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         KMSG_DUMP_RESTART,
  22         KMSG_DUMP_HALT,
  23         KMSG_DUMP_POWEROFF,
  24         KMSG_DUMP_EMERG,
  25 };
  26
  27 /**
  28  * struct kmsg_dumper - kernel crash message dumper structure
  29  * @dump:       The callback which gets called on crashes. The buffer is passed
  30  *              as two sections, where s1 (length l1) contains the older
  31  *              messages and s2 (length l2) contains the newer.
  32  * @list:       Entry in the dumper list (private)
  33  * @registered: Flag that specifies if this is already registered
  34  */
  35 struct kmsg_dumper {
  36         void (*dump)(struct kmsg_dumper *dumper, enum kmsg_dump_reason reason,
  37                         const char *s1, unsigned long l1,
  38                         const char *s2, unsigned long l2);
  39         struct list_head list;
  40         int registered;
  41 };
  42
  43 #ifdef CONFIG_PRINTK
  44 void kmsg_dump(enum kmsg_dump_reason reason);
  45
  46 int kmsg_dump_register(struct kmsg_dumper *dumper);
  47
  48 int kmsg_dump_unregister(struct kmsg_dumper *dumper);
  49 #else
  50 static inline void kmsg_dump(enum kmsg_dump_reason reason)
  51 {
  52 }
  53
  54 static inline int kmsg_dump_register(struct kmsg_dumper *dumper)
  55 {
  56         return -EINVAL;
  57 }
  58
  59 static inline int kmsg_dump_unregister(struct kmsg_dumper *dumper)
  60 {
  61         return -EINVAL;
  62 }
  63 #endif
  64
  65 #endif /* _LINUX_KMSG_DUMP_H */