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> In-Reply-To: <20000425123021.F9754@fw.wintelcom.net>; from bright@wintelcom.net on Tue, Apr 25, 2000 at 12:30:21PM -0700 References: <00b901bfaee7$55da1fe0$0e00a8c0@neland.dk> <20000425123021.F9754@fw.wintelcom.net>
next in thread | previous in thread | raw e-mail | index | archive | help
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
>
>
> To Unsubscribe: send mail to majordomo@FreeBSD.org
> with "unsubscribe freebsd-hackers" in the body of the message
--
Charles Anderson caa@columbus.rr.com
No quote, no nothin'
To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-hackers" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20000425162101.D51324>