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/* Copyright (C) 1991-2021 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
<https://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 */
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