status.i4.v = node_guaranteed_readable_device_c(node.i4.v,

	This routine will return the guaranteed readable device for
	an ACNET node.  Reading this device should indicate whether
	or not the node is functioning.

	node		ACNET node (constants are in 'nodedefs')
	device_index	returned device index for the guaranteed readable device
			(A value of 0 will be returned if there is no
			 guaranteed readable device.)

	This function returns ACNET status values as follows:

	OK			success
	CLIB_INVARG		invalid node requested
	CLIB_NO_SUCH		requested node not found
	SQL_xxxx		database access failure

	This function requires the following include files:

	cbslib_h, nodedefs_h, acnet_errors_h

	Related functions:

	node_reboot_device_c, acnet_node_ext_info_c, acnet_node_info_c,
	acnet_node_ip_address_c, acnet_node_type_c, ip_address_to_acnet_node,
	ip_address_to_matching_acnet_node, ip_address_to_node, node_info_db,
	front_end_type_c, is_front_end_node_c, node_is_up_c, node_acnet_ping_c,
	node_has_after_boot_script_c, node_has_boot_message_c,
	node_has_boot_script_c, node_coresident_nodes_c

	C/C++ usage:

	int	status;
	int	node = MIVAC;
	int	device_index;

	status = node_guaranteed_readable_device_c(node,&device_index);