I have a homework they want me to design small code part in keyboard.c and when updating kernel and press F4 it listing process list in console please help me thanks from now

The best way to learn how to program the Kernel is to read the source code. Most of the code is very well commented. Also, look into taking a good book on the Linux kernel out from your local library, as there are books that go over how the kernel is built, and what data structures it uses.

The file you most likely want to edit is in drivers/char/keyboard.c

You will need the full kernel sources to do this, and you will also need to be able to compile your own kernel, but with an assignment like that, I assume you are already fairly good at compiling your own kernel.

Ah yes, and welcome to LinuxQuestions.org!

Just one question.. why don't you know the answer to your question already? Is it one of those stupid homeworks which demand you know stuff which was not presented to you during class/courses?

you are right but it is not my fault they gave us this homework but before this they weren't teach any thing about this homework this is the system but bad system....