Before I send you on your way to go out into the world and write kernel
modules, there are a few things I need to warn you about. If I fail to
warn you and something bad happen, please report the problem to me for a
full refund of the amount I got paid for your copy of the book.
Using standard libraries You can't do that. In a kernel
module you can only use kernel functions, which are the functions
you can see in /proc/ksyms.
Disabling interrupts You might need to do this for a short
time and that is OK, but if you don't enable them afterwards, your
system will be stuck and you'll have to power it off.
Sticking your head inside a large carnivore I probably don't have
to warn you about this, but I figured I will anyway, just in case.