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|
Inital Release: OTP 26.0
Git Tag: OTP-26.0
Date: 2023-04-12
Trouble Report Id: OTP-14771, OTP-14835, OTP-15597, OTP-15903,
OTP-16607, OTP-17771, OTP-17932, OTP-18016,
OTP-18029, OTP-18053, OTP-18126, OTP-18131,
OTP-18135, OTP-18137, OTP-18140, OTP-18141,
OTP-18150, OTP-18159, OTP-18167, OTP-18168,
OTP-18176, OTP-18185, OTP-18188, OTP-18204,
OTP-18206, OTP-18209, OTP-18210, OTP-18211,
OTP-18221, OTP-18225, OTP-18226, OTP-18227,
OTP-18228, OTP-18230, OTP-18231, OTP-18235,
OTP-18236, OTP-18237, OTP-18238, OTP-18246,
OTP-18247, OTP-18248, OTP-18253, OTP-18254,
OTP-18259, OTP-18261, OTP-18271, OTP-18272,
OTP-18274, OTP-18275, OTP-18276, OTP-18277,
OTP-18278, OTP-18279, OTP-18282, OTP-18285,
OTP-18286, OTP-18287, OTP-18297, OTP-18300,
OTP-18301, OTP-18303, OTP-18305, OTP-18309,
OTP-18310, OTP-18312, OTP-18318, OTP-18327,
OTP-18331, OTP-18334, OTP-18335, OTP-18337,
OTP-18338, OTP-18340, OTP-18342, OTP-18344,
OTP-18350, OTP-18354, OTP-18355, OTP-18359,
OTP-18360, OTP-18361, OTP-18364, OTP-18367,
OTP-18369, OTP-18377, OTP-18385, OTP-18389,
OTP-18405, OTP-18410, OTP-18413, OTP-18414,
OTP-18419, OTP-18423, OTP-18424, OTP-18425,
OTP-18430, OTP-18431, OTP-18435, OTP-18438,
OTP-18439, OTP-18440, OTP-18441, OTP-18442,
OTP-18444, OTP-18445, OTP-18447, OTP-18448,
OTP-18451, OTP-18452, OTP-18453, OTP-18455,
OTP-18456, OTP-18459, OTP-18465, OTP-18466,
OTP-18471, OTP-18474, OTP-18476, OTP-18477,
OTP-18483, OTP-18484, OTP-18485, OTP-18486,
OTP-18487, OTP-18488, OTP-18490, OTP-18491,
OTP-18492, OTP-18493, OTP-18494, OTP-18495,
OTP-18498, OTP-18499, OTP-18500, OTP-18501,
OTP-18502, OTP-18505, OTP-18507, OTP-18510,
OTP-18511, OTP-18515, OTP-18517, OTP-18518,
OTP-18520, OTP-18521, OTP-18522, OTP-18523,
OTP-18524, OTP-18526, OTP-18528, OTP-18530,
OTP-18531, OTP-18533, OTP-18534, OTP-18536,
OTP-18537, OTP-18538, OTP-18539, OTP-18540,
OTP-18541, OTP-18542, OTP-18544, OTP-18546,
OTP-18547, OTP-18548, OTP-18549, OTP-18550,
OTP-18551, OTP-18552
Seq num: ERIERL-737, ERIERL-870, GH-3150, GH-3390,
GH-4225, GH-4343, GH-4965, GH-5276, GH-5325,
GH-5333, GH-5639, GH-5695, GH-5877, GH-5889,
GH-5899, GH-6014, GH-6085, GH-6098, GH-6117,
GH-6132, GH-6139, GH-6156, GH-6221, GH-6333,
GH-6339, GH-6348, GH-6380, GH-6455, GH-6461,
GH-6477, GH-6508, GH-6544, GH-6606, GH-6672,
GH-6679, GH-6706, GH-6850, GH-6942, GH-6990,
GH-7015, GH-7031, GH-7045, GH-7065, GH-7070
System: OTP
Release: 26
Application: asn1-5.1, common_test-1.25, compiler-8.3,
crypto-5.2, dialyzer-5.1, diameter-2.3,
erl_docgen-1.5, erl_interface-5.4, erts-14.0,
ftp-1.1.5, inets-9.0, jinterface-1.14,
kernel-9.0, megaco-4.4.4, mnesia-4.22,
observer-2.15, odbc-2.14.1, os_mon-2.9,
parsetools-2.5, public_key-1.14, reltool-1.0,
runtime_tools-2.0, sasl-4.2.1, snmp-5.14,
ssh-5.0, ssl-11.0, stdlib-5.0,
syntax_tools-3.1, tftp-1.1, tools-3.6, wx-2.3
Predecessor: OTP
Check out the git tag OTP-26.0, and build a full OTP system including
documentation.
---------------------------------------------------------------------
--- HIGHLIGHTS ------------------------------------------------------
---------------------------------------------------------------------
OTP-14835 Application(s): kernel, stdlib
Related Id(s): PR-5924
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.
OTP-17932 Application(s): erts, kernel, stdlib
Related Id(s): GH-3150, GH-3390, GH-4225, GH-4343,
PR-6144
The TTY/terminal subsystem has been rewritten from 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 as
standard_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.
OTP-18135 Application(s): erts
Related Id(s): GH-4965, PR-6046
*** POTENTIAL INCOMPATIBILITY ***
As announced when OTP 25 was released, multi time warp
mode is now enabled by default. This assumes that all
code executing on the system is time warp safe.
If you have old code in the system that is not time
warp safe, you now explicitly need to start the system
in no time warp mode (or singe time warp mode if it is
partially time warp safe) in order to avoid problems.
When starting the system in no time warp mode, the
system behaves as it did prior to the introduction of
the extended time functionality introduced in OTP 18.
If you have code that is not time warp safe, you are
strongly encouraged to change this so that you can use
multi time warp mode. Compared to no time warp mode,
multi time warp mode improves scalability and
performance as well as accuracy and precision of time
measurements.
OTP-18137 Application(s): compiler, erts
Related Id(s): PR-6259, PR-6404, PR-6576, PR-6804
There are several new optimization for binary syntax in
the JIT:
-- Creation and matching of binaries with segments of
fixed sizes have been optimized.
-- Creation and matching of UTF-8 segments have been
optimized.
-- Appending to binaries has been optimized.
OTP-18185 Application(s): compiler, erts
Related Id(s): GH-6139
The compiler and JIT now generate better code for
creation of small maps where all keys are literals
known at compile time.
OTP-18188 Application(s): dialyzer
Related Id(s): PR-5997
Dialyzer has a new incremental mode that be invoked by
giving the --incremental option when running Dialyzer.
This new incremental mode is likely to become the
default in a future release.
Incremental mode primarily differs from the previous,
"classic", ways of running Dialyzer, in that its model
is optimised around the common use case of regularly
analysing a single codebase, tweaking the code,
analysing it again, and so on, without explicit
reference to the building and checking of a PLT.
In this mode the PLT file acts much more like a true
cache, where users provide a codebase and a set of
files they care about, and Dialyzer does the legwork in
terms of deciding how to most efficiently report all of
the relevant warnings given the cached results it may
already have in the PLT (and if a PLT doesn't exist,
incremental mode will create one).
OTP-18228 Application(s): stdlib
Related Id(s): GH-5639
The performance of the base64 module has been
significantly improved. For example, on an x86_64
system with the JIT both encode and decode are more
than three times faster than in Erlang/OTP 25.
OTP-18235 Application(s): kernel, ssl
Related Id(s): PR-5840, PR-6104
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.
OTP-18278 Application(s): kernel, stdlib
Related Id(s): PR-6260
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.
OTP-18297 Application(s): compiler, stdlib
Related Id(s): GH-6348
A limitation in the binary syntax has been removed. It
is now possible to match binary patterns in parallel.
Example: <<A:8>> = <<B:4,C:4>> = Bin
OTP-18318 Application(s): stdlib
Related Id(s): PR-6347
In the lists, the zip family of functions now takes
options to allow handling lists of different lengths.
OTP-18334 Application(s): erts
Related Id(s): PR-6434
Support for UTF-8 atoms and strings in the NIF
interface including new functions enif_make_new_atom,
enif_make_new_atom_len and enif_get_string_length.
OTP-18367 Application(s): compiler, erts, stdlib
Related Id(s): GH-6544
The BIFs min/2 and max/2 are now allowed to be used in
guards and match specs.
OTP-18413 Application(s): compiler, erts, stdlib, syntax_tools,
tools
Related Id(s): EEP-58, PR-6727
Map comprehensions as suggested in EEP 58 has now been
implemented.
OTP-18414 Application(s): erts, stdlib
Related Id(s): PR-6151
Some map operations have been optimized by changing the
internal sort order of atom keys. This changes the
(undocumented) order of how atom keys in small maps are
printed and returned by maps:to_list/1 and maps:next/1.
The new order is unpredictable and may change between
different invocations of the Erlang VM.
For applications where order is important, there is a
new function maps:iterator/2 for creating iterators
that return the map elements in a deterministic order.
There are also new modifiers k and K for the format
string for io:format() to support printing map elements
ordered.
OTP-18431 Application(s): compiler, stdlib
Related Id(s): PR-6739
Improved the selective receive optimization, which can
now be enabled for references returned from other
functions.
This greatly improves the performance of
gen_server:send_request/3, gen_server:wait_response/2,
and similar functions.
OTP-18435 Application(s): erts
Related Id(s): PR-6827
The amount of significant bits in node local process
identifiers and port identifiers has been extended from
28 bits to 60 bits on 64-bit runtime systems. This
makes these identifiers large enough to in practice
never having to be reused during the life time of a
node.
OTP-18440 Application(s): erts
Related Id(s): PR-6351
New trace feature call_memory. Similar to call_time
tracing, but instead of measure accumulated time in
traced functions it measures accumulated heap space
consumed by traced functions. It can be used to compare
how much different functions are contributing to
garbage collection being triggered.
