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10#ifndef _LINUX_NOTIFIER_H
11#define _LINUX_NOTIFIER_H
12#include <linux/errno.h>
13#include <linux/mutex.h>
14#include <linux/rwsem.h>
15#include <linux/srcu.h>
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50typedef int (*notifier_fn_t)(struct notifier_block *nb,
51 unsigned long action, void *data);
52
53struct notifier_block {
54 notifier_fn_t notifier_call;
55 struct notifier_block __rcu *next;
56 int priority;
57};
58
59struct atomic_notifier_head {
60 spinlock_t lock;
61 struct notifier_block __rcu *head;
62};
63
64struct blocking_notifier_head {
65 struct rw_semaphore rwsem;
66 struct notifier_block __rcu *head;
67};
68
69struct raw_notifier_head {
70 struct notifier_block __rcu *head;
71};
72
73struct srcu_notifier_head {
74 struct mutex mutex;
75 struct srcu_struct srcu;
76 struct notifier_block __rcu *head;
77};
78
79#define ATOMIC_INIT_NOTIFIER_HEAD(name) do { \
80 spin_lock_init(&(name)->lock); \
81 (name)->head = NULL; \
82 } while (0)
83#define BLOCKING_INIT_NOTIFIER_HEAD(name) do { \
84 init_rwsem(&(name)->rwsem); \
85 (name)->head = NULL; \
86 } while (0)
87#define RAW_INIT_NOTIFIER_HEAD(name) do { \
88 (name)->head = NULL; \
89 } while (0)
90
91
92extern void srcu_init_notifier_head(struct srcu_notifier_head *nh);
93#define srcu_cleanup_notifier_head(name) \
94 cleanup_srcu_struct(&(name)->srcu);
95
96#define ATOMIC_NOTIFIER_INIT(name) { \
97 .lock = __SPIN_LOCK_UNLOCKED(name.lock), \
98 .head = NULL }
99#define BLOCKING_NOTIFIER_INIT(name) { \
100 .rwsem = __RWSEM_INITIALIZER((name).rwsem), \
101 .head = NULL }
102#define RAW_NOTIFIER_INIT(name) { \
103 .head = NULL }
104
105
106#define ATOMIC_NOTIFIER_HEAD(name) \
107 struct atomic_notifier_head name = \
108 ATOMIC_NOTIFIER_INIT(name)
109#define BLOCKING_NOTIFIER_HEAD(name) \
110 struct blocking_notifier_head name = \
111 BLOCKING_NOTIFIER_INIT(name)
112#define RAW_NOTIFIER_HEAD(name) \
113 struct raw_notifier_head name = \
114 RAW_NOTIFIER_INIT(name)
115
116#ifdef __KERNEL__
117
118extern int atomic_notifier_chain_register(struct atomic_notifier_head *nh,
119 struct notifier_block *nb);
120extern int blocking_notifier_chain_register(struct blocking_notifier_head *nh,
121 struct notifier_block *nb);
122extern int raw_notifier_chain_register(struct raw_notifier_head *nh,
123 struct notifier_block *nb);
124extern int srcu_notifier_chain_register(struct srcu_notifier_head *nh,
125 struct notifier_block *nb);
126
127extern int blocking_notifier_chain_cond_register(
128 struct blocking_notifier_head *nh,
129 struct notifier_block *nb);
130
131extern int atomic_notifier_chain_unregister(struct atomic_notifier_head *nh,
132 struct notifier_block *nb);
133extern int blocking_notifier_chain_unregister(struct blocking_notifier_head *nh,
134 struct notifier_block *nb);
135extern int raw_notifier_chain_unregister(struct raw_notifier_head *nh,
136 struct notifier_block *nb);
137extern int srcu_notifier_chain_unregister(struct srcu_notifier_head *nh,
138 struct notifier_block *nb);
139
140extern int atomic_notifier_call_chain(struct atomic_notifier_head *nh,
141 unsigned long val, void *v);
142extern int __atomic_notifier_call_chain(struct atomic_notifier_head *nh,
143 unsigned long val, void *v, int nr_to_call, int *nr_calls);
144extern int blocking_notifier_call_chain(struct blocking_notifier_head *nh,
145 unsigned long val, void *v);
146extern int __blocking_notifier_call_chain(struct blocking_notifier_head *nh,
147 unsigned long val, void *v, int nr_to_call, int *nr_calls);
148extern int raw_notifier_call_chain(struct raw_notifier_head *nh,
149 unsigned long val, void *v);
150extern int __raw_notifier_call_chain(struct raw_notifier_head *nh,
151 unsigned long val, void *v, int nr_to_call, int *nr_calls);
152extern int srcu_notifier_call_chain(struct srcu_notifier_head *nh,
153 unsigned long val, void *v);
154extern int __srcu_notifier_call_chain(struct srcu_notifier_head *nh,
155 unsigned long val, void *v, int nr_to_call, int *nr_calls);
156
157#define NOTIFY_DONE 0x0000
158#define NOTIFY_OK 0x0001
159#define NOTIFY_STOP_MASK 0x8000
160#define NOTIFY_BAD (NOTIFY_STOP_MASK|0x0002)
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165#define NOTIFY_STOP (NOTIFY_OK|NOTIFY_STOP_MASK)
166
167
168static inline int notifier_from_errno(int err)
169{
170 if (err)
171 return NOTIFY_STOP_MASK | (NOTIFY_OK - err);
172
173 return NOTIFY_OK;
174}
175
176
177static inline int notifier_to_errno(int ret)
178{
179 ret &= ~NOTIFY_STOP_MASK;
180 return ret > NOTIFY_OK ? NOTIFY_OK - ret : 0;
181}
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201#define NETLINK_URELEASE 0x0001
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206#define KBD_KEYCODE 0x0001
207#define KBD_UNBOUND_KEYCODE 0x0002
208#define KBD_UNICODE 0x0003
209#define KBD_KEYSYM 0x0004
210#define KBD_POST_KEYSYM 0x0005
211
212extern struct blocking_notifier_head reboot_notifier_list;
213
214#endif
215#endif
216