ST_EOT_PENDING
un->un_pos.eof = ST_EOT_PENDING;
un->un_pos.eof = ST_EOT_PENDING;
case ST_EOT_PENDING:
if (un->un_pos.eof == ST_EOT_PENDING) {
if (un->un_pos.eof == ST_EOT_PENDING) {
if (un->un_pos.eof == ST_EOT_PENDING) {
if (un->un_pos.eof < ST_EOT_PENDING &&