sigtrap - Perl pragma to enable simple signal handling

<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1"> <title>sigtrap - Perl pragma to enable simple signal handling - Perldoc Browser</title> <link rel="search" href="/opensearch.xml" type="application/opensearchdescription+xml" title="Perldoc Browser"> <link rel="canonical" href="https://perldoc.perl.org/sigtrap"> <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.5.2/css/bootstrap.min.css" integrity="sha384-JcKb8q3iqJ61gNV9KGb8thSsNjpSL0n8PARn9HuZOnIxN0hoP+VmmDGMN5t9UJ0Z" crossorigin="anonymous"> <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/10.5.0/styles/stackoverflow-light.min.css" integrity="sha512-cG1IdFxqipi3gqLmksLtuk13C+hBa57a6zpWxMeoY3Q9O6ooFxq50DayCdm0QrDgZjMUn23z/0PMZlgft7Yp5Q==" crossorigin="anonymous" /> <style> body { background: #f4f4f5; color: #020202; } .navbar-dark { background-image: -webkit-linear-gradient(top, #005f85 0, #002e49 100%); background-image: -o-linear-gradient(top, #005f85 0, #002e49 100%); background-image: linear-gradient(to bottom, #005f85 0, #002e49 100%); filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#ff005f85', endColorstr='#ff002e49', GradientType=0); background-repeat: repeat-x; } .navbar-dark .navbar-nav .nav-link, .navbar-dark .navbar-nav .nav-link:focus { color: #fff } .navbar-dark .navbar-nav .nav-link:hover { color: #ffef68 } #wrapperlicious { margin: 0 auto; font: 0.9em 'Helvetica Neue', Helvetica, sans-serif; font-weight: normal; line-height: 1.5em; margin: 0; padding: 0; } #wrapperlicious h1 { font-size: 1.5em } #wrapperlicious h2 { font-size: 1.3em } #wrapperlicious h3 { font-size: 1.1em } #wrapperlicious h4 { font-size: 0.9em } #wrapperlicious h1, #wrapperlicious h2, #wrapperlicious h3, #wrapperlicious h4, #wrapperlicious dt { color: #020202; margin-top: 1em; margin-bottom: 1em; position: relative; font-weight: bold; } #wrapperlicious a { color: inherit; text-decoration: underline } #wrapperlicious #toc { text-decoration: none } #wrapperlicious a:hover { color: #2a2a2a } #wrapperlicious a img { border: 0 } #wrapperlicious :not(pre) > code { color: inherit; background-color: rgba(0, 0, 0, 0.04); border-radius: 3px; font: 0.9em Consolas, Menlo, Monaco, monospace; padding: 0.3em; } #wrapperlicious dd { margin: 0; margin-left: 2em; } #wrapperlicious dt { color: #2a2a2a; font-weight: bold; margin-left: 0.9em; } #wrapperlicious p { margin-bottom: 1em; margin-top: 1em; } #wrapperlicious li > p { margin-bottom: 0; margin-top: 0; } #wrapperlicious pre { border: 1px solid #c1c1c1; border-radius: 3px; font: 100% Consolas, Menlo, Monaco, monospace; margin-bottom: 1em; margin-top: 1em; } #wrapperlicious pre > code { display: block; background-color: #f6f6f6; font: 0.9em Consolas, Menlo, Monaco, monospace; line-height: 1.5em; text-align: left; white-space: pre; padding: 1em; } #wrapperlicious dl, #wrapperlicious ol, #wrapperlicious ul { margin-bottom: 1em; margin-top: 1em; } #wrapperlicious ul { list-style-type: square; } #wrapperlicious ul ul { margin-bottom: 0px; margin-top: 0px; } #footer { font-size: 0.8em; padding-top: 0.5em; text-align: center; } #more { display: inline; font-size: 0.8em; } #perldocdiv { background-color: #fff; border: 1px solid #c1c1c1; border-bottom-left-radius: 5px; border-bottom-right-radius: 5px; margin-left: auto; margin-right: auto; padding: 3em; padding-top: 1em; max-width: 960px; } #moduleversion { float: right } #wrapperlicious .leading-notice { font-style: