HP NonStop G-Series - Manual (Page 25)

formats defined by the POSIX.1 standard; the shell and utilities defined by the POSIX.2 standard;
plus additional commands, Internationalization (I18N), the ANSI C language and compiler, and
other software features. XPG4 promotes communication between different kinds of applications
and underlies the OSS and Guardian environment interoperability feature. Broader in scope than
the POSIX standards, XPG4 is prepared and maintained by the X/Open Company Limited, an
independent, worldwide open systems organization supported by most of the world’s largest
information systems suppliers, user organizations, and software companies.
POSIX.1
Information Technology—Portable Operating System Interface (POSIX)—Part 1: System Application
Program Interface (API) [C Language], also known as ISO/IEC 9945---–1:1990 and IEEE Std
1003.1-1990, is often referred to as POSIX.1. It covers system calls, the C library, and data
interchange formats—the interface between the application and the system. Applications written
to this standard can communicate with system software that also complies with this standard,
making portable applications possible.
FIPS
Portable Operating System Interface (POSIX)—System Application Program Interface (API) [C
Language], also known as FIPS PUB 151-2, is the Federal Information Processing Standards (FIPS)
publication covering the POSIX API. Published by the National Institute of Standards and Technology,
this document formalizes the adoption of the ISO/IEC 9945-1:1990 standard as a FIPS standard
and summarizes the purpose of that standard.
POSIX.2
Information Technology—Portable Operating System Interface (POSIX)—Part 2: Shell and Utilities,
also known as ISO/IEC 9945-2:1993 and IEEE Std 1003.2-1992, is often referred to as POSIX.2.
It covers the shell and utilities—the interface between the end user and the system.
For additional information on POSIX, open systems, and portable applications, refer to one of the
publications listed in this chapter as well as commercially available books on these subjects.
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