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/*
 *      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      */

/*
 *      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 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_OFFLINE     0x0005 /* CPU (unsigned)v offline (still scheduling) */
#define CPU_DEAD        0x0006 /* CPU (unsigned)v dead */

#endif /* __KERNEL__ */
#endif /* _LINUX_NOTIFIER_H */