H5S_GET_REGULAR_HYPERSLAB takes the dataspace identifier,
space_id, and retrieves the values of
block for the regular hyperslab selection.
A regular hyperslab selection is a hyperslab selection described by setting the
block parameters to the H5S_SELECT_HYPERSLAB call. If several calls to H5S_SELECT_HYPERSLAB are needed, the hyperslab selection is irregular.
See H5S_SELECT_HYPERSLAB for descriptions of
Note: If a hyperslab selection is originally regular, then becomes irregular through selection operations, and then becomes regular again, the final regular selection may be equivalent but not identical to the original regular selection.