recognizing a usb device

[Chuck Robey]

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Is there any way to be able to recognizing a filename that the user has given
me as a sub device?  I figure I can try a udbhid ioctl to see if it's a USB HID
device, but is there any other way to recognize a usb device?

Using an ioctl, it just sort of seems like a messy way to do it.  I was sort of
hoping that there might've been some sort of sysctl giving ghe names, but if
there is, I couldn't find it.
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