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.\" manual page may be incorrect or out-of-date.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