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/* Copyright (C) 2002-2017 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;
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