Unable to open device file "/dev/lpt0": Permission denied
David Reedy Jr
davidrjr at comcast.net
Tue Apr 22 15:09:21 UTC 2008
On Monday 21 April 2008 2:54:16 pm Roland Smith wrote:
> On Mon, Apr 21, 2008 at 01:05:56PM -0500, David Reedy Jr wrote:
> > Small home network. Trying to get cups working on my server.
> > FreeBSD 7.0-RELEASE #4: Tue Apr 15 11:01:37 CDT 2008
> > root at omega.myhome.net:/usr/obj/usr/src/sys/OMEGA
> > ...
> > ppc0: <Parallel port> at port 0x378-0x37f irq 7 on isa0
> > ppc0: SMC-like chipset (ECP/EPP/PS2/NIBBLE) in COMPATIBLE mode
> > ppc0: FIFO with 16/16/9 bytes threshold
> > ppbus0: <Parallel port bus> on ppc0
> > ppbus0: [ITHREAD]
> > ppbus0: IEEE1284 device found /NIBBLE
> > Probing for PnP devices on ppbus0:
> > ppbus0: <Hewlett-Packard HP LaserJet 6L/0101.01> PRINTER HP
> > ENHANCED PCL5,PJL
> > StateMessage Unable to open device file "/dev/lpt0": Permission
> > denied
> > Trying to print a test page from the cups web interface on a client
> > machine, I get the error message. Doing chmod 777 /dev/lpt0 does
> > not change anything.
> > Can somebody tell me what I've done wrong or point me in the
> > direction I should be looking?
> IICR, the print device should belong to the cups group. At least,
> that's my working setup.
> I have the following in /etc/devfs.conf:
> # Give cups printer access
> own lpt0 root:cups
> perm lpt0 0660
Thanks for the info. This didn't actually fix the problem, but I know it
was needed since I read somewhere that everything that cupsd spawns
runs as cups.
What I ended up doing was resetting my cupsd.conf to default and redid
my settings. I must have had a typo in there somewhere before because
as soon as I restarted cupsd after making the changes, the parallel and
usb ports suddenly became available as devices for the printer. I had
previously selected lpd and then manually specified the uri as
The laser on the parallel port is now working fine. I also went ahead
and setup my deskjet on usb:/dev/ulpt0. Print test pages get marked as
completed but nothing actually comes out of the printer. Still trying
to figure that one out.
> If you don't want to reboot;
> # chown root:cups /dev/lpt0
> # chmod 0660 /dev/lpt0
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