--- runtime/staprun/mainloop.c-dist	2007-04-24 18:38:24.000000000 +0200
+++ runtime/staprun/mainloop.c	2007-04-24 18:39:20.000000000 +0200
@@ -300,7 +300,9 @@ int stp_main_loop(void)
 		switch (type) { 
 #ifdef STP_OLD_TRANSPORT
 		case STP_REALTIME_DATA:
-			write(out_fd[0], data, nb - sizeof(int));
+			if (write(out_fd[0], data, nb - sizeof(int)) !=
+				(ssize_t)(nb - sizeof(int)))
+				fprintf(stderr, "WARNING: short STP_REALTIME_DATA written\n");
                         break;
 #endif
 		case STP_OOB_DATA: