zola/components/utils/src/net.rs

use std::net::TcpListener;

pub fn get_available_port(avoid: u16) -> Option<u16> {
    // Start after "well-known" ports (0–1023) as they require superuser
    // privileges on UNIX-like operating systems.
    (1024..9000).find(|port| *port != avoid && port_is_available(*port))
}

pub fn port_is_available(port: u16) -> bool {
    TcpListener::bind(("127.0.0.1", port)).is_ok()
}