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
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
|
#include "monitor_proc.h"
#include <linux/kernel.h>
#include <linux/proc_fs.h>
#include <linux/types.h>
#include <linux/uaccess.h>
const char* proc_dir = "variable_monitor";
int def_interval_ns = DEFAULT_INTERVAL_NS;
int dump_reset_sec = DEFAULT_DUMP_RESET_SEC;
int sample_all = DEFAULT_SAMPLE_ALL;
int stack_capture_mode = STACK_CAPTURE_AGGREGATE;
static ssize_t read_proc(struct file *file, char __user *buf, size_t count,
loff_t *offset, int *var) {
char temp_buf[32];
size_t len = sprintf(temp_buf, "%d\n", *var);
return simple_read_from_buffer(buf, count, offset, temp_buf, len);
}
static ssize_t write_proc(struct file *file, const char __user *buf,
size_t count, loff_t *offset, int *var) {
char temp_buf[32];
if (count > sizeof(temp_buf) - 1)
return -EINVAL;
if (copy_from_user(temp_buf, buf, count))
return -EFAULT;
temp_buf[count] = '\0';
sscanf(temp_buf, "%d", var);
return count;
}
static ssize_t read_proc_def_interval_ns(struct file *file, char __user *buf,
size_t count, loff_t *offset) {
return read_proc(file, buf, count, offset, &def_interval_ns);
}
static ssize_t read_proc_dump_reset_sec(struct file *file, char __user *buf,
size_t count, loff_t *offset) {
return read_proc(file, buf, count, offset, &dump_reset_sec);
}
static ssize_t write_proc_def_interval_ns(struct file *file,
const char __user *buf, size_t count,
loff_t *offset) {
return write_proc(file, buf, count, offset, &def_interval_ns);
}
static ssize_t write_proc_dump_reset_sec(struct file *file,
const char __user *buf, size_t count,
loff_t *offset) {
return write_proc(file, buf, count, offset, &dump_reset_sec);
}
static ssize_t read_proc_sample_all(struct file *file, char __user *buf,
size_t count, loff_t *offset) {
return read_proc(file, buf, count, offset, &sample_all);
}
static ssize_t write_proc_sample_all(struct file *file,
const char __user *buf, size_t count,
loff_t *offset) {
return write_proc(file, buf, count, offset, &sample_all);
}
static ssize_t read_stack_capture_mode(struct file *file, char __user *buf,
size_t count, loff_t *offset) {
return read_proc(file, buf, count, offset, &stack_capture_mode);
}
static ssize_t write_stack_capture_mode(struct file *file,
const char __user *buf, size_t count,
loff_t *offset) {
return write_proc(file, buf, count, offset, &stack_capture_mode);
}
static const struct proc_ops proc_def_interval_ns_ops = {
.proc_read = read_proc_def_interval_ns,
.proc_write = write_proc_def_interval_ns,
};
static const struct proc_ops proc_dump_reset_sec_ops = {
.proc_read = read_proc_dump_reset_sec,
.proc_write = write_proc_dump_reset_sec,
};
static const struct proc_ops proc_sample_all_ops = {
.proc_read = read_proc_sample_all,
.proc_write = write_proc_sample_all,
};
static const struct proc_ops stack_capture_mode_ops = {
.proc_read = read_stack_capture_mode,
.proc_write = write_stack_capture_mode,
};
int monitor_proc_init(void) {
struct proc_dir_entry *dir;
dir = proc_mkdir(proc_dir, NULL);
if (!dir) {
pr_err("variable_monitor: failed to create /proc directory\n");
return -ENOMEM;
}
proc_create("def_interval_ns", 0666, dir, &proc_def_interval_ns_ops);
proc_create("dump_reset_sec", 0666, dir, &proc_dump_reset_sec_ops);
proc_create("sample_all", 0666, dir, &proc_sample_all_ops);
proc_create("stack_capture_mode", 0666, dir, &stack_capture_mode_ops);
return 0;
}
int monitor_proc_exit(void) {
// remove_proc_entry("def_interval_ns", NULL);
// remove_proc_entry("dump_reset_sec", NULL);
remove_proc_subtree(proc_dir, NULL);
return 0;
}
|
