From mboxrd@z Thu Jan  1 00:00:00 1970
Message-ID: <57491b2937028588564c58c83826c506@felloff.net>
Date: Thu, 17 Jul 2014 20:41:06 +0200
From: cinap_lenrek@felloff.net
To: 9fans@9fans.net
In-Reply-To: <2bd8d0124ea7bda9b5ba618c07633cab@ladd.quanstro.net>
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Subject: Re: [9fans] kbdputc() in devcons.c in 9front?
Topicbox-Message-UUID: 050e85e4-ead9-11e9-9d60-3106f5b1d025

rio multiplexes /dev/kbd, so it opens it and derives the windows kbd
and cons files from it. it obviously has to read /dev/kbd to multiplex
it. now, the incompatibility is that opening /dev/kbd disables /dev/cons
input.

the reason is that /dev/cons is buffered but pressing keys on the keyboard
will result in characters being queued to /dev/cons. /dev/kbd reading programs
should *not* require a dummy reader proc to flush duplicated console input in
addition to reading /dev/kbd. you open /dev/kbd and the keyboard is yours.

it is also harder to filter or translate multiple asynchronously read
file stremas instead of just one. and filtering /dev/kbd is not much
differnet from filtering /dev/cons. in addition, you have keyboard
chords.

--
cinap