And signals, timers and events (inc semaphores) have non-standard fd versions too, but they've been bolted on and you need all kinds of new syscalls to make the

And signals, timers and events (inc semaphores) have non-standard fd versions too, but they've been bolted on and you need all kinds of new syscalls to make them work right. Plan 9 did it right if you want to go "everything is a file"