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.\" Hey Emacs! This file is -*- nroff -*- source.
.\"
.\" This manpage is Copyright (C) 1992 Drew Eckhardt;
.\" 1993 Michael Haardt, Ian Jackson.
.\"
.\" Permission is granted to make and distribute verbatim copies of this
.\" manual provided the copyright notice and this permission notice are
.\" preserved on all copies.
.\"
.\" Permission is granted to copy and distribute modified versions of this
.\" manual under the conditions for verbatim copying, provided that the
.\" entire resulting derived work is distributed under the terms of a
.\" permission notice identical to this one.
.\"
.\" Since the Linux kernel and libraries are constantly changing, this
.\" manual page may be incorrect or out-of-date. The author(s) assume no
.\" responsibility for errors or omissions, or for damages resulting from
.\" the use of the information contained herein. The author(s) may not
.\" have taken the same level of care in the production of this manual,
.\" which is licensed free of charge, as they might when working
.\" professionally.
.\"
.\" Formatted or processed versions of this manual, if unaccompanied by
.\" the source, must acknowledge the copyright and authors of this work.
.\"
.\" Modified Wed Jul 21 23:02:38 1993 by Rik Faith <faith@cs.unc.edu>
.\" Modified 2001-11-17, aeb
.\"
.TH _EXIT 2 2007-07-26 "Linux" "Linux Programmer's Manual"
.SH NAME
_exit, _Exit \- terminate the current process
.SH SYNOPSIS
.B #include <unistd.h>
.sp
.BI "void _exit(int " status );
.sp
.B #include <stdlib.h>
.sp
.BI "void _Exit(int " status );
.sp
.in -4n
Feature Test Macro Requirements for glibc (see
.BR feature_test_macros (7)):
.in
.sp
.BR _Exit ():
_XOPEN_SOURCE\ >=\ 600 || _ISOC99_SOURCE; or
.I cc\ -std=c99
.SH DESCRIPTION
The function
.BR _exit ()
terminates the calling process "immediately".
Any open file descriptors
belonging to the process are closed; any children of the process are
inherited by process 1,
.IR init ,
and the process's parent is sent a
.B SIGCHLD
signal.
.LP
The value
.I status
is returned to the parent process as the process's exit status, and
can be collected using one of the
.BR wait (2)
family of calls.
.LP
The function
.BR _Exit ()
is equivalent to
.BR _exit ().
.SH "RETURN VALUE"
These functions do not return.
.SH "CONFORMING TO"
SVr4, POSIX.1-2001, 4.3BSD.
The function
.BR _Exit ()
was introduced by C99.
.SH NOTES
For a discussion on the effects of an exit, the transmission of
exit status, zombie processes, signals sent, etc., see
.BR exit (3).
.LP
The function
.BR _exit ()
is like
.BR exit (3),
but does not call any
functions registered with
.BR atexit (3)
or
.BR on_exit (3).
Whether it flushes
standard I/O buffers and removes temporary files created with
.BR tmpfile (3)
is implementation-dependent.
On the other hand,
.BR _exit ()
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
.BR tcflush (3)
before calling
.BR _exit ().
Whether any pending I/O is canceled, and which pending I/O may be
canceled upon
.BR _exit (),
is implementation-dependent.
.SH "SEE ALSO"
.BR execve (2),
.BR exit_group (2),
.BR fork (2),
.BR kill (2),
.BR wait (2),
.BR wait4 (2),
.BR waitpid (2),
.BR atexit (3),
.BR exit (3),
.BR on_exit (3),
.BR termios (3)
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