CUSE_IOCTL_READ_DATA
error = ioctl(f_cuse, CUSE_IOCTL_READ_DATA, &info);
case CUSE_IOCTL_READ_DATA:
pchk, cmd == CUSE_IOCTL_READ_DATA);
pcs, pccmd, pchk, cmd == CUSE_IOCTL_READ_DATA);