/* Copyright (C) 1991-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or

   modify it under the terms of the GNU Lesser General Public

   License as published by the Free Software Foundation; either

   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public

   License along with the GNU C Library; if not, see

   <http://www.gnu.org/licenses/>.  */

#ifndef	_EXIT_H

#define _EXIT_H 1

#include <stdbool.h>

#include <stdint.h>

#include <libc-lock.h>

enum

{

  ef_free,	/* `ef_free' MUST be zero!  */

  ef_us,

  ef_on,

  ef_at,

  ef_cxa

};

struct exit_function

  {

    /* `flavour' should be of type of the `enum' above but since we need

       this element in an atomic operation we have to use `long int'.  */

    long int flavor;

    union

      {

	void (*at) (void);

	struct

	  {

	    void (*fn) (int status, void *arg);

	    void *arg;

	  } on;

	struct

	  {

	    void (*fn) (void *arg, int status);

	    void *arg;

	    void *dso_handle;

	  } cxa;

      } func;

  };

struct exit_function_list

  {

    struct exit_function_list *next;

    size_t idx;

    struct exit_function fns[32];

  };

extern struct exit_function_list *__exit_funcs attribute_hidden;

extern struct exit_function_list *__quick_exit_funcs attribute_hidden;

extern uint64_t __new_exitfn_called attribute_hidden;

/* True once all registered atexit/at_quick_exit/onexit handlers have been

   called */

extern bool __exit_funcs_done attribute_hidden;

/* This lock protects __exit_funcs, __quick_exit_funcs, __exit_funcs_done

   and __new_exitfn_called globals against simultaneous access from

   atexit/on_exit/at_quick_exit in multiple threads, and also from

   simultaneous access while another thread is in the middle of calling

   exit handlers.  See BZ#14333.  Note: for lists, the entire list, and

   each associated entry in the list, is protected for all access by this

   lock.  */

__libc_lock_define (extern, __exit_funcs_lock);

extern struct exit_function *__new_exitfn (struct exit_function_list **listp)

  attribute_hidden;

extern void __run_exit_handlers (int status,

				 struct exit_function_list **listp,

				 bool run_list_atexit, bool run_dtors)

  attribute_hidden __attribute__ ((__noreturn__));

extern int __internal_atexit (void (*func) (void *), void *arg, void *d,

			      struct exit_function_list **listp)

  attribute_hidden;

extern int __cxa_at_quick_exit (void (*func) (void *), void *d);

#endif	/* exit.h  */