stdlib/exit.h

   1 /* Copyright (C) 1991-2017 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 #ifndef _EXIT_H
  19 #define _EXIT_H 1
  20
  21 #include <stdbool.h>
  22 #include <stdint.h>
  23
  24 enum
  25 {
  26   ef_free,      /* `ef_free' MUST be zero!  */
  27   ef_us,
  28   ef_on,
  29   ef_at,
  30   ef_cxa
  31 };
  32
  33 struct exit_function
  34   {
  35     /* `flavour' should be of type of the `enum' above but since we need
  36        this element in an atomic operation we have to use `long int'.  */
  37     long int flavor;
  38     union
  39       {
  40         void (*at) (void);
  41         struct
  42           {
  43             void (*fn) (int status, void *arg);
  44             void *arg;
  45           } on;
  46         struct
  47           {
  48             void (*fn) (void *arg, int status);
  49             void *arg;
  50             void *dso_handle;
  51           } cxa;
  52       } func;
  53   };
  54 struct exit_function_list
  55   {
  56     struct exit_function_list *next;
  57     size_t idx;
  58     struct exit_function fns[32];
  59   };
  60 extern struct exit_function_list *__exit_funcs attribute_hidden;
  61 extern struct exit_function_list *__quick_exit_funcs attribute_hidden;
  62
  63 extern struct exit_function *__new_exitfn (struct exit_function_list **listp);
  64 extern uint64_t __new_exitfn_called attribute_hidden;
  65
  66 extern void __run_exit_handlers (int status,
  67                                  struct exit_function_list **listp,
  68                                  bool run_list_atexit, bool run_dtors)
  69   attribute_hidden __attribute__ ((__noreturn__));
  70
  71 extern int __internal_atexit (void (*func) (void *), void *arg, void *d,
  72                               struct exit_function_list **listp)
  73   attribute_hidden;
  74 extern int __cxa_at_quick_exit (void (*func) (void *), void *d);
  75
  76
  77 #endif  /* exit.h  */