IO handler definition to allow defining the method to be used while performing a IO blocking wait, by default implemented by the IO "select" call.
|VortexIoWaitOnFdGroup ||The handler to set.|
|The ||maximum value for the socket descriptor being watched.|
|The ||requested operation to perform.|
- An error code according to the description found on this function: vortex_io_waiting_set_wait_on_fd_group.