OSSIOC_OUT
if ((cmd & (OSSIOC_IN | OSSIOC_OUT)) && sz) {
if ((rv == 0) && (cmd & OSSIOC_OUT)) {
if ((cmd & (OSSIOC_IN | OSSIOC_OUT)) && sz) {
if ((rv == 0) && (cmd & OSSIOC_OUT)) {
#define OSSIOC_INOUT (OSSIOC_IN|OSSIOC_OUT)
#define __OSSIOR(x, y, t) ((int)(OSSIOC_OUT|OSSIOC_SZ(t)|(x<<8)|y))