summaryrefslogtreecommitdiff
path: root/Documentation/media/uapi/dvb/dmx-fwrite.rst
blob: 9efd81a1b5c84793a356b006b124835d69306c60 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
.. -*- coding: utf-8; mode: rst -*-

.. _dmx_fwrite:

=================
DVB demux write()
=================

Name
----

DVB demux write()


Synopsis
--------

.. cpp:function:: ssize_t write(int fd, const void *buf, size_t count)


Arguments
---------

.. flat-table::
    :header-rows:  0
    :stub-columns: 0


    -  .. row 1

       -  int fd

       -  File descriptor returned by a previous call to open().

    -  .. row 2

       -  void \*buf

       -  Pointer to the buffer containing the Transport Stream.

    -  .. row 3

       -  size_t count

       -  Size of buf.


Description
-----------

This system call is only provided by the logical device
/dev/dvb/adapter0/dvr0, associated with the physical demux device that
provides the actual DVR functionality. It is used for replay of a
digitally recorded Transport Stream. Matching filters have to be defined
in the corresponding physical demux device, /dev/dvb/adapter0/demux0.
The amount of data to be transferred is implied by count.


Return Value
------------

.. flat-table::
    :header-rows:  0
    :stub-columns: 0


    -  .. row 1

       -  ``EWOULDBLOCK``

       -  No data was written. This might happen if O_NONBLOCK was
	  specified and there is no more buffer space available (if
	  O_NONBLOCK is not specified the function will block until buffer
	  space is available).

    -  .. row 2

       -  ``EBUSY``

       -  This error code indicates that there are conflicting requests. The
	  corresponding demux device is setup to receive data from the
	  front- end. Make sure that these filters are stopped and that the
	  filters with input set to DMX_IN_DVR are started.

    -  .. row 3

       -  ``EBADF``

       -  fd is not a valid open file descriptor.