aboutsummaryrefslogtreecommitdiffstats
path: root/include/linux/trace_seq.h
blob: c134dd1fe6b6c45970175d445836f009ea7d9608 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
#ifndef _LINUX_TRACE_SEQ_H
#define _LINUX_TRACE_SEQ_H

#include <linux/fs.h>

#include <asm/page.h>

/*
 * Trace sequences are used to allow a function to call several other functions
 * to create a string of data to use (up to a max of PAGE_SIZE.
 */

struct trace_seq {
	unsigned char		buffer[PAGE_SIZE];
	unsigned int		len;
	unsigned int		readpos;
};

static inline void
trace_seq_init(struct trace_seq *s)
{
	s->len = 0;
	s->readpos = 0;
}

/*
 * Currently only defined when tracing is enabled.
 */
#ifdef CONFIG_TRACING
extern int trace_seq_printf(struct trace_seq *s, const char *fmt, ...)
	__attribute__ ((format (printf, 2, 3)));
extern int trace_seq_vprintf(struct trace_seq *s, const char *fmt, va_list args)
	__attribute__ ((format (printf, 2, 0)));
extern int
trace_seq_bprintf(struct trace_seq *s, const char *fmt, const u32 *binary);
extern void trace_print_seq(struct seq_file *m, struct trace_seq *s);
extern ssize_t trace_seq_to_user(struct trace_seq *s, char __user *ubuf,
				 size_t cnt);
extern int trace_seq_puts(struct trace_seq *s, const char *str);
extern int trace_seq_putc(struct trace_seq *s, unsigned char c);
extern int trace_seq_putmem(struct trace_seq *s, const void *mem, size_t len);
extern int trace_seq_putmem_hex(struct trace_seq *s, const void *mem,
				size_t len);
extern void *trace_seq_reserve(struct trace_seq *s, size_t len);
extern int trace_seq_path(struct trace_seq *s, struct path *path);

#else /* CONFIG_TRACING */
static inline int trace_seq_printf(struct trace_seq *s, const char *fmt, ...)
{
	return 0;
}
static inline int
trace_seq_bprintf(struct trace_seq *s, const char *fmt, const u32 *binary)
{
	return 0;
}

static inline void trace_print_seq(struct seq_file *m, struct trace_seq *s)
{
}
static inline ssize_t trace_seq_to_user(struct trace_seq *s, char __user *ubuf,
				 size_t cnt)
{
	return 0;
}
static inline int trace_seq_puts(struct trace_seq *s, const char *str)
{
	return 0;
}
static inline int trace_seq_putc(struct trace_seq *s, unsigned char c)
{
	return 0;
}
static inline int
trace_seq_putmem(struct trace_seq *s, const void *mem, size_t len)
{
	return 0;
}
static inline int trace_seq_putmem_hex(struct trace_seq *s, const void *mem,
				       size_t len)
{
	return 0;
}
static inline void *trace_seq_reserve(struct trace_seq *s, size_t len)
{
	return NULL;
}
static inline int trace_seq_path(struct trace_seq *s, struct path *path)
{
	return 0;
}
#endif /* CONFIG_TRACING */

#endif /* _LINUX_TRACE_SEQ_H */