Polling a usbfs file descriptor.

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It seems (from inspecting libusb) that poll()ing a usbfs file descriptor for 
output can be used to determine when a urb can be reaped. A user has sent me a 
patch to our code that does this, and it actually does seem to work. So far, I 
haven't found any documentation on this.

Is it okay for us to use this capability?

Can anyone point me to documentation that formally describes how it works?

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Dave Mielke           | 2213 Fox Crescent | The Bible is the very Word of God.
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