mirror of
https://github.com/cirosantilli/linux-kernel-module-cheat.git
synced 2026-01-13 20:12:26 +00:00
ca231b82f6
Rationale: we already had a non buildroot build system, maintaining both will be hard, and having short paths is more awesome.
56 lines
1.2 KiB
C
56 lines
1.2 KiB
C
/* https://github.com/cirosantilli/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 u32 i = 0;
|
|
static u32 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");
|