stdlib/exit.h

   1 /* Copyright (C) 1991,1996,1997,1999,2001,2002,2006,2009
   2    Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #ifndef _EXIT_H
  21 #define _EXIT_H 1
  22
  23 #include <stdbool.h>
  24 #include <stdint.h>
  25
  26 enum
  27 {
  28   ef_free,      /* `ef_free' MUST be zero!  */
  29   ef_us,
  30   ef_on,
  31   ef_at,
  32   ef_cxa
  33 };
  34
  35 struct exit_function
  36   {
  37     /* `flavour' should be of type of the `enum' above but since we need
  38        this element in an atomic operation we have to use `long int'.  */
  39     long int flavor;
  40     union
  41       {
  42         void (*at) (void);
  43         struct
  44           {
  45             void (*fn) (int status, void *arg);
  46             void *arg;
  47           } on;
  48         struct
  49           {
  50             void (*fn) (void *arg, int status);
  51             void *arg;
  52             void *dso_handle;
  53           } cxa;
  54       } func;
  55   };
  56 struct exit_function_list
  57   {
  58     struct exit_function_list *next;
  59     size_t idx;
  60     struct exit_function fns[32];
  61   };
  62 extern struct exit_function_list *__exit_funcs attribute_hidden;
  63 extern struct exit_function_list *__quick_exit_funcs attribute_hidden;
  64
  65 extern struct exit_function *__new_exitfn (struct exit_function_list **listp);
  66 extern uint64_t __new_exitfn_called attribute_hidden;
  67
  68 extern void __run_exit_handlers (int status, struct exit_function_list **listp,
  69                                  bool run_list_atexit)
  70   attribute_hidden __attribute__ ((__noreturn__));
  71
  72 extern int __internal_atexit (void (*func) (void *), void *arg, void *d,
  73                               struct exit_function_list **listp)
  74   attribute_hidden;
  75 extern int __cxa_at_quick_exit (void (*func) (void *), void *d);
  76
  77
  78 #endif  /* exit.h  */