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   /* We do it this way to handle recursive calls to exit () made by
  37      the functions registered with `atexit' and `on_exit'. We call
  38      everyone on the list and use the status value in the last
  39      exit (). */
  40   for (; __exit_funcs; __exit_funcs = __exit_funcs->next)
  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             }
  58         }
  59     }
  60
  61 #ifdef  HAVE_GNU_LD
  62   RUN_HOOK (__libc_atexit, ());
  63 #else
  64   {
  65     extern void _cleanup (void);
  66     _cleanup ();
  67   }
  68 #endif
  69
  70   _exit (status);
  71 }