Program, Version, and Procedure Numbers

A remote procedure is uniquely identified by the triple:

(program number, version number, procedure number)

The program number identifies a group of related remote procedures, each of which has a unique procedure number.

A program may consist of one or more versions. Each version consists of a collection of procedures which are available to be called remotely. Version numbers enable multiple versions of an RPC protocol to be available simultaneously.

Each version contains a a number of procedures that can be called remotely. Each procedure has a procedure number.

"Program and Procedure Numbers", lists the range of values and their significance and tells you how to have a program number assigned to your RPC program. A list of mappings of RPC service name to program number is available in the rpc network database, /etc/rpc.