diff options
Diffstat (limited to 'lib/kernel/doc/src/notes.xml')
| -rw-r--r-- | lib/kernel/doc/src/notes.xml | 512 |
1 files changed, 512 insertions, 0 deletions
diff --git a/lib/kernel/doc/src/notes.xml b/lib/kernel/doc/src/notes.xml index 2a2992b720..6745b82885 100644 --- a/lib/kernel/doc/src/notes.xml +++ b/lib/kernel/doc/src/notes.xml @@ -31,6 +31,518 @@ </header> <p>This document describes the changes made to the Kernel application.</p> +<section><title>Kernel 9.0</title> + + <section><title>Fixed Bugs and Malfunctions</title> + <list> + <item> + <p> + Fixed a bug where duplicate keys were allowed in the .app + file of an application. Duplicate keys are now rejected + and the application will not start if they exist.</p> + <p> + *** POTENTIAL INCOMPATIBILITY ***</p> + <p> + Own Id: OTP-18210 Aux Id: GH-5877 PR-5878 </p> + </item> + <item> + <p> + Fix inconsistent handling in logger_formatter of the + branched values in conditional branches. For example + using <c>msg</c> in a conditional branch would not be + formatted as it should before this fix.</p> + <p> + Own Id: OTP-18225 Aux Id: PR-6036 </p> + </item> + <item> + <p> + Fix the logger_std_h handler to log to standard_error if + logging to standard_io fails for any reason.</p> + <p> + Own Id: OTP-18226 Aux Id: PR-6253 </p> + </item> + <item> + <p> + Fix the TLS distribution to work when starting Erlang in + embedded mode and a connection is done before kernel is + fully started.</p> + <p> + Own Id: OTP-18248 Aux Id: PR-6227 GH-6085 </p> + </item> + <item> + <p> + erl <c>-remsh</c> has been improved to provide better + error reasons and work when using a shell without + terminal support (that is an "oldshell").</p> + <p> + Own Id: OTP-18271 Aux Id: PR-6279 </p> + </item> + <item> + <p> + 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.</p> + <p> + Own Id: OTP-18286 Aux Id: PR-5955 </p> + </item> + <item> + <p> <c>proc_lib:start*/*</c> has become synchronous when + the started process fails. This requires that a failing + process use a new function <c>proc_lib:init_fail/2,3</c>, + or exits, to indicate failure. All OTP behaviours have + been fixed to do this. </p><p> All these start functions + now consume the <c>'EXIT'</c> message from a process link + for all error returns. Previously it was only the + <c>start_link/*</c> functions that did this, and only + when the started function exited, not when it used + <c>init_ack/1,2</c> or <c>init_fail/2,3</c> to create the + return value. </p> + <p> + *** POTENTIAL INCOMPATIBILITY ***</p> + <p> + Own Id: OTP-18471 Aux Id: GH-6339, PR-6843 </p> + </item> + <item> + <p>Fixed a bug where <c>file:read(standard_io, ...)</c> + unexpectedly returned <c>eof</c> in binary mode.</p> + <p> + Own Id: OTP-18486 Aux Id: PR-6881 </p> + </item> + <item> + <p> + Return type for <c>seq_trace:get_token/1</c> fixed.</p> + <p> + Own Id: OTP-18528 Aux Id: PR-7009 </p> + </item> + <item> + <p> + Looking up, connecting to and sending to a host with an + empty name is now handled by trying to look up the + address of the root domain, which fails. Previously some + of these operations caused an internal exception, which + contradicted type specifications.</p> + <p> + Own Id: OTP-18543 Aux Id: GH-6353 </p> + </item> + <item> + <p> + 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.</p> + <p> + Own Id: OTP-18547 Aux Id: PR-7092 </p> + </item> + </list> + </section> + + + <section><title>Improvements and New Features</title> + <list> + <item> + <p>The Erlang shell has been improved to support the + following features:</p> <list> <item>Auto-complete + variables, record names, record field names, map keys, + function parameter types and filenames.</item> <item>Open + external editor in the shell (with C-o) to edit the + current expression in an editor.</item> <item>Support + defining records (with types), functions and function + typespecs, and custom types in the shell.</item> <item>Do + not save pager commands, and input to io:getline in + history.