Index: fhandler_tty.cc
===================================================================
RCS file: /cvs/src/src/winsup/cygwin/fhandler_tty.cc,v
retrieving revision 1.113
diff -u -p -r1.113 fhandler_tty.cc
--- fhandler_tty.cc	22 Oct 2003 10:07:58 -0000	1.113
+++ fhandler_tty.cc	23 Oct 2003 21:56:45 -0000
@@ -1033,6 +1033,7 @@ fhandler_tty_slave::ioctl (unsigned int 
       break;
     case FIONBIO:
       set_nonblocking (*(int *) arg);
+      get_ttyp ()->ioctl_retval = 0;
       goto out;
     default:
       set_errno (EINVAL);