#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdbool.h>
#include <signal.h>

void f(int);    // prototype for signal handler 
void g(int);    // prototype for signal handler 

bool keep_going = true;


int main(int argc, char* argv[]){
	

	signal(SIGINT, f);  // install handler
	signal(SIGUSR1, g); //

	while( keep_going ){
		// do nothing...
	
	}

	printf("go out of the infinite loop!\n");
	return 0;
}

void f(int signum){
	printf("\n\n\nsignal handler called with input %d\n\n\n", signum);
	if(signum == 2)
		keep_going = false;
}

void g(int sn){
	printf("\n\n\nuser defined  %d\n\n\n", sn);
 exit(sn);
}