_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 || _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 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().

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), waitpid(2), atexit(3), exit(3), on_exit(3), termios(3)

COLOPHON

       This page is part of release 3.27 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								    2010-09-20								  _EXIT(2)