197 lines
6.3 KiB
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197 lines
6.3 KiB
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<title><sys/wait.h></title>
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<basefont size="3"> <a name="<sys/wait.h>"></a> <a name="tag_13_71"></a><!-- <sys/wait.h> -->
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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_13_71_01"></a>NAME</h4>
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<blockquote>sys/wait.h - declarations for waiting</blockquote>
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<h4><a name="tag_13_71_02"></a>SYNOPSIS</h4>
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<blockquote class="synopsis">
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<p><tt>#include <sys/wait.h></tt></p>
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</blockquote>
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<h4><a name="tag_13_71_03"></a>DESCRIPTION</h4>
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<blockquote>
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<p>The <i><sys/wait.h></i> header shall define the following symbolic constants for use with <a href=
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"../../functions/waitpid.html"><i>waitpid</i>()</a>:</p>
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<dl compact>
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<dt>WNOHANG</dt>
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<dd>Do not hang if no status is available; return immediately.</dd>
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<dt>WUNTRACED</dt>
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<dd>Report status of stopped child process.</dd>
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</dl>
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<p>The <i><sys/wait.h></i> header shall define the following macros for analysis of process status values:</p>
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<dl compact>
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<dt>WEXITSTATUS</dt>
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<dd>Return exit status.</dd>
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<dt>WIFCONTINUED</dt>
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<dd><sup>[<a href="javascript:open_code('XSI')">XSI</a>]</sup> <img src="../../images/opt-start.gif" alt="[Option Start]" border=
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"0"> True if child has been continued. <img src="../../images/opt-end.gif" alt="[Option End]" border="0"></dd>
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<dt>WIFEXITED</dt>
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<dd>True if child exited normally.</dd>
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<dt>WIFSIGNALED</dt>
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<dd>True if child exited due to uncaught signal.</dd>
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<dt>WIFSTOPPED</dt>
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<dd>True if child is currently stopped.</dd>
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<dt>WSTOPSIG</dt>
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<dd>Return signal number that caused process to stop.</dd>
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<dt>WTERMSIG</dt>
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<dd>Return signal number that caused process to terminate.</dd>
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</dl>
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<p><sup>[<a href="javascript:open_code('XSI')">XSI</a>]</sup> <img src="../../images/opt-start.gif" alt="[Option Start]" border=
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"0"> The following symbolic constants shall be defined as possible values for the <i>options</i> argument to <a href=
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"../../functions/waitid.html"><i>waitid</i>()</a>:</p>
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<dl compact>
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<dt>WEXITED</dt>
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<dd>Wait for processes that have exited.</dd>
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<dt>WSTOPPED</dt>
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<dd>Status is returned for any child that has stopped upon receipt of a signal.</dd>
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<dt>WCONTINUED</dt>
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<dd>Status is returned for any child that was stopped and has been continued.</dd>
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<dt>WNOHANG</dt>
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<dd>Return immediately if there are no children to wait for.</dd>
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<dt>WNOWAIT</dt>
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<dd>Keep the process whose status is returned in <i>infop</i> in a waitable state.</dd>
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</dl>
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<p>The type <b>idtype_t</b> shall be defined as an enumeration type whose possible values shall include at least the following:
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P_ALL P_PID P_PGID <img src="../../images/opt-end.gif" alt="[Option End]" border="0"></p>
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<p>The <b>id_t</b> and <b>pid_t</b> types shall be defined as described in <a href=
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"../sys/types.h.html#tag_13_67"><i><sys/types.h></i></a> .</p>
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<p><sup>[<a href="javascript:open_code('XSI')">XSI</a>]</sup> <img src="../../images/opt-start.gif" alt="[Option Start]" border=
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"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>
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.</p>
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<p>The <b>rusage</b> structure shall be defined as described in <a href=
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"../sys/resource.h.html#tag_13_57"><i><sys/resource.h></i></a> .</p>
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<p>Inclusion of the <i><sys/wait.h></i> header may also make visible all symbols from <a href=
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"../../basedefs/signal.h.html"><i><signal.h></i></a> and <a href=
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"../../basedefs/sys/resource.h.html"><i><sys/resource.h></i></a>. <img src="../../images/opt-end.gif" alt="[Option End]"
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border="0"></p>
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<p>The following shall be declared as functions and may also be defined as macros. Function prototypes shall be provided.</p>
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<pre>
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<tt>pid_t wait(int *);
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<sup>[<a href="javascript:open_code('XSI')">XSI</a>]</sup><img src="../../images/opt-start.gif" alt="[Option Start]" border="0">
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int waitid(idtype_t, id_t, siginfo_t *, int);
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<img src="../../images/opt-end.gif" alt="[Option End]" border="0">
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pid_t waitpid(pid_t, int *, int);
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</tt>
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</pre>
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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_13_71_04"></a>APPLICATION USAGE</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_13_71_05"></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_13_71_06"></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_13_71_07"></a>SEE ALSO</h4>
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<blockquote>
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<p><a href="../signal.h.html#tag_13_43"><i><signal.h></i></a> , <a href=
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"../sys/resource.h.html#tag_13_57"><i><sys/resource.h></i></a> , <a href=
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"../sys/types.h.html#tag_13_67"><i><sys/types.h></i></a> , the System Interfaces volume of IEEE Std 1003.1-2001, <a
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href="../../functions/wait.html"><i>wait</i>()</a>, <a href="../../functions/waitid.html"><i>waitid</i>()</a></p>
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</blockquote>
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<h4><a name="tag_13_71_08"></a>CHANGE HISTORY</h4>
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<blockquote>
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<p>First released in Issue 3.</p>
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<p>Included for alignment with the POSIX.1-1988 standard.</p>
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</blockquote>
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<h4><a name="tag_13_71_09"></a>Issue 6</h4>
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<blockquote>
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<p>The <i>wait3</i>() function is removed.</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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