* syscalls.cc (open): Add temporary kludge to avoid assigning the controlling

tty on open unless the open is for stdin/stdout/stderr.
* tty.cc (tty_list::connect): Set ENXIO when can't find a tty.

winsup/cygwin/tty.cc

@@ -103,6 +103,7 @@ tty_list::connect (int ttynum)
   if (!ttys[ttynum].exists ())
     {
       termios_printf ("tty %d was not allocated", ttynum);
+      set_errno (ENXIO);
       return -1;
     }