send-to

Arguments: sock buffer size &key remote-host remote-port ipv6 scope-id

For datagram sockets you can't do normal Lisp stream I/O. The data is written to the socket using this function.

The buffer argument can be a string or a byte vector; the size argument is the number of bytes of data to send. (The buffer argument is actually passed unmodified to a foreign function that will grab bytes from the address, so any simple 1-d Lisp array with any element size can in principle work, given the right byte count, provided sender and receiver have the same endianess.)

remote-host and remote-port describe where to send the data. If they aren't given then the values saved when the socket was created with make-socket are used.

The ipv6 and scope-id keyword arguments are part of IPv6 support. ipv6 defaults to the value of *ipv6*. This keyword argument is passed on to lookup-hostname when resolving remote-host.

scope-id specifies the interface to use when sending IPv6 traffic to remote-host. If remote-host is specified and is an ipv6-address structure, its scope-id slot will be updated to the value of the scope-id keyword argument.

Method for file-datagram-socket

Arguments: (sock file-datagram-socket) buffer size &key remote-filename

The method for file-datagram-sockets is like the method for datagram sockets described above, except it is used for sockets within the address family :file.

The method for file-datagram-socket is unaffected by the IPv6 changes. file-datagram sockets are not internet sockets so they cannot use IPv6 (or IPv4) addresses.

See socket.htm for general information on sockets in Allegro CL.

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This page was not revised from the 10.0 page.
Created 2019.8.20.