.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later .. c:namespace:: DTV.fe .. _FE_READ_SIGNAL_STRENGTH: *********************** FE_READ_SIGNAL_STRENGTH *********************** Name ==== FE_READ_SIGNAL_STRENGTH .. attention:: This ioctl is deprecated. Synopsis ======== .. c:macro:: FE_READ_SIGNAL_STRENGTH ``int ioctl(int fd, FE_READ_SIGNAL_STRENGTH, uint16_t *strength)`` Arguments ========= ``fd`` File descriptor returned by :c:func:`open()`. ``strength`` The signal strength value is stored into \*strength. 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. 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.