MS_READ
if (ioctl(fDevice, MS_READ, &movements, sizeof(movements)) != B_OK) {
} else if (read.event == MS_READ) {
if (ioctl(fDevice, MS_READ, &movements, sizeof(movements)) != B_OK) {
_read->event = MS_READ;
} else if (read.event = MS_READ) {
_read->event = MS_READ;
case MS_READ:
case MS_READ:
case MS_READ: