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sigs.cpp

This is an example of handling unix signals with SUE. What does this program do is intercepting SIGINT (Ctrl-C) and SIGQUIT (Ctrl-\); try pressing Ctrl-C to see it works, and press Ctrl-\ to cause the program to exit.

/*
   This demo program waits for a signal. Upon SIGINT (Ctrl-C) it 
   prints a message telling you how much times you did this and
   advicing you to press Ctrl-\ instead (to generate SIGQUIT). 

   Having SIGQUIT, it exits.
*/

#include <stdio.h>
#include <signal.h>
#include "sue_sel.hpp"

class SigquitHandler : public SUESignalHandler {
    SUEEventSelector *selector;
public:
    SigquitHandler(SUEEventSelector *a_sel) 
      : SUESignalHandler(SIGQUIT) { selector = a_sel; }
    ~SigquitHandler() {}
    virtual void SignalHandle() { selector->Break(); }
};

class SigintHandler : public SUESignalHandler {
    int count;
public:
    SigintHandler() : SUESignalHandler(SIGINT) { count = 0; }
    ~SigintHandler() {}
    virtual void SignalHandle() {  
        printf("You've pressed Ctrl-C %d time(s). Press Ctrl-\\ instead!\n", 
               ++count);
    }
};

int main() 
{
    SUEEventSelector selector;
    SigquitHandler quithandler(&selector);
    SigintHandler inthandler;
    selector.RegisterSignalHandler(&quithandler);
    selector.RegisterSignalHandler(&inthandler);
    printf("Entering the main loop... \n");
    selector.Go();
    printf("Main loop exited\n");
    return 0;
}

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