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<a name="raise_002d_002d_002dsend-a-signal"></a>
<h3 class="section">7.2 <code>raise</code>&mdash;send a signal</h3>
<a name="index-raise"></a>
<a name="index-_005fraise_005fr"></a>
<p><strong>Synopsis</strong>
</p><div class="example">
<pre class="example">#include &lt;signal.h&gt;
int raise(int <var>sig</var>);

int _raise_r(void *<var>reent</var>, int <var>sig</var>);

</pre></div>
<p><strong>Description</strong><br>
Send the signal <var>sig</var> (one of the macros from &lsquo;<code>sys/signal.h</code>&rsquo;).
This interrupts your program&rsquo;s normal flow of execution, and allows a signal
handler (if you&rsquo;ve defined one, using <code>signal</code>) to take control.
</p>
<p>The alternate function <code>_raise_r</code> is a reentrant version.  The extra
argument <var>reent</var> is a pointer to a reentrancy structure.
</p>
<br>
<p><strong>Returns</strong><br>
The result is <code>0</code> if <var>sig</var> was successfully raised, <code>1</code>
otherwise.  However, the return value (since it depends on the normal
flow of execution) may not be visible, unless the signal handler for
<var>sig</var> terminates with a <code>return</code> or unless <code>SIG_IGN</code> is in
effect for this signal.
</p>
<br>
<p><strong>Portability</strong><br>
ANSI C requires <code>raise</code>, but allows the full set of signal numbers
to vary from one implementation to another.
</p>
<p>Required OS subroutines: <code>getpid</code>, <code>kill</code>.
</p>
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