The sample RPC programs we looked at in class are here.
Each directory holds the code for a complete RPC system (server and client), check the README files for more details.

• simple: remote integer add and subtract procedures.

• ulookup: Remote username and uid lookup procedures. The server returns the username corresponding to a UID (on the server system) or the UID corresponding to a username. Among other things, this example show how to use the XDR string type.

• better_ulookup: Better remote username and uid lookup procedures. Almost the same as lookup, but now the procedures return complex types that include a status indicator (to indicate when the lookup failed).

• rpctalk: RPC based talk program. This is an example of a hand-made RPC program and includes a custom dispatcher and asynchronous remote procedures. There is a single program that acts as both client and server. This code is old, and although it compiles on BSD machine it doesn't work (primary server SEGVs as soon as a client connects).

There are also some RFCs heres:

• RFC 1831 - Remote Procedure Call Protocol Specification Version 2
• RFC 1832 - XDR: External Data Representation Standard