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debugfs.c
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/
debugfs.c
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/*
Adapted from: https://github.com/chadversary/debugfs-tutorial/blob/47b3cf7ca47208c61ccb51b27aac6f9f932bfe0b/example1/debugfs_example1.c
Usage:
/debugfs.sh
Requires `CONFIG_DEBUG_FS=y`.
*/
#include <linux/debugfs.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <uapi/linux/stat.h> /* S_IRUSR */
MODULE_LICENSE("GPL");
static struct dentry *dir;
static u32 value = 42;
static int myinit(void)
{
struct dentry *file;
dir = debugfs_create_dir("lkmc_debugfs", 0);
if (!dir) {
printk(KERN_ALERT "debugfs_create_dir failed");
return -1;
}
file = debugfs_create_u32("myfile", S_IRUSR, dir, &value);
if (!file) {
printk(KERN_ALERT "debugfs_create_u32 failed");
return -1;
}
return 0;
}
static void myexit(void)
{
debugfs_remove_recursive(dir);
}
module_init(myinit)
module_exit(myexit)