How to handle control-c on tcp / udp enhancement server

Question

How to handle a control-C event or stop my boost :: asio server. I have a combined tcp and udp server and I want to have a clean output when I press ctrl-c. I get a first chance exception for a raw-C control. Here is my code

void startTCP()
{
  http::syncServer::server serv( 2);

 // Set console control handler to allow server to be stopped.
 // console_ctrl_function = boost::bind(&http::syncServer::server::stop, &serv);
 //SetConsoleCtrlHandler(console_ctrl_handler, TRUE);
 // Run the server until stopped.
 serv.run();
}


void startUDP()
{
  boost::asio::io_service io_service;
  http::syncServer::udp_server server(io_service);
 // console_ctrl_function = boost::bind(&http::syncServer::udp_server::stop, &server);
 // SetConsoleCtrlHandler(console_ctrl_handler, TRUE);
 io_service.run();
}

int main(int argc, char* argv[])
{
  try
  {
     boost::shared_ptr<boost::thread> tcpThread( new boost::thread(startTCP));
     boost::shared_ptr<boost::thread> udpThread (new boost::thread(startUDP));

     /*console_ctrl_function = boost::bind(&http::syncServer::udp_server::stop, &server);
     SetConsoleCtrlHandler(console_ctrl_handler, FALSE);*/

    tcpThread->join();
    udpThread->join();
}
catch (std::exception& e)
{
   std::cerr << "exception: " << e.what() << "\n";
}

return 0;
}

Answer 1

The standard C library contains <signal.h>(for example, see here ), with which you can register a signal handler for SIGINT (Ctrl-C). This should do the trick, assuming your platform supports signals.

, SIGTERM, (1) ed.

#include <signal.h> // or <csignal> in C++

void ctrlchandler(int) { /*...*/ WE_MUST_STOP = 1; }
void killhandler(int) { /*...*/ WE_MUST_STOP = 2; }

int WE_MUST_STOP = 0;

int main() {
  signal(SIGINT, ctrlchandler);
  signal(SIGTERM, killhandler);
  /* ... */

  // e.g. main loop like this:
  while(pump_loop() && 0 == WE_MUST_STOP) { }

}

---

, , boost.asio m_io_service.run(). ( , m_io_service) post io .

Answer 2

1.47 signal_set from asio:

class Server {
public:
  Server(...) {
    _signals.add(SIGINT);
    _signals.add(SIGTERM);
    _signals.async_wait(bind(&Server::handle_stop, this));

  }
  void handle_stop() {
    // do what you need to kill the Server - usually you just have to cancel all waits (incl deadline_timers), which will make the io_service exit gracefully
  }
private:
  boost::asio::signal_set _signals;
};

, , . Ubuntu 1,46 - (primo 2012).

,

Answer 3

signal_set asio,

// stop on ctrlC signal

boost::asio::signal_set signals(
    io_service,
    SIGINT,
    SIGTERM );
signals.async_wait(
    boost::bind(
        &boost::asio::io_service::stop,
        &io_service));