ioppt
static int iop_passthrough(struct iop_softc *, struct ioppt *,
rv = iop_passthrough(sc, (struct ioppt *)data, l->l_proc);
iop_passthrough(struct iop_softc *sc, struct ioppt *pt, struct proc *p)
#define IOPIOCPT _IOWR('u', 0, struct ioppt)
struct ioppt pt;