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      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