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<title>Set an alarm clock for delivery of a signal</title>
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<h1 class="refname">pcntl_alarm</h1>
<p class="verinfo">(PHP 4 >= 4.3.0, PHP 5)</p><p class="refpurpose"><span class="refname">pcntl_alarm</span> — <span class="dc-title">Set an alarm clock for delivery of a signal</span></p>
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<div class="refsect1 description" id="refsect1-function.pcntl-alarm-description">
<h3 class="title">Description</h3>
<div class="methodsynopsis dc-description">
<span class="type">int</span> <span class="methodname"><strong>pcntl_alarm</strong></span>
( <span class="methodparam"><span class="type">int</span> <code class="parameter">$seconds</code></span>
)</div>
<p class="para rdfs-comment">
Creates a timer that will send a <strong><code>SIGALRM</code></strong> signal to
the process after the given number of seconds.
Any call to <span class="function"><strong>pcntl_alarm()</strong></span> will cancel any previously
set alarm.
</p>
</div>
<div class="refsect1 parameters" id="refsect1-function.pcntl-alarm-parameters">
<h3 class="title">Parameters</h3>
<p class="para">
<dl>
<dt>
<span class="term"><em><code class="parameter">seconds</code></em></span>
<dd>
<p class="para">
The number of seconds to wait. If <em><code class="parameter">seconds</code></em> is
zero, no new alarm is created.
</p>
</dd>
</dt>
</dl>
</p>
</div>
<div class="refsect1 returnvalues" id="refsect1-function.pcntl-alarm-returnvalues">
<h3 class="title">Return Values</h3>
<p class="para">
Returns the time in seconds that any previously scheduled alarm had
remaining before it was to be delivered, or <em>0</em> if there
was no previously scheduled alarm.
</p>
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