OTP-18445 Application(s): erts, stdlib
It is no longer necessary to enable a feature in the
runtime system in order to load modules that are using
it. It is sufficient to enable the feature in the
compiler when compiling it.
That means that to use feature maybe_expr in Erlang/OTP
26, it is sufficient to enable it during compilation.
In Erlang/OTP 27, feature maybe_expr will be enabled by
default, but it will be possible to disable it.
OTP-18459 Application(s): ssl
Add encoding and decoding of use_srtp hello extension
to facilitate for DTLS users to implement SRTP
functionality.
OTP-18491 Application(s): parsetools
Related Id(s): PR-6882
Leex has been extended with optional column number
support.
OTP-18495 Application(s): stdlib
Related Id(s): PR-6943
The family of enumeration functions in module lists has
been extended with enumerate/3 that allows a step value
to be supplied.
OTP-18498 Application(s): erts
Reintroduced the optimization that turned anonymous
functions without free variables into literals
(OTP-15195). This optimization was lost during
refactoring in OTP 24.
Alongside this fix, we plan to remove the "fun creator
pid" feature in OTP 27. See Upcoming Potential
Incompatibilities for more details.
OTP-18500 Application(s): stdlib
Update Unicode to version 15.0.0.
OTP-18522 Application(s): dialyzer, erts, stdlib
Added the new built-in type dynamic() introduced in
EEP-61, improving support for gradual type checkers.
---------------------------------------------------------------------
--- POTENTIAL INCOMPATIBILITIES -------------------------------------
---------------------------------------------------------------------
OTP-14771 Application(s): ssl
Remove less that 256 bit ECC from default supported ECC
pre TLS-1.3
OTP-17771 Application(s): erts
Related Id(s): GH-5325, PR-6370
The enif_set_option() function has been introduced into
the NIF API. It can be used in order to set the
ERL_NIF_OPT_DELAY_HALT and/or ERL_NIF_OPT_ON_HALT
options with which one can synchronize halt of the
runtime system with flushing enabled and execution of
NIFs. Halt of the runtime system without flushing
enabled, now terminates the runtime system without
execution of atexit/on_exit handlers that may have been
installed into the runtime system which might be
considered a potential incompatibility.
OTP-18135 Application(s): erts
Related Id(s): GH-4965, PR-6046
*** HIGHLIGHT ***
As announced when OTP 25 was released, multi time warp
mode is now enabled by default. This assumes that all
code executing on the system is time warp safe.
If you have old code in the system that is not time
warp safe, you now explicitly need to start the system
in no time warp mode (or singe time warp mode if it is
partially time warp safe) in order to avoid problems.
When starting the system in no time warp mode, the
system behaves as it did prior to the introduction of
the extended time functionality introduced in OTP 18.
If you have code that is not time warp safe, you are
strongly encouraged to change this so that you can use
multi time warp mode. Compared to no time warp mode,
multi time warp mode improves scalability and
performance as well as accuracy and precision of time
measurements.
OTP-18140 Application(s): erl_interface, erts, jinterface,
kernel
Related Id(s): PR-6072
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 by term_to_binary() and term_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.
OTP-18168 Application(s): ssl
Related Id(s): GH-6014, PR-6019
With this change, stateless tickets generated by server
with anti_replay option enabled can be used for
creating ClientHello throughout ticket lifetime.
Without this change, usability was limited to
WindowSize number of seconds configured for anti_replay
option.
OTP-18210 Application(s): kernel
Related Id(s): GH-5877, PR-5878
Fix 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.
OTP-18285 Application(s): kernel, ssh, stdlib
Related Id(s): PR-6262
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 type Alt+L. This brings the behaviour of Ctrl+L
closer to how bash and other shells work.
OTP-18344 Application(s): erts, kernel
Related Id(s): GH-6461, OTP-18324, PR-6481, PR-6522,
PR-6944
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
underlying SO_REUSEADDR socket option is now only set
if both the reusaddr and the reuseport inet options
have been set. This since the underlying SO_REUSEADDR
socket option on Windows behaves similar to how BSD
behaves if both the underlying socket options
SO_REUSEADDR and SO_REUSEPORT have been set. See the
documentation of the reuseaddr option for more
information.
OTP-18389 Application(s): dialyzer
Related Id(s): GH-6508, PR-6864
Dialyzer was accepting typespecs containing singleton
type variables that appeared in an union type.
Before this change, singleton type variables in an
union type were accepted (see example below). However,
type variable Foo appears only once in each branch of
the union type, so it is a singleton type variable (in
each branch of the union type) that is not bound.
-spec run_test(Opts) -> term() when Opts ::
{join_specs, Foo} | {test, Foo}.
Unbound type variables should be rejected by Dialyzer,
which now detects this error and rejects it in the same
manner as its non-union equivalent:
-spec run_test_error(Opts) -> term() when Opts ::
{join_specs, Foo}.
OTP-18438 Application(s): ssl
Related Id(s): GH-6679
For security reasons remove support for SHA1 and DSA
algorithms from default values.
OTP-18439 Application(s): dialyzer
Related Id(s): GH-5695, GH-6942, PR-6822
Dialyzer has enabled (by default) warnings about
unknown types and functions.
Prior to this change, Dialyzer had warnings about
unknown types and functions disabled (by default).
This default value has been overwritten; Dialyzer now
warns about unknown types and functions (as requested
by the community in GH-5695). Thus, the following two
examples are equivalent, i.e., passing the -Wunknown
function is enabled by default:
dialyzer moduler.erl -Wunknown -Wmissing_return
dialyzer moduler.erl -Wmissing_return
Dialyzer has a new flag, -Wno_unknown. Its purpose is
to suppress warnings about unknown functions and types.
Users who wish to suppress these warnings can invoke
Dialyzer using this flag. Example: dialyzer module.erl
-Wno_unknown
OTP-18455 Application(s): ssl
Related Id(s): GH-5899
Change the client default verify option to verify_peer.
Note that this makes it mandatory to also supply
trusted CA certificates or explicitly set verify to
verify_none. This also applies when using the so called
anonymous test cipher suites defined in TLS versions
pre TLS-1.3.
OTP-18471 Application(s): kernel, stdlib
Related Id(s): GH-6339, PR-6843
proc_lib:start*/* has become synchronous when the
started process fails. This requires that a failing
process use a new function proc_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 the start_link/* functions that
did this, and only when the started function exited,
not when it used init_ack/1,2 or init_fail/2,3 to
create the return value.
OTP-18488 Application(s): reltool
Related Id(s): PR-6836
Support for the experimental code archives feature has
been removed from reltool.
OTP-18490 Application(s): diameter, inets, mnesia, reltool,
snmp, ssh, tftp, wx
Related Id(s): GH-6339, OTP-18471, PR-6843
The implementation has been fixed to use
proc_lib:init_fail/2,3 where appropriate, instead of
proc_lib:init_ack/1,2.
OTP-18505 Application(s): erts
Related Id(s): PR-6991
The default encoding of atoms by term_to_binary and
term_to_iovec have changed from Latin1 to UTF-8. The
old encoding can still be obtained with options
{minor_version, 1}.
Apart from encoding code points between 128 and 255
with two bytes (UTF-8) instead of one, most atoms will
occupy one less byte as the length field use only one
byte instead of two if possible.
OTP-18530 Application(s): inets
IP display string will now always be in lower case,
effects ipv6 addresses.
OTP-18531 Application(s): ssl
If a user cancel alert with level warning is received
during handshake make it be handled the same regardless
of TLS version. If it is received in connection in
TLS-1.3 regard it as an error as it is inappropriate.
In TLS-1.3 all error alerts are considered FATAL
regardless of legacy alert type. But make sure legacy
type is printed in logs to not confuse users that are
expecting the same legacy type as sent by peer.
OTP-18536 Application(s): inets
Removed deprecated functions
OTP-18549 Application(s): erts, runtime_tools
Related Id(s): PR-7105
Removed the experimental erts_alloc_config module. It
no longer produced good configurations and cannot be
fixed in a reasonably backwards compatible manner. It
has since OTP 25 been deprecated and scheduled for
removal in OTP 26.
OTP-18551 Application(s): kernel
Related Id(s): PR-7106
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.
OTP-18552 Application(s): erts
Related Id(s): PR-6973
ERTS internal thread names have been changed. All
threads created by ERTS now have a prefix erts_
followed by a type name potentially followed by an
integer index. For example, normal schedulers are now
named erts_sched_<IX>, dirty CPU schedulers
erts_dcpus_<IX>, and dirty IO schedulers
erts_dios_<IX>. NIF and driver thread names are
truncated at 15 characters regardless of whether the
underlying platform support more characters or not.
---------------------------------------------------------------------
--- OTP-26.0 --------------------------------------------------------
---------------------------------------------------------------------
--- Fixed Bugs and Malfunctions ---
OTP-18364 Application(s): otp
Starting from Erlang/OTP 24, it has been possible to
write expressions such as A = catch Expr without
parentheses around the catch expression, but it was not
mentioned in the documentation. It now is.
OTP-18538 Application(s): megaco, otp
Related Id(s): GH-7031, PR-7078
Removed configure option --enable-sanitizers. It was
untested and broken. Address sanitizer for the emulator
has better support by the asan build target.
--- Improvements and New Features ---
OTP-18053 Application(s): erts, otp
Related Id(s): PR-6101
Updated configure cache for Windows. This makes
configure run faster on windows as many more checks are
cached.
OTP-18209 Application(s): otp
Related Id(s): PR-5881
Fix the make target release, release_docs, install and
install-docs now work when the target path contains
whitespace and/or unicode characters.
OTP-18492 Application(s): otp
Related Id(s): GH-6706
The documentation for the bit syntax has been updated
to correct some factual errors and omissions.
OTP-18511 Application(s): otp, stdlib
Related Id(s): PR-7017
The regular expression library powering the re module
is likely to be changed in Erlang/OTP 27. See Upcoming
Potential Incompatibilities.
