Hobby kernel + userspace, built mostly from scratch. Composited GUI, dynamically linked ELF binaries, networking, Python applications, and more.
Latest commit 8fbf3bd Jun 16, 2018


ToaruOS (とあるOS)

とあるOS (ToaruOS) is a hobby operating system built mostly from scratch, including both a kernel and userspace.

This repository contains the kernel, modules, and core userspace applications and libraries. Some third-party libraries and utilities are required to build a working system.

Build Instructions

If you just want to build the kernel and userspace and get a working CD image, you can use Docker:

docker pull toaruos/build-tools:test
docker run -v `pwd`:/opt/tree -w /opt/tree -t toaruos/build-tools:test util/build-travis.sh

To build a full toolchain locally, set up a supported environment and run:

make toolchain

You may be prompted to enter your password for sudo to install required packages. The toolchain build scripts will then build several dependencies for building ToaruOS such as a GCC cross compiler and a few libraries used by the userspace. This may take around thirty minutes to an hour to complete, depending on your hardware. Once it is done, verify there were no errors and then follow the instructions provided to continue with the build.

If you experience issues, please join our IRC channel for help.


ToaruOS started as a side project at the University of Illinois at Urbana-Champaign. For several months in late 2011 and early 2012, the University's SIGOps chapter managed development efforts focused on building the original compositing GUI. Since then, the project has mostly been a one-man effort with a handful of third party contributions.


The Toaru kernel provides a basic Unix-like environment. The kernel uses a hybrid modular architecture, with loadable modules providing most device driver support. The core kernel includes support for Unix pipes and TTYs, a virtual file system, multitasking, ELF binary support, and various core platform features on x86 systems.

Modules provide support for disk drives, ext2 filesystems, serial, keyboards and mice, a /proc filesystem similar to the one found in Linux, as well as an expanding collection of other device drivers.


ToaruOS's userspace is focused on a rich graphical environment, backed by an in-house compositing window manager. ToaruOS's terminal emulator supports xterm-compatible 256-color modes, as well as Konsole 24-bit color modes and anti-aliased text with basic Unicode support. Program binaries are dynamically linked. Several graphical demos are provided, alongside a number of command-line applications. A port of SDL targetting the native graphical environment is also available.

Third-Party Software

The userspace depends on a number of third-party libraries which are outside of the development scope of the project. Additionally, several third-party applications and libraries have been integrated into ToaruOS's core userspace, or otherwise ported to ToaruOS.

License for the included third-party tools and libraries can be found here.



ToaruOS is hosted across multiple social git hosting sites:


For additional screenshots, see Screenshots.

For instructions on building, see Testing and Building.


For help building the kernel and userspace, join us in #toaruos on Freenode (irc.freenode.net).