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<img alt="Erlang logo" src="../../../../doc/erlang-logo.png"><br><small><a href="index.html">Reference Manual</a><br><a href="release_notes.html">Release Notes</a><br><a href="../pdf/kernel-2.15.3.pdf">PDF</a><br><a href="../../../../doc/index.html">Top</a></small><p><strong>Kernel</strong><br><strong>Reference Manual</strong><br><small>Version 2.15.3</small></p>
<br><a href="javascript:openAllFlips()">Expand All</a><br><a href="javascript:closeAllFlips()">Contract All</a><p><small><strong>Table of Contents</strong></small></p>
<ul class="flipMenu">
<li title="kernel (App)"><a href="kernel_app.html">kernel (App)
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<li id="no" title="application " expanded="false">application<ul>
<li><a href="application.html">
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<li title="get_all_env-0"><a href="application.html#get_all_env-0">get_all_env/0</a></li>
<li title="get_all_env-1"><a href="application.html#get_all_env-1">get_all_env/1</a></li>
<li title="get_all_key-0"><a href="application.html#get_all_key-0">get_all_key/0</a></li>
<li title="get_all_key-1"><a href="application.html#get_all_key-1">get_all_key/1</a></li>
<li title="get_application-0"><a href="application.html#get_application-0">get_application/0</a></li>
<li title="get_application-1"><a href="application.html#get_application-1">get_application/1</a></li>
<li title="get_env-1"><a href="application.html#get_env-1">get_env/1</a></li>
<li title="get_env-2"><a href="application.html#get_env-2">get_env/2</a></li>
<li title="get_key-1"><a href="application.html#get_key-1">get_key/1</a></li>
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<li title="load-1"><a href="application.html#load-1">load/1</a></li>
<li title="load-2"><a href="application.html#load-2">load/2</a></li>
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<li title="set_env-3"><a href="application.html#set_env-3">set_env/3</a></li>
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<li title="which_applications-0"><a href="application.html#which_applications-0">which_applications/0</a></li>
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<li title="Module:start-2"><a href="application.html#Module:start-2">Module:start/2</a></li>
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<li title="set_path-1"><a href="code.html#set_path-1">set_path/1</a></li>
<li title="get_path-0"><a href="code.html#get_path-0">get_path/0</a></li>
<li title="add_path-1"><a href="code.html#add_path-1">add_path/1</a></li>
<li title="add_pathz-1"><a href="code.html#add_pathz-1">add_pathz/1</a></li>
<li title="add_patha-1"><a href="code.html#add_patha-1">add_patha/1</a></li>
<li title="add_paths-1"><a href="code.html#add_paths-1">add_paths/1</a></li>
<li title="add_pathsz-1"><a href="code.html#add_pathsz-1">add_pathsz/1</a></li>
<li title="add_pathsa-1"><a href="code.html#add_pathsa-1">add_pathsa/1</a></li>
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<li title="delete-1"><a href="code.html#delete-1">delete/1</a></li>
<li title="purge-1"><a href="code.html#purge-1">purge/1</a></li>
<li title="soft_purge-1"><a href="code.html#soft_purge-1">soft_purge/1</a></li>
<li title="is_loaded-1"><a href="code.html#is_loaded-1">is_loaded/1</a></li>
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<li title="which-1"><a href="code.html#which-1">which/1</a></li>
<li title="get_object_code-1"><a href="code.html#get_object_code-1">get_object_code/1</a></li>
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<li title="priv_dir-1"><a href="code.html#priv_dir-1">priv_dir/1</a></li>
<li title="objfile_extension-0"><a href="code.html#objfile_extension-0">objfile_extension/0</a></li>
<li title="stick_dir-1"><a href="code.html#stick_dir-1">stick_dir/1</a></li>
<li title="unstick_dir-1"><a href="code.html#unstick_dir-1">unstick_dir/1</a></li>
