PR-5120 released in OTP-24.1.2 has been refined to only dissolve the socket's connection before a connect if the socket is already connected, that is: only for a reconnect.
This allows code to open a socket with an ephemeral port, get the port number and connect; without the port number changing (on Linux). This turned out to have at least one valid use case (besides test cases).
Should one reconnect the socket then the port number may change, on Linux; it is a known quirk, which can be worked around by binding to a specific port number when opening the socket. If you can do without an ephemeral port, that is...
Own Id: OTP-17736 Aux Id: GH-5279, PR-5120, OTP-17559
Kernel 8.1.2
Fixed Bugs and Malfunctions
The undocumented DNS encode/decode module
inet_dns
has been cleaned up to handle the difference between "symbolic" and "raw" records in a more consistent manner.PR-5145/OTP-17584 introduced a change that contributed to an already existing confusion, which this correction should remedy.
Own Id: OTP-17659 Aux Id: ERIERL-702
Kernel 8.1.1
Fixed Bugs and Malfunctions
Add more info about the socket 'type' ('socket' or 'port') for the DOWN message when monitoring sockets.
Own Id: OTP-17640
Kernel 8.1
Fixed Bugs and Malfunctions
The extended error information has been corrected and improved for the following BIFs:
binary_to_existing_atom/2
,list_to_existing_atom/1
,erlang:send_after/{3,4}
, anderlang:start_timer/{3,4}
.Own Id: OTP-17449 Aux Id: GH-4900
Fixed rare bug that could cause net_kernel process to hang for ever. Have seen to happen with massive number of TLS connections while remote nodes are restarting. Bug exists since OTP-22.0.
Own Id: OTP-17476 Aux Id: GH-4931, PR-4934
Improve handling of closed sockets for inet:info/1.
Own Id: OTP-17492
This change fixes a performance problem introduced in pull-request #2675. Pull-request #2675 made so the system tried to start children of already started applications which is unnecessary. This change fixes this performance problem.
Own Id: OTP-17519
Fix code:get_doc/1 to not crash when module is located in an escript.
Own Id: OTP-17570 Aux Id: PR-5139 GH-4256 ERL-1261
Parsing of the result value in the native DNS resolver has been made more defensive against incorrect results.
Own Id: OTP-17578 Aux Id: ERIERL-683
A bug in the option handling for the legacy socket adaptor, that is; when using
inet_backend = socket
, has been fixed. Now socket options are set before the bind() call so options regarding, for example address reuse have the desired effect.Own Id: OTP-17580 Aux Id: GH-5122
inet:ntoa/1
has been fixed to not accept invalid numerical addresses.Own Id: OTP-17583 Aux Id: GH-5136
Parsing of DNS records has been improved for records of known types to not accept and present malformed ones in raw format.
Own Id: OTP-17584 Aux Id: PR-5145
The
ip_mreq()
type for the{ip,add_membership}
and{ip,drop_membership}
socket options has been corrected to have aninterface
field instead of, incorrectly, anaddress
field.Own Id: OTP-17590 Aux Id: PR-5170
Improvements and New Features
Add simple utility function to display existing sockets i the erlang shell (socket:i/0).
Own Id: OTP-17376 Aux Id: OTP-17157
gen_udp can now be configured to use the socket inet-backend (in the same way as gen_tcp).
Own Id: OTP-17410
Functions
erlang:set_cookie(Cookie)
anderlang:get_cookie(Node)
have been added for completeness and to facilitate configuring distributed nodes with different cookies.The documentation regarding distribution cookies has been improved to be less vague.
Own Id: OTP-17538 Aux Id: GH-5063, PR-5111
A workaround has been implemented for Linux's quirky behaviour to not adjust the source IP address when connecting a connected (reconnecing) UDP socket.
The workaround is to, on Linux, always dissolve any connection before connecting an UDP socket.
Own Id: OTP-17559 Aux Id: GH-5092, PR-5120
Documented our recommendation against opening NFS-mounted files, FIFOs, devices, and similar using
file:open/2
.Own Id: OTP-17576 Aux Id: ERIERL-685
Kernel 8.0.2
Fixed Bugs and Malfunctions
For
gen_tcp:connect/3,4
it is possible to specify a specific source port, which should be enough to bind the socket to an address with that port before connecting.Unfortunately that feature was lost in OTP-17216 that made it mandatory to specify the source address to get an address binding, and ignored a specified source port if no source address was specified.
That bug has now been corrected.
Own Id: OTP-17536 Aux Id: OTP-17216, ERIERL-677
Kernel 8.0.1
Fixed Bugs and Malfunctions
Fix a race condition in Global.
Own Id: OTP-16033 Aux Id: ERIERL-329, ERL-1414, GH-4448, ERL-885, GH-3923
After a node restart with
init:restart/0,1
, the modulesocket
was not usable because supporting tables had been cleared and not re-initialized. This has now been fixed.Handling of the "." domain as a search domain was incorrect and caused a crash in the DNS resolver
inet_res
, which has now been fixed.Own Id: OTP-17439 Aux Id: GH-4827, PR-4888, GH-4838
Handling of combinations of the
fd
option and binding to an address has been corrected, especially for thelocal
address family.Own Id: OTP-17451 Aux Id: OTP-17374
Bug fixes and code cleanup for the new
socket
implementation, such as:Assertions on the result of demonitoring has been added in the NIF code, where appropriate.
Internal state handling for socket close in the NIF code has been reviewed.
Looping over
close()
forEINTR
in the NIF code has been removed, since it is strongly discouraged on Linux and Posix is not clear about if it is allowed.The
inet_backend
temporary socket option for legacygen_tcp
sockets has been documented.The return value from
net:getaddrinfo/2
has been corrected: theprotocol
field is now anatom/0
, instead of, incorrectly,list(atom())
. The documentation has also been corrected about this return type.Deferred close of a
socket:sendfile/*
file was broken and has been corrected.Some debug code, not enabled by default, in the socket NIF has been corrected to not accidentally core dump for debug printouts of more or less innocent events.
Own Id: OTP-17452
Kernel 8.0
Fixed Bugs and Malfunctions
A bug has been fixed for the internal
inet_res
resolver cache that handled a resolver configuration file status timer incorrectly and caused performance problems due to many unnecessary file system accesses.Own Id: OTP-14700 Aux Id: PR-2848
Change the value of the tag
head
returned bydisk_log:info/1
from{ok, Head}
to justHead
.* POTENTIAL INCOMPATIBILITY *
Own Id: OTP-16809 Aux Id: ERL-1313
Two options have been added to
erl_call
. The-fetch_stdout
option fetches stdout data resulting from the code invoked byerl_call
. The-fetch_stdout
option disables printing of the result term. In order to implement the first of these two options a new function calledei_xrpc_from
has been added to erl_interface. For details see theerl_call
documentation anderl_interface
documentation.Own Id: OTP-17132
Missing runtime dependencies has been added to this application.
Own Id: OTP-17243 Aux Id: PR-4557
inet:get_rc/0
has been corrected to return host entries as separate entries instead of (incorrectly) in a list within the list. This bug was introduced by OTP-16487 in OTP-23.0-rc1.Own Id: OTP-17262 Aux Id: GH-4588, PR-4604, OTP-16487
The type gen_tcp:option_name() had a duplicate pktoptions value.
Own Id: OTP-17277
Fixed removal of empty groups from internal state in
pg
.Own Id: OTP-17286 Aux Id: PR-4619
erl -remsh
now prints an error message when it fails to connect to the remote node.Own Id: OTP-17287 Aux Id: PR-4581
Fix bugs related to corrupt shell history files.
Error messages printed by shell history are now logged as logger error reports instead of written to standard error.
Own Id: OTP-17288 Aux Id: PR-4581
A logger warning is now issues when too many arguments are given to
-name
or-sname
. Example:erl -name a b
.Own Id: OTP-17315 Aux Id: GH-4626
The cache used by
inet_res
now, again, can handle multiple IP addresses per domain name, and thus fixes a bug introduced in PR-3041 (OTP-13126) and PR-2891 (OTP-14485).Own Id: OTP-17344 Aux Id: PR-4633, GH-4631, OTP-14485, OTP-12136
Sockets created with socket:accept not counted (socket:info/0).
Own Id: OTP-17372
The
{fd, Fd}
option togen_tcp:listen/2
did not work forinet_backend
socket
, which has been fixed.Own Id: OTP-17374 Aux Id: PR-4787, GH-4680, PR-2989, OTP-17216
Improvements and New Features
The cache used by the DNS resolver
inet_res
has been improved to use ETS lookups instead of server calls. This is a considerable speed improvement for cache hits.Own Id: OTP-13126 Aux Id: PR-3041
The cache ETS table type for the internal DNS resolver
inet_res
has changed type (internally) to get better speed and atomicity.Own Id: OTP-14485 Aux Id: PR-2891
The experimental
socket
module can now use any protocol (by name) the OS supports. Suggested in PR-2641, implemented in PR-2670.Own Id: OTP-14601 Aux Id: PR-2641, PR-2670, OTP-16749
The DNS resolver
inet_res
has been updated to support CAA (RFC 6844) and URI (RFC 7553) records.Own Id: OTP-16517 Aux Id: PR-2827
A compatibility adaptor for
gen_tcp
to use the newsocket
API has been implemented (gen_tcp_socket
). Used when setting the kernel application variableinet_backend = socket
.Own Id: OTP-16611 Aux Id: OTP-16749
Extended error information for failing BIF calls as proposed in EEP 54 has been implemented.
When a BIF call from the Erlang shell fails, more information about which argument or arguments that were in error will be printed. The same extended error information will by
proc_lib
,common_test
, andqlc
when BIF calls fail.For applications that wish to provide the same extended error information, there are new functions
erl_error:format_exception/3
anderl_error:format_exception/4
.There is a new
error/3
BIF that allows applications or libraries to provide extended error information in the same way for their own exceptions.Own Id: OTP-16686
The file server can now be bypassed in
file:delete/1,2
with theraw
option.Own Id: OTP-16698 Aux Id: PR-2634
An example implementation of Erlang distribution over UDS using distribution processes has been introduced.
Thanks to Jérôme de Bretagne
Own Id: OTP-16703 Aux Id: PR-2620
The process alias feature as outlined by EEP 53 has been introduced. It is introduced in order to provide a lightweight mechanism that can prevent late replies after timeout or connection loss. For more information, see EEP 53 and the documentation of the new
alias/1
BIF and the new options to themonitor/3
BIF.The
call
operation in the framework used bygen_server
,gen_statem
, andgen_event
has been updated to utilize alias in order to prevent late responses. Thegen_statem
behavior still use a proxy process in the distributed case, since it has always prevented late replies and aliases won't work against pre OTP 24 nodes. The proxy process can be removed in OTP 26.The alias feature also made it possible to introduce new functions similar to the
erpc:receive_response()
function in the gen behaviors, so the new functionsgen_server:receive_response()
,gen_statem:receive_response()
,gen_event:receive_response()
have also been introduced.Own Id: OTP-16718 Aux Id: PR-2735
The experimental new socket API has been further developed. Some backwards incompatible changes with respect to OTP 23 have been made.
The control message format has been changed so a decoded value is now in the 'value' field instead of in the 'data' field. The 'data' field now always contains binary data.
Some type names have been changed regarding message headers and control message headers.
socket:bind/2
now returns plainok
instead of{ok, Port}
which was only relevant for theinet
andinet6
address families and often not interesting. To find out which port was chosen usesocket:sockname/1
.* POTENTIAL INCOMPATIBILITY *
Own Id: OTP-16749 Aux Id: OTP-14601
New function
os:env/0
returns all OS environment variables as a list of 2-tuples.Own Id: OTP-16793 Aux Id: ERL-1332, PR-2740
Remove the support for distributed disk logs. The new function
disk_log:all/0
is to be used instead ofdisk_log:accessible_logs/0
. The functiondisk_log:close/1
is to be used instead ofdisk_log:lclose/1,2
.* POTENTIAL INCOMPATIBILITY *
Own Id: OTP-16811
Expand the spec for
erl_epmd:listen_port_please/2
to mirrorerl_epmd:port_please/2
.Own Id: OTP-16947 Aux Id: PR-2781
A new erl parameter for specifying a file descriptor with configuration data has been added. This makes it possible to pass the parameter "-configfd FD" when executing the erl command. When this option is given, the system will try to read and parse configuration parameters from the file descriptor.
Own Id: OTP-16952
The experimental HiPE application has been removed, together with all related functionality in other applications.
* POTENTIAL INCOMPATIBILITY *
Own Id: OTP-16963
The
pg2
module has been removed.* POTENTIAL INCOMPATIBILITY *
Own Id: OTP-16968
Accept references up to a size of 160-bits from remote nodes. This is the first step in an upgrade path toward using references up to 160-bits in a future OTP release.
Own Id: OTP-17005 Aux Id: OTP-16718
Allow utf-8 binaries as parts of logger_formatter template.
Own Id: OTP-17015
Let
disk_log:open/1
change the size if a wrap log is opened for the first time, that is, the disk log process does not exist, and the value of optionsize
does not match the current size of the disk log.* POTENTIAL INCOMPATIBILITY *
Own Id: OTP-17062 Aux Id: ERL-1418, GH-4469, ERIERL-537
Allow the shell history of an erlang node to be fetched and stores using a custom callback module. See
shell_history
configuration parameter in the kernel documentation for more details.Own Id: OTP-17103 Aux Id: PR-2949
The simple logger (used to log events that happen before kernel has been started) has been improved to print prettier error messages.
Own Id: OTP-17106 Aux Id: PR-2885
socket:sendfile/2,3,4,5
has been implemented, for platforms that support the underlying socket library call.Own Id: OTP-17154 Aux Id: OTP-16749
Add socket monitor(s) for all types sockets.
Own Id: OTP-17155
Fix various issues with the gen_tcp_socket. Including documenting some incompatibilities.
* POTENTIAL INCOMPATIBILITY *
Own Id: OTP-17156
inet:i/0 now also shows existing gen_tcp compatibility sockets (based on 'socket').
Own Id: OTP-17157
Added support in logger for setting primary metadata. The primary metadata is passed as a base metadata to all log events in the system. See Metadata in the Logger chapter of the Kernel User's Guide for more details.
Own Id: OTP-17181 Aux Id: PR-2457
Recognize new key 'optional_applications' in application resource files.
Own Id: OTP-17189 Aux Id: PR-2675
The
Fun
's passed to logger:log/2,3,4 can now return metadata that will only be fetched when needed. Seelogger:log/2,3,4
for more details.Own Id: OTP-17198 Aux Id: PR-2721
erpc:multicall()
has been rewritten to be able to utilize the newly introduced and improved selective receive optimization.Own Id: OTP-17201 Aux Id: PR-4534
Add utility fiunction inet:info/1 to provide miscellaneous info about a socket.
Own Id: OTP-17203 Aux Id: OTP-17156
The behaviour for
gen_tcp:connect/3,4
has been changed to not per default bind to an address, which allows the network stack to delay the address and port selection to when the remote address is known. This allows better port re-use, and thus enables far more outgoing connections, since the ephemeral port range no longer has to be a hard limit.There is a theoretical possibility that this behaviour change can affect the set of possible error values, or have other small implications on some platforms.
* POTENTIAL INCOMPATIBILITY *
Own Id: OTP-17216 Aux Id: PR-2989
An option
{nxdomain_reply, boolean()}
has been implemented in the DNS resolverinet_res
. It is useful since annxdomain
error from a name server does contain the SOA record if the domain exists at all. This record is useful to determine a TTL for negative caching of the failed entry.Own Id: OTP-17266 Aux Id: PR-4564
Optimized lookup of local processes part of groups in
pg
.Own Id: OTP-17284 Aux Id: PR-4615
The return values from module
socket
functionssend()
,sendto()
,sendmsg()
,sendfile()
andrecv()
has been changed to return a tuple tagged withselect
when aSelectInfo
was returned, and not sometimes tagged withok
.This is a backwards incompatible change that improves usability for code using asynchronous operations.
* POTENTIAL INCOMPATIBILITY *
Own Id: OTP-17355 Aux Id: OTP-17154
Fixed warnings in code matching on underscore prefixed variables.
Own Id: OTP-17385 Aux Id: OTP-17123
Kernel 7.3.1.7
Improvements and New Features
A new function
global:disconnect/0
has been introduced with which one can cleanly disconnect a node from all other nodes in a cluster ofglobal
nodes.Own Id: OTP-18232 Aux Id: OTP-17843, PR-6264
Kernel 7.3.1.6
Fixed Bugs and Malfunctions
A call to
net_kernel:setopts(new, Opts)
at the same time as a connection was being set up could cause a deadlock between thenet_kernel
process and the process setting up the connection.Own Id: OTP-18198 Aux Id: GH-6129, PR-6216
Kernel 7.3.1.5
Fixed Bugs and Malfunctions
By default
global
does not take any actions to restore a fully connected network when connections are lost due to network issues. This is problematic for all applications expecting a fully connected network to be provided, such as for examplemnesia
, but also forglobal
itself. A network of overlapping partitions might cause the internal state ofglobal
to become inconsistent. Such an inconsistency can remain even after such partitions have been brought together to form a fully connected network again. The effect on other applications that expects that a fully connected network is maintained may vary, but they might misbehave in very subtle hard to detect ways during such a partitioning.In order to prevent such issues, we have introduced a prevent overlapping partitions fix which can be enabled using the
prevent_overlapping_partitions
kernel(6)
parameter. When this fix has been enabled,global
will actively disconnect from nodes that reports that they have lost connections to other nodes. This will cause fully connected partitions to form instead of leaving the network in a state with overlapping partitions. Note that this fix has to be enabled on all nodes in the network in order to work properly. Since this quite substantially changes the behavior, this fix is currently disabled by default. Since you might get hard to detect issues without this fix you are, however, strongly advised to enable this fix in order to avoid issues such as the ones described above. As of OTP 25 this fix will become enabled by default.Own Id: OTP-17843 Aux Id: ERIERL-732, PR-5611
Fix failed accepted connection setup after previous established connection from same node closed down silently.
Own Id: OTP-17979 Aux Id: ERIERL-780
Improvements and New Features
A
net_tickintensity
kernel
parameter has been introduced. It can be used to control the amount of ticks during anet_ticktime
period.A new
net_kernel:start/2
function has also been introduced in order to make it easier to add new options. The use ofnet_kernel:start/1
has been deprecated.Own Id: OTP-17905 Aux Id: ERIERL-732, PR-5740
Kernel 7.3.1.4
Fixed Bugs and Malfunctions
Parsing of the result value in the native DNS resolver has been made more defensive against incorrect results.
Own Id: OTP-17578 Aux Id: ERIERL-683
Kernel 7.3.1.3
Fixed Bugs and Malfunctions
Fix code:get_doc/1 to not crash when module is located in an escript.
Own Id: OTP-17570 Aux Id: PR-5139 GH-4256 ERL-1261
Kernel 7.3.1.2
Fixed Bugs and Malfunctions
Handling of the "." domain as a search domain was incorrect and caused a crash in the DNS resolver
inet_res
, which has now been fixed.Own Id: OTP-17473 Aux Id: GH-4838, OTP-17439
Fixed rare bug that could cause net_kernel process to hang for ever. Have seen to happen with massive number of TLS connections while remote nodes are restarting. Bug exists since OTP-22.0.
Own Id: OTP-17476 Aux Id: GH-4931, PR-4934
Kernel 7.3.1.1
Fixed Bugs and Malfunctions
Fix a race condition in Global.
Own Id: OTP-16033 Aux Id: ERIERL-329, ERL-1414, GH-4448, ERL-885, GH-3923
Kernel 7.3.1
Fixed Bugs and Malfunctions
A bug in the Erlang DNS resolver has been fixed, where it could be made to bring down the kernel supervisor and thereby the whole node, when getting an incorrect (IN A reply to an IN CNAME query) reply from the DNS server and used the reply record's value without verifying its type.
