stdlib/exit.c

   1 /* Copyright (C) 1991,95,96,97,99,2001,2002,2005 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 Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the 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    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 #include <stdio.h>
  20 #include <stdlib.h>
  21 #include <unistd.h>
  22 #include "exit.h"
  23
  24 #include "set-hooks.h"
  25 DEFINE_HOOK (__libc_atexit, (void))
  26
  27
  28 /* Call all functions registered with `atexit' and `on_exit',
  29    in the reverse of the order in which they were registered
  30    perform stdio cleanup, and terminate program execution with STATUS.  */
  31 void
  32 exit (int status)
  33 {
  34   /* We do it this way to handle recursive calls to exit () made by
  35      the functions registered with `atexit' and `on_exit'. We call
  36      everyone on the list and use the status value in the last
  37      exit (). */
  38   while (__exit_funcs != NULL)
  39     {
  40       struct exit_function_list *old;
  41
  42       while (__exit_funcs->idx > 0)
  43         {
  44           const struct exit_function *const f =
  45             &__exit_funcs->fns[--__exit_funcs->idx];
  46           switch (f->flavor)
  47             {
  48             case ef_free:
  49             case ef_us:
  50               break;
  51             case ef_on:
  52               (*f->func.on.fn) (status, f->func.on.arg);
  53               break;
  54             case ef_at:
  55               (*f->func.at) ();
  56               break;
  57             case ef_cxa:
  58               (*f->func.cxa.fn) (f->func.cxa.arg, status);
  59               break;
  60             }
  61         }
  62
  63       old = __exit_funcs;
  64       __exit_funcs = __exit_funcs->next;
  65       if (__exit_funcs != NULL)
  66         /* Don't free the last element in the chain, this is the statically
  67            allocate element.  */
  68         free (old);
  69     }
  70
  71   RUN_HOOK (__libc_atexit, ());
  72
  73   _exit (status);
  74 }
  75 libc_hidden_def (exit)