1 files changed, 75 insertions, 0 deletions

diff --git a/include/linux/notifier.h b/include/linux/notifier.h
new file mode 100644
index 000000000000..9303a003e9ab
--- /dev/null
+++ b/include/linux/notifier.h
@@ -0,0 +1,75 @@
+/*
+ *      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 */