18c2ecf20Sopenharmony_ci.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later 28c2ecf20Sopenharmony_ci.. c:namespace:: DTV.fe 38c2ecf20Sopenharmony_ci 48c2ecf20Sopenharmony_ci.. _FE_GET_FRONTEND: 58c2ecf20Sopenharmony_ci 68c2ecf20Sopenharmony_ci*************** 78c2ecf20Sopenharmony_ciFE_GET_FRONTEND 88c2ecf20Sopenharmony_ci*************** 98c2ecf20Sopenharmony_ci 108c2ecf20Sopenharmony_ciName 118c2ecf20Sopenharmony_ci==== 128c2ecf20Sopenharmony_ci 138c2ecf20Sopenharmony_ciFE_GET_FRONTEND 148c2ecf20Sopenharmony_ci 158c2ecf20Sopenharmony_ci.. attention:: This ioctl is deprecated. 168c2ecf20Sopenharmony_ci 178c2ecf20Sopenharmony_ciSynopsis 188c2ecf20Sopenharmony_ci======== 198c2ecf20Sopenharmony_ci 208c2ecf20Sopenharmony_ci.. c:macro:: FE_GET_FRONTEND 218c2ecf20Sopenharmony_ci 228c2ecf20Sopenharmony_ci``int ioctl(int fd, FE_GET_FRONTEND, struct dvb_frontend_parameters *p)`` 238c2ecf20Sopenharmony_ci 248c2ecf20Sopenharmony_ciArguments 258c2ecf20Sopenharmony_ci========= 268c2ecf20Sopenharmony_ci 278c2ecf20Sopenharmony_ci``fd`` 288c2ecf20Sopenharmony_ci File descriptor returned by :c:func:`open()`. 298c2ecf20Sopenharmony_ci 308c2ecf20Sopenharmony_ci``p`` 318c2ecf20Sopenharmony_ci Points to parameters for tuning operation. 328c2ecf20Sopenharmony_ci 338c2ecf20Sopenharmony_ciDescription 348c2ecf20Sopenharmony_ci=========== 358c2ecf20Sopenharmony_ci 368c2ecf20Sopenharmony_ciThis ioctl call queries the currently effective frontend parameters. For 378c2ecf20Sopenharmony_cithis command, read-only access to the device is sufficient. 388c2ecf20Sopenharmony_ci 398c2ecf20Sopenharmony_ciReturn Value 408c2ecf20Sopenharmony_ci============ 418c2ecf20Sopenharmony_ci 428c2ecf20Sopenharmony_ciOn success 0 is returned. 438c2ecf20Sopenharmony_ci 448c2ecf20Sopenharmony_ciOn error -1 is returned, and the ``errno`` variable is set 458c2ecf20Sopenharmony_ciappropriately. 468c2ecf20Sopenharmony_ci 478c2ecf20Sopenharmony_ci.. flat-table:: 488c2ecf20Sopenharmony_ci :header-rows: 0 498c2ecf20Sopenharmony_ci :stub-columns: 0 508c2ecf20Sopenharmony_ci 518c2ecf20Sopenharmony_ci - .. row 1 528c2ecf20Sopenharmony_ci 538c2ecf20Sopenharmony_ci - ``EINVAL`` 548c2ecf20Sopenharmony_ci 558c2ecf20Sopenharmony_ci - Maximum supported symbol rate reached. 568c2ecf20Sopenharmony_ci 578c2ecf20Sopenharmony_ciGeneric error codes are described at the 588c2ecf20Sopenharmony_ci:ref:`Generic Error Codes <gen-errors>` chapter. 59