status.i4.v = c465_find_level_c(main_device.i1a.r, event.i4.v)

	This routine returns the interrupt level in a C465/6/7/8/0 module
	containing the selected TCLK event.

	main_device	name of base (no suffix) 465 device
	event		TCLK event (constants are in 'tclk_events')
			(do not specify EVENT_NULL or EVENT_NOOP)

	This function returns status values as follows:

	CBS_INVARG		invalid root name (no blanks) or event
	CBS_INVSIZ		invalid family size (database entry error)
	CBS_INVTYP		device is not a C465 module
	CBS_NO_SUCH		clock event or family device not found
	negative value		other ACNET error
	otherwise		interrupt level containing TCLK event

	This function requires the following include files:

	ul_cbsaux_h:auxlib_device_h, tclk_events_h, acnet_errors_h

	Related functions:

	c465_find_level_list_c, c465_get_table_c, c465_get_table_list_c,
	find_time_slot_c, find_time_slot_list_c, get_465_device,
	get_465_family, get_465_type, c465_ft_frequency_c,
	c465_ft_frequency_list_c, c465_trigger_level_c,
	c465_trigger_level_list_c, wg_scale_mdat_data_c,
	dio_get_terse_name_length, dio_set_terse_name_length_c

	C/C++ usage:

	static const char	main_device[DEVICE_TERSE_NAME_LEN+1] = "T:QF    ";
	int	status;

	status = c465_find_level_c(main_device,event);