rest - C++ boost bad file descriptor -

above code im using calling browser , other client. doesnt seem work. there wrong? want know on ip im running server , how can used create restful webservice.

#include <ctime> #include <iostream>  #include <string> #include <boost/asio.hpp>  using boost::asio::ip::tcp; using namespace std;  std::string make_daytime_string() {     using namespace std; // time_t, time , ctime;     time_t = time(0);     return ctime(&now); }  int main() {     try {         boost::asio::io_service io_service;          tcp::acceptor acceptor(io_service, tcp::endpoint(tcp::v4(), 13));          (;;) {             cout << "listening socket" << endl;             tcp::socket socket(io_service);             acceptor.accept(socket);              cout << "listening socket" << endl;             std::string message = make_daytime_string();              boost::system::error_code ignored_error;             boost::asio::write(socket, boost::asio::buffer(message), ignored_error);         }     } catch (std::exception &e) {         std::cerr << e.what() << std::endl;     } } 

i'd guess not running program sufficient permission open privileged (<1024) port 13.

trying 1313 works me (without administrative privileges)