LINUX_OPOST
t->c_oflag &= ~LINUX_OPOST;
bts->c_oflag |= cvtto_bsd_mask(lt->c_oflag, LINUX_OPOST, OPOST);
lt->c_oflag |= cvtto_linux_mask(bts->c_oflag, OPOST, LINUX_OPOST);
bts->c_oflag |= cvtto_bsd_mask(lts->c_oflag, LINUX_OPOST, OPOST);
lts->c_oflag |= cvtto_linux_mask(bts->c_oflag, OPOST, LINUX_OPOST);