_EXIT man page on Scientific

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_EXIT(2)		   Linux Programmer's Manual		      _EXIT(2)

NAME
       _exit, _Exit - terminate the calling process

SYNOPSIS
       #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; 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
       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(3), but does not call	any  functions
       registered  with	 atexit(3) or on_exit(3).  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(3) before calling _exit().  Whether  any
       pending	I/O  is	 canceled,  and which pending I/O may be canceled upon
       _exit(), is implementation-dependent.

       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
       execve(2),  exit_group(2),  fork(2),  kill(2), wait(2), wait4(2), wait‐
       pid(2), atexit(3), exit(3), on_exit(3), termios(3)

COLOPHON
       This page is part of release 3.22 of the Linux  man-pages  project.   A
       description  of	the project, and information about reporting bugs, can
       be found at http://www.kernel.org/doc/man-pages/.

Linux				  2008-11-27			      _EXIT(2)
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