italic; padding-left: 1em; margin-top: 1em; margin-bottom: 1em; } #wrapperlicious .permalink { display: none; left: -0.75em; position: absolute; padding-right: 0.25em; text-decoration: none; } #wrapperlicious h1:hover .permalink, #wrapperlicious h2:hover .permalink, #wrapperlicious h3:hover .permalink, #wrapperlicious h4:hover .permalink, #wrapperlicious dt:hover .permalink { display: block; } </style>  <script async src="https://www.googletagmanager.com/gtag/js?id=G-KVNWBNT5FB"></script> <script> window.dataLayer = window.dataLayer || []; function gtag(){dataLayer.push(arguments);} gtag('js', new Date()); gtag('config', 'G-KVNWBNT5FB'); gtag('config', 'UA-50555-3'); </script> </head> <body> <nav class="navbar navbar-expand-md navbar-dark bg-dark justify-content-between"> <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarNav" aria-controls="navbarNav" aria-expanded="false" aria-label="Toggle navigation"> <span class="navbar-toggler-icon"></span> </button> <a class="navbar-brand" href="/"><img src="/images/perl_camel_30.png" width="30" height="30" class="d-inline-block align-top" alt="Perl Camel Logo"> Perldoc Browser</a> <div class="collapse navbar-collapse" id="navbarNav"> <ul class="navbar-nav mr-auto"> <li class="nav-item dropdown text-nowrap"> <a class="nav-link dropdown-toggle" href="#" id="dropdownlink-stable" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">5.32.1</a> <div class="dropdown-menu" aria-labelledby="dropdownlink-stable"> <a class="dropdown-item" href="/sigtrap">Latest</a> <div class="dropdown-divider"></div> <a class="dropdown-item" href="/5.40.1/sigtrap">5.40.1</a> <a class="dropdown-item" href="/5.40.0/sigtrap">5.40.0</a> <div class="dropdown-divider"></div> <a class="dropdown-item" href="/5.38.3/sigtrap">5.38.3</a> <a class="dropdown-item" href="/5.38.2/sigtrap">5.38.2</a> <a class="dropdown-item" href="/5.38.1/sigtrap">5.38.1</a> <a class="dropdown-item" href="/5.38.0/sigtrap">5.38.0</a> <div class="dropdown-divider"></div> <a class="dropdown-item" href="/5.36.3/sigtrap">5.36.3</a> <a class="dropdown-item" href="/5.36.2/sigtrap">5.36.2</a> <a class="dropdown-item" href="/5.36.1/sigtrap">5.36.1</a> <a class="dropdown-item" href="/5.36.0/sigtrap">5.36.0</a> <div class="dropdown-divider"></div> <a class="dropdown-item" href="/5.34.3/sigtrap">5.34.3</a> <a class="dropdown-item" href="/5.34.2/sigtrap">5.34.2</a> <a class="dropdown-item" href="/5.34.1/sigtrap">5.34.1</a> <a class="dropdown-item" href="/5.34.0/sigtrap">5.34.0</a> <div class="dropdown-divider"></div> <a class="dropdown-item active" href="/5.32.1/sigtrap">5.32.1</a> <a class="dropdown-item" href="/5.32.0/sigtrap">5.32.0</a> <div class="dropdown-divider"></div> <a class="dropdown-item" href="/5.30.3/sigtrap">5.30.3</a> <a class="dropdown-item" href="/5.30.2/sigtrap">5.30.2</a> <a class="dropdown-item" href="/5.30.1/sigtrap">5.30.1</a> <a class="dropdown-item" href="/5.30.0/sigtrap">5.30.0</a> <div class="dropdown-divider"></div> <a class="dropdown-item" href="/5.28.3/sigtrap">5.28.3</a> <a class="dropdown-item" href="/5.28.2/sigtrap">5.28.2</a> <a class="dropdown-item" href="/5.28.1/sigtrap">5.28.1</a> <a class="dropdown-item" href="/5.28.0/sigtrap">5.28.0</a> <div class="dropdown-divider"></div> <a class="dropdown-item" href="/5.26.3/sigtrap">5.26.3</a> <a class="dropdown-item" href="/5.26.2/sigtrap">5.26.2</a> <a class="dropdown-item" href="/5.26.1/sigtrap">5.26.1</a> <a class="dropdown-item" href="/5.26.0/sigtrap">5.26.0</a> <div