The C libffi library provides two main facilities: assembling calls to functions dynamically, and creating closures that can be called as ordinary C functions. This is an undocumented wrapper, generated by bindgen, intended as the basis for higher-level bindings, but you can see the C libffi documentation.
See the libffi crate for a higher-level API.
It’s on crates.io, but before you build it, make sure you have the dependencies installed first:
An up-to-date version of C libffi Version 3.2.1 is known to work. Earlier versions, such as the versions that come with Mac OS and Fedora, are known not to; neither will the version installed by Homebrew (3.0.13).
pkg-config,
which you probably already have if you’re on Linux. For Mac users,
the version installed by Homebrew is up to date. (I don’t know how
this works on Windows; contact me if you’d like to help figure it
out.)
Then add
toml
[dependencies]
libffi-sys = "0.3.3"
to your Cargo.toml and
rust
extern crate libffi_sys;
to your crate root.