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 <sysdep.h>
  23 #include "exit.h"
  24
  25 #include "set-hooks.h"
  26 DEFINE_HOOK (__libc_atexit, (void))
  27
  28
  29 /* Call all functions registered with `atexit' and `on_exit',
  30    in the reverse of the order in which they were registered
  31    perform stdio cleanup, and terminate program execution with STATUS.  */
  32 void
  33 exit (int status)
  34 {
  35   /* We do it this way to handle recursive calls to exit () made by
  36      the functions registered with `atexit' and `on_exit'. We call
  37      everyone on the list and use the status value in the last
  38      exit (). */
  39   while (__exit_funcs != NULL)
  40     {
  41       struct exit_function_list *old;
  42
  43       while (__exit_funcs->idx > 0)
  44         {
  45           const struct exit_function *const f =
  46             &__exit_funcs->fns[--__exit_funcs->idx];
  47           switch (f->flavor)
  48             {
  49               void (*atfct) (void);
  50               void (*onfct) (int status, void *arg);
  51               void (*cxafct) (void *arg, int status);
  52
  53             case ef_free:
  54             case ef_us:
  55               break;
  56             case ef_on:
  57               onfct = f->func.on.fn;
  58 #ifdef PTR_DEMANGLE
  59               PTR_DEMANGLE (onfct);
  60 #endif
  61               onfct (status, f->func.on.arg);
  62               break;
  63             case ef_at:
  64               atfct = f->func.at;
  65 #ifdef PTR_DEMANGLE
  66               PTR_DEMANGLE (atfct);
  67 #endif
  68               atfct ();
  69               break;
  70             case ef_cxa:
  71               cxafct = f->func.cxa.fn;
  72 #ifdef PTR_DEMANGLE
  73               PTR_DEMANGLE (cxafct);
  74 #endif
  75               cxafct (f->func.cxa.arg, status);
  76               break;
  77             }
  78         }
  79
  80       old = __exit_funcs;
  81       __exit_funcs = __exit_funcs->next;
  82       if (__exit_funcs != NULL)
  83         /* Don't free the last element in the chain, this is the statically
  84            allocate element.  */
  85         free (old);
  86     }
  87
  88   RUN_HOOK (__libc_atexit, ());
  89
  90   _exit (status);
  91 }
  92 libc_hidden_def (exit)