Rust FFI

Purpose

Guide agents through Rust's Foreign Function Interface: calling C from Rust with bindgen, exporting Rust to C with cbindgen, writing safe wrappers, linking libraries via build.rs, and structuring sys crates.

Triggers

• "How do I call a C library from Rust?"
• "How do I use bindgen to generate Rust bindings?"
• "How do I export Rust functions to be called from C?"
• "How do I write a safe wrapper around an unsafe C API?"
• "How do I link a system library in Rust?"
• "What is a sys crate and how do I structure one?"

Workflow

1. Calling C without bindgen (manual declarations)