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#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");
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