---------------------------------------------------------------------
--- asn1-5.1 --------------------------------------------------------
---------------------------------------------------------------------
--- Fixed Bugs and Malfunctions ---
OTP-18534 Application(s): asn1
Related Id(s): ERIERL-737, PR-7039
The ASN.1 compiler rejects correctly specified
RELATIVE-OID values containing other RELATIVE-OID
values. This is now corrected.
--- Improvements and New Features ---
OTP-18441 Application(s): asn1
Minor code improvements.
OTP-18447 Application(s): asn1, crypto, erts, kernel,
public_key, runtime_tools
Handling of on_load modules during boot has been
improved by adding an extra step in the boot order for
embedded mode that runs all on_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.
Full runtime dependencies of asn1-5.1: erts-11.0, kernel-7.0,
stdlib-3.13
---------------------------------------------------------------------
--- common_test-1.25 ------------------------------------------------
---------------------------------------------------------------------
--- Fixed Bugs and Malfunctions ---
OTP-18377 Application(s): common_test
Related Id(s): PR-6437
This change improves Common Test docs (CT hook example
code) and adds Emacs skeleton with hook code.
--- Improvements and New Features ---
OTP-18259 Application(s): common_test
Related Id(s): PR-5924
Updated common_test with a more robust way to fetch old
releases, while ignoring the current release.
OTP-18340 Application(s): common_test
- re-write the XML ct module documentation into erlang
types to make Dialyzer able to catch more precise
errors
Full runtime dependencies of common_test-1.25: compiler-6.0,
crypto-4.5, debugger-4.1, erts-7.0, ftp-1.0, inets-6.0, kernel-8.4,
observer-2.1, runtime_tools-1.8.16, sasl-2.5, snmp-5.1.2, ssh-4.0,
stdlib-4.0, syntax_tools-1.7, tools-3.2, xmerl-1.3.8
---------------------------------------------------------------------
--- compiler-8.3 ----------------------------------------------------
---------------------------------------------------------------------
--- Improvements and New Features ---
OTP-18126 Application(s): compiler, erts
Related Id(s): PR-6033
Optimized record updates.
OTP-18137 Application(s): compiler, erts
Related Id(s): PR-6259, PR-6404, PR-6576, PR-6804
*** HIGHLIGHT ***
There are several new optimization for binary syntax in
the JIT:
-- Creation and matching of binaries with segments of
fixed sizes have been optimized.
-- Creation and matching of UTF-8 segments have been
optimized.
-- Appending to binaries has been optimized.
OTP-18185 Application(s): compiler, erts
Related Id(s): GH-6139
*** HIGHLIGHT ***
The compiler and JIT now generate better code for
creation of small maps where all keys are literals
known at compile time.
OTP-18297 Application(s): compiler, stdlib
Related Id(s): GH-6348
*** HIGHLIGHT ***
A limitation in the binary syntax has been removed. It
is now possible to match binary patterns in parallel.
Example: <<A:8>> = <<B:4,C:4>> = Bin
OTP-18337 Application(s): compiler, stdlib
Related Id(s): GH-6477, PR-6503
It is documented that $\^X is the ASCII code for
Control X, where X is an uppercase or lowercase letter.
However, this notation would work for any character X,
even then it didn't make sense.
In Erlang/OTP 26, it is now documented that the
following characters are also allowed to follow the \^
characters: @, [, \, ], ^, _, and ?. Attempt to use
other characters will be rejected with a compiler
error.
The value for $\^? is now 127 (instead of 31 as in
earlier releases).
OTP-18367 Application(s): compiler, erts, stdlib
Related Id(s): GH-6544
*** HIGHLIGHT ***
The BIFs min/2 and max/2 are now allowed to be used in
guards and match specs.
OTP-18413 Application(s): compiler, erts, stdlib, syntax_tools,
tools
Related Id(s): EEP-58, PR-6727
*** HIGHLIGHT ***
Map comprehensions as suggested in EEP 58 has now been
implemented.
OTP-18431 Application(s): compiler, stdlib
Related Id(s): PR-6739
*** HIGHLIGHT ***
Improved the selective receive optimization, which can
now be enabled for references returned from other
functions.
This greatly improves the performance of
gen_server:send_request/3, gen_server:wait_response/2,
and similar functions.
OTP-18502 Application(s): compiler
The compiler will now inline calls to maps:get/3.
Full runtime dependencies of compiler-8.3: crypto-5.1, erts-13.0,
kernel-8.4, stdlib-5.0
---------------------------------------------------------------------
--- crypto-5.2 ------------------------------------------------------
---------------------------------------------------------------------
--- Improvements and New Features ---
OTP-18204 Application(s): crypto
Related Id(s): PR-6203
Add support for SHAKE128 and SHAKE256.
OTP-18206 Application(s): crypto
Related Id(s): PR-6167
Make the -DOPENSSL_API_COMPAT flag work without
warnings.
OTP-18405 Application(s): crypto, diameter, kernel, ssl
Related Id(s): GH-6672, PR-6700, PR-6702, PR-6768,
PR-6769, PR-6812, PR-6814
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 to byte_size/ is preceded by a call to
is_binary/1 to ensure that bitstrings are rejected.
Note that the compiler removes redundant calls to
is_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 an is_binary/1 test immediately
before the call to byte_size/1.
OTP-18447 Application(s): asn1, crypto, erts, kernel,
public_key, runtime_tools
Handling of on_load modules during boot has been
improved by adding an extra step in the boot order for
embedded mode that runs all on_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.
Full runtime dependencies of crypto-5.2: erts-9.0, kernel-5.3,
stdlib-3.9
---------------------------------------------------------------------
--- dialyzer-5.1 ----------------------------------------------------
---------------------------------------------------------------------
--- Fixed Bugs and Malfunctions ---
OTP-18237 Application(s): dialyzer
Related Id(s): GH-6221, PR-6243
When checking behaviors, Dialyzer could generate false
warning that a callback function did not have the
correct type according to the spec in the behavior
definition.
OTP-18276 Application(s): dialyzer
Related Id(s): GH-6333
In a spec, list(none()) used to mean none(). It has now
been corrected to mean the empty list.
OTP-18389 Application(s): dialyzer
Related Id(s): GH-6508, PR-6864
*** POTENTIAL INCOMPATIBILITY ***
Dialyzer was accepting typespecs containing singleton
type variables that appeared in an union type.
Before this change, singleton type variables in an
union type were accepted (see example below). However,
type variable Foo appears only once in each branch of
the union type, so it is a singleton type variable (in
each branch of the union type) that is not bound.
-spec run_test(Opts) -> term() when Opts ::
{join_specs, Foo} | {test, Foo}.
Unbound type variables should be rejected by Dialyzer,
which now detects this error and rejects it in the same
manner as its non-union equivalent:
-spec run_test_error(Opts) -> term() when Opts ::
{join_specs, Foo}.
OTP-18485 Application(s): dialyzer
Related Id(s): GH-6850, PR-6854
Fixed a bug that prevented the --plts option from being
used together with --add-to-plt.
--- Improvements and New Features ---
OTP-18188 Application(s): dialyzer
Related Id(s): PR-5997
*** HIGHLIGHT ***
Dialyzer has a new incremental mode that be invoked by
giving the --incremental option when running Dialyzer.
This new incremental mode is likely to become the
default in a future release.
Incremental mode primarily differs from the previous,
"classic", ways of running Dialyzer, in that its model
is optimised around the common use case of regularly
analysing a single codebase, tweaking the code,
analysing it again, and so on, without explicit
reference to the building and checking of a PLT.
In this mode the PLT file acts much more like a true
cache, where users provide a codebase and a set of
files they care about, and Dialyzer does the legwork in
terms of deciding how to most efficiently report all of
the relevant warnings given the cached results it may
already have in the PLT (and if a PLT doesn't exist,
incremental mode will create one).
OTP-18238 Application(s): dialyzer
Related Id(s): PR-6271
Dialyzer now produces clearer error messages for
contract violations.
OTP-18282 Application(s): dialyzer
Related Id(s): GH-6132, PR-6335
The name of a built-in type can now be reused as the
name of type locally. That is useful when an OTP
release introduces a new built-in type; having the
possibility to redefine built-in types locally can make
it easier to maintain code that works in multiple OTP
releases.
OTP-18310 Application(s): dialyzer
There is new option -no_spec to ignore all specs. It is
useful for debugging when one suspects that some specs
could be incorrect.
OTP-18342 Application(s): dialyzer
Related Id(s): GH-6117, PR-6654
Dialyzer's overloaded domain warning becomes is
disabled by default, and can be enabled with the flag
-Woverlapping_contract.
Dialyzer used to issue a warning for overloaded domains
stating "such contracts are currently unsupported and
are simply ignored".
These contracts are not "ignored" but rather, Dialyzer
takes the union of the overloaded domains. This means
that we lose the dependency from each corresponding
input to output type. Because of this, the warning is
really about not being able to establish a dependency
between the input and output types of each respective
overloaded function specification.
OTP-18439 Application(s): dialyzer
Related Id(s): GH-5695, GH-6942, PR-6822
*** POTENTIAL INCOMPATIBILITY ***
Dialyzer has enabled (by default) warnings about
unknown types and functions.
Prior to this change, Dialyzer had warnings about
unknown types and functions disabled (by default).
This default value has been overwritten; Dialyzer now
warns about unknown types and functions (as requested
by the community in GH-5695). Thus, the following two
examples are equivalent, i.e., passing the -Wunknown
function is enabled by default:
dialyzer moduler.erl -Wunknown -Wmissing_return
dialyzer moduler.erl -Wmissing_return
Dialyzer has a new flag, -Wno_unknown. Its purpose is
to suppress warnings about unknown functions and types.
Users who wish to suppress these warnings can invoke
Dialyzer using this flag. Example: dialyzer module.erl
-Wno_unknown
OTP-18522 Application(s): dialyzer, erts, stdlib
*** HIGHLIGHT ***
Added the new built-in type dynamic() introduced in
EEP-61, improving support for gradual type checkers.
