1 .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later 2 .. c:namespace:: DTV.fe 3 4 .. _FE_READ_STATUS: 5 6 ******************** 7 ioctl FE_READ_STATUS 8 ******************** 9 10 Name 11 ==== 12 13 FE_READ_STATUS - Returns status information about the front-end. This call only requires - read-only access to the device 14 15 Synopsis 16 ======== 17 18 .. c:macro:: FE_READ_STATUS 19 20 ``int ioctl(int fd, FE_READ_STATUS, unsigned int *status)`` 21 22 Arguments 23 ========= 24 25 ``fd`` 26 File descriptor returned by :c:func:`open()`. 27 28 ``status`` 29 pointer to a bitmask integer filled with the values defined by enum 30 :c:type:`fe_status`. 31 32 Description 33 =========== 34 35 All Digital TV frontend devices support the ``FE_READ_STATUS`` ioctl. It is 36 used to check about the locking status of the frontend after being 37 tuned. The ioctl takes a pointer to an integer where the status will be 38 written. 39 40 .. note:: 41 42 The size of status is actually sizeof(enum fe_status), with 43 varies according with the architecture. This needs to be fixed in the 44 future. 45 46 int fe_status 47 ============= 48 49 The fe_status parameter is used to indicate the current state and/or 50 state changes of the frontend hardware. It is produced using the enum 51 :c:type:`fe_status` values on a bitmask 52 53 Return Value 54 ============ 55 56 On success 0 is returned. 57 58 On error -1 is returned, and the ``errno`` variable is set 59 appropriately. 60 61 Generic error codes are described at the 62 :ref:`Generic Error Codes <gen-errors>` chapter.
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