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/*
* Copyright (c) 1990 Regents of the University of California.
* All rights reserved.
*
* %sccs.include.redist.c%
*/
/*
FUNCTION
<<exit>>---end program execution
INDEX
exit
ANSI_SYNOPSIS
#include <stdlib.h>
void exit(int <[code]>);
TRAD_SYNOPSIS
#include <stdlib.h>
void exit(<[code]>)
int <[code]>;
DESCRIPTION
Use <<exit>> to return control from a program to the host operating
environment. Use the argument <[code]> to pass an exit status to the
operating environment: two particular values, <<EXIT_SUCCESS>> and
<<EXIT_FAILURE>>, are defined in `<<stdlib.h>>' to indicate success or
failure in a portable fashion.
<<exit>> does two kinds of cleanup before ending execution of your
program. First, it calls all application-defined cleanup functions
you have enrolled with <<atexit>>. Second, files and streams are
cleaned up: any pending output is delivered to the host system, each
open file or stream is closed, and files created by <<tmpfile>> are
deleted.
RETURNS
<<exit>> does not return to its caller.
PORTABILITY
ANSI C requires <<exit>>, and specifies that <<EXIT_SUCCESS>> and
<<EXIT_FAILURE>> must be defined.
Supporting OS subroutines required: <<_exit>>.
*/
#include <stdlib.h>
#include <unistd.h> /* for _exit() declaration */
#include <reent.h>
#ifndef _REENT_ONLY
/*
* Exit, flushing stdio buffers if necessary.
*/
void
_DEFUN (exit, (code),
int code)
{
register struct _atexit *p;
register struct _on_exit_args * args;
register int n;
int i;
#ifdef _REENT_SMALL
p = &_GLOBAL_REENT->_atexit;
args = p->_on_exit_args_ptr;
if (args == NULL)
{
for (n = p->_ind; n--;)
p->_fns[n] ();
}
else
{
for (n = p->_ind - 1, i = (n >= 0) ? (1 << n) : 0; n >= 0; --n, i >>= 1)
if (args->_fntypes & i)
(*((void (*)(int, void *)) p->_fns[n]))(code, args->_fnargs[n]);
else
p->_fns[n] ();
}
#else
p = _GLOBAL_REENT->_atexit;
do
{
args = & p->_on_exit_args;
for (n = p->_ind - 1, i = (n >= 0) ? (1 << n) : 0; n >= 0; --n, i >>= 1)
if (args->_fntypes & i)
(*((void (*)(int, void *)) p->_fns[n]))(code, args->_fnargs[n]);
else
p->_fns[n] ();
p = p->_next;
}
while (p);
#endif
if (_GLOBAL_REENT->__cleanup)
(*_GLOBAL_REENT->__cleanup) (_GLOBAL_REENT);
_exit (code);
}
#endif
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