1 | /* Copyright (C) 2002-2018 Free Software Foundation, Inc. |
2 | This file is part of the GNU C Library. |
3 | Contributed by Ulrich Drepper <drepper@redhat.com>, 2002. |
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 | <http://www.gnu.org/licenses/>. */ |
18 | |
19 | #include <lowlevellock.h> |
20 | |
21 | /* The fork generation counter, defined in libpthread. */ |
22 | extern unsigned long int __fork_generation attribute_hidden; |
23 | |
24 | /* Pointer to the fork generation counter in the thread library. */ |
25 | extern unsigned long int *__fork_generation_pointer attribute_hidden; |
26 | |
27 | /* Lock to protect allocation and deallocation of fork handlers. */ |
28 | extern int __fork_lock attribute_hidden; |
29 | |
30 | /* Elements of the fork handler lists. */ |
31 | struct fork_handler |
32 | { |
33 | struct fork_handler *next; |
34 | void (*prepare_handler) (void); |
35 | void (*parent_handler) (void); |
36 | void (*child_handler) (void); |
37 | void *dso_handle; |
38 | unsigned int refcntr; |
39 | int need_signal; |
40 | }; |
41 | |
42 | /* The single linked list of all currently registered for handlers. */ |
43 | extern struct fork_handler *__fork_handlers attribute_hidden; |
44 | |
45 | |
46 | /* Function to call to unregister fork handlers. */ |
47 | extern void __unregister_atfork (void *dso_handle) attribute_hidden; |
48 | #define UNREGISTER_ATFORK(dso_handle) __unregister_atfork (dso_handle) |
49 | |
50 | |
51 | /* C library side function to register new fork handlers. */ |
52 | extern int __register_atfork (void (*__prepare) (void), |
53 | void (*__parent) (void), |
54 | void (*__child) (void), |
55 | void *dso_handle); |
56 | libc_hidden_proto (__register_atfork) |
57 | |
58 | /* Add a new element to the fork list. */ |
59 | extern void __linkin_atfork (struct fork_handler *newp) attribute_hidden; |
60 | |