/usr/share/doc/perl-doc-html/sigtrap.html is in perl-doc-html 5.22.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 | <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title>sigtrap - perldoc.perl.org</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<meta http-equiv="Content-Language" content="en-gb">
<link rel="search" type="application/opensearchdescription+xml" title="Search perldoc.perl.org" href="/static/search.xml"/>
<link href="static/css-20100830.css" rel="stylesheet" rev="stylesheet" type="text/css" media="screen">
<link href="static/exploreperl.css" rel="stylesheet" rev="stylesheet" type="text/css">
</head>
<body onLoad="perldoc.startup();" onPageShow="if (event.persisted) perldoc.startup();">
<div id="page">
<div id="header">
<div id="homepage_link">
<a href="index.html"></a>
</div>
<div id="strapline">
Perl Programming Documentation
</div>
<div id="download_link" class="download">
<a href="http://www.perl.org/get.html">Download Perl</a>
</div>
<div id="explore_link" class="download">
<a id="explore_anchor" href="#">Explore</a>
</div>
</div>
<div id="body">
<div id="left_column">
<div class="side_group">
<div class="side_panel doc_panel">
<p>Manual</p>
<ul>
<li><a href="index-overview.html">Overview</a>
<li><a href="index-tutorials.html">Tutorials</a>
<li><a href="index-faq.html">FAQs</a>
<li><a href="index-history.html">History / Changes</a>
<li><a href="index-licence.html">License</a>
</ul>
</div>
<div class="side_panel doc_panel">
<p>Reference</p>
<ul>
<li><a href="index-language.html">Language</a>
<li><a href="index-functions.html">Functions</a>
<li><a href="perlop.html">Operators</a>
<li><a href="perlvar.html">Special Variables</a>
<li><a href="index-pragmas.html">Pragmas</a>
<li><a href="index-utilities.html">Utilities</a>
<li><a href="index-internals.html">Internals</a>
<li><a href="index-platforms.html">Platform Specific</a>
</ul>
</div>
<div class="side_panel doc_panel">
<p>Modules</p>
<ul>
<li>
<a href="index-modules-A.html">A</a>
•
<a href="index-modules-B.html">B</a>
•
<a href="index-modules-C.html">C</a>
•
<a href="index-modules-D.html">D</a>
•
<a href="index-modules-E.html">E</a>
<li>
<a href="index-modules-F.html">F</a>
•
<a href="index-modules-G.html">G</a>
•
<a href="index-modules-H.html">H</a>
•
<a href="index-modules-I.html">I</a>
•
<a href="index-modules-L.html">L</a>
<li>
<a href="index-modules-M.html">M</a>
•
<a href="index-modules-N.html">N</a>
•
<a href="index-modules-O.html">O</a>
•
<a href="index-modules-P.html">P</a>
•
<a href="index-modules-S.html">S</a>
<li>
<a href="index-modules-T.html">T</a>
•
<a href="index-modules-U.html">U</a>
•
<a href="index-modules-X.html">X</a>
</ul>
</div>
<div class="side_panel doc_panel">
<p>Tools</p>
<ul>
<li><a href="preferences.html">Preferences</a>
</ul>
</div>
</div>
</div>
<div id="centre_column">
<div id="content_header">
<div id="title_bar">
<div id="page_name">
<h1>sigtrap</h1>
</div>
<div id="perl_version">
Perl 5 version 22.0 documentation
</div>
<div class="page_links" id="page_links_top">
<a href="#" onClick="toolbar.goToTop();return false;">Go to top</a>
</div>
<div class="page_links" id="page_links_bottom">
<a href="#" id="page_index_toggle">Show page index</a> •
<a href="#" id="recent_pages_toggle">Show recent pages</a>
</div>
<div id="search_form">
<form action="search.html" method="GET" id="search">
<input type="text" name="q" id="search_box" alt="Search">
</form>
</div>
</div>
<div id="breadcrumbs">
<a href="index.html">Home</a> >
<a href="index-pragmas.html">Pragmas</a> >
sigtrap
</div>
</div>
<div id="content_body">
<!--[if lt IE 7]>
<div class="noscript">
<p>
<strong>It looks like you're using Internet Explorer 6. This is a very old
browser which does not offer full support for modern websites.</strong>
</p>
<p>
Unfortunately this means that this website will not work on
your computer.
