| /* |
| * Routines to manage notifier chains for passing status changes to any |
| * interested routines. We need this instead of hard coded call lists so |
| * that modules can poke their nose into the innards. The network devices |
| * needed them so here they are for the rest of you. |
| * |
| * Alan Cox <Alan.Cox@linux.org> |
| */ |
| |
| #ifndef _LINUX_NOTIFIER_H |
| #define _LINUX_NOTIFIER_H |
| #include <linux/errno.h> |
| |
| struct notifier_block |
| { |
| int (*notifier_call)(struct notifier_block *self, unsigned long, void *); |
| struct notifier_block *next; |
| int priority; |
| }; |
| |
| |
| #ifdef __KERNEL__ |
| |
| 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 */ |
| /* |
| * Clean way to return from the notifier and stop further calls. |
| */ |
| #define NOTIFY_STOP (NOTIFY_OK|NOTIFY_STOP_MASK) |
| |
| /* |
| * Declared notifiers so far. I can imagine quite a few more chains |
| * over time (eg laptop power reset chains, reboot chain (to clean |
| * device units up), device [un]mount chain, module load/unload chain, |
| * low memory chain, screenblank chain (for plug in modular screenblankers) |
| * VC switch chains (for loadable kernel svgalib VC switch helpers) etc... |
| */ |
| |
| /* netdevice notifier chain */ |
| #define NETDEV_UP 0x0001 /* For now you can't veto a device up/down */ |
| #define NETDEV_DOWN 0x0002 |
| #define NETDEV_REBOOT 0x0003 /* Tell a protocol stack a network interface |
| detected a hardware crash and restarted |
| - we can use this eg to kick tcp sessions |
| once done */ |
| #define NETDEV_CHANGE 0x0004 /* Notify device state change */ |
| #define NETDEV_REGISTER 0x0005 |
| #define NETDEV_UNREGISTER 0x0006 |
| #define NETDEV_CHANGEMTU 0x0007 |
| #define NETDEV_CHANGEADDR 0x0008 |
| #define NETDEV_GOING_DOWN 0x0009 |
| #define NETDEV_CHANGENAME 0x000A |
| #define NETDEV_FEAT_CHANGE 0x000B |
| |
| #define SYS_DOWN 0x0001 /* Notify of system down */ |
| #define SYS_RESTART SYS_DOWN |
| #define SYS_HALT 0x0002 /* Notify of system halt */ |
| #define SYS_POWER_OFF 0x0003 /* Notify of system power off */ |
| |
| #define NETLINK_URELEASE 0x0001 /* Unicast netlink socket released */ |
| |
| #define CPU_ONLINE 0x0002 /* CPU (unsigned)v is up */ |
| #define CPU_UP_PREPARE 0x0003 /* CPU (unsigned)v coming up */ |
| #define CPU_UP_CANCELED 0x0004 /* CPU (unsigned)v NOT coming up */ |
| #define CPU_DOWN_PREPARE 0x0005 /* CPU (unsigned)v going down */ |
| #define CPU_DOWN_FAILED 0x0006 /* CPU (unsigned)v NOT going down */ |
| #define CPU_DEAD 0x0007 /* CPU (unsigned)v dead */ |
| |
| #endif /* __KERNEL__ */ |
| #endif /* _LINUX_NOTIFIER_H */ |