Own Id: OTP-17361
Kernel 7.3
Fixed Bugs and Malfunctions
The range check for compression pointers in DNS encoding was faulty, which caused incorrect label compression encoding for very large DNS messages; larger than about 16 kBytes, such as AXFR responses. This more than 11 year old bug has now been corrected.
Own Id: OTP-13641 Aux Id: PR-2959
Fix of internal links in the
erpc
documentation.Own Id: OTP-17202 Aux Id: PR-4516
Fix bug where complex seq_trace tokens (that is lists, tuples, maps etc) could becomes corrupted by the GC. The bug was introduced in OTP-21.
Own Id: OTP-17209 Aux Id: PR-3039
When running Xref in the
modules
mode, the Debugger application would show up as a dependency for the Kernel applications.Own Id: OTP-17223 Aux Id: GH-4546, PR-4554
Improvements and New Features
erl_epmd
(the epmd client) will now try to reconnect to the local EPMD if the connection is broken.Own Id: OTP-17178 Aux Id: PR-3003
Kernel 7.2.1
Fixed Bugs and Malfunctions
When using the DNS resolver option
servfail_retry_timeout
it did not honour the overall call time-out in e.ginet_res:getbyname/3
. This misbehaviour has now been fixed. Also, theservfail_retry_timeout
behaviour has been improved to only be enforced for servers that gives a servfail answer.Own Id: OTP-12960 Aux Id: ERIERL-598, PR-4509
Kernel 7.2
Fixed Bugs and Malfunctions
The
apply
call's inlogger.hrl
are now called witherlang
prefix to avoid clashed with localapply/3
functions.Own Id: OTP-16976 Aux Id: PR-2807
Fix memory leak in
pg
.Own Id: OTP-17034 Aux Id: PR-2866
Fix crash in
logger_proxy
due to straygen_server:call
replies not being handled. The stray replies come when logger is under heavy load and the flow control mechanism is reaching its limit.Own Id: OTP-17038
Fixed a bug in
erl_epmd:names()
that caused it to return the illegal return valuenoport
instead of{error, Reason}
whereReason
is the actual error reason. This bug also propagated tonet_adm:names()
.This bug was introduced in
kernel
version 7.1 (OTP 23.1).Own Id: OTP-17054 Aux Id: ERL-1424
Improvements and New Features
Add export of some resolver documented types.
Own Id: OTP-16954 Aux Id: ERIERL-544
Add configurable retry timeout for resolver lookups.
Own Id: OTP-16956 Aux Id: ERIERL-547
gen_server:multi_call()
has been optimized in the special case of only calling the local node with timeout set toinfinity
.Own Id: OTP-17058 Aux Id: PR-2887
Kernel 7.1
Fixed Bugs and Malfunctions
A fallback has been implemented for file:sendfile when using inet_backend socket
Own Id: OTP-15187 Aux Id: ERL-1293
Make default TCP distribution honour option
backlog
ininet_dist_listen_options
.Own Id: OTP-16694 Aux Id: PR-2625
Raw option handling for the experimental
gen_tcp_socket
backend was broken so that all raw options were ignored by for examplegen_tcp:listen/2
, a bug that now has been fixed. Reported by Jan Uhlig.Own Id: OTP-16743 Aux Id: ERL-1287
Accept fails with inet-backend socket.
Own Id: OTP-16748 Aux Id: ERL-1284
Fixed various minor errors in the socket backend of gen_tcp.
Own Id: OTP-16754
Correct
disk_log:truncate/1
to count the header. Also correct the documentation to state thatdisk_log:truncate/1
can be used with external disk logs.Own Id: OTP-16768 Aux Id: ERL-1312
Fix erl_epmd:port_please/2,3 type specs to include all possible error values.
Own Id: OTP-16783
Fix
erl -erl_epmd_port
to work properly. Before this fix it did not work at all.Own Id: OTP-16785
Fix typespec for internal function
erlang:seq_trace_info/1
to allowterm/0
as returned label. This in turn fixes so that calls toseq_trace:get_token/1
can be correctly analyzer by dialyzer.Own Id: OTP-16823 Aux Id: PR-2722
Fix erroneous double registration of processes in
pg
when distribution is dynamically started.Own Id: OTP-16832 Aux Id: PR-2738
Improvements and New Features
Make (use of) the socket registry optional (still enabled by default). Its now possible to build OTP with the socket registry turned off, turn it off by setting an environment variable and controlling in runtime (via function calls and arguments when creating sockets).
Own Id: OTP-16763
erl -remsh nodename
no longer requires the hostname to be given when used together with dynamic nodenames.Own Id: OTP-16784
Kernel 7.0
Fixed Bugs and Malfunctions
Fix race condition during shutdown when
shell_history
is enabled. The race condition would trigger crashes indisk_log
.Own Id: OTP-16008 Aux Id: PR-2302
Fix the Erlang distribution to handle the scenario when a node connects that can handle message fragmentation but can not handle the atom cache. This bug only affects users that have implemented a custom distribution carrier. It has been present since OTP-21.
The
DFLAG_FRAGMENT
distribution flag was added to the set of flags that can be rejected by a distribution implementation.Own Id: OTP-16284
Fix bug where a binary was not allowed to be the format string in calls to
logger:log
.Own Id: OTP-16395 Aux Id: PR-2444
Fix bug where
logger
would end up in an infinite loop when trying to log the crash of a handler or formatter.Own Id: OTP-16489 Aux Id: ERL-1134
code:lib_dir/1
has been fixed to also return the lib dir forerts
.This is been marked as an incompatibility for any application that depended on
{error,bad_name}
to be returned forerts
.* POTENTIAL INCOMPATIBILITY *
Own Id: OTP-16502
The application
stop/1
callback was not called if the application master of the application terminated.Own Id: OTP-16504 Aux Id: PR-2328
Fix bug in
application:loaded_applications/0
that could cause it to fail withbadarg
if for example a concurrent upgrade/downgrade is running.Own Id: OTP-16627 Aux Id: PR-2601
Improvements and New Features
A new module
erpc
has been introduced in thekernel
application. Theerpc
module implements an enhanced subset of the operations provided by therpc
module. Enhanced in the sense that it makes it possible to distinguish between returned value, raised exceptions, and other errors.erpc
also has better performance and scalability than the originalrpc
implementation. This by utilizing the newly introducedspawn_request()
BIF. Also therpc
module benefits from these improvements by utilizingerpc
when it is possible.This change has been marked as a potential incompatibility since
rpc:block_call()
now only is guaranteed to block otherblock_call()
operations. The documentation previously claimed that it would block allrpc
operations. This has however never been the case. It previously did not block node-localblock_call()
operations.* POTENTIAL INCOMPATIBILITY *
Own Id: OTP-13450 Aux Id: OTP-15251
A client node can receive its node name dynamically from the node that it first connects to. This featured can by used by
- starting with
erl -sname undefined
- erl_interface functions
ei_connect_init
and friends erl_call -R
Own Id: OTP-13812
- starting with
Improved the printout of single line logger events for most of the OTP behaviours in STDLIB and Kernel. This includes
proc_lib
,gen_server
,gen_event
,gen_statem
,gen_fsm
,supervisor
,supervisor_bridge
andapplication
.Improved the
chars_limit
anddepth
handling inproc_lib
and when formatting of exceptions.Own Id: OTP-15299
Remove usage and documentation of old requests of the I/O-protocol.
Own Id: OTP-15695
Directories can now be opened by
file:open/2
when passing thedirectory
option.Own Id: OTP-15835 Aux Id: PR-2212
The check of whether to log or not based on the log level in
logger
has been optimized by usingpersistent_term
to store the log level.Own Id: OTP-15948 Aux Id: PR-2356
file:read_file_info/2
can now be used on opened files and directories.Own Id: OTP-15956 Aux Id: PR-2231
The
-config
option toerl
now can take multiple config files without repeating the-config
option. Example:erl -config sys local
Own Id: OTP-16148 Aux Id: PR-2373
Improved node connection setup handshake protocol. Made possible to agree on protocol version without dependence on
epmd
or other prior knowledge of peer node version. Also added exchange of node incarnation ("creation") values and expanded the distribution capability flag field from 32 to 64 bits.Own Id: OTP-16229
The possibility to run Erlang distribution without relying on EPMD has been extended. To achieve this a couple of new options to the inet distribution has been added.
-dist_listen false - Setup the distribution channel, but do not listen for incoming connection. This is useful when you want to use the current node to interact with another node on the same machine without it joining the entire cluster.
-erl_epmd_port Port - Configure a default port that the built-in EPMD client should return. This allows the local node to know the port to connect to for any other node in the cluster.
The
erl_epmd
callback API has also been extended to allow returning-1
as the creation which means that a random creation will be created by the node.In addition a new callback function called
listen_port_please
has been added that allows the callback to return which listen port the distribution should use. This can be used instead ofinet_dist_listen_min/max
if the listen port is to be fetched from an external service.Own Id: OTP-16250
A first EXPERIMENTAL module that is a
socket
backend togen_tcp
andinet
has been implemented. Others will follow. Feedback will be appreciated.Own Id: OTP-16260 Aux Id: OTP-15403
The new experimental
socket
module has been moved to the Kernel application.Own Id: OTP-16312
Replace usage of deprecated function in the
group
module.Own Id: OTP-16345
Minor updates due to the new spawn improvements made.
Own Id: OTP-16368 Aux Id: OTP-15251
Update of sequential tracing to also support other information transfers than message passing.
Own Id: OTP-16370 Aux Id: OTP-15251, OTP-15232
code:module_status/1
now accepts a list of modules.code:module_status/0
, which returns the statuses for all loaded modules, has been added.Own Id: OTP-16402
filelib:wildcard/1,2
is now twice as fast when a double star (**
) is part of the pattern.Own Id: OTP-16419
A new implementation of distributed named process groups has been introduced. It is available in the
pg
module.Note that this
pg
module only has the name in common with the experimentalpg
module that was present instdlib
up until OTP 17.Thanks to Maxim Fedorov for the implementation.
Own Id: OTP-16453 Aux Id: PR-2524
The
pg2
module has been deprecated. It has also been scheduled for removal in OTP 24.You are advised to replace the usage of
pg2
with the newly introducedpg
module.pg
has a similar API, but with a more scalable implementation.* POTENTIAL INCOMPATIBILITY *
Own Id: OTP-16455
Refactored the internal handling of deprecated and removed functions.
Own Id: OTP-16469
The internal hosts file resolver cache
inet_hosts
has been rewritten to behave better when the hosts file changes. For example the cache is updated per entry instead of cleared and reloaded so lookups do not temporarily fail during reloading, and; when multiple processes simultaneously request reload these are now folded into one instead of all done in sequence. Reported and first solution suggestion by Maxim Fedorov.Own Id: OTP-16487 Aux Id: PR-2516
Add
code:all_available/0
that can be used to get all available modules.Own Id: OTP-16494
As of OTP 23, the distributed
disk_log
feature has been deprecated. It has also been scheduled for removal in OTP 24.* POTENTIAL INCOMPATIBILITY *
Own Id: OTP-16495
Add the function
code:fetch_docs/1
for fetching embedded documentation for aa Erlang module.Own Id: OTP-16499
Improve configure for the net nif, which should increase portability.
Own Id: OTP-16530 Aux Id: OTP-16464
socket: Socket counters and socket global counters are now represented as maps (instead of property lists).
Own Id: OTP-16535
The experimental socket module has gotten restrictions removed so now the 'seqpacket' socket type should work for any communication domain (protocol family) where the OS supports it, typically the Unix Domain.
Own Id: OTP-16550 Aux Id: ERIERL-476
Allow using custom IO devices in
logger_std_h
.Own Id: OTP-16563 Aux Id: PR-2523
Added
file:del_dir_r/1
which deletes a directory together with all of its contents, similar torm -rf
on Unix systems.Own Id: OTP-16570 Aux Id: PR-2565
socket: By default the socket options rcvtimeo and sndtimeo are now disabled. To enable these, OTP now has to be built with the configure option --enable-esock-rcvsndtimeo
Own Id: OTP-16620
The experimental gen_tcp compatibility code utilizing the socket module could loose buffered data when receiving a specified number of bytes. This bug has been fixed. Reported by Maksim Lapshin on bugs.erlang.org ERL-1234
Own Id: OTP-16632 Aux Id: ERL-1234
Kernel 6.5.2.5
Fixed Bugs and Malfunctions
By default
global
does not take any actions to restore a fully connected network when connections are lost due to network issues. This is problematic for all applications expecting a fully connected network to be provided, such as for examplemnesia
, but also forglobal
itself. A network of overlapping partitions might cause the internal state ofglobal
to become inconsistent. Such an inconsistency can remain even after such partitions have been brought together to form a fully connected network again. The effect on other applications that expects that a fully connected network is maintained may vary, but they might misbehave in very subtle hard to detect ways during such a partitioning.In order to prevent such issues, we have introduced a prevent overlapping partitions fix which can be enabled using the
prevent_overlapping_partitions
kernel(6)
parameter. When this fix has been enabled,global
will actively disconnect from nodes that reports that they have lost connections to other nodes. This will cause fully connected partitions to form instead of leaving the network in a state with overlapping partitions. Note that this fix has to be enabled on all nodes in the network in order to work properly. Since this quite substantially changes the behavior, this fix is currently disabled by default. Since you might get hard to detect issues without this fix you are, however, strongly advised to enable this fix in order to avoid issues such as the ones described above. As of OTP 25 this fix will become enabled by default.Own Id: OTP-17843 Aux Id: ERIERL-732, PR-5611
Improvements and New Features
A
net_tickintensity
kernel
parameter has been introduced. It can be used to control the amount of ticks during anet_ticktime
period.A new
net_kernel:start/2
function has also been introduced in order to make it easier to add new options. The use ofnet_kernel:start/1
has been deprecated.Own Id: OTP-17905 Aux Id: ERIERL-732, PR-5740
Kernel 6.5.2.4
Fixed Bugs and Malfunctions
Fixed rare bug that could cause net_kernel process to hang for ever. Have seen to happen with massive number of TLS connections while remote nodes are restarting. Bug exists since OTP-22.0.
Own Id: OTP-17476 Aux Id: GH-4931, PR-4934
Kernel 6.5.2.3
Fixed Bugs and Malfunctions
Fix a race condition in Global.
Own Id: OTP-16033 Aux Id: ERIERL-329, ERL-1414, GH-4448, ERL-885, GH-3923
Kernel 6.5.2.2
Fixed Bugs and Malfunctions
When running Xref in the
modules
mode, the Debugger application would show up as a dependency for the Kernel applications.Own Id: OTP-17223 Aux Id: GH-4546, PR-4554
Kernel 6.5.2.1
Fixed Bugs and Malfunctions
Fix bug in
application:loaded_applications/0
that could cause it to fail withbadarg
if for example a concurrent upgrade/downgrade is running.Own Id: OTP-16627 Aux Id: PR-2601
Kernel 6.5.2
Fixed Bugs and Malfunctions
The DNS resolver `inet_res` has been fixed to return the last intermediate error when subsequent requests times out.
Own Id: OTP-16414 Aux Id: ERIERL-452
The prim_net nif (net/kernel) made use of an undefined atom, notsup. This has now been corrected.
Own Id: OTP-16440
Fix a crash when attempting to log faults when loading files during early boot.
Own Id: OTP-16491
Fix crash in logger when logging to a remote node during boot.
Own Id: OTP-16493 Aux Id: ERIERL-459
Improvements and New Features
Improved
net_kernel
debug functionality.Own Id: OTP-16458 Aux Id: PR-2525
Kernel 6.5.1
Fixed Bugs and Malfunctions
The 'socket state' info provided by the inet info function has been improved
Own Id: OTP-16043 Aux Id: ERL-1036
Fix bug where
logger
would crash when starting when a very large log file needed to be rotated and compressed.Own Id: OTP-16145 Aux Id: ERL-1034
Fixed a bug causing actual nodedown reason reported by
net_kernel:monitor_nodes(true, [nodedown_reason])
to be lost and replaced by the reasonkilled
.Own Id: OTP-16216
The documentation for
rpc:call/4,5/
has been updated to describe what happens when the called function throws or return an'EXIT'
tuple.Own Id: OTP-16279 Aux Id: ERL-1066
Kernel 6.5
Fixed Bugs and Malfunctions
The type specification for
gen_sctp:connect/4,5
has been corrected.Own Id: OTP-15344 Aux Id: ERL-947
Extra
-mode
flags given toerl
are ignored with a warning.Own Id: OTP-15852
Fix type spec for
seq_trace:set_token/2
.Own Id: OTP-15858 Aux Id: ERL-700
logger:compare_levels/2
would fail with abadarg
exception if given the valuesall
ornone
as any of the parameters. This is now corrected.Own Id: OTP-15942 Aux Id: PR-2301
Fix bug where the log file in
logger_std_h
would not be closed when the inode of the file changed. This would in turn cause a file descriptor leak when tools like logrotate are used.Own Id: OTP-15997 Aux Id: PR-2331
Fix a race condition in the debugging function
net_kernel:nodes_info/0
.Own Id: OTP-16022
Fix race condition when closing a file opened in
compressed
ordelayed_write
mode.Own Id: OTP-16023
Improvements and New Features
The possibility to send ancillary data, in particular the TOS field, has been added to
gen_udp:send/4,5
.Own Id: OTP-15747 Aux Id: ERIERL-294
If the log file was given with relative path, the standard logger handler (
logger_std_h
) would store the file name with relative path. If the current directory of the node was later changed, a new file would be created relative the new current directory, potentially failing with anenoent
if the new directory did not exist. This is now corrected andlogger_std_h
always stores the log file name as an absolute path, calculated from the current directory at the time of the handler startup.Own Id: OTP-15850
Support local sockets with inet:i/0.
Own Id: OTP-15935 Aux Id: PR-2299
Kernel 6.4.1
Fixed Bugs and Malfunctions
user
/user_drv
could respond to io requests before they had been processed, which could cause data to be dropped if the emulator was halted soon after a call toio:format/2
, such as in an escript.Own Id: OTP-15805
Kernel 6.4
Fixed Bugs and Malfunctions
Fix so that when multiple
-sname
or-name
are given toerl
the first one is chosen. Before this fix distribution was not started at all when multiple name options were given.Own Id: OTP-15786 Aux Id: ERL-918
Fix
inet_res
configuration pointing to non-existing files to work again. This was broken in KERNEL-6.3 (OTP-21.3).Own Id: OTP-15806
Improvements and New Features
A simple socket API is provided through the socket module. This is a low level API that does not replace gen_[tcp|udp|sctp]. It is intended to eventually replace the inet driver, but not the high level gen-modules (gen_tcp, gen_udp and gen_sctp). It also provides a basic API that facilitates the implementation of other protocols, that is TCP, UDP and SCTP.
Known issues are; No support for the Windows OS (currently).
Own Id: OTP-14831
Improved the documentation for the linger option.
Own Id: OTP-15491 Aux Id: PR-2019
Global no longer tries more than once when connecting to other nodes.
Own Id: OTP-15607 Aux Id: ERIERL-280
The dist messages EXIT, EXIT2 and MONITOR_DOWN have been updated with new versions that send the reason term as part of the payload of the message instead of as part of the control message.
The old versions are still present and can be used when communicating with nodes that don't support the new versions.