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<li title="clash-0"><a href="code.html#clash-0">clash/0</a></li>
<li title="is_module_native-1"><a href="code.html#is_module_native-1">is_module_native/1</a></li>
</ul>
</li>
<li id="no" title="disk_log " expanded="false">disk_log<ul>
<li><a href="disk_log.html">
Top of manual page
</a></li>
<li title="accessible_logs-0"><a href="disk_log.html#accessible_logs-0">accessible_logs/0</a></li>
<li title="alog-2"><a href="disk_log.html#alog-2">alog/2</a></li>
<li title="balog-2"><a href="disk_log.html#balog-2">balog/2</a></li>
<li title="alog_terms-2"><a href="disk_log.html#alog_terms-2">alog_terms/2</a></li>
<li title="balog_terms-2"><a href="disk_log.html#balog_terms-2">balog_terms/2</a></li>
<li title="block-1"><a href="disk_log.html#block-1">block/1</a></li>
<li title="block-2"><a href="disk_log.html#block-2">block/2</a></li>
<li title="change_header-2"><a href="disk_log.html#change_header-2">change_header/2</a></li>
<li title="change_notify-3"><a href="disk_log.html#change_notify-3">change_notify/3</a></li>
<li title="change_size-2"><a href="disk_log.html#change_size-2">change_size/2</a></li>
<li title="chunk-2"><a href="disk_log.html#chunk-2">chunk/2</a></li>
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<li title="chunk_info-1"><a href="disk_log.html#chunk_info-1">chunk_info/1</a></li>
<li title="chunk_step-3"><a href="disk_log.html#chunk_step-3">chunk_step/3</a></li>
<li title="close-1"><a href="disk_log.html#close-1">close/1</a></li>
<li title="format_error-1"><a href="disk_log.html#format_error-1">format_error/1</a></li>
<li title="inc_wrap_file-1"><a href="disk_log.html#inc_wrap_file-1">inc_wrap_file/1</a></li>
<li title="info-1"><a href="disk_log.html#info-1">info/1</a></li>
<li title="lclose-1"><a href="disk_log.html#lclose-1">lclose/1</a></li>
<li title="lclose-2"><a href="disk_log.html#lclose-2">lclose/2</a></li>
<li title="log-2"><a href="disk_log.html#log-2">log/2</a></li>
<li title="blog-2"><a href="disk_log.html#blog-2">blog/2</a></li>
<li title="log_terms-2"><a href="disk_log.html#log_terms-2">log_terms/2</a></li>
<li title="blog_terms-2"><a href="disk_log.html#blog_terms-2">blog_terms/2</a></li>
<li title="open-1"><a href="disk_log.html#open-1">open/1</a></li>
<li title="pid2name-1"><a href="disk_log.html#pid2name-1">pid2name/1</a></li>
<li title="reopen-2"><a href="disk_log.html#reopen-2">reopen/2</a></li>
<li title="reopen-3"><a href="disk_log.html#reopen-3">reopen/3</a></li>
<li title="breopen-3"><a href="disk_log.html#breopen-3">breopen/3</a></li>
<li title="sync-1"><a href="disk_log.html#sync-1">sync/1</a></li>
<li title="truncate-1"><a href="disk_log.html#truncate-1">truncate/1</a></li>
<li title="truncate-2"><a href="disk_log.html#truncate-2">truncate/2</a></li>
<li title="btruncate-2"><a href="disk_log.html#btruncate-2">btruncate/2</a></li>
<li title="unblock-1"><a href="disk_log.html#unblock-1">unblock/1</a></li>
</ul>
</li>
<li id="no" title="erl_boot_server " expanded="false">erl_boot_server<ul>
<li><a href="erl_boot_server.html">
Top of manual page
</a></li>
<li title="start-1"><a href="erl_boot_server.html#start-1">start/1</a></li>
<li title="start_link-1"><a href="erl_boot_server.html#start_link-1">start_link/1</a></li>
<li title="add_slave-1"><a href="erl_boot_server.html#add_slave-1">add_slave/1</a></li>
<li title="delete_slave-1"><a href="erl_boot_server.html#delete_slave-1">delete_slave/1</a></li>
<li title="which_slaves-0"><a href="erl_boot_server.html#which_slaves-0">which_slaves/0</a></li>
</ul>
</li>
<li id="no" title="erl_ddll " expanded="false">erl_ddll<ul>
<li><a href="erl_ddll.html">
Top of manual page
</a></li>
<li title="demonitor-1"><a href="erl_ddll.html#demonitor-1">demonitor/1</a></li>
<li title="info-0"><a href="erl_ddll.html#info-0">info/0</a></li>
<li title="info-1"><a href="erl_ddll.html#info-1">info/1</a></li>
<li title="info-2"><a href="erl_ddll.html#info-2">info/2</a></li>