class="dropdown-divider"></div> <a class="dropdown-item" href="/5.24.4/sigtrap">5.24.4</a> <a class="dropdown-item" href="/5.24.3/sigtrap">5.24.3</a> <a class="dropdown-item" href="/5.24.2/sigtrap">5.24.2</a> <a class="dropdown-item" href="/5.24.1/sigtrap">5.24.1</a> <a class="dropdown-item" href="/5.24.0/sigtrap">5.24.0</a> <div class="dropdown-divider"></div> <a class="dropdown-item" href="/5.22.4/sigtrap">5.22.4</a> <a class="dropdown-item" href="/5.22.3/sigtrap">5.22.3</a> <a class="dropdown-item" href="/5.22.2/sigtrap">5.22.2</a> <a class="dropdown-item" href="/5.22.1/sigtrap">5.22.1</a> <a class="dropdown-item" href="/5.22.0/sigtrap">5.22.0</a> <div class="dropdown-divider"></div> <a class="dropdown-item" href="/5.20.3/sigtrap">5.20.3</a> <a class="dropdown-item" href="/5.20.2/sigtrap">5.20.2</a> <a class="dropdown-item" href="/5.20.1/sigtrap">5.20.1</a> <a class="dropdown-item" href="/5.20.0/sigtrap">5.20.0</a> <div class="dropdown-divider"></div> <a class="dropdown-item" href="/5.18.4/sigtrap">5.18.4</a> <a class="dropdown-item" href="/5.18.3/sigtrap">5.18.3</a> <a class="dropdown-item" href="/5.18.2/sigtrap">5.18.2</a> <a class="dropdown-item" href="/5.18.1/sigtrap">5.18.1</a> <a class="dropdown-item" href="/5.18.0/sigtrap">5.18.0</a> <div class="dropdown-divider"></div> <a class="dropdown-item" href="/5.16.3/sigtrap">5.16.3</a> <a class="dropdown-item" href="/5.16.2/sigtrap">5.16.2</a> <a class="dropdown-item" href="/5.16.1/sigtrap">5.16.1</a> <a class="dropdown-item" href="/5.16.0/sigtrap">5.16.0</a> <div class="dropdown-divider"></div> <a class="dropdown-item" href="/5.14.4/sigtrap">5.14.4</a> <a class="dropdown-item" href="/5.14.3/sigtrap">5.14.3</a> <a class="dropdown-item" href="/5.14.2/sigtrap">5.14.2</a> <a class="dropdown-item" href="/5.14.1/sigtrap">5.14.1</a> <a class="dropdown-item" href="/5.14.0/sigtrap">5.14.0</a> <div class="dropdown-divider"></div> <a class="dropdown-item" href="/5.12.5/sigtrap">5.12.5</a> <a class="dropdown-item" href="/5.12.4/sigtrap">5.12.4</a> <a class="dropdown-item" href="/5.12.3/sigtrap">5.12.3</a> <a class="dropdown-item" href="/5.12.2/sigtrap">5.12.2</a> <a class="dropdown-item" href="/5.12.1/sigtrap">5.12.1</a> <a class="dropdown-item" href="/5.12.0/sigtrap">5.12.0</a> <div class="dropdown-divider"></div> <a class="dropdown-item" href="/5.10.1/sigtrap">5.10.1</a> <a class="dropdown-item" href="/5.10.0/sigtrap">5.10.0</a> <div class="dropdown-divider"></div> <a class="dropdown-item" href="/5.8.9/sigtrap">5.8.9</a> <a class="dropdown-item" href="/5.8.8/sigtrap">5.8.8</a> <a class="dropdown-item" href="/5.8.7/sigtrap">5.8.7</a> <a class="dropdown-item" href="/5.8.6/sigtrap">5.8.6</a> <a class="dropdown-item" href="/5.8.5/sigtrap">5.8.5</a> <a class="dropdown-item" href="/5.8.4/sigtrap">5.8.4</a> <a class="dropdown-item" href="/5.8.3/sigtrap">5.8.3</a> <a class="dropdown-item" href="/5.8.2/sigtrap">5.8.2</a> <a class="dropdown-item" href="/5.8.1/sigtrap">5.8.1</a> <a class="dropdown-item" href="/5.8.0/sigtrap">5.8.0</a> <div class="dropdown-divider"></div> <a class="dropdown-item" href="/5.6.2/sigtrap">5.6.2</a> <a class="dropdown-item" href="/5.6.1/sigtrap">5.6.1</a> <a class="dropdown-item" href="/5.6.0/sigtrap">5.6.0</a> <div class="dropdown-divider"></div> <a class="dropdown-item" href="/5.005_04/sigtrap">5.005_04</a> <a class="dropdown-item" href="/5.005_03/sigtrap">5.005_03</a> <a class="dropdown-item" href="/5.005_02/sigtrap">5.005_02</a> <a