Issue 0017.28: Does errno get stored before library functions return?

This issue has been automatically converted from the original issue lists and some formatting may not have been preserved.

Authors: Derek M. Jones, WG14
Date: 1992-12-10
Reference document: X3J11/90-056
Submitted against: C90
Status: Closed
Converted from: dr.htm, dr_017.html

Ordering of conditions on return

In subclause 7.9.9.1, subclause 7.9.9.3, and subclause 7.9.9.4, the words are “returns ... and stores an implementation-defined positive value in errno.” This is a strange order of operations - shouldn't the wording be reversed?

Comment from WG14 on 1997-09-23:

Response

No. In subclause 7.9.9.1, subclause 7.9.9.3, and subclause 7.9.9.4, the words “returns ... and stores an implementation-defined positive value in errno” do not imply any temporal ordering. There are implementations that may perform these operations in either order and they still meet the standard.