<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html xmlns:fn="http://www.w3.org/2005/02/xpath-functions">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<link rel="stylesheet" href="../otp_doc.css" type="text/css">
<title>Erlang -- Error Logging</title>
</head>
<body bgcolor="white" text="#000000" link="#0000ff" vlink="#ff00ff" alink="#ff0000"><div id="container">
<script id="js" type="text/javascript" language="JavaScript" src="../js/flipmenu/flipmenu.js"></script><script id="js2" type="text/javascript" src="../js/erlresolvelinks.js"></script><script language="JavaScript" type="text/javascript">
<!--
function getWinHeight() {
var myHeight = 0;
if( typeof( window.innerHeight ) == 'number' ) {
//Non-IE
myHeight = window.innerHeight;
} else if( document.documentElement && ( document.documentElement.clientWidth ||
document.documentElement.clientHeight ) ) {
//IE 6+ in 'standards compliant mode'
myHeight = document.documentElement.clientHeight;
} else if( document.body && ( document.body.clientWidth || document.body.clientHeight ) ) {
//IE 4 compatible
myHeight = document.body.clientHeight;
}
return myHeight;
}
function setscrollpos() {
var objf=document.getElementById('loadscrollpos');
document.getElementById("leftnav").scrollTop = objf.offsetTop - getWinHeight()/2;
}
function addEvent(obj, evType, fn){
if (obj.addEventListener){
obj.addEventListener(evType, fn, true);
return true;
} else if (obj.attachEvent){
var r = obj.attachEvent("on"+evType, fn);
return r;
} else {
return false;
}
}
addEvent(window, 'load', setscrollpos);
//--></script><div id="leftnav"><div class="innertube">
<img alt="Erlang logo" src="../erlang-logo.png"><br><small><a href="users_guide.html">User's Guide</a><br><a href="../pdf/otp-system-documentation-5.9.3.1.pdf">PDF</a><br><a href="../index.html">Top</a></small><p><strong>System Principles</strong><br><strong>User's Guide</strong><br><small>Version 5.9.3.1</small></p>
<br><a href="javascript:openAllFlips()">Expand All</a><br><a href="javascript:closeAllFlips()">Contract All</a><p><small><strong>Chapters</strong></small></p>
<ul class="flipMenu" imagepath="../js/flipmenu">
<li id="no" title="System Principles" expanded="false">System Principles<ul>
<li><a href="system_principles.html">
Top of chapter
</a></li>
<li title="Starting the System"><a href="system_principles.html#id61981">Starting the System</a></li>
<li title="Restarting and Stopping the System"><a href="system_principles.html#id57021">Restarting and Stopping the System</a></li>
<li title="Boot Scripts"><a href="system_principles.html#id62035">Boot Scripts</a></li>
<li title="Code Loading Strategy"><a href="system_principles.html#id57401">Code Loading Strategy</a></li>
<li title="File Types"><a href="system_principles.html#id62064">File Types</a></li>
</ul>
</li>
<li id="loadscrollpos" title="Error Logging" expanded="true">Error Logging<ul>
<li><a href="error_logging.html">
Top of chapter
</a></li>
<li title="Error Information From the Runtime System"><a href="error_logging.html#id61881">Error Information From the Runtime System</a></li>
<li title="SASL Error Logging"><a href="error_logging.html#id61705">SASL Error Logging</a></li>
</ul>
</li>
<li id="no" title="Creating a First Target System" expanded="false">Creating a First Target System<ul>
<li><a href="create_target.html">
Top of chapter
</a></li>
<li title="Introduction"><a href="create_target.html#id61819">Introduction</a></li>
<li title="Creating a Target System"><a href="create_target.html#id62160">Creating a Target System</a></li>
<li title="Installing a Target System"><a href="create_target.html#id60978">Installing a Target System</a></li>
<li title="Starting a Target System"><a href="create_target.html#id62461">Starting a Target System</a></li>
<li title="System Configuration Parameters"><a href="create_target.html#id62658">System Configuration Parameters</a></li>
