Getting notified of screen size changes inside X server?

[Alan Coopersmith]

I'm working on support for a pointer-type input device which sends
absolute coordinates for its position events.   These are scaled in
the lower levels, so I need to pass down the size of the screen at
startup and whenever it changes.   The first part is easy, but I
haven't been able to find how to hook in to RandR notifications from
inside the server.   Is there some existing way to do so or do I need
to add some sort of screen configuration proc vector to call any
server-side components that need to be notified?   If so, any
suggestions on the best place to hook that in at?

-- 
	-Alan Coopersmith-           alan.coopersmith at sun.com
	 Sun Microsystems, Inc. - X Window System Engineering