Full runtime dependencies of dialyzer-5.1: compiler-8.0, erts-12.0,
kernel-8.0, stdlib-4.0, syntax_tools-2.0, wx-2.0
---------------------------------------------------------------------
--- diameter-2.3 ----------------------------------------------------
---------------------------------------------------------------------
--- Improvements and New Features ---
OTP-18405 Application(s): crypto, diameter, kernel, ssl
Related Id(s): GH-6672, PR-6700, PR-6702, PR-6768,
PR-6769, PR-6812, PR-6814
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 to byte_size/ is preceded by a call to
is_binary/1 to ensure that bitstrings are rejected.
Note that the compiler removes redundant calls to
is_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 an is_binary/1 test immediately
before the call to byte_size/1.
OTP-18490 Application(s): diameter, inets, mnesia, reltool,
snmp, ssh, tftp, wx
Related Id(s): GH-6339, OTP-18471, PR-6843
*** POTENTIAL INCOMPATIBILITY ***
The implementation has been fixed to use
proc_lib:init_fail/2,3 where appropriate, instead of
proc_lib:init_ack/1,2.
Full runtime dependencies of diameter-2.3: erts-10.0, kernel-3.2,
ssl-9.0, stdlib-5.0
---------------------------------------------------------------------
--- erl_docgen-1.5 --------------------------------------------------
---------------------------------------------------------------------
--- Improvements and New Features ---
OTP-18338 Application(s): erl_docgen
Related Id(s): PR-6408
New XML tag <change>. Like a <note> box, but with a
different (steel blue) color and label. Intended to
contain talk about semantic differences between OTP
releases.
OTP-18501 Application(s): erl_docgen
Related Id(s): PR-6987
Add "since" attribute to XML taglist/tag elements to
document OTP version when a particular option/feature
was introduced. The version is shown out in the right
margin, similar to "since" versions for functions.
Full runtime dependencies of erl_docgen-1.5: edoc-1.0, erts-11.0,
kernel-8.0, stdlib-3.15, xmerl-1.3.7
---------------------------------------------------------------------
--- erl_interface-5.4 -----------------------------------------------
---------------------------------------------------------------------
--- Improvements and New Features ---
OTP-18140 Application(s): erl_interface, erts, jinterface,
kernel
Related Id(s): PR-6072
*** POTENTIAL INCOMPATIBILITY ***
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 by term_to_binary() and term_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.
--- Known Bugs and Problems ---
OTP-16607 Application(s): erl_interface
Related Id(s): OTP-16608
The ei API for decoding/encoding terms is not fully
64-bit compatible since terms that have a
representation on the external term format larger than
2 GB cannot be handled.
---------------------------------------------------------------------
--- erts-14.0 -------------------------------------------------------
---------------------------------------------------------------------
--- Fixed Bugs and Malfunctions ---
OTP-18016 Application(s): erts
If a local fun was called while reloading the *exact
same* module that defined said fun, there was a small
window in which the call would land in code that was
yet to be fully loaded.
OTP-18248 Application(s): erts, kernel
Related Id(s): GH-6085, PR-6227
Fix the TLS distribution to work when starting Erlang
in embedded mode and a connection is done before kernel
is fully started.
OTP-18271 Application(s): erts, kernel
Related Id(s): PR-6279
erl -remsh has been improved to provide better error
reasons and work when using a shell without terminal
support (that is an "oldshell").
OTP-18274 Application(s): erts
Related Id(s): PR-6048
Fix so that -fno-omit-frame-pointer is applied to all
of the Erlang VM when using the JIT so that tools, such
as perf, can crawl the process stacks.
OTP-18277 Application(s): erts
Related Id(s): PR-6306
Compilation server now support unicode paths in
compilation server for filesystems that are encoded
with unicode.
OTP-18498 Application(s): erts
*** HIGHLIGHT ***
Reintroduced the optimization that turned anonymous
functions without free variables into literals
(OTP-15195). This optimization was lost during
refactoring in OTP 24.
Alongside this fix, we plan to remove the "fun creator
pid" feature in OTP 27. See Upcoming Potential
Incompatibilities for more details.
--- Improvements and New Features ---
OTP-17771 Application(s): erts
Related Id(s): GH-5325, PR-6370
*** POTENTIAL INCOMPATIBILITY ***
The enif_set_option() function has been introduced into
the NIF API. It can be used in order to set the
ERL_NIF_OPT_DELAY_HALT and/or ERL_NIF_OPT_ON_HALT
options with which one can synchronize halt of the
runtime system with flushing enabled and execution of
NIFs. Halt of the runtime system without flushing
enabled, now terminates the runtime system without
execution of atexit/on_exit handlers that may have been
installed into the runtime system which might be
considered a potential incompatibility.
OTP-17932 Application(s): erts, kernel, stdlib
Related Id(s): GH-3150, GH-3390, GH-4225, GH-4343,
PR-6144
*** HIGHLIGHT ***
The TTY/terminal subsystem has been rewritten from 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 as
standard_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.
OTP-18029 Application(s): erts, kernel
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, gen_tcp and gen_udp
is *intended* to be used (not yet updated).
OTP-18053 Application(s): erts, otp
Related Id(s): PR-6101
Updated configure cache for Windows. This makes
configure run faster on windows as many more checks are
cached.
OTP-18126 Application(s): compiler, erts
Related Id(s): PR-6033
Optimized record updates.
OTP-18131 Application(s): erts
Optimized internal hash routines.
OTP-18135 Application(s): erts
Related Id(s): GH-4965, PR-6046
*** HIGHLIGHT ***
*** POTENTIAL INCOMPATIBILITY ***
As announced when OTP 25 was released, multi time warp
mode is now enabled by default. This assumes that all
code executing on the system is time warp safe.
If you have old code in the system that is not time
warp safe, you now explicitly need to start the system
in no time warp mode (or singe time warp mode if it is
partially time warp safe) in order to avoid problems.
When starting the system in no time warp mode, the
system behaves as it did prior to the introduction of
the extended time functionality introduced in OTP 18.
If you have code that is not time warp safe, you are
strongly encouraged to change this so that you can use
multi time warp mode. Compared to no time warp mode,
multi time warp mode improves scalability and
performance as well as accuracy and precision of time
measurements.
OTP-18137 Application(s): compiler, erts
Related Id(s): PR-6259, PR-6404, PR-6576, PR-6804
*** HIGHLIGHT ***
There are several new optimization for binary syntax in
the JIT:
-- Creation and matching of binaries with segments of
fixed sizes have been optimized.
-- Creation and matching of UTF-8 segments have been
optimized.
-- Appending to binaries has been optimized.
OTP-18140 Application(s): erl_interface, erts, jinterface,
kernel
Related Id(s): PR-6072
*** POTENTIAL INCOMPATIBILITY ***
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 by term_to_binary() and term_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.
OTP-18141 Application(s): erts
Related Id(s): OTP-18140, PR-6073
Optimization of process aliases made possible now that
support for version 4 node container types in the
external term format is mandatory.
OTP-18185 Application(s): compiler, erts
Related Id(s): GH-6139
*** HIGHLIGHT ***
The compiler and JIT now generate better code for
creation of small maps where all keys are literals
known at compile time.
OTP-18227 Application(s): erts
Related Id(s): PR-6254
When erl -eval fails to execute the command is not
printed to standard_error.
OTP-18334 Application(s): erts
Related Id(s): PR-6434
*** HIGHLIGHT ***
Support for UTF-8 atoms and strings in the NIF
interface including new functions enif_make_new_atom,
enif_make_new_atom_len and enif_get_string_length.
OTP-18344 Application(s): erts, kernel
Related Id(s): GH-6461, OTP-18324, PR-6481, PR-6522,
PR-6944
*** POTENTIAL INCOMPATIBILITY ***
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
underlying SO_REUSEADDR socket option is now only set
if both the reusaddr and the reuseport inet options
have been set. This since the underlying SO_REUSEADDR
socket option on Windows behaves similar to how BSD
behaves if both the underlying socket options
SO_REUSEADDR and SO_REUSEPORT have been set. See the
documentation of the reuseaddr option for more
information.
OTP-18360 Application(s): erts
Related Id(s): PR-6497
erlang:display/1 will now print large maps in a more
readable way (similar to how small maps are printed).
OTP-18367 Application(s): compiler, erts, stdlib
Related Id(s): GH-6544
*** HIGHLIGHT ***
The BIFs min/2 and max/2 are now allowed to be used in
guards and match specs.
OTP-18369 Application(s): erts
Fail enif_init_resource_type and friends by returning
NULL if not called during load/upgrade. Old behavior
was undefined.
OTP-18410 Application(s): erts
Related Id(s): GH-5889, PR-6345
New option include_shared_binaries for the
max_heap_size process limit. If set to true, large
binaries (> 64 bytes), which may be referred by several
processes, are included in the memory sum compared
against the max_heap_size limit.
OTP-18413 Application(s): compiler, erts, stdlib, syntax_tools,
tools
Related Id(s): EEP-58, PR-6727
*** HIGHLIGHT ***
Map comprehensions as suggested in EEP 58 has now been
implemented.
OTP-18414 Application(s): erts, stdlib
Related Id(s): PR-6151
*** HIGHLIGHT ***
Some map operations have been optimized by changing the
internal sort order of atom keys. This changes the
(undocumented) order of how atom keys in small maps are
printed and returned by maps:to_list/1 and maps:next/1.
The new order is unpredictable and may change between
different invocations of the Erlang VM.
For applications where order is important, there is a
new function maps:iterator/2 for creating iterators
that return the map elements in a deterministic order.
There are also new modifiers k and K for the format
string for io:format() to support printing map elements
ordered.
OTP-18424 Application(s): erts
Related Id(s): PR-6716
Reduced memory usage of file:read_file_info/1,2
OTP-18425 Application(s): erts
Related Id(s): GH-5333, PR-6628
Add new function current_stacktrace for trace match
specifications used by erlang:trace_pattern/3.
