understanding basics in linux kernel , help

hi, i'm student for informational systems engineering , and this semester i have os course , which deals with the kernel and its processes threads ..... now my problem , is that most of the homeworks needs a lot of knowledge about the kernel which at the lectures we don't get into it too much , some of the required knowledge i need are : (by the way we work with linux 2.4.18 , we use this and not the newer one so we can examin how we can improve it ...). 1)after writing for instance .h .c , .h includes a wrapper function and .c is the system_call for that wrapper , where do i put those files and how can i change the system_call_table to include the new sys_call function . 2)how can i debug the code iv'e wrote , we use vmware to virtualize the linux . 3)in the first homework one of the functions we were assigned to write is one that gets two process pids and finds the first common ancestor process for these two . and at the end we were also told to write a test to test the correctness of the function , how can i do that (the test) . 4)any useful resources that include important functions and structs such as task_t .. thnx a lot , any help will be appreciated .

URL: