aboutsummaryrefslogtreecommitdiff
path: root/Documentation/media/uapi/dvb/audio-fwrite.rst
blob: 4980ae7953ef382b3721f142c4b677ba1f1a83d9 (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
.. -*- coding: utf-8; mode: rst -*-

.. _audio_fwrite:

=========================
Digital TV audio write()
=========================

Name
----

Digital TV audio write()

.. attention:: This ioctl is deprecated

Synopsis
--------

.. c:function:: size_t write(int fd, const void *buf, size_t count)
    :name: dvb-audio-write


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 PES data.

    -  .. row 3

       -  size_t count

       -  Size of buf.


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

This system call can only be used if AUDIO_SOURCE_MEMORY is selected
in the ioctl call AUDIO_SELECT_SOURCE. The data provided shall be in
PES format. If O_NONBLOCK is not specified the function will block
until buffer space is available. The amount of data to be transferred is
implied by count.


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

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


    -  .. row 1

       -  ``EPERM``

       -  Mode AUDIO_SOURCE_MEMORY not selected.

    -  .. row 2

       -  ``ENOMEM``

       -  Attempted to write more data than the internal buffer can hold.

    -  .. row 3

       -  ``EBADF``

       -  fd is not a valid open file descriptor.