Documentation/media/uapi/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 Name
  10 ====
  11
  12 FE_GET_FRONTEND
  13
  14
  15 Synopsis
  16 ========
  17
  18 .. cpp:function:: int ioctl(int fd, int request = FE_GET_FRONTEND, struct dvb_frontend_parameters *p)
  19
  20
  21 Arguments
  22 =========
  23
  24 .. flat-table::
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  27
  28
  29     -  .. row 1
  30
  31        -  int fd
  32
  33        -  File descriptor returned by a previous call to open().
  34
  35     -  .. row 2
  36
  37        -  int request
  38
  39        -  Equals :ref:`FE_SET_FRONTEND` for this
  40           command.
  41
  42     -  .. row 3
  43
  44        -  struct dvb_frontend_parameters \*p
  45
  46        -  Points to parameters for tuning operation.
  47
  48
  49 Description
  50 ===========
  51
  52 This ioctl call queries the currently effective frontend parameters. For
  53 this command, read-only access to the device is sufficient.
  54
  55
  56 Return Value
  57 ============
  58
  59 On success 0 is returned, on error -1 and the ``errno`` variable is set
  60 appropriately. The generic error codes are described at the
  61 :ref:`Generic Error Codes <gen-errors>` chapter.
  62
  63
  64
  65 .. flat-table::
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  68
  69
  70     -  .. row 1
  71
  72        -  ``EINVAL``
  73
  74        -  Maximum supported symbol rate reached.