Own Id: OTP-15611
Kernel configuration parameter
start_distribution = boolean()
is added. If set tofalse
, the system is started with all distribution functionality disabled. Defaults totrue
.Own Id: OTP-15668 Aux Id: PR-2088
In OTP-21.3, a warning was introduced for duplicated applications/keys in configuration. This warning would be displayed both when the configuration was given as a file on system start, and during runtime via
application:set_env/1,2
.The warning is now changed to a
badarg
exception inapplication:set_env/1,2
. If the faulty configuration is given in a configuration file on system start, the startup will fail.* POTENTIAL INCOMPATIBILITY *
Own Id: OTP-15692 Aux Id: PR-2170
Kernel 6.3.1.3
Fixed Bugs and Malfunctions
Fix bug where the log file in
logger_std_h
would not be closed when the inode of the file changed. This would in turn cause a file descriptor leak when tools like logrotate are used.Own Id: OTP-15997 Aux Id: PR-2331
Kernel 6.3.1.2
Improvements and New Features
The possibility to send ancillary data, in particular the TOS field, has been added to
gen_udp:send/4,5
.Own Id: OTP-15747 Aux Id: ERIERL-294
Kernel 6.3.1.1
Fixed Bugs and Malfunctions
Fix type spec for
seq_trace:set_token/2
.Own Id: OTP-15858 Aux Id: ERL-700
Kernel 6.3.1
Fixed Bugs and Malfunctions
Fixed a performance regression when reading files opened with the
compressed
flag.Own Id: OTP-15706 Aux Id: ERIERL-336
Kernel 6.3
Fixed Bugs and Malfunctions
If for example the
/etc/hosts
did not come into existence until after the kernel application had started, its content was never read. This bug has now been corrected.Own Id: OTP-14702 Aux Id: PR-2066
Fix bug where doing
seq_trace:reset_trace()
while another process was doing a garbage collection could cause the run-time system to segfault.Own Id: OTP-15490
Fix
erl_epmd:port_please
spec to includeatom/0
andstring/0
.Own Id: OTP-15557 Aux Id: PR-2117
The Logger handler logger_std_h now keeps track of the inode of its log file in order to re-open the file if the inode changes. This may happen, for instance, if the log file is opened and saved by an editor.
Own Id: OTP-15578 Aux Id: ERL-850
When user specific file modes are given to the logger handler
logger_std_h
, they were earlier accepted without any control. This is now changes, so Logger will adjust the file modes as follows:- If
raw
is not found in the list, it is added.
- If none ofwrite
,append
orexclusive
are found in the list,append
is added.
- If none ofdelayed_write
or{delayed_write,Size,Delay}
are found in the list,delayed_write
is added.Own Id: OTP-15602
Improvements and New Features
The standard logger handler,
logger_std_h
, now has a new internal feature for log rotation. The rotation scheme is as follows:The log file to which the handler currently writes always has the same name, i.e. the name which is configured for the handler. The archived files have the same name, but with extension ".N", where N is an integer. The newest archive has extension ".0", and the oldest archive has the highest number.
The size at which the log file is rotated, and the number of archive files that are kept, is specified with the handler specific configuration parameters
max_no_bytes
andmax_no_files
respectively.Archives can be compressed, in which case they get a ".gz" file extension after the integer. Compression is specified with the handler specific configuration parameter
compress_on_rotate
.Own Id: OTP-15479
The new functions
logger:i/0
andlogger:i/1
are added. These provide the same information aslogger:get_config/0
and otherlogger:get_*_config
functions, but the information is more logically sorted and more readable.Own Id: OTP-15600
Logger is now protected against overload due to massive amounts of log events from the emulator or from remote nodes.
Own Id: OTP-15601
Logger now uses os:system_time/1 instead of erlang:system_time/1 to generate log event timestamps.
Own Id: OTP-15625
Add functions
application:set_env/1,2
andapplication:set_env/2
. These take a list of application configuration parameters, and the behaviour is equivalent to callingapplication:set_env/4
individually for each application/key combination, except it is more efficient.set_env/1,2
warns about duplicated applications or keys. The warning is also emitted during boot, if applications or keys are duplicated within one configuration file, e.g. sys.config.Own Id: OTP-15642 Aux Id: PR-2164
Handler specific configuration parameters for the standard handler
logger_std_h
are changed to be more intuitive and more similar to the disk_log handler.Earlier there was only one parameter,
type
, which could have the valuesstandard_io
,standard_error
,{file,FileName}
or{file,FileName,Modes}
.This is now changed, so the following parameters are allowed:
type = standard_io | standard_error | file
file = file:filename()
modes = [file:mode()]
All parameters are optional.
type
defaults tostandard_io
, unless a file name is given, in which case it defaults tofile
. Iftype
is set tofile
, the file name defaults to the same as the handler id.The potential incompatibility is that
logger:get_config/0
andlogger:get_handler_config/1
now returns the new parameters, even if the configuration was set with the old variant, e.g.#{type=>{file,FileName}}
.* POTENTIAL INCOMPATIBILITY *
Own Id: OTP-15662
The new configuration parameter
file_check
is added to the Logger handlerlogger_std_h
. This parameter specifies how long (in milliseconds) the handler may wait before checking if the log file still exists and the inode is the same as when it was opened.The default value is 0, which means that this check is done prior to each write operation. Setting a higher number may improve performance, but adds the risk of losing log events.
Own Id: OTP-15663
Kernel 6.2.1
Fixed Bugs and Malfunctions
Setting the
recbuf
size of an inet socket thebuffer
is also automatically increased. Fix a bug where the auto adjustment of inet buffer size would be triggered even if an explicit inet buffer size had already been set.Own Id: OTP-15651 Aux Id: ERIERL-304
Kernel 6.2
Fixed Bugs and Malfunctions
A new function,
logger:update_handler_config/3
is added, and the handler callbackchanging_config
now has a new argument,SetOrUpdate
, which indicates if the configuration change comes fromset_handler_config/2,3
orupdate_handler_config/2,3
.This allows the handler to consistently merge the new configuration with the old (if the change comes from
update_handler_config/2,3
) or with the default (if the change comes fromset_handler_config/2,3
).The built-in handlers
logger_std_h
andlogger_disk_log_h
are updated accordingly. A bug which could cause inconsistency between the handlers' internal state and the stored configuration is also corrected.* POTENTIAL INCOMPATIBILITY *
Own Id: OTP-15364
Fix fallback when custom erl_epmd client does not implement address_please.
Own Id: OTP-15388 Aux Id: PR-1983
The logger ets table did not have the
read_concurrency
option. This is now added.Own Id: OTP-15453 Aux Id: ERL-782
During system start, logger has a simple handler which prints to stdout. After the kernel supervision is started, this handler is removed and replaced by the default handler. Due to a bug, logger earlier issued a debug printout saying it received an unexpected message, which was the EXIT message from the simple handler's process. This is now corrected. The simple handler's process now unlinks from the logger process before terminating.
Own Id: OTP-15466 Aux Id: ERL-788
The logger handler
logger_std_h
would not re-create it's log file if it was removed. Due to this it could not be used with tools like 'logrotate'. This is now corrected.Own Id: OTP-15469
Improvements and New Features
A function
inet:getifaddrs/1
that takes a list with a namespace option has been added, for platforms that support that feature, for example Linux (only?).Own Id: OTP-15121 Aux Id: ERIERL-189, PR-1974
Added the
nopush
option for TCP sockets, which corresponds toTCP_NOPUSH
on *BSD andTCP_CORK
on Linux.This is also used internally in
file:sendfile
to reduce latency on subsequent send operations.Own Id: OTP-15357 Aux Id: ERL-698
Optimize handling of send_delay for tcp sockes to better work with the new pollthread implementation introduced in OTP-21.
Own Id: OTP-15471 Aux Id: ERIERL-229
Kernel 6.1.1
Fixed Bugs and Malfunctions
Fix bug causing net_kernel process crash on connection attempt from node with name identical to local node.
Own Id: OTP-15438 Aux Id: ERL-781
Kernel 6.1
Fixed Bugs and Malfunctions
The values
all
andnone
are documented as valid value for the Kernel configuration parameterlogger_level
, but would cause a crash during node start. This is now corrected.Own Id: OTP-15143
Fix some potential buggy behavior in how ticks are sent on inter node distribution connections. Tick is now sent to c-node even if there are unsent buffered data, as c-nodes need ticks in order to send reply ticks. The amount of sent data was also calculated wrongly when ticks were suppressed due to unsent buffered data.
Own Id: OTP-15162 Aux Id: ERIERL-191
Non semantic change in dist_util.erl to silence dialyzer warning.
Own Id: OTP-15170
Fixed
net_kernel:connect_node(node())
to returntrue
(and do nothing) as it always has before OTP-21.0. Also documented this successful "self connect" as the expected behavior.Own Id: OTP-15182 Aux Id: ERL-643
The single_line option on logger_formatter would in some cases add an unwanted comma after the association arrows in a map. This is now corrected.
Own Id: OTP-15228
Improved robustness of distribution connection setup. In OTP-21.0 a truly asynchronous connection setup was introduced. This is further improvement on that work to make the emulator more robust and also be able to recover in cases when involved Erlang processes misbehave.
Own Id: OTP-15297 Aux Id: OTP-15279, OTP-15280
Improvements and New Features
A new macro,
?LOG(Level,...)
, is added. This is equivalent to the existing?LOG_<LEVEL>(...)
macros.A new variant of Logger report callback is added, which takes an extra argument containing options for size limiting and line breaks. Module
proc_lib
inSTDLIB
uses this for crash reports.Logger configuration is now checked a bit more for errors.
Own Id: OTP-15132
The socket options
recvtos
,recvttl
,recvtclass
andpktoptions
have been implemented in the socket modules. See the documentation for thegen_tcp
,gen_udp
andinet
modules. Note that support for these in the runtime system is platform dependent. Especially forpktoptions
which is very Linux specific and obsoleted by the RFCs that defined it.Own Id: OTP-15145 Aux Id: ERIERL-187
Add
logger:set_application_level/2
for setting the logger level of all modules in one application.Own Id: OTP-15146
Kernel 6.0.1
Fixed Bugs and Malfunctions
Fixed bug in
net_kernel
that could cause an emulator crash if certain connection attempts failed. Bug exists since kernel-6.0 (OTP-21.0).Own Id: OTP-15280 Aux Id: ERIERL-226, OTP-15279
Kernel 6.0
Fixed Bugs and Malfunctions
Clarify the documentation of
rpc:multicall/5
.Own Id: OTP-10551
The DNS resolver when getting econnrefused from a server retained an invalid socket so look up towards the next server(s) also failed.
Own Id: OTP-13133 Aux Id: PR-1557
No resolver backend returns V4Mapped IPv6 addresses any more. This was inconsistent before, some did, some did not. To facilitate working with such addresses a new function
inet:ipv4_mapped_ipv6_address/1
has been added.* POTENTIAL INCOMPATIBILITY *
Own Id: OTP-13761 Aux Id: ERL-503
The type specifications for
file:posix/0
andinet:posix/0
have been updated according to which errors file and socket operations should be able to return.Own Id: OTP-14019 Aux Id: ERL-550
Fix name resolving in IPv6 only environments when doing the initial distributed connection.
Own Id: OTP-14501
File operations used to accept filenames containing null characters (integer value zero). This caused the name to be truncated and in some cases arguments to primitive operations to be mixed up. Filenames containing null characters inside the filename are now rejected and will cause primitive file operations to fail.
Also environment variable operations used to accept names and values of environment variables containing null characters (integer value zero). This caused operations to silently produce erroneous results. Environment variable names and values containing null characters inside the name or value are now rejected and will cause environment variable operations to fail.
Primitive environment variable operations also used to accept the
$=
character in environment variable names causing various problems.$=
characters in environment variable names are now also rejected.Also
os:cmd/1
now reject null characters inside its command.erlang:open_port/2
will also reject null characters inside the port name from now on.* POTENTIAL INCOMPATIBILITY *
Own Id: OTP-14543 Aux Id: ERL-370
os:putenv
andos:getenv
no longer access the process environment directly and instead work on a thread-safe emulation. The only observable difference is that it's not kept in sync with libcgetenv(3)
/putenv(3)
, so those who relied on that behavior in drivers or NIFs will need to add manual synchronization.On Windows this means that you can no longer resolve DLL dependencies by modifying the
PATH
just before loading the driver/NIF. To make this less of a problem, the emulator now adds the target DLL's folder to the DLL search path.* POTENTIAL INCOMPATIBILITY *
Own Id: OTP-14666
Fixed connection tick toward primitive hidden nodes (erl_interface) that could cause faulty tick timeout in rare cases when payload data is sent to hidden node but not received.
Own Id: OTP-14681
Make group react immediately on an EXIT-signal from shell in e.g ssh.
Own Id: OTP-14991 Aux Id: PR1705
Calls to
gen_tcp:send/2
on closed sockets now returns{error, closed}
instead of{error,enotconn}
.Own Id: OTP-15001
The
included_applications
key are no longer duplicated as application environment variable. Earlier, the included applications could be read both withapplication:get[_all]_env(...)
andapplication:get[_all]_key(...)
functions. Now, it can only be read withapplication:get[_all]_key(...)
.* POTENTIAL INCOMPATIBILITY *
Own Id: OTP-15071
Owner and group changes through
file:write_file_info
,file:change_owner
, andfile:change_group
will no longer report success on permission errors.* POTENTIAL INCOMPATIBILITY *
Own Id: OTP-15118
Improvements and New Features
A new logging API is added to Erlang/OTP, see the
logger
manual page, and section Logging in the Kernel User's Guide.Calls to
error_logger
are automatically redirected to the new API, and legacy error logger event handlers can still be used. It is, however, recommended to use the Logger API directly when writing new code.Notice the following potential incompatibilities:
Kernel configuration parameters
error_logger
still works, but is overruled if the default handler's output destination is configured with Kernel configuration parameterlogger
.In general, parameters for configuring error logger are overwritten by new parameters for configuring Logger.
The concept of SASL error logging is deprecated, meaning that by default the SASL application does not affect which log events are logged.
By default, supervisor reports and crash reports are logged by the default Logger handler started by Kernel, and end up at the same destination (terminal or file) as other standard log event from Erlang/OTP.
Progress reports are not logged by default, but can be enabled by setting the primary log level to info, for example with the Kernel configuration parameter
logger_level
.To obtain backwards compatibility with the SASL error logging functionality from earlier releases, set Kernel configuration parameter
logger_sasl_compatible
totrue
. This prevents the default Logger handler from logging any supervisor-, crash-, or progress reports. Instead, SASL adds a separate Logger handler during application start, which takes care of these log events. The SASL configuration parameterssasl_error_logger
andsasl_errlog_type
specify the destination (terminal or file) and severity level to log for these events.
Since Logger is new in Erlang/OTP 21.0, we do reserve the right to introduce changes to the Logger API and functionality in patches following this release. These changes might or might not be backwards compatible with the initial version.
* POTENTIAL INCOMPATIBILITY *
Own Id: OTP-13295
The function
inet:i/0
has been documented.Own Id: OTP-13713 Aux Id: PR-1645
Typespecs for
netns
andbind_to_device
options have been added togen_tcp
,gen_udp
andgen_sctp
functions.Own Id: OTP-14359 Aux Id: PR-1816
New functionality for implementation of alternative carriers for the Erlang distribution has been introduced. This mainly consists of support for usage of distribution controller processes (previously only ports could be used as distribution controllers). For more information see ERTS User's Guide ➜ How to implement an Alternative Carrier for the Erlang Distribution ➜ Distribution Module.
Own Id: OTP-14459
seq_trace
labels may now be any erlang term.Own Id: OTP-14899
The SSL distribution protocol
-proto inet_tls
has stopped setting the SSL optionserver_name_indication
. New verify funs for client and server ininet_tls_dist
has been added, not documented yet, that checks node name if present in peer certificate. Usage is still also yet to be documented.Own Id: OTP-14969 Aux Id: OTP-14465, ERL-598
Changed timeout of
gen_server
calls toauth
server from default 5 seconds toinfinity
.Own Id: OTP-15009 Aux Id: ERL-601
The callback module passed as
-epmd_module
to erl has been expanded to be able to do name and port resolving.Documentation has also been added in the
erl_epmd
reference manual and ERTS User's Guide How to Implement an Alternative Node Discovery for Erlang Distribution.Own Id: OTP-15086 Aux Id: PR-1694
Included config file specified with relative path in sys.config are now first searched for relative to the directory of sys.config itself. If not found, it is also searched for relative to the current working directory. The latter is for backwards compatibility.
Own Id: OTP-15137 Aux Id: PR-1838
Kernel 5.4.3.2
Fixed Bugs and Malfunctions
Non semantic change in dist_util.erl to silence dialyzer warning.
Own Id: OTP-15170
Kernel 5.4.3.1
Fixed Bugs and Malfunctions
Fix some potential buggy behavior in how ticks are sent on inter node distribution connections. Tick is now sent to c-node even if there are unsent buffered data, as c-nodes need ticks in order to send reply ticks. The amount of sent data was calculated wrongly when ticks where suppressed due to unsent buffered data.
Own Id: OTP-15162 Aux Id: ERIERL-191
Kernel 5.4.3
Fixed Bugs and Malfunctions
Correct a few contracts.
Own Id: OTP-14889
Reject loading modules with names containing directory separators ('/' or '\' on Windows).
Own Id: OTP-14933 Aux Id: ERL-564, PR-1716
Fix bug in handling of os:cmd/2 option max_size on windows.
Own Id: OTP-14940
Kernel 5.4.2
Fixed Bugs and Malfunctions
Add
os:cmd/2
that takes an options map as the second argument.Add
max_size
as an option toos:cmd/2
that control the maximum size of the result thatos:cmd/2
will return.Own Id: OTP-14823
Kernel 5.4.1
Fixed Bugs and Malfunctions
Refactored an internal API.
Own Id: OTP-14784
Kernel 5.4
Fixed Bugs and Malfunctions
Processes which did output after switching jobs (Ctrl+G) could be left forever stuck in the io request.
Own Id: OTP-14571 Aux Id: ERL-472
Improvements and New Features
Lock counting can now be fully toggled at runtime in the lock counting emulator (
-emu_type lcnt
). Everything is enabled by default to match the old behavior, but specific categories can be toggled at will with minimal runtime overhead when disabled. Refer to the documentation onlcnt:rt_mask/1
for details.Own Id: OTP-13170
lcnt:collect
andlcnt:clear
will no longer block all other threads in the runtime system.Own Id: OTP-14412
General Unicode improvements.
Own Id: OTP-14462
Kernel 5.3.1
Fixed Bugs and Malfunctions
The documentation for the 'quiet' option in disk_log:open/1 had an incorrect default value.
Own Id: OTP-14498
Kernel 5.3
Fixed Bugs and Malfunctions
Function
inet:ntoa/1
has been fixed to return lowercase letters according to RFC 5935 that has been approved after this function was written. Previously uppercase letters were returned so this may be a backwards incompatible change depending on how the returned address string is used.Function
inet:parse_address/1
has been fixed to accept %-suffixes on scoped addresses. The addresses does not work yet, but gives no parse errors.* POTENTIAL INCOMPATIBILITY *
Own Id: OTP-13006 Aux Id: ERIERL-20, ERL-429
Fix bug where gethostname would incorrectly fail with enametoolong on Linux.
Own Id: OTP-14310
Fix bug causing
code:is_module_native
to falsely return true whenlocal
call trace is enabled for the module.Own Id: OTP-14390
Add early reject of invalid node names from distributed nodes.
Own Id: OTP-14426
Improvements and New Features
Since Unicode is now allowed in atoms an extra check is needed for node names, which are restricted to Latin-1.
Own Id: OTP-13805
Replaced usage of deprecated symbolic
time unit
representations.Own Id: OTP-13831 Aux Id: OTP-13735
file:write_file(Name, Data, [raw])
would turnData
into a single binary before writing. This meant it could not take advantage of thewritev()
system call if it was given a list of binaries and told to write withraw
mode.Own Id: OTP-13909
The performance of the
disk_log
has been somewhat improved in some corner cases (big items), and the documentation has been clarified.Own Id: OTP-14057 Aux Id: PR-1245
Functions for detecting changed code has been added.
code:modified_modules/0
returns all currently loaded modules that have changed on disk.code:module_status/1
returns the status for a module. In the shell and inc
module,mm/0
is short forcode:modified_modules/0
, andlm/0
reloads all currently loaded modules that have changed on disk.Own Id: OTP-14059
Introduce an event manager in Erlang to handle OS signals. A subset of OS signals may be subscribed to and those are described in the Kernel application.
