A Linux io_uring API, using rustix

This is a Linux io_uring userspace interface for Rust. It is higher-level than the userspace boundary API, but lower-level than an async runtime.

This library derived from the io_uring crate, and is modified to use rustix to perform the system calls.

Usage

To use the rustix-uring crate, first add this to your Cargo.toml:

[dependencies]
rustix-uring = "0.4"

Next we can start using the rustix-uring crate. The following is quick introduction using Read for file.

use rustix_uring::{opcode, types, IoUring};
use std::os::unix::io::AsRawFd;
use std::{fs, io};

fn main() -> io::Result<()> {
    let mut ring = IoUring::new(8)?;

    let fd = fs::File::open("README.md")?;
    let mut buf = vec![0; 1024];

    let read_e = opcode::Read::new(types::Fd(fd.as_raw_fd()), buf.as_mut_ptr(), buf.len() as _)
        .build()
        .user_data(0x42);

    // Note that the developer needs to ensure
    // that the entry pushed into submission queue is valid (e.g. fd, buffer).
    unsafe {
        ring.submission()
            .push(&read_e)
            .expect("submission queue is full");
    }

    ring.submit_and_wait(1)?;

    let cqe = ring.completion().next().expect("completion queue is empty");

    assert_eq!(cqe.user_data().u64_(), 0x42);
    let _bytes_read = cqe.result().expect("read error");

    Ok(())
}

Note that opcode Read is only available after kernel 5.6. If you use a kernel lower than 5.6, this example will fail.

Test and Benchmarks

You can run the test and benchmark of the library with the following commands.

$ cargo run --package io-uring-test
$ cargo bench --package io-uring-bench

License

This project is licensed under either of

• Apache License, Version 2.0, (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)
• MIT license (LICENSE-MIT or http://opensource.org/licenses/MIT)

at your option.

Contribution

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in io-uring by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.