🖥️ Mini OS Simulator (C/C++)

A command-line based Operating System Simulator built in C/C++. This project demonstrates core OS concepts like process scheduling, memory management, and file systems through an interactive shell.

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🚀 Features

🔹 Process Scheduling

• Shortest Job First (SJF)
• (Extendable to FCFS, Round Robin, Priority Scheduling)

🔹 Memory Management

• Paging simulation
• Page fault calculation
• (Extendable to LRU, FIFO, Optimal)

🔹 File System Simulation

• Create files
• Read files
• Write content
• Delete files

🔹 Custom Shell

• Interactive CLI interface

• Commands:

  • schedule → Run CPU scheduling
  • memory → Run memory simulation
  • fs → File system operations
  • exit → Quit simulator

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🧠 Concepts Covered

• CPU Scheduling Algorithms
• Memory Allocation & Paging
• File System Basics
• Command Line Interface Design

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🏗️ Project Structure

os-simulator/
│
├── main.cpp          # Shell interface
├── scheduler.cpp     # CPU scheduling logic
├── scheduler.h
├── memory.cpp        # Memory management (paging)
├── memory.h
├── filesystem.cpp    # File system simulation
├── filesystem.h
└── README.md

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⚙️ How to Run

🔧 Compile

g++ main.cpp scheduler.cpp memory.cpp filesystem.cpp -o os

▶️ Run

./os

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🖼️ Sample Usage

Mini OS Simulator Started...

OS> schedule
Enter number of processes: 3
Burst time for P1: 5
Burst time for P2: 2
Burst time for P3: 8

SJF Order:
P2 P1 P3

OS> memory
Enter number of pages: 5
Enter number of frames: 3
Enter page: 1
Enter page: 2
Enter page: 3
Enter page: 1
Enter page: 4

Page Faults: 4

OS> fs
Commands: create read write delete exit
FS> create file1
FS> write file1
Enter content: Hello World
FS> read file1
Hello World

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🔥 Future Improvements

• Round Robin Scheduling (with time quantum)
• LRU Page Replacement Algorithm
• Multi-threaded process simulation
• User authentication system
• Colored terminal UI
• Logging system

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💡 Why This Project?

This project is designed to strengthen understanding of fundamental operating system concepts while building a practical, interactive tool. It is suitable for:

• Academic learning
• Demonstrating OS knowledge in interviews
• Enhancing GitHub portfolio

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📌 Author

Atharva Sable

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⭐ Contribute

Feel free to fork this repository, improve it, and submit a pull request.

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📄 License

This project is open-source and available under the MIT License.