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This update adds the following: C11 Programming Language Standard FACE Technical Standard Edition 3.0 (four profiles) Software Communication Architecture Specification 2.2.2 (one profile) Software Communication Architecture Specification 4.1 (three profiles)
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.. comment SPDX-License-Identifier: CC-BY-SA-4.0
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.. COMMENT: COPYRIGHT (c) 2018.
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.. COMMENT: On-Line Applications Research Corporation (OAR).
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| **COPYRIGHT (c) 20188.**
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.. **RTEMS Foundation, The RTEMS Documentation Project**
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Standards
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=========
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This chapter describes each of the standards which RTEMS tracks
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API alignment with. As a general rules, these standards are related
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to the POSIX or C programming language standards. Many are the result
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of domain specific efforts to define subsets or profiles or the full
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POSIX standard which are suitable for a specific domain. Each
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API set is considered a "profile" against which the full capability
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set of RTEMS is evaluated.
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The RTEMS Complete Profile is the complete set of POSIX, BSD, and
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C programming language methods supported by RTEMS. This profile is
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independent of any standard and represents a union of multiple
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standards. For example, RTEMS supports BSD derived methods that
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are not in POSIX.
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The IEEE Standard 1003.1 is the POSIX standard. Specifically, IEEE
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Standard 1003.1-2008 is the 2003 edition of the POSIX standard and IEEE
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Standard 1003.1-2008 is the 2008 edition. The 2008 is is an update from
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the 2003 edition. Each edition of the POSIX standard tends to add some
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methods, deprecate some methods, and obsolete (e.g. remove) other methods.
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PSE51 through PSE54 are Open Group defined profiles of the 2003 edition
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of the POSIX standard. These profiles are:
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* Profile 54 - Multipurpose
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* 1003.1-2003 Base Multi-process, Threads and File System
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* Profile 53 - Dedicated
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* Multi-process, Threads and File System
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* Profile 52 - Controller
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* Single Process, Threads, and File System
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* Profile 51 - Minimal
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* Single Process, Threads, with No File System
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The C99 Programming Language standard defines the Standard C Library. This
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library is largely included by reference in the POSIX standard.
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The C11 Programming Language standard defines also defines an
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updated version of the Standard C Library. It deletes a few methods
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from the C99 version but adds many methods. A large portion of these
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methods are optional and not commonly implemented.
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The Open Group FACE Consortium (https://www.opengroup.org/face)
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has defined four POSIX profiles targetting the avionics application
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domain. The FACE Technical Standard has been through multiple revisions
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and the POSIX API profiles are identical in Editions 1.0, 2.0, 2.1,
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and 2.1.1. In these editions, the profiles are as follows:
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* Security - 163 APIs, single process, no FILE *
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* Safety Basic - 246 APIs, single process, some FILE *
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* Safety Extended - 335 APIs, multi-process, more FILE *
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* General Purpose - 812 APIs, multi-process, much more
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FACE Technical Standard Edition 3.0 adds the requirement for an
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operating system to support ``clock_nanosleep()`` in all profiles and
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defines one additional subcommand for the ``posix_devctl()`` methods.
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RTEMS provides all of the methods required by the FACE Safety BASE profile
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and all of the methods in the Safety Extended profile which do not require
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multiple processes. Similarly, RTEMS provides most of the methods in the
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General Purpose profile which do not require multiple processes.
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The Software Communications Architecture (SCA) specification targets the
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requirements for software-defined radios. This specification was originally
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developed in support of the Joint Tactical Radio System (JTRS) program
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in conjunction with the Object Management Group (OMG). This standard is
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now maintained by the Wireless Innovation Forum with support from the
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U.S. Navy Joint Tactical Network Center (JTNC). Some URLs of interest:
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* SCA at Wireless Innovation Forum - http://www.wirelessinnovation.org/sca-based-standards-library
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* JTRS - https://en.wikipedia.org/wiki/Joint_Tactical_Radio_System
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* JTNC - http://www.public.navy.mil/jtnc/Pages/home.aspx
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The SCA standard is hosted at the Wireless Innovation Forum with JTNC
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hosting supplemental information.
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RTEMS includes all methods required by the SCA POSIX profiles.
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