/*
   * linux/include/kmsg_dump.h
   *
   * Copyright (C) 2009 Net Insight AB
   *
   * Author: Simon Kagstrom <simon.kagstrom@netinsight.net>
   *
   * This file is subject to the terms and conditions of the GNU General Public
   * License.  See the file COPYING in the main directory of this archive
   * for more details.
   */
  #ifndef _LINUX_KMSG_DUMP_H
  #define _LINUX_KMSG_DUMP_H

  #include <linux/errno.h>

  #include <linux/list.h>
  
  enum kmsg_dump_reason {
  	KMSG_DUMP_OOPS,
  	KMSG_DUMP_PANIC,

  	KMSG_DUMP_RESTART,
  	KMSG_DUMP_HALT,
  	KMSG_DUMP_POWEROFF,
  	KMSG_DUMP_EMERG,

  };
  
  /**
   * struct kmsg_dumper - kernel crash message dumper structure
   * @dump:	The callback which gets called on crashes. The buffer is passed
   * 		as two sections, where s1 (length l1) contains the older
   * 		messages and s2 (length l2) contains the newer.
   * @list:	Entry in the dumper list (private)
   * @registered:	Flag that specifies if this is already registered
   */
  struct kmsg_dumper {
  	void (*dump)(struct kmsg_dumper *dumper, enum kmsg_dump_reason reason,
  			const char *s1, unsigned long l1,
  			const char *s2, unsigned long l2);
  	struct list_head list;
  	int registered;
  };

  #ifdef CONFIG_PRINTK

  void kmsg_dump(enum kmsg_dump_reason reason);
  
  int kmsg_dump_register(struct kmsg_dumper *dumper);
  
  int kmsg_dump_unregister(struct kmsg_dumper *dumper);

  #else
  static inline void kmsg_dump(enum kmsg_dump_reason reason)
  {
  }
  
  static inline int kmsg_dump_register(struct kmsg_dumper *dumper)
  {
  	return -EINVAL;
  }
  
  static inline int kmsg_dump_unregister(struct kmsg_dumper *dumper)
  {
  	return -EINVAL;
  }
  #endif

  
  #endif /* _LINUX_KMSG_DUMP_H */