</p>
<p>
Don't miss out though! To view the site (and get a better experience from
many other websites), simply upgrade to
<a href="http://www.microsoft.com/windows/Internet-explorer/default.aspx">Internet
Explorer 8</a>
or download an alternative browser such as
<a href="http://www.mozilla.com/en-US/firefox/firefox.html">Firefox</a>,
<a href="http://www.apple.com/safari/download/">Safari</a>, or
<a href="http://www.google.co.uk/chrome">Google Chrome</a>.
</p>
<p>
All of these browsers are free. If you're using a PC at work, you may
need to contact your IT administrator.
</p>
</div>
<![endif]-->
<noscript>
<div class="noscript">
<p>
<strong>Please note: Many features of this site require JavaScript. You appear to have JavaScript disabled,
or are running a non-JavaScript capable web browser.</strong>
</p>
<p>
To get the best experience, please enable JavaScript or download a modern web browser such as <a href="http://www.microsoft.com/windows/Internet-explorer/default.aspx">Internet Explorer 8</a>, <a href="http://www.mozilla.com/en-US/firefox/firefox.html">Firefox</a>, <a href="http://www.apple.com/safari/download/">Safari</a>, or <a href="http://www.google.co.uk/chrome">Google Chrome</a>.
</p>
</div>
</noscript>
<div id="recent_pages" class="hud_container">
<div id="recent_pages_header" class="hud_header">
<div id="recent_pages_close" class="hud_close"><a href="#" onClick="recentPages.hide();return false;"></a></div>
<div id="recent_pages_title" class="hud_title"><span class="hud_span_top">Recently read</span></div>
<div id="recent_pages_topright" class="hud_topright"></div>
</div>
<div id="recent_pages_content" class="hud_content">
</div>
<div id="recent_pages_footer" class="hud_footer">
<div id="recent_pages_bottomleft" class="hud_bottomleft"></div>
<div id="recent_pages_bottom" class="hud_bottom"><span class="hud_span_bottom"></span></div>
<div id="recent_pages_resize" class="hud_resize"></div>
</div>
</div>
<div id="from_search"></div>
<h1>sigtrap</h1>
<!-- -->
<ul><li><a href="#NAME">NAME</a><li><a href="#SYNOPSIS">SYNOPSIS</a><li><a href="#DESCRIPTION">DESCRIPTION</a><li><a href="#OPTIONS">OPTIONS</a><ul><li><a href="#SIGNAL-HANDLERS">SIGNAL HANDLERS</a><li><a href="#SIGNAL-LISTS">SIGNAL LISTS</a><li><a href="#OTHER">OTHER</a></ul><li><a href="#EXAMPLES">EXAMPLES</a></ul><a name="NAME"></a><h1>NAME</h1>
<p>sigtrap - Perl pragma to enable simple signal handling</p>
<a name="SYNOPSIS"></a><h1>SYNOPSIS</h1>
<pre class="verbatim"><ol><li> <a class="l_k" href="functions/use.html">use</a> <span class="w">sigtrap</span><span class="sc">;</span></li><li> <a class="l_k" href="functions/use.html">use</a> <span class="w">sigtrap</span> <span class="q">qw(stack-trace old-interface-signals)</span><span class="sc">;</span> <span class="c"># equivalent</span></li><li> <a class="l_k" href="functions/use.html">use</a> <span class="w">sigtrap</span> <span class="q">qw(BUS SEGV PIPE ABRT)</span><span class="sc">;</span></li><li> <a class="l_k" href="functions/use.html">use</a> <span class="w">sigtrap</span> <span class="q">qw(die INT QUIT)</span><span class="sc">;</span></li><li> <a class="l_k" href="functions/use.html">use</a> <span class="w">sigtrap</span> <span class="q">qw(die normal-signals)</span><span class="sc">;</span></li><li> <a class="l_k" href="functions/use.html">use</a> <span class="w">sigtrap</span> <span class="q">qw(die untrapped normal-signals)</span><span class="sc">;</span></li><li> <a class="l_k" href="functions/use.html">use</a> <span class="w">sigtrap</span> <span class="q">qw(die untrapped normal-signals</span></li><li> <span class="q">stack-trace any error-signals)</span><span class="sc">;</span></li><li> <a class="l_k" href="functions/use.html">use</a> <span class="w">sigtrap</span> <span class="q">'handler'</span> <span class="cm">=></span> \<span class="i">&my_handler</span><span class="cm">,</span> <span class="q">'normal-signals'</span><span class="sc">;</span></li><li> <a class="l_k" href="functions/use.html">use</a> <span class="w">sigtrap</span> <span class="q">qw(handler my_handler normal-signals</span></li><li> <span class="q">stack-trace error-signals)</span><span class="sc">;</span></li></ol></pre><a name="DESCRIPTION"></a><h1>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 class="inline"><a class="l_k" href="functions/die.html">die()</a></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 class="inline"><a class="l_k" href="functions/use.html">use</a></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>