<li title="load-2"><a href="erl_ddll.html#load-2">load/2</a></li>
<li title="load_driver-2"><a href="erl_ddll.html#load_driver-2">load_driver/2</a></li>
<li title="monitor-2"><a href="erl_ddll.html#monitor-2">monitor/2</a></li>
<li title="reload-2"><a href="erl_ddll.html#reload-2">reload/2</a></li>
<li title="reload_driver-2"><a href="erl_ddll.html#reload_driver-2">reload_driver/2</a></li>
<li title="try_load-3"><a href="erl_ddll.html#try_load-3">try_load/3</a></li>
<li title="try_unload-2"><a href="erl_ddll.html#try_unload-2">try_unload/2</a></li>
<li title="unload-1"><a href="erl_ddll.html#unload-1">unload/1</a></li>
<li title="unload_driver-1"><a href="erl_ddll.html#unload_driver-1">unload_driver/1</a></li>
<li title="loaded_drivers-0"><a href="erl_ddll.html#loaded_drivers-0">loaded_drivers/0</a></li>
<li title="format_error-1"><a href="erl_ddll.html#format_error-1">format_error/1</a></li>
</ul>
</li>
<li title="erl_prim_loader"><a href="erl_prim_loader.html">erl_prim_loader</a></li>
<li title="erlang"><a href="erlang.html">erlang</a></li>
<li id="no" title="error_handler " expanded="false">error_handler<ul>
<li><a href="error_handler.html">
Top of manual page
</a></li>
<li title="undefined_function-3"><a href="error_handler.html#undefined_function-3">undefined_function/3</a></li>
<li title="undefined_lambda-3"><a href="error_handler.html#undefined_lambda-3">undefined_lambda/3</a></li>
</ul>
</li>
<li id="loadscrollpos" title="error_logger " expanded="true">error_logger<ul>
<li><a href="error_logger.html">
Top of manual page
</a></li>
<li title="error_msg-1"><a href="error_logger.html#error_msg-1">error_msg/1</a></li>
<li title="error_msg-2"><a href="error_logger.html#error_msg-2">error_msg/2</a></li>
<li title="format-2"><a href="error_logger.html#format-2">format/2</a></li>
<li title="error_report-1"><a href="error_logger.html#error_report-1">error_report/1</a></li>
<li title="error_report-2"><a href="error_logger.html#error_report-2">error_report/2</a></li>
<li title="warning_map-0"><a href="error_logger.html#warning_map-0">warning_map/0</a></li>
<li title="warning_msg-1"><a href="error_logger.html#warning_msg-1">warning_msg/1</a></li>
<li title="warning_msg-2"><a href="error_logger.html#warning_msg-2">warning_msg/2</a></li>
<li title="warning_report-1"><a href="error_logger.html#warning_report-1">warning_report/1</a></li>
<li title="warning_report-2"><a href="error_logger.html#warning_report-2">warning_report/2</a></li>
<li title="info_msg-1"><a href="error_logger.html#info_msg-1">info_msg/1</a></li>
<li title="info_msg-2"><a href="error_logger.html#info_msg-2">info_msg/2</a></li>
<li title="info_report-1"><a href="error_logger.html#info_report-1">info_report/1</a></li>
<li title="info_report-2"><a href="error_logger.html#info_report-2">info_report/2</a></li>
<li title="add_report_handler-1"><a href="error_logger.html#add_report_handler-1">add_report_handler/1</a></li>
<li title="add_report_handler-2"><a href="error_logger.html#add_report_handler-2">add_report_handler/2</a></li>
<li title="delete_report_handler-1"><a href="error_logger.html#delete_report_handler-1">delete_report_handler/1</a></li>
<li title="tty-1"><a href="error_logger.html#tty-1">tty/1</a></li>
<li title="logfile-1"><a href="error_logger.html#logfile-1">logfile/1</a></li>
</ul>
</li>
<li id="no" title="file " expanded="false">file<ul>
<li><a href="file.html">
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<li title="advise-4"><a href="file.html#advise-4">advise/4</a></li>
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<li title="change_owner-3"><a href="file.html#change_owner-3">change_owner/3</a></li>
<li title="change_time-2"><a href="file.html#change_time-2">change_time/2</a></li>
<li title="change_time-3"><a href="file.html#change_time-3">change_time/3</a></li>
<li title="close-1"><a href="file.html#close-1">close/1</a></li>
