Date: Tue, 25 Apr 2000 13:57:48 -0500 From: Jason Young <jyoung@accessus.net> To: 'Leif Neland' <leif@neland.dk>, freebsd-hackers@FreeBSD.ORG Subject: RE: Turning on a relay. Message-ID: <ABD44D466F85D311A69900A0C900DB6B1954EE@staff.accessus.net>
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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:leifn@neland.dk] > Sent: Tuesday, April 25, 2000 1:51 PM > To: freebsd-hackers@FreeBSD.ORG > 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 > > > > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-hackers" in the body of the message > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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