_exit
NAME
_exit, _Exit - terminate the current process
SYNOPSIS
#include <unistd.h>
I void _exit(int status );
#include <stdlib.h>
I void _Exit(int status );
DESCRIPTION
The function
R _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,
R 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
R _Exit ()
is equivalent to
R _exit ().
RETURN VALUE
These functions do not return.
CONFORMING TO
SVr4, POSIX.1-2001, 4.3BSD.
The function
R _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
R _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,
R _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
R _exit ().
Whether any pending I/O is canceled, and which pending I/O may be
canceled upon
R _exit (),
is implementation-dependent.
