| xf.li | bfc6e71 | 2025-02-07 01:54:34 -0800 | [diff] [blame^] | 1 | /* Copyright (C) 2002-2016 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; |