Based on kernel version 6.8
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 | .. 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 <gen-errors>` chapter. |