#include <linux/fs.h>
#include <linux/init.h>
#include <linux/kdev_t.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/types.h>

static char devname[] = "pidevice";
static char modname[] = "pid.ko";
static dev_t mydev;
static struct task_struct *mytask;
static struct task_struct *parent;

static void show_processes(void)
{
	mytask = current;
	parent = mytask->parent;

	while (mytask->pid != parent->pid) {
		printk(KERN_ALERT "current: %s (%d) - parent: %s (%d)\n",
				mytask->comm, mytask->pid, parent->comm, parent->pid);
		mytask = mytask->parent;
		parent = mytask->parent;
	}
}

static int __init init(void)
{
	int err;

	printk(KERN_ALERT "%s loaded by %s (%d)\n",
			modname, mytask->comm, mytask->pid);

	if ((err = alloc_chrdev_region(&mydev, 0, 1, devname)))
		printk(KERN_ALERT "ERROR in alloc_chrdev_region: %d\n", err);

	return 0;
}

static void __exit exit(void)
{
	unregister_chrdev_region(mydev, 1);
	printk(KERN_ALERT "%s unloaded\n", modname);
}

module_init(init);
module_exit(exit);

MODULE_LICENSE("GPL");