OFFTAB_MODE_WRITE
assert(offtab->ot_mode == OFFTAB_MODE_WRITE);
offtab->ot_mode = OFFTAB_MODE_WRITE;
offtab->ot_mode = OFFTAB_MODE_WRITE;
assert(offtab->ot_mode == OFFTAB_MODE_WRITE);
assert(offtab->ot_mode == OFFTAB_MODE_WRITE);
assert(offtab->ot_mode == OFFTAB_MODE_WRITE);