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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><meta name="generator" content="HTML Tidy, see www.w3.org"><meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"><link type="text/css" rel="stylesheet" href="style.css"><!-- Generated by The Open Group's rhtm tool v1.2.1 --><!-- Copyright (c) 2001-2004 IEEE and The Open Group, All Rights Reserved --><title>sigaddset</title></head><body bgcolor="white"><script type="text/javascript" language="JavaScript" src="../jscript/codes.js"></script><basefont size="3"> <a name="sigaddset"></a> <a name="tag_03_681"></a><!-- sigaddset --> <!--header start--><center><font size="2">The Open Group Base Specifications Issue 6<br>IEEE Std 1003.1, 2004 Edition<br>Copyright © 2001-2004 The IEEE and The Open Group, All Rights reserved.</font></center><!--header end--><hr size="2" noshade><h4><a name="tag_03_681_01"></a>NAME</h4><blockquote>sigaddset - add a signal to a signal set</blockquote><h4><a name="tag_03_681_02"></a>SYNOPSIS</h4><blockquote class="synopsis"><div class="box"><code><tt><sup>[<a href="javascript:open_code('CX')">CX</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]" border="0"> #include <<a href="../basedefs/signal.h.html">signal.h</a>><br><br> int sigaddset(sigset_t *</tt><i>set</i><tt>, int</tt> <i>signo</i><tt>); <img src="../images/opt-end.gif" alt="[Option End]"border="0"></tt></code></div><tt><br></tt></blockquote><h4><a name="tag_03_681_03"></a>DESCRIPTION</h4><blockquote><p>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><p>Applications shall call either <a href="../functions/sigemptyset.html"><i>sigemptyset</i>()</a> or <a href="../functions/sigfillset.html"><i>sigfillset</i>()</a> at least once for each object of type <b>sigset_t</b> prior to any other useof that object. If such an object is not initialized in this way, but is nonetheless supplied as an argument to any of <a href="../functions/pthread_sigmask.html"><i>pthread_sigmask</i>()</a>, <a href="../functions/sigaction.html"><i>sigaction</i>()</a>,<i>sigaddset</i>(), <a href="../functions/sigdelset.html"><i>sigdelset</i>()</a>, <a href="../functions/sigismember.html"><i>sigismember</i>()</a>, <a href="../functions/sigpending.html"><i>sigpending</i>()</a>, <a href="../functions/sigprocmask.html"><i>sigprocmask</i>()</a>, <a href="../functions/sigsuspend.html"><i>sigsuspend</i>()</a>, <a href="../functions/sigtimedwait.html"><i>sigtimedwait</i>()</a>, <a href="../functions/sigwait.html"><i>sigwait</i>()</a>, or <a href="../functions/sigwaitinfo.html"><i>sigwaitinfo</i>()</a>, the results are undefined.</p></blockquote><h4><a name="tag_03_681_04"></a>RETURN VALUE</h4><blockquote><p>Upon successful completion, <i>sigaddset</i>() shall return 0; otherwise, it shall return -1 and set <i>errno</i> to indicatethe error.</p></blockquote><h4><a name="tag_03_681_05"></a>ERRORS</h4><blockquote><p>The <i>sigaddset</i>() function may fail if:</p><dl compact><dt>[EINVAL]</dt><dd>The value of the <i>signo</i> argument is an invalid or unsupported signal number.</dd></dl></blockquote><hr><div class="box"><em>The following sections are informative.</em></div><h4><a name="tag_03_681_06"></a>EXAMPLES</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_681_07"></a>APPLICATION USAGE</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_681_08"></a>RATIONALE</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_681_09"></a>FUTURE DIRECTIONS</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_681_10"></a>SEE ALSO</h4><blockquote><p><a href="xsh_chap02_04.html#tag_02_04"><i>Signal Concepts</i></a>, <a href="sigaction.html"><i>sigaction</i>()</a>, <a href="sigdelset.html"><i>sigdelset</i>()</a>, <a href="sigemptyset.html"><i>sigemptyset</i>()</a>, <a href="sigfillset.html"><i>sigfillset</i>()</a>, <a href="sigismember.html"><i>sigismember</i>()</a>, <a href="sigpending.html"><i>sigpending</i>()</a>, <a href="sigprocmask.html"><i>sigprocmask</i>()</a>, <a href="sigsuspend.html"><i>sigsuspend</i>()</a>, the Base Definitions volume of IEEE Std 1003.1-2001, <a href="../basedefs/signal.h.html"><i><signal.h></i></a></p></blockquote><h4><a name="tag_03_681_11"></a>CHANGE HISTORY</h4><blockquote><p>First released in Issue 3. Included for alignment with the POSIX.1-1988 standard.</p></blockquote><h4><a name="tag_03_681_12"></a>Issue 5</h4><blockquote><p>The last paragraph of the DESCRIPTION was included as an APPLICATION USAGE note in previous issues.</p></blockquote><h4><a name="tag_03_681_13"></a>Issue 6</h4><blockquote><p>The DESCRIPTION is updated to avoid use of the term "must" for application requirements.</p><p>The SYNOPSIS is marked CX since the presence of this function in the <a href="../basedefs/signal.h.html"><i><signal.h></i></a> header is an extension over the ISO C standard.</p></blockquote><div class="box"><em>End of informative text.</em></div><hr size="2" noshade><center><font size="2"><!--footer start-->UNIX ® is a registered Trademark of The Open Group.<br>POSIX ® is a registered Trademark of The IEEE.<br>[ <a href="../mindex.html">Main Index</a> | <a href="../basedefs/contents.html">XBD</a> | <a href="../utilities/contents.html">XCU</a> | <a href="../functions/contents.html">XSH</a> | <a href="../xrat/contents.html">XRAT</a>]</font></center><!--footer end--><hr size="2" noshade></body></html>⌨️ 快捷键说明
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