<a name="OPTIONS"></a><h1>OPTIONS</h1>
<a name="SIGNAL-HANDLERS"></a><h2>SIGNAL HANDLERS</h2>
<p>These options affect which handler will be used for subsequently
installed signals.</p>
<ul>
<li><a name="*stack-trace*"></a><b><b>stack-trace</b></b>
<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>
</li>
<li><a name="*die*"></a><b><b>die</b></b>
<p>The handler used for subsequently installed signals calls <code class="inline"><a class="l_k" href="functions/die.html">die</a></code>
(actually <code class="inline"><span class="w">croak</span></code>
) with a message indicating which signal was caught.</p>
</li>
<li><a name="*handler*-_your-handler_"></a><b><b>handler</b> <i>your-handler</i></b>
<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 class="inline"><span class="i">%SIG</span></code>
. See <a href="perlvar.html">perlvar</a> for examples of
handler functions.</p>
</li>
</ul>
<a name="SIGNAL-LISTS"></a><h2>SIGNAL LISTS</h2>
<p><b>sigtrap</b> has a few built-in lists of signals to trap. They are:</p>
<ul>
<li><a name="*normal-signals*"></a><b><b>normal-signals</b></b>
<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>
</li>
<li><a name="*error-signals*"></a><b><b>error-signals</b></b>
<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>
</li>
<li><a name="*old-interface-signals*"></a><b><b>old-interface-signals</b></b>
<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>
</li>
</ul>
<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>
<a name="OTHER"></a><h2>OTHER</h2>
<ul>
<li><a name="*untrapped*"></a><b><b>untrapped</b></b>
<p>This token tells <b>sigtrap</b> to install handlers only for subsequently
listed signals which aren't already trapped or ignored.</p>
</li>
<li><a name="*any*"></a><b><b>any</b></b>
<p>This token tells <b>sigtrap</b> to install handlers for all subsequently
listed signals. This is the default behavior.</p>
</li>
<li><a name="_signal_"></a><b><i>signal</i></b>
<p>Any argument which looks like a signal name (that is,
<code class="inline"><span class="q">/^[A-Z][A-Z0-9]*$/</span></code>
) indicates that <b>sigtrap</b> should install a
handler for that name.</p>
</li>
<li><a name="_number_"></a><b><i>number</i></b>
<p>Require that at least version <i>number</i> of <b>sigtrap</b> is being used.</p>
</li>
</ul>
<a name="EXAMPLES"></a><h1>EXAMPLES</h1>
<p>Provide a stack trace for the old-interface-signals:</p>
<pre class="verbatim"><ol><li> <a class="l_k" href="functions/use.html">use</a> <span class="w">sigtrap</span><span class="sc">;</span></li></ol></pre><p>Ditto:</p>
<pre class="verbatim"><ol><li> <a class="l_k" href="functions/use.html">use</a> <span class="w">sigtrap</span> <span class="q">qw(stack-trace old-interface-signals)</span><span class="sc">;</span></li></ol></pre><p>Provide a stack trace on the 4 listed signals only:</p>
<pre class="verbatim"><ol><li> <a class="l_k" href="functions/use.html">use</a> <span class="w">sigtrap</span> <span class="q">qw(BUS SEGV PIPE ABRT)</span><span class="sc">;</span></li></ol></pre><p>Die on INT or QUIT:</p>
<pre class="verbatim"><ol><li> <a class="l_k" href="functions/use.html">use</a> <span class="w">sigtrap</span> <span class="q">qw(die INT QUIT)</span><span class="sc">;</span></li></ol></pre><p>Die on HUP, INT, PIPE or TERM:</p>
