Working example of unix domain socket in Rust (rustc 1.26.0-beta.18); c.f. http://www.cs.brandeis.edu/~cs146a/rust/rustbyexample-02-21-2015/sockets.html

client.rs

// client.rs

use std::env;
use std::io::Write;
use std::os::unix::net::UnixStream;
use std::path::Path;

use common::SOCKET_PATH;

mod common;

fn main() {
    let messages: Vec<String> = env::args().skip(1).map(|x| x.to_string()).collect();
    let socket = Path::new(SOCKET_PATH);

    for message in messages {
        // Connect to socket
        let mut stream = match UnixStream::connect(&socket) {
            Err(_) => panic!("server is not running"),
            Ok(stream) => stream,
        };

        // Send message
        match stream.write_all(message.as_bytes()) {
            Err(_) => panic!("couldn't send message"),
            Ok(_) => {}
        }
    }
}

common.rs

// common.rs
pub static SOCKET_PATH: &'static str = "loopback-socket";

server.rs

// server.rs

use std::fs;
use std::io::Read;
use std::os::unix::net::{UnixListener, UnixStream};
use std::path::Path;
use std::thread;

use common::SOCKET_PATH;

mod common;

fn main() {
    let socket = Path::new(SOCKET_PATH);

    // Delete old socket if necessary
    if socket.exists() {
        fs::remove_file(&socket).unwrap();
    }

    // Bind to socket
    let listener = match UnixListener::bind(&socket) {
        Err(_) => panic!("failed to bind socket"),
        Ok(listener) => listener,
    };

    println!("Server started, waiting for clients");

    // accept connections and process them, spawning a new thread for each one
    for stream in listener.incoming() {
        match stream {
            Ok(stream) => {
                /* connection succeeded */
                thread::spawn(|| handle_client(stream));
            }
            Err(_) => {
                /* connection failed */
                break;
            }
        }
    }
}


fn handle_client(mut stream: UnixStream) {
    let mut response = String::new();
    stream.read_to_string(&mut response).unwrap();
    println!("Client said: {}", response);
}