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Diffstat (limited to 'lib/kernel/doc/src/logger_std_h.xml')
| -rw-r--r-- | lib/kernel/doc/src/logger_std_h.xml | 71 |
1 files changed, 36 insertions, 35 deletions
diff --git a/lib/kernel/doc/src/logger_std_h.xml b/lib/kernel/doc/src/logger_std_h.xml index 89e11389c5..08667ae7f9 100644 --- a/lib/kernel/doc/src/logger_std_h.xml +++ b/lib/kernel/doc/src/logger_std_h.xml @@ -38,62 +38,63 @@ <description> <p>This is the default handler for Logger. Multiple instances of this handler can be added to - Logger, and each instance will print logs to <c>standard_io</c>, + Logger, and each instance prints logs to <c>standard_io</c>, <c>standard_error</c> or to file. The default instance that starts - with Kernel is named <c>default</c> - which is the name to be used + with Kernel is named <c>default</c>, which is the name to be used for reconfiguration.</p> - <p>The handler has an overload protection mechanism that will keep the handler - process and the Kernel application alive during a high load of log - requests. How this feature works, and how to modify the configuration, - is described in the + <p>The handler has an overload protection mechanism that keeps the handler + process and the Kernel application alive during high loads of log + events. How overload protection works, and how to configure it, is + described in the <seealso marker="logger_chapter#overload_protection"><c>User's Guide</c> </seealso>.</p> <p>To add a new instance of the standard handler, use <seealso marker="logger#add_handler-3"><c>logger:add_handler/3</c> - </seealso>. The handler configuration argument is a map which may contain - general configuration parameters, as documented in the + </seealso>. The handler configuration argument is a map which can contain + general configuration parameters, as documented in the <seealso marker="logger_chapter#handler_configuration"><c>User's Guide</c> - </seealso>, as well as handler specific parameters. The specific parameters - are stored in a sub map with the key <c>config</c>. The following - keys and values may be specified:</p> + </seealso>, and handler specific parameters. The specific data + is stored in a sub map with the key <c>config</c>, and can contain the + following parameters:</p> <taglist> <tag><marker id="type"/><c>type</c></tag> <item> - <p>This will have the value <c>standard_io</c>, <c>standard_error</c>, - <c>{file,LogFileName}</c>, or <c>{file,LogFileName,LogFileOpts}</c>, - where <c>standard_io</c> is the default value for type. It's recommended - to not specify <c>LogFileOpts</c> if not absolutely necessary. The - default options used by the handler to open a file for logging are: - <c>raw</c>, <c>append</c> and <c>delayed_write</c>. The standard + <p>This has the value <c>standard_io</c>, <c>standard_error</c>, + <c>{file,LogFileName}</c>, or <c>{file,LogFileName,LogFileOpts}</c>.</p> + <p> Defaults to <c>standard_io</c>.</p> + <p>It is recommended to not specify <c>LogFileOpts</c>, unless absolutely + necessary. The default options used by the handler to open a file for logging are: + <c>raw</c>, <c>append</c> and <c>delayed_write</c>. Note that the standard handler does not have support for circular logging. Use the <seealso marker="logger_disk_log_h"><c>logger_disk_log_h</c> - </seealso> handler for this.</p></item> + </seealso> handler for this.</p> + </item> <tag><c>filesync_repeat_interval</c></tag> <item> - <p>This value (in milliseconds) specifies how often the handler will - do a file sync operation in order to make sure that buffered data gets - written to disk. The handler will repeatedly attempt this - operation, but only perform it if something has actually been logged - since the last sync. The default value is <c>5000</c> milliseconds. - If <c>no_repeat</c> is set as value, the repeated file sync operation + <p>This value, in milliseconds, specifies how often the handler does + a file sync operation to write buffered data to disk. The handler attempts + the operation repeatedly, but only performs a new sync if something has + actually been logged.</p> + <p>Defaults to <c>5000</c> milliseconds.</p> + <p>If <c>no_repeat</c> is set as value, the repeated file sync operation is disabled, and it will be the operating system settings that determine how quickly or slowly data gets written to disk. The user can also call - the <seealso marker="logger_std_h#sync-1"><c>sync/1</c></seealso> - function to perform a file sync.</p></item> + the <seealso marker="logger_std_h#filesync-1"><c>filesync/1</c></seealso> + function to perform a file sync.</p> + </item> </taglist> - <p>There are a number of other configuration parameters available, that are - to be used for customizing the overload protection behaviour. The same - parameters are used both in the standard handler and the disk_log handler, - and are documented in the + <p>Other configuration parameters exist, to be used for customizing + the overload protection behaviour. The same parameters are used both in the + standard handler and the disk_log handler, and are documented in the <seealso marker="logger_chapter#overload_protection"><c>User's Guide</c> </seealso>.</p> - <p>Note that when changing the configuration of the handler in runtime, by + <p>Note that if changing the configuration of the handler in runtime, by calling <seealso marker="logger#set_handler_config-2"><c>logger:set_handler_config/2</c> </seealso>, or <seealso marker="logger#set_handler_config-3"><c>logger:set_handler_config/3</c> </seealso>, - the <c>type</c> parameter may not be modified.</p> + the <c>type</c> parameter must not be modified.</p> <p>Example of adding a standard handler:</p> <code type="none"> logger:add_handler(my_standard_h, logger_std_h, @@ -103,9 +104,9 @@ logger:add_handler(my_standard_h, logger_std_h, #{type => {file,"./system_info.log"}, filesync_repeat_interval => 1000}}). </code> - <p>In order to configure the default handler (that starts initially with + <p>To set the default handler (that starts initially with the Kernel application) to log to file instead of <c>standard_io</c>, - change the Kernel default logger to use a file. Example:</p> + change the Kernel default logger configuration. Example:</p> <code type="none"> erl -kernel logger '[{handler,default,logger_std_h, #{config => #{type => {file,"./log.log"}}}}]' @@ -118,7 +119,7 @@ erl -kernel logger '[{handler,default,logger_std_h, <funcs> <func> - <name name="sync" arity="1" clause_i="1"/> + <name name="filesync" arity="1" clause_i="1"/> <fsummary>Writes buffered data to disk.</fsummary> <desc> <p>Write buffered data to disk.</p> |