<pre class="verbatim"><ol><li> <a class="l_k" href="functions/use.html">use</a> <span class="w">sigtrap</span> <span class="q">qw(die normal-signals)</span><span class="sc">;</span></li></ol></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 class="verbatim"><ol><li> <a class="l_k" href="functions/use.html">use</a> <span class="w">sigtrap</span> <span class="q">qw(die untrapped normal-signals)</span><span class="sc">;</span></li></ol></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 class="verbatim"><ol><li> <a class="l_k" href="functions/use.html">use</a> <span class="w">sigtrap</span> <span class="q">qw(die untrapped normal-signals</span></li><li> <span class="q">stack-trace any error-signals)</span><span class="sc">;</span></li></ol></pre><p>Install my_handler() as the handler for the <b>normal-signals</b>:</p>
<pre class="verbatim"><ol><li> <a class="l_k" href="functions/use.html">use</a> <span class="w">sigtrap</span> <span class="q">'handler'</span><span class="cm">,</span> \<span class="i">&my_handler</span><span class="cm">,</span> <span class="q">'normal-signals'</span><span class="sc">;</span></li></ol></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 class="verbatim"><ol><li> <a class="l_k" href="functions/use.html">use</a> <span class="w">sigtrap</span> <span class="q">qw(handler my_handler normal-signals</span></li><li> <span class="q">stack-trace error-signals)</span><span class="sc">;</span></li></ol></pre>
<div id="page_index" class="hud_container">
<div id="page_index_header" class="hud_header">
<div id="page_index_close" class="hud_close"><a href="#" onClick="pageIndex.hide();return false;"></a></div>
<div id="page_index_title" class="hud_title"><span class="hud_span_top">Page index</span></div>
<div id="page_index_topright" class="hud_topright"></div>
</div>
<div id="page_index_content" class="hud_content">
<ul><li><a href="#NAME">NAME</a><li><a href="#SYNOPSIS">SYNOPSIS</a><li><a href="#DESCRIPTION">DESCRIPTION</a><li><a href="#OPTIONS">OPTIONS</a><ul><li><a href="#SIGNAL-HANDLERS">SIGNAL HANDLERS</a><li><a href="#SIGNAL-LISTS">SIGNAL LISTS</a><li><a href="#OTHER">OTHER</a></ul><li><a href="#EXAMPLES">EXAMPLES</a></ul>
</div>
<div id="page_index_footer" class="hud_footer">
<div id="page_index_bottomleft" class="hud_bottomleft"></div>
<div id="page_index_bottom" class="hud_bottom"><span class="hud_span_bottom"></span></div>
<div id="page_index_resize" class="hud_resize"></div>
</div>
</div>
</div>
<div id="content_footer">
</div>
</div>
<div class="clear"></div>
</div>
<div id="footer">
<div id="footer_content">
<div id="footer_strapline">
perldoc.perl.org - Official documentation for the Perl programming language
</div>
<div id="footer_links">
<div id="address">
<p class="name">Contact details</p>
<p class="address">
Site maintained by <a href="mailto:jj@jonallen.info">Jon Allen (JJ)</a><br>
</p>
<p class="contact">
Documentation maintained by the <a href="http://lists.cpan.org/showlist.cgi?name=perl5-porters">Perl 5 Porters</a>
</p>
</div>
<ul class="f1">
<li>Manual
<ul class="f2">
<li><a href="index-overview.html">Overview</a>
<li><a href="index-tutorials.html">Tutorials</a>
<li><a href="index-faq.html">FAQs</a>
<li><a href="index-history.html">Changes</a>
</ul>
<li>Reference
<ul class="f2">
<li><a href="index-language.html">Language</a>
<li><a href="index-functions.html">Functions</a>
<li><a href="perlop.html">Operators</a>
<li><a href="perlvar.html">Variables</a>
</ul>
<li>Modules
<ul class="f2">
<li><a href="index-modules-A.html">Modules</a>
<li><a href="index-pragmas.html">Pragmas</a>
<li><a href="index-utilities.html">Utilities</a>
</ul>
<li>Misc
<ul class="f2">
<li><a href="index-licence.html">License</a>
<li><a href="index-internals.html">Internals</a>
<li><a href="index-platforms.html">Platforms</a>
</ul> </ul>
<div class="clear"></div>
</div>
</div>
<div id="footer_end">
</div>
</div>
</div>
<script language="JavaScript" type="text/javascript" src="static/exploreperl.js"></script>
<script language="JavaScript" src="static/combined-20100403.js" type="text/javascript"></script>
<script language="JavaScript" type="text/javascript">
perldoc.setPath(0);
perldoc.pageName = 'sigtrap';
perldoc.pageAddress = 'sigtrap.html';
perldoc.contentPage = 1;
explorePerl.render();
explorePerl.addEvents('explore_anchor');
</script>
</body>
</html>
|