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by marios 3699 days ago
Not a map per se, but I find bxr.su is a great resource to browse *BSD source code. OpenBSD is quite close to its' 4.4BSD roots, so "The Design and Implementation of the 4.4 BSD Operating System" book should still be pretty accurate.

There is also a presentation on openbsd.org/papers that seems relevant "OpenBSD Kernel Internals: The Hitchhiker's Guide". Direct link to PDF : http://atmnis.com/~proger/openkyiv/openkyiv2009_proger_sys.p...