Error

        pub const Error = error{
            /// The socket type requires that message be sent atomically, and the
            /// size of the message to be sent made this impossible. The message
            /// was not transmitted, or was partially transmitted.
            MessageOversize,
            /// The output queue for a network interface was full. This generally indicates that the
            /// interface has stopped sending, but may be caused by transient congestion. (Normally,
            /// this does not occur in Linux. Packets are just silently dropped when a device queue
            /// overflows.)
            ///
            /// This is also caused when there is not enough kernel memory available.
            SystemResources,
            /// No route to network.
            NetworkUnreachable,
            /// Network reached but no route to host.
            HostUnreachable,
            /// The local network interface used to reach the destination is offline.
            NetworkDown,
            /// The destination address is not listening. Can still occur for
            /// connectionless messages.
            ConnectionRefused,
            /// Operating system or protocol does not support the address family.
            AddressFamilyUnsupported,
            /// Another TCP Fast Open is already in progress.
            FastOpenAlreadyInProgress,
            /// Network session was unexpectedly closed by recipient.
            ConnectionResetByPeer,
            /// Local end has been shut down on a connection-oriented socket, or
            /// the socket was never connected.
            SocketUnconnected,
            /// An attempt was made to send to a network/broadcast address as
            /// though it was a unicast address.
            AccessDenied,
            /// The remote peer did not respond to ongoing communication, causing the
            /// OS to abort the connection.
            ConnectionTimedOut,
        } || Io.UnexpectedError