| /* Copyright (C) 2002-2014 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| Contributed by Ulrich Drepper <drepper@redhat.com>, 2002. |
| |
| 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/>. */ |
| |
| #include <lowlevellock.h> |
| |
| /* The fork generation counter, defined in libpthread. */ |
| extern unsigned long int __fork_generation attribute_hidden; |
| |
| /* Pointer to the fork generation counter in the thread library. */ |
| extern unsigned long int *__fork_generation_pointer attribute_hidden; |
| |
| /* Lock to protect allocation and deallocation of fork handlers. */ |
| extern int __fork_lock attribute_hidden; |
| |
| /* Elements of the fork handler lists. */ |
| struct fork_handler |
| { |
| struct fork_handler *next; |
| void (*prepare_handler) (void); |
| void (*parent_handler) (void); |
| void (*child_handler) (void); |
| void *dso_handle; |
| unsigned int refcntr; |
| int need_signal; |
| }; |
| |
| /* The single linked list of all currently registered for handlers. */ |
| extern struct fork_handler *__fork_handlers attribute_hidden; |
| |
| |
| /* Function to call to unregister fork handlers. */ |
| extern void __unregister_atfork (void *dso_handle) attribute_hidden; |
| #define UNREGISTER_ATFORK(dso_handle) __unregister_atfork (dso_handle) |
| |
| |
| /* C library side function to register new fork handlers. */ |
| extern int __register_atfork (void (*__prepare) (void), |
| void (*__parent) (void), |
| void (*__child) (void), |
| void *dso_handle); |
| libc_hidden_proto (__register_atfork) |
| |
| /* Add a new element to the fork list. */ |
| extern void __linkin_atfork (struct fork_handler *newp) attribute_hidden; |