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0.0.4 Dec 27, 2019
0.0.3 Nov 8, 2019
0.0.2 Oct 19, 2019
0.0.1 Oct 19, 2019

#1769 in Asynchronous

Used in linux-io-uring


914 lines

Linux IO Uring

github actions crates license license docs.rs

The low-level io_uring userspace interface for Rust.


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

io-uring = "0.6"

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

use io_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 _)

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


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

    assert_eq!(cqe.user_data(), 0x42);
    assert!(cqe.result() >= 0, "read error: {}", cqe.result());


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


This project is licensed under either of

at your option.


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.