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From: Malcolm Kay <malcolm.kay@internode.on.net>
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To: Bernard Dugas <bernard.dugas@is-production.com>,
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Date: Wed, 11 Jun 2003 21:23:47 +0930
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Subject: Re: how to talk to the serial and parallel ports through a C
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On Wed, 11 Jun 2003 08:15, Bernard Dugas wrote:
> Hi,
>
> I also did some programming on serial port to control pins with a c
> program under linux, but I didn't found any simple way to port it under
> freebsd. Any hint ?
>
> For instance, I need the equivalent of :
> inb(adr)
> outb(val,adr)
> iopl(n)
> ioperm(adr)
>
> from <sys/io.h> and <stdio.h> in linux.
>

The i/o space in FreeBSD is normally reserved for management=20
by the kernel. In my opinion this makes it a real hosted OS rather
than some mickey mouse thing.

However if a process run by root opens /dev/io then while it is
held open the process can make direct access to i/o ports. Nice
for experimenting with software, but for production it is better to
write a kernel module for special driver requirements.

Are you sure the standard serial driver interfaces are not suitable=20
for your needs -- they are very flexible.

Malcolm