1.. -*- coding: utf-8; mode: rst -*- 2 3.. _FE_GET_PROPERTY: 4 5************************************** 6ioctl FE_SET_PROPERTY, FE_GET_PROPERTY 7************************************** 8 9Name 10==== 11 12FE_SET_PROPERTY - FE_GET_PROPERTY - FE_SET_PROPERTY sets one or more frontend properties. - FE_GET_PROPERTY returns one or more frontend properties. 13 14 15Synopsis 16======== 17 18.. c:function:: int ioctl( int fd, FE_GET_PROPERTY, struct dtv_properties *argp ) 19 :name: FE_GET_PROPERTY 20 21.. c:function:: int ioctl( int fd, FE_SET_PROPERTY, struct dtv_properties *argp ) 22 :name: FE_SET_PROPERTY 23 24 25Arguments 26========= 27 28``fd`` 29 File descriptor returned by :ref:`open() <frontend_f_open>`. 30 31``argp`` 32 Pointer to struct :c:type:`dtv_properties`. 33 34 35Description 36=========== 37 38All Digital TV frontend devices support the ``FE_SET_PROPERTY`` and 39``FE_GET_PROPERTY`` ioctls. The supported properties and statistics 40depends 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 - At return, the values are updated to reflect the actual parameters 52 used. 53 54- ``FE_GET_PROPERTY:`` 55 56 - This ioctl is used to get properties and statistics from the 57 frontend. 58 59 - No properties are changed, and statistics aren't reset. 60 61 - This call only requires read-only access to the device. 62 63 64Return Value 65============ 66 67On success 0 is returned. 68 69On error -1 is returned, and the ``errno`` variable is set 70appropriately. 71 72Generic error codes are described at the 73:ref:`Generic Error Codes <gen-errors>` chapter. 74