SystemsGuide
Node Addons in Rust With Napi rs for JavaScript Speed
napi-rs generates a Node-API addon from annotated Rust. Functions become JavaScript functions, async work runs on a thread pool, and TypeScript types come for free.
19 min read
Topic
Systems
Close to the metal: memory layout, no_std, unsafe, FFI and the microcontroller on your desk.
SystemsGuide
Python Extensions in Rust With PyO3 and Maturin Step by Step
PyO3 turns Rust functions and structs into Python modules, and Maturin builds and publishes them as wheels. A hot loop moves to Rust and the rest of the program stays Python.
18 min read
SystemsGuide
Safe Rust Bindings for a C Library a Worked Example
A good binding is two crates. The sys crate mirrors the C header exactly, and the safe crate hides the pointers behind types that cannot be misused.
19 min read
Systems
Ownership Across FFI in Rust Who Frees the Memory Explained
Memory must be freed by the allocator that created it. At an FFI boundary that means every allocation travels with a matching free function on the same side.
4 min read
SystemsGuide
Calling Rust From C With Cbindgen and Staticlib Step by Step
To expose Rust to C, mark functions extern "C" with a stable name, build a staticlib or cdylib and let cbindgen write the header. The rules are about layout, ownership and panics.
17 min read
SystemsGuide
Calling C From Rust With Extern and Bindgen Step by Step
Rust calls C through extern declarations that you write or generate. bindgen reads a header and produces them, leaving you to wrap the unsafe calls in a safe API.
17 min read
SystemsGuide
Writing a Safe Wrapper Around Unsafe Code in Rust Explained
The goal of unsafe code is to contain it. A safe wrapper has a small unsafe core, private fields that protect invariants and an API that cannot be misused from safe code.
15 min read
SystemsGuide
Writing a Custom Global Allocator in Rust to Track Memory
A global allocator is a type implementing GlobalAlloc, registered with one attribute. Wrapping the system allocator with atomic counters gives you live memory numbers.
19 min read
SystemsGuide
Rust Firmware Size Optimization Down to Tens of Kilobytes
Microcontrollers have kilobytes, not megabytes. Most of the savings come from five profile settings, avoiding the formatting machinery and finding the large symbols with cargo-bloat.
13 min read
SystemsGuide
Game Development in Rust With Bevy and Its ECS Model
Bevy organizes a game as data and functions. Entities are IDs, components are plain structs and systems are ordinary functions that query for the components they need.
17 min read
SystemsGuide
Writing a Linux Daemon in Rust With Systemd Notify
Under systemd a daemon does not fork or write pid files. It stays in the foreground, tells systemd when it is ready and exits cleanly on SIGTERM.
15 min read
SystemsGuide
Raw Sockets and Packet Parsing in Rust for Network Tools
Network tools read bytes off the wire and interpret headers. Rust makes the parsing safe with slices and explicit offsets, and crates handle the platform socket details.
20 min read
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