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 51 struct notifier_block { 52 int (*notifier_call)(struct notifier_block *, unsigned long, void *); 53 struct pslist_entry nb_entry; 54 }; 55 56 struct atomic_notifier_head { 57 spinlock_t anh_lock; 58 struct pslist_head anh_list; 59 }; 60 61 void ATOMIC_INIT_NOTIFIER_HEAD(struct atomic_notifier_head *); 62 void ATOMIC_CLEANUP_NOTIFIER_HEAD(struct atomic_notifier_head *); 63 64 void atomic_notifier_chain_register(struct atomic_notifier_head *, 65 struct notifier_block *); 66 void atomic_notifier_chain_unregister(struct atomic_notifier_head *, 67 struct notifier_block *); 68 void atomic_notifier_call_chain(struct atomic_notifier_head *, unsigned long, 69 void *); 70 71 #endif /* _LINUX_NOTIFIER_H_ */ 72