<!DOCTYPE html PUBLIC "‐//W3C//DTD XHTML 1.1//EN"
        "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">     <html
xmlns="http://www.w3.org/1999/xhtml"> <head>
    <link            rel="stylesheet"             type="text/css"
href="../../../style.css" title="style" />
    <link  rel="stylesheet"  type="text/css"  href="../style.css"
title="style" />
    <meta             http‐equiv="content‐type"              con‐
tent="text/html;charset=utf‐8" />

    <title>sys_wait.h.0p ‐ Linux manual page</title> </head>

<body>

<div        class="page‐top"><a       id="top_of_page"></a></div>
<!‐‐%%%TOP_BAR%%%‐‐> <!‐‐%%%PAGE_START%%%‐‐>

<table class="sec‐table"> <tr>
    <td>
        <p class="section‐dir"> <a href="#PROLOG">PROLOG</a> | <a
href="#NAME">NAME</a>  |  <a  href="#SYNOPSIS">SYNOPSIS</a>  | <a
href="#DESCRIPTION">DESCRIPTION</a> |  <a  href="#APPLICATION_US‐
AGE">APPLICATION&nbsp;USAGE</a>   |  <a  href="#RATIONALE">RATIO‐
NALE</a>   |   <a    href="#FUTURE_DIRECTIONS">FUTURE&nbsp;DIREC‐
TIONS</a>    |   <a   href="#SEE_ALSO">SEE&nbsp;ALSO</a>   |   <a
href="#COPYRIGHT">COPYRIGHT</a>
        </p>
    </td>
    <td class="search‐box">
        <div class="man‐search‐box">

            <form                method="get"                 ac‐
tion="http://www.google.com/search">
                <fieldset class="man‐search">
                    <input    type="text"    name="q"   size="10"
maxlength="255" value="" />
                    <input type="hidden"  name="sitesearch"  val‐
ue="man7.org/linux/man‐pages" />
                    <input  type="submit" name="sa" value="Search
online pages" />
                </fieldset>
            </form>

        </div>
    </td>
    <td> </td> </tr> </table>

<pre> <span class="headline">sys_wait.h(0P)            POSIX Pro‐
grammer’s  Manual            sys_wait.h(0P)</span>  </pre> <h2><a
id="PROLOG" href="#PROLOG"></a>PROLOG  &nbsp; &nbsp; &nbsp;  &nb‐
sp;        <a        href="#top_of_page"><span        class="top‐
link">top</span></a></h2><pre>
       This manual page is part of the POSIX Programmer’s Manual.
The Linux
       implementation of this interface may differ (consult the
       corresponding  Linux  manual page for details of Linux be‐
havior), or
       the interface may not be  implemented  on  Linux.   </pre>
<h2><a id="NAME" href="#NAME"></a>NAME  &nbsp; &nbsp; &nbsp; &nb‐
sp;        <a        href="#top_of_page"><span        class="top‐
link">top</span></a></h2><pre>
       sys/wait.h   —  declarations  for  waiting  </pre>  <h2><a
id="SYNOPSIS" href="#SYNOPSIS"></a>SYNOPSIS  &nbsp; &nbsp; &nbsp;
&nbsp;       <a       href="#top_of_page"><span       class="top‐
link">top</span></a></h2><pre>
       #include &lt;sys/wait.h&gt; </pre> <h2><a id="DESCRIPTION"
href="#DESCRIPTION"></a>DESCRIPTION   &nbsp; &nbsp; &nbsp; &nbsp;
<a             href="#top_of_page"><span              class="top‐
link">top</span></a></h2><pre>
       The <i>&lt;sys/wait.h&gt;</i> header shall define the fol‐
lowing symbolic constants
       for use with <i>waitpid</i>():

       WCONTINUED    Report status of continued child process.

       WNOHANG       Do not hang if no status is  available;  re‐
turn
                     immediately.

       WUNTRACED     Report status of stopped child process.

       The <i>&lt;sys/wait.h&gt;</i> header shall define the fol‐
lowing macros for
       analysis of process status values:

       WEXITSTATUS   Return exit status.

       WIFCONTINUED  True if child has been continued.

       WIFEXITED     True if child exited normally.

       WIFSIGNALED   True if child exited due to uncaught signal.

       WIFSTOPPED    True if child is currently stopped.

       WSTOPSIG      Return signal number that caused process  to
stop.

       WTERMSIG       Return signal number that caused process to
terminate.

       The <i>&lt;sys/wait.h&gt;</i> header shall define the fol‐
lowing symbolic constants
       as  possible  values  for  the  <i>options</i> argument to
<i>waitid</i>():

       WEXITED       Wait for processes that have exited.

       WNOWAIT       Keep the process whose status is returned in
<i>infop</i> in a
                     waitable state.

       WSTOPPED       Status  is  returned for any child that has
stopped upon
                     receipt of a signal.

       The WCONTINUED and WNOHANG constants, described above  for
<i>waitpid</i>(),
       can also be used with <i>waitid</i>().

       The  type  <b>idtype_t </b>shall be defined as an enumera‐
tion type whose
       possible values shall  include  at  least  the  following:
P_ALL P_PGID
       P_PID

       The  <i>&lt;sys/wait.h&gt;</i>  header  shall  define  the
<b>id_t </b>and <b>pid_t </b>types as
       described in <i>&lt;sys/types.h&gt;</i>.

