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Man page of _EXIT
_EXIT
Section: Linux Programmer's Manual (2)
Updated: 2016-03-15
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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():
-
_ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
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
POSIX.1-2001, POSIX.1-2008, SVr4, 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, and so on, see
exit(3).
The function
_exit()
is like
exit(3),
but does not call any
functions registered with
atexit(3)
or
on_exit(3).
Open
stdio(3)
streams are not flushed.
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.
C library/kernel differences
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 4.09 of the Linux
man-pages
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/.
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- CONFORMING TO
-
- NOTES
-
- C library/kernel differences
-
- SEE ALSO
-
- COLOPHON
-
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