<li title="Differences from the Install Script"><a href="create_target.html#id62706">Differences from the Install Script</a></li>
<li title="Listing of target_system.erl"><a href="create_target.html#id62734">Listing of target_system.erl</a></li>
</ul>
</li>
</ul>
</div></div>
<div id="content">
<div class="innertube">
<h1>2 Error Logging</h1>
<h3><a name="id61881">2.1
Error Information From the Runtime System</a></h3>
<p>Error information from the runtime system, that is, information
about a process terminating due to an uncaught error exception,
is by default written to terminal (tty):</p>
<div class="example"><pre>
=ERROR REPORT==== 9-Dec-2003::13:25:02 ===
Error in process <0.27.0> with exit value: {{badmatch,[1,2,3]},[{m,f,1},{shell,eval_loop,2}]}</pre></div>
<p>The error information is handled by the <strong>error logger</strong>, a
system process registered as <span class="code">error_logger</span>. This process
receives all error messages from the Erlang runtime system and
also from the standard behaviours and different Erlang/OTP
applications.</p>
<p>The exit reasons (such as <span class="code">badarg</span> above) used by
the runtime system are described in
<span class="bold_code"><a href="javascript:erlhref('../../','doc/reference_manual','errors.html#exit_reasons');">Errors and Error Handling</a></span>
in the Erlang Reference Manual.</p>
<p>The process <span class="code">error_logger</span> and its user interface (with
the same name) are described in
<span class="bold_code"><a href="javascript:erlhref('../../','kernel','error_logger.html');">error_logger(3)</a></span>.
It is possible to configure the system so that error information
is written to file instead/as well as tty. Also, it is possible
for user defined applications to send and format error
information using <span class="code">error_logger</span>.</p>
<h3><a name="id61705">2.2
SASL Error Logging</a></h3>
<p>The standard behaviors (<span class="code">supervisor</span>, <span class="code">gen_server</span>,
etc.) sends progress and error information to <span class="code">error_logger</span>.
If the SASL application is started, this information is written
to tty as well. See
<span class="bold_code"><a href="javascript:erlhref('../../','sasl','error_logging.html');">SASL Error Logging</a></span>
in the SASL User's Guide for further information.</p>
<div class="example"><pre>
% <span class="bold_code">erl -boot start_sasl</span>
Erlang (BEAM) emulator version 5.4.13 [hipe] [threads:0] [kernel-poll]
=PROGRESS REPORT==== 31-Mar-2006::12:45:58 ===
supervisor: {local,sasl_safe_sup}
started: [{pid,<0.33.0>},
{name,alarm_handler},
{mfa,{alarm_handler,start_link,[]}},
{restart_type,permanent},
{shutdown,2000},
{child_type,worker}]
=PROGRESS REPORT==== 31-Mar-2006::12:45:58 ===
supervisor: {local,sasl_safe_sup}
started: [{pid,<0.34.0>},
{name,overload},
{mfa,{overload,start_link,[]}},
{restart_type,permanent},
{shutdown,2000},
{child_type,worker}]
=PROGRESS REPORT==== 31-Mar-2006::12:45:58 ===
supervisor: {local,sasl_sup}
started: [{pid,<0.32.0>},
{name,sasl_safe_sup},
{mfa,{supervisor,
start_link,
[{local,sasl_safe_sup},sasl,safe]}},
{restart_type,permanent},
{shutdown,infinity},
{child_type,supervisor}]
=PROGRESS REPORT==== 31-Mar-2006::12:45:58 ===
supervisor: {local,sasl_sup}
started: [{pid,<0.35.0>},
{name,release_handler},
{mfa,{release_handler,start_link,[]}},
{restart_type,permanent},
{shutdown,2000},
{child_type,worker}]
=PROGRESS REPORT==== 31-Mar-2006::12:45:58 ===
application: sasl
started_at: nonode@nohost
Eshell V5.4.13 (abort with ^G)
1> </pre></div>
</div>
<div class="footer">
<hr>
<p>Copyright © 1996-2012 Ericsson AB. All Rights Reserved.</p>
</div>
</div>
</div></body>
</html>
distrib
>
Fedora
>
17
>
i386
>
media
>
updates
>
by-pkgid
>
675c8c8167236dfcf8d66da674f931e8
>
files
>
129
