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422 giacomo 1
/*
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 *      Routines to manage notifier chains for passing status changes to any
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 *      interested routines. We need this instead of hard coded call lists so
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 *      that modules can poke their nose into the innards. The network devices
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 *      needed them so here they are for the rest of you.
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 *
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 *                              Alan Cox <Alan.Cox@linux.org>
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 */
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#ifndef _LINUX_NOTIFIER_H
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#define _LINUX_NOTIFIER_H
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#include <linux/errno.h>
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struct notifier_block
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{
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        int (*notifier_call)(struct notifier_block *self, unsigned long, void *);
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        struct notifier_block *next;
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        int priority;
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};
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#ifdef __KERNEL__
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extern int notifier_chain_register(struct notifier_block **list, struct notifier_block *n);
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extern int notifier_chain_unregister(struct notifier_block **nl, struct notifier_block *n);
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extern int notifier_call_chain(struct notifier_block **n, unsigned long val, void *v);
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#define NOTIFY_DONE             0x0000          /* Don't care */
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#define NOTIFY_OK               0x0001          /* Suits me */
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#define NOTIFY_STOP_MASK        0x8000          /* Don't call further */
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#define NOTIFY_BAD              (NOTIFY_STOP_MASK|0x0002)       /* Bad/Veto action      */
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/*
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 *      Declared notifiers so far. I can imagine quite a few more chains
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 *      over time (eg laptop power reset chains, reboot chain (to clean
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 *      device units up), device [un]mount chain, module load/unload chain,
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 *      low memory chain, screenblank chain (for plug in modular screenblankers)
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 *      VC switch chains (for loadable kernel svgalib VC switch helpers) etc...
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 */
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/* netdevice notifier chain */
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#define NETDEV_UP       0x0001  /* For now you can't veto a device up/down */
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#define NETDEV_DOWN     0x0002
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#define NETDEV_REBOOT   0x0003  /* Tell a protocol stack a network interface
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                                   detected a hardware crash and restarted
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                                   - we can use this eg to kick tcp sessions
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                                   once done */
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#define NETDEV_CHANGE   0x0004  /* Notify device state change */
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#define NETDEV_REGISTER 0x0005
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#define NETDEV_UNREGISTER       0x0006
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#define NETDEV_CHANGEMTU        0x0007
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#define NETDEV_CHANGEADDR       0x0008
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#define NETDEV_GOING_DOWN       0x0009
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#define NETDEV_CHANGENAME       0x000A
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#define SYS_DOWN        0x0001  /* Notify of system down */
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#define SYS_RESTART     SYS_DOWN
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#define SYS_HALT        0x0002  /* Notify of system halt */
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#define SYS_POWER_OFF   0x0003  /* Notify of system power off */
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#define NETLINK_URELEASE        0x0001  /* Unicast netlink socket released */
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#define CPU_ONLINE      0x0002 /* CPU (unsigned)v is up */
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#define CPU_UP_PREPARE  0x0003 /* CPU (unsigned)v coming up */
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#define CPU_UP_CANCELED 0x0004 /* CPU (unsigned)v NOT coming up */
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#define CPU_OFFLINE     0x0005 /* CPU (unsigned)v offline (still scheduling) */
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#define CPU_DEAD        0x0006 /* CPU (unsigned)v dead */
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#endif /* __KERNEL__ */
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#endif /* _LINUX_NOTIFIER_H */