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_EXIT(2)                   Linux Programmer's Manual                  _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(2,3,n) file(1,n) 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(3,n,1 builtins)  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(3,n,1 builtins), the transmission of exit(3,n,1 builtins)
       status, zombie processes, signals sent, etc., see exit(3,n,1 builtins)(3).

       The function _exit is like exit(3,n,1 builtins)(), but does not call any functions reg-
       istered with the ANSI C atexit function, nor any registered signal(2,7) 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(2,7,n) open(2,3,n) file(1,n) 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(1,2,1 builtins)(2),  wait(2),  exit(3,n,1 builtins)(3),
       termios(3)



Linux                             2001-11-17                          _EXIT(2)

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