Own Id: OTP-14186
Sockets can now be bound to device (SO_BINDTODEVICE) on platforms where it is supported.
This has been implemented e.g to support VRF-Lite under Linux; see VRF , and GitHub pull request #1326.
Own Id: OTP-14357 Aux Id: PR-1326
Added option to store shell_history on disk so that the history can be reused between sessions.
Own Id: OTP-14409 Aux Id: PR-1420
The size of crash reports created by
gen_server
,gen_statem
andproc_lib
is limited with aid of the Kernel application variableerror_logger_format_depth
. The purpose is to limit the size of the messages sent to theerror_logger
process when processes with huge message queues or states crash.The crash report generated by
proc_lib
includes the new tagmessage_queue_len
. The neighbour report also includes the new tagcurrent_stacktrace
. Finally, the neighbour report no longer includes the tagsmessages
anddictionary
.The new function
error_logger:get_format_depth/0
can be used to retrieve the value of the Kernel application variableerror_logger_format_depth
.Own Id: OTP-14417
One of the ETS tables used by the
global
module is created with{read_concurrency, true}
in order to reduce contention.Own Id: OTP-14419
Warnings have been added to the relevant documentation about not using un-secure distributed nodes in exposed environments.
Own Id: OTP-14425
Kernel 5.2
Fixed Bugs and Malfunctions
Fix a race during cleanup of os:cmd that would cause os:cmd to hang indefinitely.
Own Id: OTP-14232 Aux Id: seq13275
Improvements and New Features
The functions in the '
file
' module that take a list of paths (e.g.file:path_consult/2
) will now continue to search in the path if the path contains something that is not a directory.Own Id: OTP-14191
Two OTP processes that are known to receive many messages are 'rex' (used by 'rpc') and 'error_logger'. Those processes will now store unprocessed messages outside the process heap, which will potentially decrease the cost of garbage collections.
Own Id: OTP-14192
Kernel 5.1.1
Fixed Bugs and Malfunctions
code:add_pathsa/1
and command line option-pa
both revert the given list of directories when adding it at the beginning of the code path. This is now documented.Own Id: OTP-13920 Aux Id: ERL-267
Add lost runtime dependency to erts-8.1. This should have been done in kernel-5.1 (OTP-19.1) as it cannot run without at least erts-8.1 (OTP-19.1).
Own Id: OTP-14003
Type and doc for gen_{tcp,udp,sctp}:controlling_process/2 has been improved.
Own Id: OTP-14022 Aux Id: PR-1208
Kernel 5.1
Fixed Bugs and Malfunctions
Fix a memory leak when calling seq_trace:get_system_tracer().
Own Id: OTP-13742
Fix for the problem that when adding the ebin directory of an application to the code path, the
code:priv_dir/1
function returns an incorrect path to the priv directory of the same application.Own Id: OTP-13758 Aux Id: ERL-195
Fix code_server crash when adding code paths of two levels.
Own Id: OTP-13765 Aux Id: ERL-194
Respect -proto_dist switch while connection to EPMD
Own Id: OTP-13770 Aux Id: PR-1129
Fixed a bug where init:stop could deadlock if a process with infinite shutdown timeout (e.g. a supervisor) attempted to load code while terminating.
Own Id: OTP-13802
Close stdin of commands run in os:cmd. This is a backwards compatibility fix that restores the behaviour of pre 19.0 os:cmd.
Own Id: OTP-13867 Aux Id: seq13178
Improvements and New Features
Add
net_kernel:setopts/2
andnet_kernel:getopts/2
to control options for distribution sockets in runtime.Own Id: OTP-13564
Rudimentary support for DSCP has been implemented in the guise of a
tclass
socket option for IPv6 sockets.Own Id: OTP-13582
Kernel 5.0.2
Fixed Bugs and Malfunctions
When calling os:cmd from a process that has set trap_exit to true an 'EXIT' message would be left in the message queue. This bug was introduced in kernel vsn 5.0.1.
Own Id: OTP-13813
Kernel 5.0.1
Fixed Bugs and Malfunctions
Fix a os:cmd bug where creating a background job using & would cause os:cmd to hang until the background job terminated or closed its stdout and stderr file descriptors. This bug has existed from kernel 5.0.
Own Id: OTP-13741
Kernel 5.0
Fixed Bugs and Malfunctions
The handling of
on_load
functions has been improved. The major improvement is that if a code upgrade fails because theon_load
function fails, the previous version of the module will now be retained.Own Id: OTP-12593
rpc:call()
andrpc:block_call()
would sometimes cause an exception (which was not mentioned in the documentation). This has been corrected so that{badrpc,Reason}
will be returned instead.Own Id: OTP-13409
On Windows, for modules that were loaded early (such as the
lists
module),code:which/1
would return the path with mixed slashes and backslashes, for example:"C:\\Program Files\\erl8.0/lib/stdlib-2.7/ebin/lists.beam"
. This has been corrected.Own Id: OTP-13410
Make file:datasync use fsync instead of fdatasync on Mac OSX.
Own Id: OTP-13411
The default chunk size for the fallback sendfile implementation, used on platforms that do not have a native sendfile, has been decreased in order to reduce connectivity issues.
Own Id: OTP-13444
Large file writes (2Gb or more) could fail on some Unix platforms (for example, OS X and FreeBSD).
Own Id: OTP-13461
A bug has been fixed where the DNS resolver inet_res did not refresh its view of the contents of for example resolv.conf immediately after start and hence then failed name resolution. Reported and fix suggested by Michal Ptaszek in GitHUB pull req #949.
Own Id: OTP-13470 Aux Id: Pull #969
Fix process leak from global_group.
Own Id: OTP-13516 Aux Id: PR-1008
The function
inet:gethostbyname/1
now honors the resolver optioninet6
instead of always looking up IPv4 addresses.* POTENTIAL INCOMPATIBILITY *
Own Id: OTP-13622 Aux Id: PR-1065
The
Status
argument toinit:stop/1
is now sanity checked to make sureerlang:halt
does not fail.Own Id: OTP-13631 Aux Id: PR-911
Improvements and New Features
Add {line_delim, byte()} option to inet:setopts/2 and decode_packet/3
Own Id: OTP-12837
Added
os:perf_counter/1
.The perf_counter is a very very cheap and high resolution timer that can be used to timestamp system events. It does not have monoticity guarantees, but should on most OS's expose a monotonous time.
Own Id: OTP-12908
The os:cmd call has been optimized on unix platforms to be scale better with the number of schedulers.
Own Id: OTP-13089
New functions that can load multiple modules at once have been added to the '
code
' module. The functions arecode:atomic_load/1
,code:prepare_loading/1
,code:finish_loading/1
, andcode:ensure_modules_loaded/1
.Own Id: OTP-13111
The code path cache feature turned out not to be very useful in practice and has been removed. If an attempt is made to enable the code path cache, there will be a warning report informing the user that the feature has been removed.
Own Id: OTP-13191
When an attempt is made to start a distributed Erlang node with the same name as an existing node, the error message will be much shorter and easier to read than before. Example:
Protocol 'inet_tcp': the name somename@somehost seems to be in use by another Erlang node
Own Id: OTP-13294
The output of the default error logger is somewhat prettier and easier to read. The default error logger is used during start-up of the OTP system. If the start-up fails, the output will be easier to read.
Own Id: OTP-13325
The functions
rpc:safe_multi_server_call/2,3
that were deprecated in R12B have been removed.* POTENTIAL INCOMPATIBILITY *
Own Id: OTP-13449
Update the error reasons in dist_util, and show them in the logs if net_kernel:verbose(1) has been called.
Own Id: OTP-13458
Experimental support for Unix Domain Sockets has been implemented. Read the sources if you want to try it out. Example:
gen_udp:open(0, [{ifaddr,{local,"/tmp/socket"}}])
. Documentation will be written after user feedback on the experimental API.Own Id: OTP-13572 Aux Id: PR-612
Allow heart to be configured to not kill the previous emulator before calling the HEART_COMMAND. This is done by setting the environment variable HEART_NO_KILL to TRUE.
Own Id: OTP-13650
Kernel 4.2
Fixed Bugs and Malfunctions
code:load_abs([10100])
would bring down the entire runtime system and create a crash dump. Corrected to generate an error exception in the calling process.Also corrected specs for code loading functions and added more information in the documentation about the error reasons returned by code-loading functions.
Own Id: OTP-9375
gen_tcp:accept/2
was not time warp safe. This since it used the same time as returned byerlang:now/0
when calculating timeout. This has now been fixed.Own Id: OTP-13254 Aux Id: OTP-11997, OTP-13222
Correct the contract for
inet:getifaddrs/1
.Own Id: OTP-13335 Aux Id: ERL-95
Improvements and New Features
Time warp safety improvements.
Introduced the options
monotonic_timestamp
, andstrict_monotonic_timestamp
to the trace, sequential trace, and system profile functionality. This since the already existingtimestamp
option is not time warp safe.Introduced the option
safe_fixed_monotonic_time
toets:info/2
anddets:info/2
. This since the already existingsafe_fixed
option is not time warp safe.Own Id: OTP-13222 Aux Id: OTP-11997
Add validation callback for heart
The erlang heart process may now have a validation callback installed. The validation callback will be executed, if present, before any heartbeat to heart port program. If the validation fails, or stalls, no heartbeat will be sent and the node will go down.
With the option
'check_schedulers'
heart executes a responsiveness check of the schedulers before a heartbeat is sent to the port program. If the responsiveness check fails, the heartbeat will not be performed (as intended).Own Id: OTP-13250
Clarify documentation of
net_kernel:allow/1
Own Id: OTP-13299
EPMD supports both IPv4 and IPv6
Also affects oldest supported windows version.
Own Id: OTP-13364
Kernel 4.1.1
Fixed Bugs and Malfunctions
Host name lookups though inet_res, the Erlang DNS resolver, are now done case insensitively according to RFC 4343. Patch by Holger Weiß.
Own Id: OTP-12836
IPv6 distribution handler has been updated to share code with IPv4 so that all features are supported in IPv6 as well. A bug when using an IPv4 address as hostname has been fixed.
Own Id: OTP-13040
Caching of host names in the internal DNS resolver inet_res has been made character case insensitive for host names according to RFC 4343.
Own Id: OTP-13083
Cooked file mode buffering has been fixed so file:position/2 now works according to Posix on Posix systems i.e. when file:position/2 returns an error the file pointer is unaffected.
The Windows system documentation, however, is unclear on this point so the documentation of file:position/2 still does not promise anything.
Cooked file mode file:pread/2,3 and file:pwrite/2,3 have been corrected to honor character encoding like the combination of file:position/2 and file:read/2 or file:write/2 already does. This is probably not very useful since the character representation on the caller's side is latin1, period.
Own Id: OTP-13155 Aux Id: PR#646
Improvements and New Features
Add {line_delim, byte()} option to inet:setopts/2 and decode_packet/3
Own Id: OTP-12837
Kernel 4.1
Improvements and New Features
A mechanism for limiting the amount of text that the built-in error logger events will produce has been introduced. It is useful for limiting both the size of log files and the CPU time used to produce them.
This mechanism is experimental in the sense that it may be changed if it turns out that it does not solve the problem it is supposed to solve. In that case, there may be backward incompatible improvements to this mechanism.
See the documentation for the config parameter
error_logger_format_depth
in the Kernel application for information about how to turn on this feature.Own Id: OTP-12864
Kernel 4.0
Fixed Bugs and Malfunctions
Fix error handling in
file:read_line/1
for Unicode contents.Own Id: OTP-12144
Introduce
os:getenv/2
which is similar toos:getenv/1
but returns the passed default value if the required environment variable is undefined.Own Id: OTP-12342
It is now possible to paste text in JCL mode (using Ctrl-Y) that has been copied in the previous shell session. Also a bug that caused the JCL mode to crash when pasting text has been fixed.
Own Id: OTP-12673
Ensure that each segment of an IPv6 address when parsed from a string has a maximum of 4 hex digits
Own Id: OTP-12773
Improvements and New Features
New BIF:
erlang:get_keys/0
, lists all keys associated with the process dictionary. Note:erlang:get_keys/0
is auto-imported.* POTENTIAL INCOMPATIBILITY *
Own Id: OTP-12151 Aux Id: seq12521
The internal group to user_drv protocol has been changed to be synchronous in order to guarantee that output sent to a process implementing the user_drv protocol is printed before replying. This protocol is used by the standard_output device and the ssh application when acting as a client.
This change changes the previous unlimited buffer when printing to standard_io and other devices that end up in user_drv to 1KB.
* POTENTIAL INCOMPATIBILITY *
Own Id: OTP-12240
The
inflateInit/2
anddeflateInit/6
functions now accepts a WindowBits argument equal to 8 and -8.Own Id: OTP-12564
Map error logger warnings to warning messages by default.
Own Id: OTP-12755
Map beam error logger warnings to warning messages by default. Previously these messages were mapped to the error channel by default.
Own Id: OTP-12781
gen_tcp:shutdown/2 is now asynchronous
This solves the following problems with the old implementation:
It doesn't block when the TCP peer is idle or slow. This is the expected behaviour when shutdown() is called: the caller needs to be able to continue reading from the socket, not be prevented from doing so.
It doesn't truncate the output. The current version of gen_tcp:shutdown/2 will truncate any outbound data in the driver queue after about 10 seconds if the TCP peer is idle of slow. Worse yet, it doesn't even inform anyone that the data has been truncated: 'ok' is returned to the caller; and a FIN rather than an RST is sent to the TCP peer.
* POTENTIAL INCOMPATIBILITY *
Own Id: OTP-12797
There are many cases where user code needs to be able to distinguish between a socket that was closed normally and one that was aborted. Setting the option {show_econnreset, true} enables the user to receive ECONNRESET errors on both active and passive sockets.
Own Id: OTP-12843
Kernel 3.2.0.1
Fixed Bugs and Malfunctions
The 'raw' socket option could not be used multiple times in one call to any e.g gen_tcp function because only one of the occurrences were used. This bug has been fixed, and also a small bug concerning propagating error codes from within inet:setopts/2.
Own Id: OTP-11482 Aux Id: seq12872
Kernel 3.2
Fixed Bugs and Malfunctions
A bug causing an infinite loop in hostname resolving has been corrected. To trigger this bug you would have to enter an bogus search method from a configuration file e.g .inetrc.
Bug pinpointed by Emil Holmström
Own Id: OTP-12133
The standard_error process now handles the getopts I/O protocol request correctly and stores its encoding in the same way as standard_io.
Also, io:put_chars(standard_error, [oops]) could previously crash the standard_error process. This is now corrected.
Own Id: OTP-12424
Improvements and New Features
Configuration parameters for the Kernel application that allows setting socket options for the distribution sockets have been added. See the application Kernel documentation; parameters 'inet_dist_listen_options' and 'inet_dist_connect_options'.
Own Id: OTP-12476 Aux Id: OTP-12476
Kernel 3.1
Fixed Bugs and Malfunctions
Make sure to install .hrl files when needed
Own Id: OTP-12197
Removed the undocumented application environment variable 'raw_files' from the kernel application. This variable was checked (by call to application:get_env/2) each time a raw file was to be opened in the file module.
Own Id: OTP-12276
A bug has been fixed when using the netns option to gen_udp, which accidentally only worked if it was the last option.
Own Id: OTP-12314
Improvements and New Features
Updated documentation for inet buffer size options.
Own Id: OTP-12296
Introduce new option 'raw' in file_info and link_info functions. This option allows the caller not to go through the file server for information about files guaranteed to be local.
Own Id: OTP-12325
Kernel 3.0.3
Fixed Bugs and Malfunctions
Accept inet:ip_address() in net_adm:names/1
Own Id: OTP-12154
Kernel 3.0.2
Fixed Bugs and Malfunctions
OTP-11850 fixed filelib:wildcard/1 to work with broken symlinks. This correction, however, introduced problems since symlinks were no longer followed for functions like filelib:ensure_dir/1, filelib:is_dir/1, filelib:file_size/1, etc. This is now corrected.
Own Id: OTP-12054 Aux Id: seq12660
Kernel 3.0.1
Fixed Bugs and Malfunctions
If the Config given to application_controller:change_application_data included other config files, it was only expanded for already existing (loaded) applications. If an upgrade added a new application which had config data in an included config file, the new application did not get correct config data.
This is now changed so config data will be expanded for all applications.
Own Id: OTP-11864
It was allowed to re-load pre-loaded modules such as
erlang
, but that could cause strange and unwanted things to happen, such as callapply/3
to loop. Pre-loaded modules are now sticky by default. (Thanks to Loïc Hoguin for reporting this bug.)code:add_path("/ending/in/slash/")
removes the trailing slash, adding/ending/in/slash
to the code path. However,code:del_path("/ending/in/slash/")
would fail to remove the path since it did not remove the trailing slash. This has been fixed.Own Id: OTP-11913
Fix erts_debug:size/1 to handle Map sizes
Own Id: OTP-11923
The documentation for
file:file_info/1
has been removed. The function itself was removed a long time ago.Own Id: OTP-11982
Kernel 3.0
Fixed Bugs and Malfunctions
Fixed a deadlock possibility in terminate application
Own Id: OTP-11171
Fixed bug where sendfile would return the wrong error code for a remotely closed socket if the socket was in passive mode. (Thanks to Vincent Siliakus for reporting the bug.)
Own Id: OTP-11614
The new option
persistent
is added toapplication:set_env/4
andapplication:unset_env/3
. An environment key set with thepersistent
option will not be overridden by the ones configured in the application resource file on load. This means persistent values will stick after the application is loaded and also on application reload. (Thanks to José Valim)Own Id: OTP-11708
The spec for file:set_cwd/1 is modified to also accept binaries as arguments. This has always been allowed in the code, but it was not reflected in the spec since binaries are mostly used for raw file names. Raw file names are names that are not encoded according to file:native_name_encoding(), and these are not allowed in file:set_cwd/1. The spec is now, however, more allowing in order to avoid unnecessary dialyzer warnings. Raw file names will still fail in runtime with reason 'no_translation'. (Thanks to José Valim)
Own Id: OTP-11787
Improvements and New Features
heart:set_cmd/1 is updated to allow unicode code points > 255 in the given heart command
Own Id: OTP-10843
Dialyzer's
unmatched_return
warnings have been corrected.Own Id: OTP-10908
Make erlang:open_port/2 spawn and spawn_executable handle unicode.
Own Id: OTP-11105
Erlang/OTP has been ported to the realtime operating system OSE. The port supports both smp and non-smp emulator. For details around the port and how to started see the User's Guide in the ose application.
Note that not all parts of Erlang/OTP has been ported.
Notable things that work are: non-smp and smp emulators, OSE signal interaction, crypto, asn1, run_erl/to_erl, tcp, epmd, distribution and most if not all non-os specific functionality of Erlang.
Notable things that does not work are: udp/sctp, os_mon, erl_interface, binding of schedulers.
Own Id: OTP-11334
Add the {active,N} socket option for TCP, UDP, and SCTP, where N is an integer in the range -32768..32767, to allow a caller to specify the number of data messages to be delivered to the controlling process. Once the socket's delivered message count either reaches 0 or is explicitly set to 0 with inet:setopts/2 or by including {active,0} as an option when the socket is created, the socket transitions to passive ({active, false}) mode and the socket's controlling process receives a message to inform it of the transition. TCP sockets receive {tcp_passive,Socket}, UDP sockets receive {udp_passive,Socket} and SCTP sockets receive {sctp_passive,Socket}.
The socket's delivered message counter defaults to 0, but it can be set using {active,N} via any gen_tcp, gen_udp, or gen_sctp function that takes socket options as arguments, or via inet:setopts/2. New N values are added to the socket's current counter value, and negative numbers can be used to reduce the counter value. Specifying a number that would cause the socket's counter value to go above 32767 causes an einval error. If a negative number is specified such that the counter value would become negative, the socket's counter value is set to 0 and the socket transitions to passive mode. If the counter value is already 0 and inet:setopts(Socket, [{active,0}]) is specified, the counter value remains at 0 but the appropriate passive mode transition message is generated for the socket.
Thanks to Steve Vinoski
Own Id: OTP-11368
A call to either the
garbage_collect/1
BIF or thecheck_process_code/2
BIF may trigger garbage collection of another processes than the process calling the BIF. The previous implementations performed these kinds of garbage collections without considering the internal state of the process being garbage collected. In order to be able to more easily and more efficiently implement yielding native code, these types of garbage collections have been rewritten. A garbage collection like this is now triggered by an asynchronous request signal, the actual garbage collection is performed by the process being garbage collected itself, and finalized by a reply signal to the process issuing the request. Using this approach processes can disable garbage collection and yield without having to set up the heap in a state that can be garbage collected.The
garbage_collect/2
, andcheck_process_code/3
BIFs have been introduced. Both taking an option list as last argument. Using these, one can issue asynchronous requests.code:purge/1
andcode:soft_purge/1
have been rewritten to utilize asynchronouscheck_process_code
requests in order to parallelize work.Characteristics impact: A call to the
garbage_collect/1
BIF or thecheck_process_code/2
BIF will normally take longer time to complete while the system as a whole won't be as much negatively effected by the operation as before. A call tocode:purge/1
andcode:soft_purge/1
may complete faster or slower depending on the state of the system while the system as a whole won't be as much negatively effected by the operation as before.Own Id: OTP-11388 Aux Id: OTP-11535, OTP-11648
Add sync option to file:open/2.
The sync option adds the POSIX O_SYNC flag to the open system call on platforms that support the flag or its equivalent, e.g., FILE_FLAG_WRITE_THROUGH on Windows. For platforms that don't support it, file:open/2 returns {error, enotsup} if the sync option is passed in. Thank to Steve Vinoski and Joseph Blomstedt
Own Id: OTP-11498
The contract of
inet:ntoa/1
has been corrected.Thanks to Max Treskin.
Own Id: OTP-11730
Kernel 2.16.4.1
Known Bugs and Problems
When using gen_tcp:connect and the
fd
option withport
and/orip
, theport
andip
options were ignored. This has been fixed so that ifport
and/orip
is specified together withfd
a bind is requested for thatfd
. Ifport
and/orip
is not specified bind will not be called.Own Id: OTP-12061
Kernel 2.16.4
Fixed Bugs and Malfunctions
Fix the typespec for the inet:ifget/2 and inet:ifget/3 return value. Thanks to Ali Sabil.
Own Id: OTP-11377
Fix various typos in erts, kernel and ssh. Thanks to Martin Hässler.
Own Id: OTP-11414
Fix rpc multicall sample code. Thanks to Edwin Fine.
Own Id: OTP-11471
Under rare circumstances a process calling
inet:close/1
,gen_tcp:close/1
,gen_udp:close/1
, orgen_sctp:close/1
could hang in the call indefinitely.Own Id: OTP-11491
Improvements and New Features
Add more SCTP errors as described in RFC 4960. Thanks to Artem Teslenko.
Own Id: OTP-11379
Add new BIF os:unsetenv/1 which deletes an environment variable. Thanks to Martin Hässler.
Own Id: OTP-11446
Kernel 2.16.3
Fixed Bugs and Malfunctions
Fix indentation of User switch command help in Erlang shell. Thanks to Sylvain Benner.
Own Id: OTP-11209
Improvements and New Features
The previous undocumented function ntoa/1 has been added to inet docs and exported in the inet module.
Own Id: OTP-10676 Aux Id: OTP-10314
Fix typo in abcast() function comment. Thanks to Johannes Weissl.
Own Id: OTP-11219
Add application:ensure_all_started/1-2. Thanks to Fred Hebert.
Own Id: OTP-11250
Make edlin understand a few important control keys. Thanks to Stefan Zegenhagen.
Own Id: OTP-11251
Cleanup of hipe_unified_loader, eliminating uses of is_subtype/2 in specs, change module-local void functions to return 'ok' instead of [] and made sure there are no dialyzer warnings with --Wunmatched_returns. Thanks to Kostis Sagonas.
Own Id: OTP-11301
Kernel 2.16.2
Fixed Bugs and Malfunctions
A bug in prim_inet has been corrected. If the port owner was killed at a bad time while closing the socket port the port could become orphaned hence causing port and socket leaking. Reported by Fred Herbert, Dmitry Belyaev and others.
Own Id: OTP-10497 Aux Id: OTP-10562
A few bugs regarding case sensitivity for hostname resolution while using e.g the internal lookup types 'file' and 'dns' has been corrected. When looking up hostnames ASCII letters a-z are to be regarded as the same as A-Z according to RFC 4343 "Domain Name System (DNS) Case Insensitivity Clarification", and this was not always the case.
Own Id: OTP-10689 Aux Id: seq12227
Improvements and New Features
Add
application:ensure_started/1,2
. It is equivavlent toapplication:start/1,2
except it returnsok
for already started applications.Own Id: OTP-10910
Optimize communication with file io server. Thanks to Anthony Ramine.
Own Id: OTP-11040
Erlang source files with non-ASCII characters are now encoded in UTF-8 (instead of latin1).
Own Id: OTP-11041 Aux Id: OTP-10907
Optimization of simultaneous
inet_db
operations on the same socket by using a lock free implementation.Impact on the characteristics of the system: Improved performance.
Own Id: OTP-11074
The
high_msgq_watermark
andlow_msgq_watermark
inet
socket options introduced in OTP-R16A could only be set on TCP sockets. These options are now generic and can be set on all types of sockets.Own Id: OTP-11075 Aux Id: OTP-10336
Fix deep list argument error under Windows in os:cmd/1. Thanks to Aleksandr Vinokurov .
Own Id: OTP-11104
Kernel 2.16.1
Fixed Bugs and Malfunctions
A bug that could cause a crash with wrong reason has been corrected in the
application_controller
module.Own Id: OTP-10754
Fix
code:is_module_native/1
that sometimes in R16A returned false for hipe compiled modules containing BIFs such aslists
.Own Id: OTP-10870
Respect
{exit_on_close,false}
option on tcp socket in non-passive mode when receiving fails (due to an ill-formed packet for example) by only doing a half close and still allow sending on the socket. (Thanks to Anthony Molinaro and Steve Vinoski for reporting the problem)Own Id: OTP-10879
Improvements and New Features
Slightly nicer error message when node start fails due to duplicate name. Thanks to Magnus Henoch.
Own Id: OTP-10797
Miscellaneous updates due to Unicode support.
Own Id: OTP-10820
Add a new function code:get_mode() can be used to detect how the code servers behaves. Thanks to Vlad Dumitrescu
Own Id: OTP-10823
Fix type of error Reason on gen_tcp:send/2. Thanks to Sean Cribbs.
Own Id: OTP-10839
file:list_dir_all/1
andfile:read_link_all/1
that can handle raw file names have been added. See the User Guide for STDLIB for information about raw file names.Own Id: OTP-10852
Kernel 2.16
Fixed Bugs and Malfunctions
It is no longer possible to have
{Mod,Vsn}
in the 'modules' list in a .app file.This was earlier possible, although never documented in the .app file reference manual. It was however visible in the documentation of
application:load/[1,2]
, where the same term as in a .app file can be used as the first argument.The possibility has been removed since the
Vsn
part was never used.* POTENTIAL INCOMPATIBILITY *
Own Id: OTP-10417
The contract of
erl_ddll:format_error/1
has been corrected. (Thanks to Joseph Wayne Norton.)Own Id: OTP-10473
Change printout of application crash message on startup to formatted strings (Thanks to Serge Aleynikov)
Own Id: OTP-10620
The type
ascii_string()
in thebase64
module has been corrected. The typefile:file_info()
has been cleaned up. The typefile:fd()
has been made opaque in the documentation.Own Id: OTP-10624 Aux Id: kunagi-352 [263]
Improvements and New Features
Inet exported functionality
inet:parse_ipv4_address/1, inet:parse_ipv4strict_address/1, inet:parse_ipv6_address/1, inet:parse_ipv6strict_address/1, inet:parse_address/1 and inet:parse_strict_address is now exported from the inet module.
Own Id: OTP-8067 Aux Id: kunagi-274 [185]
A boolean socket option 'ipv6_v6only' for IPv6 sockets has been added. The default value of the option is OS dependent, so applications aiming to be portable should consider using
{ipv6_v6only,true}
when creating aninet6
listening/destination socket, and if necessary also create aninet
socket on the same port for IPv4 traffic. See the documentation.Own Id: OTP-8928 Aux Id: kunagi-193 [104]
Support for Unicode has been implemented.
Own Id: OTP-10302
The documentation for
global:register_name/3
has been updated to mention that the use of{Module,Function}
as the method argument (resolve function) is deprecated.Own Id: OTP-10419
Fixed bug where sendfile on oracle solaris would return an error when a partial send was done.
Own Id: OTP-10549
The
error_handler
module will now call'$handle_undefined_function'/2
if an attempt is made to call a non-existing function in a module that exists. See the documentation forerror_handler
module for details.Own Id: OTP-10617 Aux Id: kunagi-340 [251]
Where necessary a comment stating encoding has been added to Erlang files. The comment is meant to be removed in Erlang/OTP R17B when UTF-8 becomes the default encoding.
Own Id: OTP-10630
Do not return wrong terms unnecessarily. (Thanks to Kostis Sagonas.)
Own Id: OTP-10662
Some examples overflowing the width of PDF pages have been corrected.
Own Id: OTP-10665
Add file:allocate/3 operation
This operation allows pre-allocation of space for files. It succeeds only on systems that support such operation. (Thanks to Filipe David Manana)
Own Id: OTP-10680
Add application:get_key/3. The new function provides a default value for a configuration parameter. Thanks to Serge Aleynikov.
Own Id: OTP-10694
Add search to Erlang shell's history. Thanks to Fred Herbert.
Own Id: OTP-10739
Kernel 2.15.3
Fixed Bugs and Malfunctions
Ensure 'erl_crash.dump' when asked for it. This will change erl_crash.dump behaviour.
* Not setting ERL_CRASH_DUMP_SECONDS will now terminate beam immediately on a crash without writing a crash dump file.
* Setting ERL_CRASH_DUMP_SECONDS to 0 will also terminate beam immediately on a crash without writing a crash dump file, i.e. same as not setting ERL_CRASH_DUMP_SECONDS environment variable.
* Setting ERL_CRASH_DUMP_SECONDS to a negative value will let the beam wait indefinitely on the crash dump file being written.
* Setting ERL_CRASH_DUMP_SECONDS to a positive value will let the beam wait that many seconds on the crash dump file being written.
A positive value will set an alarm/timeout for restart both in beam and in heart if heart is running.
* POTENTIAL INCOMPATIBILITY *
Own Id: OTP-10422 Aux Id: kunagi-250 [161]
Kernel 2.15.2
Fixed Bugs and Malfunctions
Fixed issue where using controlling_process/2 with self() as the second argument caused the port to leak if self() crashes. (Thanks to Ricardo Catalinas Jiménez)
Own Id: OTP-10094
When sending large files using the file:sendfile fallback file:sendfile would crash. This is now fixed.
Own Id: OTP-10098
Fix rpc:call/5 for local calls with a finite Timeout (Thanks to Tomer Chachamu)
Own Id: OTP-10149
fix escript/primary archive reloading
If the mtime of an escript/primary archive file changes after being added to the code path, correctly reload the archive and update the cache. (Thanks to Tuncer Ayaz)
Own Id: OTP-10151
Support added for home directories named with non-ASCII characters (codepoints above 127) on a system running in Unicode file mode (e.g. on MacOSX or Linux with startup arguments +fnu or +fna with the right LOCALE). Also environment variables with Unicode content are supported in applicable environments.
Own Id: OTP-10160
Allow mixed IPv4 and IPv6 addresses to sctp_bindx
Also allow mixed address families to bind, since the first address on a multihomed sctp socket must be bound with bind, while the rest are to be bound using sctp_bindx. At least Linux supports adding address of mixing families. Make inet_set_faddress function available also when HAVE_SCTP is not defined, since we use it to find an address for bind to be able to mix ipv4 and ipv6 addresses. Thanks to Tomas Abrahamsson
Own Id: OTP-10217
Improvements and New Features
Document inet options: high_watermark, priority, linger and a some other options that previously was undocumented.
Own Id: OTP-10053
Remove bit8 option support from inet
Own Id: OTP-10056
The type of the disk log header has been corrected. (Thanks to Niclas Eklund.)
Own Id: OTP-10131
Kernel 2.15.1
Fixed Bugs and Malfunctions
Driver output has been corrected so output of large binaries (> 4 GiB) now does not silently fail or crash the emulator, but either outputs the binary or fails the call. This means that writing a binary > 4 Gib to file now works but on e.g 64-bit Windows (that has scatter/gather I/O buffer segment lengths of 32 bits) fails. The behaviour may change in the future to always write the binary, in parts if necessary.
Own Id: OTP-9820 Aux Id: OTP-9795
erts: minor fix for unnecessary condition erts: change SENDFILE_CHUNK_SIZE from signed to unsigned (Thanks to jovi zhang)
Own Id: OTP-9872
Two contracts in
gen_sctp
have been corrected.Own Id: OTP-9874
If a process calls a module with an running on_load handler, the process is supposed to be suspended. But if the module with the on_load handler was loading used
code:load_binary/3
, the call would instead fail with anundef
exception.Own Id: OTP-9875
File name and error reason is now returned if creation of a cookie fails. (Thanks to Magnus Henoch)
Own Id: OTP-9954
Fix port leak in
zlib
when passing invalid data tocompress,uncompress,zip,unzip,gzip,gunzip
.Own Id: OTP-9981
Various typographical errors corrected in documentation for the global, error_logger, etop, lists, ets and supervisor modules and in the c_portdriver and kernel_app documentation. (Thanks to Ricardo Catalinas Jiménez)
Own Id: OTP-9987
Fix returned error from gen_tcp:accept/1,2 when running out of ports.
The {error, enfile} return value is badly misleading and confusing for this case, since the Posix ENFILE errno value has a well-defined meaning that has nothing to do with Erlang ports. The fix changes the return value to {error, system_limit}, which is consistent with e.g. various file(3) functions. inet:format_error/1 has also been updated to support system_limit in the same manner as file:format_error/1. (Thanks to Per Hedeland)
Own Id: OTP-9990
erts_debug:size/1
has been corrected to take sharing in the environment of funs into account. For funs it used to always give the same result aserts_debug:flat_size/1
.Own Id: OTP-9991
In some cases when the process doing file:sendfile crashes while sending the file the efile_drv code would not clean up after itself correctly. This has now been fixed.
Own Id: OTP-9993
On BSD based platforms file:sendfile would sometime go into an infinite loop when sending big files. This has now been fixed.
Own Id: OTP-9994
While
disk_log
eagerly collects logged terms for better performance, collecting too much data may choke the system and cause huge binaries to be written.The problem was addressed in OTP-9764, but the situation was not improved in all cases.
(Thanks to Richard Carlsson.)
Own Id: OTP-9999 Aux Id: OTP-9764
The documentation of .app files incorrectly said that the default value for the
mod
parameter isundefined
. This is now corrected to[]
.Own Id: OTP-10002
Kernel 2.15
Fixed Bugs and Malfunctions
Calls to
global:whereis_name/1
have been substituted for calls toglobal:safe_whereis_name/1
since the latter is not safe at all.The reason for not doing this earlier is that setting a global lock masked out a bug concerning the restart of supervised children. The bug has now been fixed by a modification of
global:whereis_name/1
. (Thanks to Ulf Wiger for code contribution.)A minor race conditions in
gen_fsm:start*
has been fixed: if one of these functions returned{error, Reason}
or ignore, the name could still be registered (either locally or inglobal
. (This is the same modification as was done for gen_server in OTP-7669.)The undocumented function
global:safe_whereis_name/1
has been removed.Own Id: OTP-9212 Aux Id: seq7117, OTP-4174
Honor option
packet_size
for http packet parsing by both TCP socket anderlang:decode_packet
. This gives the ability to accept HTTP headers larger than the default setting, but also avoid DoS attacks by accepting lines only up to whatever length you wish to allow. For consistency, packet typeline
also honor optionpacket_size
. (Thanks to Steve Vinoski)Own Id: OTP-9389
disk_log:reopen/2,3
anddisk_log:breopen/3
could return the error reason fromfile:rename/2
rather than the reason{file_error, Filename, Reason}
. This bug has been fixed.The message
{disk_log, Node, {error, disk_log_stopped}}
which according the documentation is sent upon failure to truncate or reopen a disk log was sometimes turned into a reply. This bug has been fixed.* POTENTIAL INCOMPATIBILITY *
Own Id: OTP-9508
Environment variable 'shutdown_timeout' is added to kernel application. Earlier, application_controller would hang forever if an application top supervisor did not terminate upon a shutdown request. If this new environment variable is set to a positive integer T, then application controller will now give up after T milliseconds and instead brutally kill the application. For backwards compatibility, the default value for shutdown_timeout is 'infinity'.
Own Id: OTP-9540
Add '-callback' attributes in stdlib's behaviours
Replace the behaviour_info(callbacks) export in stdlib's behaviours with -callback' attributes for all the callbacks. Update the documentation with information on the callback attribute Automatically generate 'behaviour_info' function from '-callback' attributes
'behaviour_info(callbacks)' is a special function that is defined in a module which describes a behaviour and returns a list of its callbacks.
This function is now automatically generated using the '-callback' specs. An error is returned by lint if user defines both '-callback' attributes and the behaviour_info/1 function. If no type info is needed for a callback use a generic spec for it. Add '-callback' attribute to language syntax
Behaviours may define specs for their callbacks using the familiar spec syntax, replacing the '-spec' keyword with '-callback'. Simple lint checks are performed to ensure that no callbacks are defined twice and all types referred are declared.
These attributes can be then used by tools to provide documentation to the behaviour or find discrepancies in the callback definitions in the callback module.
Add callback specs into 'application' module in kernel Add callback specs to tftp module following internet documentation Add callback specs to inets_service module following possibly deprecated comments
Own Id: OTP-9621
make tab completion work in remote shells (Thanks to Mats Cronqvist)
Own Id: OTP-9673
Add missing parenthesis in heart doc.
Add missing spaces in the Reference Manual distributed section.
In the HTML version of the doc those spaces are necessary to separate those words.
Own Id: OTP-9693
Fixes net_kernel:get_net_ticktime() doc
Adds missing description when `ignored' is returned. (Thanks to Ricardo Catalinas Jiménez )
Own Id: OTP-9713
While
disk_log
eagerly collects logged terms for better performance, collecting too much data may choke the system and cause huge binaries to be written. In order to remedy the situation a (small) limit on the amount of data that is collected before writing to disk has been introduced.Own Id: OTP-9764
- Correct callback spec in application module
- Refine warning about callback specs with extra ranges
- Cleanup autoimport compiler directives
- Fix Dialyzer's warnings in typer
- Fix Dialyzer's warning for its own code
- Fix bug in Dialyzer's behaviours analysis
- Fix crash in Dialyzer
- Variable substitution was not generalizing any unknown variables.
