Rev 422 | Details | Compare with Previous | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 422 | giacomo | 1 | /* |
| 2 | * Routines to manage notifier chains for passing status changes to any |
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| 3 | * interested routines. We need this instead of hard coded call lists so |
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| 4 | * that modules can poke their nose into the innards. The network devices |
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| 5 | * needed them so here they are for the rest of you. |
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| 6 | * |
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| 7 | * Alan Cox <Alan.Cox@linux.org> |
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| 8 | */ |
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| 9 | |||
| 10 | #ifndef _LINUX_NOTIFIER_H |
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| 11 | #define _LINUX_NOTIFIER_H |
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| 12 | #include <linux/errno.h> |
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| 13 | |||
| 14 | struct notifier_block |
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| 15 | { |
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| 16 | int (*notifier_call)(struct notifier_block *self, unsigned long, void *); |
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| 17 | struct notifier_block *next; |
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| 18 | int priority; |
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| 19 | }; |
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| 20 | |||
| 21 | |||
| 22 | #ifdef __KERNEL__ |
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| 23 | |||
| 24 | extern int notifier_chain_register(struct notifier_block **list, struct notifier_block *n); |
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| 25 | extern int notifier_chain_unregister(struct notifier_block **nl, struct notifier_block *n); |
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| 26 | extern int notifier_call_chain(struct notifier_block **n, unsigned long val, void *v); |
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| 27 | |||
| 28 | #define NOTIFY_DONE 0x0000 /* Don't care */ |
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| 29 | #define NOTIFY_OK 0x0001 /* Suits me */ |
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| 30 | #define NOTIFY_STOP_MASK 0x8000 /* Don't call further */ |
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| 31 | #define NOTIFY_BAD (NOTIFY_STOP_MASK|0x0002) /* Bad/Veto action */ |
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| 32 | |||
| 33 | /* |
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| 34 | * Declared notifiers so far. I can imagine quite a few more chains |
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| 35 | * over time (eg laptop power reset chains, reboot chain (to clean |
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| 36 | * device units up), device [un]mount chain, module load/unload chain, |
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| 37 | * low memory chain, screenblank chain (for plug in modular screenblankers) |
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| 38 | * VC switch chains (for loadable kernel svgalib VC switch helpers) etc... |
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| 39 | */ |
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| 40 | |||
| 41 | /* netdevice notifier chain */ |
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| 42 | #define NETDEV_UP 0x0001 /* For now you can't veto a device up/down */ |
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| 43 | #define NETDEV_DOWN 0x0002 |
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| 44 | #define NETDEV_REBOOT 0x0003 /* Tell a protocol stack a network interface |
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| 45 | detected a hardware crash and restarted |
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| 46 | - we can use this eg to kick tcp sessions |
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| 47 | once done */ |
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| 48 | #define NETDEV_CHANGE 0x0004 /* Notify device state change */ |
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| 49 | #define NETDEV_REGISTER 0x0005 |
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| 50 | #define NETDEV_UNREGISTER 0x0006 |
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| 51 | #define NETDEV_CHANGEMTU 0x0007 |
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| 52 | #define NETDEV_CHANGEADDR 0x0008 |
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| 53 | #define NETDEV_GOING_DOWN 0x0009 |
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| 54 | #define NETDEV_CHANGENAME 0x000A |
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| 55 | |||
| 56 | #define SYS_DOWN 0x0001 /* Notify of system down */ |
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| 57 | #define SYS_RESTART SYS_DOWN |
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| 58 | #define SYS_HALT 0x0002 /* Notify of system halt */ |
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| 59 | #define SYS_POWER_OFF 0x0003 /* Notify of system power off */ |
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| 60 | |||
| 61 | #define NETLINK_URELEASE 0x0001 /* Unicast netlink socket released */ |
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| 62 | |||
| 63 | #define CPU_ONLINE 0x0002 /* CPU (unsigned)v is up */ |
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| 64 | #define CPU_UP_PREPARE 0x0003 /* CPU (unsigned)v coming up */ |
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| 65 | #define CPU_UP_CANCELED 0x0004 /* CPU (unsigned)v NOT coming up */ |
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| 66 | #define CPU_OFFLINE 0x0005 /* CPU (unsigned)v offline (still scheduling) */ |
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| 67 | #define CPU_DEAD 0x0006 /* CPU (unsigned)v dead */ |
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| 68 | |||
| 69 | #endif /* __KERNEL__ */ |
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| 70 | #endif /* _LINUX_NOTIFIER_H */ |