SERVICES(4) — Series 300 and 800 Only

NAME

services − service name data base

DESCRIPTION

This file associates official service names and aliases with the port number and protocol the services use. For each service a single line should be present with the following information:

<official service name> <port number/protocol name>

Reserved port numbers 0 - 255 are assigned by RFC 923.

Aliases are other names under which a service is known. Libraries like getservbyname can be invoked with a service alias instead of the service official name. For example:

shell 514/tcp cmd

In this example, getservbyname can be invoked with “cmd” instead of “shell”:

sp = getservbyname("cmd", "tcp");

instead of

sp = getservbyname("shell", "tcp");

Both produce the same results.

A line cannot start with a space. Items are separated by any number of blanks and/or tab characters. The port number and protocol name are considered a single item. A ‘/’ is used to separate the port and protocol (for example, “512/tcp”). A ‘#’ indicates the beginning of a comment. Characters from the ‘#’ to the end of the line are not interpreted by routines which search the file.

Service names can contain any printable character other than a white space, newline, or comment character. Trailing blanks or tabs are allowed at the end of a line.

EXAMPLES

shell           514/tcp   cmd
telnet          23/tcp
login           513/tcp

DEPENDENCIES

Implemented on the Series 300 and 800 only.

AUTHOR

UCB (University of California at Berkeley)

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