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Userspace initially didn't have any sort of mechanism to handle device hotplug (either removing or inserting a device). This meant that after a short term of scanning all known devices, by fetching device events (DeviceEvent packets) from /dev/devctl, we basically never try to read it again after SystemServer initialization code. To accommodate hotplug needs, we change SystemServer by ensuring it will generate a known set of device nodes at their location during the its main initialization code. This includes devices like /dev/mem, /dev/zero and /dev/full, etc. The actual responsible userspace program to handle hotplug events is a new userspace program called DeviceMapper, with following key points: - Its current task is to to constantly read the /dev/devctl device node. Because we already created generic devices, we only handle devices that are dynamically-generated in nature, like storage devices, audio channels, etc. - Since dynamically-generated device nodes could have an infinite minor numbers, but major numbers are decoded to a device type, we create an internal registry based on two structures - DeviceNodeFamily, and RegisteredDeviceNode. DeviceNodeFamily objects are attached in the main logic code, when handling a DeviceEvent device insertion packet. A DeviceNodeFamily object has an internal HashTable to hold objects of RegisteredDeviceNode class. - Because some device nodes could still share the same major number (TTY and serial TTY devices), we have two modes of allocation - limited allocation (so a range is defined for a major number), or infinite range. Therefore, two (or more) separate DeviceNodeFamily objects can can exist albeit sharing the same major number, but they are required to allocate from a different minor numbers' range to ensure there are no collisions. - As for KCOV, we handle this device differently. In case the user compiled the kernel with such support - this happens to be a singular device node that we usually don't need, so it's dynamically-generated too, and because it has only one instance, we don't register it in our internal registry to not make it complicated needlessly. The Kernel code is modified to allow proper blocking in case of no events in the DeviceControlDevice class, because otherwise we will need to poll periodically the device to check if a new event is available, which would waste CPU time for no good reason.
SerenityOS
Graphical Unix-like operating system for x86-64 computers.
FAQ | Documentation | Build Instructions
About
SerenityOS is a love letter to '90s user interfaces with a custom Unix-like core. It flatters with sincerity by stealing beautiful ideas from various other systems.
Roughly speaking, the goal is a marriage between the aesthetic of late-1990s productivity software and the power-user accessibility of late-2000s *nix. This is a system by us, for us, based on the things we like.
You can watch videos of the system being developed on YouTube:
Screenshot
Features
- Modern x86 64-bit kernel with pre-emptive multi-threading
- Browser with JavaScript, WebAssembly, and more (check the spec compliance for JS, CSS, and Wasm)
- Security features (hardware protections, limited userland capabilities, W^X memory,
pledge&unveil, (K)ASLR, OOM-resistance, web-content isolation, state-of-the-art TLS algorithms, ...) - System services (WindowServer, LoginServer, AudioServer, WebServer, RequestServer, CrashServer, ...) and modern IPC
- Good POSIX compatibility (LibC, Shell, syscalls, signals, pseudoterminals, filesystem notifications, standard Unix utilities, ...)
- POSIX-like virtual file systems (/proc, /dev, /sys, /tmp, ...) and ext2 file system
- Network stack and applications with support for IPv4, TCP, UDP; DNS, HTTP, Gemini, IMAP, NTP
- Profiling, debugging and other development tools (Kernel-supported profiling, detailed program analysis with software emulation in UserspaceEmulator, CrashReporter, interactive GUI playground, HexEditor, HackStudio IDE for C++ and more)
- Libraries for everything from cryptography to OpenGL, audio, JavaScript, GUI, playing chess, ...
- Support for many common and uncommon file formats (PNG, JPEG, GIF, MP3, WAV, FLAC, ZIP, TAR, PDF, QOI, Gemini, ...)
- Unified style and design philosophy, flexible theming system, custom (bitmap and vector) fonts
- Games (Solitaire, Minesweeper, 2048, chess, Conway's Game of Life, ...) and demos (CatDog, Starfield, Eyes, mandelbrot set, WidgetGallery, ...)
- Every-day GUI programs and utilities (Spreadsheet with JavaScript, TextEditor, Terminal, PixelPaint, various multimedia viewers and players, Mail, Assistant, Calculator, ...)
... and all of the above are right in this repository, no extra dependencies, built from-scratch by us :^)
Additionally, there are over two hundred ports of popular open-source software, including games, compilers, Unix tools, multimedia apps and more.
How do I read the documentation?
Man pages are available online at man.serenityos.org. These pages are generated from the Markdown source files in Base/usr/share/man and updated automatically.
When running SerenityOS you can use man for the terminal interface, or help for the GUI.
Code-related documentation can be found in the documentation folder.
How do I build and run this?
See the SerenityOS build instructions. Serenity runs on Linux, macOS (aarch64 might be a challenge), Windows (with WSL2) and many other *Nixes with hardware or software virtualization.
Get in touch and participate!
Join our Discord server: SerenityOS Discord
Before opening an issue, please see the issue policy.
A general guide for contributing can be found in CONTRIBUTING.md.
Authors
- Andreas Kling - awesomekling
- Robin Burchell - rburchell
- Conrad Pankoff - deoxxa
- Sergey Bugaev - bugaevc
- Liav A - supercomputer7
- Linus Groh - linusg
- Ali Mohammad Pur - alimpfard
- Shannon Booth - shannonbooth
- Hüseyin ASLITÜRK - asliturk
- Matthew Olsson - mattco98
- Nico Weber - nico
- Brian Gianforcaro - bgianfo
- Ben Wiederhake - BenWiederhake
- Tom - tomuta
- Paul Scharnofske - asynts
- Itamar Shenhar - itamar8910
- Luke Wilde - Lubrsi
- Brendan Coles - bcoles
- Andrew Kaster - ADKaster
- thankyouverycool - thankyouverycool
- Idan Horowitz - IdanHo
- Gunnar Beutner - gunnarbeutner
- Tim Flynn - trflynn89
- Jean-Baptiste Boric - boricj
- Stephan Unverwerth - sunverwerth
- Max Wipfli - MaxWipfli
- Daniel Bertalan - BertalanD
- Jelle Raaijmakers - GMTA
- Sam Atkins - AtkinsSJ
- Tobias Christiansen - TobyAsE
- Lenny Maiorani - ldm5180
- sin-ack - sin-ack
- Jesse Buhagiar - Quaker762
- Peter Elliott - Petelliott
- Karol Kosek - krkk
- Mustafa Quraish - mustafaquraish
- David Tuin - davidot
- Leon Albrecht - Hendiadyoin1
- Tim Schumacher - timschumi
- Marcus Nilsson - metmo
- Gegga Thor - Xexxa
- kleines Filmröllchen - kleinesfilmroellchen
- Kenneth Myhra - kennethmyhra
- Maciej - sppmacd
- Sahan Fernando - ccapitalK
- Benjamin Maxwell - MacDue
- Dennis Esternon - djwisdom
- frhun - frhun
- networkException - networkException
- Brandon Jordan - electrikmilk
- Lucas Chollet - LucasChollet
- Timon Kruiper - FireFox317
- Martin Falisse - martinfalisse
- Gregory Bertilson - Zaggy1024
- Erik Wouters - EWouters
- Rodrigo Tobar - rtobar
- Alexander Kalenik - kalenikaliaksandr
- Tim Ledbetter - tcl3
- Steffen T. Larssen - stelar7
- Andi Gallo - axgallo
And many more! See here for a full contributor list. The people listed above have landed more than 100 commits in the project. :^)
License
SerenityOS is licensed under a 2-clause BSD license.