147 lines
5.5 KiB
HTML
147 lines
5.5 KiB
HTML
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<!-- Copyright (c) 2001 The Open Group, All Rights Reserved -->
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<title>sigismember</title>
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<basefont size="3"> <a name="sigismember"></a> <a name="tag_03_688"></a><!-- sigismember -->
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<!--header start-->
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<center><font size="2">The Open Group Base Specifications Issue 6<br>
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IEEE Std 1003.1-2001<br>
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Copyright © 2001 The IEEE and The Open Group, All Rights reserved.</font></center>
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<!--header end-->
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<hr size="2" noshade>
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<h4><a name="tag_03_688_01"></a>NAME</h4>
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<blockquote>sigismember - test for a signal in a signal set</blockquote>
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<h4><a name="tag_03_688_02"></a>SYNOPSIS</h4>
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<blockquote class="synopsis">
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<div class="box"><code><tt><sup>[<a href="javascript:open_code('CX')">CX</a>]</sup> <img src="../images/opt-start.gif" alt=
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"[Option Start]" border="0"> #include <<a href="../basedefs/signal.h.html">signal.h</a>><br>
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<br>
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int sigismember(const sigset_t *</tt><i>set</i><tt>, int</tt> <i>signo</i><tt>); <img src="../images/opt-end.gif" alt=
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"[Option End]" border="0"></tt></code></div>
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<tt><br>
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</tt></blockquote>
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<h4><a name="tag_03_688_03"></a>DESCRIPTION</h4>
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<blockquote>
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<p>The <i>sigismember</i>() function shall test whether the signal specified by <i>signo</i> is a member of the set pointed to by
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<i>set</i>.</p>
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<p>Applications should call either <a href="../functions/sigemptyset.html"><i>sigemptyset</i>()</a> or <a href=
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"../functions/sigfillset.html"><i>sigfillset</i>()</a> at least once for each object of type <b>sigset_t</b> prior to any other use
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of that object. If such an object is not initialized in this way, but is nonetheless supplied as an argument to any of <a href=
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"../functions/pthread_sigmask.html"><i>pthread_sigmask</i>()</a>, <a href="../functions/sigaction.html"><i>sigaction</i>()</a>, <a
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href="../functions/sigaddset.html"><i>sigaddset</i>()</a>, <a href="../functions/sigdelset.html"><i>sigdelset</i>()</a>,
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<i>sigismember</i>(), <a href="../functions/sigpending.html"><i>sigpending</i>()</a>, <a href=
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"../functions/sigprocmask.html"><i>sigprocmask</i>()</a>, <a href="../functions/sigsuspend.html"><i>sigsuspend</i>()</a>, <a href=
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"../functions/sigtimedwait.html"><i>sigtimedwait</i>()</a>, <a href="../functions/sigwait.html"><i>sigwait</i>()</a>, or <a href=
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"../functions/sigwaitinfo.html"><i>sigwaitinfo</i>()</a>, the results are undefined.</p>
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</blockquote>
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<h4><a name="tag_03_688_04"></a>RETURN VALUE</h4>
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<blockquote>
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<p>Upon successful completion, <i>sigismember</i>() shall return 1 if the specified signal is a member of the specified set, or 0
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if it is not. Otherwise, it shall return -1 and set <i>errno</i> to indicate the error.</p>
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</blockquote>
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<h4><a name="tag_03_688_05"></a>ERRORS</h4>
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<blockquote>
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<p>The <i>sigismember</i>() function may fail if:</p>
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<dl compact>
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<dt>[EINVAL]</dt>
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<dd>The <i>signo</i> argument is not a valid signal number, or is an unsupported signal number.</dd>
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</dl>
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</blockquote>
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<hr>
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<div class="box"><em>The following sections are informative.</em></div>
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<h4><a name="tag_03_688_06"></a>EXAMPLES</h4>
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<blockquote>
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<p>None.</p>
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</blockquote>
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<h4><a name="tag_03_688_07"></a>APPLICATION USAGE</h4>
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<blockquote>
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<p>None.</p>
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</blockquote>
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<h4><a name="tag_03_688_08"></a>RATIONALE</h4>
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<blockquote>
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<p>None.</p>
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</blockquote>
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<h4><a name="tag_03_688_09"></a>FUTURE DIRECTIONS</h4>
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<blockquote>
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<p>None.</p>
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</blockquote>
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<h4><a name="tag_03_688_10"></a>SEE ALSO</h4>
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<blockquote>
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<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=
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"sigaddset.html"><i>sigaddset</i>()</a> , <a href="sigdelset.html"><i>sigdelset</i>()</a> , <a href=
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"sigfillset.html"><i>sigfillset</i>()</a> , <a href="sigemptyset.html"><i>sigemptyset</i>()</a> , <a href=
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"sigpending.html"><i>sigpending</i>()</a> , <a href="sigprocmask.html"><i>sigprocmask</i>()</a> , <a href=
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"sigsuspend.html"><i>sigsuspend</i>()</a> , the Base Definitions volume of IEEE Std 1003.1-2001, <a href=
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"../basedefs/signal.h.html"><i><signal.h></i></a></p>
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</blockquote>
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<h4><a name="tag_03_688_11"></a>CHANGE HISTORY</h4>
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<blockquote>
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<p>First released in Issue 3. Included for alignment with the POSIX.1-1988 standard.</p>
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</blockquote>
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<h4><a name="tag_03_688_12"></a>Issue 5</h4>
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<blockquote>
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<p>The last paragraph of the DESCRIPTION was included as an APPLICATION USAGE note in previous issues.</p>
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</blockquote>
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<h4><a name="tag_03_688_13"></a>Issue 6</h4>
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<blockquote>
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<p>The SYNOPSIS is marked CX since the presence of this function in the <a href=
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"../basedefs/signal.h.html"><i><signal.h></i></a> header is an extension over the ISO C standard.</p>
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</blockquote>
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<div class="box"><em>End of informative text.</em></div>
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