libc-kotlin in Kotlin

Before working in this repo, read FFI_DESIGN.md — the authoritative design for porting the 922 stub functions to real C/C++ FFI implementations via cinterop (native) and N-API (JS/WASM).

This is a Kotlin Multiplatform line-by-line transliteration port of rust-lang/libc.

Original Project: This port is based on rust-lang/libc. All design credit and project intent belong to the upstream authors; this repository is a faithful port to Kotlin Multiplatform with no behavioural changes intended.

This is an in-progress port. The goal is feature parity with the upstream Rust crate while providing a native Kotlin Multiplatform API. Every Kotlin file carries a // port-lint: source <path> header naming its upstream Rust counterpart so the AST-distance tool can track provenance.

The text below is reproduced and lightly edited from https://github.com/rust-lang/libc. It is the upstream project's own description and remains under the upstream authors' authorship; links have been rewritten to absolute upstream URLs so they continue to resolve from this repository.

libc provides all of the definitions necessary to easily interoperate with C code (or "C-like" code) on each of the platforms that Rust supports. This includes type definitions (e.g. c_int), constants (e.g. EINVAL) as well as function headers (e.g. malloc).

This crate exports all underlying platform types, functions, and constants under the crate root, so all items are accessible as libc::foo. The types and values of all the exported APIs match the platform that libc is compiled for.

Windows API bindings are not included in this crate. If you are looking for WinAPI bindings, consider using crates like windows-sys.

More detailed information about the design of this library can be found in its associated RFC.

Currently, libc has two active branches: main for the upcoming v1.0 release, and libc-0.2 for the currently published version. By default all pull requests should target main; once reviewed, they can be cherry picked to the libc-0.2 branch if needed.

We will stop making new v0.2 releases once v1.0 is released.

See the section in CONTRIBUTING.md for more details.

Add the following to your Cargo.toml:

[dependencies]
libc = "0.2"

• std: by default libc links to the standard library. Disable this feature to remove this dependency and be able to use libc in #![no_std] crates.

• extra_traits: all structs implemented in libc are Copy and Clone. This feature derives Debug, Eq, Hash, and PartialEq.

The minimum supported Rust toolchain version is currently Rust 1.65.

Increases to the MSRV are allowed to change without a major (i.e. semver- breaking) release in order to avoid a ripple effect in the ecosystem. A policy for when this may change is a work in progress.

libc may continue to compile with Rust versions older than the current MSRV but this is not guaranteed.

You can see the platform(target)-specific docs on docs.rs, select a platform you want to see.

See ci/verify-build.py for the platforms on which libc is guaranteed to build for each Rust toolchain. The test matrices at GitHub Actions show the platforms in which libc tests are run.

This project is licensed under either of

• Apache License, Version 2.0 (LICENSE-APACHE)

• MIT License (LICENSE-MIT)

at your option.

We welcome all people who want to contribute. Please see the contributing instructions for more information.

Contributions in any form (issues, pull requests, etc.) to this project must adhere to Rust's Code of Conduct.

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in libc by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.

dependencies {
    implementation("io.github.kotlinmania:libc-kotlin:0.1.10")
}

./gradlew build
./gradlew test

• macOS arm64
• Linux x64
• Windows mingw-x64
• iOS arm64 / simulator-arm64 (Swift export + XCFramework)
• JS (browser + Node.js)
• Wasm-JS (browser + Node.js)
• Android (API 24+)

See AGENTS.md and CLAUDE.md for translator discipline, port-lint header convention, and Rust → Kotlin idiom mapping.

This Kotlin port is distributed under the same MIT license as the upstream rust-lang/libc. See LICENSE (and any sibling LICENSE-* / NOTICE files mirrored from upstream) for the full text.

Original work copyrighted by the libc authors.
Kotlin port: Copyright (c) 2026 Sydney Renee and The Solace Project.

Thanks to the rust-lang/libc maintainers and contributors for the original Rust implementation. This port reproduces their work in Kotlin Multiplatform; bug reports about upstream design or behavior should go to the upstream repository.