/*###########################################################

# Baby's first dynamic loadable kernel module!

# As basic as it gets.

# Usage: (sudo) insmod ./babysfirst_module.ko

###########################################################*/

#include <linux/init.h>

#include <linux/module.h>

// Seems to be needed if our kernel has version suppport is enabled.

MODULE_LICENSE("Dual BSD/GPL");

// Init function (called by insmod)

static int baby_init(void)

{

// We are no longer in user space, so no glibc for us. Print message to syslog:

printk(KERN_ALERT "My first module just got loaded into kernel space. Yay!\n");

// Signal that we are correctly initialized:

return 0;

}

// Exit function (called by rmmod)

static void baby_exit(void)

{

// Again, all we do is print a syslog message.

printk(KERN_ALERT "My first module got unloaded. Doh!\n");

}

// Use kernel macros to declare init and exit functions:

module_init(baby_init);

module_exit(baby_exit);