Answering questions that may arise related to the meaning of portions of an IEEE standard concerning specific applications.

IEEE Standards Interpretation for IEEE Std 1003.1™-1990 IEEE Standard for Information Technology--Portable Operating System Interfaces (POSIX®)

Copyright © 1997 by the Institute of Electrical and Electronics Engineers, Inc. 3 Park Avenue New York, New York 10016-5997 USA All Rights Reserved.

Interpretations are issued to explain and clarify the intent of a standard and do not constitute an alteration to the original standard. In addition, interpretations are not intended to supply consulting information. Permission is hereby granted to download and print one copy of this document. Individuals seeking permission to reproduce and/or distribute this document in its entirety or portions of this document must contact the IEEE Standards Department for the appropriate license. Use of the information contained in this document is at your own risk.

IEEE Standards Department Copyrights and Permissions 445 Hoes Lane, Piscataway, New Jersey 08855-1331, USA

Interpretation Request #80
Referenced C Language functions Relevant Clauses: 8.1

Many of the ISO C standard functions (including but not limited to localeconv() and strerror()) have been omitted from the list in section 8.1. This would imply that this POSIX standard does not comprise the omitted functions, yet other parts of the standard, reference the omitted functions (e.g. Annex C and subsection 2.3.9, which references ALL functions defined by the C standard). Is this an intentional ommission in section 8.1? Suggested Correction: Add localeconv(), strerror(), and all the other ISO C library functions documented in Annex C (e.g. fgetpos()) to this list.

Interpretation Response
This omission was intentional.

Rationale for Interpretation
The functions listed in subsection 8.1 are a subset of widely available C library functions, chosen to be easily implemented on systems that pre-dated the C Standard. There is no need to mandate support for the full C Standard in IEEE Std 1003.1. Profile writers who wish to require such support should reference ISO/IEC 9989 as well as IEEE Std 1003.1-1996. Note that in Annex C the C library identifiers that are not required in all conforming implementations of IEEE Std 1003.1 are distinguished with asterisks to emphasize that they're included for informative and illustrative purposes and not to imply a requirement.