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linux kernel development, 3rd edition
the next chapter is on linux system calls (programs requesting the kernel do things). there are about 300 calls in the linux kernel (https://filippo.io/linux-syscall-table/). syscalls have to be fast, yet secure, obviously, as they are used frequently and run in kernel space. the book discussed how to implement your own syscalls, and i tried for awhile to at least implement the write() call in c without header files. sadly the book's method is depreciated and i gave up. anyway, here's a syscall for write (happens to be numbered 1 on my system).