Own Id: OTP-9776
Fix a crash when file:change_time/2,3 are called with invalid dates
Calling file:change_time/2,3 with an invalid date tuple (e.g file:change_time("file.txt", {undefined, undefined})) will cause file_server_2 to crash. error_logger will shutdown and the whole VM will stop. Change behavior to validate given dates on system boundaries. (i.e before issuing a server call).(Thanks to Ahmed Omar)
Own Id: OTP-9785
Improvements and New Features
An option list argument can now be passed to
file:read_file_info/2, file:read_link_info/2
andfile:write_file_info/3
and set time type information in the call. Valid options are{time, local}, {time, universal}
and{time, posix}
. In the case ofposix
time no conversions are made which makes the operation a bit faster.Own Id: OTP-7687
file:list_dir/1,2
will now fill an buffer entire with filenames from the efile driver before sending it to an erlang process. This will speed up this file operation in most cases.Own Id: OTP-9023
gen_sctp:open/0-2 may now return {error,eprotonosupport} if SCTP is not supported
gen_sctp:peeloff/1 has been implemented and creates a one-to-one socket which also are supported now
* POTENTIAL INCOMPATIBILITY *
Own Id: OTP-9239
Sendfile has been added to the file module's API. sendfile/2 is used to read data from a file and send it to a tcp socket using a zero copying mechanism if available on that OS.
Thanks to Tuncer Ayaz and Steve Vinovski for original implementation
Own Id: OTP-9240
Tuple funs (a two-element tuple with a module name and a function) are now officially deprecated and will be removed in R16. Use '
fun M:F/A
' instead. To make you aware that your system uses tuple funs, the very first time a tuple fun is applied, a warning will be sent to the error logger.Own Id: OTP-9649
Kernel 2.14.5
Fixed Bugs and Malfunctions
Fix type of Packet arg of gen_tcp:send/2 and gen_udp:send/4
The type is marked as a binary() or a string() but in practice it can be an iodata(). The test suite was updated to confirm the gen_tcp/2 and gen_udp:send/4 functions accept iodata() (iolists) packets. (Thanks to Filipe David Manana)
Own Id: OTP-9514
XML files have been corrected.
Own Id: OTP-9550 Aux Id: OTP-9541
Improvements and New Features
The types and specifications of the inet modules have been improved.
Own Id: OTP-9260
Types and specifications have been added.
Own Id: OTP-9356
Contracts in STDLIB and Kernel have been improved and type errors have been corrected.
Own Id: OTP-9485
Update documentation and specifications of some of the zlib functions.
Own Id: OTP-9506
Kernel 2.14.4
Fixed Bugs and Malfunctions
The send_timeout option in gen_tcp did not work properly in active mode or with {active,once} options. This is now corrected.
Own Id: OTP-9145
Fixed various typos across the documentation (Thanks to Tuncer Ayaz)
Own Id: OTP-9154
Fix typo in doc of rpc:pmap/3 (Thanks to Ricardo Catalinas Jiménez)
Own Id: OTP-9168
A bug in inet_res, the specialized DNS resolver, has been corrected. A late answer with unfortunate timing could cause a runtime exception. Some code cleanup and improvements also tagged along. Thanks to Evegeniy Khramtsov for a pinpointing bug report and bug fix testing.
Own Id: OTP-9221 Aux Id: OTP-8712
Improvements and New Features
Types and specifications have been added.
Own Id: OTP-9268
Erlang types and specifications are used for documentation.
Own Id: OTP-9272
Two opaque types that could cause warnings when running Dialyzer have been modified.
Own Id: OTP-9337
Kernel 2.14.3
Fixed Bugs and Malfunctions
os:find_executable/{1,2}
will no longer return the path of a directory that happens to be in the PATH.Own Id: OTP-8983 Aux Id: seq11749
Fix -spec for file:write_file/3
Change type for second parameter from binary() to iodata(), since the function explicitly takes steps to accept lists as well as binaries. (thanks to Magnus Henoch).
Own Id: OTP-9067
Sanitize the specs of the code module
After the addition of unicode_binary() to the file:filename() type, dialyzer started complaining about erroneous or incomplete specs in some functions of the 'code' module. The culprit was hard-coded information in erl_bif_types for functions of this module, which were not updated. Since these functions have proper specs these days and code duplication (pun intended) is never a good idea, their type information was removed from erl_bif_types.
While doing this, some erroneous comments were fixed in the code module and also made sure that the code now runs without dialyzer warnings even when the -Wunmatched_returns option is used.
Some cleanups were applied to erl_bif_types too.
Own Id: OTP-9100
- Add spec for function that does not return - Strengthen spec - Introduce types to avoid duplication in specs - Add specs for functions that do not return - Add specs for behaviour callbacks - Simplify two specs
Own Id: OTP-9127
Kernel 2.14.2
Improvements and New Features
The Erlang VM now supports Unicode filenames. The feature is turned on by default on systems where Unicode filenames are mandatory (Windows and MacOSX), but can be enabled on other systems with the '+fnu' emulator option. Enabling the Unicode filename feature on systems where it is not default is however considered experimental and not to be used for production. Together with the Unicode file name support, the concept of "raw filenames" is introduced, which means filenames provided without implicit unicode encoding translation. Raw filenames are provided as binaries, not lists. For further information, see stdlib users guide and the chapter about using Unicode in Erlang. Also see the file module manual page.
* POTENTIAL INCOMPATIBILITY *
Own Id: OTP-8887
There is now a new function inet:getifaddrs/0 modeled after C library function getifaddrs() on BSD and LInux that reports existing interfaces and their addresses on the host. This replaces the undocumented and unsupported inet:getiflist/0 and inet:ifget/2.
Own Id: OTP-8926
Kernel 2.14.1.1
Fixed Bugs and Malfunctions
In embedded mode, on_load handlers that called
code:priv_dir/1
or other functions incode
would hang the system. Since thecrypto
application now contains an on_loader handler that callscode:priv_dir/1
, including thecrypto
application in the boot file would prevent the system from starting.Also extended the
-init_debug
option to print information about on_load handlers being run to facilitate debugging.Own Id: OTP-8902 Aux Id: seq11703
Kernel 2.14.1
Fixed Bugs and Malfunctions
Fixed: inet:setopts(S, [{linger,{true,2}}]) returned {error,einval} for SCTP sockets. The inet_drv had a bug when checking the option size.
Own Id: OTP-8726 Aux Id: seq11617
gen_udp:connect/3 was broken for SCTP enabled builds. It did not detect remote end errors as it should.
Own Id: OTP-8729
reference() has been substituted for ref() in the documentation.
Own Id: OTP-8733
A bug introduced in kernel-2.13.5.3 has been fixed. If running
net_kernel:set_net_ticktime/1
twice within theTransitionPerod
the second call caused the net_kernel process to crash with abadmatch
.Own Id: OTP-8787 Aux Id: seq11657, OTP-8643
inet:getsockopt for SCTP sctp_default_send_param had a bug to not initialize required feilds causing random answers. It is now corrected.
Own Id: OTP-8795 Aux Id: seq11655
For a socket in the HTTP packet mode, the return value from
gen_tcp:recv/2,3
if there is an error in the header will be{ok,{http_error,String}}
instead of{error,{http_error,String}}
to be consistent withssl:recv/2,3
.* POTENTIAL INCOMPATIBILITY *
Own Id: OTP-8831
Improvements and New Features
Even when configuring erlang with --enable-native-libs, the native code for modules loaded very early (such as lists) would not get loaded. This has been corrected. (Thanks to Paul Guyot.)
Own Id: OTP-8750
The undocumented function inet:ifget/2 has been improved to return interface hardware address (MAC) on platforms supporting getaddrinfo() (such as BSD unixes). Note it still does not work on all platforms for example not Windows nor Solaris, so the function is still undocumented.
Buffer overflow and field init bugs for inet:ifget/2 and inet:getservbyname/2 has also been fixed.
Thanks to Michael Santos.
Own Id: OTP-8816
As a usability improvement the 'inet6' option to functions gen_tcp:listen/2, gen_tcp:connect/3-4, gen_udp:open/2 and gen_sctp:open/1-2 is now implicit if the address argument or the 'ip' option contain an IPv6 address (8-tuple).
Own Id: OTP-8822
Kernel 2.14
Fixed Bugs and Malfunctions
os:find_executable can now be fed with the complete name of the executable on Windows and still find it. I.e os:find_executable("werl.exe") will work as os:find_executable("werl").
Own Id: OTP-3626
The shell's line editing has been improved to more resemble the behaviour of readline and other shells. (Thanks to Dave Peticolas)
Own Id: OTP-8635
Under certain circumstances the net kernel could hang. (Thanks to Scott Lystig Fritchie.)
Own Id: OTP-8643 Aux Id: seq11584
The kernel DNS resolver was leaking one or two ports if the DNS reply could not be parsed or if the resolver(s) caused noconnection type errors. Bug now fixed. A DNS specification borderline truncated reply triggering the port leakage bug has also been fixed.
Own Id: OTP-8652
Improvements and New Features
As of this version, the global name server no longer supports nodes running Erlang/OTP R11B.
Own Id: OTP-8527
The file module's functions write,read and read_line now handles named io_servers like 'standard_io' and 'standard_error' correctly.
Own Id: OTP-8611
The functions file:advise/4 and file:datasync/1 have been added. (Thanks to Filipe David Manana.)
Own Id: OTP-8637
When exchanging groups between nodes
pg2
did not remove duplicated members. This bug was introduced in R13B03 (kernel-2.13.4).Own Id: OTP-8653
There is a new option 'exclusive' to file:open/2 that uses the OS O_EXCL flag where supported to open the file in exclusive mode.
Own Id: OTP-8670
Kernel 2.13.5.3
Fixed Bugs and Malfunctions
A bug introduced in Kernel 2.13.5.2 has been fixed.
Own Id: OTP-8686 Aux Id: OTP-8643
Kernel 2.13.5.2
Fixed Bugs and Malfunctions
Under certain circumstances the net kernel could hang. (Thanks to Scott Lystig Fritchie.)
Own Id: OTP-8643 Aux Id: seq11584
Kernel 2.13.5.1
Fixed Bugs and Malfunctions
A race condition in
os:cmd/1
could cause the caller to get stuck inos:cmd/1
forever.Own Id: OTP-8502
Kernel 2.13.5
Fixed Bugs and Malfunctions
A race bug affecting
pg2:get_local_members/1
has been fixed. The bug was introduced in R13B03.Own Id: OTP-8358
The loading of native code was not properly atomic in the SMP emulator, which could cause crashes. Also a per-MFA information table for the native code has now been protected with a lock since it turns that it could be accessed concurrently in the SMP emulator. (Thanks to Mikael Pettersson.)
Own Id: OTP-8397
user.erl (used in oldshell) is updated to handle unicode in prompt strings (io:get_line/{1,2}). io_lib is also updated to format prompts with the 't' modifier (i.e. ~ts instead of ~s).
Own Id: OTP-8418 Aux Id: OTP-8393
The resolver routines failed to look up the own node name as hostname, if the OS native resolver was erroneously configured, bug reported by Yogish Baliga, now fixed.
The resolver routines now tries to parse the hostname as an IP string as most OS resolvers do, unless the native resolver is used.
The DNS resolver inet_res and file resolver inet_hosts now do not read OS configuration files until they are needed. Since the native resolver is default, in most cases they are never needed.
The DNS resolver's automatic updating of OS configuration file data (/etc/resolv.conf) now uses the 'domain' keyword as default search domain if there is no 'search' keyword.
Own Id: OTP-8426 Aux Id: OTP-8381
Improvements and New Features
The expected return value for an on_load function has been changed. (See the section about code loading in the Reference manual.)
* POTENTIAL INCOMPATIBILITY *
Own Id: OTP-8339
Explicit top directories in archive files are now optional.
For example, if an archive (app-vsn.ez) just contains an app-vsn/ebin/mod.beam file, the file info for the app-vsn and app-vsn/ebin directories are faked using the file info from the archive file as origin. The virtual directories can also be listed. For short, the top directories are virtual if they does not exist.
Own Id: OTP-8387
code:clash/0
now looks inside archives (.ez files). (Thanks to Tuncer Ayaz.)Own Id: OTP-8413
There are new
gen_sctp:connect_init/*
functions that initiate an SCTP connection without blocking for the result. The result is delivered asynchronously as an sctp_assoc_change event. (Thanks to Simon Cornish.)Own Id: OTP-8414
Kernel 2.13.4
Fixed Bugs and Malfunctions
A link in
m:pg2
has been fixed. (Thanks to Christophe Romain.)Own Id: OTP-8198
A ticker process could potentially be blocked indefinitely trying to send a tick to a node not responding. If this happened, the connection would not be brought down as it should.
Own Id: OTP-8218
A bug in
pg2
when members who died did not leave process groups has been fixed. (Thanks to Matthew Dempsky.)Own Id: OTP-8259
Improvements and New Features
The documentation is now built with open source tools (xsltproc and fop) that exists on most platforms. One visible change is that the frames are removed.
Own Id: OTP-8201
The top directory in archive files does not need to have a
-vsn
suffix anymore. For example if the archive file has the name likemnesia-4.4.7.ez
the top directory in the archive can either be namedmnesia
ormnesia-4.4.7
. If the archive file has a name likemnesia.ez
the top directory in the archive must be namedmnesia
as earlier.Own Id: OTP-8266
The -on_load() directive can be used to run a function when a module is loaded. It is documented in the section about code loading in the Reference Manual.
Own Id: OTP-8295
Kernel 2.13.3
Improvements and New Features
The DNS resolver client inet_res has been rewritten, documented and released. See inet_res(3) and Erts User's Guide: Inet configuration.
It can formally not be incompatible with respect to earlier versions since there was no earlier official version. However it was used before and some details have changed.
Configuration now initializes from /etc/resolv.conf and /etc/hosts on all unix platforms regardless of which distribution mode the node is started in. The directory (/etc) these files are supposed to reside in can be changed via an environment variable. These configuration file locations can also be changed in the inet configuration. The files are monitored for change and re-read, which makes a few resolver configuration variables out of application control. The /etc/hosts entries have now their own cache table that is shadowed (with lookup method 'file' is used) by the application configured host entries. This problem (that inet_res configuration only worked for distribution mode long names) was among other reported by Matthew O'Gorman many moons ago.
The lookup methods are still 'native' only per default. Resolver configuration is done on all Unix platforms just to get a usable configuration for direct calls to inet_res.
The functions
inet_res:nslookup/3..5
andinet_res:nnslookup/4..4
are no longer recommended to use, instead useinet_res:lookup/3..5
andinet_res:resolve/3..5
which provide clearer argument types and the possibility to override options in the call.Users of previous unsupported versions of inet_res have included internal header files to get to the internal record definitions in order to examine DNS replies. This is still unsupported and there are access functions in inet_dns to use instead. These are documented in inet_res(3).
Bug fix: a compression reference loop would make DNS message decoding loop forever. Problem reported by Florian Weimer.
Bug fix and patch suggestion by Sergei Golovan: configuring IPv6 nameservers did not work. His patch (as he warned) created many UDP sockets; one per nameserver. This has been fixed in the released version.
Improvement:
inet_res
is now EDNS0 capable. The current implementation is simple and does not probe and cache EDNS info for nameservers, which a fully capable implementation probably should do. EDNS has to be enabled via resolver configuration, and if a nameserver replies that it does not support EDNS,inet_res
falls back to a regular DNS query.Improvement: now
inet_res
automatically falls back to TCP if it gets a truncated answer from a nameserver.Warning: some of the ancient and exotic record types handled by
inet_res
andinet_dns
are not supported by current versions of BIND, so they could not be tested after the rewrite, with reasonable effort, e.g MD, MF, NULL, and SPF. The risk for bugs in these particular records is still low since their code is mostly shared with other tested record types.* POTENTIAL INCOMPATIBILITY *
Own Id: OTP-7955 Aux Id: OTP-7107 OTP-6852
A TCP socket with option
{packet,4}
could crash the emulator if it received a packet header with a very large size value (>2Gb). The same bug causederlang:decode_packet/3
to return faulty values. (Thanks to Georgos Seganos.)Own Id: OTP-8102
The file module has now a read_line/1 function similar to the io:get_line/2, but with byte oriented semantics. The function file:read_line/1 works for raw files as well, but for good performance it is recommended to use it together with the 'read_ahead' option for raw file access.
Own Id: OTP-8108
Kernel 2.13.2
Fixed Bugs and Malfunctions
A bug when doing io:get_line (among other calls) from a file opened with encoding other than latin1, causing false unicode errors to occur, is now corrected.
Own Id: OTP-7974
Improvements and New Features
Added functionality to get higher resolution timestamp from system. The erlang:now function returns a timestamp that's not always consistent with the actual operating system time (due to resilience against large time changes in the operating system). The function os:timestamp/0 is added to get a similar timestamp as the one being returned by erlang:now, but untouched by Erlangs time correcting and smoothing algorithms. The timestamp returned by os:timestamp is always consistent with the operating systems view of time, like the calendar functions for getting wall clock time, but with higher resolution. Example of usage can be found in the os manual page.
Own Id: OTP-7971
Kernel 2.13.1
Fixed Bugs and Malfunctions
Many concurrent calls to
os:cmd/1
will only block one scheduler thread at a time, making an smp emulator more responsive if the OS is slow forking processes.Own Id: OTP-7890 Aux Id: seq11219
Fixed hanging early RPC that did IO operation during node start.
Own Id: OTP-7903 Aux Id: seq11224
The error behavior of gen_tcp and gen_udp has been corrected. gen_tcp:connect/3,4 and gen_udp:send/4 now returns {error,eafnosupport} for conflicting destination address versus socket address family. Other corner cases for IP address string host names combined with not using the native (OS) resolver (which is not default) has also been changed to return {error,nxdomain} instead of {error,einval}. Those changes just may surprise old existing code. gen_tcp:listen/2 and gen_udp:open/2 now fails for conflicting local address versus socket address family instead of trying to use an erroneous address. Problem reported by Per Hedeland.
* POTENTIAL INCOMPATIBILITY *
Own Id: OTP-7929
Improvements and New Features
Several glitches and performance issues in the Unicode and I/O-system implementation of R13A have been corrected.
Own Id: OTP-7896 Aux Id: OTP-7648 OTP-7887
The unsupported DNS resolver client inet_res has now been improved to handle NAPTR queries.
Own Id: OTP-7925 Aux Id: seq11231
Kernel 2.13
Fixed Bugs and Malfunctions
The old Erlang DNS resolver inet_res has been corrected to handle TXT records with more than one character string. Patch courtesy of Geoff Cant.
Own Id: OTP-7588
When chunk reading a disk log opened in read_only mode, bad terms could crash the disk log process.
Own Id: OTP-7641 Aux Id: seq11090
gen_tcp:send()
did sometimes (only observed on Solaris) return{error,enotconn}
instead of the expected{error,closed}
as the peer socket had been explicitly closed.Own Id: OTP-7647
The gen_sctp option sctp_peer_addr_params, #sctp_paddrparams{address={IP,Port} was erroneously decoded in the inet driver. This bug has now been corrected.
Own Id: OTP-7755
Improvements and New Features
Erlang programs can now access STDERR on platforms where such a file descriptor is available by using the io_server 'standard_error', i.e. io:format(standard_error,"~s~n",[ErrorMessage]),
Own Id: OTP-6688
The format of the string returned by
erlang:system_info(system_version)
(as well as the first message when Erlang is started) has changed. The string now contains the both the OTP version number as well as the erts version number.Own Id: OTP-7649
As of this version, the global name server no longer supports nodes running Erlang/OTP R10B.
