USB Question: unable to open /dev/ugen0 more than once

From: Michael E. Mercer (mmercer_at_nc.rr.com)
Date: 11/24/03

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    To: freebsd-hackers@freebsd.org
Date: Sun, 23 Nov 2003 20:50:45 -0500

    Hello peoples,

    I posted this to questions with no reply, I was hoping
    someone here may be able to give some insight.

    Question: Should I be able to open /dev/ugen0 more than once?

    I am using FreeBSD 4.9-Stable, libusb-0.1.7.
    >From reading the libusb docs, you must open the device for each
    interface you want to acquire. However, once it is opened once, it can't
    be opened again.

    Furthermore, calls to usb_find_devices() shows that /dev/ugen0 has
    disappeared. Investigation on how they(libusb) finds devices, shows they
    are trying to open the device read only... this is where it tries to
    open it the second time. This second try fails and therefore libusb
    thinks the device was removed.

    Question: Is this the correct behavior?

    Any help/insight would be greatly appreciated.

    Michael E Mercer

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