OSSIOC_IN
if ((cmd & (OSSIOC_IN | OSSIOC_OUT)) && sz) {
if (cmd & OSSIOC_IN) {
if ((cmd & (OSSIOC_IN | OSSIOC_OUT)) && sz) {
if (cmd & OSSIOC_IN) {
#define OSSIOC_INOUT (OSSIOC_IN|OSSIOC_OUT)
#define __OSSIOW(x, y, t) ((int)(OSSIOC_IN|OSSIOC_SZ(t)|(x<<8)|y))