       The  <i>&lt;sys/wait.h&gt;</i>  header  shall  define  the
<b>siginfo_t </b>type as described
       in <i>&lt;signal.h&gt;</i>.

       Inclusion of the <i>&lt;sys/wait.h&gt;</i> header may also
make visible all
       symbols from <i>&lt;signal.h&gt;</i>.

       The following shall be declared as functions and may  also
be defined
       as macros. Function prototypes shall be provided.

           <b>pid_t  wait(int *);</b>
           <b>int       waitid(idtype_t,   id_t,   siginfo_t   *,
int);</b>
           <b>pid_t  waitpid(pid_t, int *, int);</b>

       <i>The  following  sections  are  informative.</i>  </pre>
<h2><a  id="APPLICATION_USAGE"  href="#APPLICATION_USAGE"></a>AP‐
PLICATION    USAGE     &nbsp;    &nbsp;    &nbsp;    &nbsp;    <a
href="#top_of_page"><span                             class="top‐
link">top</span></a></h2><pre>
       None.    </pre>   <h2><a   id="RATIONALE"    href="#RATIO‐
NALE"></a>RATIONALE     &nbsp;    &nbsp;    &nbsp;    &nbsp;   <a
href="#top_of_page"><span                             class="top‐
link">top</span></a></h2><pre>
       None.   </pre>  <h2><a  id="FUTURE_DIRECTIONS"  href="#FU‐
TURE_DIRECTIONS"></a>FUTURE DIRECTIONS  &nbsp; &nbsp; &nbsp; &nb‐
sp;        <a        href="#top_of_page"><span        class="top‐
link">top</span></a></h2><pre>
       None.    </pre>   <h2><a   id="SEE_ALSO"    href="#SEE_AL‐
SO"></a>SEE    ALSO     &nbsp;    &nbsp;    &nbsp;    &nbsp;   <a
href="#top_of_page"><span                             class="top‐
link">top</span></a></h2><pre>
       <a   href="../man0/signal.h.0p.html">signal.h(0p)</a>,  <a
href="../man0/sys_types.h.0p.html">sys_types.h(0p)</a>

       The  System  Interfaces   volume   of   POSIX.1‐2008,   <a
href="../man3/wait.3p.html">wait(3p)</a>,  <a href="../man3/wait‐
id.3p.html">waitid(3p)</a>    </pre>    <h2><a     id="COPYRIGHT"
href="#COPYRIGHT"></a>COPYRIGHT   &nbsp;  &nbsp; &nbsp; &nbsp; <a
href="#top_of_page"><span                             class="top‐
link">top</span></a></h2><pre>
       Portions  of  this  text  are  reprinted and reproduced in
electronic form
       from IEEE Std 1003.1, 2013 Edition, Standard for  Informa‐
tion
       Technology ‐‐ Portable Operating System Interface (POSIX),
The Open
       Group Base Specifications Issue 7, Copyright (C)  2013  by
the
       Institute of Electrical and Electronics Engineers, Inc and
The Open
       Group.  (This is POSIX.1‐2008 with the 2013 Technical Cor‐
rigendum 1
       applied.)  In  the  event  of any discrepancy between this
version and
       the original IEEE and The Open Group Standard, the  origi‐
nal IEEE and
       The Open Group Standard is the referee document. The orig‐
inal
       Standard    can    be    obtained     online     at     <a
href="http://www.unix.org/online.html">http://www.unix.org/on‐
line.html</a> .

       Any typographical or formatting errors that appear in this
page are
       most  likely to have been introduced during the conversion
of the
       source files to man page format. To  report  such  errors,
see
       <a      href="https://www.kernel.org/doc/man‐pages/report‐
ing_bugs.html">https://www.kernel.org/doc/man‐pages/report‐
ing_bugs.html</a> .

<span  class="footline">IEEE/The  Open Group                 2013
sys_wait.h(0P)</span> </pre>

<hr class="end‐man‐text" />

<hr class="start‐footer" />

<div class="footer">

<table class="colophon‐table">
    <tr>
    <td class="pub‐info">
        <p>
            HTML rendering created 2019‐08‐02
            by  <a  href="http://man7.org/mtk/index.html">Michael
Kerrisk</a>,
            author of
            <a  href="http://man7.org/tlpi/"><em>The  Linux  Pro‐
gramming Interface</em></a>,
            maintainer of the
            <a href="https://www.kernel.org/doc/man‐pages/">Linux
<em>man‐pages</em> project</a>.
        </p>
        <p>
            For details of in‐depth
            <strong>Linux/UNIX  system programming training cour‐
ses</strong>
            that I teach,  look  <a  href="http://man7.org/train‐
ing/">here</a>.
        </p>
        <p>
            Hosting    by    <a   href="http://www.jambit.com/in‐
dex_en.html">jambit GmbH</a>.
        </p>
        <p>
            <a href="http://validator.w3.org/check?uri=referer">
            <img src="http://www.w3.org/Icons/valid‐xhtml11"
                alt="Valid XHTML 1.1" height="31" width="88" />
            </a>
        </p>
    </td>
    <td class="colophon‐divider">
    </td>
    <td class="tlpi‐cover">
        <a                      href="http://man7.org/tlpi/"><img
src="http://man7.org/tlpi/cover/TLPI‐front‐cover‐vsmall.png"
alt="Cover of TLPI" /></a>
    </td>
    </tr> </table>

</div>

<hr class="end‐footer" />

</body> </html>