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authorSiri Hansen <[email protected]>2018-04-24 14:55:29 +0200
committerSiri Hansen <[email protected]>2018-04-26 14:37:31 +0200
commit05e1548e5b452d4bfe3bc6837a1a1b51a6367f72 (patch)
tree83a136fcf3c3a3830ee1fe426d049217ad85c757 /lib/kernel/doc/src
parent0deea4a8f369013ec00e231d0c2c37e4ab3f0ba1 (diff)
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Remove error_logger process and add logger process
Diffstat (limited to 'lib/kernel/doc/src')
-rw-r--r--lib/kernel/doc/src/error_logger.xml19
-rw-r--r--lib/kernel/doc/src/kernel_app.xml154
2 files changed, 147 insertions, 26 deletions
diff --git a/lib/kernel/doc/src/error_logger.xml b/lib/kernel/doc/src/error_logger.xml
index 91bf57cb91..cb6165c73e 100644
--- a/lib/kernel/doc/src/error_logger.xml
+++ b/lib/kernel/doc/src/error_logger.xml
@@ -31,6 +31,16 @@
<module>error_logger</module>
<modulesummary>Erlang error logger.</modulesummary>
<description>
+
+ <note>
+ <p>In OTP-21, a new API for logging was added to Erlang/OTP. The
+ old <c>error_logger</c> module can still be used by legacy
+ code, but new code should use the new API instead.</p>
+ <p>See <seealso marker="logger"><c>logger(3)</c></seealso> and
+ the <seealso marker="logger_chapter">Logging</seealso> chapter
+ in the user's guide for more information.</p>
+ </note>
+
<p>The Erlang <em>error logger</em> is an event manager (see
<seealso marker="doc/design_principles:des_princ">OTP Design Principles</seealso> and
<seealso marker="stdlib:gen_event"><c>gen_event(3)</c></seealso>),
@@ -171,14 +181,17 @@ ok</pre>
<func>
<name name="get_format_depth" arity="0"/>
<fsummary>Get the value of the Kernel application variable
- <c>error_logger_format_depth</c>.</fsummary>
+ <c>logger_format_depth</c>.</fsummary>
<desc>
<p>Returns <c>max(10, Depth)</c>, where <c>Depth</c> is the
value of
- <seealso marker="kernel:kernel_app#error_logger_format_depth">
- error_logger_format_depth</seealso>
+ <seealso marker="kernel_app#logger_format_depth">
+ logger_format_depth</seealso>
in the Kernel application, if Depth is an integer. Otherwise,
<c>unlimited</c> is returned.</p>
+ <p>For backwards compatibility, the value
+ of <c>error_logger_format_depth</c> is used
+ if <c>logger_format_depth</c> is not set.</p>
</desc>
</func>
<func>
diff --git a/lib/kernel/doc/src/kernel_app.xml b/lib/kernel/doc/src/kernel_app.xml
index 0762cebc94..554d675383 100644
--- a/lib/kernel/doc/src/kernel_app.xml
+++ b/lib/kernel/doc/src/kernel_app.xml
@@ -51,10 +51,13 @@
</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 <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>.</p>
</section>
<section>
@@ -113,6 +116,7 @@
</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,
@@ -176,34 +180,105 @@
<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>
+ <tag><c>logger_dest = 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>
+ <item><p>Installs the standard handler, <seealso marker="logger_std_h">
+ <c>logger_std_h(3)</c></seealso>, with <c>type</c> set
+ to <c>standard_io</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>
+ <item><p>Installs the standard handler, <seealso marker="logger_std_h">
+ <c>logger_std_h(3)</c></seealso>, with <c>type</c> set
+ to <c>{file, FileName}</c>, where <c>FileName</c>
is a string. The file is opened with encoding UTF-8.</p></item>
+ <tag><c>{disk_log, FileName}</c></tag>
+ <item><p>Installs the disk_log handler, <seealso marker="logger_disk_log_h">
+ <c>logger_disk_log_h(3)</c></seealso>, with <c>file</c> set
+ to <c>FileName</c> (a string), and possibly other disk_log
+ parameters set by the environment variables
+ <c>logger_disk_log_type</c>, <c>logger_disk_log_maxfiles</c> and
+ <c>logger_disk_log_maxbytes</c>,
+ see <seealso marker="#disk_log_vars">below</seealso>. 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
+ <p>No standard handler is installed, but
+ the initial, primitive 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>
+ <p>No standard handler is started, and the initial,
+ primitive handler is removed.</p>
</item>
</taglist>
</item>
- <tag><c>error_logger_format_depth = Depth</c></tag>
+ <tag><c>logger_level = Level</c></tag>
+ <item>
+ <p><c>Value = emergency | alert | critical | error | warning |
+ notice | info | debug</c></p>
+ <p>This parameter specifies which log levels to log. The
+ specified level, and all levels that are more severe, will
+ be logged.</p>
