UNIVERSITY OF WEST ATTICA
SCHOOL OF ENGINEERING
DEPARTMENT OF COMPUTER ENGINEERING AND INFORMATICS

University of West Attica · Department of Computer Engineering and Informatics

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Distributed Systems

Mathematical Equations using Remote Procedure Call (RPC)

Vasileios Evangelos Athanasiou
Student ID: 19390005

GitHub · LinkedIn

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Supervision

Supervisor: Vasileios Mamalis, Professor

UNIWA Profile

Supervisor: Grammati Pantziou, Professor

UNIWA Profile · LinkedIn

Co-supervisor: Doka Katerina, Senior Researcher

Academic Profile · LinkedIn

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Athens, May 2023

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README

Mathematical Equations using Remote Procedure Call (RPC)

This project involves creating a concurrent socket server using TCP AF_INET (Internet Domain) sockets in C. The server processes requests from clients to perform calculations based on two integer vectors and a real number. The computations are executed via Remote Procedure Calls (RPC) on a separate RPC server, which returns the results back to the client through the socket server.

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Table of Contents

Section	Folder / File	Description
1	assign/	Assignment material
1.1	assign/DS-LAB-ASK-1-2022-23.pdf	Laboratory assignment description (English)
1.2	assign/ΚΣ-ΕΡΓΑΣΤΗΡΙΟ-ΑΣΚ-1-2022-23.pdf	Περιγραφή εργαστηριακής άσκησης (Greek)
2	docs/	Theoretical documentation
2.1	docs/Remote-Procedure-Call.pdf	Remote Procedure Call (RPC) theory (English)
2.2	docs/Απομακρυσμένη-Κλήση-Διαδικασίας.pdf	Απομακρυσμένη Κλήση Διαδικασίας – RPC (Greek)
3	src/	Source code implementation
3.1	src/Makefile	Build automation file
3.2	src/rpc.x	RPC interface definition (XDR specification)
3.3	src/rpc.h	RPC shared header file
3.4	src/rpc_xdr.c	XDR data serialization/deserialization
3.5	src/rpc_server.c	RPC server implementation
3.6	src/rpc_svc.c	RPC service-side stub code
3.7	src/rpc_client.c	RPC client implementation
3.8	src/rpc_clnt.c	RPC client-side stub code
3.9	src/socket_client.c	Low-level socket client implementation
4	README.md	Project documentation
5	INSTALL.md	Usage instructions

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1. Key Features

• Concurrent Server: The server handles multiple client requests concurrently using forked child processes.
• TCP Socket Communication: The clients connect to the server using TCP sockets to send and receive data.
• ONC RPC: The server, acting as an RPC client, communicates with an external RPC server to perform the required calculations.
• Remote Procedure Calls: The server uses three distinct RPC-based functions for calculations, depending on the user's choice:
  1. Inner Product of Two Vectors (X * Y)
  2. Average Value of Each Vector (X̄, Ȳ)
  3. Product r*(X + Y)

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2. Program Workflow

1. Client Side:

   • The user selects the desired computation (inner product, average, or product).
   • The client sends the required data (n, vectors X and Y, and real number r) to the socket server.
   • The client waits for the result from the socket server, which is returned after processing.

2. Server Side:

   • The server accepts the client's connection and receives the computation request.
   • It forwards the data to the RPC server for processing.
   • The server receives the computed result from the RPC server and sends it back to the client.

3. RPC Server:

   • It performs the requested computation using the data provided by the socket server.