| isochronous endpoint I/O | |
| optional timerfd support (runtime detection) | |
| API docs | |
| notifications of hotplugged/unplugged devices | |
| thread safety | |
| signalfd emulation through pipes and sigaction() for older kernels | |
| signalfd not needed for usbfs? can we poll on the fd? | |
| use poll() rather than select()? |