class="dropdown-item" href="/5.005_01/sigtrap">5.005_01</a> <a class="dropdown-item" href="/5.005/sigtrap">5.005</a> </div> </li> <li class="nav-item dropdown text-nowrap"> <a class="nav-link dropdown-toggle" href="#" id="dropdownlink-dev" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">Dev</a> <div class="dropdown-menu" aria-labelledby="dropdownlink-dev"> <a class="dropdown-item" href="/blead/sigtrap">blead</a> <a class="dropdown-item" href="/5.41.9/sigtrap">5.41.9</a> <a class="dropdown-item" href="/5.41.8/sigtrap">5.41.8</a> <a class="dropdown-item" href="/5.41.7/sigtrap">5.41.7</a> <a class="dropdown-item" href="/5.41.6/sigtrap">5.41.6</a> <a class="dropdown-item" href="/5.41.5/sigtrap">5.41.5</a> <a class="dropdown-item" href="/5.41.4/sigtrap">5.41.4</a> <a class="dropdown-item" href="/5.41.3/sigtrap">5.41.3</a> <a class="dropdown-item" href="/5.41.2/sigtrap">5.41.2</a> <a class="dropdown-item" href="/5.41.1/sigtrap">5.41.1</a> <div class="dropdown-divider"></div> <a class="dropdown-item" href="/5.40.1-RC1/sigtrap">5.40.1-RC1</a> <a class="dropdown-item" href="/5.40.0-RC2/sigtrap">5.40.0-RC2</a> <a class="dropdown-item" href="/5.40.0-RC1/sigtrap">5.40.0-RC1</a> <div class="dropdown-divider"></div> <a class="dropdown-item" href="/5.39.10/sigtrap">5.39.10</a> <a class="dropdown-item" href="/5.39.9/sigtrap">5.39.9</a> <a class="dropdown-item" href="/5.39.8/sigtrap">5.39.8</a> <a class="dropdown-item" href="/5.39.7/sigtrap">5.39.7</a> <a class="dropdown-item" href="/5.39.6/sigtrap">5.39.6</a> <a class="dropdown-item" href="/5.39.5/sigtrap">5.39.5</a> <a class="dropdown-item" href="/5.39.4/sigtrap">5.39.4</a> <a class="dropdown-item" href="/5.39.3/sigtrap">5.39.3</a> <a class="dropdown-item" href="/5.39.2/sigtrap">5.39.2</a> <a class="dropdown-item" href="/5.39.1/sigtrap">5.39.1</a> <div class="dropdown-divider"></div> <a class="dropdown-item" href="/5.38.3-RC1/sigtrap">5.38.3-RC1</a> </div> </li> <li class="nav-item dropdown text-nowrap"> <a class="nav-link dropdown-toggle" href="#" id="dropdownlink-nav" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">Documentation</a> <div class="dropdown-menu" aria-labelledby="dropdownlink-nav"> <a class="dropdown-item" href="/5.32.1/perl">Perl</a> <a class="dropdown-item" href="/5.32.1/perlintro">Intro</a> <a class="dropdown-item" href="/5.32.1/perl#Tutorials">Tutorials</a> <a class="dropdown-item" href="/5.32.1/perlfaq">FAQs</a> <a class="dropdown-item" href="/5.32.1/perl#Reference-Manual">Reference</a> <div class="dropdown-divider"></div> <a class="dropdown-item" href="/5.32.1/perlop">Operators</a> <a class="dropdown-item" href="/5.32.1/functions">Functions</a> <a class="dropdown-item" href="/5.32.1/variables">Variables</a> <a class="dropdown-item" href="/5.32.1/modules">Modules</a> <a class="dropdown-item" href="/5.32.1/perlutil">Utilities</a> <div class="dropdown-divider"></div> <a class="dropdown-item" href="/5.32.1/perldelta">Release Notes</a> <a class="dropdown-item" href="/5.32.1/perlcommunity">Community</a> <a class="dropdown-item" href="/5.32.1/perlhist">History</a> </div> </li> </ul> <ul class="navbar-nav"> <script> function set_expand (expand) { var perldocdiv = document.getElementById('perldocdiv'); var width = window.getComputedStyle(perldocdiv).getPropertyValue('max-width'); var expanded = (width == '' || width == 'none') ? true : false; if (expand === null) { expand = !expanded; } if ((expand && !expanded) || (!expand && expanded)) { perldocdiv.style.setProperty('max-width', expand ? 