1_EXIT(2)                   Linux Programmer's Manual                  _EXIT(2)
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NAME

6       _exit, _Exit - terminate the current process
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SYNOPSIS

9       #include <unistd.h>
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11       void _exit(int status);
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13       #include <stdlib.h>
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15       void _Exit(int status);
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DESCRIPTION

18       The  function _exit() terminates the calling process "immediately". Any
19       open file descriptors belonging to the process are closed; any children
20       of the process are inherited by process 1, init, and the process's par‐
21       ent is sent a SIGCHLD signal.
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23       The value status is returned to the parent  process  as  the  process's
24       exit  status,  and  can  be collected using one of the wait() family of
25       calls.
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27       The function _Exit() is equivalent to _exit().
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RETURN VALUE

30       These functions do not return.
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CONFORMING TO

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

37       For  a  discussion  on the effects of an exit, the transmission of exit
38       status, zombie processes, signals sent, etc., see exit(3).
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40       The function _exit() is like exit(), but does not  call  any  functions
41       registered with atexit() or on_exit().  Whether it flushes standard I/O
42       buffers and removes temporary files created with tmpfile(3)  is  imple‐
43       mentation  dependent.   On the other hand, _exit() does close open file
44       descriptors, and this may cause an unknown delay, waiting  for  pending
45       output  to  finish. If the delay is undesired, it may be useful to call
46       functions like tcflush() before calling _exit().  Whether  any  pending
47       I/O  is cancelled, and which pending I/O may be cancelled upon _exit(),
48       is implementation-dependent.
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SEE ALSO

51       execve(2), exit_group(2), fork(2), kill(2),  wait(2),  wait4(2),  wait‐
52       pid(2), atexit(3), exit(3), on_exit(3), termios(3)
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56Linux                             2001-11-17                          _EXIT(2)
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