Struct std::os::unix::net::UnixListener

pub struct UnixListener(_);

Available on Unix only.

A structure representing a Unix domain socket server.

Examples

use std::thread;
use std::os::unix::net::{UnixStream, UnixListener};

fn handle_client(stream: UnixStream) {
    // ...
}

fn main() -> std::io::Result<()> {
    let listener = UnixListener::bind("/path/to/the/socket")?;

    // 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(err) => {
                /* connection failed */
                break;
            }
        }
    }
    Ok(())
}

Implementations

impl UnixListener

pub fn bind<P: AsRef<Path>>(path: P) -> Result<UnixListener>

Creates a new UnixListener bound to the specified socket.

Examples

use std::os::unix::net::UnixListener;

let listener = match UnixListener::bind("/path/to/the/socket") {
    Ok(sock) => sock,
    Err(e) => {
        println!("Couldn't connect: {e:?}");
        return
    }
};

pub fn bind_addr(socket_addr: &SocketAddr) -> Result<UnixListener>

🔬 This is a nightly-only experimental API. (unix_socket_abstract #85410)

Creates a new UnixListener bound to the specified socket address.

Examples

#![feature(unix_socket_abstract)]
use std::os::unix::net::{UnixListener};

fn main() -> std::io::Result<()> {
    let listener1 = UnixListener::bind("path/to/socket")?;
    let addr = listener1.local_addr()?;

    let listener2 = match UnixListener::bind_addr(&addr) {
        Ok(sock) => sock,
        Err(err) => {
            println!("Couldn't bind: {err:?}");
            return Err(err);
        }
    };
    Ok(())
}

pub fn accept(&self) -> Result<(UnixStream, SocketAddr)>

Accepts a new incoming connection to this listener.

This function will block the calling thread until a new Unix connection is established. When established, the corresponding UnixStream and the remote peer’s address will be returned.

Examples

use std::os::unix::net::UnixListener;

fn main() -> std::io::Result<()> {
    let listener = UnixListener::bind("/path/to/the/socket")?;

    match listener.accept() {
        Ok((socket, addr)) => println!("Got a client: {addr:?}"),
        Err(e) => println!("accept function failed: {e:?}"),
    }
    Ok(())
}

pub fn try_clone(&self) -> Result<UnixListener>

Creates a new independently owned handle to the underlying socket.

The returned UnixListener is a reference to the same socket that this object references. Both handles can be used to accept incoming connections and options set on one listener will affect the other.

Examples

use std::os::unix::net::UnixListener;

fn main() -> std::io::Result<()> {
    let listener = UnixListener::bind("/path/to/the/socket")?;
    let listener_copy = listener.try_clone().expect("try_clone failed");
    Ok(())
}

pub fn local_addr(&self) -> Result<SocketAddr>

Returns the local socket address of this listener.

Examples

use std::os::unix::net::UnixListener;

fn main() -> std::io::Result<()> {
    let listener = UnixListener::bind("/path/to/the/socket")?;
    let addr = listener.local_addr().expect("Couldn't get local address");
    Ok(())
}

pub fn set_nonblocking(&self, nonblocking: bool) -> Result<()>

Moves the socket into or out of nonblocking mode.

This will result in the accept operation becoming nonblocking, i.e., immediately returning from their calls. If the IO operation is successful, Ok is returned and no further action is required. If the IO operation could not be completed and needs to be retried, an error with kind io::ErrorKind::WouldBlock is returned.

Examples

use std::os::unix::net::UnixListener;

fn main() -> std::io::Result<()> {
    let listener = UnixListener::bind("/path/to/the/socket")?;
    listener.set_nonblocking(true).expect("Couldn't set non blocking");
    Ok(())
}

pub fn take_error(&self) -> Result<Option<Error>>

Returns the value of the SO_ERROR option.

Examples

use std::os::unix::net::UnixListener;

fn main() -> std::io::Result<()> {
    let listener = UnixListener::bind("/tmp/sock")?;

    if let Ok(Some(err)) = listener.take_error() {
        println!("Got error: {err:?}");
    }
    Ok(())
}

Platform specific

On Redox this always returns None.

pub fn incoming(&self) -> Incoming<'_>

Returns an iterator over incoming connections.

The iterator will never return None and will also not yield the peer’s SocketAddr structure.

Examples

use std::thread;
use std::os::unix::net::{UnixStream, UnixListener};

fn handle_client(stream: UnixStream) {
    // ...
}

fn main() -> std::io::Result<()> {
    let listener = UnixListener::bind("/path/to/the/socket")?;

    for stream in listener.incoming() {
        match stream {
            Ok(stream) => {
                thread::spawn(|| handle_client(stream));
            }
            Err(err) => {
                break;
            }
        }
    }
    Ok(())
}

Trait Implementations

impl AsFd for UnixListener

fn as_fd(&self) -> BorrowedFd<'_>

🔬 This is a nightly-only experimental API. (io_safety #87074)

Borrows the file descriptor.

impl AsRawFd for UnixListener

fn as_raw_fd(&self) -> RawFd

Extracts the raw file descriptor.

impl Debug for UnixListener

fn fmt(&self, fmt: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl From<OwnedFd> for UnixListener

fn from(fd: OwnedFd) -> UnixListener

Converts to this type from the input type.

impl From<UnixListener> for OwnedFd

fn from(listener: UnixListener) -> OwnedFd

Converts to this type from the input type.

impl FromRawFd for UnixListener

unsafe fn from_raw_fd(fd: RawFd) -> UnixListener

Constructs a new instance of Self from the given raw file descriptor.

impl<'a> IntoIterator for &'a UnixListener

type Item = Result<UnixStream, Error>

The type of the elements being iterated over.

type IntoIter = Incoming<'a>

Which kind of iterator are we turning this into?

fn into_iter(self) -> Incoming<'a>

Creates an iterator from a value.

impl IntoRawFd for UnixListener

fn into_raw_fd(self) -> RawFd

Consumes this object, returning the raw underlying file descriptor.