+ <p>This configuration parameter is used both for the global
+ logger level, and for the standard handler started by
+ the Kernel application (see <c>logger_dest</c> variable above).</p>
+ <p>The default value is <c>info</c></p>
+ </item>
+ <tag><marker id="disk_log_vars"/>
+ <c>logger_disk_log_type = halt | wrap</c></tag>
+ <item/>
+ <tag><c>logger_disk_log_maxfiles = integer()</c></tag>
+ <item/>
+ <tag><c>logger_disk_log_maxbytes = integer()</c></tag>
+ <item>
+ <p>If <c>logger_dest</c> is set to {disk_log,File}, then these
+ parameters specify the configuration to use when opening the
+ disk log file. They specify the type of disk log, the
+ maximum number of files (if the type is wrap) and the
+ maximum size of each file, respectively.</p>
+ <p>The default values are:</p>
+ <code>
+logger_disk_log_type = wrap
+logger_disk_log_maxfiles = 10
+logger_disk_log_maxbytes = 1048576</code>
+ </item>
+ <tag><marker id="logger_sasl_compatible"/>
+ <c>logger_sasl_compatible = boolean()</c></tag>
+ <item>
+ <p>If this parameter is set to true, then the logger handler
+ started by kernel will not log any progress-, crash-, or
+ supervisor reports. If the SASL application is starated,
+ these log events will be sent to a second handler instance
+ named sasl_h, according to values of the SASL environment
+ variables <c>sasl_error_logger</c>
+ and <c>sasl_errlog_type</c>, see
+ <seealso marker="sasl:sasl_app#configuration">SASL(6)
+ </seealso></p>
+ <p>The default value is <c>false</c></p>
+ <p>See chapter <seealso marker="logger_chapter#compatibility">Backwards
+ compatibility with error_logger</seealso> for more
+ information about handling of the so called SASL reports.</p>
+ </item>
+ <tag><marker id="logger_log_progress"/>
+ <c>logger_log_progress = boolean()</c></tag>
+ <item>
+ <p>If <c>logger_sasl_compatible = false</c>,
+ then <c>logger_log_progress</c> specifies if progress
+ reports from <c>supervisor</c>
+ and <c>application_controller</c> shall be logged or
+ not.</p>
+ <p>If <c>logger_sasl_compatible = false</c>,
+ then <c>logger_log_progress</c> is ignored.</p>
+ </item>
+ <tag><marker id="logger_format_depth"/>
+ <c>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>
+ formatted output from the logger handlers.</p>
<note><p>This configuration parameter was introduced in OTP 18.1
and is experimental. Based on user feedback, it
@@ -214,16 +289,16 @@
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
+ depth to which terms are printed by the logger
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>
+ configuration parameter is used by the default formatter,
+ <seealso marker="logger_formatter"><c>logger_formatter(3)</c></seealso>,
+ unless the formatter's <c>depth</c> parameter is explicitly set.
+ (If you have implemented your own formatter, this configuration
+ parameter has no effect on that.)</p>
<p><c>Depth</c> is used as follows: Format strings
- passed to the event handlers are rewritten.
+ received by the formatter 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
@@ -234,7 +309,20 @@
<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>
+ </item>
+ <tag><c>logger_max_size = integer() | unlimited</c></tag>
+ <item>
+ <p>This parameter specifies the maximum size (bytes) each
+ log event can have when printed by the standard logger
+ handler. If the resulting string after formatting an event
+ is bigger than this, it will be truncated before printed
+ to the handler's destination.</p>
+ </item>
+ <tag><c>logger_utc = boolean()</c></tag>
+ <item>
+ <p>If set to <c>true</c>, the default formatter will display
+ all dates in Universal Coordinated Time.</p>
+ </item>
<tag><c>global_groups = [GroupTuple]</c></tag>
<item>
<marker id="global_groups"></marker>
@@ -497,6 +585,26 @@ MaxT = TickTime + TickTime / 4</code>
</section>
<section>
+ <title>Deprecated Configuration Parameters</title>
+ <p>In OTP-21, a new API for logging was added to Erlang/OTP. The
+ old <c>error_logger</c> event manager, and event handlers
+ running on this manager, will still work, but they are not used
+ by default.</p>
+ <p>The following application environment variables can still be
+ set, but they will only be used if the corresponding new logger
+ variables are not set.</p>
+ <taglist>
+ <tag><c>error_logger</c></tag>
+ <item>Replaced by <c>logger_dest</c></item>
+ <tag><c>error_logger_format_depth</c></tag>
+ <item>Replaced by <c>logger_format_depth</c></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>,