Name
_exit, _Exit — terminate the calling process
Synopsis
#include <unistd.h>
void
_exit( |
int status); |
#include <stdlib.h>
void
_Exit( |
int status); |
![[Note]](../stylesheet/note.png) |
Note | |||
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DESCRIPTION
The function _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, init, and the process's
parent is sent a SIGCHLD
signal.
The value status
is returned to the parent process as the process's exit
status, and can be collected using one of the wait(2) family of
calls.
The function _Exit() is
equivalent to _exit().
NOTES
For a discussion on the effects of an exit, the transmission of exit status, zombie processes, signals sent, etc., see exit(3).
The function _exit() is like
exit(3), but does not call
any functions registered with atexit(3) or on_exit(3). Whether it
flushes standard I/O buffers and removes temporary files
created with tmpfile(3) is
implementation-dependent. On the other hand, _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 tcflush(3) before calling
_exit(). Whether any pending
I/O is canceled, and which pending I/O may be canceled upon
_exit(), is
implementation-dependent.
In glibc up to version 2.3, the _exit() wrapper function invoked the kernel
system call of the same name. Since glibc 2.3, the wrapper
function invokes exit_group(2), in order to
terminate all of the threads in a process.
SEE ALSO
execve(2), exit_group(2), fork(2), kill(2), wait(2), wait4(2), waitpid(2), atexit(3), exit(3), on_exit(3), termios(3)
COLOPHON
This page is part of release 3.33 of the Linux man-pages project. A
description of the project, and information about reporting
bugs, can be found at http://man7.org/linux/man-pages/.
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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 <faithcs.unc.edu> Modified 2001-11-17, aeb |