This new option puts the current stacktrace of the
caller into the trace message sent to the trace
receiver.
OTP-18435 Application(s): erts
Related Id(s): PR-6827
*** HIGHLIGHT ***
The amount of significant bits in node local process
identifiers and port identifiers has been extended from
28 bits to 60 bits on 64-bit runtime systems. This
makes these identifiers large enough to in practice
never having to be reused during the life time of a
node.
OTP-18440 Application(s): erts
Related Id(s): PR-6351
*** HIGHLIGHT ***
New trace feature call_memory. Similar to call_time
tracing, but instead of measure accumulated time in
traced functions it measures accumulated heap space
consumed by traced functions. It can be used to compare
how much different functions are contributing to
garbage collection being triggered.
OTP-18445 Application(s): erts, stdlib
*** HIGHLIGHT ***
It is no longer necessary to enable a feature in the
runtime system in order to load modules that are using
it. It is sufficient to enable the feature in the
compiler when compiling it.
That means that to use feature maybe_expr in Erlang/OTP
26, it is sufficient to enable it during compilation.
In Erlang/OTP 27, feature maybe_expr will be enabled by
default, but it will be possible to disable it.
OTP-18447 Application(s): asn1, crypto, erts, kernel,
public_key, runtime_tools
Handling of on_load modules during boot has been
improved by adding an extra step in the boot order for
embedded mode that runs all on_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.
OTP-18477 Application(s): erts
Related Id(s): PR-7006
Introduced the local option of term_to_binary/2 and
term_to_iovec/2.
OTP-18483 Application(s): erts
Related Id(s): PR-6888
Document the commonly used practice to create and store
static atoms at NIF load time in callbacks load or
upgrade.
OTP-18493 Application(s): erts
Related Id(s): PR-6272
Optimize ets:lookup_element for uncompressed tables by
using a more efficient method to copy the term from ETS
to the heap of the calling process.
OTP-18505 Application(s): erts
Related Id(s): PR-6991
*** POTENTIAL INCOMPATIBILITY ***
The default encoding of atoms by term_to_binary and
term_to_iovec have changed from Latin1 to UTF-8. The
old encoding can still be obtained with options
{minor_version, 1}.
Apart from encoding code points between 128 and 255
with two bytes (UTF-8) instead of one, most atoms will
occupy one less byte as the length field use only one
byte instead of two if possible.
OTP-18517 Application(s): erts
The version of zlib included in the Erlang/OTP source
code is now 1.2.13.
OTP-18520 Application(s): erts
Related Id(s): GH-6455
gen_tcp:send/*, gen_udp:send/* and gen_sctp:send/* have
been optimized to use the infamous receive reference
optimization, so now sending should not have bad
performance when the calling process has a large
message queue.
OTP-18522 Application(s): dialyzer, erts, stdlib
*** HIGHLIGHT ***
Added the new built-in type dynamic() introduced in
EEP-61, improving support for gradual type checkers.
OTP-18523 Application(s): erts
Related Id(s): PR-7004
Optimize maps:merge/2 memory consumption for small maps
(<33 keys) by reusing key tuples or entire maps if the
result map has the same number of keys as any of the
argument maps.
OTP-18524 Application(s): erts
Related Id(s): OTP-18523, PR-7004
Optimize maps:merge/2 memory consumption further for
small maps by mutating 2nd map to use literal key tuple
of 1st map if both have the same keys.
OTP-18526 Application(s): erts
Related Id(s): GH-7045
ceil/1, floor/1, is_bitstring/1, is_boolean/1,
is_function/2, and tuple_size/1 can now be used in
match specifications.
OTP-18540 Application(s): erts, kernel
Related Id(s): PR-6900
Allow IPv6 addresses as host in http packets decoded by
erlang:decode_packet/3 and gen_tcp packet option. The
IPv6 address should be enclosed within [] according to
RFC2732.
OTP-18549 Application(s): erts, runtime_tools
Related Id(s): PR-7105
*** POTENTIAL INCOMPATIBILITY ***
Removed the experimental erts_alloc_config module. It
no longer produced good configurations and cannot be
fixed in a reasonably backwards compatible manner. It
has since OTP 25 been deprecated and scheduled for
removal in OTP 26.
OTP-18552 Application(s): erts
Related Id(s): PR-6973
*** POTENTIAL INCOMPATIBILITY ***
ERTS internal thread names have been changed. All
threads created by ERTS now have a prefix erts_
followed by a type name potentially followed by an
integer index. For example, normal schedulers are now
named erts_sched_<IX>, dirty CPU schedulers
erts_dcpus_<IX>, and dirty IO schedulers
erts_dios_<IX>. NIF and driver thread names are
truncated at 15 characters regardless of whether the
underlying platform support more characters or not.
Full runtime dependencies of erts-14.0: kernel-9.0, sasl-3.3,
stdlib-4.1
---------------------------------------------------------------------
--- ftp-1.1.5 -------------------------------------------------------
---------------------------------------------------------------------
--- Fixed Bugs and Malfunctions ---
OTP-18359 Application(s): ftp
Related Id(s): PR-6545
Fixes the documentation for the ftp module and updates
the typing of ftp functions that return errors.
The documentation has been improved and the types of
the functions are now read from source code, instead of
being hard-coded in XML.
Functions returning errors of the form {error, Reason
:: 'ehost' | ...} are now similar to other modules,
i.e., {error, Reason :: term()}. If one wants to
understand the error, one must call the function
ftp:formaterror({error, Reason}).
--- Improvements and New Features ---
OTP-18541 Application(s): ftp
Remove deprecated functions in OTP-26
Full runtime dependencies of ftp-1.1.5: erts-7.0, kernel-6.0,
runtime_tools-1.15.1, ssl-10.2, stdlib-3.5
---------------------------------------------------------------------
--- inets-9.0 -------------------------------------------------------
---------------------------------------------------------------------
--- Fixed Bugs and Malfunctions ---
OTP-18476 Application(s): inets
Related Id(s): GH-6380
Correct timing related pipelining/keepalive queue bug,
that could result in unexpected "socket_remotly_closed"
errors.
--- Improvements and New Features ---
OTP-18167 Application(s): inets
By default ssl connections will use options from
ssl_default_options(true)
OTP-18350 Application(s): inets, observer, os_mon, reltool, wx
Runtime dependencies have been updated.
OTP-18490 Application(s): diameter, inets, mnesia, reltool,
snmp, ssh, tftp, wx
Related Id(s): GH-6339, OTP-18471, PR-6843
*** POTENTIAL INCOMPATIBILITY ***
The implementation has been fixed to use
proc_lib:init_fail/2,3 where appropriate, instead of
proc_lib:init_ack/1,2.
OTP-18530 Application(s): inets
*** POTENTIAL INCOMPATIBILITY ***
IP display string will now always be in lower case,
effects ipv6 addresses.
OTP-18536 Application(s): inets
*** POTENTIAL INCOMPATIBILITY ***
Removed deprecated functions
OTP-18544 Application(s): inets
Related Id(s): GH-5276
Update the code in the inets example directory to
reflect the latest implementation
Full runtime dependencies of inets-9.0: erts-14.0, kernel-9.0,
mnesia-4.12, public_key-1.13, runtime_tools-1.8.14, ssl-9.0,
stdlib-5.0, stdlib-5.0
---------------------------------------------------------------------
--- jinterface-1.14 -------------------------------------------------
---------------------------------------------------------------------
--- Improvements and New Features ---
OTP-18140 Application(s): erl_interface, erts, jinterface,
kernel
Related Id(s): PR-6072
*** POTENTIAL INCOMPATIBILITY ***
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 by term_to_binary() and term_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.
---------------------------------------------------------------------
--- kernel-9.0 ------------------------------------------------------
---------------------------------------------------------------------
--- Fixed Bugs and Malfunctions ---
OTP-18210 Application(s): kernel
Related Id(s): GH-5877, PR-5878
*** POTENTIAL INCOMPATIBILITY ***
Fix 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.
OTP-18225 Application(s): kernel
Related Id(s): PR-6036
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.
OTP-18226 Application(s): kernel
Related Id(s): PR-6253
Fix the logger_std_h handler to log to standard_error
if logging to standard_io fails for any reason.
OTP-18248 Application(s): erts, kernel
Related Id(s): GH-6085, PR-6227
Fix the TLS distribution to work when starting Erlang
in embedded mode and a connection is done before kernel
is fully started.
OTP-18271 Application(s): erts, kernel
Related Id(s): PR-6279
erl -remsh has been improved to provide better error
reasons and work when using a shell without terminal
support (that is an "oldshell").
OTP-18286 Application(s): kernel
Related Id(s): PR-5955
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.
OTP-18471 Application(s): kernel, stdlib
Related Id(s): GH-6339, PR-6843
*** POTENTIAL INCOMPATIBILITY ***
proc_lib:start*/* has become synchronous when the
started process fails. This requires that a failing
process use a new function proc_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 the start_link/* functions that
did this, and only when the started function exited,
not when it used init_ack/1,2 or init_fail/2,3 to
create the return value.
OTP-18486 Application(s): kernel, stdlib
Related Id(s): PR-6881
Fixed a bug where file:read(standard_io, ...)
unexpectedly returned eof in binary mode.
OTP-18528 Application(s): kernel
Related Id(s): PR-7009
Return type for seq_trace:get_token/1 fixed.
OTP-18547 Application(s): kernel
Related Id(s): PR-7092
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.
--- Improvements and New Features ---
OTP-14835 Application(s): kernel, stdlib
Related Id(s): PR-5924
*** HIGHLIGHT ***
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.
OTP-17932 Application(s): erts, kernel, stdlib
Related Id(s): GH-3150, GH-3390, GH-4225, GH-4343,
PR-6144
*** HIGHLIGHT ***
The TTY/terminal subsystem has been rewritten from 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 as
standard_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.
