socket ->initialise: address=file|tuple|int*,
domain=[{unix,inet}]Create a server or client socket. The address argument is either a file
object for Unix domain sockets or a port-number of inet-domain (TCP/IP)
sockets. For inet-domain server sockets the address argument is the
port-number or 0 (zero) to select an arbitrary free socket. The selected
port can be requested using
socket<-address.
Unix-domain sockets appear as an entry in the filesystem and are only
supported on Unix systems.
After a socket has been created and the appropriate attributes
(notably
stream->input_message)
have been specified the socket is activated using
socket->listen
for server sockets and socket->connect
for client sockets.
