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 #75
Topic: off_t error messages and 1003.1/INT #37 Relevant Sections: Classification
IEEE Std 1003.1/2003.1/Int, October 1994 edition states that EINVAL is the errno that applies when you exceed the upper limit for off_t. Is it conforming for an implementation defined error such as EOVERFLOW to be given as the errno in the case where the file is larger in size than can be represented in an off_t? In this case seeking beyond an off_t is not an invalid position in this file and thus EINVAL would not be the appropriate errno.
Yes it is conforming. Interpretation #37 does not apply EINVAL to this case. The standard clearly states that implementations may support additional errors not listed in this clause, but shall not generate a different error number from one required by this part of ISO/IEC 9945 for an error condition described in this part of ISO/IEC 9945.
Rationale for Interpretation
None. Forwarded to Interpretation group: Aug 30 1995 Finalized: Nov 21 1995