{
{    The purpose of this request is to return the SDT, SDTX, and locked
{ FDE entry for the segment number specified.
{
{   MMP$FETCH_SDT_SDTX_LOCKED_FDE (segment_number, sdt_entry_p, sdtx_entry_p,
{          fde_entry_p, status)
{
{ SEGMENT_NUMBER: (input) This parameter is the segment number for which the
{            SDT, SDTX, and FDE entries are to be returned.
{
{ SDT_ENTRY_P: (output) This parameter is the pointer to the SDT entry for the
{            segment number specified.
{ SDTX_ENTRY_P: (output) This parameter is the pointer to the SDTX entry for the
{            segment number specified.
{
{ FDE_ENTRY_P: (output) This parameter is the pointer to the locked FDE entry for the
{            segment number specified. The requestor is responsible for unlocking
{            the FDE entry.
{
{ STATUS: (output) This parameter is the request status.
{
