we always will apply the final result just fine, when stuff stops changing. It's actually a nice feature and no a problem at all, that we only see the most recent state.

Sure, with the ioctl() we've seen many not interesting changes, but we often miss the single one that is important -- the last last one. The thing is that we don't need to sleep here and miss changes.

It's a straight-forward and simple text interface that does all we need to track console and vt changes.