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/* Copyright (C) 2002-2021 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
<https://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;
/* Elements of the fork handler lists. */
struct fork_handler
{
void (*prepare_handler) (void);
void (*parent_handler) (void);
void (*child_handler) (void);
void *dso_handle;
};
/* 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)
enum __run_fork_handler_type
{
atfork_run_prepare,
atfork_run_child,
atfork_run_parent
};
/* Run the atfork handlers and lock/unlock the internal lock depending
of the WHO argument:
- atfork_run_prepare: run all the PREPARE_HANDLER in reverse order of
insertion and locks the internal lock.
- atfork_run_child: run all the CHILD_HANDLER and unlocks the internal
lock.
- atfork_run_parent: run all the PARENT_HANDLER and unlocks the internal
lock.
Perform locking only if DO_LOCKING. */
extern void __run_fork_handlers (enum __run_fork_handler_type who,
_Bool do_locking) attribute_hidden;
/* 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)
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