1.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later 2 3.. _FE_GET_INFO: 4 5***************** 6ioctl FE_GET_INFO 7***************** 8 9Name 10==== 11 12FE_GET_INFO - Query Digital TV frontend capabilities and returns information 13about the - front-end. This call only requires read-only access to the device. 14 15 16Synopsis 17======== 18 19.. c:function:: int ioctl( int fd, FE_GET_INFO, struct dvb_frontend_info *argp ) 20 :name: FE_GET_INFO 21 22 23Arguments 24========= 25 26``fd`` 27 File descriptor returned by :ref:`open() <frontend_f_open>`. 28 29``argp`` 30 pointer to struct :c:type:`dvb_frontend_info` 31 32 33Description 34=========== 35 36All Digital TV frontend devices support the :ref:`FE_GET_INFO` ioctl. It is 37used to identify kernel devices compatible with this specification and to 38obtain information about driver and hardware capabilities. The ioctl 39takes a pointer to dvb_frontend_info which is filled by the driver. 40When the driver is not compatible with this specification the ioctl 41returns an error. 42 43 44frontend capabilities 45===================== 46 47Capabilities describe what a frontend can do. Some capabilities are 48supported only on some specific frontend types. 49 50The frontend capabilities are described at :c:type:`fe_caps`. 51 52 53Return Value 54============ 55 56On success 0 is returned. 57 58On error -1 is returned, and the ``errno`` variable is set 59appropriately. 60 61Generic error codes are described at the 62:ref:`Generic Error Codes <gen-errors>` chapter. 63