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_EXIT
Section: Linux Programmer's Manual (2)
Updated: 2007-07-26
Index
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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():
_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 pending I/O is canceled, and which pending I/O may be
canceled upon
_exit(),
is implementation-dependent.
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 3.05 of the Linux
man-pages
project.
A description of the project,
and information about reporting bugs,
can be found at
http://www.kernel.org/doc/man-pages/.
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- CONFORMING TO
-
- NOTES
-
- SEE ALSO
-
- COLOPHON
-
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