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Last update: 1997-05-20
9945-2-72 _____________________________________________________________________________ Topic: renice Relevant Sections: 5.24 Defect Report: ----------------------- Date: Wed, 3 Aug 1994 18:35:48 -0700 From: Fred Zlotnick <fred@mindcraft.com> I would like to an request official, binding interpretation from the WG15 concerning the following points in ISO/IEC 9945-2:1993 (POSIX.2). POSIX.2 subclause 5.24 specifies the semantics of the "renice" utility. During the development of a conformance test for POSIX.2 questions about this utility have arisen. In subclause 5.24.2 the utility's behavior is described as follows: The renice utility shall request that the system scheduling priorities (see 2,2,2,177) of one or more running processes be changed. Further, in subclause 5.24.8 the exit status of renice is specified as 0 Successful completion >0 An error occurred Is it conforming for an implementation to return 0, meaning that the request is noted and is syntactically correct, but to ignore it or to honor it partially? That is, can a system return 0 but not change the specified process's priority? Can a system return 0 and change the process's priority, but not to the extent requested? Further, is there any guarantee that the priority schedule change, if honored, will persist for any period? For example, can a shell script rely on using a call such as ps -o nice -p <pid> to determine whether the scheduling priority of process <pid> has been changed in accordance with the request? Thank you for your attention to this matter. Interpretation Response: ------------------------ Question 1: yes Question 2: yes Question 3: yes, the standard clearly states this behaviour on page 594, lines 3796-3800. Question 4, Question 5 : The standard does not speak to this issue, and as such no conformance distinction can be made between alternative implementations based on this. This is being refered to the sponsor. Rationale: None. Forwarded to Interpretations group: 4 Aug 94 Proposed resolution sent for review: 19th Nov 94 Resolved: 10th Dec 94