6.1.2.3. FE_READ_SIGNAL_STRENGTH¶
6.1.2.3.2. Synopsis¶
-
int
ioctl(int fd, FE_READ_SIGNAL_STRENGTH, uint16_t *strength)¶
6.1.2.3.3. Arguments¶
fd- File descriptor returned by
open(). strength- The signal strength value is stored into *strength.
6.1.2.3.4. 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.
6.1.2.3.5. Return Value¶
On success 0 is returned.
On error -1 is returned, and the errno variable is set
appropriately.
Generic error codes are described at the Generic Error Codes chapter.