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diff --git a/lib/kernel/doc/src/notes.xml b/lib/kernel/doc/src/notes.xml index cf5777d4be..8188ede6a2 100644 --- a/lib/kernel/doc/src/notes.xml +++ b/lib/kernel/doc/src/notes.xml @@ -4,7 +4,7 @@ <chapter> <header> <copyright> - <year>2004</year><year>2013</year> + <year>2004</year><year>2018</year> <holder>Ericsson AB. All Rights Reserved.</holder> </copyright> <legalnotice> @@ -31,6 +31,1104 @@ </header> <p>This document describes the changes made to the Kernel application.</p> +<section><title>Kernel 6.1</title> + + <section><title>Fixed Bugs and Malfunctions</title> + <list> + <item> + <p> + The values <c>all</c> and <c>none</c> are documented as + valid value for the Kernel configuration parameter + <c>logger_level</c>, but would cause a crash during node + start. This is now corrected.</p> + <p> + Own Id: OTP-15143</p> + </item> + <item> + <p> + Fix some potential buggy behavior in how ticks are sent + on inter node distribution connections. Tick is now sent + to c-node even if there are unsent buffered data, as + c-nodes need ticks in order to send reply ticks. The + amount of sent data was also calculated wrongly when + ticks were suppressed due to unsent buffered data.</p> + <p> + Own Id: OTP-15162 Aux Id: ERIERL-191 </p> + </item> + <item> + <p> + Non semantic change in dist_util.erl to silence dialyzer + warning.</p> + <p> + Own Id: OTP-15170</p> + </item> + <item> + <p> + Fixed <c>net_kernel:connect_node(node())</c> to return + <c>true</c> (and do nothing) as it always has before + OTP-21.0. Also documented this successful "self connect" + as the expected behavior.</p> + <p> + Own Id: OTP-15182 Aux Id: ERL-643 </p> + </item> + <item> + <p> + The single_line option on logger_formatter would in some + cases add an unwanted comma after the association arrows + in a map. This is now corrected.</p> + <p> + Own Id: OTP-15228</p> + </item> + <item> + <p> + Improved robustness of distribution connection setup. In + OTP-21.0 a truly asynchronous connection setup was + introduced. This is further improvement on that work to + make the emulator more robust and also be able to recover + in cases when involved Erlang processes misbehave.</p> + <p> + Own Id: OTP-15297 Aux Id: OTP-15279, OTP-15280 </p> + </item> + </list> + </section> + + + <section><title>Improvements and New Features</title> + <list> + <item> + <p> + A new macro, <c>?LOG(Level,...)</c>, is added. This is + equivalent to the existing <c>?LOG_<LEVEL>(...)</c> + macros.</p> + <p> + A new variant of Logger report callback is added, which + takes an extra argument containing options for size + limiting and line breaks. Module <c>proc_lib</c> in + <c>STDLIB</c> uses this for crash reports.</p> + <p> + Logger configuration is now checked a bit more for + errors.</p> + <p> + Own Id: OTP-15132</p> + </item> + <item> + <p> + The socket options <c>recvtos</c>, <c>recvttl</c>, + <c>recvtclass</c> and <c>pktoptions</c> have been + implemented in the socket modules. See the documentation + for the <c>gen_tcp</c>, <c>gen_udp</c> and <c>inet</c> + modules. Note that support for these in the runtime + system is platform dependent. Especially for + <c>pktoptions</c> which is very Linux specific and + obsoleted by the RFCs that defined it.</p> + <p> + Own Id: OTP-15145 Aux Id: ERIERL-187 </p> + </item> + <item> + <p> + Add <c>logger:set_application_level/2</c> for setting the + logger level of all modules in one application.</p> + <p> + Own Id: OTP-15146</p> + </item> + </list> + </section> + +</section> + +<section><title>Kernel 6.0.1</title> + + <section><title>Fixed Bugs and Malfunctions</title> + <list> + <item> + <p> + Fixed bug in <c>net_kernel</c> that could cause an + emulator crash if certain connection attempts failed. Bug + exists since kernel-6.0 (OTP-21.0).</p> + <p> + Own Id: OTP-15280 Aux Id: ERIERL-226, OTP-15279 </p> + </item> + </list> + </section> + +</section> + +<section><title>Kernel 6.0</title> + + <section><title>Fixed Bugs and Malfunctions</title> + <list> + <item> + <p> Clarify the documentation of <c>rpc:multicall/5</c>. + </p> + <p> + Own Id: OTP-10551</p> + </item> + <item> + <p> + The DNS resolver when getting econnrefused from a server + retained an invalid socket so look up towards the next + server(s) also failed.