'none' : '960px'); var button_classlist = document.getElementById('content-expand-button').classList; if (expand) { button_classlist.add('btn-light'); button_classlist.remove('btn-outline-light'); } else { button_classlist.add('btn-outline-light'); button_classlist.remove('btn-light'); } } return expand; } function toggle_expand () { var expand = set_expand(null); document.cookie = 'perldoc_expand=' + (expand ? 1 : 0) + '; path=/; expires=Tue, 19 Jan 2038 03:14:07 UTC'; } function read_expand () { return document.cookie.split(';').some(function (item) { return item.indexOf('perldoc_expand=1') >= 0 }); } if (document.readyState === 'loading') { document.addEventListener('DOMContentLoaded', function () { if (read_expand()) { set_expand(true); } }); } else if (read_expand()) { set_expand(true); } </script> <button id="content-expand-button" type="button" class="btn btn-outline-light d-none d-lg-inline-block mr-4" onclick="toggle_expand()">Expand</button> </ul> <form class="form-inline" method="get" action="/5.32.1/search"> <input class="form-control mr-3" type="search" name="q" placeholder="Search" aria-label="Search" value=""> </form> </div> </nav> <div id="wrapperlicious" class="container-fluid"> <div id="perldocdiv"> <div id="links"> <a href="/5.32.1/sigtrap">sigtrap</a> <div id="more"> (<a href="/5.32.1/sigtrap.txt">source</a>, <a href="https://metacpan.org/pod/sigtrap">CPAN</a>) </div> <div id="moduleversion">version 1.09</div> </div> <div class="leading-notice"> You are viewing the version of this documentation from Perl 5.32.1. <a href="/sigtrap">View the latest version</a> </div> <h1><a id="toc">CONTENTS</a></h1> <ul> <li> <a class="text-decoration-none" href="#NAME">NAME</a> </li> <li> <a class="text-decoration-none" href="#SYNOPSIS">SYNOPSIS</a> </li> <li> <a class="text-decoration-none" href="#DESCRIPTION">DESCRIPTION</a> </li> <li> <a class="text-decoration-none" href="#OPTIONS">OPTIONS</a> <ul> <li> <a class="text-decoration-none" href="#SIGNAL-HANDLERS">SIGNAL HANDLERS</a> </li> <li> <a class="text-decoration-none" href="#SIGNAL-LISTS">SIGNAL LISTS</a> </li> <li> <a class="text-decoration-none" href="#OTHER">OTHER</a> </li> </ul> </li> <li> <a class="text-decoration-none" href="#EXAMPLES">EXAMPLES</a> </li> </ul> <h1 id="NAME"><a class="permalink" href="#NAME">#</a>NAME</h1> <p>sigtrap - Perl pragma to enable simple signal handling</p> <h1 id="SYNOPSIS"><a class="permalink" href="#SYNOPSIS">#</a>SYNOPSIS</h1> <pre><code> use sigtrap; use sigtrap qw(stack-trace old-interface-signals); # equivalent use sigtrap qw(BUS SEGV PIPE ABRT); use sigtrap qw(die INT QUIT); use sigtrap qw(die normal-signals); use sigtrap qw(die untrapped normal-signals); use sigtrap qw(die untrapped normal-signals stack-trace any error-signals); use sigtrap 'handler' => \&my_handler, 'normal-signals'; use sigtrap qw(handler my_handler normal-signals stack-trace error-signals);</code></pre> <h1 id="DESCRIPTION"><a class="permalink" href="#DESCRIPTION">#</a>DESCRIPTION</h1> <p>The <b>sigtrap</b> pragma is a simple interface to installing signal handlers. You can have it install one of two handlers supplied by <b>sigtrap</b> itself (one which provides a Perl stack trace and one which simply <code>die()</code>s), or alternately you can supply your own handler for it to install. It can be told only to install a handler for signals which are either untrapped or ignored. It has a couple of lists of signals to trap, plus you can supply your own list of signals.