2.6.2.2. FE_READ_SNR¶
2.6.2.2.1. Name¶
FE_READ_SNR
2.6.2.2.3. Arguments¶
int fd | File descriptor returned by a previous call to open(). |
int request | Equals FE_READ_SNR for this command. |
uint16_t *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.