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Source of: /manual/en/pcntl.example.php

<?php
include_once $_SERVER['DOCUMENT_ROOT'] . '/include/shared-manual.inc';
$TOC = array();
$PARENTS = array();
include_once dirname(__FILE__) ."/toc/pcntl.examples.inc";
$setup = array (
  'home' =>
  array (
    0 => 'index.php',
    1 => 'PHP Manual',
  ),
  'head' =>
  array (
    0 => 'UTF-8',
    1 => 'en',
  ),
  'this' =>
  array (
    0 => 'pcntl.example.php',
    1 => 'Process Control Example',
  ),
  'up' =>
  array (
    0 => 'pcntl.examples.php',
    1 => 'Examples',
  ),
  'prev' =>
  array (
    0 => 'pcntl.examples.php',
    1 => 'Examples',
  ),
  'next' =>
  array (
    0 => 'ref.pcntl.php',
    1 => 'PCNTL Functions',
  ),
);
$setup["toc"] = $TOC;
$setup["parents"] = $PARENTS;
manual_setup($setup);

manual_header();
?>
<div id="pcntl.example" class="section">
  <p class="para">
   This example forks off a daemon process with a signal handler.
  </p>
  <div class="example">
   <p><b>Example #1 Process Control Example</b></p>
   <div class="example-contents programlisting">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br /></span><span style="color: #007700">declare(</span><span style="color: #0000BB">ticks</span><span style="color: #007700">=</span><span style="color: #0000BB">1</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">$pid&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">pcntl_fork</span><span style="color: #007700">();<br />if&nbsp;(</span><span style="color: #0000BB">$pid&nbsp;</span><span style="color: #007700">==&nbsp;-</span><span style="color: #0000BB">1</span><span style="color: #007700">)&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;die(</span><span style="color: #DD0000">"could&nbsp;not&nbsp;fork"</span><span style="color: #007700">);&nbsp;<br />}&nbsp;else&nbsp;if&nbsp;(</span><span style="color: #0000BB">$pid</span><span style="color: #007700">)&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;exit();&nbsp;</span><span style="color: #FF8000">//&nbsp;we&nbsp;are&nbsp;the&nbsp;parent&nbsp;<br /></span><span style="color: #007700">}&nbsp;else&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #FF8000">//&nbsp;we&nbsp;are&nbsp;the&nbsp;child<br /></span><span style="color: #007700">}<br /><br /></span><span style="color: #FF8000">//&nbsp;detatch&nbsp;from&nbsp;the&nbsp;controlling&nbsp;terminal<br /></span><span style="color: #007700">if&nbsp;(</span><span style="color: #0000BB">posix_setsid</span><span style="color: #007700">()&nbsp;==&nbsp;-</span><span style="color: #0000BB">1</span><span style="color: #007700">)&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;die(</span><span style="color: #DD0000">"could&nbsp;not&nbsp;detach&nbsp;from&nbsp;terminal"</span><span style="color: #007700">);<br />}<br /><br /></span><span style="color: #FF8000">//&nbsp;setup&nbsp;signal&nbsp;handlers<br /></span><span style="color: #0000BB">pcntl_signal</span><span style="color: #007700">(</span><span style="color: #0000BB">SIGTERM</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">"sig_handler"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">pcntl_signal</span><span style="color: #007700">(</span><span style="color: #0000BB">SIGHUP</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">"sig_handler"</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">//&nbsp;loop&nbsp;forever&nbsp;performing&nbsp;tasks<br /></span><span style="color: #007700">while&nbsp;(</span><span style="color: #0000BB">1</span><span style="color: #007700">)&nbsp;{<br /><br />&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #FF8000">//&nbsp;do&nbsp;something&nbsp;interesting&nbsp;here<br /><br /></span><span style="color: #007700">}<br /><br />function&nbsp;</span><span style="color: #0000BB">sig_handler</span><span style="color: #007700">(</span><span style="color: #0000BB">$signo</span><span style="color: #007700">)&nbsp;<br />{<br /><br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;switch&nbsp;(</span><span style="color: #0000BB">$signo</span><span style="color: #007700">)&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;case&nbsp;</span><span style="color: #0000BB">SIGTERM</span><span style="color: #007700">:<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #FF8000">//&nbsp;handle&nbsp;shutdown&nbsp;tasks<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #007700">exit;<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;break;<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;case&nbsp;</span><span style="color: #0000BB">SIGHUP</span><span style="color: #007700">:<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #FF8000">//&nbsp;handle&nbsp;restart&nbsp;tasks<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #007700">break;<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;default:<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #FF8000">//&nbsp;handle&nbsp;all&nbsp;other&nbsp;signals<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #007700">}<br /><br />}<br /><br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</code></div>
   </div>

  </div>
 </div><?php manual_footer(); ?>
 
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