February, 2025

Writing an OS Kernel from Scratch – Part 25: Unix Domain Sockets — The Foundation of Inter-Process Communication (IPC) “The Display Server and Client need efficient communication, but pipes are unidirectional and unstructured. Today, we implement Unix Domain Sockets (AF_UNIX), making IPC as natural as file operations!” In the previous post, we built the Display... » read more

Writing an OS Kernel from Scratch – Part 9: User Program Loading — ELF Parsing and Simple Filesystem “Your OS can fork/exec, but where do programs come from? Today, we build the first filesystem, letting the kernel load user programs from ‘disk’!” In the previous post, we implemented fork and exec, but user programs still... » read more

Writing an OS Kernel from Scratch – Part 24: Display Server and Client — Building a Shared Memory Graphics Architecture “Framebuffer lets you draw pixels, but how do multiple applications share the screen? Today, we implement a Display Server + Client architecture, achieving efficient graphics compositing via shared memory!” In the previous post, we implemented... » read more

Writing an OS Kernel from Scratch – Part 20: User Toolchain — Implementing ls, cat, mkdir and Other Basic Commands “No matter how powerful the kernel, without user tools, it’s just an island. Today, we write the first user-mode shell toolset, making your OS truly usable!” In the previous 19 posts, we built a complete... » read more

Writing an OS Kernel from Scratch – Part 32: Integrating LVGL — Text Editor with Open Source GUI Framework “Building wheels from scratch is fun, but industrial-grade GUI needs mature frameworks. Today, we port LVGL (Light and Versatile Graphics Library) to our OS, implementing a professional text editor!” In previous posts, we built from scratch:... » read more