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att
GitHub Repository: att/ast
 Path: blob/master/src/lib/libast/comp/atexit.c
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/***********************************************************************

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*                                                                      *

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*               This software is part of the ast package               *

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*          Copyright (c) 1985-2011 AT&T Intellectual Property          *

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*                      and is licensed under the                       *

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*                 Eclipse Public License, Version 1.0                  *

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*                    by AT&T Intellectual Property                     *

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*                                                                      *

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*                A copy of the License is available at                 *

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*          http://www.eclipse.org/org/documents/epl-v10.html           *

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*         (with md5 checksum b35adb5213ca9657e911e9befb180842)         *

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*                                                                      *

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*              Information and Software Systems Research               *

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*                            AT&T Research                             *

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*                           Florham Park NJ                            *

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*                                                                      *

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*                 Glenn Fowler <[email protected]>                  *

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*                  David Korn <[email protected]>                   *

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*                   Phong Vo <[email protected]>                    *

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*                                                                      *

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***********************************************************************/

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#pragma prototyped

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/*

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 * ANSI C atexit()

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 * arrange for func to be called LIFO on exit()

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 */

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#include <ast.h>

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#if _lib_atexit

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NoN(atexit)

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#else

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#if _lib_onexit || _lib_on_exit

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#if !_lib_onexit

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#define onexit		on_exit

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#endif

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extern int		onexit(void(*)(void));

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int

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atexit(void (*func)(void))

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{

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	return(onexit(func));

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}

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#else

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struct list

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{

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	struct list*	next;

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	void		(*func)(void);

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};

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static struct list*	funclist;

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extern void		_exit(int);

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int

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atexit(void (*func)(void))

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{

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	register struct list*	p;

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	if (!(p = newof(0, struct list, 1, 0))) return(-1);

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	p->func = func;

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	p->next = funclist;

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	funclist = p;

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	return(0);

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}

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void

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_ast_atexit(void)

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{

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	register struct list*	p;

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	while (p = funclist)

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	{

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		funclist = p->next;

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		(*p->func)();

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	}

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}

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#if _std_cleanup

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#if _lib__cleanup

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extern void		_cleanup(void);

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#endif

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void

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exit(int code)

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{

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	_ast_atexit();

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#if _lib__cleanup

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	_cleanup();

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#endif

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	_exit(code);

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}

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#else

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void

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_cleanup(void)

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{

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	_ast_atexit();

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}

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#endif

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#endif

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#endif

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