<li title="consult-1"><a href="file.html#consult-1">consult/1</a></li>
<li title="copy-2"><a href="file.html#copy-2">copy/2</a></li>
<li title="copy-3"><a href="file.html#copy-3">copy/3</a></li>
<li title="del_dir-1"><a href="file.html#del_dir-1">del_dir/1</a></li>
<li title="delete-1"><a href="file.html#delete-1">delete/1</a></li>
<li title="eval-1"><a href="file.html#eval-1">eval/1</a></li>
<li title="eval-2"><a href="file.html#eval-2">eval/2</a></li>
<li title="file_info-1"><a href="file.html#file_info-1">file_info/1</a></li>
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<div id="content">
<div class="innertube">
<!-- refpage --><center><h1>error_logger</h1></center>
<h3>MODULE</h3>
<div class="REFBODY">error_logger</div>
<h3>MODULE SUMMARY</h3>
<div class="REFBODY">Erlang Error Logger</div>
<h3>DESCRIPTION</h3>
<div class="REFBODY"><p>
<p>The Erlang <strong>error logger</strong> is an event manager (see
<span class="bold_code"><a href="javascript:erlhref('../../../../doc/../','doc/design_principles','des_princ.html');">OTP Design Principles</a></span> and
<span class="bold_code"><a href="javascript:erlhref('../../../../doc/../','stdlib','gen_event.html');">gen_event(3)</a></span>),
registered as <span class="code">error_logger</span>. Error, warning and info events
are sent to the error logger from the Erlang runtime system and
the different Erlang/OTP applications. The events are, by default,
logged to tty. Note that an event from a process <span class="code">P</span> is
logged at the node of the group leader of <span class="code">P</span>. This means
that log output is directed to the node from which a process was
created, which not necessarily is the same node as where it is
executing.</p>
<p>Initially, <span class="code">error_logger</span> only has a primitive event
handler, which buffers and prints the raw event messages. During
system startup, the application Kernel replaces this with a
<strong>standard event handler</strong>, by default one which writes
nicely formatted output to tty. Kernel can also be configured so
that events are logged to file instead, or not logged at all, see
<span class="bold_code"><a href="kernel_app.html">kernel(6)</a></span>.</p>
<p>Also the SASL application, if started, adds its own event
handler, which by default writes supervisor, crash and progress
reports to tty. See
<span class="bold_code"><a href="javascript:erlhref('../../../../doc/../','sasl','sasl_app.html');">sasl(6)</a></span>.</p>
<p>It is recommended that user defined applications should report
errors through the error logger, in order to get uniform reports.
User defined event handlers can be added to handle application
specific events. (<span class="code">add_report_handler/1,2</span>). Also, there is
a useful event handler in STDLIB for multi-file logging of events,
see <span class="code">log_mf_h(3)</span>.</p>
<p>Warning events was introduced in Erlang/OTP R9C. To retain
backwards compatibility, these are by default tagged as errors,
thus showing up as error reports in the logs. By using
the command line flag <span class="code">+W <w | i></span>, they can instead
be tagged as warnings or info. Tagging them as warnings may
require rewriting existing user defined event handlers.</p>
</p></div>
<h3>DATA TYPES</h3>
<p>
<span class="bold_code"><a name="type-report">report()</a> = [{Tag :: term(), Data :: term()} | term()]<br> | string()<br> | term()</span><br></p>
<h3>EXPORTS</h3>
<p><a name="error_msg-1"></a><span class="bold_code">error_msg(Format) -> ok</span><br><a name="error_msg-2"></a><span class="bold_code">error_msg(Format, Data) -> ok</span><br><a name="format-2"></a><span class="bold_code">format(Format, Data) -> ok</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Format = string()</span></div>
<div class="REFTYPES"><span class="bold_code">Data = list()</span></div>
</div></p>
<div class="REFBODY"><p>
<p>Sends a standard error event to the error logger.
