diff --git a/coreapi/help/realtimetext_sender.c b/coreapi/help/realtimetext_sender.c
index 9ab25545b..8995196f0 100644
--- a/coreapi/help/realtimetext_sender.c
+++ b/coreapi/help/realtimetext_sender.c
@@ -112,9 +112,14 @@ int main(int argc, char *argv[]){
 	/* main loop for sending message and doing background linphonecore work: */
 	while(running){
 		char character;
-		system ("/bin/stty raw"); /*to disable terminal buffering*/
+		/*to disable terminal buffering*/
+		if (system ("/bin/stty raw") == -1){
+			ms_error("/bin/stty error");
+		}
 		character = getchar();
-		system ("/bin/stty cooked");
+		if (system("/bin/stty cooked") == -1){
+			ms_error("/bin/stty error");
+		}
 		if (character==0x03) {/*CTRL C*/
 			running=0;
 			break;
diff --git a/mediastreamer2 b/mediastreamer2
index 8799e7b89..0780ed678 160000
--- a/mediastreamer2
+++ b/mediastreamer2
@@ -1 +1 @@
-Subproject commit 8799e7b89e11d46aebfec8e948de3bf8e754e2ec
+Subproject commit 0780ed6788e5224617b62a34b190a1a7197cd50f