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Socket Programming in C (UNIX & Windows)

This repository contains C code implementations for UNIX Socket Programming and Windows Socket Programming (Winsock). It also includes markdown files and PDF documentation that explain the flow, working, and functions used in the programs.

Table of Contents

• Overview
• Directory Structure
• UNIX Socket Programming
• Windows Socket Programming (Winsock)
• How to Run
• Documentation
• License

Overview

This repository aims to demonstrate the principles of socket programming in C. It covers both UNIX-based systems (using standard POSIX sockets) and Windows-based systems (using the Winsock API).

The project is divided into two sections:

• UNIX Socket Programming: Contains C code and documentation explaining socket communication using the standard Unix/Linux sockets interface.
• Windows Socket Programming (Winsock): Contains C code for socket programming in Windows using the Winsock library, along with corresponding explanations.

Both implementations follow a client-server model and include socket creation, binding, connecting, reading/writing data, and handling errors.

Directory Structure

/socket-programming-c
│
├── /unix-socket-programming
│   ├── client.c          # UNIX client code
│   ├── server.c          # UNIX server code
│   ├── README.md         # Markdown documentation for UNIX
│   └── unix-flow.pdf     # PDF document describing the UNIX flow and functions
│
├── /winsock-programming
│   ├── client.c          # Windows client code
│   ├── server.c          # Windows server code
│   ├── README.md         # Markdown documentation for Winsock
│   └── winsock-flow.pdf  # PDF document describing the Winsock flow and functions
│
├── README.md             # This file (overview of the project)
└── LICENSE               # License file

UNIX Socket Programming

This section contains C programs that demonstrate socket programming in UNIX-based systems. The code is designed to be compiled and run on Linux/Unix systems using the POSIX socket API.

Files:

• client.c: Implements a TCP client for UNIX socket communication.
• server.c: Implements a TCP server for UNIX socket communication.
• README.md: A markdown file explaining the flow, functions, and logic behind the UNIX socket programming.
• unix-flow.pdf: A PDF file describing the program flow and functions used for UNIX socket programming.

Features:

• TCP/IP Client-Server communication using sockets.
• Functions like socket(), bind(), listen(), accept(), read(), write(), and close() are demonstrated.
• Basic error handling and connection management.

You can view the markdown file (README.md) for detailed explanations about the code and the flow.

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Windows Socket Programming (Winsock)

This section contains C programs demonstrating socket programming on Windows systems using the Winsock API. The code is designed to be compiled and run on Windows.

Files:

• client.c: Implements a TCP client using Winsock for Windows socket communication.
• server.c: Implements a TCP server using Winsock for Windows socket communication.
• README.md: A markdown file explaining the flow, functions, and logic behind the Winsock socket programming.
• winsock-flow.pdf: A PDF document describing the program flow and functions used for Winsock programming.

Features:

• TCP/IP Client-Server communication using Winsock.
• Functions like socket(), bind(), listen(), accept(), recv(), send(), and closesocket() are demonstrated.
• Includes error handling and connection management for Windows.

The markdown file (README.md) in this section contains a detailed explanation of the Winsock code and flow.

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How to Run

UNIX Socket Programming

1. Install GCC (GNU Compiler Collection) if you don't have it already.
2. Compile the code:

   gcc -o unix-server server.c
   gcc -o unix-client client.c

3. Run the server (in one terminal):

   ./unix-server

4. Run the client (in another terminal):

   ./unix-client

Windows Socket Programming (Winsock)

1. Install a C Compiler (e.g., MinGW or Microsoft Visual Studio).
2. Link against Winsock during compilation (e.g., use -lws2_32 for MinGW).
3. Compile the code:

   gcc -o winsock-server server.c -lws2_32
   gcc -o winsock-client client.c -lws2_32

4. Run the server (in one Command Prompt window):

   winsock-server.exe

5. Run the client (in another Command Prompt window):

   winsock-client.exe

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Documentation

Each section (UNIX and Windows) contains a detailed markdown file (README.md) and a PDF (unix-flow.pdf / winsock-flow.pdf). These files describe:

• The program flow (from creating sockets to sending/receiving data).
• Functions used and their purpose.
• Error handling mechanisms.
• Basic troubleshooting steps.

You can check out the markdown and PDF documentation to better understand how the programs work and how to customize them for your own needs.

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License

This project is licensed under the MIT License - see the LICENSE file for details.

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Feel free to open an issue or submit a pull request if you encounter any bugs or have suggestions for improvements!

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Notes:

1. Code Compatibility: The UNIX code uses POSIX sockets, which are typically available on Linux/Unix systems, while the Windows code uses the Winsock API. Ensure you're compiling and running the appropriate code for your platform.
2. Documentation: The provided PDFs contain a comprehensive explanation of the flow and functions used in both UNIX and Windows socket programming.

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