This ioctl is deprecated.
int ioctl(int fd, FE_READ_SIGNAL_STRENGTH, uint16_t *strength)
File descriptor returned by
The signal strength value is stored into *strength.
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.
220.127.116.11.5. Return Value¶
On success 0 is returned.
On error -1 is returned, and the
errno variable is set
Generic error codes are described at the Generic Error Codes chapter.