Linux IO Uring

The low-level io_uring userspace interface for Rust.

Usage

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

toml [dependencies] io-uring = "0.6"

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

```rust 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 _)
    .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(), 0x42);
assert!(cqe.result() >= 0, "read error: {}", cqe.result());

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.