TSTATIOC_READ
if (ioctl(g_fd, TSTATIOC_READ, g_data[g_gen ^ 1]) == -1)
if (ioctl(g_fd, TSTATIOC_READ, g_data[g_gen]) == -1)
if (ioctl(g_fd, TSTATIOC_READ, g_data[g_gen]) == -1)
case TSTATIOC_READ: