Am Dienstag, den 05.10.2010, 15:57 +0200 schrieb Thomas Jarosch:
> On Tuesday, 5. October 2010 15:51:33 Thomas Klose wrote:
> > Sorry, I do not understand. Does this mean, when a device is
> > successfully claimed, it always can be used by other instances?
> >
> > If this is the case, is there a possibility to signal the other instance
> > that the device is already in use, e.g. get usb_claim_interface() to
> > return -EBUSY?
>
> Sorry, I might be wrong on this one, just rechecked with the man page.
> Have you tried to trace it with a debugger what is really going on?
>
I just found a interesting thread in the libusb-devel mailing list:
http://libusb.6.n5.nabble.com/How-to-establish-EXCLUSIVE-instead-of-SHARED-access-to-usb-device-td6878.html
It may be a bug in libusb. The problem seems to be that calling
usb_detach_kernel_driver() somehow breaks the claim on a device. I think
I've seen calls to this function in libftdi.
Regards, Thomas
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