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| <h3 class="section">24.10 BSD Signal Handling</h3> |
| |
| <p>This section describes alternative signal handling functions derived |
| from BSD Unix. These facilities were an advance, in their time; today, |
| they are mostly obsolete, and supported mainly for compatibility with |
| BSD Unix. |
| |
| <p>There are many similarities between the BSD and POSIX signal handling |
| facilities, because the POSIX facilities were inspired by the BSD |
| facilities. Besides having different names for all the functions to |
| avoid conflicts, the main differences between the two are: |
| |
| <ul> |
| <li>BSD Unix represents signal masks as an <code>int</code> bit mask, rather than |
| as a <code>sigset_t</code> object. |
| |
| <li>The BSD facilities use a different default for whether an interrupted |
| primitive should fail or resume. The POSIX facilities make system |
| calls fail unless you specify that they should resume. With the BSD |
| facility, the default is to make system calls resume unless you say they |
| should fail. See <a href="Interrupted-Primitives.html#Interrupted-Primitives">Interrupted Primitives</a>. |
| </ul> |
| |
| <p>The BSD facilities are declared in <samp><span class="file">signal.h</span></samp>. |
| <a name="index-signal_002eh-2991"></a> |
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| <li><a accesskey="1" href="BSD-Handler.html#BSD-Handler">BSD Handler</a>: BSD Function to Establish a Handler. |
| <li><a accesskey="2" href="Blocking-in-BSD.html#Blocking-in-BSD">Blocking in BSD</a>: BSD Functions for Blocking Signals. |
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