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_EXIT(2) Linux Programmer's Manual _EXIT(2)
NAME
_exit, _Exit - terminate the calling process
SYNOPSIS
#include <unistd.h>
void _exit(int status);
#include <stdlib.h>
void _Exit(int status);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
_Exit(): _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE; or cc -std=c99
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().
RETURN VALUE
These functions do not return.
CONFORMING TO
SVr4, POSIX.1-2001, 4.3BSD. The function _Exit() was introduced by C99.
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 pend-
ing I/O is canceled, and which pending I/O may be canceled upon _exit(), is imple-
mentation-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 3.22 of the Linux man-pages project. A description of
the project, and information about reporting bugs, can be found at http://www.ker-
nel.org/doc/man-pages/.
Linux 2008-11-27 _EXIT(2)
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On Apache/2.2.15 (CentOS)
Under GNU General Public License
2013-05-20 08:37 @127.0.0.1 CrawledBy CCBot/2.0