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rust-ffi

Use when calling C libraries from Rust, generating bindings with bindgen, exporting Rust functions to C with cbindgen, writing safe wrappers over unsafe FFI, or linking system libraries.

.devin/skills/rust-ffi/SKILL.md

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# Rust FFI

Rust calls C through `unsafe extern` blocks and exports to C through `extern "C"` functions. The unsafe surface stays at the boundary; everything behind it is a safe API.

## Contract

| Field | Bound contract |
|---|---|
| Trigger | Calling a C library from Rust, generating bindings with bindgen, exporting a Rust API to C with cbindgen, wrapping an unsafe FFI boundary in a safe API, or linking a system or vendored C library. |
| Authority | Reversible local. Writes only the target crate's Cargo.toml, build.rs, wrapper header, source files, and the generated C header inside the project. Rollback is version control. No remote mutation. |
| Side effect | Creates or edits crate build and source files; bindgen output lands in `OUT_DIR`, cbindgen output at the named header path. |
| Done | `cargo build` succeeds, the FFI boundary is declared or generated, and every unsafe call sits behind a safe wrapper or an exported `extern "C"` function. |

## Inputs