</p> <p>The arguments passed to the <code>use</code> statement which invokes <b>sigtrap</b> are processed in order. When a signal name or the name of one of <b>sigtrap</b>'s signal lists is encountered a handler is immediately installed, when an option is encountered it affects subsequently installed handlers.</p> <h1 id="OPTIONS"><a class="permalink" href="#OPTIONS">#</a>OPTIONS</h1> <h2 id="SIGNAL-HANDLERS"><a class="permalink" href="#SIGNAL-HANDLERS">#</a><a id="SIGNAL"></a>SIGNAL HANDLERS</h2> <p>These options affect which handler will be used for subsequently installed signals.</p> <dl> <dt id="stack-trace"><a class="permalink" href="#stack-trace">#</a><a id="stack"></a><b>stack-trace</b></dt> <dd> <p>The handler used for subsequently installed signals outputs a Perl stack trace to STDERR and then tries to dump core. This is the default signal handler.</p> </dd> <dt id="die"><a class="permalink" href="#die">#</a><b>die</b></dt> <dd> <p>The handler used for subsequently installed signals calls <code>die</code> (actually <code>croak</code>) with a message indicating which signal was caught.</p> </dd> <dt id="handler-your-handler"><a class="permalink" href="#handler-your-handler">#</a><a id="handler"></a><b>handler</b> <i>your-handler</i></dt> <dd> <p><i>your-handler</i> will be used as the handler for subsequently installed signals. <i>your-handler</i> can be any value which is valid as an assignment to an element of <code>%SIG</code>. See <a href="/5.32.1/perlvar">perlvar</a> for examples of handler functions.</p> </dd> </dl> <h2 id="SIGNAL-LISTS"><a class="permalink" href="#SIGNAL-LISTS">#</a><a id="SIGNAL1"></a>SIGNAL LISTS</h2> <p><b>sigtrap</b> has a few built-in lists of signals to trap. They are:</p> <dl> <dt id="normal-signals"><a class="permalink" href="#normal-signals">#</a><a id="normal"></a><b>normal-signals</b></dt> <dd> <p>These are the signals which a program might normally expect to encounter and which by default cause it to terminate. They are HUP, INT, PIPE and TERM.</p> </dd> <dt id="error-signals"><a class="permalink" href="#error-signals">#</a><a id="error"></a><b>error-signals</b></dt> <dd> <p>These signals usually indicate a serious problem with the Perl interpreter or with your script. They are ABRT, BUS, EMT, FPE, ILL, QUIT, SEGV, SYS and TRAP.</p> </dd> <dt id="old-interface-signals"><a class="permalink" href="#old-interface-signals">#</a><a id="old"></a><b>old-interface-signals</b></dt> <dd> <p>These are the signals which were trapped by default by the old <b>sigtrap</b> interface, they are ABRT, BUS, EMT, FPE, ILL, PIPE, QUIT, SEGV, SYS, TERM, and TRAP. If no signals or signals lists are passed to <b>sigtrap</b>, this list is used.</p> </dd> </dl> <p>For each of these three lists, the collection of signals set to be trapped is checked before trapping; if your architecture does not implement a particular signal, it will not be trapped but rather silently ignored.</p> <h2 id="OTHER"><a class="permalink" href="#OTHER">#</a>OTHER</h2> <dl> <dt id="untrapped"><a class="permalink" href="#untrapped">#</a><b>untrapped</b></dt> <dd> <p>This token tells <b>sigtrap</b> to install handlers only for subsequently listed signals which aren't already trapped or ignored.</p> </dd> <dt id="any"><a class="permalink" href="#any">#</a><b>any</b></dt> <dd> <p>This token tells <b>sigtrap</b> to install handlers for all subsequently listed signals. This is the default behavior.