catcher.cpp

URL: https://mirkwood.cs.edinboro.edu/~bennett/class/cmsc4000/spring2026/notes/signal/code/catcher.cpp

 
#include <iostream>
#include <stdio.h>
#include <signal.h>

using namespace std;


static void Handler(int sig);
static void Killer(int sig);

void SetHandler(int sig, void (*hand)(int) );


int main() {
    cout << endl;
    cout << "My process id is " << getpid() << endl;
    cout << endl;

    SetHandler(SIGUSR1, Handler);
    SetHandler(SIGUSR2, Killer);
    SetHandler(SIGKILL, Handler);

    while(1) {
    }

    return 0;
}

void SetHandler(int sig, void (*hand)(int) ) {
   if (SIG_ERR == signal(sig, hand) ) {
      string error{"Failed to set signal " + to_string(sig) + " : "};
      perror(error.c_str());
   }
}

static void Killer(int sig){
    cout << "Just got " << sig << endl;
    cout << "And I will exit." << endl;
    exit(0);
}

static void Handler(int sig) {
   cout << "I just got a signal " << sig << endl;
   cout << endl;
}