vgroup_id	IN:	Vgroup identifier returned by Vattach
	attr_index	IN:	Index of the attribute
	attr_values	OUT:	Buffer for the attribute values

	Purpose	Retrieves the values of a vgroup attribute.
	Return value	Returns SUCCEED (or 0) if successful and FAIL (or -1) otherwise.
	Description	Vgetattr retrieves the values of the attribute identified by its index, attr_index, into the buffer attr_values for the vgroup identified by the parameter vgroup_id.
		The valid values of the parameter attr_index range from 0 to the total number of vgroup attributes - 1. The total number of attributes can be obtained using Vnattrs. To determine the amount of memory sufficient to hold the attribute values, the user can obtain the number of attribute values and the attribute value size using Vattrinfo.

	FORTRAN	integer function vfgnatt(vgroup_id, attr_index, attr_values)
		integer vgroup_id, attr_index
		<valid numeric data type> attr_values
		integer function vfgcatt(vgroup_id, attr_index, attr_values)
		integer vgroup_id, attr_index
		character*(*) attr_values