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<html><head><title>sigtrap (Perl in a Nutshell, 2nd Edition)</title><link rel="stylesheet" type="text/css" href="../style/style1.css" /><meta name="DC.Creator" content="Stephen Spainhour" /><meta name="DC.Format" content="text/xml" scheme="MIME" /><meta name="DC.Language" content="en-US" /><meta name="DC.Publisher" content="O'Reilly & Associates, Inc." /><meta name="DC.Source" scheme="ISBN" content="0596002416L" /><meta name="DC.Subject.Keyword" content="stuff" /><meta name="DC.Title" content="Perl in a Nutshell, 2nd Edition" /><meta name="DC.Type" content="Text.Monograph" /></head><body bgcolor="#ffffff"><img src="gifs/smbanner.gif" usemap="#banner-map" border="0" alt="Book Home" /><map name="banner-map"><area shape="rect" coords="1,-2,616,66" href="index.htm" alt="Java and XSLT" /><area shape="rect" coords="629,-11,726,25" href="jobjects/fsearch.htm" alt="Search this book" /></map><div class="navbar"><table width="684" border="0"><tr><td align="left" valign="top" width="228"><a href="ch08_185.htm"><img src="../gifs/txtpreva.gif" alt="Previous" border="0" /></a></td><td align="center" valign="top" width="228" /><td align="right" valign="top" width="228"><a href="ch08_187.htm"><img src="../gifs/txtnexta.gif" alt="Next" border="0" /></a></td></tr></table></div><h2 class="sect1">8.186. sigtrap</h2><p><a name="INDEX-1550" />Pragma toenable simple signal handling. Provides two signal handlers that canbe installed, or you can install your own handler; also providesoptions to specify which signals to trap. Ignores requests to trapsignals not used in your system's architecture.</p><blockquote><pre class="code">use sigtrap; # Initialize default signal handlersuse sigtrap qw(die normal-signals);use sigtrap 'handler' => \handlername, 'normal-signals';use sigtrap qw(handler handlername normal-signals stack-trace error-signals);</pre></blockquote><a name="perlnut2-CHP-8-SECT-186.1" /><div class="sect2"><h3 class="sect2">8.186.1. Signal Handler Options</h3><p>Used to specify which handler will be installed for signals installedafter the handler:</p><dl><dt><b><tt class="literal">die</tt></b></dt><dd>Installs handler that <tt class="literal">die</tt> s with a messageindicating the signal that was trapped.</p></dd><dt><b><tt class="literal">handler</tt> <em class="replaceable">handlername</em></b></dt><dd>Installs your handler <em class="replaceable"><tt>handlername</tt></em>.</p></dd><dt><b><tt class="literal">stack-trace</tt></b></dt><dd>Default signal handler. Outputs stack trace to STDERR and tries todump core.</p></dd></dl></div><a name="perlnut2-CHP-8-SECT-186.2" /><div class="sect2"><h3 class="sect2">8.186.2. Signal List Options</h3><p>You can specify your own list of options: </p><blockquote><pre class="code">use sigtrap qw(BUS SEGV PIPE ABRT);</pre></blockquote><p>or use one of the following built-in option lists:</p><dl><dt><b><tt class="literal">error-signals</tt></b></dt><dd>Signals that indicate a serious problem: ABRT, BUS, EMT, FPE, ILL,QUIT, SEGV, SYS, and TRAP.</p></dd><dt><b><tt class="literal">normal-signals</tt></b></dt><dd>Signals a program is most likely to encounter: HUP, INT, PIPE, andTERM.</p></dd><dt><b><tt class="literal">old-interface-signals</tt></b></dt><dd>Default. Signals trapped by default in older versions of<tt class="literal">sigtrap</tt>: ABRT, BUS, EMT, FPE, ILL, PIPE, QUIT,SEGV, SYS, TERM, and TRAP.</p></dd></dl></div><a name="perlnut2-CHP-8-SECT-186.3" /><div class="sect2"><h3 class="sect2">8.186.3. Other Options</h3><dl><dt><b><tt class="literal">any</tt></b></dt><dd>Installs handlers only for subsequently listed signals thataren't already taken care of.</p></dd><dt><i><em class="replaceable"><tt>number</tt></em></i></dt><dd>Requires that the version of <tt class="literal">sigtrap</tt> being usedmust be at least <em class="replaceable"><tt>number</tt></em>.</p></dd><dt><b><tt class="literal">signal</tt></b></dt><dd>Installs a handler for any argument that looks like a signal name.</p></dd><dt><b><tt class="literal">untrapped</tt></b></dt><dd>Installs handlers only for subsequently listed signals not alreadytrapped or ignored.</p></dd></dl></div><hr width="684" align="left" /><div class="navbar"><table width="684" border="0"><tr><td align="left" valign="top" width="228"><a href="ch08_185.htm"><img src="../gifs/txtpreva.gif" alt="Previous" border="0" /></a></td><td align="center" valign="top" width="228"><a href="index.htm"><img src="../gifs/txthome.gif" alt="Home" border="0" /></a></td><td align="right" valign="top" width="228"><a href="ch08_187.htm"><img src="../gifs/txtnexta.gif" alt="Next" border="0" /></a></td></tr><tr><td align="left" valign="top" width="228">8.185. Shell</td><td align="center" valign="top" width="228"><a href="index/index.htm"><img src="../gifs/index.gif" alt="Book Index" border="0" /></a></td><td align="right" valign="top" width="228">8.187. Socket</td></tr></table></div><hr width="684" align="left" /><img src="../gifs/navbar.gif" usemap="#library-map" border="0" alt="Library Navigation Links" /><p><p><font size="-1"><a href="copyrght.htm">Copyright © 2002</a> O'Reilly & Associates. 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