The <span class="code">Format</span> and <span class="code">Data</span> arguments are the same as
the arguments of <span class="code">io:format/2</span>. The event is handled by
the standard event handler.</p>
<div class="example"><pre>
1> <span class="bold_code">error_logger:error_msg("An error occurred in ~p~n", [a_module]).</span>
=ERROR REPORT==== 11-Aug-2005::14:03:19 ===
An error occurred in a_module
ok</pre></div>
<div class="warning">
<div class="label">Warning</div>
<div class="content"><p>
<p>If called with bad arguments, this function can crash
the standard event handler, meaning no further events are
logged. When in doubt, use <span class="code">error_report/1</span> instead.</p>
</p></div>
</div>
</p></div>
<p><a name="error_report-1"></a><span class="bold_code">error_report(Report) -> ok</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Report = <span class="bold_code"><a href="#type-report">report()</a></span></span></div>
</div></p>
<div class="REFBODY"><p>
<p>Sends a standard error report event to the error logger.
The event is handled by the standard event handler.</p>
<div class="example"><pre>
2> <span class="bold_code">error_logger:error_report([{tag1,data1},a_term,{tag2,data}]).</span>
=ERROR REPORT==== 11-Aug-2005::13:45:41 ===
tag1: data1
a_term
tag2: data
ok
3> <span class="bold_code">error_logger:error_report("Serious error in my module").</span>
=ERROR REPORT==== 11-Aug-2005::13:45:49 ===
Serious error in my module
ok</pre></div>
</p></div>
<p><a name="error_report-2"></a><span class="bold_code">error_report(Type, Report) -> ok</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Type = term()</span></div>
<div class="REFTYPES"><span class="bold_code">Report = <span class="bold_code"><a href="#type-report">report()</a></span></span></div>
</div></p>
<div class="REFBODY"><p>
<p>Sends a user defined error report event to the error logger.
An event handler to handle the event is supposed to have been
added. The event is ignored by the standard event handler.</p>
<p>It is recommended that <span class="code">Report</span> follows the same
structure as for <span class="code">error_report/1</span>.</p>
</p></div>
<p><a name="warning_map-0"><span class="bold_code">warning_map() -> Tag</span></a><br></p>
<div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES">
<span class="bold_code">Tag = error | warning | info</span><br>
</div>
</div>
<div class="REFBODY"><p>
<p>Returns the current mapping for warning events. Events sent
using <span class="code">warning_msg/1,2</span> or <span class="code">warning_report/1,2</span>
are tagged as errors (default), warnings or info, depending
on the value of the command line flag <span class="code">+W</span>.</p>
<div class="example"><pre>
os$ <span class="bold_code">erl</span>
Erlang (BEAM) emulator version 5.4.8 [hipe] [threads:0] [kernel-poll]
Eshell V5.4.8 (abort with ^G)
1> <span class="bold_code">error_logger:warning_map().</span>
error
2> <span class="bold_code">error_logger:warning_msg("Warnings tagged as: ~p~n", [error]).</span>
=ERROR REPORT==== 11-Aug-2005::15:31:23 ===
Warnings tagged as: error
ok
3>
User switch command
--> q
os$ <span class="bold_code">erl +W w</span>
Erlang (BEAM) emulator version 5.4.8 [hipe] [threads:0] [kernel-poll]
Eshell V5.4.8 (abort with ^G)
1> <span class="bold_code">error_logger:warning_map().</span>
warning
2> <span class="bold_code">error_logger:warning_msg("Warnings tagged as: ~p~n", [warning]).</span>
=WARNING REPORT==== 11-Aug-2005::15:31:55 ===
Warnings tagged as: warning
ok</pre></div>
</p></div>
<p><a name="warning_msg-1"></a><span class="bold_code">warning_msg(Format) -> ok</span><br><a name="warning_msg-2"></a><span class="bold_code">warning_msg(Format, Data) -> ok</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Format = string()</span></div>
<div class="REFTYPES"><span class="bold_code">Data = list()</span></div>
</div></p>
<div class="REFBODY"><p>
<p>Sends a standard warning event to the error logger.
