c-gull

c-gull is a libc implementation. It is an implementation of the ABI described by the [libc] crate.

It is implemented in terms of crates written in Rust, such as [c-scape], [rustix], [origin], [sync-resolve], [libm], [realpath-ext], [tz-rs], [printf-compat], and [rand].

Currently it only supports *-*-linux-gnu ABIs, though other ABIs could be added in the future. And currently this mostly focused on features needed by Rust programs, so it doesn't have many C-idiomatic things like printf yet, but they could be added in the future.

The goal is to have very little code in c-gull itself, by factoring out all of the significant functionality into independent crates with more Rust-idiomatic APIs, with c-gull just wrapping those APIs to implement the C ABIs.

This is currently highly experimental, incomplete, and some things aren't optimized.

This is part of the [Mustang] project, building Rust programs written entirely in Rust.

Using c-gull in non-mustang programs

c-gull can also be used as a drop-in (partial) libc replacement in non-mustang builds, provided you're using nightly Rust. To use it, just change your typical libc dependency in Cargo.toml to this:

toml libc = { version = "<c-gull version>", package = "c-gull" }

and c-gull will replace as many of the system libc implementation with its own implementations as it can. In particular, it can't replace malloc or any of the pthread functions in this configuration, but it can replace many other things.

See the [libc-replacement example] for more details.