IEEE Standards Interpretation for IEEE Std 1003.1™-1990 IEEE Standard for Information Technology--Portable Operating System Interfaces (POSIX®)
Copyright © 2001 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 #93
Topic: ICANON Relevant Sections: 18.104.22.168 lines 246-250 PASC
Clause 22.214.171.124 lines 246-250 conflicts with clause 126.96.36.199 lines 351-352 with respect to the relevance of ICANON to the translation of CR to NL on input. Lines 246-250 state that ICANON must be set as a necessary precondition to the translation of CR to NL on input. Lines 351-352 do not mention ICANON as a precondition for this mapping. Note that historical practice (BSD and System V) agree with 188.8.131.52 lines 351-352. Note also that the definition of ICANON (184.108.40.206 line 434 and lines 450-452) indicates ICANON is associated with erase and kill processing, character echo processing, and line assembly; not with input character mapping.
Ask the relevant committee to recognize, in a future revision of 1003.1, that the mention of ICANON in lines 246-250 is erroneous. State that the conformance of an implementation cannot be affected by its behavior with respect to ICANON having an effect on mapping of CR to NL on input, and that portable applications cannot rely on any such effect.
There is no conflict, clause 220.127.116.11 refers to ICANON and the reference is strictly redundant. Existing practise does do the translation when ICANON is turned off.
Rationale for Interpretation
None Forwarded to Interpretations group: 10 Sept 1998 Proposed Interpretation: 26 Oct 1998 Finalised Interpretation: February 17 1999