1 /*
2 * Routines to manage notifier chains for passing status changes to any
3 * interested routines. We need this instead of hard coded call lists so
4 * that modules can poke their nose into the innards. The network devices
5 * needed them so here they are for the rest of you.
6 *
7 * Alan Cox <Alan.Cox@linux.org>
8 */
9
10 #ifndef _LINUX_NOTIFIER_H
11 #define _LINUX_NOTIFIER_H
12 #include <linux/errno.h>
13
14 struct notifier_block
15 {
16 int (*notifier_call)(struct notifier_block *self, unsigned long, void *);
17 struct notifier_block *next;
18 int priority;
19 };
20
21
22 #ifdef __KERNEL__
23
24 extern int notifier_chain_register(struct notifier_block **list, struct notifier_block *n);
25 extern int notifier_chain_unregister(struct notifier_block **nl, struct notifier_block *n);
26 extern int notifier_call_chain(struct notifier_block **n, unsigned long val, void *v);
27
28 #define NOTIFY_DONE 0x0000 /* Don't care */
29 #define NOTIFY_OK 0x0001 /* Suits me */
30 #define NOTIFY_STOP_MASK 0x8000 /* Don't call further */
31 #define NOTIFY_BAD (NOTIFY_STOP_MASK|0x0002) /* Bad/Veto action */
32
33 /*
34 * Declared notifiers so far. I can imagine quite a few more chains
35 * over time (eg laptop power reset chains, reboot chain (to clean
36 * device units up), device [un]mount chain, module load/unload chain,
37 * low memory chain, screenblank chain (for plug in modular screenblankers)
38 * VC switch chains (for loadable kernel svgalib VC switch helpers) etc...
39 */
40
41 /* netdevice notifier chain */
42 #define NETDEV_UP 0x0001 /* For now you can't veto a device up/down */
43 #define NETDEV_DOWN 0x0002
44 #define NETDEV_REBOOT 0x0003 /* Tell a protocol stack a network interface
45 detected a hardware crash and restarted
46 - we can use this eg to kick tcp sessions
47 once done */
48 #define NETDEV_CHANGE 0x0004 /* Notify device state change */
49 #define NETDEV_REGISTER 0x0005
50 #define NETDEV_UNREGISTER 0x0006
51 #define NETDEV_CHANGEMTU 0x0007
52 #define NETDEV_CHANGEADDR 0x0008
53 #define NETDEV_GOING_DOWN 0x0009
54 #define NETDEV_CHANGENAME 0x000A
55
56 #define SYS_DOWN 0x0001 /* Notify of system down */
57 #define SYS_RESTART SYS_DOWN
58 #define SYS_HALT 0x0002 /* Notify of system halt */
59 #define SYS_POWER_OFF 0x0003 /* Notify of system power off */
60
61 #endif /* __KERNEL__ */
62 #endif /* _LINUX_NOTIFIER_H */
63
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