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atexit.c

/***********************************************************************
*                                                                      *
*               This software is part of the ast package               *
*          Copyright (c) 1985-2008 AT&T Intellectual Property          *
*                      and is licensed under the                       *
*                  Common Public License, Version 1.0                  *
*                    by AT&T Intellectual Property                     *
*                                                                      *
*                A copy of the License is available at                 *
*            http://www.opensource.org/licenses/cpl1.0.txt             *
*         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
*                                                                      *
*              Information and Software Systems Research               *
*                            AT&T Research                             *
*                           Florham Park NJ                            *
*                                                                      *
*                 Glenn Fowler <gsf@research.att.com>                  *
*                  David Korn <dgk@research.att.com>                   *
*                   Phong Vo <kpv@research.att.com>                    *
*                                                                      *
***********************************************************************/
#pragma prototyped

/*
 * ANSI C atexit()
 * arrange for func to be called LIFO on exit()
 */

#include <ast.h>

#if _lib_atexit

NoN(atexit)

#else

#if _lib_onexit || _lib_on_exit

#if !_lib_onexit
#define onexit          on_exit
#endif

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

int
atexit(void (*func)(void))
{
      return(onexit(func));
}

#else

struct list
{
      struct list*      next;
      void        (*func)(void);
};

static struct list*     funclist;

extern void       _exit(int);

int
atexit(void (*func)(void))
{
      register struct list*   p;

      if (!(p = newof(0, struct list, 1, 0))) return(-1);
      p->func = func;
      p->next = funclist;
      funclist = p;
      return(0);
}

void
_ast_atexit(void)
{
      register struct list*   p;

      while (p = funclist)
      {
            funclist = p->next;
            (*p->func)();
      }
}

#if _std_cleanup

#if _lib__cleanup
extern void       _cleanup(void);
#endif

void
exit(int code)
{
      _ast_atexit();
#if _lib__cleanup
      _cleanup();
#endif
      _exit(code);
}

#else

void
_cleanup(void)
{
      _ast_atexit();
}

#endif

#endif

#endif

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