for 1.0
=======
fixme review
review functionality missing over 0.1
endianness of control setup, issues when resubmitting transfers
doxygen warnings
serialization of handle_events

1.0 API style/naming points to reconsider
=========================================
typedef _cb or _cb_fn or _cb_t?

for 1.1 or future
==================
optional timerfd support (runtime detection)
notifications of hotplugged/unplugged devices
use poll() rather than select()?
offer API to create/destroy handle_events thread
isochronous sync I/O?