1 isochronous endpoint I/O
2 optional timerfd support (runtime detection)
3 timer (call me back in 2 seconds) implementation (then remove signalfd)
5 notifications of hotplugged/unplugged devices
7 use poll() rather than select()?
8 abstraction for cross-platform-ness
10 API style/naming points to reconsider
11 =====================================
13 struct libusb_(bulk|control)_transfer or parameters?
15 urbh in general (should this be a transfer handle?)
17 config struct/function naming