OTP-18029 Application(s): erts, kernel
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, gen_tcp and gen_udp
is *intended* to be used (not yet updated).
OTP-18140 Application(s): erl_interface, erts, jinterface,
kernel
Related Id(s): PR-6072
*** POTENTIAL INCOMPATIBILITY ***
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 by term_to_binary() and term_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.
OTP-18235 Application(s): kernel, ssl
Related Id(s): PR-5840, PR-6104
*** HIGHLIGHT ***
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.
OTP-18261 Application(s): kernel
Related Id(s): PR-5924
Add code:get_doc/2 which adds support to fetch
documentation skeletons of functions using debug_info
chunks instead of eep48 doc chunks.
OTP-18278 Application(s): kernel, stdlib
Related Id(s): PR-6260
*** HIGHLIGHT ***
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.
OTP-18285 Application(s): kernel, ssh, stdlib
Related Id(s): PR-6262
*** POTENTIAL INCOMPATIBILITY ***
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 type Alt+L. This brings the behaviour of Ctrl+L
closer to how bash and other shells work.
OTP-18305 Application(s): kernel
Related Id(s): PR-5831
gen_server optimized by caching callback functions
OTP-18327 Application(s): kernel
Related Id(s): PR-6433
Prepare the pg communication protocol for upgrade. The
plan is for OTP-28 nodes to be able to use an upgraded
pg protocol while still being able to talk with OTP 26
nodes.
OTP-18331 Application(s): kernel
Related Id(s): ERIERL-870
New log type 'rotate', where the log files are
compressed upon rotation.
OTP-18344 Application(s): erts, kernel
Related Id(s): GH-6461, OTP-18324, PR-6481, PR-6522,
PR-6944
*** POTENTIAL INCOMPATIBILITY ***
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
underlying SO_REUSEADDR socket option is now only set
if both the reusaddr and the reuseport inet options
have been set. This since the underlying SO_REUSEADDR
socket option on Windows behaves similar to how BSD
behaves if both the underlying socket options
SO_REUSEADDR and SO_REUSEPORT have been set. See the
documentation of the reuseaddr option for more
information.
OTP-18405 Application(s): crypto, diameter, kernel, ssl
Related Id(s): GH-6672, PR-6700, PR-6702, PR-6768,
PR-6769, PR-6812, PR-6814
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 to byte_size/ is preceded by a call to
is_binary/1 to ensure that bitstrings are rejected.
Note that the compiler removes redundant calls to
is_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 an is_binary/1 test immediately
before the call to byte_size/1.
OTP-18419 Application(s): kernel
The function file:pid2name/1 is deprecated and will be
removed in Erlang/OTP 27.
OTP-18442 Application(s): kernel
Related Id(s): GH-6606, PR-6786
The modules Erlang DNS resolver inet_res and helper
modules have been updated for RFC6891; to handle OPT RR
with DNSSEC OK (DO) bit.
OTP-18444 Application(s): kernel
Related Id(s): PR-6035
Introduced application:get_supervisor/1.
OTP-18447 Application(s): asn1, crypto, erts, kernel,
public_key, runtime_tools
Handling of on_load modules during boot has been
improved by adding an extra step in the boot order for
embedded mode that runs all on_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.
OTP-18448 Application(s): kernel
Related Id(s): PR-6736
Reduce contention on the code_server by doing the code
preparation on the client.
OTP-18451 Application(s): kernel
Related Id(s): PR-6737
Added a mode to ensure_all_loaded, to start children
application and their dependencies concurrently.
OTP-18452 Application(s): kernel
Related Id(s): PR-6729
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.
OTP-18456 Application(s): kernel, ssl
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.
OTP-18466 Application(s): kernel
Related Id(s): PR-6832
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.
OTP-18484 Application(s): kernel
Related Id(s): PR-6844
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.
OTP-18510 Application(s): kernel
Related Id(s): GH-6098, PR-6982
The internal DNS resolver has bee updated to handle DNS
LOC RR:s (RFC 1876). This is an undocumented module,
although still used by power users. See the source
code.
OTP-18521 Application(s): kernel
Related Id(s): PR-7025
Reduced memory consumption in global when informing
other nodes about lost connections.
OTP-18533 Application(s): kernel
Related Id(s): PR-7061
The net_kernel, global, and global_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.
OTP-18540 Application(s): erts, kernel
Related Id(s): PR-6900
Allow IPv6 addresses as host in http packets decoded by
erlang:decode_packet/3 and gen_tcp packet option. The
IPv6 address should be enclosed within [] according to
RFC2732.
OTP-18542 Application(s): kernel
Remove deprecated functions in OTP-26
OTP-18551 Application(s): kernel
Related Id(s): PR-7106
*** POTENTIAL INCOMPATIBILITY ***
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.
Full runtime dependencies of kernel-9.0: crypto-5.0, erts-14.0,
sasl-3.0, stdlib-5.0
---------------------------------------------------------------------
--- megaco-4.4.4 ----------------------------------------------------
---------------------------------------------------------------------
--- Fixed Bugs and Malfunctions ---
OTP-18538 Application(s): megaco, otp
Related Id(s): GH-7031, PR-7078
Removed configure option --enable-sanitizers. It was
untested and broken. Address sanitizer for the emulator
has better support by the asan build target.
Full runtime dependencies of megaco-4.4.4: asn1-3.0, debugger-4.0,
erts-12.0, et-1.5, kernel-8.0, runtime_tools-1.8.14, stdlib-2.5
---------------------------------------------------------------------
--- mnesia-4.22 -----------------------------------------------------
---------------------------------------------------------------------
--- Improvements and New Features ---
OTP-18309 Application(s): mnesia
Related Id(s): PR-6377
Added debug statistics for active transactions.
OTP-18490 Application(s): diameter, inets, mnesia, reltool,
snmp, ssh, tftp, wx
Related Id(s): GH-6339, OTP-18471, PR-6843
*** POTENTIAL INCOMPATIBILITY ***
The implementation has been fixed to use
proc_lib:init_fail/2,3 where appropriate, instead of
proc_lib:init_ack/1,2.
Full runtime dependencies of mnesia-4.22: erts-9.0, kernel-5.3,
stdlib-5.0
---------------------------------------------------------------------
--- observer-2.15 ---------------------------------------------------
---------------------------------------------------------------------
--- Improvements and New Features ---
OTP-18350 Application(s): inets, observer, os_mon, reltool, wx
Runtime dependencies have been updated.
OTP-18430 Application(s): observer
Related Id(s): PR-6397
Added start/1, start_and_wait functions/1|2 functions.
Full runtime dependencies of observer-2.15: erts-14.0, et-1.5,
kernel-9.0, runtime_tools-1.19, stdlib-5.0, wx-2.3
---------------------------------------------------------------------
--- odbc-2.14.1 -----------------------------------------------------
---------------------------------------------------------------------
--- Improvements and New Features ---
OTP-18539 Application(s): odbc
Allow larger column sizes than 8001 in case DB supports
it.
Full runtime dependencies of odbc-2.14.1: erts-6.0, kernel-3.0,
stdlib-2.0
---------------------------------------------------------------------
--- os_mon-2.9 ------------------------------------------------------
---------------------------------------------------------------------
--- Fixed Bugs and Malfunctions ---
OTP-18246 Application(s): os_mon
Related Id(s): GH-6156, PR-6284
Fix internal os_mon_sysinfo:get_disk_info/1 function to
not crash when run on Windows with multiple drives.
OTP-18546 Application(s): os_mon
Related Id(s): GH-7070, PR-7071
Fixed a memory leak when calling cpu_sup:util/0,1 on
FreeBSD.
--- Improvements and New Features ---
OTP-18303 Application(s): os_mon
Related Id(s): PR-6384
The disksup:get_disk_info/0 and disksup:get_disk_info/1
functions have been introduced. These can be used in
order to immediately fetch information about current
disk usage.
OTP-18350 Application(s): inets, observer, os_mon, reltool, wx
Runtime dependencies have been updated.
Full runtime dependencies of os_mon-2.9: erts-14.0, kernel-9.0,
sasl-4.2.1, stdlib-5.0
---------------------------------------------------------------------
--- parsetools-2.5 --------------------------------------------------
---------------------------------------------------------------------
--- Improvements and New Features ---
OTP-18491 Application(s): parsetools
Related Id(s): PR-6882
*** HIGHLIGHT ***
Leex has been extended with optional column number
support.
Full runtime dependencies of parsetools-2.5: erts-6.0, kernel-3.0,
stdlib-3.4
---------------------------------------------------------------------
--- public_key-1.14 -------------------------------------------------
---------------------------------------------------------------------
--- Improvements and New Features ---
OTP-18447 Application(s): asn1, crypto, erts, kernel,
public_key, runtime_tools
Handling of on_load modules during boot has been
improved by adding an extra step in the boot order for
embedded mode that runs all on_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.
Full runtime dependencies of public_key-1.14: asn1-3.0, crypto-4.6,
erts-6.0, kernel-3.0, stdlib-3.5
---------------------------------------------------------------------
--- reltool-1.0 -----------------------------------------------------
---------------------------------------------------------------------
--- Improvements and New Features ---
OTP-18230 Application(s): reltool
Related Id(s): PR-5936
Add possibility to strip specific chunks from beam
files included in a release. Before this change it was
only possible to strip all chunks from the beam files.
OTP-18350 Application(s): inets, observer, os_mon, reltool, wx
Runtime dependencies have been updated.
OTP-18488 Application(s): reltool
Related Id(s): PR-6836
*** POTENTIAL INCOMPATIBILITY ***
Support for the experimental code archives feature has
been removed from reltool.
OTP-18490 Application(s): diameter, inets, mnesia, reltool,
snmp, ssh, tftp, wx
Related Id(s): GH-6339, OTP-18471, PR-6843
*** POTENTIAL INCOMPATIBILITY ***
The implementation has been fixed to use
proc_lib:init_fail/2,3 where appropriate, instead of
proc_lib:init_ack/1,2.
