/**
 *
 * @File : exo_03.cxx
 *
 * @Author : A. B. Dragut
 *
 * @Synopsis : restauration de l'action précédente complète
 *
 **/
#include <iostream> 
#include <exception>
#include <string>
#include <csignal>         // SIGINT, SIGTSTP

#include <unistd.h>        // pause(), sleep()

#include <signal.h>         // struct sigaction
#include "CExc.h"
#include "nsSysteme.h"

using namespace std;
using namespace nsSysteme;

namespace 
{
    struct sigaction OldAction;

    void Derout1 (int NumSig)
    { 
        cout << "Debut fonction Derout1()" << endl;
        ::sleep (5);
        cout << "Fin fonction Derout1()" << endl;

    } // Derout1()

    void Derout2 (int NumSig)
    { 
        cout << "Debut fonction Derout2()" << endl;
        ::sleep (5);
        Sigaction (NumSig, &OldAction, 0);
        cout << "Fin fonction Derout2()" << endl;

    } // Derout2()

} // namespace anonyme

int main(int argc, char * argv []) {
  try {
    if (argc != 1)
        throw CExc ("main()",string ("Usage : ") + argv [0]);

    struct sigaction Action;

    Action.sa_flags   = 0;
    Action.sa_handler = Derout1;
    sigemptyset (&Action.sa_mask);
    sigaddset   (&Action.sa_mask, SIGTSTP);

    Sigaction (SIGINT, &Action, 0);
    ::pause ();

    Action.sa_handler = Derout2;
    sigemptyset (&Action.sa_mask);

    Sigaction (SIGINT, &Action, &OldAction);

    for (;;);

    return 0;
  }
  catch (const CExc & Exc) {
        cerr <<Exc<< endl;
        return errno;
  }
  catch (const exception & Exc) {
        cerr << "Exception : " << Exc.what () << endl;
        return 1;
  }
  catch (...) {
        cerr << "Exception inconnue recue dans la fonction main()" 
             << endl;
        return 1;
  }


}  //  main ()