_exit() - Unix, Linux System Call
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NAME
_exit, _Exit - terminate the current process
SYNOPSIS
#include <unistd.h>
void _exit(int status);
#include <stdlib.h>
void _Exit(int status);
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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 processs parent is sent a
SIGCHLD signal.
The value
status is returned to the parent process as the processs exit status, and
can be collected using one of the
wait() 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(), but does not call any
functions registered with
atexit() or
on_exit(). 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() before
calling _exit().
Whether any pending I/O is cancelled, and which pending I/O may be
cancelled upon _exit(), is implementation-dependent.
SEE ALSO
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