Linux kernel mirror (for testing)
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linux
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
13struct trace_seq {
14 unsigned char buffer[PAGE_SIZE];
15 unsigned int len;
16 unsigned int readpos;
17 int full;
18};
19
20static inline void
21trace_seq_init(struct trace_seq *s)
22{
23 s->len = 0;
24 s->readpos = 0;
25 s->full = 0;
26}
27
28/**
29 * trace_seq_buffer_ptr - return pointer to next location in buffer
30 * @s: trace sequence descriptor
31 *
32 * Returns the pointer to the buffer where the next write to
33 * the buffer will happen. This is useful to save the location
34 * that is about to be written to and then return the result
35 * of that write.
36 */
37static inline unsigned char *
38trace_seq_buffer_ptr(struct trace_seq *s)
39{
40 return s->buffer + s->len;
41}
42
43/*
44 * Currently only defined when tracing is enabled.
45 */
46#ifdef CONFIG_TRACING
47extern __printf(2, 3)
48int trace_seq_printf(struct trace_seq *s, const char *fmt, ...);
49extern __printf(2, 0)
50int trace_seq_vprintf(struct trace_seq *s, const char *fmt, va_list args);
51extern int
52trace_seq_bprintf(struct trace_seq *s, const char *fmt, const u32 *binary);
53extern int trace_print_seq(struct seq_file *m, struct trace_seq *s);
54extern int trace_seq_to_user(struct trace_seq *s, char __user *ubuf,
55 int cnt);
56extern int trace_seq_puts(struct trace_seq *s, const char *str);
57extern int trace_seq_putc(struct trace_seq *s, unsigned char c);
58extern int trace_seq_putmem(struct trace_seq *s, const void *mem, unsigned int len);
59extern int trace_seq_putmem_hex(struct trace_seq *s, const void *mem,
60 unsigned int len);
61extern int trace_seq_path(struct trace_seq *s, const struct path *path);
62
63extern int trace_seq_bitmask(struct trace_seq *s, const unsigned long *maskp,
64 int nmaskbits);
65
66#else /* CONFIG_TRACING */
67static inline int trace_seq_printf(struct trace_seq *s, const char *fmt, ...)
68{
69 return 0;
70}
71static inline int
72trace_seq_bprintf(struct trace_seq *s, const char *fmt, const u32 *binary)
73{
74 return 0;
75}
76
77static inline int
78trace_seq_bitmask(struct trace_seq *s, const unsigned long *maskp,
79 int nmaskbits)
80{
81 return 0;
82}
83
84static inline int trace_print_seq(struct seq_file *m, struct trace_seq *s)
85{
86 return 0;
87}
88static inline int trace_seq_to_user(struct trace_seq *s, char __user *ubuf,
89 int cnt)
90{
91 return 0;
92}
93static inline int trace_seq_puts(struct trace_seq *s, const char *str)
94{
95 return 0;
96}
97static inline int trace_seq_putc(struct trace_seq *s, unsigned char c)
98{
99 return 0;
100}
101static inline int
102trace_seq_putmem(struct trace_seq *s, const void *mem, unsigned int len)
103{
104 return 0;
105}
106static inline int trace_seq_putmem_hex(struct trace_seq *s, const void *mem,
107 unsigned int len)
108{
109 return 0;
110}
111static inline int trace_seq_path(struct trace_seq *s, const struct path *path)
112{
113 return 0;
114}
115#endif /* CONFIG_TRACING */
116
117#endif /* _LINUX_TRACE_SEQ_H */