exit (2)

NAME

       _exit, _Exit - terminate the current process

SYNOPSIS

       #include <unistd.h>

       void _exit(int status);

       #include <stdlib.h>

       void _Exit(int status);

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 par-
       ent 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 family of
       calls.

       The function _Exit is equivalent to _exit.

RETURN VALUE

       These functions do not return.

CONFORMING TO

       SVr4, SVID, POSIX, X/OPEN, BSD 4.3.  The function  _Exit()  was  intro-
       duced 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 reg-
       istered with the ANSI C atexit function, nor any registered signal han-
       dlers. 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 pend-
       ing I/O may be cancelled upon _exit(), is implementation-dependent.

SEE ALSO

       fork(2), execve(2), waitpid(2), wait4(2),  kill(2),  wait(2),  exit(3),
       termios(3)

Linux                             2001-11-17                          _exit(2)