diff options
Diffstat (limited to 'lib/kernel/doc/src/kernel_app.xml')
-rw-r--r-- | lib/kernel/doc/src/kernel_app.xml | 191 |
1 files changed, 109 insertions, 82 deletions
diff --git a/lib/kernel/doc/src/kernel_app.xml b/lib/kernel/doc/src/kernel_app.xml index 0762cebc94..3914226a3e 100644 --- a/lib/kernel/doc/src/kernel_app.xml +++ b/lib/kernel/doc/src/kernel_app.xml @@ -42,7 +42,6 @@ <item>Start, stop, supervision, configuration, and distribution of applications</item> <item>Code loading</item> <item>Logging</item> - <item>Error logging</item> <item>Global name service</item> <item>Supervision of Erlang/OTP</item> <item>Communication with sockets</item> @@ -51,10 +50,13 @@ </description> <section> - <title>Error Logger Event Handlers</title> - <p>Two standard error logger event handlers are defined in - the Kernel application. These are described in - <seealso marker="error_logger"><c>error_logger(3)</c></seealso>.</p> + <title>Logger Handlers</title> + <p>Two standard logger handlers are defined in + the Kernel application. These are described in the + <seealso marker="logger_chapter">Kernel User's Guide</seealso>, + and in the <seealso marker="logger_std_h"><c>logger_std_h(3)</c></seealso> + and <seealso marker="logger_disk_log_h"><c>logger_disk_log_h(3)</c> + </seealso> manual pages.</p> </section> <section> @@ -113,26 +115,12 @@ </section> <section> + <marker id="configuration"/> <title>Configuration</title> <p>The following configuration parameters are defined for the Kernel application. For more information about configuration parameters, see file <seealso marker="app"><c>app(4)</c></seealso>.</p> <taglist> - <tag><c>browser_cmd = string() | {M,F,A}</c></tag> - <item> - <p>When pressing the <em>Help</em> button in a tool such as Debugger, - the help text (an HTML file <c>File</c>) is by default - displayed in a Netscape browser, which is required to be - operational. This parameter can be used to change the command for - how to display the help text if another browser than Netscape - is preferred, or if another platform than Unix or Windows is - used.</p> - <p>If set to a string <c>Command</c>, the command - <c>"Command File"</c> is evaluated using - <seealso marker="os#cmd/1"><c>os:cmd/1</c></seealso>.</p> - <p>If set to a module-function-args tuple, <c>{M,F,A}</c>, - the call <c>apply(M,F,[File|A])</c> is evaluated.</p> - </item> <tag><c>distributed = [Distrib]</c></tag> <item> <p>Specifies which applications that are distributed and on which @@ -176,65 +164,74 @@ <p>Permissions are described in <seealso marker="application#permit/2"><c>application:permit/2</c></seealso>.</p> </item> - <tag><c>error_logger = Value</c></tag> - <item> - <p><c>Value</c> is one of:</p> - <taglist> - <tag><c>tty</c></tag> - <item><p>Installs the standard event handler, which prints error - reports to <c>stdio</c>. This is the default option.</p></item> - <tag><c>{file, FileName}</c></tag> - <item><p>Installs the standard event handler, which prints error - reports to file <c>FileName</c>, where <c>FileName</c> - is a string. The file is opened with encoding UTF-8.</p></item> - <tag><c>false</c></tag> - <item> - <p>No standard event handler is installed, but - the initial, primitive event handler is kept, printing - raw event messages to <c>tty</c>.</p> - </item> - <tag><c>silent</c></tag> - <item> - <p>Error logging is turned off.</p> - </item> - </taglist> + <tag><marker id="logger"/><c>logger = [Config]</c></tag> + <item> + <p>Specifies the configuration + for <seealso marker="logger">Logger</seealso>, except the + primary log level, which is specified + with <seealso marker="#logger_level"><c>logger_level</c></seealso>, + and the compatibility + with <seealso marker="sasl:error_logging">SASL Error + Logging</seealso>, which is specified + with <seealso marker="#logger_sasl_compatible"> + <c>logger_sasl_compatible</c></seealso>.</p> + <p>The <c>logger </c> parameter is described in + section <seealso marker="logger_chapter#logger_parameter"> + Logging</seealso> in the Kernel User's Guide.</p> + </item> + <tag><marker id="logger_level"/><c>logger_level = Level</c></tag> + <item> + <p>Specifies the primary log level for Logger. Log events with + the same, or a more severe level, pass through the primary + log level check. See + section <seealso marker="logger_chapter">Logging</seealso> + in the Kernel User's Guide for more information about Logger + and log levels.</p> + <p><c>Level = emergency | alert | critical | error | warning | + notice | info | debug | all | none</c></p> + <p>To change the primary log level at runtime, use + <seealso marker="logger#set_primary_config/2"> + <c>logger:set_primary_config(level, Level)</c></seealso>.</p> + <p>Defaults to <c>info</c>.</p> + </item> + <tag><marker id="logger_sasl_compatible"/> + <c>logger_sasl_compatible = true | false</c></tag> + <item> + <p>Specifies if Logger behaves backwards compatible with the + SASL error logging functionality from releases prior to + Erlang/OTP 21.0.</p> + <p>If this parameter is set to <c>true</c>, the default Logger + handler does not log any progress-, crash-, or supervisor + reports. If the SASL application is then started, it adds a + Logger handler named <c>sasl</c>, which logs these events + according to values of the SASL configuration + parameter <c>sasl_error_logger</c> + and <c>sasl_errlog_type</c>.</p> + <p>See section + <seealso marker="sasl:sasl_app#deprecated_error_logger_config"> + Deprecated Error Logger Event Handlers and + Configuration</seealso> in the sasl(6) manual page for + information about the SASL configuration parameters.