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| <h3 class="section">24.2 Standard Signals</h3> |
| |
| <p><a name="index-signal-names-2819"></a><a name="index-names-of-signals-2820"></a> |
| <a name="index-signal_002eh-2821"></a><a name="index-signal-number-2822"></a>This section lists the names for various standard kinds of signals and |
| describes what kind of event they mean. Each signal name is a macro |
| which stands for a positive integer—the <dfn>signal number</dfn> for that |
| kind of signal. Your programs should never make assumptions about the |
| numeric code for a particular kind of signal, but rather refer to them |
| always by the names defined here. This is because the number for a |
| given kind of signal can vary from system to system, but the meanings of |
| the names are standardized and fairly uniform. |
| |
| <p>The signal names are defined in the header file <samp><span class="file">signal.h</span></samp>. |
| |
| <!-- signal.h --> |
| <!-- BSD --> |
| <div class="defun"> |
| — Macro: int <b>NSIG</b><var><a name="index-NSIG-2823"></a></var><br> |
| <blockquote><p>The value of this symbolic constant is the total number of signals |
| defined. Since the signal numbers are allocated consecutively, |
| <code>NSIG</code> is also one greater than the largest defined signal number. |
| </p></blockquote></div> |
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| <ul class="menu"> |
| <li><a accesskey="1" href="Program-Error-Signals.html#Program-Error-Signals">Program Error Signals</a>: Used to report serious program errors. |
| <li><a accesskey="2" href="Termination-Signals.html#Termination-Signals">Termination Signals</a>: Used to interrupt and/or terminate the |
| program. |
| <li><a accesskey="3" href="Alarm-Signals.html#Alarm-Signals">Alarm Signals</a>: Used to indicate expiration of timers. |
| <li><a accesskey="4" href="Asynchronous-I_002fO-Signals.html#Asynchronous-I_002fO-Signals">Asynchronous I/O Signals</a>: Used to indicate input is available. |
| <li><a accesskey="5" href="Job-Control-Signals.html#Job-Control-Signals">Job Control Signals</a>: Signals used to support job control. |
| <li><a accesskey="6" href="Operation-Error-Signals.html#Operation-Error-Signals">Operation Error Signals</a>: Used to report operational system errors. |
| <li><a accesskey="7" href="Miscellaneous-Signals.html#Miscellaneous-Signals">Miscellaneous Signals</a>: Miscellaneous Signals. |
| <li><a accesskey="8" href="Signal-Messages.html#Signal-Messages">Signal Messages</a>: Printing a message describing a signal. |
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