The design and implementation of the 4.4BSD operating system
The design and implementation of the 4.4BSD operating system
Communications of the ACM
The use of name spaces in plan 9
EW 5 Proceedings of the 5th workshop on ACM SIGOPS European workshop: Models and paradigms for distributed systems structuring
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An outstanding novelty in UNIX at its introduction was the notion of "a file is a file is a file and even a device is a file." Going from "hardware only changes when the DEC Field engineer is here" to "my toaster has USB" has put serious strain on the rather crude implementation of the "devices as files" concept, an implementation which has survived practically unchanged for 30 years in most UNIX variants. Starting from a high-level view of devices and the semantics that have grown around them over the years, this paper takes the audience on a grand tour of the redesigned FreeBSD device-I/O system, to convey an overview of how it all fits together, and to explain why things ended up as they did, how to use the new features and in particular how not to.