</p> + <p> + Own Id: OTP-13133 Aux Id: PR-1557 </p> + </item> + <item> + <p> + No resolver backend returns V4Mapped IPv6 addresses any + more. This was inconsistent before, some did, some did + not. To facilitate working with such addresses a new + function <c>inet:ipv4_mapped_ipv6_address/1</c> has been + added.</p> + <p> + *** POTENTIAL INCOMPATIBILITY ***</p> + <p> + Own Id: OTP-13761 Aux Id: ERL-503 </p> + </item> + <item> + <p> + The type specifications for <c>file:posix/0</c> and + <c>inet:posix/0</c> have been updated according to which + errors file and socket operations should be able to + return.</p> + <p> + Own Id: OTP-14019 Aux Id: ERL-550 </p> + </item> + <item> + <p> + Fix name resolving in IPv6 only environments when doing + the initial distributed connection.</p> + <p> + Own Id: OTP-14501</p> + </item> + <item> + <p> File operations used to accept <seealso + marker="kernel:file#type-name_all">filenames</seealso> + containing null characters (integer value zero). This + caused the name to be truncated and in some cases + arguments to primitive operations to be mixed up. + Filenames containing null characters inside the filename + are now <em>rejected</em> and will cause primitive file + operations to fail. </p> <p> Also environment variable + operations used to accept <seealso + marker="kernel:os#type-env_var_name">names</seealso> and + <seealso + marker="kernel:os#type-env_var_value">values</seealso> of + environment variables containing null characters (integer + value zero). This caused operations to silently produce + erroneous results. Environment variable names and values + containing null characters inside the name or value are + now <em>rejected</em> and will cause environment variable + operations to fail. </p> <p>Primitive environment + variable operations also used to accept the <c>$=</c> + character in environment variable names causing various + problems. <c>$=</c> characters in environment variable + names are now also <em>rejected</em>. </p> <p>Also + <seealso + marker="kernel:os#cmd/1"><c>os:cmd/1</c></seealso> now + reject null characters inside its <seealso + marker="kernel:os#type-os_command">command</seealso>. + </p> <p><seealso + marker="erts:erlang#open_port/2"><c>erlang:open_port/2</c></seealso> + will also reject null characters inside the port name + from now on.</p> + <p> + *** POTENTIAL INCOMPATIBILITY ***</p> + <p> + Own Id: OTP-14543 Aux Id: ERL-370 </p> + </item> + <item> + <p><c>os:putenv</c> and <c>os:getenv</c> no longer access + the process environment directly and instead work on a + thread-safe emulation. The only observable difference is + that it's <em>not</em> kept in sync with libc + <c>getenv(3)</c> / <c>putenv(3)</c>, so those who relied + on that behavior in drivers or NIFs will need to add + manual synchronization.</p> <p>On Windows this means that + you can no longer resolve DLL dependencies by modifying + the <c>PATH</c> just before loading the driver/NIF. To + make this less of a problem, the emulator now adds the + target DLL's folder to the DLL search path.</p> + <p> + *** POTENTIAL INCOMPATIBILITY ***</p> + <p> + Own Id: OTP-14666</p> + </item> + <item> + <p> + Fixed connection tick toward primitive hidden nodes + (erl_interface) that could cause faulty tick timeout in + rare cases when payload data is sent to hidden node but + not received.</p> + <p> + Own Id: OTP-14681</p> + </item> + <item> + <p> + Make group react immediately on an EXIT-signal from shell + in e.g ssh.</p> + <p> + Own Id: OTP-14991 Aux Id: PR1705 </p> + </item> + <item> + <p> + Calls to <c>gen_tcp:send/2</c> on closed sockets now + returns <c>{error, closed}</c> instead of + <c>{error,enotconn}</c>.</p> + <p> + Own Id: OTP-15001</p> + </item> + <item> + <p> + The <c>included_applications</c> key are no longer + duplicated as application environment variable. Earlier, + the included applications could be read both with + <c>application:get[_all]_env(...)