1) Posix takes the stance:
    The related function setgroups() is a privileged operation and
    therefore is not covered by this volume of IEEE Std 1003.1-2001.
   which is rather a copout and not helpful at all!

2/3/4) Posix requires the current behaviour.
   Although I agree that being able to call setgid() with any of the
   supplemantary groups could be useful - although of limited use
   given that netbsd doesn't use the actual group for very much.

Perhaps the documentation of setgroups should be changed?
Or maybe we should let a non-priveleged user re-order the list?

	David

-- 
David Laight: david@l8s.co.uk