You can interrupt blocking IO calls using signals, so there is an alternative to using epoll/select for this. It can also be used to implement timeouts if anoth

You can interrupt blocking IO calls using signals, so there is an alternative to using epoll/select for this. It can also be used to implement timeouts if another userspace thread tracks the IO operation duration and sends a signal to the IO blocked thread if the max duration has expired. I think Java thread interruption for blocking IO might be based on signals and is not using nonblocking IO under the hood. But I would need to read JDK source again to tell for sure