0001 .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
0002 .. c:namespace:: DTV.fe
0003
0004 .. _FE_READ_SIGNAL_STRENGTH:
0005
0006 ***********************
0007 FE_READ_SIGNAL_STRENGTH
0008 ***********************
0009
0010 Name
0011 ====
0012
0013 FE_READ_SIGNAL_STRENGTH
0014
0015 .. attention:: This ioctl is deprecated.
0016
0017 Synopsis
0018 ========
0019
0020 .. c:macro:: FE_READ_SIGNAL_STRENGTH
0021
0022 ``int ioctl(int fd, FE_READ_SIGNAL_STRENGTH, uint16_t *strength)``
0023
0024 Arguments
0025 =========
0026
0027 ``fd``
0028 File descriptor returned by :c:func:`open()`.
0029
0030 ``strength``
0031 The signal strength value is stored into \*strength.
0032
0033 Description
0034 ===========
0035
0036 This ioctl call returns the signal strength value for the signal
0037 currently received by the front-end. For this command, read-only access
0038 to the device is sufficient.
0039
0040 Return Value
0041 ============
0042
0043 On success 0 is returned.
0044
0045 On error -1 is returned, and the ``errno`` variable is set
0046 appropriately.
0047
0048 Generic error codes are described at the
0049 :ref:`Generic Error Codes <gen-errors>` chapter.
