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