#include <iostream>
#include <unistd.h>

using namespace std;

void Handler1(void) {
    cout << endl;
    cout << "A call to Handler 1" << endl;
    cout << endl;
    return;
}

void Handler2(void) {
    cout << endl;
    cout << "A call to Handler 2" << endl;
    cout << endl;
    return;
}

void Handler3(int code, void * data) {
    cout << endl;
    cout << "Handler 3 called  status= " << code 
         << " data= " << reinterpret_cast<unsigned long>(data) << endl;
    cout << endl;
    return;
}

void Handler4(int code, void * data) {
    cout << endl;
    cout << "Handler 4 called  status= " << code 
         << " data= " << static_cast<int *> (data) 
         << " *data = " << *(static_cast<int*>(data)) << endl;
    cout << endl;
    return;
}


// I need this in the global space as the local variables have gone out
// of scope when the exit function is called.

int value = 7;

int main() {


    atexit(Handler1);
    atexit(Handler1);
    atexit(Handler2);
    atexit(Handler1);

    on_exit(Handler3, reinterpret_cast<void *>(42));
    on_exit(Handler4, static_cast<void *> (&value));

    return 5;

}