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/errno.h>
  16 #include <linux/list.h>
  17
  18 enum kmsg_dump_reason {
  19         KMSG_DUMP_OOPS,
  20         KMSG_DUMP_PANIC,
  21         KMSG_DUMP_KEXEC,
  22         KMSG_DUMP_RESTART,
  23         KMSG_DUMP_HALT,
  24         KMSG_DUMP_POWEROFF,
  25         KMSG_DUMP_EMERG,
  26 };
  27
  28 /**
  29  * struct kmsg_dumper - kernel crash message dumper structure
  30  * @dump:       The callback which gets called on crashes. The buffer is passed
  31  *              as two sections, where s1 (length l1) contains the older
  32  *              messages and s2 (length l2) contains the newer.
  33  * @list:       Entry in the dumper list (private)
  34  * @registered: Flag that specifies if this is already registered
  35  */
  36 struct kmsg_dumper {
  37         void (*dump)(struct kmsg_dumper *dumper, enum kmsg_dump_reason reason,
  38                         const char *s1, unsigned long l1,
  39                         const char *s2, unsigned long l2);
  40         struct list_head list;
  41         int registered;
  42 };
  43
  44 #ifdef CONFIG_PRINTK
  45 void kmsg_dump(enum kmsg_dump_reason reason);
  46
  47 int kmsg_dump_register(struct kmsg_dumper *dumper);
  48
  49 int kmsg_dump_unregister(struct kmsg_dumper *dumper);
  50 #else
  51 static inline void kmsg_dump(enum kmsg_dump_reason reason)
  52 {
  53 }
  54
  55 static inline int kmsg_dump_register(struct kmsg_dumper *dumper)
  56 {
  57         return -EINVAL;
  58 }
  59
  60 static inline int kmsg_dump_unregister(struct kmsg_dumper *dumper)
  61 {
  62         return -EINVAL;
  63 }
  64 #endif
  65
  66 #endif /* _LINUX_KMSG_DUMP_H */