</item> </list> + <p> + Own Id: OTP-14835 Aux Id: PR-5924 </p> + </item> + <item> + <p>The TTY/terminal subsystem has been rewritten by + moving more code to Erlang from the old linked-in driver + and implementing all the I/O primitives needed in a NIF + instead. </p><p> 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. + </p><p> 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. </p><p> The + re-write brings with it a number of bug fixes and feature + additions:</p> <list> <item>The TTY is now reset when + Erlang exits, fixing zsh to not break when terminating an + Erlang session.</item> <item><c>standard_error</c> now + uses the same unicode mode as <c>standard_io</c>.</item> + <item>Hitting backspace when searching the shell history + with an empty search string no longer breaks the + shell.</item> <item>Tab expansion now works on remote + nodes started using the JCL interface.</item> <item>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.</item> <item>Added shell:start_interactive + for starting the interactive shell from a non-interactive + Erlang session (for example an escript).</item> <item>On + Windows, when starting in detached mode the standard + handler are now set to <c>nul</c> devices instead of + being unset.</item> <item> Standard I/O now always + defaults to <c>unicode</c> mode if supported. Previously + the default was <c>latin1</c> if the runtime system had + been started with <c>-oldshell</c> or <c>-noshell</c> + (for example in an <c>escript</c>). To send raw bytes + over standard out, one now explicitly has to specify + <c>io:setopts(standard_io, [{encoding, latin1}]).</c> + </item> </list> + <p> + *** POTENTIAL INCOMPATIBILITY ***</p> + <p> + Own Id: OTP-17932 Aux Id: PR-6144 GH-3150 GH-3390 GH-4343 + GH-4225 </p> + </item> + <item> + <p>Add support for socket on Windows.</p> <list> + <item>Pre release status.</item> <item>Error codes not + finalized.</item> <item>No explicit support for Windows + specific options (socket options, flags for read and + write).</item> <item>New async api for Windows + (completion). See the <c>Asynchronous calls</c> chapter + in the (Socket Usage) Users Guide.</item> <item>To ensure + platform independence, gen_tcp and gen_udp is + <em>intended</em> to be used (not yet updated).</item> + </list> + <p> + Own Id: OTP-18029</p> + </item> + <item> + <p>As announced since the release of OTP 24, support + for:</p> <list> <item><p> 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 <seeguide + marker="erts:erl_dist_protocol#DFLAG_V4_NC"><c>DFLAG_V4_NC</c></seeguide> + is therefor now also mandatory. OTP has since OTP 24 + supported this. Also note that the external format + produced by <c>term_to_binary()</c> and + <c>term_to_iovec()</c> will unconditionally produce pids, + ports, and references supporting this larger format. + </p></item> <item><p> the <seeguide + marker="erts:erl_dist_protocol#new_link_protocol">new + link protocol</seeguide> introduced in OTP 23.3 is now + mandatory. The distribution flag <seeguide + marker="erts:erl_dist_protocol#DFLAG_UNLINK_ID"><c>DFLAG_UNLINK_ID</c></seeguide> + is therefor now also mandatory. </p></item> </list> + <p>Due to the above, OTP 26 nodes will refuse to connect + to OTP nodes from releases prior to OTP 24.</p> + <p> + *** POTENTIAL INCOMPATIBILITY ***</p> + <p> + Own Id: OTP-18140 Aux Id: PR-6072 </p> + </item> + <item> + <p> Support for Kernel TLS (kTLS), has been added to the + SSL application, for TLS distribution (<c>-proto_dist + inet_tls</c>), the SSL option <c>{ktls, true}</c>. Using + this for general SSL sockets is uncomfortable, + undocumented and not recommended since it requires very + platform dependent raw options. </p><p> 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 <c>tls</c> is + required. </p> + <p> + Own Id: OTP-18235 Aux Id: PR-6104, PR-5840 </p> + </item> + <item> + <p> + Add code:get_doc/2 which adds support to fetch + documentation skeletons of functions using debug_info + chunks instead of eep48 doc chunks.</p> + <p> + Own Id: OTP-18261 Aux Id: PR-5924 </p> + </item> + <item> + <p> + The Erlang shell's auto-completion when typing <c>tab</c> + has been changed to happen after the editing current line + instead of before it.</p> + <p> + This behaviour can be configured using a the + <c>shell_expand_location</c> STDLIB configuration + parameter.