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 * Clean way to return from the notifier and stop further calls.
34 */
35 #define NOTIFY_STOP (NOTIFY_OK|NOTIFY_STOP_MASK)
36
37 /*
38 * Declared notifiers so far. I can imagine quite a few more chains
39 * over time (eg laptop power reset chains, reboot chain (to clean
40 * device units up), device [un]mount chain, module load/unload chain,
41 * low memory chain, screenblank chain (for plug in modular screenblankers)
42 * VC switch chains (for loadable kernel svgalib VC switch helpers) etc...
43 */
44
45 /* netdevice notifier chain */
46 #define NETDEV_UP 0x0001 /* For now you can't veto a device up/down */
47 #define NETDEV_DOWN 0x0002
48 #define NETDEV_REBOOT 0x0003 /* Tell a protocol stack a network interface
49 detected a hardware crash and restarted
50 - we can use this eg to kick tcp sessions
51 once done */
52 #define NETDEV_CHANGE 0x0004 /* Notify device state change */
53 #define NETDEV_REGISTER 0x0005
54 #define NETDEV_UNREGISTER 0x0006
55 #define NETDEV_CHANGEMTU 0x0007
56 #define NETDEV_CHANGEADDR 0x0008
57 #define NETDEV_GOING_DOWN 0x0009
58 #define NETDEV_CHANGENAME 0x000A
59
60 #define SYS_DOWN 0x0001 /* Notify of system down */
61 #define SYS_RESTART SYS_DOWN
62 #define SYS_HALT 0x0002 /* Notify of system halt */
63 #define SYS_POWER_OFF 0x0003 /* Notify of system power off */
64
65 #define NETLINK_URELEASE 0x0001 /* Unicast netlink socket released */
66
67 #define CPU_ONLINE 0x0002 /* CPU (unsigned)v is up */
68 #define CPU_UP_PREPARE 0x0003 /* CPU (unsigned)v coming up */
69 #define CPU_UP_CANCELED 0x0004 /* CPU (unsigned)v NOT coming up */
70 #define CPU_DOWN_PREPARE 0x0005 /* CPU (unsigned)v going down */
71 #define CPU_DOWN_FAILED 0x0006 /* CPU (unsigned)v NOT going down */
72 #define CPU_DEAD 0x0007 /* CPU (unsigned)v dead */
73
74 #endif /* __KERNEL__ */
75 #endif /* _LINUX_NOTIFIER_H */
76
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