Full runtime dependencies of reltool-1.0: erts-14.0, kernel-9.0,
sasl-4.2.1, stdlib-5.0, stdlib-5.0, tools-2.6.14, wx-2.3
---------------------------------------------------------------------
--- runtime_tools-2.0 -----------------------------------------------
---------------------------------------------------------------------
--- Fixed Bugs and Malfunctions ---
OTP-18499 Application(s): runtime_tools
Related Id(s): PR-6946
Fixed the type specification for
instrument:carriers/0,1
--- Improvements and New Features ---
OTP-18211 Application(s): runtime_tools
Related Id(s): PR-6143
Add dbg:tracer(file, Filename) as a convenient way to
trace to a file in clean text.
OTP-18447 Application(s): asn1, crypto, erts, kernel,
public_key, runtime_tools
Handling of on_load modules during boot has been
improved by adding an extra step in the boot order for
embedded mode that runs all on_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.
OTP-18487 Application(s): runtime_tools, tools
Related Id(s): PR-6829
The instrument module has been moved from tools to
runtime_tools.
OTP-18549 Application(s): erts, runtime_tools
Related Id(s): PR-7105
*** POTENTIAL INCOMPATIBILITY ***
Removed the experimental erts_alloc_config module. It
no longer produced good configurations and cannot be
fixed in a reasonably backwards compatible manner. It
has since OTP 25 been deprecated and scheduled for
removal in OTP 26.
Full runtime dependencies of runtime_tools-2.0: erts-11.0,
kernel-8.1, mnesia-4.12, stdlib-3.13
---------------------------------------------------------------------
--- sasl-4.2.1 ------------------------------------------------------
---------------------------------------------------------------------
--- Fixed Bugs and Malfunctions ---
OTP-18300 Application(s): sasl
Related Id(s): PR-6389
Improve error message from systools:make_script, when
.app parameters contain duplicates. The parameters that
will be checked are modules, applications and
registered.
Full runtime dependencies of sasl-4.2.1: erts-10.2, kernel-6.0,
stdlib-4.0, tools-2.6.14
---------------------------------------------------------------------
--- snmp-5.14 -------------------------------------------------------
---------------------------------------------------------------------
--- Improvements and New Features ---
OTP-18490 Application(s): diameter, inets, mnesia, reltool,
snmp, ssh, tftp, wx
Related Id(s): GH-6339, OTP-18471, PR-6843
*** POTENTIAL INCOMPATIBILITY ***
The implementation has been fixed to use
proc_lib:init_fail/2,3 where appropriate, instead of
proc_lib:init_ack/1,2.
Full runtime dependencies of snmp-5.14: crypto-4.6, erts-12.0,
kernel-8.0, mnesia-4.12, runtime_tools-1.8.14, stdlib-5.0
---------------------------------------------------------------------
--- ssh-5.0 ---------------------------------------------------------
---------------------------------------------------------------------
--- Improvements and New Features ---
OTP-18231 Application(s): ssh
Related Id(s): OTP-17932, PR-6144
The ssh_cli has been updated to work with the changes
introduced in the new Erlang shell implementation.
OTP-18285 Application(s): kernel, ssh, stdlib
Related Id(s): PR-6262
*** POTENTIAL INCOMPATIBILITY ***
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 type Alt+L. This brings the behaviour of Ctrl+L
closer to how bash and other shells work.
OTP-18490 Application(s): diameter, inets, mnesia, reltool,
snmp, ssh, tftp, wx
Related Id(s): GH-6339, OTP-18471, PR-6843
*** POTENTIAL INCOMPATIBILITY ***
The implementation has been fixed to use
proc_lib:init_fail/2,3 where appropriate, instead of
proc_lib:init_ack/1,2.
Full runtime dependencies of ssh-5.0: crypto-5.0, erts-14.0,
kernel-9.0, public_key-1.6.1, runtime_tools-1.15.1, stdlib-5.0,
stdlib-5.0
---------------------------------------------------------------------
--- ssl-11.0 --------------------------------------------------------
---------------------------------------------------------------------
--- Fixed Bugs and Malfunctions ---
OTP-18550 Application(s): ssl
Client signature algorithm list input order is now
honored again , it was accidently reversed by a
previous fix.
--- Improvements and New Features ---
OTP-14771 Application(s): ssl
*** POTENTIAL INCOMPATIBILITY ***
Remove less that 256 bit ECC from default supported ECC
pre TLS-1.3
OTP-15903 Application(s): ssl
Improved error checking and handling of ssl options.
OTP-18168 Application(s): ssl
Related Id(s): GH-6014, PR-6019
*** POTENTIAL INCOMPATIBILITY ***
With this change, stateless tickets generated by server
with anti_replay option enabled can be used for
creating ClientHello throughout ticket lifetime.
Without this change, usability was limited to
WindowSize number of seconds configured for anti_replay
option.
OTP-18235 Application(s): kernel, ssl
Related Id(s): PR-5840, PR-6104
*** HIGHLIGHT ***
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.
OTP-18253 Application(s): ssl
With this change, TLS 1.3 server can be configured to
include client certificate in session ticket.
OTP-18254 Application(s): ssl
Related Id(s): PR-5982
With this change, it is possible to configure
encryption seed to be used with TLS1.3 stateless
tickets. This enables using tickets on different server
instances.
OTP-18312 Application(s): ssl
Debugging enhancements.
OTP-18335 Application(s): ssl
With this change, maybe keyword atom is not used as
function name in ssl code.
OTP-18405 Application(s): crypto, diameter, kernel, ssl
Related Id(s): GH-6672, PR-6700, PR-6702, PR-6768,
PR-6769, PR-6812, PR-6814
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 to byte_size/ is preceded by a call to
is_binary/1 to ensure that bitstrings are rejected.
Note that the compiler removes redundant calls to
is_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 an is_binary/1 test immediately
before the call to byte_size/1.
OTP-18438 Application(s): ssl
Related Id(s): GH-6679
*** POTENTIAL INCOMPATIBILITY ***
For security reasons remove support for SHA1 and DSA
algorithms from default values.
OTP-18453 Application(s): ssl
Mitigate memory usage from large certificate chains by
lowering the maximum handshake size. This should not
effect the common cases, if needed it can be configured
to a higher value.
OTP-18455 Application(s): ssl
Related Id(s): GH-5899
*** POTENTIAL INCOMPATIBILITY ***
Change the client default verify option to verify_peer.
Note that this makes it mandatory to also supply
trusted CA certificates or explicitly set verify to
verify_none. This also applies when using the so called
anonymous test cipher suites defined in TLS versions
pre TLS-1.3.
OTP-18456 Application(s): kernel, ssl
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.
OTP-18459 Application(s): ssl
*** HIGHLIGHT ***
Add encoding and decoding of use_srtp hello extension
to facilitate for DTLS users to implement SRTP
functionality.
OTP-18465 Application(s): ssl
Related Id(s): GH-7065
Refactors the (ssl application to use macros for TLS
and DTLS versions instead of hard-coded tuple numbers.
This change improves the maintainability of ssl
OTP-18507 Application(s): ssl
If the function ssl:renegotiate/1 is called on
connection that is running TLS-1.3 return an error
instead of hanging or timing out.
OTP-18531 Application(s): ssl
*** POTENTIAL INCOMPATIBILITY ***
If a user cancel alert with level warning is received
during handshake make it be handled the same regardless
of TLS version. If it is received in connection in
TLS-1.3 regard it as an error as it is inappropriate.
In TLS-1.3 all error alerts are considered FATAL
regardless of legacy alert type. But make sure legacy
type is printed in logs to not confuse users that are
expecting the same legacy type as sent by peer.
Full runtime dependencies of ssl-11.0: crypto-5.0, erts-14.0,
inets-5.10.7, kernel-9.0, public_key-1.11.3, runtime_tools-1.15.1,
stdlib-4.1
---------------------------------------------------------------------
--- stdlib-5.0 ------------------------------------------------------
---------------------------------------------------------------------
--- Fixed Bugs and Malfunctions ---
OTP-18275 Application(s): stdlib
Related Id(s): PR-6045
All process calls in dets have been updated to use the
receive queue optimizations.
OTP-18471 Application(s): kernel, stdlib
Related Id(s): GH-6339, PR-6843
*** POTENTIAL INCOMPATIBILITY ***
proc_lib:start*/* has become synchronous when the
started process fails. This requires that a failing
process use a new function proc_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 the start_link/* functions that
did this, and only when the started function exited,
not when it used init_ack/1,2 or init_fail/2,3 to
create the return value.
OTP-18486 Application(s): kernel, stdlib
Related Id(s): PR-6881
Fixed a bug where file:read(standard_io, ...)
unexpectedly returned eof in binary mode.
OTP-18548 Application(s): stdlib
Related Id(s): PR-6967
Fix return value 'undefined' of v(N) is treated as
missing command.
--- Improvements and New Features ---
OTP-14835 Application(s): kernel, stdlib
Related Id(s): PR-5924
*** HIGHLIGHT ***
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.
OTP-15597 Application(s): stdlib
Related Id(s): PR-5831
Gen_server now caches external functions for use in
handle_call, handle_cast and handle_info.
OTP-17932 Application(s): erts, kernel, stdlib
Related Id(s): GH-3150, GH-3390, GH-4225, GH-4343,
PR-6144
*** HIGHLIGHT ***
The TTY/terminal subsystem has been rewritten from 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 as
standard_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.
OTP-18150 Application(s): stdlib
Added codepoint category to unicode_util
OTP-18159 Application(s): stdlib
Related Id(s): PR-6904
Added the zip:zip_get_crc32/2 function to retrieve the
CRC32 checksum from an opened ZIP archive.
OTP-18176 Application(s): stdlib
Related Id(s): PR-6118
Add the new options post_process_args and detached to
peer:start function.
