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

MODULE_DESCRIPTION("Process list module");
MODULE_AUTHOR("so");
MODULE_LICENSE("GPL");

#define LOG_LEVEL KERN_WARNING

static int my_hello_init(void)
{
	struct task_struct *p;
	
	printk(KERN_ALERT "Entering process list module!\n");
	printk(KERN_ALERT "Current process: pid = %d; comm = %s\n", current->pid, current->comm);
	printk(KERN_ALERT "\nProcess list:\n\n");
	for_each_process(p) {
		printk(KERN_ALERT "pid = %d; comm = %s\n", p->pid, p->comm);
	}

	return 0;
}

static void hello_exit(void)
{
	printk(LOG_LEVEL "Exiting process list module!\n");
}

module_init(my_hello_init);
module_exit(hello_exit);