stdlib/exit.c

   1 /* Copyright (C) 1991, 1995, 1996, 1997 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Library General Public License as
   6    published by the Free Software Foundation; either version 2 of the
   7    License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Library General Public License for more details.
  13
  14    You should have received a copy of the GNU Library General Public
  15    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  16    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17    Boston, MA 02111-1307, USA.  */
  18
  19 #include <stdio.h>
  20 #include <stdlib.h>
  21 #include <unistd.h>
  22 #include "exit.h"
  23
  24 #ifdef HAVE_GNU_LD
  25 #include "set-hooks.h"
  26 DEFINE_HOOK (__libc_atexit, (void))
  27 #endif
  28
  29
  30 /* Call all functions registered with `atexit' and `on_exit',
  31    in the reverse of the order in which they were registered
  32    perform stdio cleanup, and terminate program execution with STATUS.  */
  33 void
  34 exit (int status)
  35 {
  36   const struct exit_function_list *l;
  37
  38   for (l = __exit_funcs; l != NULL; l = l->next)
  39     {
  40       size_t i = l->idx;
  41       while (i-- > 0)
  42         {
  43           const struct exit_function *const f = &l->fns[i];
  44           switch (f->flavor)
  45             {
  46             case ef_free:
  47             case ef_us:
  48               break;
  49             case ef_on:
  50               (*f->func.on.fn) (status, f->func.on.arg);
  51               break;
  52             case ef_at:
  53               (*f->func.at) ();
  54               break;
  55             }
  56         }
  57     }
  58
  59 #ifdef  HAVE_GNU_LD
  60   RUN_HOOK (__libc_atexit, ());
  61 #else
  62   {
  63     extern void _cleanup (void);
  64     _cleanup ();
  65   }
  66 #endif
  67
  68   _exit (status);
  69 }