#include<unistd.h>
#include<stdio.h>
#include<stdlib.h>
#include<signal.h>
#include<stdint.h>
#include<assert.h>

uint64_t shots_in=0,shots=0;
double x,y, pi;

void point(){
    x = rand()/(RAND_MAX*1.0);
	y = rand()/(RAND_MAX*1.0);
	shots ++;
	if ((x*x+y*y)<=1){
		shots_in ++;
	}
    pi = ((double)shots_in)/((double)shots)*4.0;
}

void sig_alarm(int signum){
  printf("pi = %lf\n", pi);
  alarm(5);
}
void sig_int(int signum){
    char reponse;
    printf("voulez vous réellement arrêter le programme ? (y/n)\n");
    scanf("%c", &reponse);
    if (reponse == 'y'){
        exit(0);
    }
}
void sig_quit(int signum){
    shots_in = 0;
    shots = 0;
    point();
}

int set_signal_handler(int signo, void (*handler)(int)) {
    struct sigaction sa;
    sa.sa_handler = handler;    // call `handler` on signal
    sigemptyset(&sa.sa_mask);   // don't block other signals in handler
    sa.sa_flags = SA_RESTART;            //  restart system calls
    return sigaction(signo, &sa, NULL);
}

int main(int argc, char **argv)
{
    shots_in = 0;
    shots = 0;
    
    set_signal_handler(SIGALRM,sig_alarm);
    set_signal_handler(SIGINT, sig_int);
    set_signal_handler(SIGQUIT, sig_quit);
    alarm(5);
    
	for (;;){
        point();
	}	
}