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| <title>The GNU Fortran Compiler: SIGNAL</title> |
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| <a name="SIGNAL-_002d_002d_002d-Signal-handling-subroutine-_0028or-function_0029"></a> |
| <h3 class="section">8.224 <code>SIGNAL</code> — Signal handling subroutine (or function)</h3> |
| <a name="index-SIGNAL"></a> |
| <a name="index-system_002c-signal-handling"></a> |
| |
| <dl compact="compact"> |
| <dt><em>Description</em>:</dt> |
| <dd><p><code>SIGNAL(NUMBER, HANDLER [, STATUS])</code> causes external subroutine |
| <var>HANDLER</var> to be executed with a single integer argument when signal |
| <var>NUMBER</var> occurs. If <var>HANDLER</var> is an integer, it can be used to |
| turn off handling of signal <var>NUMBER</var> or revert to its default |
| action. See <code>signal(2)</code>. |
| </p> |
| <p>If <code>SIGNAL</code> is called as a subroutine and the <var>STATUS</var> argument |
| is supplied, it is set to the value returned by <code>signal(2)</code>. |
| </p> |
| </dd> |
| <dt><em>Standard</em>:</dt> |
| <dd><p>GNU extension |
| </p> |
| </dd> |
| <dt><em>Class</em>:</dt> |
| <dd><p>Subroutine, function |
| </p> |
| </dd> |
| <dt><em>Syntax</em>:</dt> |
| <dd><table> |
| <tr><td width="80%"><code>CALL SIGNAL(NUMBER, HANDLER [, STATUS])</code></td></tr> |
| <tr><td width="80%"><code>STATUS = SIGNAL(NUMBER, HANDLER)</code></td></tr> |
| </table> |
| |
| </dd> |
| <dt><em>Arguments</em>:</dt> |
| <dd><table> |
| <tr><td width="15%"><var>NUMBER</var></td><td width="70%">Shall be a scalar integer, with <code>INTENT(IN)</code></td></tr> |
| <tr><td width="15%"><var>HANDLER</var></td><td width="70%">Signal handler (<code>INTEGER FUNCTION</code> or |
| <code>SUBROUTINE</code>) or dummy/global <code>INTEGER</code> scalar. |
| <code>INTEGER</code>. It is <code>INTENT(IN)</code>.</td></tr> |
| <tr><td width="15%"><var>STATUS</var></td><td width="70%">(Optional) <var>STATUS</var> shall be a scalar |
| integer. It has <code>INTENT(OUT)</code>.</td></tr> |
| </table> |
| |
| </dd> |
| <dt><em>Return value</em>:</dt> |
| <dd><p>The <code>SIGNAL</code> function returns the value returned by <code>signal(2)</code>. |
| </p> |
| </dd> |
| <dt><em>Example</em>:</dt> |
| <dd><div class="smallexample"> |
| <pre class="smallexample">program test_signal |
| intrinsic signal |
| external handler_print |
| |
| call signal (12, handler_print) |
| call signal (10, 1) |
| |
| call sleep (30) |
| end program test_signal |
| </pre></div> |
| </dd> |
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