===================================================================
RCS file: /cvsrepo/anoncvs/cvs/src/usr.bin/tmux/server-client.c,v
retrieving revision 1.119
retrieving revision 1.120
diff -u -r1.119 -r1.120
--- src/usr.bin/tmux/server-client.c	2014/02/23 00:53:06	1.119
+++ src/usr.bin/tmux/server-client.c	2014/04/16 08:02:31	1.120
@@ -1,4 +1,4 @@
-/* $OpenBSD: server-client.c,v 1.119 2014/02/23 00:53:06 nicm Exp $ */
+/* $OpenBSD: server-client.c,v 1.120 2014/04/16 08:02:31 nicm Exp $ */
 
 /*
  * Copyright (c) 2009 Nicholas Marriott <nicm@users.sourceforge.net>
@@ -118,6 +118,11 @@
 {
 	if (c->flags & CLIENT_CONTROL)
 		return (0);
+
+	if (strcmp(c->ttyname, "/dev/tty") == 0) {
+		*cause = xstrdup("can't use /dev/tty");
+		return (-1);
+	}
 
 	if (!(c->flags & CLIENT_TERMINAL)) {
 		*cause = xstrdup("not a terminal");