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I want to learn how to write codes about RPC in Linux,
I read some codes,I find I don't learn a lot of knowledge,
such as XDR,pcaket RPC etc.
Who could recommend some books?

"Code" I a massive noun.

XDR is covered by an RFC.

For the rest, there are many implementations, but I think Modula-3 Network Objects cover the very basic principles of it nicely. (EDIT: Also, it has a bibliography of what else could be read about the subject.)