.. -*- coding: utf-8; mode: rst -*- .. _FE_READ_SNR: *********** FE_READ_SNR *********** Name ==== FE_READ_SNR .. attention:: This ioctl is deprecated. Synopsis ======== .. c:function:: int ioctl(int fd, FE_READ_SNR, int16_t *snr) :name: FE_READ_SNR Arguments ========= ``fd`` File descriptor returned by :c:func:`open() `. ``snr`` The signal-to-noise ratio is stored into \*snr. 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. 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 :ref:`Generic Error Codes ` chapter.