status.i4.v = sr_set_source_c(data_source.i4.v)

	This routine sets the data source for save/restore data accessed
	by the sr_get_device_c and sr_get_device_raw_c routines.

	data_source	source of data
			(SRMNGR_NORMAL -> normal save/restore files (default),
			 SRMNGR_SDA_DATA -> SDA data,
			 SRMNGR_SNAP_DATA -> detached snapshot manager data)

	This function returns ACNET status values as follows:

	OK			success
	DIO_BADARG		invalid data source
	DIO_UNAVAIL		timed out waiting for reader process
	otherwise		ACNET error

	This function requires the following include files:

	cbslib_h, acnet_errors_h

	Related functions:

	sr_disconnect, sr_get_device_c, sr_get_device_raw_c,
	sr_data_length_c, sr_sda_data_lengths_c,  sr_is_on_c,
	sr_is_positive_c, sr_status_text_c, sr_file_menu_c,
	sr_directory_info_c, sr_sda_cases_present_c, sr_sda_num_subcases_c,
	sr_sda_subcases_present_c, sr_sda_case_times_c

	C/C++ usage:

	int	status;
	int	data_source = SRMNGR_NORMAL;

	status = sr_set_source_c(data_source);