third_party/rust_crates/vendor/async-net/README.md

# async-net

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Async networking primitives for TCP/UDP/Unix communication.

This crate is an async version of [`std::net`] and [`std::os::unix::net`].

[`std::net`]: https://doc.rust-lang.org/std/net/index.html
[`std::os::unix::net`]: https://doc.rust-lang.org/std/os/unix/net/index.html

## Implementation

This crate uses [`async-io`] for async I/O and [`blocking`] for DNS lookups.

[`async-io`]: https://docs.rs/async-io
[`blocking`]: https://docs.rs/blocking

## Examples

A simple UDP server that echoes messages back to the sender:

```rust
use async_net::UdpSocket;

let socket = UdpSocket::bind("127.0.0.1:8080").await?;
let mut buf = vec![0u8; 1024];

loop {
    let (n, addr) = socket.recv_from(&mut buf).await?;
    socket.send_to(&buf[..n], &addr).await?;
}
```

## License

Licensed under either of

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

at your option.

#### Contribution

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