Tvheadend

static int check_frontend (int fe_fd, int dvr, int human_readable) {

  (void)dvr;

  fe_status_t status;

  uint16_t snr, signal;

  uint32_t ber;

  int timeout = 0;

  do {

    if (ioctl(fe_fd, FE_READ_STATUS, &status) == -1)

      perror("FE_READ_STATUS failed");

    /* some frontends might not support all these ioctls, thus we

     * avoid printing errors

     */

    if (ioctl(fe_fd, FE_READ_SIGNAL_STRENGTH, &signal) == -1)

      signal = -2;

    if (ioctl(fe_fd, FE_READ_SNR, &snr) == -1)

      snr = -2;

    if (ioctl(fe_fd, FE_READ_BER, &ber) == -1)

      ber = -2;

    if ((status & FE_HAS_LOCK) || (++timeout >= 10))

      break;

    usleep(1000000);

  } while (1);

  return 0;

}

  if(1)

    check_frontend (tda->tda_fe_fd, 0, 1);