</c> and + <c>application:get[_all]_key(...)</c> functions. Now, it + can only be read with + <c>application:get[_all]_key(...)</c>.</p> + <p> + *** POTENTIAL INCOMPATIBILITY ***</p> + <p> + Own Id: OTP-15071</p> + </item> + <item> + <p>Owner and group changes through + <c>file:write_file_info</c>, <c>file:change_owner</c>, + and <c>file:change_group</c> will no longer report + success on permission errors.</p> + <p> + *** POTENTIAL INCOMPATIBILITY ***</p> + <p> + Own Id: OTP-15118</p> + </item> + </list> + </section> + + + <section><title>Improvements and New Features</title> + <list> + <item> + <p>A new logging API is added to Erlang/OTP, see the + <seealso + marker="kernel:logger"><c>logger(3)</c></seealso> manual + page, and section <seealso + marker="kernel:logger_chapter">Logging</seealso> in the + Kernel User's Guide.</p> + <p>Calls to <c>error_logger</c> are automatically + redirected to the new API, and legacy error logger event + handlers can still be used. It is, however, recommended + to use the Logger API directly when writing new code.</p> + <p>Notice the following potential incompatibilities:</p> + <list> <item><p>Kernel configuration parameters + <c>error_logger</c> still works, but is overruled if the + default handler's output destination is configured with + Kernel configuration parameter <c>logger</c>.</p> <p>In + general, parameters for configuring error logger are + overwritten by new parameters for configuring + Logger.</p></item> <item><p>The concept of SASL error + logging is deprecated, meaning that by default the SASL + application does not affect which log events are + logged.</p> <p>By default, supervisor reports and crash + reports are logged by the default Logger handler started + by Kernel, and end up at the same destination (terminal + or file) as other standard log event from Erlang/OTP.</p> + <p>Progress reports are not logged by default, but can be + enabled by setting the primary log level to info, for + example with the Kernel configuration parameter + <c>logger_level</c>.</p> <p>To obtain backwards + compatibility with the SASL error logging functionality + from earlier releases, set Kernel configuration parameter + <c>logger_sasl_compatible</c> to <c>true</c>. This + prevents the default Logger handler from logging any + supervisor-, crash-, or progress reports. Instead, SASL + adds a separate Logger handler during application start, + which takes care of these log events. The SASL + configuration parameters <c>sasl_error_logger</c> and + <c>sasl_errlog_type</c> specify the destination (terminal + or file) and severity level to log for these + events.</p></item></list> + <p> + Since Logger is new in Erlang/OTP 21.0, we do reserve the + right to introduce changes to the Logger API and + functionality in patches following this release. These + changes might or might not be backwards compatible with + the initial version.</p> + <p> + *** POTENTIAL INCOMPATIBILITY ***</p> + <p> + Own Id: OTP-13295</p> + </item> + <item> + <p> + The function <c>inet:i/0</c> has been documented.</p> + <p> + Own Id: OTP-13713 Aux Id: PR-1645 </p> + </item> + <item> + <p> + Typespecs for <c>netns</c> and <c>bind_to_device</c> + options have been added to <c>gen_tcp</c>, <c>gen_udp</c> + and <c>gen_sctp</c> functions.</p> + <p> + Own Id: OTP-14359 Aux Id: PR-1816 </p> + </item> + <item> + <p> + New functionality for implementation of alternative + carriers for the Erlang distribution has been introduced. + This mainly consists of support for usage of distribution + controller processes (previously only ports could be used + as distribution controllers). For more information see + <seealso marker="erts:alt_dist#distribution_module">ERTS + User's Guide ➜ How to implement an Alternative Carrier + for the Erlang Distribution ➜ Distribution + Module</seealso>.</p> + <p> + Own Id: OTP-14459</p> + </item> + <item> + <p><c>seq_trace</c> labels may now be any erlang + term.