Path: utzoo!mnetor!uunet!husc6!ut-sally!bcm!soma!masscomp-request
From: jbuck@epimass.epi.com (Joe Buck)
Newsgroups: comp.sys.masscomp
Subject: Problem with "getgroups" system call
Message-ID: <3351@soma.bcm.tmc.edu>
Date: 15 Mar 88 06:18:25 GMT
Sender: masscomp@soma.bcm.tmc.edu
Organization: Entropic Processing, Inc., Cupertino, CA
Lines: 28
Approved: masscomp@soma.bcm.tmc.edu



I first noticed this when building "perl".

On RTU 3.1 on our 5600, the man page for "getgroups"
claims that the groups array consists of unsigned shorts.
After doing a few experiments, I find that it does not;
I only get consistent results when I pass it an array
of ints or unsigned ints.  It's easy to duplicate this;
from an account that is in more than one group, run the
program

main () {
    int gary[32];
    int i = getgroups(32,gary), j;
    for (j = 0; j < i; j++) printf ("%d ", gary[j]);
    printf ("\n");
}

The results will be correct.  Change the declaration of
gary to "unsigned short" as described in the man page
and the program no longer works.

So what gives?

-- 
- Joe Buck  {uunet,ucbvax,sun,<smart-site>}!epimass.epi.com!jbuck
	    Old Internet mailers: jbuck%epimass.epi.com@uunet.uu.net