🚀 Jayshozie's Systems Programming Portfolio

This repository serves as a central collection and version control manager (using Git submodules) for my low-level systems programming curriculum.

Why submodules?

Each project (e.g., yacc) is a completely separate repository, allowing for independent versioning, branching and clear history tracking.

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🏗️ Project Containers

Icon	Module Name	Description	Key Focus
🧠	C-Systems-Fundamentals	Core C projects focusing on manual memory management, pointer arithmetic, and concurrency primitives (Mutexes, Queues).	C Mastery & Concurrency
🌐	Networking	Low-level networking projects built with POSIX sockets, demonstrating different I/O and server architectures.	I/O Multiplexing & Sockets

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💻 Projects by Container

🧠 C-Systems-Fundamentals

• yacc (Yet Another Cat Clone): A re-implementation of the GNU Coreutils utility cat to master the Standard I/O and Syscall interfaces (read/write) and I/O buffering techniques. Version v2.0 implements cat with stdio, with version v3.0 I implemented the entire project using syscalls. (Current Version: v3.0)

• jayshell: A shell interpreter written in C as a study project. It uses readline for its initial shell loop, it can do basic command parsing with strtok(), it has support for external commands using fork() and execvp(), and lastly it has 2 basic built-in commands, exit and cd (without ~ support, yet). (Current Version: v1.0)

🌐 Networking

• Iterative-Blocking-TCP-Example: A simple server/client system demonstrating the blocking I/O model—where the server processes a single client at a time. At this point the server automatically shuts down after the connected client disconnects, but the server waiting again for another connection can be easily implemented in v2.0. (Current Version: v1.0)
• IOMUX-Chat-System-in-C: A multi-client chat server using I/O Multiplexing (select / poll) to synchronously manage multiple connections within a single process. I'm still working on it, a stable version release doesn't exist yet. (Current Version: N/A)
• Socket Programming Utilities: A directory of small tests I've done with the subject. It doesn't include any necessary stuff, I just used this to understand the socket interface in C.

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📖 Curriculum and Resources

These projects are guided by the goal of kernel development and are supported by the following resources:

• System Calls: Advanced Programming in the UNIX Environment (APUE) / The Linux Programming Interface (TLPI)
• Architecture: Computer Systems: A Programmer's Perspective (CS:APP)
• Networking Theory: Computer Networking: a Top-Down Approach (K&R)

🤝 Contribution

Contributions and feedback are always welcome. Please feel free to open an Issue or PR in the respective submodule's repository.