</p> + <p> + Own Id: OTP-14899</p> + </item> + <item> + <p> + The SSL distribution protocol <c>-proto inet_tls</c> has + stopped setting the SSL option + <c>server_name_indication</c>. New verify funs for client + and server in <c>inet_tls_dist</c> has been added, not + documented yet, that checks node name if present in peer + certificate. Usage is still also yet to be documented.</p> + <p> + Own Id: OTP-14969 Aux Id: OTP-14465, ERL-598 </p> + </item> + <item> + <p> + Changed timeout of <c>gen_server</c> calls to <c>auth</c> + server from default 5 seconds to <c>infinity</c>.</p> + <p> + Own Id: OTP-15009 Aux Id: ERL-601 </p> + </item> + <item> + <p>The callback module passed as <c>-epmd_module</c> to + erl has been expanded to be able to do name and port + resolving.</p> <p>Documentation has also been added in + the <seealso + marker="kernel:erl_epmd"><c>erl_epmd</c></seealso> + reference manual and ERTS User's Guide <seealso + marker="erts:alt_disco">How to Implement an Alternative + Service Discovery for Erlang Distribution</seealso>.</p> + <p> + Own Id: OTP-15086 Aux Id: PR-1694 </p> + </item> + <item> + <p> + Included config file specified with relative path in + sys.config are now first searched for relative to the + directory of sys.config itself. If not found, it is also + searched for relative to the current working directory. + The latter is for backwards compatibility.</p> + <p> + Own Id: OTP-15137 Aux Id: PR-1838 </p> + </item> + </list> + </section> + +</section> + +<section><title>Kernel 5.4.3.2</title> + + <section><title>Fixed Bugs and Malfunctions</title> + <list> + <item> + <p> + Non semantic change in dist_util.erl to silence dialyzer + warning.</p> + <p> + Own Id: OTP-15170</p> + </item> + </list> + </section> + +</section> + +<section><title>Kernel 5.4.3.1</title> + + <section><title>Fixed Bugs and Malfunctions</title> + <list> + <item> + <p> + Fix some potential buggy behavior in how ticks are sent + on inter node distribution connections. Tick is now sent + to c-node even if there are unsent buffered data, as + c-nodes need ticks in order to send reply ticks. The + amount of sent data was calculated wrongly when ticks + where suppressed due to unsent buffered data.</p> + <p> + Own Id: OTP-15162 Aux Id: ERIERL-191 </p> + </item> + </list> + </section> + +</section> + +<section><title>Kernel 5.4.3</title> + + <section><title>Fixed Bugs and Malfunctions</title> + <list> + <item> + <p> Correct a few contracts. </p> + <p> + Own Id: OTP-14889</p> + </item> + <item> + <p> + Reject loading modules with names containing directory + separators ('/' or '\' on Windows).</p> + <p> + Own Id: OTP-14933 Aux Id: ERL-564, PR-1716 </p> + </item> + <item> + <p> + Fix bug in handling of os:cmd/2 option max_size on + windows.</p> + <p> + Own Id: OTP-14940</p> + </item> + </list> + </section> + +</section> + +<section><title>Kernel 5.4.2</title> + + <section><title>Fixed Bugs and Malfunctions</title> + <list> + <item> + <p> + Add <c>os:cmd/2</c> that takes an options map as the + second argument.</p> + <p> + Add <c>max_size</c> as an option to <c>os:cmd/2</c> that + control the maximum size of the result that + <c>os:cmd/2</c> will return.</p> + <p> + Own Id: OTP-14823</p> + </item> + </list> + </section> + +</section> + +<section><title>Kernel 5.4.1</title> + + <section><title>Fixed Bugs and Malfunctions</title> + <list> + <item> + <p> + Refactored an internal API.</p> + <p> + Own Id: OTP-14784</p> + </item> + </list> + </section> + +</section> + +<section><title>Kernel 5.4</title> + + <section><title>Fixed Bugs and Malfunctions</title> + <list> + <item> + <p> + Processes which did output after switching jobs (Ctrl+G) + could be left forever stuck in the io request.</p> + <p> + Own Id: OTP-14571 Aux Id: ERL-472 </p> + </item> + </list> + </section> + + + <section><title>Improvements and New Features</title> + <list> + <item> + <p>Lock counting can now be fully toggled at runtime in + the lock counting emulator (<c>-emu_type lcnt</c>). + Everything is enabled by default to match the old + behavior, but specific categories can be toggled at will + with minimal runtime overhead when disabled. Refer to the + documentation on <c>lcnt:rt_mask/1</c> for details.