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kmsg_dump.h
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1 /*
2  * linux/include/kmsg_dump.h
3  *
4  * Copyright (C) 2009 Net Insight AB
5  *
6  * Author: Simon Kagstrom <[email protected]>
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 /*
19  * Keep this list arranged in rough order of priority. Anything listed after
20  * KMSG_DUMP_OOPS will not be logged by default unless printk.always_kmsg_dump
21  * is passed to the kernel.
22  */
31 };
32 
41 struct kmsg_dumper {
42  struct list_head list;
43  void (*dump)(struct kmsg_dumper *dumper, enum kmsg_dump_reason reason);
45  bool active;
46  bool registered;
47 
48  /* private state of the kmsg iterator */
53 };
54 
55 #ifdef CONFIG_PRINTK
56 void kmsg_dump(enum kmsg_dump_reason reason);
57 
58 bool kmsg_dump_get_line_nolock(struct kmsg_dumper *dumper, bool syslog,
59  char *line, size_t size, size_t *len);
60 
61 bool kmsg_dump_get_line(struct kmsg_dumper *dumper, bool syslog,
62  char *line, size_t size, size_t *len);
63 
64 bool kmsg_dump_get_buffer(struct kmsg_dumper *dumper, bool syslog,
65  char *buf, size_t size, size_t *len);
66 
67 void kmsg_dump_rewind_nolock(struct kmsg_dumper *dumper);
68 
69 void kmsg_dump_rewind(struct kmsg_dumper *dumper);
70 
71 int kmsg_dump_register(struct kmsg_dumper *dumper);
72 
73 int kmsg_dump_unregister(struct kmsg_dumper *dumper);
74 #else
75 static inline void kmsg_dump(enum kmsg_dump_reason reason)
76 {
77 }
78 
79 static inline bool kmsg_dump_get_line_nolock(struct kmsg_dumper *dumper,
80  bool syslog, const char *line,
81  size_t size, size_t *len)
82 {
83  return false;
84 }
85 
86 static inline bool kmsg_dump_get_line(struct kmsg_dumper *dumper, bool syslog,
87  const char *line, size_t size, size_t *len)
88 {
89  return false;
90 }
91 
92 static inline bool kmsg_dump_get_buffer(struct kmsg_dumper *dumper, bool syslog,
93  char *buf, size_t size, size_t *len)
94 {
95  return false;
96 }
97 
98 static inline void kmsg_dump_rewind_nolock(struct kmsg_dumper *dumper)
99 {
100 }
101 
102 static inline void kmsg_dump_rewind(struct kmsg_dumper *dumper)
103 {
104 }
105 
106 static inline int kmsg_dump_register(struct kmsg_dumper *dumper)
107 {
108  return -EINVAL;
109 }
110 
111 static inline int kmsg_dump_unregister(struct kmsg_dumper *dumper)
112 {
113  return -EINVAL;
114 }
115 #endif
116 
117 #endif /* _LINUX_KMSG_DUMP_H */