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net/server/listen-unused: simpler and with IPv6 support. #690

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net/server/listen-unused: simpler and with IPv6 support. #690

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10 changes: 4 additions & 6 deletions src/net/server/listen-unused.md
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Expand Up @@ -3,17 +3,15 @@
[![std-badge]][std] [![cat-net-badge]][cat-net]

In this example, the port is displayed on the console, and the program will
listen until a request is made. `SocketAddrV4` assigns a random port when
setting port to 0.
listen until a request is made. `TcpListener::bind` uses a random port
allocated by the OS when requested to bind to port 0.

```rust,edition2018,no_run
use std::net::{SocketAddrV4, Ipv4Addr, TcpListener};
use std::net::TcpListener;
use std::io::{Read, Error};

fn main() -> Result<(), Error> {
let loopback = Ipv4Addr::new(127, 0, 0, 1);
let socket = SocketAddrV4::new(loopback, 0);
let listener = TcpListener::bind(socket)?;
let listener = TcpListener::bind("localhost:0")?;
let port = listener.local_addr()?;
println!("Listening on {}, access this port to end the program", port);
let (mut tcp_stream, addr) = listener.accept()?; //block until requested
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