The <span class="code">Format</span> and <span class="code">Data</span> arguments are the same as
the arguments of <span class="code">io:format/2</span>. The event is handled by
the standard event handler. It is tagged either as an error,
warning or info, see
<span class="bold_code"><a href="#warning_map-0">warning_map/0</a></span>.</p>
<div class="warning">
<div class="label">Warning</div>
<div class="content"><p>
<p>If called with bad arguments, this function can crash
the standard event handler, meaning no further events are
logged. When in doubt, use <span class="code">warning_report/1</span> instead.</p>
</p></div>
</div>
</p></div>
<p><a name="warning_report-1"></a><span class="bold_code">warning_report(Report) -> ok</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Report = <span class="bold_code"><a href="#type-report">report()</a></span></span></div>
</div></p>
<div class="REFBODY"><p>
<p>Sends a standard warning report event to the error logger.
The event is handled by the standard event handler. It is
tagged either as an error, warning or info, see
<span class="bold_code"><a href="#warning_map-0">warning_map/0</a></span>.</p>
</p></div>
<p><a name="warning_report-2"></a><span class="bold_code">warning_report(Type, Report) -> ok</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Type = any()</span></div>
<div class="REFTYPES"><span class="bold_code">Report = <span class="bold_code"><a href="#type-report">report()</a></span></span></div>
</div></p>
<div class="REFBODY"><p>
<p>Sends a user defined warning report event to the error
logger. An event handler to handle the event is supposed to
have been added. The event is ignored by the standard event
handler. It is tagged either as an error, warning or info,
depending on the value of
<span class="bold_code"><a href="#warning_map-0">warning_map/0</a></span>.</p>
</p></div>
<p><a name="info_msg-1"></a><span class="bold_code">info_msg(Format) -> ok</span><br><a name="info_msg-2"></a><span class="bold_code">info_msg(Format, Data) -> ok</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Format = string()</span></div>
<div class="REFTYPES"><span class="bold_code">Data = list()</span></div>
</div></p>
<div class="REFBODY"><p>
<p>Sends a standard information event to the error logger.
The <span class="code">Format</span> and <span class="code">Data</span> arguments are the same as
the arguments of <span class="code">io:format/2</span>. The event is handled by
the standard event handler.</p>
<div class="example"><pre>
1> <span class="bold_code">error_logger:info_msg("Something happened in ~p~n", [a_module]).</span>
=INFO REPORT==== 11-Aug-2005::14:06:15 ===
Something happened in a_module
ok</pre></div>
<div class="warning">
<div class="label">Warning</div>
<div class="content"><p>
<p>If called with bad arguments, this function can crash
the standard event handler, meaning no further events are
logged. When in doubt, use <span class="code">info_report/1</span> instead.</p>
</p></div>
</div>
</p></div>
<p><a name="info_report-1"></a><span class="bold_code">info_report(Report) -> ok</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Report = <span class="bold_code"><a href="#type-report">report()</a></span></span></div>
</div></p>
<div class="REFBODY"><p>
<p>Sends a standard information report event to the error
logger. The event is handled by the standard event handler.</p>
<div class="example"><pre>
2> <span class="bold_code">error_logger:info_report([{tag1,data1},a_term,{tag2,data}]).</span>
=INFO REPORT==== 11-Aug-2005::13:55:09 ===
tag1: data1
a_term
tag2: data
ok
3> <span class="bold_code">error_logger:info_report("Something strange happened").</span>
=INFO REPORT==== 11-Aug-2005::13:55:36 ===
Something strange happened
ok</pre></div>
</p></div>
<p><a name="info_report-2"></a><span class="bold_code">info_report(Type, Report) -> ok</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Type = any()</span></div>
<div class="REFTYPES"><span class="bold_code">Report = <span class="bold_code"><a href="#type-report">report()</a></span></span></div>
</div></p>
<div class="REFBODY"><p>
<p>Sends a user defined information report event to the error
logger. An event handler to handle the event is supposed to
have been added. The event is ignored by the standard event
handler.</p>
<p>It is recommended that <span class="code">Report</span> follows the same
