* F_file_descriptor (with error bit) if ID is an invalid descriptor.
* F_interrupt (with error bit) if interrupt is received.
* F_network_reach_not (with error bit) if the network is unreachable.
+ * F_parameter (with error bit) if a parameter is invalid.
* F_progress (with error bit) if if a non-blocking connection cannot be completed immediately.
* F_prohibited (with error bit) if the file system does not permit this operation.
* F_protocol_not (with error bit) if the given protocol is unknown or is unsupported.