include/linux/kmsg_dump.h

   1 /*
   2  * linux/include/kmsg_dump.h
   3  *
   4  * Copyright (C) 2009 Net Insight AB
   5  *
   6  * Author: Simon Kagstrom <simon.kagstrom@netinsight.net>
   7  *
   8  * This file is subject to the terms and conditions of the GNU General Public
   9  * License.  See the file COPYING in the main directory of this archive
  10  * for more details.
  11  */
  12 #ifndef _LINUX_KMSG_DUMP_H
  13 #define _LINUX_KMSG_DUMP_H
  14
  15 #include <linux/list.h>
  16
  17 enum kmsg_dump_reason {
  18         KMSG_DUMP_OOPS,
  19         KMSG_DUMP_PANIC,
  20         KMSG_DUMP_KEXEC,
  21 };
  22
  23 /**
  24  * struct kmsg_dumper - kernel crash message dumper structure
  25  * @dump:       The callback which gets called on crashes. The buffer is passed
  26  *              as two sections, where s1 (length l1) contains the older
  27  *              messages and s2 (length l2) contains the newer.
  28  * @list:       Entry in the dumper list (private)
  29  * @registered: Flag that specifies if this is already registered
  30  */
  31 struct kmsg_dumper {
  32         void (*dump)(struct kmsg_dumper *dumper, enum kmsg_dump_reason reason,
  33                         const char *s1, unsigned long l1,
  34                         const char *s2, unsigned long l2);
  35         struct list_head list;
  36         int registered;
  37 };
  38
  39 #ifdef CONFIG_PRINTK
  40 void kmsg_dump(enum kmsg_dump_reason reason);
  41
  42 int kmsg_dump_register(struct kmsg_dumper *dumper);
  43
  44 int kmsg_dump_unregister(struct kmsg_dumper *dumper);
  45 #else
  46 static inline void kmsg_dump(enum kmsg_dump_reason reason)
  47 {
  48 }
  49
  50 static inline int kmsg_dump_register(struct kmsg_dumper *dumper)
  51 {
  52         return -EINVAL;
  53 }
  54
  55 static inline int kmsg_dump_unregister(struct kmsg_dumper *dumper)
  56 {
  57         return -EINVAL;
  58 }
  59 #endif
  60
  61 #endif /* _LINUX_KMSG_DUMP_H */