</p> + <p> + Own Id: OTP-13170</p> + </item> + <item> + <p><c>lcnt:collect</c> and <c>lcnt:clear</c> will no + longer block all other threads in the runtime system.</p> + <p> + Own Id: OTP-14412</p> + </item> + <item> + <p> + General Unicode improvements.</p> + <p> + Own Id: OTP-14462</p> + </item> + </list> + </section> + +</section> + +<section><title>Kernel 5.3.1</title> + + <section><title>Fixed Bugs and Malfunctions</title> + <list> + <item> + <p>The documentation for the 'quiet' option in + disk_log:open/1 had an incorrect default value.</p> + <p> + Own Id: OTP-14498</p> + </item> + </list> + </section> + +</section> + +<section><title>Kernel 5.3</title> + + <section><title>Fixed Bugs and Malfunctions</title> + <list> + <item> + <p>Function <c>inet:ntoa/1</c> has been fixed to return + lowercase letters according to RFC 5935 that has been + approved after this function was written. Previously + uppercase letters were returned so this may be a + backwards incompatible change depending on how the + returned address string is used.</p> + <p>Function <c>inet:parse_address/1</c> has been fixed to + accept %-suffixes on scoped addresses. The addresses does + not work yet, but gives no parse errors.</p> + <p> + *** POTENTIAL INCOMPATIBILITY ***</p> + <p> + Own Id: OTP-13006 Aux Id: ERIERL-20, ERL-429 </p> + </item> + <item> + <p> + Fix bug where gethostname would incorrectly fail with + enametoolong on Linux.</p> + <p> + Own Id: OTP-14310</p> + </item> + <item> + <p> + Fix bug causing <c>code:is_module_native</c> to falsely + return true when <c>local</c> call trace is enabled for + the module.</p> + <p> + Own Id: OTP-14390</p> + </item> + <item> + <p> + Add early reject of invalid node names from distributed + nodes.</p> + <p> + Own Id: OTP-14426</p> + </item> + </list> + </section> + + + <section><title>Improvements and New Features</title> + <list> + <item> + <p> + Since Unicode is now allowed in atoms an extra check is + needed for node names, which are restricted to Latin-1.</p> + <p> + Own Id: OTP-13805</p> + </item> + <item> + <p>Replaced usage of deprecated symbolic <seealso + marker="erts:erlang#type-time_unit"><c>time + unit</c></seealso> representations.</p> + <p> + Own Id: OTP-13831 Aux Id: OTP-13735 </p> + </item> + <item> + <p><c>file:write_file(Name, Data, [raw])</c> would turn + <c>Data</c> into a single binary before writing. This + meant it could not take advantage of the <c>writev()</c> + system call if it was given a list of binaries and told + to write with <c>raw</c> mode.</p> + <p> + Own Id: OTP-13909</p> + </item> + <item> + <p>The performance of the <c>disk_log</c> has been + somewhat improved in some corner cases (big items), and + the documentation has been clarified. </p> + <p> + Own Id: OTP-14057 Aux Id: PR-1245 </p> + </item> + <item> + <p>Functions for detecting changed code has been added. + <c>code:modified_modules/0</c> returns all currently + loaded modules that have changed on disk. + <c>code:module_status/1</c> returns the status for a + module. In the shell and in <c>c</c> module, <c>mm/0</c> + is short for <c>code:modified_modules/0</c>, and + <c>lm/0</c> reloads all currently loaded modules that + have changed on disk.</p> + <p> + Own Id: OTP-14059</p> + </item> + <item> + <p> + Introduce an event manager in Erlang to handle OS + signals. A subset of OS signals may be subscribed to and + those are described in the Kernel application.</p> + <p> + Own Id: OTP-14186</p> + </item> + <item> + <p> Sockets can now be bound to device (SO_BINDTODEVICE) + on platforms where it is supported. </p> <p> This has + been implemented e.g to support VRF-Lite under Linux; see + <url + href="https://www.kernel.org/doc/Documentation/networking/vrf.txt"> + VRF </url>, and GitHub pull request <url + href="https://github.com/erlang/otp/pull/1326">#1326</url>. + </p> + <p> + Own Id: OTP-14357 Aux Id: PR-1326 </p> + </item> + <item> + <p> + Added option to store shell_history on disk so that the + history can be reused between sessions.