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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><sys/wait.h></title></head><body bgcolor="white"><script type="text/javascript" language="JavaScript" src="../../jscript/dotcode.js"></script><basefont size="3"> <a name="<sys/wait.h>"></a> <a name="tag_13_71"></a><!-- <sys/wait.h> --> <!--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_13_71_01"></a>NAME</h4><blockquote>sys/wait.h - declarations for waiting</blockquote><h4><a name="tag_13_71_02"></a>SYNOPSIS</h4><blockquote class="synopsis"><p><tt>#include <sys/wait.h></tt></p></blockquote><h4><a name="tag_13_71_03"></a>DESCRIPTION</h4><blockquote><p>The <i><sys/wait.h></i> header shall define the following symbolic constants for use with <a href="../../functions/waitpid.html"><i>waitpid</i>()</a>:</p><dl compact><dt>WNOHANG</dt><dd>Do not hang if no status is available; return immediately.</dd><dt>WUNTRACED</dt><dd>Report status of stopped child process.</dd></dl><p>The <i><sys/wait.h></i> header shall define the following macros for analysis of process status values:</p><dl compact><dt>WEXITSTATUS</dt><dd>Return exit status.</dd><dt>WIFCONTINUED</dt><dd><sup>[<a href="javascript:open_code('XSI')">XSI</a>]</sup> <img src="../../images/opt-start.gif" alt="[Option Start]" border="0"> True if child has been continued. <img src="../../images/opt-end.gif" alt="[Option End]" border="0"></dd><dt>WIFEXITED</dt><dd>True if child exited normally.</dd><dt>WIFSIGNALED</dt><dd>True if child exited due to uncaught signal.</dd><dt>WIFSTOPPED</dt><dd>True if child is currently stopped.</dd><dt>WSTOPSIG</dt><dd>Return signal number that caused process to stop.</dd><dt>WTERMSIG</dt><dd>Return signal number that caused process to terminate.</dd></dl><p><sup>[<a href="javascript:open_code('XSI')">XSI</a>]</sup> <img src="../../images/opt-start.gif" alt="[Option Start]" border="0"> The following symbolic constants shall be defined as possible values for the <i>options</i> argument to <a href="../../functions/waitid.html"><i>waitid</i>()</a>:</p><dl compact><dt>WEXITED</dt><dd>Wait for processes that have exited.</dd><dt>WSTOPPED</dt><dd>Status is returned for any child that has stopped upon receipt of a signal.</dd><dt>WCONTINUED</dt><dd>Status is returned for any child that was stopped and has been continued.</dd><dt>WNOHANG</dt><dd>Return immediately if there are no children to wait for.</dd><dt>WNOWAIT</dt><dd>Keep the process whose status is returned in <i>infop</i> in a waitable state.</dd></dl><p>The type <b>idtype_t</b> shall be defined as an enumeration type whose possible values shall include at least the following:P_ALL P_PID P_PGID <img src="../../images/opt-end.gif" alt="[Option End]" border="0"></p><p>The <b>id_t</b> and <b>pid_t</b> types shall be defined as described in <a href="../sys/types.h.html#tag_13_67"><i><sys/types.h></i></a> .</p><p><sup>[<a href="javascript:open_code('XSI')">XSI</a>]</sup> <img src="../../images/opt-start.gif" alt="[Option Start]" border="0"> The <b>siginfo_t</b> type shall be defined as described in <a href="../signal.h.html#tag_13_43"><i><signal.h></i></a>.</p><p>The <b>rusage</b> structure shall be defined as described in <a href="../sys/resource.h.html#tag_13_57"><i><sys/resource.h></i></a> .</p><p>Inclusion of the <i><sys/wait.h></i> header may also make visible all symbols from <a href="../../basedefs/signal.h.html"><i><signal.h></i></a> and <a href="../../basedefs/sys/resource.h.html"><i><sys/resource.h></i></a>. <img src="../../images/opt-end.gif" alt="[Option End]"border="0"></p><p>The following shall be declared as functions and may also be defined as macros. Function prototypes shall be provided.</p><pre><tt>pid_t wait(int *);<sup>[<a href="javascript:open_code('XSI')">XSI</a>]</sup><img src="../../images/opt-start.gif" alt="[Option Start]" border="0">int waitid(idtype_t, id_t, siginfo_t *, int);<img src="../../images/opt-end.gif" alt="[Option End]" border="0">pid_t waitpid(pid_t, int *, int);</tt></pre></blockquote><hr><div class="box"><em>The following sections are informative.</em></div><h4><a name="tag_13_71_04"></a>APPLICATION USAGE</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_13_71_05"></a>RATIONALE</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_13_71_06"></a>FUTURE DIRECTIONS</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_13_71_07"></a>SEE ALSO</h4><blockquote><p><a href="../signal.h.html#tag_13_43"><i><signal.h></i></a> , <a href="../sys/resource.h.html#tag_13_57"><i><sys/resource.h></i></a> , <a href="../sys/types.h.html#tag_13_67"><i><sys/types.h></i></a> , the System Interfaces volume of IEEE Std 1003.1-2001, <ahref="../../functions/wait.html"><i>wait</i>()</a>, <a href="../../functions/waitid.html"><i>waitid</i>()</a></p></blockquote><h4><a name="tag_13_71_08"></a>CHANGE HISTORY</h4><blockquote><p>First released in Issue 3.</p><p>Included for alignment with the POSIX.1-1988 standard.</p></blockquote><h4><a name="tag_13_71_09"></a>Issue 6</h4><blockquote><p>The <i>wait3</i>() function is removed.</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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