structure as for <span class="code">info_report/1</span>.</p>
</p></div>
<p><a name="add_report_handler-1"></a><span class="bold_code">add_report_handler(Handler) -> any()</span><br><a name="add_report_handler-2"></a><span class="bold_code">add_report_handler(Handler, Args) -> Result</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Handler = module()</span></div>
<div class="REFTYPES"><span class="bold_code">Args = <span class="bold_code"><a href="javascript:erlhref('../../../../doc/../','stdlib','gen_event.html#type-handler_args');">gen_event:handler_args()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code">Result = <span class="bold_code"><a href="javascript:erlhref('../../../../doc/../','stdlib','gen_event.html#type-add_handler_ret');">gen_event:add_handler_ret()</a></span></span></div>
</div></p>
<div class="REFBODY"><p>
<p>Adds a new event handler to the error logger. The event
handler must be implemented as a <span class="code">gen_event</span> callback
module, see
<span class="bold_code"><a href="javascript:erlhref('../../../../doc/../','stdlib','gen_event.html');">gen_event(3)</a></span>.</p>
<p><span class="code">Handler</span> is typically the name of the callback module
and <span class="code">Args</span> is an optional term (defaults to []) passed
to the initialization callback function <span class="code">Handler:init/1</span>.
The function returns <span class="code">ok</span> if successful.</p>
<p>The event handler must be able to handle the
<span class="bold_code"><a href="#events">events</a></span> described below.</p>
</p></div>
<p><a name="delete_report_handler-1"></a><span class="bold_code">delete_report_handler(Handler) -> Result</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Handler = module()</span></div>
<div class="REFTYPES"><span class="bold_code">Result = <span class="bold_code"><a href="javascript:erlhref('../../../../doc/../','stdlib','gen_event.html#type-del_handler_ret');">gen_event:del_handler_ret()</a></span></span></div>
</div></p>
<div class="REFBODY"><p>
<p>Deletes an event handler from the error logger by calling
<span class="code">gen_event:delete_handler(error_logger, Handler, [])</span>,
see <span class="bold_code"><a href="javascript:erlhref('../../../../doc/../','stdlib','gen_event.html');">gen_event(3)</a></span>.</p>
</p></div>
<p><a name="tty-1"></a><span class="bold_code">tty(Flag) -> ok</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Flag = boolean()</span></div>
</div></p>
<div class="REFBODY"><p>
<p>Enables (<span class="code">Flag == true</span>) or disables
(<span class="code">Flag == false</span>) printout of standard events to the tty.</p>
<p>This is done by adding or deleting the standard event handler
for output to tty, thus calling this function overrides
the value of the Kernel <span class="code">error_logger</span> configuration
parameter.</p>
</p></div>
<p><a name="logfile-1"></a><span class="bold_code">logfile(Request :: {open, Filename}) -> ok | {error, OpenReason}</span><br><span class="bold_code">logfile(Request :: close) -> ok | {error, CloseReason}</span><br><span class="bold_code">logfile(Request :: filename) -> Filename | {error, FilenameReason}</span><br><div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES"><span class="bold_code">Filename = <span class="bold_code"><a href="file.html#type-name">file:name()</a></span></span></div>
<div class="REFTYPES"><span class="bold_code">OpenReason = allready_have_logfile | open_error()</span></div>
<div class="REFTYPES"><span class="bold_code">CloseReason = module_not_found</span></div>
<div class="REFTYPES"><span class="bold_code">FilenameReason = no_log_file</span></div>
<div class="REFTYPES">
<span class="bold_code">open_error() = <span class="bold_code"><a href="file.html#type-posix">file:posix()</a></span> | badarg | system_limit</span><br>
</div>
</div></p>
<div class="REFBODY"><p>
<p>Enables or disables printout of standard events to a file.</p>
<p>This is done by adding or deleting the standard event handler
for output to file, thus calling this function overrides
the value of the Kernel <span class="code">error_logger</span> configuration
parameter.</p>
<p>Enabling file logging can be used in combination with calling
<span class="code">tty(false)</span>, in order to have a silent system, where
all standard events are logged to a file only.
