_align

 The _align modifier allows you to align objects of any of the VSI C
 data types on a specified storage boundary.  Use the _align
 modifier in a data declaration or definition.

 When specifying the boundary of the data alignment, you can use a
 predefined constant:  BYTE or byte, WORD or word, LONGWORD or
 longword, QUADWORD or quadword, OCTAWORD or octaword, and PAGE or
 page.

 You can also specify an integer value that is a power of two.  The
 power of two tells VSI C the number of bytes to pad in order to
 align the data:

   For OpenVMS VAX systems, specify a constant 0, 1, 2, 3, 4, or 9.

   For OpenVMS Alpha systems, specify any constant from 0 to 16.