System V Interface Definition

The System V Interface Definition (SVID)[1] is a standard that describes the AT&T UNIX System V behavior, including that of system calls, C libraries, available programs and devices. While it was not the first attempt at a standardizations document (the industry trade association /usr/group published a standard in 1984 based on System III with a few system call additions from BSD), it was an important effort of early standardization of UNIX in a period when UNIX variants were multiplying rapidly and portability was problematic at best. By 1986, AT&T required conformance with SVID issue 2 if vendors were to actually brand their products "System V R3".[2] By the 1990s, however, its importance was largely eclipsed by POSIX and the Single UNIX Specification, which were based in part upon the SVID. Part of the reason for this was undoubtedly their vendor-independent approach (see Unix wars).

Versions of SVID
  • Version 1, based on System V Release 2, published Spring, 1985[3]
  • Version 2, based on System V Release 3, published 1986 (3 volumes)[4]
  • Version 3, based on System V Release 4, published 1989
  • Version 4, updated for compliance with XPG4 and POSIX 1003.1-1990, published 1995
gollark: If your thing only works for self-selected small groups, then it's hardly a good way to organize... our whole global societies comprising 7 billion people, quite a lot of whom don't like each other.
gollark: I just don't think it would actually work at current global scales or for probably most people.
gollark: Great!
gollark: I mean, I'd happily support anarchists being allowed to test how well things work for a self-selected group on some mostly unused land.
gollark: Anyway, thing is, people are probably *not* on the whole nice and well-meaning and selfless.

See also

References
  1. https://dl.acm.org/doi/book/10.5555/574242
  2. Libes, Don; Ressler Sandy (1989). Life with UNIX. Prentice Hall. p. 73. ISBN 0-13-536657-7.
  3. Kevorkian, D.E.; et al. (1985). System V Interface Definition: Issue 1. AT&T. LOC 84-073470.
  4. System V Interface Definition: Issue 2. AT&T. 1986. ISBN 0-932764-10-X.
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