Medium Blog Linux Kernel Module Programming Supporting Code

medium-linux-kernel-module-programming-hello.c

// hello.c
#include <linux/module.h>
#include <linux/kernel.h>

// license for the module. required
MODULE_LICENSE("GPL");

// executed when module is inserted
int init_module(void)
{
 printk(KERN_INFO "Hello, World!\n");
 return 0;
}

// executed when module is removed
void cleanup_module(void)
{
 printk(KERN_INFO "Bye World!\n");
}