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   /* First, call the TLS destructors.  */
  37   __call_tls_dtors ();
  38
  39   /* We do it this way to handle recursive calls to exit () made by
  40      the functions registered with `atexit' and `on_exit'. We call
  41      everyone on the list and use the status value in the last
  42      exit (). */
  43   while (*listp != NULL)
  44     {
  45       struct exit_function_list *cur = *listp;
  46
  47       while (cur->idx > 0)
  48         {
  49           const struct exit_function *const f =
  50             &cur->fns[--cur->idx];
  51           switch (f->flavor)
  52             {
  53               void (*atfct) (void);
  54               void (*onfct) (int status, void *arg);
  55               void (*cxafct) (void *arg, int status);
  56
  57             case ef_free:
  58             case ef_us:
  59               break;
  60             case ef_on:
  61               onfct = f->func.on.fn;
  62 #ifdef PTR_DEMANGLE
  63               PTR_DEMANGLE (onfct);
  64 #endif
  65               onfct (status, f->func.on.arg);
  66               break;
  67             case ef_at:
  68               atfct = f->func.at;
  69 #ifdef PTR_DEMANGLE
  70               PTR_DEMANGLE (atfct);
  71 #endif
  72               atfct ();
  73               break;
  74             case ef_cxa:
  75               cxafct = f->func.cxa.fn;
  76 #ifdef PTR_DEMANGLE
  77               PTR_DEMANGLE (cxafct);
  78 #endif
  79               cxafct (f->func.cxa.arg, status);
  80               break;
  81             }
  82         }
  83
  84       *listp = cur->next;
  85       if (*listp != NULL)
  86         /* Don't free the last element in the chain, this is the statically
  87            allocate element.  */
  88         free (cur);
  89     }
  90
  91   if (run_list_atexit)
  92     RUN_HOOK (__libc_atexit, ());
  93
  94   _exit (status);
  95 }
  96
  97
  98 void
  99 exit (int status)
 100 {
 101   __run_exit_handlers (status, &__exit_funcs, true);
 102 }
 103 libc_hidden_def (exit)