2.6.2.3. FE_READ_SIGNAL_STRENGTH¶
2.6.2.3.2. Synopsis¶
-
int
ioctl
(int fd, FE_READ_SIGNAL_STRENGTH, uint16_t *strength)¶
2.6.2.3.3. Arguments¶
fd
- File descriptor returned by
open()
. 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.