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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>pause</title></head><body bgcolor="white"><basefont size="3"> <a name="pause"></a> <a name="tag_03_415"></a><!-- pause --> <!--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_415_01"></a>NAME</h4><blockquote>pause - suspend the thread until a signal is received</blockquote><h4><a name="tag_03_415_02"></a>SYNOPSIS</h4><blockquote class="synopsis"><p><code><tt>#include <<a href="../basedefs/unistd.h.html">unistd.h</a>><br><br> int pause(void);<br></tt></code></p></blockquote><h4><a name="tag_03_415_03"></a>DESCRIPTION</h4><blockquote><p>The <i>pause</i>() function shall suspend the calling thread until delivery of a signal whose action is either to execute asignal-catching function or to terminate the process.</p><p>If the action is to terminate the process, <i>pause</i>() shall not return.</p><p>If the action is to execute a signal-catching function, <i>pause</i>() shall return after the signal-catching functionreturns.</p></blockquote><h4><a name="tag_03_415_04"></a>RETURN VALUE</h4><blockquote><p>Since <i>pause</i>() suspends thread execution indefinitely unless interrupted by a signal, there is no successful completionreturn value. A value of -1 shall be returned and <i>errno</i> set to indicate the error.</p></blockquote><h4><a name="tag_03_415_05"></a>ERRORS</h4><blockquote><p>The <i>pause</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_415_06"></a>EXAMPLES</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_415_07"></a>APPLICATION USAGE</h4><blockquote><p>Many common uses of <i>pause</i>() have timing windows. The scenario involves checking a condition related to a signal and, ifthe signal has not occurred, calling <i>pause</i>(). When the signal occurs between the check and the call to <i>pause</i>(), theprocess often blocks indefinitely. The <a href="../functions/sigprocmask.html"><i>sigprocmask</i>()</a> and <a href="../functions/sigsuspend.html"><i>sigsuspend</i>()</a> functions can be used to avoid this type of problem.</p></blockquote><h4><a name="tag_03_415_08"></a>RATIONALE</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_415_09"></a>FUTURE DIRECTIONS</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_415_10"></a>SEE ALSO</h4><blockquote><p><a href="sigsuspend.html"><i>sigsuspend</i>()</a>, the Base Definitions volume of IEEE Std 1003.1-2001, <a href="../basedefs/unistd.h.html"><i><unistd.h></i></a></p></blockquote><h4><a name="tag_03_415_11"></a>CHANGE HISTORY</h4><blockquote><p>First released in Issue 1. Derived from Issue 1 of the SVID.</p></blockquote><h4><a name="tag_03_415_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_415_13"></a>Issue 6</h4><blockquote><p>The APPLICATION USAGE section is added.</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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