2.6.2.2. FE_READ_SNR¶
2.6.2.2.2. Synopsis¶
-
int
ioctl(int fd, FE_READ_SNR, int16_t *snr)¶
2.6.2.2.3. Arguments¶
fd- File descriptor returned by
open(). snr- The signal-to-noise ratio is stored into *snr.
2.6.2.2.4. Description¶
This ioctl call returns the signal-to-noise ratio for the signal currently received by the front-end. For this command, read-only access to the device is sufficient.
2.6.2.2.5. Return Value¶
On success 0 is returned, on error -1 and the errno variable is set
appropriately. The generic error codes are described at the
Generic Error Codes chapter.