</p> </dd> <dt id="signal"><a class="permalink" href="#signal">#</a><i>signal</i></dt> <dd> <p>Any argument which looks like a signal name (that is, <code>/^[A-Z][A-Z0-9]*$/</code>) indicates that <b>sigtrap</b> should install a handler for that name.</p> </dd> <dt id="number"><a class="permalink" href="#number">#</a><i>number</i></dt> <dd> <p>Require that at least version <i>number</i> of <b>sigtrap</b> is being used.</p> </dd> </dl> <h1 id="EXAMPLES"><a class="permalink" href="#EXAMPLES">#</a>EXAMPLES</h1> <p>Provide a stack trace for the old-interface-signals:</p> <pre><code>use sigtrap;</code></pre> <p>Ditto:</p> <pre><code>use sigtrap qw(stack-trace old-interface-signals);</code></pre> <p>Provide a stack trace on the 4 listed signals only:</p> <pre><code>use sigtrap qw(BUS SEGV PIPE ABRT);</code></pre> <p>Die on INT or QUIT:</p> <pre><code>use sigtrap qw(die INT QUIT);</code></pre> <p>Die on HUP, INT, PIPE or TERM:</p> <pre><code>use sigtrap qw(die normal-signals);</code></pre> <p>Die on HUP, INT, PIPE or TERM, except don't change the behavior for signals which are already trapped or ignored:</p> <pre><code>use sigtrap qw(die untrapped normal-signals);</code></pre> <p>Die on receipt one of an of the <b>normal-signals</b> which is currently <b>untrapped</b>, provide a stack trace on receipt of <b>any</b> of the <b>error-signals</b>:</p> <pre><code> use sigtrap qw(die untrapped normal-signals stack-trace any error-signals);</code></pre> <p>Install my_handler() as the handler for the <b>normal-signals</b>:</p> <pre><code>use sigtrap 'handler', \&my_handler, 'normal-signals';</code></pre> <p>Install my_handler() as the handler for the normal-signals, provide a Perl stack trace on receipt of one of the error-signals:</p> <pre><code>use sigtrap qw(handler my_handler normal-signals stack-trace error-signals);</code></pre> </div> <div id="footer"> <p>Perldoc Browser is maintained by Dan Book (<a href="https://metacpan.org/author/DBOOK">DBOOK</a>). Please contact him via the <a href="https://github.com/Grinnz/perldoc-browser/issues">GitHub issue tracker</a> or <a href="mailto:dbook@cpan.org">email</a> regarding any issues with the site itself, search, or rendering of documentation.</p> <p>The Perl documentation is maintained by the Perl 5 Porters in the development of Perl. Please contact them via the <a href="https://github.com/Perl/perl5/issues">Perl issue tracker</a>, the <a href="https://lists.perl.org/list/perl5-porters.html">mailing list</a>, or <a href="https://kiwiirc.com/client/irc.perl.org/p5p">IRC</a> to report any issues with the contents or format of the documentation.</p> </div> </div> <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.5.1/jquery.slim.min.js" integrity="sha512-/DXTXr6nQodMUiq+IUJYCt2PPOUjrHJ9wFrqpJ3XkgPNOZVfMok7cRw6CSxyCQxXn6ozlESsSh1/sMCTF1rL/g==" crossorigin="anonymous"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.16.1/umd/popper.min.js" integrity="sha512-ubuT8Z88WxezgSqf3RLuNi5lmjstiJcyezx34yIU2gAHonIi27Na7atqzUZCOoY4CExaoFumzOsFQ2Ch+I/HCw==" crossorigin="anonymous"></script> <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.5.2/js/bootstrap.min.js" integrity="sha384-B4gt1jrGC7Jh4AgTPSdUtOBvfO8shuf57BaghqFfPlYxofvL8/KUEfYiJOMMV+rV" crossorigin="anonymous"></script> <script src="/js/highlight.pack.js"></script> <script>hljs.highlightAll();</script> </body> </html>

CINXE.COM

sigtrap - Perl pragma to enable simple signal handling - Perldoc Browser