Own Id: OTP-7661
A
{nodedown, Node}
message passed by thenet_kernel:monitor_nodes/X
functionality is now guaranteed to be sent afterNode
has been removed from the result returned byerlang:nodes/Y
.Own Id: OTP-7725
The deprecated functions
erlang:fault/1
,erlang:fault/2
, andfile:rawopen/2
have been removed.* POTENTIAL INCOMPATIBILITY *
Own Id: OTP-7812
Nodes belonging to different independent clusters can now co-exist on the same host with the help of a new environment variable setting ERL_EPMD_PORT.
Own Id: OTP-7826
The copyright notices have been updated.
Own Id: OTP-7851
Kernel 2.12.5.1
Fixed Bugs and Malfunctions
When chunk reading a disk log opened in read_only mode, bad terms could crash the disk log process.
Own Id: OTP-7641 Aux Id: seq11090
Calling
gen_tcp:send()
from several processes on socket with optionsend_timeout
could lead to much longer timeout than specified. The solution is a new socket option{send_timeout_close,true}
that will do automatic close on timeout. Subsequent calls to send will then immediately fail due to the closed connection.Own Id: OTP-7731 Aux Id: seq11161
Kernel 2.12.5
Fixed Bugs and Malfunctions
The documentation of
rpc:pmap/3
has been corrected. (Thanks to Kirill Zaborski.)Own Id: OTP-7537
The listen socket used for the distributed Erlang protocol now uses the socket option 'reuseaddr', which is useful when you force the listen port number using kernel options 'inet_dist_listen_min' and 'inet_dist_listen_max' and restarts a node with open connections.
Own Id: OTP-7563
Fixed memory leak of unclosed TCP-ports. A gen_tcp:send() followed by a failing gen_tcp:recv() could in some cases cause the port to linger after being closed.
Own Id: OTP-7615
Improvements and New Features
Processes spawned using
proc_lib
(includinggen_server
and other library modules that useproc_lib
) no longer keep the entire argument list for the initial call, but only the arity.Also, if
proc_lib:spawn/1
is used to spawn a fun, the actual fun is not kept, but only module, function name, and arity of the function that implements the fun.The reason for the change is that keeping the initial fun (or a fun in an argument list), would prevent upgrading the code for the module. A secondary reason is that keeping the fun and function arguments could waste a significant amount of memory.
The drawback with the change is that the crash reports will provide less precise information about the initial call (only
Module:Function/Arity
instead ofModule:Function(Arguments)
). The functionproc_lib:initial_call/1
still returns a list, but each argument has been replaced with a dummy atom.Own Id: OTP-7531 Aux Id: seq11036
io:get_line/1
when reading from standard input is now substantially faster. There are also some minor performance improvements inio:get_line/1
when reading from any file opened in binary mode. (Thanks to Fredrik Svahn.)Own Id: OTP-7542
There is now experimental support for loading of code from archive files. See the documentation of
code
,init
,erl_prim_loader
andescript
for more info.The error handling of
escripts
has been improved.An
escript
may now set explicit arguments to the emulator, such as-smp enabled
.An
escript
may now contain a precompiled beam file.An
escript
may now contain an archive file containing one or more applications (experimental).The internal module
code_aux
has been removed.Own Id: OTP-7548 Aux Id: otp-6622
code:is_sticky/1
is now documented. (Thanks to Vlad Dumitrescu.)Own Id: OTP-7561
In the job control mode, the "s" and "r" commands now take an optional argument to specify which shell to start. (Thanks to Robert Virding.)
Own Id: OTP-7617
net_adm:world/0,1
could crash if called in an emulator that has not been started with either the-sname
or-name
option; now it will return an empty list. (Thanks to Edwin Fine.)Own Id: OTP-7618
Kernel 2.12.4
Fixed Bugs and Malfunctions
Large files are now handled on Windows, where the filesystem supports it.
Own Id: OTP-7410
Improvements and New Features
New BIF
erlang:decode_packet/3
that extracts a protocol packet from a binary. Similar to the socket option{packet, Type}
. Also documented the socket packet typehttp
and made it official. NOTE: The tuple format forhttp
packets sent from an active socket has been changed in an incompatible way.* POTENTIAL INCOMPATIBILITY *
Own Id: OTP-7404
Setting the
{active,once}
for a socket (using inets:setopts/2) is now specially optimized (because the{active,once}
option is typically used much more frequently than other options).Own Id: OTP-7520
Kernel 2.12.3
Fixed Bugs and Malfunctions
SCTP_ADDR_CONFIRMED events are now handled by gen_sctp.
Own Id: OTP-7276
When leaving a process group with
pg2:leave/2
the process was falsely assumed to be a member of the group. This bug has been fixed.Own Id: OTP-7277
In the Erlang shell, using up and down arrow keys, the wrong previous command could sometimes be retrieved.
Own Id: OTP-7278
The documentation for
erlang:trace/3
has been corrected.Own Id: OTP-7279 Aux Id: seq10927
In the SMP emulator, there was small risk that
code:purge(Mod)
would kill a process that was running code inMod
and unload the moduleMod
before the process had terminated.code:purge(Mod)
now waits for confirmation (usingerlang:monitor/2
) that the process has been killed before proceeding.Own Id: OTP-7282
zlib:inflate
failed when the size of the inflated data was an exact multiple of the internal buffer size (4000 bytes by default).Own Id: OTP-7359
Improvements and New Features
Additional library directories can now be specified in the environment variable ERL_LIBS. See the manual page for the
code
module. (Thanks to Serge Aleynikov.)Own Id: OTP-6940
crypto and zlib drivers improved to allow concurrent smp access.
Own Id: OTP-7262
There is a new function
init:stop/1
which can be used to shutdown the system cleanly AND generate a non-zero exit status or crash dump. (Thanks to Magnus Froberg.)Own Id: OTP-7308
The
hide
option foropen_port/2
is now documented. (Thanks to Richard Carlsson.)Own Id: OTP-7358
Kernel 2.12.2.1
Improvements and New Features
os:cmd/1
on unix platforms now use/bin/sh
as shell instead of looking forsh
in thePATH
environment.Own Id: OTP-7283
Kernel 2.12.2
Fixed Bugs and Malfunctions
A bug caused by a race condition involving
disk_log
andpg2
has been fixed.Own Id: OTP-7209 Aux Id: seq10890
The beta testing module
gen_sctp
now supports active mode as stated in the documentation. Active mode is still rather untested, and there are some issues about what should be the right semantics forgen_sctp:connect/5
. In particular: should it be blocking or non-blocking or choosable. There is a high probability it will change semantics in a (near) future patch.Try it, give comments and send in bug reports!
Own Id: OTP-7225
Improvements and New Features
erlang:system_info/1
now accepts thelogical_processors
, anddebug_compiled
arguments. For more info see the,erlang
documentation.The scale factor returned by
test_server:timetrap_scale_factor/0
is now also effected if the emulator uses a larger amount of scheduler threads than the amount of logical processors on the system.Own Id: OTP-7175
Updated the documentation for
erlang:function_exported/3
andio:format/2
functions to no longer state that those functions are kept mainly for backwards compatibility.Own Id: OTP-7186
A process executing the
processes/0
BIF can now be preempted by other processes during its execution. This in order to disturb the rest of the system as little as possible. The returned result is, of course, still a consistent snapshot of existing processes at a time during the call toprocesses/0
.The documentation of the
processes/0
BIF and theis_process_alive/1
BIF have been updated in order to clarify the difference between an existing process and a process that is alive.Own Id: OTP-7213
tuple_size/1
andbyte_size/1
have been substituted forsize/1
in the documentation.Own Id: OTP-7244
Kernel 2.12.1.2
Improvements and New Features
The
{allocator_sizes, Alloc}
andalloc_util_allocators
arguments are now accepted byerlang:system_info/1
. For more information see theerlang
documentation.Own Id: OTP-7167
Kernel 2.12.1.1
Fixed Bugs and Malfunctions
Fixed a problem in group that could cause the ssh server to lose answers or hang.
Own Id: OTP-7185 Aux Id: seq10871
Kernel 2.12.1
Fixed Bugs and Malfunctions
file:read/2 and file:consult_stream/1,3 did not use an empty prompt on I/O devices. This bug has now been corrected.
Own Id: OTP-7013
The sctp driver has been updated to work against newer lksctp packages e.g 1.0.7 that uses the API spelling change adaption -> adaptation. Older lksctp (1.0.6) still work. The erlang API in gen_sctp.erl and inet_sctp.hrl now spells 'adaptation' regardless of the underlying C API.
* POTENTIAL INCOMPATIBILITY *
Own Id: OTP-7120
Improvements and New Features
The documentation has been updated so as to reflect the last updates of the Erlang shell as well as the minor modifications of the control sequence
p
of theio_lib
module.Superfluous empty lines have been removed from code examples and from Erlang shell examples.
Own Id: OTP-6944 Aux Id: OTP-6554, OTP-6911
tuple_size/1
andbyte_size/1
have been substituted forsize/1
.Own Id: OTP-7009
Kernel 2.12
Fixed Bugs and Malfunctions
A bug for raw files when reading 0 bytes returning 'eof' instead of empty data has been corrected.
Own Id: OTP-6291 Aux Id: OTP-6967
A bug in gen_udp:fdopen reported by David Baird and also found by Dialyzer has been fixed.
Own Id: OTP-6836 Aux Id: OTP-6594
Calling
error_logger:tty(true)
multiple times does not give multiple error log printouts.Own Id: OTP-6884 Aux Id: seq10767
The global name server now ignores
nodeup
messages when the command line flag-connect_all false
has been used. (Thanks to Trevor Woollacott.)Own Id: OTP-6931
file:write_file/3, file:write/2 and file:read/2 could crash (contrary to documentation) for odd enough file system problems, e.g write to full file system. This bug has now been corrected.
In this process the file module has been rewritten to produce better error codes. Posix error codes now originate from the OS file system calls or are generated only for very similar causes (for example 'enomem' is generated if a memory allocation fails, and 'einval' is generated if the file handle in Erlang is a file handle but currently invalid).
More Erlang-ish error codes are now generated. For example
{error,badarg}
is now returned fromfile:close/1
if the argument is not of a file handle type. See file(3).The possibility to write a single byte using
file:write/2
instead of a list or binary of one byte, contradictory to the documentation, has been removed.* POTENTIAL INCOMPATIBILITY *
Own Id: OTP-6967 Aux Id: OTP-6597 OTP-6291
Monitor messages produced by the system monitor functionality, and garbage collect trace messages could contain erroneous heap and/or stack sizes when the actual heaps and/or stacks were huge.
As of erts version 5.6 the
large_heap
option toerlang:system_monitor/[1,2]
has been modified. The monitor message is sent if the sum of the sizes of all memory blocks allocated for all heap generations is equal to or larger than the specified size. Previously the monitor message was sent if the memory block allocated for the youngest generation was equal to or larger than the specified size.* POTENTIAL INCOMPATIBILITY *
Own Id: OTP-6974 Aux Id: seq10796
inet:getopts/2
returned random values on Windows Vista.Own Id: OTP-7003
Improvements and New Features
Minor documentation corrections for file:pread/2 and file:pread/3.
Own Id: OTP-6853
The deprecated functions
file:file_info/1
,init:get_flag/1
,init:get_flags/0
, andinit:get_args/0
have been removed.* POTENTIAL INCOMPATIBILITY *
Own Id: OTP-6886
Contract directives for modules in Kernel and STDLIB.
Own Id: OTP-6895
The functions io:columns/0, io:columns/1, io:rows/0 and io:rows/1 are added to allow the user to get information about the terminal geometry. The shell takes some advantage of this when formatting output. For regular files and other io-devices where height and width are not applicable, the functions return {error,enotsup}.
Potential incompatibility: If one has written a custom io-handler, the handler has to either return an error or take care of io-requests regarding terminal height and width. Usually that is no problem as io-handlers, as a rule of thumb, should give an error reply when receiving unknown io-requests, instead of crashing.
* POTENTIAL INCOMPATIBILITY *
Own Id: OTP-6933
The undocumented and unsupported functions
inet:ip_to_bytes/1
,inet:ip4_to_bytes/1
,inet:ip6_to_bytes/1
, andinet:bytes_to_ip6/16
have been removed.Own Id: OTP-6938
Added new checksum combine functions to
zlib
. And fixed a bug inzlib:deflate
. Thanks Matthew Dempsky.Own Id: OTP-6970
The
spawn_monitor/1
andspawn_monitor/3
BIFs are now auto-imported (i.e. they no longer need anerlang:
prefix).Own Id: OTP-6975
All functions in the
code
module now fail with an exception if they are called with obviously bad arguments, such as a tuple when an atom was expected. Some functions now also fail for undocumented argument types (for instance,ensure_loaded/1
now only accepts an atom as documented; it used to accept a string too).Dialyzer will generally emit warnings for any calls that use undocumented argument types. Even if the call happens to still work in R12B, you should correct your code. A future release will adhere to the documentation.
* POTENTIAL INCOMPATIBILITY *
Own Id: OTP-6983
Kernel 2.11.5.2
Fixed Bugs and Malfunctions
The kernel parameter dist_auto_connect once could fail to block a node if massive parallel sends were issued during a transient failure of network communication
Own Id: OTP-6893 Aux Id: seq10753
Kernel 2.11.5.1
Fixed Bugs and Malfunctions
The internal (rarely used) DNS resolver has been modified to not use the domain search list when asked to resolve an absolute name; a name with a terminating dot. There was also a bug causing it to create malformed DNS queries for absolute names that has been corrected, correction suggested by Scott Lystig Fritchie. The code has also been corrected to look up cached RRs in the same search order as non-cached, now allows having the root domain among the search domains, and can now actually do a zone transfer request.
* POTENTIAL INCOMPATIBILITY *
Own Id: OTP-6806 Aux Id: seq10714 EABln35459
zlib:close/1 would leave an EXIT message in the message queue if the calling process had the trap_exit flag enabled.
Own Id: OTP-6811
Improvements and New Features
The documentation of
process_flag(priority, Level)
has been updated, see theerlang
documentation.Own Id: OTP-6745 Aux Id: OTP-6715
Kernel 2.11.5
Fixed Bugs and Malfunctions
The shell has been updated to fix the following flaws: Shell process exit left you with an unresponsive initial shell if not using oldshell. Starting a restricted shell with a nonexisting callback module resulted in a shell where no commands could be used, not even init:stop/0. Fun's could not be used as parameters to local shell functions (in shell_default or user_default) when restricted_shell was active.
Own Id: OTP-6537
The undocumented feature gen_tcp:fdopen/2 was broken in R11B-4. It is now fixed again.
Own Id: OTP-6615
Corrected cancellation of timers in three places in the inet_res module. (Problem found by Dialyzer.)
Own Id: OTP-6676
Improvements and New Features
Corrected protocol layer flue for socket options SO_LINGER, SO_SNDBUF and SO_RCVBUF, for SCTP.
Own Id: OTP-6625 Aux Id: OTP-6336
The behaviour of the inet option {active,once} on peer close is improved and documented.
Own Id: OTP-6681
The inet option send_timeout for connection oriented sockets is added to allow for timeouts in communicating send requests to the underlying TCP stack.
Own Id: OTP-6684 Aux Id: seq10637 OTP-6681
Minor Makefile changes.
Own Id: OTP-6689 Aux Id: OTP-6742
The documentation of
process_flag(priority, Level)
has been updated, see theerlang
documentation.Own Id: OTP-6715
Kernel 2.11.4.2
Improvements and New Features
process_flag/2 accepts the new flag
sensitive
.Own Id: OTP-6592 Aux Id: seq10555
Kernel 2.11.4.1
Fixed Bugs and Malfunctions
A bug in gen_udp:open that broke the 'fd' option has been fixed.
Own Id: OTP-6594 Aux Id: seq10619
Kernel 2.11.4
Fixed Bugs and Malfunctions
Added a warning to the documentation for the
error_logger
functionserror_msg/1,2
,warning_msg/1,2
andinfo_msg/1,2
that calling these function with bad arguments can crash the standard event handler.Own Id: OTP-4575 Aux Id: seq7693
A bug in
inet_db
concerning getting the resolver optionretry
has been corrected.Own Id: OTP-6380 Aux Id: seq10534
Names registered by calling
global:register_name()
orglobal:re_register_name()
were not always unregistered when the registering or registered process died. This bug has been fixed.Own Id: OTP-6428
When setting the kernel configuration parameter
error_logger
tofalse
, the documentation stated that "No error logger handler is installed". This is true, but error logging is not turned off, as the initial, primitive error logger event handler is kept, printing raw event messages to tty.Changing this behavior can be viewed as a backward incompatible change. Instead a new value
silent
for the configuration parameter has been added, which ensures that error logging is completely turned off.Own Id: OTP-6445
Clarified the documentation for
code:lib_dir/1
andcode:priv_dir/1
. The functions traverse the names of the code path, they do not search the actual directories.Own Id: OTP-6466
io:setopts
returned{error,badarg}
, when called with only anexpand_fun
argument. (Thanks to igwan.)Own Id: OTP-6508
Improvements and New Features
An interface towards the SCTP Socket API Extensions has been implemented.It is an Open Source patch courtesy of Serge Aleynikov and Leonid Timochouk. The Erlang code parts has been adapted by the OTP team, changing the Erlang API somewhat.
The Erlang interface consists of the module
gen_sctp
and an include file-include_lib("kernel/include/inet_sctp.hrl").
for option record definitions. Thegen_sctp
module is documented.The delivered Open Source patch, before the OTP team rewrites, was written according to http://tools.ietf.org/html/draft-ietf-tsvwg-sctpsocket-13 and was claimed to work fine, tested on Linux Fedora Core 5.0 (kernel 2.6.15-2054 or later) and on Solaris 10 and 11. The OTP team rewrites used the same standard document but might have accidentally broken some functionality. If so, it will soon be patched to working state. The tricky parts in C and the general design has essentially not changed. During the rewrites the code was hand tested on SuSE Linux Enterprise Server 10, and briefly on Solaris 10. Feedbach on code and docs is very much appreciated.
The SCTP interface is in beta state. It has only been hand tested and has no automatic test suites in OTP meaning everything is most certainly not tested. Socket active mode is broken. IPv6 is not tested. The documentation has been reworked due to the API changes, but has not been proofread after this.
Thank you from the OTP team to Serge Aleynikov and Leonid Timochouk for a valuable contribution. We hope we have not messed it up too much.
Own Id: OTP-6336
A
{minor_version,Version}
option is now recognized byterm_to_binary/2
. {minor_version,1} will cause floats to be encoded in an exact and more space-efficient way compared to the previous encoding.Own Id: OTP-6434
Monitoring of nodes has been improved. Now the following properties apply to
net_kernel:monitor_nodes/[1,2]
:nodeup
messages will be delivered before delivery of any message from the remote node passed through the newly established connection.nodedown
messages will not be delivered until all messages from the remote node that have been passed through the connection have been delivered.- Subscriptions can also be made before the
net_kernel
server has been started.
Own Id: OTP-6481
Setting and getting socket options in a "raw" fashion is now allowed. Using this feature will inevitably produce non portable code, but will allow setting ang getting arbitrary uncommon options on TCP stacks that do have them.
Own Id: OTP-6519
Dialyzer warnings have been eliminated.
Own Id: OTP-6523
The documentation for
file:delete/1
andfile:set_cwd/1
has been updated to clarify what happens if the input arguments are of an incorrect type.Own Id: OTP-6535
Kernel 2.11.3.1
Fixed Bugs and Malfunctions
An erroneous packet size could be used for the first messages passed through a newly established connection between two Erlang nodes. This could cause messages to be discarded, or termination of the connection.
Own Id: OTP-6473
Kernel 2.11.3
Fixed Bugs and Malfunctions
On Unix, the
unix:cmd/1
function could leave an 'EXIT' message in the message queue for the calling process That problem was more likely to happen in an SMP emulator.Own Id: OTP-6368
Improvements and New Features
More interfaces are added in erl_ddll, to support different usage scenarios.
