Scieneer Common Lisp 1.3.9 online documentation

ext:inet-socket-send-to fd buffer size &key remote-host remote-port flags[Function]

Attempt to send size bytes from buffer to the socket described by fd. The remote-host and remote-port provide the destination and only intended to be used for datagram connections. The number of bytes written is returned, or nil and an error code if an error occured.