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 © 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 Number: #111
signal concepts Relevant Sections: p78 line 870, p79 line 883 PASC

At 870, there's the "with a single exception clause". At 883 in the sentence beginning with "If" would seem to disallow that exception. (That is, if a return is executed by the handler, all would seem to be required to work right, regardless of what went before.)

Replace the sentence with a pointer to the discussion of signal-safe and unsafe functions.

Interpretation Response
The standard is unclear on this issue, and no conformance distinction can be made between alternative implementations based on this. This is being referred to the sponsor.

Rationale for Interpretation

Notes to Project Editor (not part of this interpretation)
Add "except as ..." on line 870: "...except as noted for unsafe functions". Forwarded to Interpretations group: 19 June 2000 Proposed resolution: 25 July 2000 Finalized interpretation: 29 August 2000