Networks in C - From Sockets to a Multiplexed Chat Server

Learn how to create real network applications in C using sockets, buffers, TCP, and multiplexing with poll()
What you'll learn
Create a simple TCP client in C that connects to a real server
Understand how sockets, file descriptors and network I/O work in practice
Build a multi-client chat server in C using poll() for multiplexing
Handle connections, disconnections and message broadcasting efficiently
Implement a scalable server using C
Requirements
Basic to intermediate understanding of the C programming language
A computer where you can install Linux or use a Linux environment (WSL, VM, or native)
Description
Do you already know the basics of C and want to apply your knowledge in a real scenario?In this course, you will learn how real network applications work - by building one from scratch.This is a hands-on, step-by-step guide where you will create a fully functional multiplexed chat server using modern C network programming techniques. No prior networking or Linux experience is required; everything is explained clearly from the beginning.You will understand how sockets work internally, how TCP connections are created, how messages travel across the network, and how to manage multiple clients at the same time using the poll() system call.We will also cover message buffering, connection handling, disconnection detection, reading partial data, and building a safe, stable, and fully functional server.In addition, you'll gain practical experience and develop a clear perspective on real network behavior, analyzing message flow, and understanding how servers manage client state. These skills are essential for anyone advancing into professional software development.By the end of the course, you will not only know how to write network code in C - you will understand how network systems behave at a low level, giving you a strong foundation for systems programming, security, network engineering, or any performance-critical field.
Who this course is for
Students who already know basic to intermediate C and want to take the next step into real-world system programming
Developers who want to understand networks
Developers who want to build and run a real network application in C
Anyone interested in building real TCP clients and servers using C
Learners who want a clear and practical introduction to sockets, network I/O, and multiplexing (poll)
Curious programmers who want to strengthen their foundation in concepts used in performance-critical software
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