1 .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later 2 .. c:namespace:: DTV.fe 3 4 .. _FE_GET_PROPERTY: 5 6 ************************************** 7 ioctl FE_SET_PROPERTY, FE_GET_PROPERTY 8 ************************************** 9 10 Name 11 ==== 12 13 FE_SET_PROPERTY - FE_GET_PROPERTY - FE_SET_PROPERTY sets one or more frontend properties. - FE_GET_PROPERTY returns one or more frontend properties. 14 15 Synopsis 16 ======== 17 18 .. c:macro:: FE_GET_PROPERTY 19 20 ``int ioctl(int fd, FE_GET_PROPERTY, struct dtv_properties *argp)`` 21 22 .. c:macro:: FE_SET_PROPERTY 23 24 ``int ioctl(int fd, FE_SET_PROPERTY, struct dtv_properties *argp)`` 25 26 Arguments 27 ========= 28 29 ``fd`` 30 File descriptor returned by :c:func:`open()`. 31 32 ``argp`` 33 Pointer to struct :c:type:`dtv_properties`. 34 35 Description 36 =========== 37 38 All Digital TV frontend devices support the ``FE_SET_PROPERTY`` and 39 ``FE_GET_PROPERTY`` ioctls. The supported properties and statistics 40 depends on the delivery system and on the device: 41 42 - ``FE_SET_PROPERTY:`` 43 44 - This ioctl is used to set one or more frontend properties. 45 46 - This is the basic command to request the frontend to tune into 47 some frequency and to start decoding the digital TV signal. 48 49 - This call requires read/write access to the device. 50 51 .. note:: 52 53 At return, the values aren't updated to reflect the actual 54 parameters used. If the actual parameters are needed, an explicit 55 call to ``FE_GET_PROPERTY`` is needed. 56 57 - ``FE_GET_PROPERTY:`` 58 59 - This ioctl is used to get properties and statistics from the 60 frontend. 61 62 - No properties are changed, and statistics aren't reset. 63 64 - This call only requires read-only access to the device. 65 66 Return Value 67 ============ 68 69 On success 0 is returned. 70 71 On error -1 is returned, and the ``errno`` variable is set 72 appropriately. 73 74 Generic error codes are described at the 75 :ref:`Generic Error Codes <gen-errors>` chapter.
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