</p> + <p> + Own Id: OTP-18278 Aux Id: PR-6260 </p> + </item> + <item> + <p> + Typing <c>Ctrl+L</c> 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 <c>Alt+L</c>. This brings the behaviour of + <c>Ctrl+L</c> closer to how bash and other shells work.</p> + <p> + *** POTENTIAL INCOMPATIBILITY ***</p> + <p> + Own Id: OTP-18285 Aux Id: PR-6262 </p> + </item> + <item> + <p> + gen_server optimized by caching callback functions</p> + <p> + Own Id: OTP-18305 Aux Id: PR-5831 </p> + </item> + <item> + <p> + Prepare the <c>pg</c> communication protocol for upgrade. + The plan is for OTP-28 nodes to be able to use an + upgraded <c>pg</c> protocol while still being able to + talk with OTP 26 nodes.</p> + <p> + Own Id: OTP-18327 Aux Id: PR-6433 </p> + </item> + <item> + <p> + New <c>disk_log</c> log type <c>rotate</c>, where the log + files are compressed upon rotation.</p> + <p> + Own Id: OTP-18331 Aux Id: ERIERL-870 </p> + </item> + <item> + <p>The following <seemfa + marker="kernel:inet#setopts/2"><c>inet:setopts/2</c></seemfa> + options have been introduced:</p> <taglist> <tag><seeerl + marker="kernel:inet#option-reuseport"><c>reuseport</c></seeerl></tag> + <item><p>Reuse of local port. Load balancing may or may + not be provided depending on underlying OS.</p></item> + <tag><seeerl + marker="kernel:inet#option-reuseport_lb"><c>reuseport_lb</c></seeerl></tag> + <item><p>Reuse of local port. Load balancing + provided.</p></item> <tag><seeerl + marker="kernel:inet#option-exclusiveaddruse"><c>exclusiveaddruse</c></seeerl></tag> + <item><p>Exclusive address/port usage on Windows. This + socket option is Windows specific and will silently be + ignored on other systems.</p></item> </taglist> <p>The + behavior of setting <seeerl + marker="kernel:inet#option-reuseaddr"><c>reuseaddr</c></seeerl> + on Windows have changed in a <em>backwards + incompatible</em> way. The underlying <c>SO_REUSEADDR</c> + socket option is now only set if both the <c>reusaddr</c> + and the <c>reuseport</c> <c>inet</c> options have been + set. This since the underlying <c>SO_REUSEADDR</c> socket + option on Windows behaves similar to how BSD behaves if + both the underlying socket options <c>SO_REUSEADDR</c> + and <c>SO_REUSEPORT</c> have been set. See the + documentation of the <c>reuseaddr</c> option for more + information.</p> + <p> + *** POTENTIAL INCOMPATIBILITY ***</p> + <p> + Own Id: OTP-18344 Aux Id: PR-6522, PR-6944, OTP-18324, + PR-6481, GH-6461 </p> + </item> + <item> + <p> + Replace size/1 with either tuple_size/1 or byte_size/1</p> + <p> + The <c>size/1</c> BIF is not optimized by the JIT, and + its use can result in worse types for Dialyzer.</p> + <p> + When one knows that the value being tested must be a + tuple, <c>tuple_size/1</c> should always be preferred.</p> + <p> + When one knows that the value being tested must be a + binary, <c>byte_size/1</c> should be preferred. However, + <c>byte_size/1</c> also accepts a bitstring (rounding up + size to a whole number of bytes), so one must make sure + that the call to <c>byte_size/</c> is preceded by a call + to <c>is_binary/1</c> to ensure that bitstrings are + rejected. Note that the compiler removes redundant calls + to <c>is_binary/1</c>, 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 <c>is_binary/1</c> + test immediately before the call to <c>byte_size/1</c>.</p> + <p> + Own Id: OTP-18405 Aux Id: + GH-6672,PR-6702,PR-6768,PR-6700,PR-6769,PR-6812,PR-6814 </p> + </item> + <item> + <p>The function <c>file:pid2name/1</c> is deprecated and + will be removed in Erlang/OTP 27.</p> + <p> + Own Id: OTP-18419</p> + </item> + <item> + <p> + The modules Erlang DNS resolver <c>inet_res</c> and + helper modules have been updated for RFC6891; to handle + OPT RR with DNSSEC OK (DO) bit.</p> + <p> + Own Id: OTP-18442 Aux Id: PR-6786, GH-6606 </p> + </item> + <item> + <p> + Introduced <seemfa + marker="kernel:application#get_supervisor/1"><c>application:get_supervisor/1</c></seemfa>.