NONBLOCK to USB printer on 2.4.20

From: Hubert Tonneau (hubert.tonneau@pliant.cx)
Date: Mon Jan 13 2003 - 22:05:40 EST

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Writing with NONBOCK flag set to an USB printer device does not seem to work
on kernel 2.4.20 (probably some bytes are written before EAGAIN error is
returned to the application)
Seems to work properly for parallel port printer.
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