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

void sigusr1(int);    // prototype for signal handler 
void ctrl_c(int);     // prototype for signal handler 

bool keep_going;


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

	signal(SIGINT, ctrl_c);    // install handler
	signal(SIGUSR1, sigusr1);  //

	perror("enter loop 1");
	keep_going = true;
	while( keep_going ){	}
	perror("finish loop 1");

	perror("enter loop 2");
	keep_going = true;
	while( keep_going ){	}
	perror("finish loop 2");


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

void ctrl_c(int signum){
	printf("\n\n\nctrl-c signal received : %d\n\n\n", signum);
	for(int i=0; i<25; i+=1){
		sleep(1); 
		fprintf(stderr, ".");
	}
}

void sigusr1(int sn){
	printf("\n\n\nusr1 signal received : %d\n\n\n", sn);
	for(int i=0; i<25; i+=1){
		sleep(1); 
		fprintf(stderr, ".");
	}
}