There can only be one active log file at a time.</p>
<p><span class="code">Request</span> is one of:</p>
<dl>
<dt><strong><span class="code">{open, Filename}</span></strong></dt>
<dd>
<p>Opens the log file <span class="code">Filename</span>. Returns <span class="code">ok</span> if
successful, or <span class="code">{error, allready_have_logfile}</span> if
logging to file is already enabled, or an error tuple if
another error occurred. For example, if <span class="code">Filename</span>
could not be opened.</p>
</dd>
<dt><strong><span class="code">close</span></strong></dt>
<dd>
<p>Closes the current log file. Returns <span class="code">ok</span>, or
<span class="code">{error, module_not_found}</span>.</p>
</dd>
<dt><strong><span class="code">filename</span></strong></dt>
<dd>
<p>Returns the name of the log file <span class="code">Filename</span>, or
<span class="code">{error, no_log_file}</span> if logging to file is not
enabled.</p>
</dd>
</dl>
</p></div>
<h3><a name="id112782">Events</a></h3>
<div class="REFBODY">
<a name="events"></a>
<p>All event handlers added to the error logger must handle
the following events. <span class="code">Gleader</span> is the group leader pid of
the process which sent the event, and <span class="code">Pid</span> is the process
which sent the event.</p>
<dl>
<dt><strong><span class="code">{error, Gleader, {Pid, Format, Data}}</span></strong></dt>
<dd>
<p>Generated when <span class="code">error_msg/1,2</span> or <span class="code">format</span> is
called.</p>
</dd>
<dt><strong><span class="code">{error_report, Gleader, {Pid, std_error, Report}}</span></strong></dt>
<dd>
<p>Generated when <span class="code">error_report/1</span> is called.</p>
</dd>
<dt><strong><span class="code">{error_report, Gleader, {Pid, Type, Report}}</span></strong></dt>
<dd>
<p>Generated when <span class="code">error_report/2</span> is called.</p>
</dd>
<dt><strong><span class="code">{warning_msg, Gleader, {Pid, Format, Data}}</span></strong></dt>
<dd>
<p>Generated when <span class="code">warning_msg/1,2</span> is called, provided
that warnings are set to be tagged as warnings.</p>
</dd>
<dt><strong><span class="code">{warning_report, Gleader, {Pid, std_warning, Report}}</span></strong></dt>
<dd>
<p>Generated when <span class="code">warning_report/1</span> is called, provided
that warnings are set to be tagged as warnings.</p>
</dd>
<dt><strong><span class="code">{warning_report, Gleader, {Pid, Type, Report}}</span></strong></dt>
<dd>
<p>Generated when <span class="code">warning_report/2</span> is called, provided
that warnings are set to be tagged as warnings.</p>
</dd>
<dt><strong><span class="code">{info_msg, Gleader, {Pid, Format, Data}}</span></strong></dt>
<dd>
<p>Generated when <span class="code">info_msg/1,2</span> is called.</p>
</dd>
<dt><strong><span class="code">{info_report, Gleader, {Pid, std_info, Report}}</span></strong></dt>
<dd>
<p>Generated when <span class="code">info_report/1</span> is called.</p>
</dd>
<dt><strong><span class="code">{info_report, Gleader, {Pid, Type, Report}}</span></strong></dt>
<dd>
<p>Generated when <span class="code">info_report/2</span> is called.</p>
</dd>
</dl>
<p>Note that also a number of system internal events may be
received, a catch-all clause last in the definition of
the event handler callback function <span class="code">Module:handle_event/2</span>
is necessary. This also holds true for
<span class="code">Module:handle_info/2</span>, as there are a number of system
internal messages the event handler must take care of as well.</p>
</div>
<h3><a name="id112971">SEE ALSO</a></h3>
<div class="REFBODY">
<p>gen_event(3), log_mf_h(3), kernel(6), sasl(6)</p>
</div>
</div>
<div class="footer">
<hr>
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