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exit.html
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<!-- Creator : groff version 1.22.4 -->
<!-- CreationDate: Wed Jan 29 11:26:55 2020 -->
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta name="generator" content="groff -Thtml, see www.gnu.org">
<meta http-equiv="Content-Type" content="text/html; charset=US-ASCII">
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<title>_EXIT</title>
</head>
<body>
<h1 align="center">_EXIT</h1>
<a href="#NAME">NAME</a><br>
<a href="#SYNOPSIS">SYNOPSIS</a><br>
<a href="#DESCRIPTION">DESCRIPTION</a><br>
<a href="#RETURN VALUE">RETURN VALUE</a><br>
<a href="#CONFORMING TO">CONFORMING TO</a><br>
<a href="#NOTES">NOTES</a><br>
<a href="#SEE ALSO">SEE ALSO</a><br>
<a href="#COLOPHON">COLOPHON</a><br>
<hr>
<h2>NAME
<a name="NAME"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em">_exit, _Exit -
terminate the calling process</p>
<h2>SYNOPSIS
<a name="SYNOPSIS"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em"><b>#include
<unistd.h></b></p>
<p style="margin-left:11%; margin-top: 1em"><b>void
_exit(int</b> <i>status</i><b>);</b></p>
<p style="margin-left:11%; margin-top: 1em"><b>#include
<stdlib.h></b></p>
<p style="margin-left:11%; margin-top: 1em"><b>void
_Exit(int</b> <i>status</i><b>);</b></p>
<p style="margin-left:5%; margin-top: 1em">Feature Test
Macro Requirements for glibc (see
<b>feature_test_macros</b>(7)):</p>
<p style="margin-left:11%; margin-top: 1em"><b>_Exit</b>():</p>
<p style="margin-left:17%;">_ISOC99_SOURCE ||
_POSIX_C_SOURCE >= 200112L</p>
<h2>DESCRIPTION
<a name="DESCRIPTION"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em">The function
<b>_exit</b>() terminates the calling process
"immediately". Any open file descriptors belonging
to the process are closed. Any children of the process are
inherited by <b>init</b>(1) (or by the nearest
"subreaper" process as defined through the use of
the <b>prctl</b>(2) <b>PR_SET_CHILD_SUBREAPER</b>
operation). The process’s parent is sent a
<b>SIGCHLD</b> signal.</p>
<p style="margin-left:11%; margin-top: 1em">The value
<i>status & 0377</i> is returned to the parent process
as the process’s exit status, and can be collected
using one of the <b>wait</b>(2) family of calls.</p>
<p style="margin-left:11%; margin-top: 1em">The function
<b>_Exit</b>() is equivalent to <b>_exit</b>().</p>
<h2>RETURN VALUE
<a name="RETURN VALUE"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em">These functions
do not return.</p>
<h2>CONFORMING TO
<a name="CONFORMING TO"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em">POSIX.1-2001,
POSIX.1-2008, SVr4, 4.3BSD. The function <b>_Exit</b>() was
introduced by C99.</p>
<h2>NOTES
<a name="NOTES"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em">For a
discussion on the effects of an exit, the transmission of
exit status, zombie processes, signals sent, and so on, see
<b>exit</b>(3).</p>
<p style="margin-left:11%; margin-top: 1em">The function
<b>_exit</b>() is like <b>exit</b>(3), but does not call any
functions registered with <b>atexit</b>(3) or
<b>on_exit</b>(3). Open <b>stdio</b>(3) streams are not
flushed. On the other hand, <b>_exit</b>() does close open
file descriptors, and this may cause an unknown delay,
waiting for pending output to finish. If the delay is
undesired, it may be useful to call functions like
<b>tcflush</b>(3) before calling <b>_exit</b>(). Whether any
pending I/O is canceled, and which pending I/O may be
canceled upon <b>_exit</b>(), is
implementation-dependent.</p>
<p style="margin-left:11%; margin-top: 1em"><b>C
library/kernel differences</b> <br>
In glibc up to version 2.3, the <b>_exit</b>() wrapper
function invoked the kernel system call of the same name.
Since glibc 2.3, the wrapper function invokes
<b>exit_group</b>(2), in order to terminate all of the
threads in a process.</p>
<h2>SEE ALSO
<a name="SEE ALSO"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em"><b>execve</b>(2),
<b>exit_group</b>(2), <b>fork</b>(2), <b>kill</b>(2),
<b>wait</b>(2), <b>wait4</b>(2), <b>waitpid</b>(2),
<b>atexit</b>(3), <b>exit</b>(3), <b>on_exit</b>(3),
<b>termios</b>(3)</p>
<h2>COLOPHON
<a name="COLOPHON"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em">This page is
part of release 5.02 of the Linux <i>man-pages</i> project.
A description of the project, information about reporting
bugs, and the latest version of this page, can be found at
https://www.kernel.org/doc/man-pages/.</p>
<hr>
</body>
</html>