From owner-freebsd-hackers  Tue Apr 25 13:21:12 2000
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Date: Tue, 25 Apr 2000 16:21:01 -0400
From: "Charles Anderson" <caa@columbus.rr.com>
To: Alfred Perlstein <bright@wintelcom.net>
Cc: Leif Neland <leif@neland.dk>, freebsd-hackers@FreeBSD.ORG
Subject: Re: Turning on a relay.
Message-ID: <20000425162101.D51324@midgard.dhs.org>
References: <00b901bfaee7$55da1fe0$0e00a8c0@neland.dk> <20000425123021.F9754@fw.wintelcom.net>
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Yet another way.

I used 
#include <sys/kbio.h>
...
io_fd = open("/dev/console", O_RDWR, 0);
ioctl(io_fd, KDENABIO, 0);
and 
ioctl(io_fd, KDDISABIO, 0);

to turn it off again.

Is there a "right" way of doing it?  Linux has a iopl call that sets the
i/o privilege level, it seems much easier and at least better documented.
(I was porting glx code, that was using iopl)

-Charlie
On Tue, Apr 25, 2000 at 12:30:21PM -0700, Alfred Perlstein wrote:
> * Leif Neland <leifn@neland.dk> [000425 12:24] wrote:
> > I'd like to turn on a relay to the power for my laserprinter 3 rooms away
> > where the server is located.
> > 
> > I have an i/o board with a 8255 24 bit i/o port.(IIRC)
> > 
> > So I wrote a simple userland program to do inb/outb, but it dumped core with
> > BUSERR, I presume because userland is not supposed to do i/o to the
> > hardware.
> > 
> > I guess I have these options:
> > A: write a driver/kernel module to access the port.
> > B: use an extra parallel port. (I use 2 at the moment)
> > C: use a serial port; I have 3-4 available.
> 
> D: open(/dev/io)
> 
> -Alfred
> 
> 
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-- 
Charles Anderson	caa@columbus.rr.com

No quote, no nothin'


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