From mboxrd@z Thu Jan  1 00:00:00 1970
From: rsc@plan9.bell-labs.com
Message-Id: <200006171920.PAA24574@cse.psu.edu>
To: 9fans@cse.psu.edu
Subject: Re: [9fans] input methods, how?
Date: Sat, 17 Jun 2000 15:20:30 -0400
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  I need to eat keystrokes until I've got enough to form a character (or an
  error), then deliver the composite character to the focused application.

  Q:  Is there some way I can use namespaces or something to just filter what is
  read from /dev/console (not replace that service altogether,  hopefully).  So I
  want to stack a "stream filter" on top of /dev/console (just for reading),  I
  think.  Is there any such thing?

Sure.  If you require that rio be run on top of it,
then you can make it very simple; in particular
you wouldn't need to worry about writes to
/dev/cons or about flush messages.  Just take
characters as they come in from the real /dev/cons
repackage them, and use them to satisfy read
requests.  Two procs working side-by-side would
work quite well.  Have a look at /sys/src/cmd/authfs.c,
which is probably close to what you would need
(ignore all the weird authentication code at the top).

Russ