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| <h3 class="section">8.224 <code>SIGNAL</code> — Signal handling subroutine (or function)</h3> |
| |
| <p><a name="index-SIGNAL-1032"></a><a name="index-system_002c-signal-handling-1033"></a> |
| <dl> |
| <dt><em>Description</em>:<dd><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>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>. |
| |
| <br><dt><em>Standard</em>:<dd>GNU extension |
| |
| <br><dt><em>Class</em>:<dd>Subroutine, function |
| |
| <br><dt><em>Syntax</em>:<dd> |
| <p><table summary=""><tr align="left"><td valign="top" width="80%"><code>CALL SIGNAL(NUMBER, HANDLER [, STATUS])</code> |
| <br></td></tr><tr align="left"><td valign="top" width="80%"><code>STATUS = SIGNAL(NUMBER, HANDLER)</code> |
| <br></td></tr></table> |
| |
| <br><dt><em>Arguments</em>:<dd> |
| <p><table summary=""><tr align="left"><td valign="top" width="15%"><var>NUMBER</var> </td><td valign="top" width="70%">Shall be a scalar integer, with <code>INTENT(IN)</code> |
| <br></td></tr><tr align="left"><td valign="top" width="15%"><var>HANDLER</var></td><td valign="top" 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>. |
| <br></td></tr><tr align="left"><td valign="top" width="15%"><var>STATUS</var> </td><td valign="top" width="70%">(Optional) <var>STATUS</var> shall be a scalar |
| integer. It has <code>INTENT(OUT)</code>. |
| <br></td></tr></table> |
| <!-- TODO: What should the interface of the handler be? Does it take arguments? --> |
| |
| <br><dt><em>Return value</em>:<dd>The <code>SIGNAL</code> function returns the value returned by <code>signal(2)</code>. |
| |
| <br><dt><em>Example</em>:<dd> |
| <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> |
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