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From: Malcolm Kay <malcolm.kay@internode.on.net>
Organization: At home
To: Mark <admin@asarian-host.net>, <freebsd-questions@freebsd.org>
Date: Sun, 27 Jul 2003 15:11:00 +0930
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Subject: Re: Unable to open /dev/io
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On Sun, 27 Jul 2003 07:19, Mark wrote:
> Earlier, I had asked a question on how to write a byte to the parallel
> port. And Daan Vreeken was kind enough to point me to a litle c-source =
that
> uses /dev/io.
>
> Unfortunately, as I just found out, when I raise kern.securelevel to 2
> (FreeBSD 4.7R), I can no longer open /dev/io for writing. :( That means=
 I
> can no longer use this method; because there is no way I will allow my
> production server to run at kern.securelevel lower than 2. Which means =
I am
> back to square one. :(
>
> Sigh. Is there then no way to write a simple 0 or 1 to the parallel por=
t,
> without compromizing the security of the server at large?
>

I also responded to your original enquiry suggesting that you might
also look at accessing the parallel port via /dev/ppi0 which can set the =
data
port using an ioctl() call -- man page ppi(4)

I believe this has less restrictions than /dev/io opening the whole devic=
e=20
port area.

This might circumvent your problem.

> Thanks,
>
> - Mark
>

Malcolm Kay