On Thu, Feb 4, 2010 at 4:56 AM, John Hughes <john@calva.com> wrote:
John Hughes wrote:
> The low 9 bits are the 3 octal digits of the shm access more "rwx".
> Above that we have at least a healthy 16-9 = 11 bits available.
What lunatic wrote that?  Of course we have 16-9 = 7 bits available.

The base kernel uses 3 (eventualy 4) so there are at least 3 bits for us.

Think you are right.  Looks like the upper 3-bits are not used in the base.