diff --git a/TP4/Exo1/pi.c b/TP4/Exo1/pi.c
index ce51312..87e41c8 100644
--- a/TP4/Exo1/pi.c
+++ b/TP4/Exo1/pi.c
@@ -13,18 +13,24 @@ uint64_t shots = 0,
 double pi = 0,
 	   t1;
 
+sigset_t alset, intset, quitset;
+
 void alarm_handler(int)
 {
+	sigprocmask(SIG_BLOCK, &alset, NULL);
 	printf("pi = %f\n", pi);
 	printf("le nombre de tirs est de %f\n", (double)shots);
 	alarm(5);
+	sigprocmask(SIG_UNBLOCK, &alset, NULL);
 }
 
 void int_handler(int)
 {
-	char c;
-
 	alarm(0);
+
+	sigprocmask(SIG_BLOCK, &intset, NULL);
+
+	char c;
 	printf("Voulez-vous quitter ? (y/n)\n");
 	c = getchar();
 
@@ -33,15 +39,20 @@ void int_handler(int)
 		printf("Le temps écoulé est de %f\n", tstamp() - t1);
 		exit(0);
 	}
-
+	return;
+	sigprocmask(SIG_UNBLOCK, &intset, NULL);
 	alarm(5);
 }
 
 void quit_handler(int)
 {
+	alarm(0);
+	sigprocmask(SIG_BLOCK, &quitset, NULL);
 	shots = 0;
 	shots_in = 0;
 	t1 = tstamp();
+	sigprocmask(SIG_UNBLOCK, &quitset, NULL);
+	alarm(5);
 }
 
 int main(int argc, char *argv[])
@@ -49,6 +60,12 @@ int main(int argc, char *argv[])
 	double x, y;
 	t1 = tstamp();
 	alarm(5);
+	sigaddset(&alset, SIGINT);
+	sigaddset(&alset, SIGQUIT);
+	sigaddset(&intset, SIGALRM);
+	sigaddset(&intset, SIGQUIT);
+	sigaddset(&quitset, SIGALRM);
+	sigaddset(&quitset, SIGINT);
 	set_signal_handler(SIGALRM, &alarm_handler);
 	set_signal_handler(SIGINT, &int_handler);
 	set_signal_handler(SIGQUIT, &quit_handler);
@@ -61,7 +78,7 @@ int main(int argc, char *argv[])
 
 		if ((x * x + y * y) <= 1)
 			shots_in++;
-		
+
 		pi = 4 * (double)(shots_in) / shots;
 	}
 }