1/* Internal pthread_atfork definitions.
2 Copyright (C) 2021-2022 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, see
17 <https://www.gnu.org/licenses/>. */
18
19#ifndef _REGISTER_ATFORK_H
20#define _REGISTER_ATFORK_H
21
22/* Elements of the fork handler lists. */
23struct fork_handler
24{
25 void (*prepare_handler) (void);
26 void (*parent_handler) (void);
27 void (*child_handler) (void);
28 void *dso_handle;
29 uint64_t id;
30};
31
32/* Function to call to unregister fork handlers. */
33extern void __unregister_atfork (void *dso_handle) attribute_hidden;
34#define UNREGISTER_ATFORK(dso_handle) __unregister_atfork (dso_handle)
35
36enum __run_fork_handler_type
37{
38 atfork_run_prepare,
39 atfork_run_child,
40 atfork_run_parent
41};
42
43/* Run the atfork prepare handlers in the reverse order of registration and
44 return the ID of the last registered handler. If DO_LOCKING is true, the
45 internal lock is held locked upon return. */
46extern uint64_t __run_prefork_handlers (_Bool do_locking) attribute_hidden;
47
48/* Given a handler type (parent or child), run all the atfork handlers in
49 the order of registration up to and including the handler with id equal
50 to LASTRUN. If DO_LOCKING is true, the internal lock is unlocked prior
51 to return. */
52extern void __run_postfork_handlers (enum __run_fork_handler_type who,
53 _Bool do_locking,
54 uint64_t lastrun) attribute_hidden;
55
56/* C library side function to register new fork handlers. */
57extern int __register_atfork (void (*__prepare) (void),
58 void (*__parent) (void),
59 void (*__child) (void),
60 void *dso_handle);
61libc_hidden_proto (__register_atfork)
62
63#endif
64