153 lines
5.7 KiB
HTML
153 lines
5.7 KiB
HTML
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<title>sigsuspend</title>
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<script type="text/javascript" language="JavaScript" src="../jscript/codes.js">
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<basefont size="3"> <a name="sigsuspend"></a> <a name="tag_03_698"></a><!-- sigsuspend -->
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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_698_01"></a>NAME</h4>
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<blockquote>sigsuspend - wait for a signal</blockquote>
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<h4><a name="tag_03_698_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 sigsuspend(const sigset_t *</tt><i>sigmask</i><tt>); <img src="../images/opt-end.gif" alt="[Option End]" border=
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"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_698_03"></a>DESCRIPTION</h4>
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<blockquote>
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<p>The <i>sigsuspend</i>() function shall replace the current signal mask of the calling thread with the set of signals pointed to
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by <i>sigmask</i> and then suspend the thread until delivery of a signal whose action is either to execute a signal-catching
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function or to terminate the process. This shall not cause any other signals that may have been pending on the process to become
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pending on the thread.</p>
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<p>If the action is to terminate the process then <i>sigsuspend</i>() shall never return. If the action is to execute a
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signal-catching function, then <i>sigsuspend</i>() shall return after the signal-catching function returns, with the signal mask
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restored to the set that existed prior to the <i>sigsuspend</i>() call.</p>
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<p>It is not possible to block signals that cannot be ignored. This is enforced by the system without causing an error to be
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indicated.</p>
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</blockquote>
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<h4><a name="tag_03_698_04"></a>RETURN VALUE</h4>
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<blockquote>
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<p>Since <i>sigsuspend</i>() suspends thread execution indefinitely, there is no successful completion return value. If a return
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occurs, -1 shall be returned and <i>errno</i> set to indicate the error.</p>
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</blockquote>
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<h4><a name="tag_03_698_05"></a>ERRORS</h4>
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<blockquote>
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<p>The <i>sigsuspend</i>() function shall fail if:</p>
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<dl compact>
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<dt>[EINTR]</dt>
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<dd>A signal is caught by the calling process and control is returned from the signal-catching function.</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_698_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_698_07"></a>APPLICATION USAGE</h4>
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<blockquote>
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<p>Normally, at the beginning of a critical code section, a specified set of signals is blocked using the <a href=
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"../functions/sigprocmask.html"><i>sigprocmask</i>()</a> function. When the thread has completed the critical section and needs to
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wait for the previously blocked signal(s), it pauses by calling <i>sigsuspend</i>() with the mask that was returned by the <a href=
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"../functions/sigprocmask.html"><i>sigprocmask</i>()</a> call.</p>
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</blockquote>
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<h4><a name="tag_03_698_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_698_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_698_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="pause.html"><i>pause</i>()</a> , <a href=
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"sigaction.html"><i>sigaction</i>()</a> , <a href="sigaddset.html"><i>sigaddset</i>()</a> , <a href=
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"sigdelset.html"><i>sigdelset</i>()</a> , <a href="sigemptyset.html"><i>sigemptyset</i>()</a> , <a href=
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"sigfillset.html"><i>sigfillset</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_698_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_698_12"></a>Issue 5</h4>
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<blockquote>
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<p>The DESCRIPTION is updated for alignment with the POSIX Threads Extension.</p>
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</blockquote>
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<h4><a name="tag_03_698_13"></a>Issue 6</h4>
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<blockquote>
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<p>The text in the RETURN VALUE section has been changed from "suspends process execution" to "suspends thread execution". This
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reflects IEEE PASC Interpretation 1003.1c #40.</p>
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<p>Text in the APPLICATION USAGE section has been replaced.</p>
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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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