libc - Raw FFI bindings to platforms' system libraries
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.
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.
More detailed information about the design of this library can be found in its associated RFC.
Add the following to your
 = "0.2"
std: by default
libclinks to the standard library. Disable this feature to remove this dependency and be able to use
structs implemented in
Clone. This feature derives
const-extern-fn: Changes some
extern fns into
const extern fns. If you use Rust >= 1.62, this feature is implicitly enabled. Otherwise it requires a nightly rustc.
use_stdis deprecated, and is equivalent to
Rust version support
The minimum supported Rust toolchain version is currently Rust 1.13.0. (libc does not currently have any policy regarding changes to the minimum supported Rust version; such policy is a work in progress.) APIs requiring newer Rust features are only available on newer Rust toolchains:
Platform-specific documentation (master branch).
for the platforms on which
libc is guaranteed to build for each Rust
toolchain. The test-matrix at GitHub Actions and Cirrus CI show the
platforms in which
libc tests are run.
This project is licensed under either of
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.