.. Permission is granted to copy, distribute and/or modify this .. document under the terms of the GNU Free Documentation License, .. Version 1.1 or any later version published by the Free Software .. Foundation, with no Invariant Sections, no Front-Cover Texts .. and no Back-Cover Texts. A copy of the license is included at .. Documentation/userspace-api/media/fdl-appendix.rst. .. .. TODO: replace it to GFDL-1.1-or-later WITH no-invariant-sections .. _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.