</p> + <p> + Own Id: OTP-14409 Aux Id: PR-1420 </p> + </item> + <item> + <p> The size of crash reports created by + <c>gen_server</c>, <c>gen_statem</c> and <c>proc_lib</c> + is limited with aid of the Kernel application variable + <c>error_logger_format_depth</c>. The purpose is to limit + the size of the messages sent to the <c>error_logger</c> + process when processes with huge message queues or states + crash. </p> <p>The crash report generated by + <c>proc_lib</c> includes the new tag + <c>message_queue_len</c>. The neighbour report also + includes the new tag <c>current_stacktrace</c>. Finally, + the neighbour report no longer includes the tags + <c>messages</c> and <c>dictionary</c>. </p> <p> The new + function <c>error_logger:get_format_depth/0</c> can be + used to retrieve the value of the Kernel application + variable <c>error_logger_format_depth</c>. </p> + <p> + Own Id: OTP-14417</p> + </item> + <item> + <p> One of the ETS tables used by the <c>global</c> + module is created with <c>{read_concurrency, true}</c> in + order to reduce contention. </p> + <p> + Own Id: OTP-14419</p> + </item> + <item> + <p> + Warnings have been added to the relevant documentation + about not using un-secure distributed nodes in exposed + environments.</p> + <p> + Own Id: OTP-14425</p> + </item> + </list> + </section> + +</section> + +<section><title>Kernel 5.2</title> + + <section><title>Fixed Bugs and Malfunctions</title> + <list> + <item> + <p> + Fix a race during cleanup of os:cmd that would cause + os:cmd to hang indefinitely.</p> + <p> + Own Id: OTP-14232 Aux Id: seq13275 </p> + </item> + </list> + </section> + + + <section><title>Improvements and New Features</title> + <list> + <item> + <p>The functions in the '<c>file</c>' module that take a + list of paths (e.g. <c>file:path_consult/2</c>) will now + continue to search in the path if the path contains + something that is not a directory.</p> + <p> + Own Id: OTP-14191</p> + </item> + <item> + <p>Two OTP processes that are known to receive many + messages are 'rex' (used by 'rpc') and 'error_logger'. + Those processes will now store unprocessed messages + outside the process heap, which will potentially decrease + the cost of garbage collections.</p> + <p> + Own Id: OTP-14192</p> + </item> + </list> + </section> + +</section> + +<section><title>Kernel 5.1.1</title> + + <section><title>Fixed Bugs and Malfunctions</title> + <list> + <item> + <p> + <c>code:add_pathsa/1</c> and command line option + <c>-pa</c> both revert the given list of directories when + adding it at the beginning of the code path. This is now + documented.</p> + <p> + Own Id: OTP-13920 Aux Id: ERL-267 </p> + </item> + <item> + <p> + Add lost runtime dependency to erts-8.1. This should have + been done in kernel-5.1 (OTP-19.1) as it cannot run + without at least erts-8.1 (OTP-19.1).</p> + <p> + Own Id: OTP-14003</p> + </item> + <item> + <p> + Type and doc for gen_{tcp,udp,sctp}:controlling_process/2 + has been improved.</p> + <p> + Own Id: OTP-14022 Aux Id: PR-1208 </p> + </item> + </list> + </section> + +</section> + +<section><title>Kernel 5.1</title> + + <section><title>Fixed Bugs and Malfunctions</title> + <list> + <item> + <p> + Fix a memory leak when calling + seq_trace:get_system_tracer().</p> + <p> + Own Id: OTP-13742</p> + </item> + <item> + <p> + Fix for the problem that when adding the ebin directory + of an application to the code path, the + <c>code:priv_dir/1</c> function returns an incorrect path + to the priv directory of the same application.</p> + <p> + Own Id: OTP-13758 Aux Id: ERL-195 </p> + </item> + <item> + <p> + Fix code_server crash when adding code paths of two + levels.</p> + <p> + Own Id: OTP-13765 Aux Id: ERL-194 </p> + </item> + <item> + <p> + Respect -proto_dist switch while connection to EPMD</p> + <p> + Own Id: OTP-13770 Aux Id: PR-1129 </p> + </item> + <item> + <p> + Fixed a bug where init:stop could deadlock if a process + with infinite shutdown timeout (e.g. a supervisor) + attempted to load code while terminating.