INNER CODE UNIT · Rust

pick_free_port

shenmintao/marginalia · desktop/src-tauri/src/lib.rs:130

fn pick_free_port() -> std::io::Result<u16> {
    let listener = std::net::TcpListener::bind("127.0.0.1:0")?;
    let port = listener.local_addr()?.port();
    drop(listener);
    Ok(port)
}

/// Best-effort probe that a configured fixed port is still free before
/// handing it to the sidecar. uvicorn exits immediately on
/// "address already in use" and nothing used to notice — the UI just
/// spun on the health poll forever.
fn port_in_use(host: &str, port: u16) -> bool {
    let mut bind_host = host.trim();
    if bind_host.is_empty() {
        bind_host = "127.0.0.1";
    }
    let addr = if bind_host.contains(':') && !bind_host.starts_with('[') {
        format!("[{}]:{}", bind_host, port)

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