</p> + <p> + Own Id: OTP-18444 Aux Id: PR-6035 </p> + </item> + <item> + <p> Handling of <c>on_load</c> modules during boot has + been improved by adding an extra step in the boot order + for embedded mode that runs all <c>on_load</c> handlers, + instead of relying on explicit invocation of them, later, + when the kernel supervision tree starts. </p><p> This is + mostly a code improvement and OTP internal simplification + to avoid future bugs and to simplify code maintenance. + </p> + <p> + Own Id: OTP-18447</p> + </item> + <item> + <p> + Reduce contention on the code_server by doing the code + preparation on the client.</p> + <p> + Own Id: OTP-18448 Aux Id: PR-6736 </p> + </item> + <item> + <p> + Added a mode to ensure_all_loaded, to start children + application and their dependencies concurrently.</p> + <p> + Own Id: OTP-18451 Aux Id: PR-6737 </p> + </item> + <item> + <p> + 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.</p> + <p> + Own Id: OTP-18452 Aux Id: PR-6729 </p> + </item> + <item> + <p> + 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.</p> + <p> + Own Id: OTP-18456</p> + </item> + <item> + <p> + Add cache attribute to code path apis.</p> + <p> + 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.</p> + <p> + Own Id: OTP-18466 Aux Id: PR-6832 </p> + </item> + <item> + <p> + Deprecates <c>dbg:stop_clear/0</c> because it is simply a + function alias to <c>dbg:stop/0</c></p> + <p> + Own Id: OTP-18478 Aux Id: GH-6903 </p> + </item> + <item> + <p> + 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.</p> + <p> + Own Id: OTP-18484 Aux Id: PR-6844 </p> + </item> + <item> + <p> + The internal DNS resolver has been updated to handle DNS + LOC RR:s (RFC 1876). This is an undocumented module, + although still used by power users. See the source code.</p> + <p> + Own Id: OTP-18510 Aux Id: GH-6098, PR-6982 </p> + </item> + <item> + <p> + Reduced memory consumption in <c>global</c> when + informing other nodes about lost connections.</p> + <p> + Own Id: OTP-18521 Aux Id: PR-7025 </p> + </item> + <item> + <p> + The <c>net_kernel</c>, <c>global</c>, and + <c>global_group</c> servers now have <seeerl + marker="erts:erlang#process_flag_async_dist"><i>fully + asynchronous distributed signaling</i></seeerl> enabled + all the time which prevents them from ever getting + blocked on send of distributed signals.</p> + <p> + Documentation about blocking distributed signals has also + been improved.</p> + <p> + Own Id: OTP-18533 Aux Id: PR-7061 </p> + </item> + <item> + <p> + Allow IPv6 addresses as host in <c>http</c> packets + decoded by <c>erlang:decode_packet/3</c> and + <c>gen_tcp</c> packet option. The IPv6 address should be + enclosed within <c>[]</c> according to RFC2732.</p> + <p> + Own Id: OTP-18540 Aux Id: PR-6900 </p> + </item> + <item> + <p> + Remove deprecated functions in OTP-26</p> + <p> + Own Id: OTP-18542</p> + </item> + <item> + <p> + Removed <c>code:is_module_native/1</c> since HiPE has + been removed. It has since OTP 24 been deprecated and + scheduled for removal in OTP 26. </p> + <p> + Removed <c>code:rehash/0</c> 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.</p> + <p> + *** POTENTIAL INCOMPATIBILITY ***</p> + <p> + Own Id: OTP-18551 Aux Id: PR-7106 </p> + </item> + <item> + <p>Added support for multiple line expressions and + navigation in the shell. Added new keybindings:</p> + <list> <item> navigate up (ctrl+up)/(alt+up) </item> + <item> navigate down (ctrl+down)/(alt+down) </item> + <item> insert newline in middle of line (alt+enter) + </item> <item> navigate top (alt+<)/(alt+shift+up) + </item> <item> navigate bottom + (alt+>)/(alt+shift+down) </item> <item> clear current + expression (alt+c) </item> <item> cancel search (alt+c) + </item> <item> opening editor on mac (option+o)/(alt+o) + </item> </list> <p>Modifies the prompt for new lines to + make it clearer that the prompt has entered multi-line + mode. Supports terminal with small window size, recommend + not go lower than 7 rows and 40 columns. Modifies the + search prompt to support multi-line statements. Redraw + the prompt after continuing from JCL menu. </p> + <p> + Own Id: OTP-18575 Aux Id: PR-7169 </p> + </item> + </list> + </section> + +</section> + <section><title>Kernel 8.5.4</title> <section><title>Fixed Bugs and Malfunctions</title> |