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Date: Sun, 11 Jun 2006 09:55:37 -0600 (MDT)
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To: szyderca@gmail.com
From: "M. Warner Losh" <imp@bsdimp.com>
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Cc: freebsd-hackers@freebsd.org
Subject: Re: proxy device
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In message: <e68e8e2e0606110055u23168273k3b120be7cb0a1eae@mail.gmail.com>
            "Marcin Cylke" <szyderca@gmail.com> writes:
: Hi
: I'd like to write a proxy device for another usb device. I'd like it to
: be able to create a device only when an usb dev is attached, then
: destroy it when detached.
: 
: What should I do? Where can I find information about this matter?

Start by looking in uhub.c.

Warner