pcntl.examples.html

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html> <head>  <title>Examples</title>  <meta http-equiv="content-type" content="text/html; charset=UTF-8"> </head> <body><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="pcntl.constants.html">Predefined Constants</a></div> <div class="next" style="text-align: right; float: right;"><a href="ref.pcntl.html">PCNTL Functions</a></div> <div class="up"><a href="book.pcntl.html">PCNTL</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div> <h1>Examples</h1> <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"><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></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="pcntl.constants.html">Predefined Constants</a></div> <div class="next" style="text-align: right; float: right;"><a href="ref.pcntl.html">PCNTL Functions</a></div> <div class="up"><a href="book.pcntl.html">PCNTL</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div></body></html>

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