1/*	$NetBSD: notifier.h,v 1.5 2021/12/19 11:47:08 riastradh Exp $	*/
2
3/*-
4 * Copyright (c) 2013 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Taylor R. Campbell.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32#ifndef _LINUX_NOTIFIER_H_
33#define _LINUX_NOTIFIER_H_
34
35#include <sys/cdefs.h>
36
37#include <sys/pslist.h>
38
39#include <linux/spinlock.h>
40
41/* namespace */
42#define	ATOMIC_INIT_NOTIFIER_HEAD	linux_ATOMIC_INIT_NOTIFIER_HEAD
43#define	ATOMIC_CLEANUP_NOTIFIER_HEAD	linux_ATOMIC_CLEANUP_NOTIFIER_HEAD
44#define	atomic_notifier_call_chain	linux_atomic_notifier_call_chain
45#define	atomic_notifier_chain_register	linux_atomic_notifier_chain_register
46#define	atomic_notifier_chain_unregister linux_atomic_notifier_chain_unregister
47
48#define	NOTIFY_DONE	0
49#define	NOTIFY_OK	1
50
51struct notifier_block {
52	int (*notifier_call)(struct notifier_block *, unsigned long, void *);
53	struct pslist_entry	nb_entry;
54};
55
56struct atomic_notifier_head {
57	spinlock_t		anh_lock;
58	struct pslist_head	anh_list;
59};
60
61void ATOMIC_INIT_NOTIFIER_HEAD(struct atomic_notifier_head *);
62void ATOMIC_CLEANUP_NOTIFIER_HEAD(struct atomic_notifier_head *);
63
64void atomic_notifier_chain_register(struct atomic_notifier_head *,
65    struct notifier_block *);
66void atomic_notifier_chain_unregister(struct atomic_notifier_head *,
67    struct notifier_block *);
68void atomic_notifier_call_chain(struct atomic_notifier_head *, unsigned long,
69    void *);
70
71#endif  /* _LINUX_NOTIFIER_H_ */
72