I have a beginner's question on the file system implementation on NetBSD.
I am trying to trace down what happens, which code is executed, from
the moment a user program issues a fopen() call until the function returns.
I mean what parts of the Kernel get executed? How are they invoked?
More importantly, what are the source files that are envolved, just
in case I want to modify some of them.

I wish there is any document describing the internal coding of
NetBSD or FreeBSD for people who want to enter the world of kernel
development.

Thanks.

Mohamed Aboutabl.