136 lines
5.6 KiB
Markdown
136 lines
5.6 KiB
Markdown
libc
|
|
====
|
|
|
|
A Rust library with native bindings to the types and functions commonly found on
|
|
various systems, including libc.
|
|
|
|
[![Build Status](https://travis-ci.org/rust-lang/libc.svg?branch=master)](https://travis-ci.org/rust-lang/libc)
|
|
[![Build status](https://ci.appveyor.com/api/projects/status/34csq3uurnw7c0rl?svg=true)](https://ci.appveyor.com/project/alexcrichton/libc)
|
|
|
|
[Documentation](#platforms-and-documentation)
|
|
|
|
## Usage
|
|
|
|
First, add the following to your `Cargo.toml`:
|
|
|
|
```toml
|
|
[dependencies]
|
|
libc = "0.2"
|
|
```
|
|
|
|
Next, add this to your crate root:
|
|
|
|
```rust
|
|
extern crate libc;
|
|
```
|
|
|
|
Currently libc by default links to the standard library, but if you would
|
|
instead like to use libc in a `#![no_std]` situation or crate you can request
|
|
this via:
|
|
|
|
```toml
|
|
[dependencies]
|
|
libc = { version = "0.2", default-features = false }
|
|
```
|
|
|
|
## What is libc?
|
|
|
|
The primary purpose of this crate is to provide 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 does not strive to have any form of compatibility across platforms,
|
|
but rather it is simply a straight binding to the system libraries on the
|
|
platform in question.
|
|
|
|
## Public API
|
|
|
|
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][rfc].
|
|
|
|
[rfc]: https://github.com/rust-lang/rfcs/blob/master/text/1291-promote-libc.md
|
|
|
|
## Adding an API
|
|
|
|
Want to use an API which currently isn't bound in `libc`? It's quite easy to add
|
|
one!
|
|
|
|
The internal structure of this crate is designed to minimize the number of
|
|
`#[cfg]` attributes in order to easily be able to add new items which apply
|
|
to all platforms in the future. As a result, the crate is organized
|
|
hierarchically based on platform. Each module has a number of `#[cfg]`'d
|
|
children, but only one is ever actually compiled. Each module then reexports all
|
|
the contents of its children.
|
|
|
|
This means that for each platform that libc supports, the path from a
|
|
leaf module to the root will contain all bindings for the platform in question.
|
|
Consequently, this indicates where an API should be added! Adding an API at a
|
|
particular level in the hierarchy means that it is supported on all the child
|
|
platforms of that level. For example, when adding a Unix API it should be added
|
|
to `src/unix/mod.rs`, but when adding a Linux-only API it should be added to
|
|
`src/unix/notbsd/linux/mod.rs`.
|
|
|
|
If you're not 100% sure at what level of the hierarchy an API should be added
|
|
at, fear not! This crate has CI support which tests any binding against all
|
|
platforms supported, so you'll see failures if an API is added at the wrong
|
|
level or has different signatures across platforms.
|
|
|
|
With that in mind, the steps for adding a new API are:
|
|
|
|
1. Determine where in the module hierarchy your API should be added.
|
|
2. Add the API.
|
|
3. Send a PR to this repo.
|
|
4. Wait for CI to pass, fixing errors.
|
|
5. Wait for a merge!
|
|
|
|
### Test before you commit
|
|
|
|
We have two automated tests running on [Travis](https://travis-ci.org/rust-lang/libc):
|
|
|
|
1. [`libc-test`](https://github.com/alexcrichton/ctest)
|
|
- `cd libc-test && cargo run`
|
|
- Use the `skip_*()` functions in `build.rs` if you really need a workaround.
|
|
2. Style checker
|
|
- `rustc ci/style.rs && ./style src`
|
|
|
|
## Platforms and Documentation
|
|
|
|
The following platforms are currently tested and have documentation available:
|
|
|
|
Tested:
|
|
* [`i686-pc-windows-msvc`](https://doc.rust-lang.org/libc/i686-pc-windows-msvc/libc/)
|
|
* [`x86_64-pc-windows-msvc`](https://doc.rust-lang.org/libc/x86_64-pc-windows-msvc/libc/)
|
|
(Windows)
|
|
* [`i686-pc-windows-gnu`](https://doc.rust-lang.org/libc/i686-pc-windows-gnu/libc/)
|
|
* [`x86_64-pc-windows-gnu`](https://doc.rust-lang.org/libc/x86_64-pc-windows-gnu/libc/)
|
|
* [`i686-apple-darwin`](https://doc.rust-lang.org/libc/i686-apple-darwin/libc/)
|
|
* [`x86_64-apple-darwin`](https://doc.rust-lang.org/libc/x86_64-apple-darwin/libc/)
|
|
(OSX)
|
|
* `i686-apple-ios`
|
|
* `x86_64-apple-ios`
|
|
* [`i686-unknown-linux-gnu`](https://doc.rust-lang.org/libc/i686-unknown-linux-gnu/libc/)
|
|
* [`x86_64-unknown-linux-gnu`](https://doc.rust-lang.org/libc/x86_64-unknown-linux-gnu/libc/)
|
|
(Linux)
|
|
* [`x86_64-unknown-linux-musl`](https://doc.rust-lang.org/libc/x86_64-unknown-linux-musl/libc/)
|
|
(Linux MUSL)
|
|
* [`aarch64-unknown-linux-gnu`](https://doc.rust-lang.org/libc/aarch64-unknown-linux-gnu/libc/)
|
|
* [`mips-unknown-linux-gnu`](https://doc.rust-lang.org/libc/mips-unknown-linux-gnu/libc/)
|
|
* [`arm-unknown-linux-gnueabihf`](https://doc.rust-lang.org/libc/arm-unknown-linux-gnueabihf/libc/)
|
|
* [`arm-linux-androideabi`](https://doc.rust-lang.org/libc/arm-linux-androideabi/libc/)
|
|
(Android)
|
|
* [`x86_64-unknown-freebsd`](https://doc.rust-lang.org/libc/x86_64-unknown-freebsd/libc/)
|
|
* [`x86_64-unknown-openbsd`](https://doc.rust-lang.org/libc/x86_64-unknown-openbsd/libc/)
|
|
* [`x86_64-rumprun-netbsd`](https://doc.rust-lang.org/libc/x86_64-unknown-netbsd/libc/)
|
|
|
|
The following may be supported, but are not guaranteed to always work:
|
|
|
|
* `i686-unknown-freebsd`
|
|
* [`x86_64-unknown-bitrig`](https://doc.rust-lang.org/libc/x86_64-unknown-bitrig/libc/)
|
|
* [`x86_64-unknown-dragonfly`](https://doc.rust-lang.org/libc/x86_64-unknown-dragonfly/libc/)
|
|
* [`x86_64-unknown-netbsd`](https://doc.rust-lang.org/libc/x86_64-unknown-netbsd/libc/)
|