135 lines
4.2 KiB
HTML
135 lines
4.2 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<html>
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<meta name="generator" content="HTML Tidy, see www.w3.org">
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<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
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<link type="text/css" rel="stylesheet" href="style.css"><!-- Generated by The Open Group's rhtm tool v1.2.1 -->
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<!-- Copyright (c) 2001 The Open Group, All Rights Reserved -->
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<title>pause</title>
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</head>
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<body bgcolor="white">
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<basefont size="3"> <a name="pause"></a> <a name="tag_03_415"></a><!-- pause -->
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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_415_01"></a>NAME</h4>
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<blockquote>pause - suspend the thread until a signal is received</blockquote>
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<h4><a name="tag_03_415_02"></a>SYNOPSIS</h4>
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<blockquote class="synopsis">
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<p><code><tt>#include <<a href="../basedefs/unistd.h.html">unistd.h</a>><br>
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<br>
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int pause(void);<br>
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</tt></code></p>
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</blockquote>
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<h4><a name="tag_03_415_03"></a>DESCRIPTION</h4>
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<blockquote>
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<p>The <i>pause</i>() function shall suspend the calling thread until delivery of a signal whose action is either to execute a
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signal-catching function or to terminate the process.</p>
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<p>If the action is to terminate the process, <i>pause</i>() shall not return.</p>
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<p>If the action is to execute a signal-catching function, <i>pause</i>() shall return after the signal-catching function
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returns.</p>
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</blockquote>
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<h4><a name="tag_03_415_04"></a>RETURN VALUE</h4>
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<blockquote>
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<p>Since <i>pause</i>() suspends thread execution indefinitely unless interrupted by a signal, there is no successful completion
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return value. A value of -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_415_05"></a>ERRORS</h4>
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<blockquote>
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<p>The <i>pause</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_415_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_415_07"></a>APPLICATION USAGE</h4>
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<blockquote>
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<p>Many common uses of <i>pause</i>() have timing windows. The scenario involves checking a condition related to a signal and, if
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the signal has not occurred, calling <i>pause</i>(). When the signal occurs between the check and the call to <i>pause</i>(), the
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process often blocks indefinitely. The <a href="../functions/sigprocmask.html"><i>sigprocmask</i>()</a> and <a href=
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"../functions/sigsuspend.html"><i>sigsuspend</i>()</a> functions can be used to avoid this type of problem.</p>
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</blockquote>
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<h4><a name="tag_03_415_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_415_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_415_10"></a>SEE ALSO</h4>
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<blockquote>
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<p><a href="sigsuspend.html"><i>sigsuspend</i>()</a> , the Base Definitions volume of IEEE Std 1003.1-2001, <a href=
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"../basedefs/unistd.h.html"><i><unistd.h></i></a></p>
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</blockquote>
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<h4><a name="tag_03_415_11"></a>CHANGE HISTORY</h4>
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<blockquote>
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<p>First released in Issue 1. Derived from Issue 1 of the SVID.</p>
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</blockquote>
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<h4><a name="tag_03_415_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_415_13"></a>Issue 6</h4>
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<blockquote>
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<p>The APPLICATION USAGE section is added.</p>
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</blockquote>
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<div class="box"><em>End of informative text.</em></div>
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POSIX ® is a registered Trademark of The IEEE.<br>
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