NGROUPS_MAX in linux 2.6.3+

[Tim Hockin]

In linux 2.6.3, the value of NGROUPS_MAX has grown from 32 to 64k.  I was
looking through glibc to make sure it is all going to work and I found two
things that concern me.

1.  Linux does not have a way to report these "constants" to libc.  It is a
constant for a given kernel, but not necessarily across kernels.  I am going
to try to find a good way to do that.  Watch for a patch, unless Linus tells
me to buzz off.

2.  libc/sunrpc/svcauth_des.c creates a local array[NGROUPS].  NGROUPS is
defined in libc/sysdeps/unix/sysv/linux/sys/param.h to be NGROUPS_MAX (64k,
now).  I know this won't blow up, but I don't think it is correct.  I'm not
sure what the correct answer is, maybe have a fully dynamic grouplist or
maybe just have a different constant there.  The kernel used a new constant
for RPC credentials.

-- 
Tim Hockin
Sun Microsystems, Linux Software Engineering
address@hidden
All opinions are my own, not Sun's