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
|
/*
* Ftrace trace backend
*
* Copyright (C) 2013 Hitachi, Ltd.
* Created by Eiichi Tsukata <eiichi.tsukata.xh@hitachi.com>
*
* This work is licensed under the terms of the GNU GPL, version 2. See
* the COPYING file in the top-level directory.
*
*/
#include <stdio.h>
#include <string.h>
#include <fcntl.h>
#include <limits.h>
#include "trace.h"
#include "trace/control.h"
int trace_marker_fd;
static int find_debugfs(char *debugfs)
{
char type[100];
FILE *fp;
fp = fopen("/proc/mounts", "r");
if (fp == NULL) {
return 0;
}
while (fscanf(fp, "%*s %" STR(PATH_MAX) "s %99s %*s %*d %*d\n",
debugfs, type) == 2) {
if (strcmp(type, "debugfs") == 0) {
break;
}
}
fclose(fp);
if (strcmp(type, "debugfs") != 0) {
return 0;
}
return 1;
}
bool ftrace_init(void)
{
char debugfs[PATH_MAX];
char path[PATH_MAX];
int debugfs_found;
int trace_fd = -1;
debugfs_found = find_debugfs(debugfs);
if (debugfs_found) {
snprintf(path, PATH_MAX, "%s/tracing/tracing_on", debugfs);
trace_fd = open(path, O_WRONLY);
if (trace_fd < 0) {
perror("Could not open ftrace 'tracing_on' file");
return false;
} else {
if (write(trace_fd, "1", 1) < 0) {
perror("Could not write to 'tracing_on' file");
close(trace_fd);
return false;
}
close(trace_fd);
}
snprintf(path, PATH_MAX, "%s/tracing/trace_marker", debugfs);
trace_marker_fd = open(path, O_WRONLY);
if (trace_marker_fd < 0) {
perror("Could not open ftrace 'trace_marker' file");
return false;
}
} else {
fprintf(stderr, "debugfs is not mounted\n");
return false;
}
return true;
}
|
