mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-10-30 16:07:39 +00:00
76 lines
2.7 KiB
C
76 lines
2.7 KiB
C
|
/*
|
||
|
|
* 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 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 */
|