stdlib/exit.c

   1 /* Copyright (C) 1991-2013 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, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #include <stdio.h>
  19 #include <stdlib.h>
  20 #include <unistd.h>
  21 #include <sysdep.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 attribute_hidden
  33 __run_exit_handlers (int status, struct exit_function_list **listp,
  34                      bool run_list_atexit)
  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   while (*listp != NULL)
  41     {
  42       struct exit_function_list *cur = *listp;
  43
  44       while (cur->idx > 0)
  45         {
  46           const struct exit_function *const f =
  47             &cur->fns[--cur->idx];
  48           switch (f->flavor)
  49             {
  50               void (*atfct) (void);
  51               void (*onfct) (int status, void *arg);
  52               void (*cxafct) (void *arg, int status);
  53
  54             case ef_free:
  55             case ef_us:
  56               break;
  57             case ef_on:
  58               onfct = f->func.on.fn;
  59 #ifdef PTR_DEMANGLE
  60               PTR_DEMANGLE (onfct);
  61 #endif
  62               onfct (status, f->func.on.arg);
  63               break;
  64             case ef_at:
  65               atfct = f->func.at;
  66 #ifdef PTR_DEMANGLE
  67               PTR_DEMANGLE (atfct);
  68 #endif
  69               atfct ();
  70               break;
  71             case ef_cxa:
  72               cxafct = f->func.cxa.fn;
  73 #ifdef PTR_DEMANGLE
  74               PTR_DEMANGLE (cxafct);
  75 #endif
  76               cxafct (f->func.cxa.arg, status);
  77               break;
  78             }
  79         }
  80
  81       *listp = cur->next;
  82       if (*listp != NULL)
  83         /* Don't free the last element in the chain, this is the statically
  84            allocate element.  */
  85         free (cur);
  86     }
  87
  88   if (run_list_atexit)
  89     RUN_HOOK (__libc_atexit, ());
  90
  91   _exit (status);
  92 }
  93
  94
  95 void
  96 exit (int status)
  97 {
  98   __run_exit_handlers (status, &__exit_funcs, true);
  99 }
 100 libc_hidden_def (exit)