Strange printing problem

[Paul Goyette <paul%whooppee.com@localhost>]

I'm having a heck of a time figuring this one out...

Here's  my /etc/printcap setting:

# HP DeskJet 6940 on network

lp:\
        :lp=9100@printer:\
        :sd=/var/spool/lpd/lp:\
        :lf=/var/spool/lpd/lp/log:\
        :if=/usr/pkg/libexec/magicfilter/DeskJet_6940-filter:\
        :sh:\
        :mx#0:

If I print a plain text file, it works fine, so I'm pretty sure that 
magicfilter is running correctly, and the printer can talk to lpd.

If I print a file from (for example) xv, instead of printing the file's 
contents I get a single line that says

        **** Unable to open the initial device, quitting.

That error message doesn't seem to appear anywhere in magicfilter or 
lpd.

Now if I use xv to "print" that same jpeg to a file (change the printer 
command from "lpr" to "cat > file.ps") and invoke magicfilter directly, 
as in

        /usr/pkg/libexec/magicfilter/DeskJet_6940-filter < file.ps | lpr

the file prints just fine!

Does anyone have a clue where this "Unable to open" message comes from 
and how I can get rid of it?  :)



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