I think you need to have a fd open on /dev/io to do inb/outb.
Jason Young
Access US(tm) Chief Network Engineer
> -----Original Message-----
> From: Leif Neland [mailto:[EMAIL PROTECTED]]
> Sent: Tuesday, April 25, 2000 1:51 PM
> To: [EMAIL PROTECTED]
> Subject: Turning on a relay.
>
>
> 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.
>
> What would be the simplest to interface from a shellscript,
> i.e. the spooler
> to turn on and off the printer? (The relay has a turn-off
> delay, so I don't
> have to worry about turning off the power after everything
> has been sent,
> but the printer not finished, or turning off/on between printjobs)
>
> Leif
>
>
>
>
>
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