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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"><html><head><!-- Copyright 1997 The Open Group, All Rights Reserved --><title>sigaddset</title></head><body bgcolor=white><center><font size=2>The Single UNIX ® Specification, Version 2<br>Copyright © 1997 The Open Group</font></center><hr size=2 noshade><h4><a name = "tag_000_008_588"> </a>NAME</h4><blockquote>sigaddset - add a signal to a signal set</blockquote><h4><a name = "tag_000_008_589"> </a>SYNOPSIS</h4><blockquote><pre><code>#include <<a href="signal.h.html">signal.h</a>>int sigaddset(sigset_t *<i>set</i>, int <i>signo</i>);</code></pre></blockquote><h4><a name = "tag_000_008_590"> </a>DESCRIPTION</h4><blockquote>The<i>sigaddset()</i>function adds the individual signal specified by the<i>signo</i> to the signal set pointed to by <i>set</i>.<p>Applications must call either<i><a href="sigemptyset.html">sigemptyset()</a></i>or<i><a href="sigfillset.html">sigfillset()</a></i>at least once for each object of type<b>sigset_t</b>prior to any other use of that object.If such an object is not initialised in this way, but isnonetheless supplied as an argument to any of<i><a href="sigaction.html">sigaction()</a></i>,<i>sigaddset()</i>,<i><a href="sigdelset.html">sigdelset()</a></i>,<i><a href="sigismember.html">sigismember()</a></i>,<i><a href="sigpending.html">sigpending()</a></i>or<i><a href="sigprocmask.html">sigprocmask()</a></i>,the results are undefined.</blockquote><h4><a name = "tag_000_008_591"> </a>RETURN VALUE</h4><blockquote>Upon successful completion,<i>sigaddset()</i>returns 0. Otherwise, it returns -1 and sets<i>errno</i>to indicate the error.</blockquote><h4><a name = "tag_000_008_592"> </a>ERRORS</h4><blockquote>The<i>sigaddset()</i>function may fail if:<dl compact><dt>[EINVAL]<dd>The value of the<i>signo</i>argument is an invalid or unsupported signal number.</dl></blockquote><h4><a name = "tag_000_008_593"> </a>EXAMPLES</h4><blockquote>None.</blockquote><h4><a name = "tag_000_008_594"> </a>APPLICATION USAGE</h4><blockquote>None.</blockquote><h4><a name = "tag_000_008_595"> </a>FUTURE DIRECTIONS</h4><blockquote>None.</blockquote><h4><a name = "tag_000_008_596"> </a>SEE ALSO</h4><blockquote><i><a href="sigaction.html">sigaction()</a></i>,<i><a href="sigdelset.html">sigdelset()</a></i>,<i><a href="sigemptyset.html">sigemptyset()</a></i>,<i><a href="sigfillset.html">sigfillset()</a></i>,<i><a href="sigismember.html">sigismember()</a></i>,<i><a href="sigpending.html">sigpending()</a></i>,<i><a href="sigprocmask.html">sigprocmask()</a></i>,<i><a href="sigsuspend.html">sigsuspend()</a></i>,<i><a href="signal.h.html"><signal.h></a></i>.</blockquote><h4>DERIVATION</h4><blockquote>Derived from the POSIX.1-1988 standard.</blockquote><hr size=2 noshade><center><font size=2>UNIX ® is a registered Trademark of The Open Group.<br>Copyright © 1997 The Open Group<br> [ <a href="../index.html">Main Index</a> | <a href="../xshix.html">XSH</a> | <a href="../xcuix.html">XCU</a> | <a href="../xbdix.html">XBD</a> | <a href="../cursesix.html">XCURSES</a> | <a href="../xnsix.html">XNS</a> ]</font></center><hr size=2 noshade></body></html>⌨️ 快捷键说明
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