</p> + <p> + Own Id: OTP-13802</p> + </item> + <item> + <p> + Close stdin of commands run in os:cmd. This is a + backwards compatibility fix that restores the behaviour of + pre 19.0 os:cmd.</p> + <p> + Own Id: OTP-13867 Aux Id: seq13178 </p> + </item> + </list> + </section> + + + <section><title>Improvements and New Features</title> + <list> + <item> + <p> + Add <c>net_kernel:setopts/2</c> and + <c>net_kernel:getopts/2</c> to control options for + distribution sockets in runtime.</p> + <p> + Own Id: OTP-13564</p> + </item> + <item> + <p> + Rudimentary support for DSCP has been implemented + in the guise of a <c>tclass</c> socket option + for IPv6 sockets.</p> + <p> + Own Id: OTP-13582</p> + </item> + </list> + </section> + +</section> + +<section><title>Kernel 5.0.2</title> + + <section><title>Fixed Bugs and Malfunctions</title> + <list> + <item> + <p> + When calling os:cmd from a process that has set trap_exit + to true an 'EXIT' message would be left in the message + queue. This bug was introduced in kernel vsn 5.0.1.</p> + <p> + Own Id: OTP-13813</p> + </item> + </list> + </section> + +</section> + +<section><title>Kernel 5.0.1</title> + + <section><title>Fixed Bugs and Malfunctions</title> + <list> + <item> + <p> + Fix a os:cmd bug where creating a background job using + & would cause os:cmd to hang until the background job + terminated or closed its stdout and stderr file + descriptors. This bug has existed from kernel 5.0.</p> + <p> + Own Id: OTP-13741</p> + </item> + </list> + </section> + +</section> + +<section><title>Kernel 5.0</title> + + <section><title>Fixed Bugs and Malfunctions</title> + <list> + <item> + <p>The handling of <c>on_load</c> functions has been + improved. The major improvement is that if a code upgrade + fails because the <c>on_load</c> function fails, the + previous version of the module will now be retained.</p> + <p> + Own Id: OTP-12593</p> + </item> + <item> + <p><c>rpc:call()</c> and <c>rpc:block_call()</c> would + sometimes cause an exception (which was not mentioned in + the documentation). This has been corrected so that + <c>{badrpc,Reason}</c> will be returned instead.</p> + <p> + Own Id: OTP-13409</p> + </item> + <item> + <p>On Windows, for modules that were loaded early (such + as the <c>lists</c> module), <c>code:which/1</c> would + return the path with mixed slashes and backslashes, for + example: <c>"C:\\Program + Files\\erl8.0/lib/stdlib-2.7/ebin/lists.beam"</c>. This + has been corrected.</p> + <p> + Own Id: OTP-13410</p> + </item> + <item> + <p> + Make file:datasync use fsync instead of fdatasync on Mac + OSX.</p> + <p> + Own Id: OTP-13411</p> + </item> + <item> + <p> + The default chunk size for the fallback sendfile + implementation, used on platforms that do not have a + native sendfile, has been decreased in order to reduce + connectivity issues.</p> + <p> + Own Id: OTP-13444</p> + </item> + <item> + <p> + Large file writes (2Gb or more) could fail on some Unix + platforms (for example, OS X and FreeBSD).</p> + <p> + Own Id: OTP-13461</p> + </item> + <item> + <p> + A bug has been fixed where the DNS resolver inet_res did + not refresh its view of the contents of for example + resolv.conf immediately after start and hence then failed + name resolution. Reported and fix suggested by Michal + Ptaszek in GitHUB pull req #949.</p> + <p> + Own Id: OTP-13470 Aux Id: Pull #969 </p> + </item> + <item> + <p> + Fix process leak from global_group.</p> + <p> + Own Id: OTP-13516 Aux Id: PR-1008 </p> + </item> + <item> + <p> + The function <c>inet:gethostbyname/1</c> now honors the + resolver option <c>inet6</c> instead of always looking up + IPv4 addresses.</p> + <p> + *** POTENTIAL INCOMPATIBILITY ***</p> + <p> + Own Id: OTP-13622 Aux Id: PR-1065 </p> + </item> + <item> + <p> + The <c>Status</c> argument to <c>init:stop/1</c> is now + sanity checked to make sure <c>erlang:halt</c> does not + fail.</p> + <p> + Own Id: OTP-13631 Aux Id: PR-911 </p> + </item> + </list> + </section> + + + <section><title>Improvements and New Features</title> + <list> + <item> + <p> + Add {line_delim, byte()} option to inet:setopts/2 and + decode_packet/3</p> + <p> + Own Id: OTP-12837</p> + </item> + <item> + <p> + Added <seealso + marker="kernel:os#perf_counter/1">os:perf_counter/1</seealso>.