76 lines
2.7 KiB
C
76 lines
2.7 KiB
C
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/*
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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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* Clean way to return from the notifier and stop further calls.
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*/
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#define NOTIFY_STOP (NOTIFY_OK|NOTIFY_STOP_MASK)
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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_DOWN_PREPARE 0x0005 /* CPU (unsigned)v going down */
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#define CPU_DOWN_FAILED 0x0006 /* CPU (unsigned)v NOT going down */
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#define CPU_DEAD 0x0007 /* CPU (unsigned)v dead */
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#endif /* __KERNEL__ */
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#endif /* _LINUX_NOTIFIER_H */
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