Documentation/linux_tv/media/dvb/FE_GET_FRONTEND.rst

   1 .. -*- coding: utf-8; mode: rst -*-
   2
   3 .. _FE_GET_FRONTEND:
   4
   5 ***************
   6 FE_GET_FRONTEND
   7 ***************
   8
   9 Description
  10 -----------
  11
  12 This ioctl call queries the currently effective frontend parameters. For
  13 this command, read-only access to the device is sufficient.
  14
  15 Synopsis
  16 --------
  17
  18 .. c:function:: int ioctl(int fd, int request = FE_GET_FRONTEND, struct dvb_frontend_parameters *p)
  19
  20 Arguments
  21 ----------
  22
  23
  24
  25 .. flat-table::
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  28
  29
  30     -  .. row 1
  31
  32        -  int fd
  33
  34        -  File descriptor returned by a previous call to open().
  35
  36     -  .. row 2
  37
  38        -  int request
  39
  40        -  Equals :ref:`FE_SET_FRONTEND` for this
  41           command.
  42
  43     -  .. row 3
  44
  45        -  struct dvb_frontend_parameters \*p
  46
  47        -  Points to parameters for tuning operation.
  48
  49
  50 Return Value
  51 ------------
  52
  53 On success 0 is returned, on error -1 and the ``errno`` variable is set
  54 appropriately. The generic error codes are described at the
  55 :ref:`Generic Error Codes <gen-errors>` chapter.
  56
  57
  58
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  63
  64     -  .. row 1
  65
  66        -  ``EINVAL``
  67
  68        -  Maximum supported symbol rate reached.