posctl: command without feedback will cause false error message

posctl.cc

@@ -968,11 +968,14 @@ int PosCtl::ReadTTY (char * inbuf, int length) {
 	}
 	
 	if (len < 0) {
-		printf ("%s:%d could not read data from device:%s Error:%s\n", __FILE__, __LINE__,
+		if (errno != EAGAIN) {
-				device.c_str(), strerror(errno));
+
+			printf ("%s:%d could not read data from device:%s Error:(%d) %s\n", __FILE__, __LINE__,
+					device.c_str(), errno, strerror(errno));
 			errormessage_display ((char *)"window-posctl", (char *)"ReadTTY",
 					(char *) "%s:%d could not read data from device:%s Error:%s\n", __FILE__, __LINE__,
 					device.c_str(), strerror(errno));
+		}
 		inbuf[0] = 0;
 	}
 	else {