1 .. SPDX-License-Identifier: GFDL-1.1-no-invari 1 .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
2 .. c:namespace:: DTV.fe 2 .. c:namespace:: DTV.fe
3 3
4 .. _FE_READ_SIGNAL_STRENGTH: 4 .. _FE_READ_SIGNAL_STRENGTH:
5 5
6 *********************** 6 ***********************
7 FE_READ_SIGNAL_STRENGTH 7 FE_READ_SIGNAL_STRENGTH
8 *********************** 8 ***********************
9 9
10 Name 10 Name
11 ==== 11 ====
12 12
13 FE_READ_SIGNAL_STRENGTH 13 FE_READ_SIGNAL_STRENGTH
14 14
15 .. attention:: This ioctl is deprecated. 15 .. attention:: This ioctl is deprecated.
16 16
17 Synopsis 17 Synopsis
18 ======== 18 ========
19 19
20 .. c:macro:: FE_READ_SIGNAL_STRENGTH 20 .. c:macro:: FE_READ_SIGNAL_STRENGTH
21 21
22 ``int ioctl(int fd, FE_READ_SIGNAL_STRENGTH, u 22 ``int ioctl(int fd, FE_READ_SIGNAL_STRENGTH, uint16_t *strength)``
23 23
24 Arguments 24 Arguments
25 ========= 25 =========
26 26
27 ``fd`` 27 ``fd``
28 File descriptor returned by :c:func:`open( 28 File descriptor returned by :c:func:`open()`.
29 29
30 ``strength`` 30 ``strength``
31 The signal strength value is stored into \ 31 The signal strength value is stored into \*strength.
32 32
33 Description 33 Description
34 =========== 34 ===========
35 35
36 This ioctl call returns the signal strength va 36 This ioctl call returns the signal strength value for the signal
37 currently received by the front-end. For this 37 currently received by the front-end. For this command, read-only access
38 to the device is sufficient. 38 to the device is sufficient.
39 39
40 Return Value 40 Return Value
41 ============ 41 ============
42 42
43 On success 0 is returned. 43 On success 0 is returned.
44 44
45 On error -1 is returned, and the ``errno`` var 45 On error -1 is returned, and the ``errno`` variable is set
46 appropriately. 46 appropriately.
47 47
48 Generic error codes are described at the 48 Generic error codes are described at the
49 :ref:`Generic Error Codes <gen-errors>` chapte 49 :ref:`Generic Error Codes <gen-errors>` chapter.
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.