examples.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<chapter xml:id="pcntl.examples" xmlns="http://docbook.org/ns/docbook">
 &reftitle.examples;
 <section xml:id="pcntl.example">
  <title>Basic usage</title>
  <para>
   This example forks off a daemon process with a signal handler.
  </para>
  <example>
   <title>Process Control Example</title>
   <programlisting role="php">
<![CDATA[
<?php
pcntl_async_signals(true);

$pid = pcntl_fork();
if ($pid == -1) {
     die("could not fork"); 
} else if ($pid) {
     exit(); // we are the parent 
} else {
     // we are the child
}

// detach from the controlling terminal
if (posix_setsid() == -1) {
    die("could not detach from terminal");
}

// setup signal handlers
pcntl_signal(SIGTERM, "sig_handler");
pcntl_signal(SIGHUP, "sig_handler");

// loop forever performing tasks
while (1) {

    // do something interesting here

}

function sig_handler($signo) 
{

     switch ($signo) {
         case SIGTERM:
             // handle shutdown tasks
             exit;
             break;
         case SIGHUP:
             // handle restart tasks
             break;
         default:
             // handle all other signals
     }

}

?>
]]>
   </programlisting>
  </example>
 </section>
</chapter>

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