2.6.2.3. FE_READ_SIGNAL_STRENGTH¶
2.6.2.3.1. Name¶
FE_READ_SIGNAL_STRENGTH
2.6.2.3.3. Arguments¶
int fd | File descriptor returned by a previous call to open(). |
int request | Equals FE_READ_SIGNAL_STRENGTH for this command. |
uint16_t *strength | The signal strength value is stored into *strength. |
2.6.2.3.4. Description¶
This ioctl call returns the signal strength value for the signal currently received by the front-end. For this command, read-only access to the device is sufficient.
2.6.2.3.5. 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.