</p> + <p> + The perf_counter is a very very cheap and high resolution + timer that can be used to timestamp system events. It + does not have monoticity guarantees, but should on most + OS's expose a monotonous time.</p> + <p> + Own Id: OTP-12908</p> + </item> + <item> + <p> + The os:cmd call has been optimized on unix platforms to + be scale better with the number of schedulers.</p> + <p> + Own Id: OTP-13089</p> + </item> + <item> + <p>New functions that can load multiple modules at once + have been added to the '<c>code</c>' module. The + functions are <c>code:atomic_load/1</c>, + <c>code:prepare_loading/1</c>, + <c>code:finish_loading/1</c>, and + <c>code:ensure_modules_loaded/1</c>.</p> + <p> + Own Id: OTP-13111</p> + </item> + <item> + <p> + The code path cache feature turned out not to be very + useful in practice and has been removed. If an attempt is + made to enable the code path cache, there will be a + warning report informing the user that the feature has + been removed.</p> + <p> + Own Id: OTP-13191</p> + </item> + <item> + <p>When an attempt is made to start a distributed Erlang + node with the same name as an existing node, the error + message will be much shorter and easier to read than + before. Example:</p> + <p><c>Protocol 'inet_tcp': the name somename@somehost + seems to be in use by another Erlang node</c></p> + <p> + Own Id: OTP-13294</p> + </item> + <item> + <p> + The output of the default error logger is somewhat + prettier and easier to read. The default error logger is + used during start-up of the OTP system. If the start-up + fails, the output will be easier to read.</p> + <p> + Own Id: OTP-13325</p> + </item> + <item> + <p>The functions <c>rpc:safe_multi_server_call/2,3</c> + that were deprecated in R12B have been removed.</p> + <p> + *** POTENTIAL INCOMPATIBILITY ***</p> + <p> + Own Id: OTP-13449</p> + </item> + <item> + <p> + Update the error reasons in dist_util, and show them in + the logs if net_kernel:verbose(1) has been called.</p> + <p> + Own Id: OTP-13458</p> + </item> + <item> + <p> + Experimental support for Unix Domain Sockets has been + implemented. Read the sources if you want to try it out. + Example: <c>gen_udp:open(0, + [{ifaddr,{local,"/tmp/socket"}}])</c>. Documentation will + be written after user feedback on the experimental API.</p> + <p> + Own Id: OTP-13572 Aux Id: PR-612 </p> + </item> + <item> + <p> + Allow heart to be configured to not kill the previous + emulator before calling the HEART_COMMAND. This is done + by setting the environment variable HEART_NO_KILL to + TRUE.</p> + <p> + Own Id: OTP-13650</p> + </item> + </list> + </section> + +</section> + <section><title>Kernel 4.2</title> <section><title>Fixed Bugs and Malfunctions</title> @@ -623,8 +1721,7 @@ Erlang/OTP has been ported to the realtime operating system OSE. The port supports both smp and non-smp emulator. For details around the port and how to started - see the User's Guide in the <seealso - marker="ose:ose_intro">ose</seealso> application. </p> + see the User's Guide in the ose application. </p> <p> Note that not all parts of Erlang/OTP has been ported. </p> <p> @@ -1113,7 +2210,7 @@ dependent, so applications aiming to be portable should consider using <c>{ipv6_v6only,true}</c> when creating an <c>inet6</c> listening/destination socket, and if - neccesary also create an <c>inet</c> socket on the same + necessary also create an <c>inet</c> socket on the same port for IPv4 traffic. See the documentation.</p> <p> Own Id: OTP-8928 Aux Id: kunagi-193 [104] </p> @@ -3251,7 +4348,7 @@ types (for instance, <c>ensure_loaded/1</c> now only accepts an atom as documented; it used to accept a string too).</p> - <p><c>Dialyzer</c> will generally emit warnings for any + <p>Dialyzer will generally emit warnings for any calls that use undocumented argument types. Even if the call happens to still work in R12B, you should correct your code. A future release will adhere to the |