status.i4.v = wn_fill_mode(fill_mode.i4.r)

	status.i4.v = wn_fill_mode_c(fill_mode.i4.v)

	This routine sets the current closed object fill mode for
	the "wn_xxx" graphical routines.

	fill_mode	fill mode
			(WN_EMPTY -> empty objects (default),
			 WN_FILLED -> filled objects,
			 CLIB_DEFAULT_ARG -> simply return present fill mode)

	This function returns status values as follows:

	CBS_INVARG		invalid mode
	otherwise		previous fill mode

	This function requires the following include files:

	clib_h, cbslib_h, acnet_errors_h

	Related functions:

	wn_box(_c), wn_circle(_c), wn_polygon_c, wn_symbol(_c), wn_symbol_set,

	C/C++ usage:

	int	status;
	int	fill_mode = WN_EMPTY;

	status = wn_fill_mode_c(fill_mode);