Filter question

[Michael Goffioul]

> I had the idea to use a printer filter to upload the firmware before
> every print job. Unfortunately I don't have enough knowledge to make it
> work. The command I want to put in front of every print job is
> 
> cat firmware.bin > /dev/usb/lp0

Under CUPS, one possibility would be to replace the usb backend
program with a wrapper of your own. Say you move the original backend
(located in /usr/lib/cups/backend/usb) to usb.orig, then you can
use a script like:

#!/bin/sh
cat firmware.bin > /dev/usb/lp0
exec /usr/lib/cups/backend/usb.orig $@

Place it into /usr/lib/cups/backend/usb.

Michael.

-- 
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Michael Goffioul		IMEC-DESICS-MIRA
e-mail: goffioul at imec.be	(Mixed-Signal and RF Applications)
Tel:    +32/16/28-8510		Kapeldreef, 75
Fax:    +32/16/28-1515		3001 HEVERLEE, BELGIUM
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