[quoted lines by Alan Stern on 2015/02/11 at 14:45 -0500]

>Does the poll return immediately after the URB is submitted, or is
>there a delay?  What if you try calling poll _before_ the URB is
>submitted?

poll() is used for the underlying event mechanism, so it's always being caled. 
The entire application (brltty, if you're curious) is a set of event handlers 
that come and go as needed. The signalfd notification is appearing on the very 
first call to poll() after the urb is submitted.

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