Example 1
#include <signal.h>
#include ”ace/Reactor.h”
#include ”ace/Event_Handler.h”

//Create our subclass to handle the signal events
//that we wish to handle. Since we know that this particular
//event handler is going to be using signals we only overload the
//handle_signal method.

class
MyEventHandler: public ACE_Event_Handler{
int
handle_signal(int signum, siginfo_t*,ucontext_t*){
 switch(signum){
  case SIGWINCH:
   ACE_DEBUG((LM_DEBUG, ”You pressed SIGWINCH \n”));
   break;

  case SIGINT:
   ACE_DEBUG((LM_DEBUG, ”You pressed SIGINT \n”));
   break;
   }
 return 0;
 }
};

int main(int argc, char *argv[]){
 //instantiate the handler
 MyEventHandler *eh =new MyEventHandler;

//Register the handler asking to call back when either SIGWINCH
//or SIGINT signals occur. Note that in both the cases we asked the
//Reactor to call back the same Event_Handler i.e., MyEventHandler.
//This is the reason why we had to write a switch statement in the handle_signal() method above. Also note that the //ACE_Reactor is being used as a Singleton object (Singleton pattern)

 ACE_Reactor::instance()->register_handler(SIGWINCH,eh);
 ACE_Reactor::instance()->register_handler(SIGINT,eh);
 while(1)
  //Start the reactors event loop
  ACE_Reactor::instance()->handle_events();
}

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