</p> + <p>See section <seealso marker="sasl:error_logging">SASL Error + Logging</seealso> in the SASL User's Guide, and + section <seealso marker="logger_chapter#compatibility">Backwards + Compatibility with error_logger</seealso> in the Kernel + User's Guide for information about the SASL error logging + functionality, and how Logger can be backwards compatible + with this.</p> + <p>Defaults to <c>false</c>.</p> + <note> + <p>If this parameter is set to <c>true</c>, + <c>sasl_errlog_type</c> indicates that progress reports + shall be logged, and the configured primary log level + is <c>notice</c> or more severe, then SASL automatically + sets the primary log level to <c>info</c>. That is, this + setting can potentially overwrite the value of the Kernel + configuration parameter <c>logger_level</c>. This is to + allow progress reports, which have log level <c>info</c>, + to be forwarded to the handlers.</p> + </note> </item> - <tag><c>error_logger_format_depth = Depth</c></tag> - <item> - <marker id="error_logger_format_depth"></marker> - <p>Can be used to limit the size of the - formatted output from the error logger event handlers.</p> - - <note><p>This configuration parameter was introduced in OTP 18.1 - and is experimental. Based on user feedback, it - can be changed or improved in future releases, for example, - to gain better control over how to limit the size of the - formatted output. We have no plans to remove this - new feature entirely, unless it turns out to be - useless.</p></note> - - <p><c>Depth</c> is a positive integer representing the maximum - depth to which terms are printed by the error logger event - handlers included in OTP. This - configuration parameter is used by the two event handlers - defined by the Kernel application and the two event - handlers in the SASL application. - (If you have implemented your own error handlers, this configuration - parameter has no effect on them.)</p> - - <p><c>Depth</c> is used as follows: Format strings - passed to the event handlers are rewritten. - The format controls <c>~p</c> and <c>~w</c> are replaced with - <c>~P</c> and <c>~W</c>, respectively, and <c>Depth</c> is - used as the depth parameter. For details, see - <seealso marker="stdlib:io#format/2"><c>io:format/2</c></seealso> - in STDLIB.</p> - - <note><p>A reasonable starting value for <c>Depth</c> is - <c>30</c>. We recommend to test crashing various processes in your - application, examine the logs from the crashes, and then - increase or decrease the value.</p></note> - </item> <tag><c>global_groups = [GroupTuple]</c></tag> <item> <marker id="global_groups"></marker> @@ -286,9 +283,8 @@ </item> <tag><c>inet_parse_error_log = silent</c></tag> <item> - <p>If set, no - <c>error_logger</c> messages are generated when erroneous - lines are found and skipped in the various Inet configuration + <p>If set, no log events are issued when erroneous lines are + found and skipped in the various Inet configuration files.</p> </item> <tag><c>inetrc = Filename</c></tag> @@ -497,6 +493,37 @@ MaxT = TickTime + TickTime / 4</code> </section> <section> + <title>Deprecated Configuration Parameters</title> + <p>In Erlang/OTP 21.0, a new API for logging was added. The + old <c>error_logger</c> event manager, and event handlers + running on this manager, still work, but they are no longer used + by default.</p> + <p>The following application configuration parameters can still be + set, but they are only used if the corresponding configuration + parameters for Logger are not set.</p> + <taglist> + <tag><c>error_logger</c></tag> + <item>Replaced by setting the type of the default + <seealso marker="logger_std_h#type"><c>logger_std_h</c></seealso> + to the same value. Example: + <code type="none"> +erl -kernel logger '[{handler,default,logger_std_h,#{config=>#{type=>{file,"/tmp/erlang.log"}}}}]' + </code> + </item> + <tag><c>error_logger_format_depth</c></tag> + <item>Replaced by setting the <seealso marker="logger_formatter#depth"><c>depth</c></seealso> + parameter of the default handlers formatter. Example: + <code type="none"> +erl -kernel logger '[{handler,default,logger_std_h,#{formatter=>{logger_formatter,#{legacy_header=>true,template=>[{logger_formatter,header},"\n",msg,"\n"],depth=>10}}}]' + </code> + </item> + </taglist> + <p>See <seealso marker="logger_chapter#compatibility">Backwards + compatibility with error_logger</seealso> for more + information.</p> + </section> + + <section> <title>See Also</title> <p><seealso marker="app"><c>app(4)</c></seealso>, <seealso marker="application"><c>application(3)</c></seealso>, @@ -504,12 +531,12 @@ MaxT = TickTime + TickTime / 4</code> <seealso marker="disk_log"><c>disk_log(3)</c></seealso>, <seealso marker="erl_boot_server"><c>erl_boot_server(3)</c></seealso>, <seealso marker="erl_ddll"><c>erl_ddll(3)</c></seealso>, - <seealso marker="error_logger"><c>error_logger(3)</c></seealso>, <seealso marker="file"><c>file(3)</c></seealso>, <seealso marker="global"><c>global(3)</c></seealso>, <seealso marker="global_group"><c>global_group(3)</c></seealso>, <seealso marker="heart"><c>heart(3)</c></seealso>, <seealso marker="inet"><c>inet(3)</c></seealso>, + <seealso marker="logger"><c>logger(3)</c></seealso>, <seealso marker="net_kernel"><c>net_kernel(3)</c></seealso>, <seealso marker="os"><c>os(3)</c></seealso>, <seealso marker="pg2"><c>pg2(3)</c></seealso>, |