stdlib/exit.c

   1 /* Copyright (C) 1991, 1995, 1996 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
  16 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  17 Cambridge, MA 02139, 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 }