--- um.orig/arch/um/drivers/chan_kern.c	2004-07-26 11:43:52.000000000 -0700
+++ um/arch/um/drivers/chan_kern.c	2004-07-31 19:38:51.000000000 -0700
@@ -117,15 +117,15 @@
 {
 	struct termios save, new;
 	int err;
+	int changed = 0;
 
-	if(isatty(fd)){
-		tcgetattr(fd, &save);
+	if(isatty(fd) && tcgetattr(fd, &save) == 0) {
 		new = save;
 		new.c_oflag |= OPOST;
-		tcsetattr(fd, TCSAFLUSH, &new);
+		if(tcsetattr(fd, TCSAFLUSH, &new) == 0) changed = 1;
 	}
 	err = generic_write(fd, buf, n, NULL);
-	if(isatty(fd)) tcsetattr(fd, TCSAFLUSH, &save);
+	if(changed) tcsetattr(fd, TCSAFLUSH, &save);
 	return(err);
 }