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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"><html><head><!-- Copyright 1997 The Open Group, All Rights Reserved --><title>wait3</title></head><body bgcolor=white><center><font size=2>The Single UNIX ® Specification, Version 2<br>Copyright © 1997 The Open Group</font></center><hr size=2 noshade><h4><a name = "tag_000_010_437"> </a>NAME</h4><blockquote>wait3 - wait for a child process to change state(<b>LEGACY</b>)</blockquote><h4><a name = "tag_000_010_438"> </a>SYNOPSIS</h4><blockquote><pre><code>#include <<a href="syswait.h.html">sys/wait.h</a>>pid_t wait3 (int *<i>stat_loc</i>, int <i>options</i>, struct rusage *<i>resource_usage</i>);</code></pre></blockquote><h4><a name = "tag_000_010_439"> </a>DESCRIPTION</h4><blockquote>The<i>wait3()</i>function allows the calling thread to obtain status information for specifiedchild processes.<p>The following call:<pre><code>wait3(stat_loc, options, resource_usage);</code></pre>is equivalent to the call:<pre><code>waitpid((pid_t)-1, stat_loc, options);</code></pre>except that on successful completion, if the <i>resource_usage</i> argument to<i>wait3()</i>is not a null pointer, the rusage structure that the third argument points tois filled in for the child process identified by the return value.<p>This interface need not be reentrant.</blockquote><h4><a name = "tag_000_010_440"> </a>RETURN VALUE</h4><blockquote>See<i><a href="waitpid.html">waitpid()</a></i>.</blockquote><h4><a name = "tag_000_010_441"> </a>ERRORS</h4><blockquote>In addition to the error conditions specified on<i><a href="waitpid.html">waitpid()</a></i>,under the following conditions,<i>wait3()</i>may fail and set <i>errno</i> to:<dl compact><dt>[ECHILD]<dd>The calling process has no existing unwaited-for child processes, or if theset of processes specified by the argument <i>pid</i> can never be in thestates specified by the argument <i>options</i>.<dt>[ENOSYS]<dd>The<i>wait3()</i>function is not supported on this implementation.</dl></blockquote><h4><a name = "tag_000_010_442"> </a>EXAMPLES</h4><blockquote>None.</blockquote><h4><a name = "tag_000_010_443"> </a>APPLICATION USAGE</h4><blockquote>New applications should use<i><a href="waitpid.html">waitpid()</a></i>.</blockquote><h4><a name = "tag_000_010_444"> </a>FUTURE DIRECTIONS</h4><blockquote>None.</blockquote><h4><a name = "tag_000_010_445"> </a>SEE ALSO</h4><blockquote><i><a href="exec.html">exec</a></i>,<i><a href="exit.html">exit()</a></i>,<i><a href="fork.html">fork()</a></i>,<i><a href="pause.html">pause()</a></i>,<i><a href="waitpid.html">waitpid()</a></i>,<i><a href="syswait.h.html"><sys/wait.h></a></i>.</blockquote><hr size=2 noshade><center><font size=2>UNIX ® is a registered Trademark of The Open Group.<br>Copyright © 1997 The Open Group<br> [ <a href="../index.html">Main Index</a> | <a href="../xshix.html">XSH</a> | <a href="../xcuix.html">XCU</a> | <a href="../xbdix.html">XBD</a> | <a href="../cursesix.html">XCURSES</a> | <a href="../xnsix.html">XNS</a> ]</font></center><hr size=2 noshade></body></html>⌨️ 快捷键说明
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