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<title>The GNU Fortran Compiler: SIGNAL</title>
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<a name="SIGNAL"></a>
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<p>
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Next: <a href="SIN.html#SIN" accesskey="n" rel="next">SIN</a>, Previous: <a href="SIGN.html#SIGN" accesskey="p" rel="prev">SIGN</a>, Up: <a href="Intrinsic-Procedures.html#Intrinsic-Procedures" accesskey="u" rel="up">Intrinsic Procedures</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
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<hr>
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<a name="SIGNAL-_002d_002d_002d-Signal-handling-subroutine-_0028or-function_0029"></a>
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<h3 class="section">9.239 <code>SIGNAL</code> — Signal handling subroutine (or function)</h3>
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<a name="index-SIGNAL"></a>
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<a name="index-system_002c-signal-handling"></a>
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<dl compact="compact">
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<dt><em>Description</em>:</dt>
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<dd><p><code>SIGNAL(NUMBER, HANDLER [, STATUS])</code> causes external subroutine
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<var>HANDLER</var> to be executed with a single integer argument when signal
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<var>NUMBER</var> occurs. If <var>HANDLER</var> is an integer, it can be used to
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turn off handling of signal <var>NUMBER</var> or revert to its default
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action. See <code>signal(2)</code>.
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</p>
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<p>If <code>SIGNAL</code> is called as a subroutine and the <var>STATUS</var> argument
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is supplied, it is set to the value returned by <code>signal(2)</code>.
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</p>
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</dd>
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<dt><em>Standard</em>:</dt>
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<dd><p>GNU extension
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</p>
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</dd>
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<dt><em>Class</em>:</dt>
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<dd><p>Subroutine, function
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</p>
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</dd>
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<dt><em>Syntax</em>:</dt>
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<dd><table>
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<tr><td width="80%"><code>CALL SIGNAL(NUMBER, HANDLER [, STATUS])</code></td></tr>
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<tr><td width="80%"><code>STATUS = SIGNAL(NUMBER, HANDLER)</code></td></tr>
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</table>
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</dd>
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<dt><em>Arguments</em>:</dt>
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<dd><table>
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<tr><td width="15%"><var>NUMBER</var></td><td width="70%">Shall be a scalar integer, with <code>INTENT(IN)</code></td></tr>
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<tr><td width="15%"><var>HANDLER</var></td><td width="70%">Signal handler (<code>INTEGER FUNCTION</code> or
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<code>SUBROUTINE</code>) or dummy/global <code>INTEGER</code> scalar.
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<code>INTEGER</code>. It is <code>INTENT(IN)</code>.</td></tr>
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<tr><td width="15%"><var>STATUS</var></td><td width="70%">(Optional) <var>STATUS</var> shall be a scalar
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integer. It has <code>INTENT(OUT)</code>.</td></tr>
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</table>
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</dd>
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<dt><em>Return value</em>:</dt>
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<dd><p>The <code>SIGNAL</code> function returns the value returned by <code>signal(2)</code>.
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</p>
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</dd>
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<dt><em>Example</em>:</dt>
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<dd><div class="smallexample">
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<pre class="smallexample">program test_signal
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intrinsic signal
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external handler_print
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call signal (12, handler_print)
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call signal (10, 1)
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call sleep (30)
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end program test_signal
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</pre></div>
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</dd>
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