FilesExpand file tree

 master

/

params.c

Copy path

Blame

More file actions

Blame

More file actions

Latest commit

 

History

History

History

55 lines (45 loc) · 1.21 KB

 master

/

params.c

Copy path

Top

File metadata and controls

• Code
• Blame

55 lines (45 loc) · 1.21 KB

Raw

Copy raw file

Download raw file

Open symbols panel

Edit and raw actions

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

/* https://cirosantilli.com/linux-kernel-module-cheat#kernel-module-parameters */

#include <linux/debugfs.h>

#include <linux/delay.h> /* usleep_range */

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/seq_file.h> /* seq_read, seq_lseek, single_release */

#include <uapi/linux/stat.h> /* S_IRUSR | S_IWUSR */

static int i = 0;

static int j = 0;

module_param(i, int, S_IRUSR | S_IWUSR);

module_param(j, int, S_IRUSR | S_IWUSR);

MODULE_PARM_DESC(i, "my favorite int");

MODULE_PARM_DESC(j, "my second favorite int");

static struct dentry *debugfs_file;

static int show(struct seq_file *m, void *v)

{

char kbuf[18];

int ret;

ret = snprintf(kbuf, sizeof(kbuf), "%d %d", i, j);

seq_printf(m, kbuf);

return 0;

}

static int open(struct inode *inode, struct file *file)

{

return single_open(file, show, NULL);

}

static const struct file_operations fops = {

.llseek = seq_lseek,

.open = open,

.owner = THIS_MODULE,

.read = seq_read,

.release = single_release,

};

static int myinit(void)

{

debugfs_file = debugfs_create_file("lkmc_params", S_IRUSR, NULL, NULL, &fops);

return 0;

}

static void myexit(void)

{

debugfs_remove(debugfs_file);

}

module_init(myinit)

module_exit(myexit)

MODULE_LICENSE("GPL");