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| Allegro CL version 10.1 Unrevised from 10.0 to 10.1. 10.0 version

## lookup-port

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"`.

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.

|  | ToC | DocOverview | CGDoc | RelNotes | FAQ | Index | PermutedIndex
| Allegro CL version 10.1 Unrevised from 10.0 to 10.1. 10.0 version