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trace_seq.h
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1 #ifndef _LINUX_TRACE_SEQ_H
2 #define _LINUX_TRACE_SEQ_H
3 
4 #include <linux/fs.h>
5 
6 #include <asm/page.h>
7 
8 /*
9  * Trace sequences are used to allow a function to call several other functions
10  * to create a string of data to use (up to a max of PAGE_SIZE).
11  */
12 
13 struct trace_seq {
14  unsigned char buffer[PAGE_SIZE];
15  unsigned int len;
16  unsigned int readpos;
17  int full;
18 };
19 
20 static inline void
21 trace_seq_init(struct trace_seq *s)
22 {
23  s->len = 0;
24  s->readpos = 0;
25  s->full = 0;
26 }
27 
28 /*
29  * Currently only defined when tracing is enabled.
30  */
31 #ifdef CONFIG_TRACING
32 extern __printf(2, 3)
33 int trace_seq_printf(struct trace_seq *s, const char *fmt, ...);
34 extern __printf(2, 0)
35 int trace_seq_vprintf(struct trace_seq *s, const char *fmt, va_list args);
36 extern int
37 trace_seq_bprintf(struct trace_seq *s, const char *fmt, const u32 *binary);
39 extern ssize_t trace_seq_to_user(struct trace_seq *s, char __user *ubuf,
40  size_t cnt);
41 extern int trace_seq_puts(struct trace_seq *s, const char *str);
42 extern int trace_seq_putc(struct trace_seq *s, unsigned char c);
43 extern int trace_seq_putmem(struct trace_seq *s, const void *mem, size_t len);
44 extern int trace_seq_putmem_hex(struct trace_seq *s, const void *mem,
45  size_t len);
46 extern void *trace_seq_reserve(struct trace_seq *s, size_t len);
48 
49 #else /* CONFIG_TRACING */
50 static inline int trace_seq_printf(struct trace_seq *s, const char *fmt, ...)
51 {
52  return 0;
53 }
54 static inline int
55 trace_seq_bprintf(struct trace_seq *s, const char *fmt, const u32 *binary)
56 {
57  return 0;
58 }
59 
60 static inline int trace_print_seq(struct seq_file *m, struct trace_seq *s)
61 {
62  return 0;
63 }
64 static inline ssize_t trace_seq_to_user(struct trace_seq *s, char __user *ubuf,
65  size_t cnt)
66 {
67  return 0;
68 }
69 static inline int trace_seq_puts(struct trace_seq *s, const char *str)
70 {
71  return 0;
72 }
73 static inline int trace_seq_putc(struct trace_seq *s, unsigned char c)
74 {
75  return 0;
76 }
77 static inline int
78 trace_seq_putmem(struct trace_seq *s, const void *mem, size_t len)
79 {
80  return 0;
81 }
82 static inline int trace_seq_putmem_hex(struct trace_seq *s, const void *mem,
83  size_t len)
84 {
85  return 0;
86 }
87 static inline void *trace_seq_reserve(struct trace_seq *s, size_t len)
88 {
89  return NULL;
90 }
91 static inline int trace_seq_path(struct trace_seq *s, const struct path *path)
92 {
93  return 0;
94 }
95 #endif /* CONFIG_TRACING */
96 
97 #endif /* _LINUX_TRACE_SEQ_H */