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</header>
<p>This document describes the changes made to the Kernel application.</p>
+<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>
+ 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>
+ Huges 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. Thanks to Xuming who
+ reported and fixed this!</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>
+ 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 more performant as the number of schedulers increase.</p>
+ <p>
+ Own Id: OTP-13089</p>
+ </item>
+ <item>
+ <p>New functions that can load multiple functions 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 startup 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>
+ </list>
+ </section>
+
+</section>
+
<section><title>Kernel 4.2</title>
<section><title>Fixed Bugs and Malfunctions</title>