Struct std::net::TcpListener
1.0.0·
source ·
[−]pub struct TcpListener(_);
Expand description
A TCP socket server, listening for connections.
After creating a TcpListener
by bind
ing 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.
Examples
use std::net::{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(())
}
RunImplementations
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 the
TcpListener::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.
Examples
Creates a TCP listener bound to 127.0.0.1:80
:
use std::net::TcpListener;
let listener = TcpListener::bind("127.0.0.1:80").unwrap();
RunCreates 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::net::{SocketAddr, TcpListener};
let addrs = [
SocketAddr::from(([127, 0, 0, 1], 80)),
SocketAddr::from(([127, 0, 0, 1], 443)),
];
let listener = TcpListener::bind(&addrs[..]).unwrap();
RunReturns the local socket address of this listener.
Examples
use std::net::{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)));
RunCreates 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.
Examples
use std::net::TcpListener;
let listener = TcpListener::bind("127.0.0.1:8080").unwrap();
let listener_clone = listener.try_clone().unwrap();
RunAccept 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.
Examples
use std::net::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),
}
RunReturns 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.
Examples
use std::net::{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(())
}
RunTurn 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.
Examples
#![feature(tcplistener_into_incoming)]
use std::net::{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(())
}
RunGets the value of the IP_TTL
option for this socket.
For more information about this option, see TcpListener::set_ttl
.
Examples
use std::net::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);
Runthis option can only be set before the socket is bound
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.
Examples
use std::net::TcpListener;
let listener = TcpListener::bind("127.0.0.1:80").unwrap();
listener.take_error().expect("No error was expected");
RunMoves 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 calling
ioctlsocket
FIONBIO
.
Examples
Bind a TCP listener to an address, listen for connections, and read bytes in nonblocking mode:
use std::io;
use std::net::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),
}
}
RunTrait Implementations
Extracts the underlying raw socket from this object.
Borrows the socket.
Performs the conversion.
Performs the conversion.
Performs the conversion.
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
Consumes this object, returning the raw underlying file descriptor. Read more
Consumes this object, returning the raw underlying socket. Read more