#ifndef _LINUX_NOTIFIER_H
#define _LINUX_NOTIFIER_H
#include <linux/errno.h>
-#include <linux/mutex.h>
-#include <linux/rwsem.h>
-/*
- * Notifier chains are of three types:
- *
- * Atomic notifier chains: Chain callbacks run in interrupt/atomic
- * context. Callouts are not allowed to block.
- * Blocking notifier chains: Chain callbacks run in process context.
- * Callouts are allowed to block.
- * Raw notifier chains: There are no restrictions on callbacks,
- * registration, or unregistration. All locking and protection
- * must be provided by the caller.
- *
- * atomic_notifier_chain_register() may be called from an atomic context,
- * but blocking_notifier_chain_register() must be called from a process
- * context. Ditto for the corresponding _unregister() routines.
- *
- * atomic_notifier_chain_unregister() and blocking_notifier_chain_unregister()
- * _must not_ be called from within the call chain.
- */
-
-struct notifier_block {
- int (*notifier_call)(struct notifier_block *, unsigned long, void *);
+struct notifier_block
+{
+ int (*notifier_call)(struct notifier_block *self, unsigned long, void *);
struct notifier_block *next;
int priority;
};
-struct atomic_notifier_head {
- spinlock_t lock;
- struct notifier_block *head;
-};
-
-struct blocking_notifier_head {
- struct rw_semaphore rwsem;
- struct notifier_block *head;
-};
-
-struct raw_notifier_head {
- struct notifier_block *head;
-};
-
-#define ATOMIC_INIT_NOTIFIER_HEAD(name) do { \
- spin_lock_init(&(name)->lock); \
- (name)->head = NULL; \
- } while (0)
-#define BLOCKING_INIT_NOTIFIER_HEAD(name) do { \
- init_rwsem(&(name)->rwsem); \
- (name)->head = NULL; \
- } while (0)
-#define RAW_INIT_NOTIFIER_HEAD(name) do { \
- (name)->head = NULL; \
- } while (0)
-
-#define ATOMIC_NOTIFIER_INIT(name) { \
- .lock = SPIN_LOCK_UNLOCKED, \
- .head = NULL }
-#define BLOCKING_NOTIFIER_INIT(name) { \
- .rwsem = __RWSEM_INITIALIZER((name).rwsem), \
- .head = NULL }
-#define RAW_NOTIFIER_INIT(name) { \
- .head = NULL }
-
-#define ATOMIC_NOTIFIER_HEAD(name) \
- struct atomic_notifier_head name = \
- ATOMIC_NOTIFIER_INIT(name)
-#define BLOCKING_NOTIFIER_HEAD(name) \
- struct blocking_notifier_head name = \
- BLOCKING_NOTIFIER_INIT(name)
-#define RAW_NOTIFIER_HEAD(name) \
- struct raw_notifier_head name = \
- RAW_NOTIFIER_INIT(name)
#ifdef __KERNEL__
-extern int atomic_notifier_chain_register(struct atomic_notifier_head *,
- struct notifier_block *);
-extern int blocking_notifier_chain_register(struct blocking_notifier_head *,
- struct notifier_block *);
-extern int raw_notifier_chain_register(struct raw_notifier_head *,
- struct notifier_block *);
-
-extern int atomic_notifier_chain_unregister(struct atomic_notifier_head *,
- struct notifier_block *);
-extern int blocking_notifier_chain_unregister(struct blocking_notifier_head *,
- struct notifier_block *);
-extern int raw_notifier_chain_unregister(struct raw_notifier_head *,
- struct notifier_block *);
-
-extern int atomic_notifier_call_chain(struct atomic_notifier_head *,
- unsigned long val, void *v);
-extern int blocking_notifier_call_chain(struct blocking_notifier_head *,
- unsigned long val, void *v);
-extern int raw_notifier_call_chain(struct raw_notifier_head *,
- unsigned long val, void *v);
+extern int notifier_chain_register(struct notifier_block **list, struct notifier_block *n);
+extern int notifier_chain_unregister(struct notifier_block **nl, struct notifier_block *n);
+extern int notifier_call_chain(struct notifier_block **n, unsigned long val, void *v);
#define NOTIFY_DONE 0x0000 /* Don't care */
#define NOTIFY_OK 0x0001 /* Suits me */
#define NOTIFY_STOP_MASK 0x8000 /* Don't call further */
-#define NOTIFY_BAD (NOTIFY_STOP_MASK|0x0002)
- /* Bad/Veto action */
+#define NOTIFY_BAD (NOTIFY_STOP_MASK|0x0002) /* Bad/Veto action */
/*
* Clean way to return from the notifier and stop further calls.
*/