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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);

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() family of
       calls.

       The function _Exit() is equivalent to _exit().

RETURN VALUE

       These functions do not return.

CONFORMING TO

       SVr4, SVID, POSIX, X/OPEN, 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

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