Date: Mon, 21 Jun 1999 18:50:30 +0200 From: Jean-Michel DRICOT <jdricot@ulb.ac.be> To: FreeBSD Questions <freebsd-questions@FreeBSD.ORG> Subject: Parallel Port File Descriptor problem Message-ID: <376E6D55.A97E41A8@ulb.ac.be>
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Hello,
I'm tryng to write bytes directly to my PC's Parallel port. As a first
shot i wrote:
open("/dev/io",O_RDWR);
outb(0x378, 0xFF);
That was correct but only the root user could handle it. (due to the
ioperm problem)...
I've put correct permissions (say 777) on /dev/lpt0 and tried using file
descriptor, like in my old LINUX Box :-) with "/dev/lp0" .
As non-root user this time I tried executing:
int fd=open("/dev/lpt0",O_RDWR);
write(fd,...........);
But my fd was always <0 (error with IOPerm.) even if executed the
program as root....
How can I get a valid FD to a parllel port in order to use
write(fd,.......) ?
Thanks for your help !
Jim
-------------------------------------------------------------------
Configuration:
KERNEL:
device ppc0 at isa? port? net irq 7
controller ppbus0
device nlpt0 at ppbus?
device plip0 at ppbus?
device ppi0 at ppbus?
NB: I also tried different combinations of these devices... But problem
remains the same...
________________________________________________________________________
"Unix IS user friendly. It's just selective about who it's friends are."
Dricot Jean-Michel
3rd year study in Computer & MicroElectronic Engineering
Polytechnic School
Free University of Brussels (ULB)
URL: http://student.ulb.ac.be/~jdricot
e-mail: jdricot@ulb.ac.be
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