Documentation/media/uapi/dvb/dmx-fwrite.rst

   1 .. -*- coding: utf-8; mode: rst -*-
   2
   3 .. _dmx_fwrite:
   4
   5 =================
   6 DVB demux write()
   7 =================
   8
   9 Name
  10 ----
  11
  12 DVB demux write()
  13
  14
  15 Synopsis
  16 --------
  17
  18 .. cpp:function:: ssize_t write(int fd, const void *buf, size_t count)
  19
  20
  21 Arguments
  22 ---------
  23
  24 .. flat-table::
  25     :header-rows:  0
  26     :stub-columns: 0
  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        -  void \*buf
  38
  39        -  Pointer to the buffer containing the Transport Stream.
  40
  41     -  .. row 3
  42
  43        -  size_t count
  44
  45        -  Size of buf.
  46
  47
  48 Description
  49 -----------
  50
  51 This system call is only provided by the logical device
  52 /dev/dvb/adapter0/dvr0, associated with the physical demux device that
  53 provides the actual DVR functionality. It is used for replay of a
  54 digitally recorded Transport Stream. Matching filters have to be defined
  55 in the corresponding physical demux device, /dev/dvb/adapter0/demux0.
  56 The amount of data to be transferred is implied by count.
  57
  58
  59 Return Value
  60 ------------
  61
  62 .. flat-table::
  63     :header-rows:  0
  64     :stub-columns: 0
  65
  66
  67     -  .. row 1
  68
  69        -  ``EWOULDBLOCK``
  70
  71        -  No data was written. This might happen if O_NONBLOCK was
  72           specified and there is no more buffer space available (if
  73           O_NONBLOCK is not specified the function will block until buffer
  74           space is available).
  75
  76     -  .. row 2
  77
  78        -  ``EBUSY``
  79
  80        -  This error code indicates that there are conflicting requests. The
  81           corresponding demux device is setup to receive data from the
  82           front- end. Make sure that these filters are stopped and that the
  83           filters with input set to DMX_IN_DVR are started.
  84
  85     -  .. row 3
  86
  87        -  ``EBADF``
  88
  89        -  fd is not a valid open file descriptor.