protocols - protocol name data base
This file associates protocol numbers with official protocol names and
aliases. This allows the user to refer to a protocol by a symbolic
name instead of a number. For each protocol a single line should be
present with the following information:
<official protocol name> <official protocol number> <aliases>
These mappings are defined in RFC 1700 Assigned Numbers.
Aliases are other names under which the protocol is also known. For
tcp 6 TCP
In this example, the library call getprotobyname() can be invoked as:
p = getprotobyname("TCP");
p = getprotobyname("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. A # character indicates the
beginning of a comment. Characters from the # to the end of the line
are not interpreted by routines which search the file.
Protocol names can contain any printable character other than a white
space, new-line, or comment character. Trailing blanks or tabs are
allowed at the end of a line.
tcp 6 TCP # transmission control protocol
udp 17 UDP # user datagram protocol
protocols was developed by the University of California, Berkeley.
Hewlett-Packard Company - 1 - HP-UX Release 11i: November 2000