TcpListener in std::net - Rust (original) (raw)

pub struct TcpListener(_);

Expand description

A TCP socket server, listening for connections.

After creating a TcpListener by binding it to a socket address, it listens for incoming TCP connections. These can be accepted by calling accept or by iterating over the Incoming iterator returned by incoming.

The socket will be closed when the value is dropped.

The Transmission Control Protocol is specified in IETF RFC 793.

use std:🥅:{TcpListener, TcpStream};

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

fn main() -> std::io::Result<()> {
    let listener = TcpListener::bind("127.0.0.1:80")?;

    // accept connections and process them serially
    for stream in listener.incoming() {
        handle_client(stream?);
    }
    Ok(())
}

Run

Creates a new TcpListener which will be bound to the specified address.

The returned listener is ready for accepting connections.

Binding with a port number of 0 will request that the OS assigns a port to this listener. The port allocated can be queried via theTcpListener::local_addr method.

The address type can be any implementor of ToSocketAddrs trait. See its documentation for concrete examples.

If addr yields multiple addresses, bind will be attempted with each of the addresses until one succeeds and returns the listener. If none of the addresses succeed in creating a listener, the error returned from the last attempt (the last address) is returned.

Creates a TCP listener bound to 127.0.0.1:80:

use std:🥅:TcpListener;

let listener = TcpListener::bind("127.0.0.1:80").unwrap();

Run

Creates a TCP listener bound to 127.0.0.1:80. If that fails, create a TCP listener bound to 127.0.0.1:443:

use std:🥅:{SocketAddr, TcpListener};

let addrs = [
    SocketAddr::from(([127, 0, 0, 1], 80)),
    SocketAddr::from(([127, 0, 0, 1], 443)),
];
let listener = TcpListener::bind(&addrs[..]).unwrap();

Run

Returns the local socket address of this listener.

use std:🥅:{Ipv4Addr, SocketAddr, SocketAddrV4, TcpListener};

let listener = TcpListener::bind("127.0.0.1:8080").unwrap();
assert_eq!(listener.local_addr().unwrap(),
           SocketAddr::V4(SocketAddrV4::new(Ipv4Addr::new(127, 0, 0, 1), 8080)));

Run

Creates a new independently owned handle to the underlying socket.

The returned TcpListener 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.

use std:🥅:TcpListener;

let listener = TcpListener::bind("127.0.0.1:8080").unwrap();
let listener_clone = listener.try_clone().unwrap();

Run

Accept a new incoming connection from this listener.

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

use std:🥅:TcpListener;

let listener = TcpListener::bind("127.0.0.1:8080").unwrap();
match listener.accept() {
    Ok((_socket, addr)) => println!("new client: {:?}", addr),
    Err(e) => println!("couldn't get client: {:?}", e),
}

Run

Returns an iterator over the connections being received on this listener.

The returned iterator will never return None and will also not yield the peer’s SocketAddr structure. Iterating over it is equivalent to calling TcpListener::accept in a loop.

use std:🥅:{TcpListener, TcpStream};

fn handle_connection(stream: TcpStream) {
   //...
}

fn main() -> std::io::Result<()> {
    let listener = TcpListener::bind("127.0.0.1:80").unwrap();

    for stream in listener.incoming() {
        match stream {
            Ok(stream) => {
                handle_connection(stream);
            }
            Err(e) => { /* connection failed */ }
        }
    }
    Ok(())
}

Run

🔬 This is a nightly-only experimental API. (tcplistener_into_incoming #88339)

Turn this into an iterator over the connections being received on this listener.

The returned iterator will never return None and will also not yield the peer’s SocketAddr structure. Iterating over it is equivalent to calling TcpListener::accept in a loop.

#![feature(tcplistener_into_incoming)]
use std:🥅:{TcpListener, TcpStream};

fn listen_on(port: u16) -> impl Iterator<Item = TcpStream> {
    let listener = TcpListener::bind("127.0.0.1:80").unwrap();
    listener.into_incoming()
        .filter_map(Result::ok) /* Ignore failed connections */
}

fn main() -> std::io::Result<()> {
    for stream in listen_on(80) {
        /* handle the connection here */
    }
    Ok(())
}

Run

Sets the value for the IP_TTL option on this socket.

This value sets the time-to-live field that is used in every packet sent from this socket.

use std:🥅:TcpListener;

let listener = TcpListener::bind("127.0.0.1:80").unwrap();
listener.set_ttl(100).expect("could not set TTL");

Run

Gets the value of the IP_TTL option for this socket.

For more information about this option, see TcpListener::set_ttl.

use std:🥅:TcpListener;

let listener = TcpListener::bind("127.0.0.1:80").unwrap();
listener.set_ttl(100).expect("could not set TTL");
assert_eq!(listener.ttl().unwrap_or(0), 100);

Run

👎 Deprecated since 1.16.0:

this option can only be set before the socket is bound

👎 Deprecated since 1.16.0:

this option can only be set before the socket is bound

Gets the value of the SO_ERROR option on this socket.

This will retrieve the stored error in the underlying socket, clearing the field in the process. This can be useful for checking errors between calls.

use std:🥅:TcpListener;

let listener = TcpListener::bind("127.0.0.1:80").unwrap();
listener.take_error().expect("No error was expected");

Run

Moves this TCP stream 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.

On Unix platforms, calling this method corresponds to calling fcntl FIONBIO. On Windows calling this method corresponds to callingioctlsocket FIONBIO.

Bind a TCP listener to an address, listen for connections, and read bytes in nonblocking mode:

use std::io;
use std:🥅:TcpListener;

let listener = TcpListener::bind("127.0.0.1:7878").unwrap();
listener.set_nonblocking(true).expect("Cannot set non-blocking");

for stream in listener.incoming() {
    match stream {
        Ok(s) => {
            // do something with the TcpStream
            handle_connection(s);
        }
        Err(ref e) if e.kind() == io::ErrorKind::WouldBlock => {
            // wait until network socket is ready, typically implemented
            // via platform-specific APIs such as epoll or IOCP
            wait_for_fd();
            continue;
        }
        Err(e) => panic!("encountered IO error: {}", e),
    }
}

Run

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

This is supported on Unix only.

Borrows the file descriptor. Read more

This is supported on Unix only.

Extracts the raw file descriptor. Read more

Extracts the underlying raw socket from this object.

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

Borrows the socket.

Formats the value using the given formatter. Read more

This is supported on Unix only.

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

Creates a new I/O object from the given raw socket. Read more

This is supported on Unix only.

Consumes this object, returning the raw underlying file descriptor. Read more

Consumes this object, returning the raw underlying socket. Read more

impl Any for T where

T: 'static + ?Sized,

Immutably borrows from an owned value. Read more

Mutably borrows from an owned value. Read more

impl From for T

impl<T, U> Into for T where

U: From,

The type returned in the event of a conversion error.

Performs the conversion.

The type returned in the event of a conversion error.

Performs the conversion.