I happen to hate errno with passion, so that option is out :) Besides especially on 64 bit systems I don't think we are going to run out of negative numbers an

I happen to hate errno with passion, so that option is out :) Besides especially on 64 bit systems I don't think we are going to run out of negative numbers any time soon. Of course there are the few outliers that need the whole space (mmap), but those should be fairly rare?