| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame^] | 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 */ |