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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  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 pro-
       cess.

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 3.22 of the Linux man-pages project.  A description of the project, and informa-
       tion about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.



Linux                             2008-11-27                          _EXIT(2)