_exit

       #include <unistd.h>

       void _exit(int status);

       #include <stdlib.h>

       void _Exit(int status);

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

       _Exit():
           _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE ||
           _POSIX_C_SOURCE >= 200112L;
           or cc -std=c99

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(2)  family  of
       calls.

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

RETURN VALUE
       These functions do not return.

CONFORMING TO
       POSIX.1-2001,  POSIX.1-2008,  SVr4,  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, and so on, see exit(3).

       The  function  _exit() is like exit(3), but does not call any functions
       registered with atexit(3) or on_exit(3).  Open stdio(3) streams are not
       flushed.   On the other hand, _exit() does close open file descriptors,
       and this may cause an unknown delay, waiting for pending output to fin-
       ish.   If  the  delay  is undesired, it may be useful to call functions
       like tcflush(3) before calling _exit().  Whether  any  pending  I/O  is
       canceled, and which pending I/O may be canceled upon _exit(), is imple-
       mentation-dependent.

   C library/kernel differences
       In glibc up to version 2.3, the _exit() wrapper  function  invoked  the
       kernel  system  call  of  the  same name.  Since glibc 2.3, the wrapper
       function invokes exit_group(2),  in  order  to  terminate  all  of  the
       threads in a process.

SEE ALSO
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