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</header>
<p>This document describes the changes made to the Kernel application.</p>
+<section><title>Kernel 6.3</title>
+
+ <section><title>Fixed Bugs and Malfunctions</title>
+ <list>
+ <item>
+ <p>
+ If for example the <c>/etc/hosts</c> did not come into
+ existence until after the kernel application had started,
+ its content was never read. This bug has now been
+ corrected.</p>
+ <p>
+ Own Id: OTP-14702 Aux Id: PR-2066 </p>
+ </item>
+ <item>
+ <p>
+ Fix bug where doing <c>seq_trace:reset_trace()</c> while
+ another process was doing a garbage collection could
+ cause the run-time system to segfault.</p>
+ <p>
+ Own Id: OTP-15490</p>
+ </item>
+ <item>
+ <p>
+ Fix <c>erl_epmd:port_please</c> spec to include
+ <c>atom()</c> and <c>string()</c>.</p>
+ <p>
+ Own Id: OTP-15557 Aux Id: PR-2117 </p>
+ </item>
+ <item>
+ <p>
+ The Logger handler logger_std_h now keeps track of the
+ inode of its log file in order to re-open the file if the
+ inode changes. This may happen, for instance, if the log
+ file is opened and saved by an editor.</p>
+ <p>
+ Own Id: OTP-15578 Aux Id: ERL-850 </p>
+ </item>
+ <item>
+ <p>
+ When user specific file modes are given to the logger
+ handler <c>logger_std_h</c>, they were earlier accepted
+ without any control. This is now changes, so Logger will
+ adjust the file modes as follows:</p>
+ <p>
+ - If <c>raw</c> is not found in the list, it is
+ added.<br/> - If none of <c>write</c>, <c>append</c> or
+ <c>exclusive</c> are found in the list, <c>append</c> is
+ added.<br/> - If none of <c>delayed_write</c> or
+ <c>{delayed_write,Size,Delay}</c> are found in the list,
+ <c>delayed_write</c> is added.</p>
+ <p>
+ Own Id: OTP-15602</p>
+ </item>
+ </list>
+ </section>
+
+
+ <section><title>Improvements and New Features</title>
+ <list>
+ <item>
+ <p>
+ The standard logger handler, <c>logger_std_h</c>, now has
+ a new internal feature for log rotation. The rotation
+ scheme is as follows:</p>
+ <p>
+ The log file to which the handler currently writes always
+ has the same name, i.e. the name which is configured for
+ the handler. The archived files have the same name, but
+ with extension ".N", where N is an integer. The newest
+ archive has extension ".0", and the oldest archive has
+ the highest number. </p>
+ <p>
+ The size at which the log file is rotated, and the number
+ of archive files that are kept, is specified with the
+ handler specific configuration parameters
+ <c>max_no_bytes</c> and <c>max_no_files</c> respectively. </p>
+ <p>
+ Archives can be compressed, in which case they get a
+ ".gz" file extension after the integer. Compression is
+ specified with the handler specific configuration
+ parameter <c>compress_on_rotate</c>.</p>
+ <p>
+ Own Id: OTP-15479</p>
+ </item>
+ <item>
+ <p>
+ The new functions <c>logger:i/0</c> and <c>logger:i/1</c>
+ are added. These provide the same information as
+ <c>logger:get_config/0</c> and other
+ <c>logger:get_*_config</c> functions, but the information
+ is more logically sorted and more readable.</p>
+ <p>
+ Own Id: OTP-15600</p>
+ </item>
+ <item>
+ <p>
+ Logger is now protected against overload due to massive
+ amounts of log events from the emulator or from remote
+ nodes.</p>
+ <p>
+ Own Id: OTP-15601</p>
+ </item>
+ <item>
+ <p>
+ Logger now uses os:system_time/1 instead of
+ erlang:system_time/1 to generate log event timestamps.</p>
+ <p>
+ Own Id: OTP-15625</p>
+ </item>
+ <item>
+ <p>
+ Add functions <c>application:set_env/1,2</c> and
+ <c>application:set_env/2</c>. These take a list of
+ application configuration parameters, and the behaviour
+ is equivalent to calling <c>application:set_env/4</c>
+ individually for each application/key combination, except
+ it is more efficient.</p>
+ <p>
+ <c>set_env/1,2</c> warns about duplicated applications or
+ keys. The warning is also emitted during boot, if
+ applications or keys are duplicated within one
+ configuration file, e.g. sys.config.</p>
+ <p>
+ Own Id: OTP-15642 Aux Id: PR-2164 </p>
+ </item>
+ <item>
+ <p>
+ Handler specific configuration parameters for the
+ standard handler <c>logger_std_h</c> are changed to be
+ more intuitive and more similar to the disk_log handler.</p>
+ <p>
+ Earlier there was only one parameter, <c>type</c>, which
+ could have the values <c>standard_io</c>,
+ <c>standard_error</c>, <c>{file,FileName}</c> or
+ <c>{file,FileName,Modes}</c>.</p>
+ <p>
+ This is now changed, so the following parameters are
+ allowed:</p>
+ <p>
+ <c>type = standard_io | standard_error | file</c><br/>
+ <c>file = file:filename()</c><br/> <c>modes =
+ [file:mode()]</c></p>
+ <p>
+ All parameters are optional. <c>type</c> defaults to
+ <c>standard_io</c>, unless a file name is given, in which
+ case it defaults to <c>file</c>. If <c>type</c> is set to
+ <c>file</c>, the file name defaults to the same as the
+ handler id.</p>
+ <p>
+ The potential incompatibility is that
+ <c>logger:get_config/0</c> and
+ <c>logger:get_handler_config/1</c> now returns the new
+ parameters, even if the configuration was set with the
+ old variant, e.g. <c>#{type=>{file,FileName}}</c>.</p>
+ <p>
+ *** POTENTIAL INCOMPATIBILITY ***</p>
+ <p>
+ Own Id: OTP-15662</p>
+ </item>
+ <item>
+ <p>
+ The new configuration parameter <c>file_check</c> is
+ added to the Logger handler <c>logger_std_h</c>. This
+ parameter specifies how long (in milliseconds) the
+ handler may wait before checking if the log file still
+ exists and the inode is the same as when it was opened.</p>
+ <p>
+ The default value is 0, which means that this check is
+ done prior to each write operation. Setting a higher
+ number may improve performance, but adds the risk of
+ loosing log events.</p>
+ <p>
+ Own Id: OTP-15663</p>
+ </item>
+ </list>
+ </section>
+
+</section>
+
<section><title>Kernel 6.2.1</title>
<section><title>Fixed Bugs and Malfunctions</title>