[PATCH] select/poll: distinguish input buffers and screen buffers (was Re: [PATCH] select/poll Wine bug workaround)

[Paolo Bonzini]

Here is the patch.  The point is to distinguish whether console handles 
are opened for input ("input buffers") or output ("screen buffers"), and 
avoid waiting on the latter.  The reason is that the screen buffers can 
be waited on---and the effect is the same as waiting on the 
corresponding input buffer!

It seems to work (tests and GNU Smalltalk) but I'll wait for a short 
while before committing it, in case someone wants to review it.

Paolo