lookup-port

$Revision: 5.0.2.2 $

Function

Package: ACL-SOCKET

Arguments: (port protocol)

A port number is a 16-bit unsigned number (except port 0 is not used). Certain commonly used ports on machines are given symbolic names. The mapping between name and port number is kept in a file in the system area of the machine (often /etc on Unix and the Windows system directory on MS Windows). Given a symbolic name as the value of port and a protocol (either "tcp" or "udp"), lookup-port returns the associated port number (or signals an error if such a port doesn't exist). The reason that the protocol type is supplied is that the port N for protocol "tcp" is distinct from port N for protocol "udp". j

See socket.htm for general information on sockets.

The general documentation description is in introduction.htm. The index in index.htm.