> The problem is that read operations on usb printers might just > block/hang with no data from the printer (?). ulpt doesn't have > non-blocking I/O, so I've made a patch that simply times out read > operations, and disables further reads if it detects a blocking/stall > condition. It is possible that this breaks the back-channel, as I'm > unsure if we can expect a printer to send inbound data before we > actually write anything out? > > It looks like there are similar problems with other backends? I've only > looked at the usb backend yet. > > Sorry, the attachment got cleared by mailman. http://www.radiotube.org/patch-backend_usb-unix.c
Put it into /usr/ports/print/cups-base/files if you would like to test it.
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