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Linux 2.6 - man page for _exit (linux section 2)

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

       _exit, _Exit - terminate the calling process

       #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)):

	   _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L;
	   or cc -std=c99

       The function _exit() terminates the calling process "immediately".  Any open file descrip-
       tors 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(2) family of calls.

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

       These functions do not return.

       SVr4, POSIX.1-2001, 4.3BSD.  The function _Exit() was introduced by C99.

       For a discussion on the effects of an exit, the transmission of exit status,  zombie  pro-
       cesses, 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).  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.

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

       This page is part of release 3.55 of the Linux man-pages project.  A  description  of  the
       project,     and    information	  about    reporting	bugs,	 can	be    found    at

Linux					    2010-09-20					 _EXIT(2)

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