Re: lib/42587: nice() returns EACCES instead of (standard mandated) EPERM

[christos%zoulas.com@localhost (Christos Zoulas)]

On Jan 6,  3:45pm, ekamperi%gmail.com@localhost (ekamperi%gmail.com@localhost) 
wrote:
-- Subject: lib/42587: nice() returns EACCES instead of (standard mandated) E

| >Number:         42587
| >Category:       lib
| >Synopsis:       nice() returns EACCES instead of (standard mandated) EPERM
| >Confidential:   no
| >Severity:       non-critical
| >Priority:       low
| >Responsible:    lib-bug-people
| >State:          open
| >Class:          sw-bug
| >Submitter-Id:   net
| >Arrival-Date:   Wed Jan 06 15:45:00 +0000 2010
| >Originator:     Stathis Kamperis
| >Release:        5.0.1
| >Organization:
| >Environment:
| NetBSD 5.0.1 GENERIC/i386 (sorry, handwritter :-))
| >Description:
| Quoting from (same applies to Issue 7):
| http://www.opengroup.org/onlinepubs/000095399/functions/nice.html
| 
| The nice() function shall fail if:
| [EPERM]
|     The incr argument is negative and the calling process does not have
|      appropriate privileges.
| 
| Linux + OpenSolaris do it right. *BSD I tried return wrong error code.
| 
| 
| >How-To-Repeat:
| Call nice(-2) from a non-privileged program and check errno variable. It is 
EACCES, instead of EPERM.
| 
| 
| Trivial test case here may be found here:
| 
http://gitweb.dragonflybsd.org/~beket/pcca-tests.git/blob_plain/master:/unistd.h/t_nice.c
| >Fix:
| http://nxr.netbsd.org/source/xref/src/sys/kern/kern_resource.c#310

That will break setpriority(2). You need to make the change in nice(3).

christos