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--- publications:standards [2024/06/06 08:40] – document POSIX standard segaloco
+++ publications:standards [2025/10/25 04:50] (current) – segaloco
@@ Line 4: / Line 4: @@
 {{:publications:1984_usr_group.jpg?direct&200|1984 /usr/group Proposed Standard}}
+{{:publications:usr_group_1984_cover.jpg?200|1984 /usr/group Final Standard}}
 Prepared on January 17, 1984, the /usr/group standard is an early UNIX standard proposed by the /usr/group international network of UNIX users.  This document was published along with the "Reviewer's Guide to the PROPOSED /usr/group Standard" as compiled March 14, 1984 and prepared by David L. Buck, which contains notes on the standard as well as a few focused papers on specific features such as file locking interfaces.
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 ==== System V Interface Definition ====
+{{:publications:1985_svid_1.jpg?direct&200|1985 SVID Issue 1}}
+{{:publications:1986_svid_issue_2.png?direct&200|1986 SVID Issue 2}}{{:publications:1992_svid_issue_3.jpg?direct&200|1992 SVID Issue 3}}
+[[http://www.bitsavers.org/pdf/att/unix/SVID/|System V Interface Definition Issue 2]]
+[[https://www.sco.com/developers/devspecs/|System V Interface Definition Issue 4 (Bottom of Page)]]
+The System V Interface Definition is a series of publications describing the minimum required user and application interface expected of UNIX systems published as System V compatible.  Four known issues exist, published in 1985, 1986, 1992, and 1995, which cover System V Release 2.0, 3.0, 4.0, and 4.2 respectively.
+As the SVID was more particular to UNIX System V, it contains many components not found in the POSIX standard.
+From the introduction of the Fourth Edition:
+The System V Interface Definition (SVID) is intended for use by anyone who must understand the operating system components that are consistent across all System V environments.  As such, its primary audience is the application developer who is building C language application programs having source code that must be portable from one System V environment to another.  A system builder should also view these volumes as necessary tools for supporting a System V environment that will host such applications.
+==== X/OPEN Portability Guide ====
+{{:publications:1985_xpg1.jpg?200|1985 XPG1}}
+{{:publications:1987_xpg2.jpg?200|1986 XPG2}}
+{{:publications:1989_xpg3.jpg?200|1989 XPG3}}
+The X/Open Portability Guide was initially published in 1985 and was derived from both the /usr/group standard as well as the SVID.  A few excerpts from the Preface to the first issue:
+The X/OPEN Group, formed in late 1984, is an initiative taken by major European suppliers of computer systems...[T]he Group defines a Common Applications Environment based on the interfaces to the UNIX operating system, and covering other aspects required of a comprehensive applications interface.  The Group has based its specification on the AT&T System V Interface Definition.
+Four versions of the XPG have been issued:
+  * Issue 1 - 1985
+  * Issue 2 - 1986
+  * Issue 3 - 1989
+  * Issue 4 - 1992
+XPG4 is the last and current issue and is a major influence on the IEEE 1003.1 POSIX standard and Single UNIX Specification.
 ==== POSIX/IEEE 1003 ====
-{{:publications:1986_posix_draft.jpg?direct&200|1986 Draft POSIX Standard}}{{:publications:1988_posix.jpg?direct&200|1988 POSIX Standard}}
+{{:publications:1986_posix_draft.jpg?direct&200|1986 Draft POSIX Standard}}
+{{:publications:1988_posix.jpg?direct&200|1988 POSIX Standard}}
+{{:publications:posix.1-iso9945-1.jpg?200|1988 ISO POSIX Standard}}
+{{:publications:posix1003.2.jpg?200|1992 POSIX 1003.2 Standard }}
 IEEE 1003.1, otherwise known as the POSIX standard, is published by the IEEE and is the current basis of the Single UNIX Specification as maintained and enforced by The Open Group.  Drawing from both the /usr/group and System V Interface Definition standards, POSIX aims to be a vendor-neutral standard applicable to diverse operating systems presenting a UNIX-like application programming interface.
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 The various interface facilities described herein are based on the 1984 /usr/group Standard derived and published by the /usr/group Standards Committee, Santa Clara, California.  The 1984 /usr/group Standard and subsequent work of the 1003.1 Working Group is largely based on UNIX Seventh Edition, UNIX System III, UNIX System V, 4.2BSD, and 4.3BSD documentation, but wherever possible, compatibility with other systems derived from the UNIX operating system, or systems compatible with that system, has been maintained.
+==== Spec 1170/Single UNIX Specification ====
+{{:publications:1995_sus.jpg?direct&200|1995 Go Solo with the Single UNIX Specification}}
+[[https://pubs.opengroup.org/onlinepubs/009696899/|The Open Group Base Specifications Issue 6]]
+[[https://pubs.opengroup.org/onlinepubs/9699919799/|The Open Group Base Specifications Issue 7]]
+Spec 1170, now known as the Single UNIX Specification, is a standard maintained by The Open Group, consisting of the former X/Open and Open Software Foundation organizations.  This standard, which extends IEEE 1003/POSIX, is the primary standard administered by The Open Group today and the standard currently applied to systems wishing to utilize the UNIX trademark.
+Above is Go Solo, an informative work published by X/Open in 1995 with the initial version of the Single UNIX Specification included on a CD-ROM.  From the foreword:
+Go Solo is designed as an aid to understanding the Single UNIX Specification as well as a means of delivering 2,700 pages of X/Open Specifications in a convenient and easily accessible media, namely on CD-ROM with an SGML-based browser.