> To understand how a computer works when it executes a program, accesses some data, writes to a disk, spawns a process and forks it, then kills the child after a certain interrupt can pretty much only be learned by learning assembly and some hardware and OS-related literature.

Well yes, but you're talking about library code there. Your code, which links in libraries, will never fully describe those libraries.

But that library code was very likely written in C...so...