boost.asio如何发现我的服务器应用正在侦听哪个端口？

#include<boost/asio.hpp>

int main() {
  boost::asio::io_context io_context;
  boost::asio::ip::tcp::acceptor acceptor(io_context, boost::asio::ip::tcp::endpoint(boost::asio::ip::tcp::v4(), 0));
  boost::asio::ip::tcp::endpoint local_endpoint = acceptor.local_endpoint();
  std::cout << "Listening on port: "<< local_endpoint.port()<< std::endl;
}

#include<boost/asio.hpp>

int main() {
  boost::asio::io_context io_context;
  boost::asio::ip::tcp::acceptor acceptor(io_context, boost::asio::ip::tcp::endpoint(boost::asio::ip::tcp::v4(), 0));
  boost::asio::ip::tcp::socket socket(io_context);
  acceptor.accept(socket);
  boost::asio::ip::tcp::endpoint local_endpoint = socket.local_endpoint();
  std::cout << "Listening on port: "<< local_endpoint.port()<< std::endl;
}