Own Id: OTP-6307 Aux Id: OTP-6234
Locks set by calling
global:set_lock()
were not always deleted when the locking process died. This bug has been fixed.Own Id: OTP-6341 Aux Id: seq10445
Kernel 2.11.2
Fixed Bugs and Malfunctions
Behavior in case of disappeared nodes when using he dist_auto_connect once got changed in R11B-1. The timeouts regarding normal distributed operations is now reverted to the old (pre R11B-1).
Own Id: OTP-6258 Aux Id: OTP-6200, seq10449
Start-up problems for the internal process used by the
inet:gethostbyname()
functions were eliminated. If the internal process (inet_gethost_native
) had not previously been started, and if several processes at the same time called one of theinet:gethostbyname()
functions, the calls could fail.Own Id: OTP-6286
Improvements and New Features
Code cleanup: the old internal obsolete file_server has been removed. It was only used when communicating with R7 and older nodes.
Own Id: OTP-6245
Trying to open a non-existent or badly formed disk log no longer results in a crash report. In particular,
ets:file2tab/1
reports no error when the argument is not a well-formed disk log file. (The return value has not been changed, it is still an error tuple.)Own Id: OTP-6278 Aux Id: seq10421
There are new BIFs
erlang:spawn_monitor/1,3
, and the new optionmonitor
forspawn_opt/2,3,4,5
.The
observer_backend
module has been updated to handle the new BIFs.Own Id: OTP-6281
To help Dialyzer find more bugs, many functions in the Kernel and STDLIB applications now only accept arguments of the type that is documented.
For instance, the functions
lists:prefix/2
andlists:suffix/2
are documented to only accept lists as their arguments, but they actually accepted anything and returnedfalse
. That has been changed so that the functions cause an exception if one or both arguments are not lists.Also, the
string:strip/3
function is documented to take a character argument that is a character to strip from one or both ends of the string. Given a list instead of a character, it used to do nothing, but will now cause an exception.Dialyzer will find most cases where those functions are passed arguments of the wrong type.
* POTENTIAL INCOMPATIBILITY *
Own Id: OTP-6295
Kernel 2.11.1.1
Improvements and New Features
There is now an option read_packets for UDP sockets that sets the maximum number of UDP packets that will be read for each invocation of the socket driver.
Own Id: OTP-6249 Aux Id: seq10452
Kernel 2.11.1
Fixed Bugs and Malfunctions
In R11B-0, the erl_ddll server process is always started. Despite that, the configuration parameter
start_ddll
for the Kernel application was still obeyed, which would cause the erl_ddll server to be started TWICE (and the system shutting down as a result). In this release,start_ddll
is no longer used and its documentation has been removed.Own Id: OTP-6163
The kernel option {dist_auto_connect,once} could block out nodes that had never been connected, causing persistent partitioning of networks. Furthermore, partial restarts of networks could cause inconsistent global name databases. Both problems are now solved.
Own Id: OTP-6200 Aux Id: seq10377
Improvements and New Features
Late arriving tcp_closed and udp_closed messages are now removed from the message queue of a process calling gen_tcp:close/1, gen_udp:close/1, and inet:close/1.
Own Id: OTP-6197
Kernel 2.11
Fixed Bugs and Malfunctions
When repairing a disk log with a corrupt index file (caused by for instance a hard disk failure) the old contents of the index file is kept unmodified. This will make repeated attempts to open the disk log fail every time.
Own Id: OTP-5558 Aux Id: seq9823
Previously
unlink/1
anderlang:demonitor/2
behaved completely asynchronous. This had one undesirable effect, though. You could never know when you were guaranteed not to be affected by a link that you had unlinked or a monitor that you had demonitored.The new behavior of
unlink/1
anderlang:demonitor/2
can be viewed as two operations performed atomically. Asynchronously send an unlink signal or a demonitor signal, and ignore any future results of the link or monitor.NOTE: This change can cause some obscure code to fail which previously did not. For example, the following code might hang:
Mon = erlang:monitor(process, Pid), %% ... exit(Pid, bang), erlang:demonitor(Mon), receive {'DOWN', Mon, process, Pid, _} -> ok %% We were previously guaranteed to get a down message %% (since we exited the process ourself), so we could %% in this case leave out: %% after 0 -> ok end,
* POTENTIAL INCOMPATIBILITY *
Own Id: OTP-5772
The behavior when an application fails to start and possibly causes the runtime system to halt has been cleaned up, including fixing some minor bugs.
application_controller
should now always terminate with a non-nested string, meaning the slogan in anerl_crash.dump
should always be easy to read.init
now makes sure that the slogan passed toerlang:halt/1
does not exceed the maximum allowed length.Redundant calls to
list_to_atom/1
has been removed from the primitiveerror_logger
event handler. (Thanks Serge Aleynikov for pointing this out).The changes only affects the contents of the error messages and crashdump file slogan.
Own Id: OTP-5964
The
erl_ddll
server is now started when OTP is started and placed under the Kernel supervisor. This fixes several minor issues. It used to be started on demand.The documentation for the
start
andstop
functions in theerl_ddll
module has been removed, as those functions are not meant to be used by other applications.Furthermore, the
erl_ddll:stop/1
function no longer terminates theerl_ddll
server, as that would terminate the entire runtime system.Own Id: OTP-6033
Improvements and New Features
Removed some unused functions from
application_master
.Own Id: OTP-3889
Global no longer allows the registration of a process under more than one name. If the old (buggy) behavior is desired the Kernel application variable
global_multi_name_action
can be given the valueallow
.Own Id: OTP-5640 Aux Id: OTP-5603
The (slightly misleading) warnings that was shown when the
erlang.erl
file was compiled has been eliminated.Own Id: OTP-5947
The
auth
module API is deprecated.Own Id: OTP-6037
Added
erlang:demonitor/2
, making it possible to at the same time flush a received'DOWN'
message, if there is one. Seeerlang
.Own Id: OTP-6100 Aux Id: OTP-5772
Kernel 2.10.13
Fixed Bugs and Malfunctions
Large files (more than 2 GBytes) are now handled on Solaris 8.
Own Id: OTP-5849 Aux Id: seq10157
During startup, a garbage
{'DOWN', ...}
message was left byinet_gethost_native
, that caused problems for the starting code server.Own Id: OTP-5978 Aux Id: OTP-5974
Improvements and New Features
global
now makes several attempts to connect nodes when maintaining the fully connected network. More than one attempt is sometimes needed under very heavy load.Own Id: OTP-5889
erl_epmd
now explicitly sets the timeout toinfinity
when callinggen_server:call
. The old timeout of 15 seconds could time out under very heavy load.Own Id: OTP-5959
Corrected the start of code server to use reference-tagged tuples to ensure that an unexpected message sent to the parent process does not cause a halt of the system. Also removed the useless
start/*
functions in bothcode.erl
andcode_server.erl
and no longer exports theinit
function fromcode_server.erl
.Own Id: OTP-5974 Aux Id: seq10243, OTP-5978
Kernel 2.10.12
Fixed Bugs and Malfunctions
A bug in
global
has been fixed: the locker process addednonode@nohost
to the list of nodes to lock. This could happen before any nodes got known to the global name server. Depending on net configuration the symptom was a delay.Own Id: OTP-5792 Aux Id: OTP-5563
If an
.app
file is missing, the error reason returned byapplication:load/1
has been corrected to{"no such file or directory", "FILE.app"}
, instead of the less informative{"unknown POSIX error","FILE.app"}
.Own Id: OTP-5809
Bug fixes:
disk_log:accessible_logs/0
no longer reports allpg2
process groups as distributed disk logs;disk_log:pid2name/1
did not recognize processes of distributed disk logs.Own Id: OTP-5810
The functions
file:consult/1
,file:path_consult/2
,file:eval/1,2
,file:path_eval/2,3
,file:script/1,2
,file:path_script/2,3
now return correct line numbers in error tuples.Own Id: OTP-5814
If there were user-defined variables in the boot script, and their values were not provided using the
-boot_var
option, the emulator would refuse to start with a confusing error message. Corrected to show a clear, understandable message.The
prim_file
module was modified to not depend on thelists
module, to make it possible to start the emulator using a user-defined loader. (Thanks to Martin Bjorklund.)Own Id: OTP-5828 Aux Id: seq10151
Minor corrections in the description of open modes. (Thanks to Richard Carlsson.)
Own Id: OTP-5856
Improvements and New Features
application_controller
now terminates with the actual error reason, instead ofshutdown
. This means that the crash dump now should be somewhat more informative, in the case where the runtime system is terminated due to an error in an application.Example: If the (permanent) application
app1
fails to start, the slogan now will be: "Kernel pid terminated (application_controller) ({application_start_failure,app1,{shutdown, {app1,start,[normal,[]]}}})
"rather than the previous "
Kernel pid terminated (application_controller) (shutdown)
".Own Id: OTP-5811
Kernel 2.10.11.1
Fixed Bugs and Malfunctions
Timers could sometimes timeout too early. This bug has now been fixed.
Automatic cancellation of timers created by
erlang:send_after(Time,
pid(), Msg), anderlang:start_timer(Time,
pid(), Msg) has been introduced. Timers created with the receiver specified by a pid, will automatically be cancelled when the receiver exits. For more information see theerlang
man page.In order to be able to maintain a larger amount of timers without increasing the maintenance cost, the internal timer wheel and bif timer table have been enlarged.
Also a number of minor bif timer optimizations have been implemented.
Own Id: OTP-5795 Aux Id: OTP-5090, seq8913, seq10139, OTP-5782
Improvements and New Features
Documentation improvements:
- documentation for
erlang:link/1
corrected- command line flag
-code_path_cache
added-
erl
command line flags clarifications-
net_kernel
clarificationsOwn Id: OTP-5847
Kernel 2.10.11
Fixed Bugs and Malfunctions
Several bug fixes and improvements in the global name registration facility (see
global
):- the name resolving procedure did not always unlink no longer registered processes;
- the global name could sometimes hang when a
nodedown
was immediately followed by anodeup
; - global names were not always unregistered when a node went down;
- it is now possible to set and delete locks at the same time as the global name server is resolving names--the handling of global locks has been separated from registration of global names;
As of this version,
global
no longer supports nodes running Erlang/OTP R7B or earlier.* POTENTIAL INCOMPATIBILITY *
Own Id: OTP-5563
The functions
global:set_lock/3
andglobal:trans/4
now accept the value0
(zero) of theRetries
argument.Own Id: OTP-5737
The
inet:getaddr(Addr, Family)
no longer validates theAddr
argument if it is a 4 or 8 tuple containing the IP address, except for the size of the tuple and that it contains integers in the correct range.The reason for the change is that validation could cause the following sequence of calls to fail:
{ok,Addr} = inet:getaddr(localhost, inet6), gen_tcp:connect(Addr, 7, [inet6])
Own Id: OTP-5743
Improvements and New Features
The previously undocumented and UNSUPPORTED
zlib
module has been updated in an incompatible way and many bugs have been corrected. It is now also documented.* POTENTIAL INCOMPATIBILITY *
Own Id: OTP-5715
Added
application
interface functionswhich_applications/1
,set_env/4
andunset_env/3
, which take an additionalTimeout
argument. To be used in situations where the standard gen_server timeout (5000ms) is not adequate.Own Id: OTP-5724 Aux Id: seq10083
Improved documentation regarding synchronized start of applications with included applications (using start phases and
application_starter
).Own Id: OTP-5754
New socket options
priority
andtos
for platforms that support them (currently only Linux).Own Id: OTP-5756
The global name server has been optimized when it comes to maintaining a fully connected network.
Own Id: OTP-5770
Kernel 2.10.10.1
Fixed Bugs and Malfunctions
The native resolver has gotten an control API for extended debugging and soft restart. It is:
inet_gethost_native:control(Control)
Control = {debug_level,Level} | soft_restart
Level = integer() in the range 0-4
.Own Id: OTP-5751 Aux Id: EABln25013
Kernel 2.10.10
Fixed Bugs and Malfunctions
If several processes (at the same node) simultaneously tried to start the same distributed application, this could lead to
application:start
returning an erroneous value, or even hang.Own Id: OTP-5606 Aux Id: seq9838
Improvements and New Features
The manual pages for most of the Kernel and some of the STDLIB modules have been updated, in particular regarding type definitions.
The documentation of the return value for
erts:info/1
has been corrected.The documentation for
erlang:statistics/1
now lists all possible arguments.Own Id: OTP-5360
When the native resolver fails a
gethostbyaddr
lookup,nxdomain
should be returned. There should be no attempt to fallback on a routine that succeeds if only the syntax of the IP address is valid. This has been fixed.Own Id: OTP-5598 Aux Id: OTP-5576
Replaced some tuple funs with the new
fun M:F/A
construct.The high-order functions in the
lists
module no longer accept bad funs under any circumstances. 'lists:map(bad_fun, [])
' used to return '[]
' but now causes an exception.Unused, broken compatibility code in the
ets
module was removed. (Thanks to Dialyzer.)Eliminated 5 discrepancies found by Dialyzer in the Appmon application.
Own Id: OTP-5633
The possibility to have comments following the list of tuples in a config file (file specified with the
-config
flag) has been added.Own Id: OTP-5661 Aux Id: seq10003
Kernel 2.10.9
Fixed Bugs and Malfunctions
'
erl -config sys.config
' would fail to start if thesys.config
file did not contain any whitespace at all after the dot. (Thanks to Anders Nygren.)Own Id: OTP-5543
A bug regarding tcp sockets which results in hanging
gen_tcp:send/2
has been corrected. To encounter this bug you needed one process that read from a socket, one that wrote more date than the reader read out so the sender got suspended, and then the reader closed the socket. (Reported and diagnosed by Alexey Shchepin.)Corrected a bug in the (undocumented and unsupported) option
{packet,http}
forgen_tcp.
(Thanks to Claes Wikstrom and Luke Gorrie.)Updated the documentation regarding the second argument to
gen_tcp:recv/2
, theLength
to receive.Own Id: OTP-5582 Aux Id: seq9839
Improvements and New Features
At startup, the Erlang resolver hosts table was used to look up the name of the local (and possibly stand alone) host. This was incorrect. The configured resolver method is now used for this purpose.
Own Id: OTP-5393
The
erlang:port_info/1
BIF is now documented. Minor corrections of the documentation forerlang:port_info/2
.Added a note to the documentation of the
math
module that all functions are not available on all platforms.Added more information about the
+c
option in theerl
man page in the ERTS documentation.Own Id: OTP-5555
The new
fun M:F/A
construct creates a fun that refers to the latest version ofM:F/A.
This syntax is meant to replace tuple funs{M,F}
which have many problems.The new type test
is_function(Fun,A)
(which may be used in guards) test whetherFun
is a fun that can be applied withA
arguments. (Currently,Fun
can also be a tuple fun.)Own Id: OTP-5584
According to the documentation
global
implements the equivalent ofregister/2
, which returnsbadarg
if a process is already registered. As it turns out there is no check inglobal
if a process is registered under more than one name. If some process is accidentally or by design given several names, it is possible that the name registry becomes inconsistent due to the way the resolve function is called when name clashes are discovered (seeregister_name/3
inglobal
).In OTP R11B
global
will not allow the registration of a process under more than one name. To help finding code whereno
will be returned, a Kernel application variable,global_multi_name_action
, is hereby introduced. Depending on its value (info
,warning
, orerror
), messages are sent to the error logger whenglobal
discovers that some process is given more than one name. The variable only affects the node where it is defined.Own Id: OTP-5603
Kernel 2.10.8
Improvements and New Features
In case of a DNS lookup loop,
inet_db:getbyname
ends up building an infinite list. This has been fixed.Own Id: OTP-5449
When doing an
inet6
name lookup on an IPv4 address it was possible to get an address on IPv4 format back. This has been corrected. Some other minor inconsistencies regarding IPv6 name lookup have also been corrected.Own Id: OTP-5576
Kernel 2.10.7
Fixed Bugs and Malfunctions
Under certain circumstances the
net_kernel
could emit spurious nodedown messages. This bug has been fixed.Own Id: OTP-5396
Removed description of the
keep_zombies
configuration parameter in thekernel
man page.Own Id: OTP-5497
Improvements and New Features
Eliminated Dialyzer warnings (caused by dead code) in the
init
andprim_file
modules.Own Id: OTP-5496
inet_config
now also checks the environment variableERL_INETRC
for a possible user configuration file. See the ERTS User's Guide for details.Own Id: OTP-5512
Kernel 2.10.6
Improvements and New Features
The
c
option for the+B
flag has been introduced which makes it possible to use Ctrl-C (Ctrl-Break on Windows) to interrupt the shell process rather than to invoke the emulator break handler. All new+B
options are also supported on Windows (werl) as of now. Furthermore, Ctrl-C on Windows has now been reserved for copying text (what Ctrl-Ins was used for previously). Ctrl-Break should be used for break handling. Lastly, the documentation of the system flags has been updated.Own Id: OTP-5388
The possibility to start the Erlang shell in parallel with the rest of the system was reintroduced for backwards compatibility in STDLIB 1.13.1. The flag to be used for this is now called
async_shell_start
and has been documented. New shells started from the JCL menu are not synchronized withinit
anymore. This makes it possible to start a new shell (e.g. for debugging purposes) even if the initial shell has not come up.Own Id: OTP-5406 Aux Id: OTP-5218
Kernel 2.10.5
Fixed Bugs and Malfunctions
Documentation for
erlang:binary_to_float/1
deleted. The BIF itself was removed several releases ago.Updated documentation for
apply/2
andapply/3
.Own Id: OTP-5391
Improvements and New Features
net_kernel:monitor_nodes/2
which takes a flag and an option list has been added. By use ofnet_kernel:monitor_nodes/2
one can subscribe fornodeup/nodedown
messages with extra information. It is now possible to monitor hidden nodes, and getnodedown
reason. See thenet_kernel
documentation for more information.Own Id: OTP-5374
Kernel 2.10.4
Fixed Bugs and Malfunctions
The application master for an application now terminates the application faster, which reduces the risk for timeouts in other parts of the system.
Own Id: OTP-5363 Aux Id: EABln19084
A BIF
erlang:raise/3
has been added. See the manual for details. It is intended for internal system programming only, advanced error handling.Own Id: OTP-5376 Aux Id: OTP-5257
Kernel 2.10.3
Improvements and New Features
With the
-eval
flag (erl -eval Expr
), an arbitrary expression can be evaluated during system initialization. This is documented ininit
.Own Id: OTP-5260
The unsupported and undocumented modules
socks5
,socks5_auth
,socks5_tcp
, andsocks5_udp
have been removed.Own Id: OTP-5266
Kernel 2.10.1
Fixed Bugs and Malfunctions
The Pman 'trace shell' functionality was broken and has now been fixed. Furthermore, Pman could not correctly find the pid of the active shell if more than one shell process was running on the node. This has also been corrected.
Own Id: OTP-5191
The documentation for the
auth:open/1
function which no longer exists has been removed. (Thanks to Miguel Barreiro.)Own Id: OTP-5208
Corrected the
crc32/3
function in the undocumented and unsupportedzlib
module.Own Id: OTP-5227
Improvements and New Features
You can now start Erlang with the
-rsh
flag which gives you a remote initial shell instead of a local one. Example:erl -sname this_node -rsh other_node@other_host
Own Id: OTP-5210
If
/etc/hosts
specified two hosts with the same IP address (on separate lines), only the last host would be registered by inet_db during inet configuration. This has been corrected now so that both aliases are registered with the same IP address.Own Id: OTP-5212 Aux Id: seq7128
The documentation for BIFs that take I/O lists have been clarified. Those are
list_to_binary/1
,port_command/2
,port_control/3
.Documentation for all
is_*
BIFs (such asis_atom/1
) has been added.Removed the documentation for
erlang:float_to_binary/2
which was removed from the run-time system several releases ago.Own Id: OTP-5222