OTP-18221 Application(s): stdlib
Related Id(s): PR-6197
The re:replace/3,4 functions now accept as the
replacement argument.
OTP-18228 Application(s): stdlib
Related Id(s): GH-5639
*** HIGHLIGHT ***
The performance of the base64 module has been
significantly improved. For example, on an x86_64
system with the JIT both encode and decode are more
than three times faster than in Erlang/OTP 25.
OTP-18236 Application(s): stdlib
Related Id(s): PR-6256
Improved implementation of timer:apply_interval/4
reducing load on the timer server, and introduction of
the new function timer:apply_repeatedly/4.
timer:apply_repeatedly/4 is similar to
timer:apply_interval/4, but timer:apply_repeatedly/4
prevents parallel execution of triggered apply
operations which timer:apply_interval/4 does not.
OTP-18247 Application(s): stdlib
Related Id(s): PR-6280, PR-6711
The base64 module now supports encoding and decoding
with an alternate URL safe alphabet, and an option for
accepting or adding missing = padding characters.
OTP-18272 Application(s): stdlib
Related Id(s): PR-6279
Add shell:whereis/0 which can be used to locate the
current shell process.
OTP-18278 Application(s): kernel, stdlib
Related Id(s): PR-6260
*** HIGHLIGHT ***
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.
OTP-18279 Application(s): stdlib
Related Id(s): PR-6234
New function ets:lookup_element/4 with a Default
argument returned if the key did not exist in the
table. The old ets:lookup_element/3 raises a badarg
exception which can be both inconveniente and slower.
OTP-18285 Application(s): kernel, ssh, stdlib
Related Id(s): PR-6262
*** POTENTIAL INCOMPATIBILITY ***
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 type Alt+L. This brings the behaviour of Ctrl+L
closer to how bash and other shells work.
OTP-18287 Application(s): stdlib
Related Id(s): PR-5955
peer nodes using standard_io connections now include
standard error from the node in the io stream from the
started node.
OTP-18297 Application(s): compiler, stdlib
Related Id(s): GH-6348
*** HIGHLIGHT ***
A limitation in the binary syntax has been removed. It
is now possible to match binary patterns in parallel.
Example: <<A:8>> = <<B:4,C:4>> = Bin
OTP-18301 Application(s): stdlib
Related Id(s): PR-6350
Improve type specification of
unicode:characters_to_list().
OTP-18318 Application(s): stdlib
Related Id(s): PR-6347
*** HIGHLIGHT ***
In the lists, the zip family of functions now takes
options to allow handling lists of different lengths.
OTP-18337 Application(s): compiler, stdlib
Related Id(s): GH-6477, PR-6503
It is documented that $\^X is the ASCII code for
Control X, where X is an uppercase or lowercase letter.
However, this notation would work for any character X,
even then it didn't make sense.
In Erlang/OTP 26, it is now documented that the
following characters are also allowed to follow the \^
characters: @, [, \, ], ^, _, and ?. Attempt to use
other characters will be rejected with a compiler
error.
The value for $\^? is now 127 (instead of 31 as in
earlier releases).
OTP-18354 Application(s): stdlib
Related Id(s): PR-6297
The binary:encode_hex/2 function has been added to
allow the encoded hexadecimal digits to be in either
lower or upper case.
OTP-18355 Application(s): stdlib
Related Id(s): PR-6507
Variants of timer:tc() with user specified time unit
have been introduced.
OTP-18361 Application(s): stdlib
Related Id(s): PR-6536
New function math:tau/0. Returns 2*math:pi().
OTP-18367 Application(s): compiler, erts, stdlib
Related Id(s): GH-6544
*** HIGHLIGHT ***
The BIFs min/2 and max/2 are now allowed to be used in
guards and match specs.
OTP-18385 Application(s): stdlib
Related Id(s): PR-6698
Optimized gen_server:multi_call().
OTP-18413 Application(s): compiler, erts, stdlib, syntax_tools,
tools
Related Id(s): EEP-58, PR-6727
*** HIGHLIGHT ***
Map comprehensions as suggested in EEP 58 has now been
implemented.
OTP-18414 Application(s): erts, stdlib
Related Id(s): PR-6151
*** HIGHLIGHT ***
Some map operations have been optimized by changing the
internal sort order of atom keys. This changes the
(undocumented) order of how atom keys in small maps are
printed and returned by maps:to_list/1 and maps:next/1.
The new order is unpredictable and may change between
different invocations of the Erlang VM.
For applications where order is important, there is a
new function maps:iterator/2 for creating iterators
that return the map elements in a deterministic order.
There are also new modifiers k and K for the format
string for io:format() to support printing map elements
ordered.
OTP-18423 Application(s): stdlib
Related Id(s): com/erlang/backlog/issues/142,
https://github
Make gen_server fail "silently" with a new return value
for init/1.
OTP-18431 Application(s): compiler, stdlib
Related Id(s): PR-6739
*** HIGHLIGHT ***
Improved the selective receive optimization, which can
now be enabled for references returned from other
functions.
This greatly improves the performance of
gen_server:send_request/3, gen_server:wait_response/2,
and similar functions.
OTP-18445 Application(s): erts, stdlib
*** HIGHLIGHT ***
It is no longer necessary to enable a feature in the
runtime system in order to load modules that are using
it. It is sufficient to enable the feature in the
compiler when compiling it.
That means that to use feature maybe_expr in Erlang/OTP
26, it is sufficient to enable it during compilation.
In Erlang/OTP 27, feature maybe_expr will be enabled by
default, but it will be possible to disable it.
OTP-18474 Application(s): stdlib
Related Id(s): PR-6895
Static supervisors are very idle processes after they
have started so they will now be hibernated after start
to improve resource management.
OTP-18494 Application(s): stdlib
Related Id(s): PR-6924
Support has been added in ms_transform for the actions
caller_line/0, current_stacktrace/0, and
current_stacktrace/1.
OTP-18495 Application(s): stdlib
Related Id(s): PR-6943
*** HIGHLIGHT ***
The family of enumeration functions in module lists has
been extended with enumerate/3 that allows a step value
to be supplied.
OTP-18500 Application(s): stdlib
*** HIGHLIGHT ***
Update Unicode to version 15.0.0.
OTP-18511 Application(s): otp, stdlib
Related Id(s): PR-7017
The regular expression library powering the re module
is likely to be changed in Erlang/OTP 27. See Upcoming
Potential Incompatibilities.
OTP-18515 Application(s): stdlib
Related Id(s): GH-6990
Improved the performance of sets:subtract/2 when
subtracting a small number of elements.
OTP-18518 Application(s): stdlib
Related Id(s): GH-7015
The linter will no longer raise warnings for
underspecified opaque types.
OTP-18522 Application(s): dialyzer, erts, stdlib
*** HIGHLIGHT ***
Added the new built-in type dynamic() introduced in
EEP-61, improving support for gradual type checkers.
OTP-18537 Application(s): stdlib
Related Id(s): PR-7081
The by gen_statem previously used call proxy process
that was used for preventing late replies from reaching
the client at timeout or connection loss has been
removed. It is no longer needed since process aliases
take care of this, are used, and supported by all
Erlang nodes that an OTP 26 Erlang node can communicate
with.
Full runtime dependencies of stdlib-5.0: compiler-5.0, crypto-4.5,
erts-13.1, kernel-9.0, sasl-3.0
---------------------------------------------------------------------
--- syntax_tools-3.1 ------------------------------------------------
---------------------------------------------------------------------
--- Improvements and New Features ---
OTP-18413 Application(s): compiler, erts, stdlib, syntax_tools,
tools
Related Id(s): EEP-58, PR-6727
*** HIGHLIGHT ***
Map comprehensions as suggested in EEP 58 has now been
implemented.
Full runtime dependencies of syntax_tools-3.1: compiler-7.0,
erts-9.0, kernel-5.0, stdlib-4.0
---------------------------------------------------------------------
--- tftp-1.1 --------------------------------------------------------
---------------------------------------------------------------------
--- Improvements and New Features ---
OTP-18490 Application(s): diameter, inets, mnesia, reltool,
snmp, ssh, tftp, wx
Related Id(s): GH-6339, OTP-18471, PR-6843
*** POTENTIAL INCOMPATIBILITY ***
The implementation has been fixed to use
proc_lib:init_fail/2,3 where appropriate, instead of
proc_lib:init_ack/1,2.
Full runtime dependencies of tftp-1.1: erts-6.0, kernel-6.0,
stdlib-5.0
---------------------------------------------------------------------
--- tools-3.6 -------------------------------------------------------
---------------------------------------------------------------------
--- Improvements and New Features ---
OTP-18413 Application(s): compiler, erts, stdlib, syntax_tools,
tools
Related Id(s): EEP-58, PR-6727
*** HIGHLIGHT ***
Map comprehensions as suggested in EEP 58 has now been
implemented.
OTP-18487 Application(s): runtime_tools, tools
Related Id(s): PR-6829
The instrument module has been moved from tools to
runtime_tools.
Full runtime dependencies of tools-3.6: compiler-5.0, erts-11.0,
erts-9.1, kernel-5.4, runtime_tools-1.8.14, stdlib-3.4
---------------------------------------------------------------------
--- wx-2.3 ----------------------------------------------------------
---------------------------------------------------------------------
--- Improvements and New Features ---
OTP-18350 Application(s): inets, observer, os_mon, reltool, wx
Runtime dependencies have been updated.
OTP-18490 Application(s): diameter, inets, mnesia, reltool,
snmp, ssh, tftp, wx
Related Id(s): GH-6339, OTP-18471, PR-6843
*** POTENTIAL INCOMPATIBILITY ***
The implementation has been fixed to use
proc_lib:init_fail/2,3 where appropriate, instead of
proc_lib:init_ack/1,2.
Full runtime dependencies of wx-2.3: erts-12.0, kernel-8.0,
stdlib-5.0
---------------------------------------------------------------------
---------------------------------------------------------------------
---------------------------------------------------------------------
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