📄 sigsuspend.html
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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) 2001-2003 The Open Group, All Rights Reserved --><title>sigsuspend</title></head><body bgcolor="white"><script type="text/javascript" language="JavaScript" src="../jscript/codes.js"></script><basefont size="3"> <a name="sigsuspend"></a> <a name="tag_03_698"></a><!-- sigsuspend --> <!--header start--><center><font size="2">The Open Group Base Specifications Issue 6<br>IEEE Std 1003.1, 2003 Edition<br>Copyright © 2001-2003 The IEEE and The Open Group, All Rights reserved.</font></center><!--header end--><hr size="2" noshade><h4><a name="tag_03_698_01"></a>NAME</h4><blockquote>sigsuspend - wait for a signal</blockquote><h4><a name="tag_03_698_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 sigsuspend(const sigset_t *</tt><i>sigmask</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_698_03"></a>DESCRIPTION</h4><blockquote><p>The <i>sigsuspend</i>() function shall replace the current signal mask of the calling thread with the set of signals pointed toby <i>sigmask</i> and then suspend the thread until delivery of a signal whose action is either to execute a signal-catchingfunction or to terminate the process. This shall not cause any other signals that may have been pending on the process to becomepending on the thread.</p><p>If the action is to terminate the process then <i>sigsuspend</i>() shall never return. If the action is to execute asignal-catching function, then <i>sigsuspend</i>() shall return after the signal-catching function returns, with the signal maskrestored to the set that existed prior to the <i>sigsuspend</i>() call.</p><p>It is not possible to block signals that cannot be ignored. This is enforced by the system without causing an error to beindicated.</p></blockquote><h4><a name="tag_03_698_04"></a>RETURN VALUE</h4><blockquote><p>Since <i>sigsuspend</i>() suspends thread execution indefinitely, there is no successful completion return value. If a returnoccurs, -1 shall be returned and <i>errno</i> set to indicate the error.</p></blockquote><h4><a name="tag_03_698_05"></a>ERRORS</h4><blockquote><p>The <i>sigsuspend</i>() function shall fail if:</p><dl compact><dt>[EINTR]</dt><dd>A signal is caught by the calling process and control is returned from the signal-catching function.</dd></dl></blockquote><hr><div class="box"><em>The following sections are informative.</em></div><h4><a name="tag_03_698_06"></a>EXAMPLES</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_698_07"></a>APPLICATION USAGE</h4><blockquote><p>Normally, at the beginning of a critical code section, a specified set of signals is blocked using the <a href="../functions/sigprocmask.html"><i>sigprocmask</i>()</a> function. When the thread has completed the critical section and needs towait for the previously blocked signal(s), it pauses by calling <i>sigsuspend</i>() with the mask that was returned by the <a href="../functions/sigprocmask.html"><i>sigprocmask</i>()</a> call.</p></blockquote><h4><a name="tag_03_698_08"></a>RATIONALE</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_698_09"></a>FUTURE DIRECTIONS</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_698_10"></a>SEE ALSO</h4><blockquote><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="sigaction.html"><i>sigaction</i>()</a> , <a href="sigaddset.html"><i>sigaddset</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> , 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_698_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_698_12"></a>Issue 5</h4><blockquote><p>The DESCRIPTION is updated for alignment with the POSIX Threads Extension.</p></blockquote><h4><a name="tag_03_698_13"></a>Issue 6</h4><blockquote><p>The text in the RETURN VALUE section has been changed from "suspends process execution" to "suspends thread execution". Thisreflects IEEE PASC Interpretation 1003.1c #40.</p><p>Text in the APPLICATION USAGE section has been replaced.</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><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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