MDB_IOB_PGENABLE
mdb_iob_setflags(mdb.m_out, MDB_IOB_PGENABLE);
if (iob->iob_flags & MDB_IOB_PGENABLE)
iob->iob_flags |= MDB_IOB_PGENABLE;
oflag = mdb_iob_getflags(mdb.m_out) & MDB_IOB_PGENABLE;
mdb_iob_setflags(mdb.m_out, MDB_IOB_PGENABLE);
mdb_iob_clrflags(mdb.m_out, MDB_IOB_PGENABLE);
uint_t oflag = mdb_iob_getflags(mdb.m_out) & MDB_IOB_PGENABLE;
mdb_iob_setflags(mdb.m_out, MDB_IOB_PGENABLE);
mdb_iob_clrflags(mdb.m_out, MDB_IOB_PGENABLE);