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Diffstat (limited to 'Documentation/DocBook/v4l/vidioc-dqevent.xml')
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diff --git a/Documentation/DocBook/v4l/vidioc-dqevent.xml b/Documentation/DocBook/v4l/vidioc-dqevent.xml new file mode 100644 index 000000000000..4e0a7cc30812 --- /dev/null +++ b/Documentation/DocBook/v4l/vidioc-dqevent.xml | |||
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1 | <refentry id="vidioc-dqevent"> | ||
2 | <refmeta> | ||
3 | <refentrytitle>ioctl VIDIOC_DQEVENT</refentrytitle> | ||
4 | &manvol; | ||
5 | </refmeta> | ||
6 | |||
7 | <refnamediv> | ||
8 | <refname>VIDIOC_DQEVENT</refname> | ||
9 | <refpurpose>Dequeue event</refpurpose> | ||
10 | </refnamediv> | ||
11 | |||
12 | <refsynopsisdiv> | ||
13 | <funcsynopsis> | ||
14 | <funcprototype> | ||
15 | <funcdef>int <function>ioctl</function></funcdef> | ||
16 | <paramdef>int <parameter>fd</parameter></paramdef> | ||
17 | <paramdef>int <parameter>request</parameter></paramdef> | ||
18 | <paramdef>struct v4l2_event | ||
19 | *<parameter>argp</parameter></paramdef> | ||
20 | </funcprototype> | ||
21 | </funcsynopsis> | ||
22 | </refsynopsisdiv> | ||
23 | |||
24 | <refsect1> | ||
25 | <title>Arguments</title> | ||
26 | |||
27 | <variablelist> | ||
28 | <varlistentry> | ||
29 | <term><parameter>fd</parameter></term> | ||
30 | <listitem> | ||
31 | <para>&fd;</para> | ||
32 | </listitem> | ||
33 | </varlistentry> | ||
34 | <varlistentry> | ||
35 | <term><parameter>request</parameter></term> | ||
36 | <listitem> | ||
37 | <para>VIDIOC_DQEVENT</para> | ||
38 | </listitem> | ||
39 | </varlistentry> | ||
40 | <varlistentry> | ||
41 | <term><parameter>argp</parameter></term> | ||
42 | <listitem> | ||
43 | <para></para> | ||
44 | </listitem> | ||
45 | </varlistentry> | ||
46 | </variablelist> | ||
47 | </refsect1> | ||
48 | |||
49 | <refsect1> | ||
50 | <title>Description</title> | ||
51 | |||
52 | <para>Dequeue an event from a video device. No input is required | ||
53 | for this ioctl. All the fields of the &v4l2-event; structure are | ||
54 | filled by the driver. The file handle will also receive exceptions | ||
55 | which the application may get by e.g. using the select system | ||
56 | call.</para> | ||
57 | |||
58 | <table frame="none" pgwide="1" id="v4l2-event"> | ||
59 | <title>struct <structname>v4l2_event</structname></title> | ||
60 | <tgroup cols="4"> | ||
61 | &cs-str; | ||
62 | <tbody valign="top"> | ||
63 | <row> | ||
64 | <entry>__u32</entry> | ||
65 | <entry><structfield>type</structfield></entry> | ||
66 | <entry></entry> | ||
67 | <entry>Type of the event.</entry> | ||
68 | </row> | ||
69 | <row> | ||
70 | <entry>union</entry> | ||
71 | <entry><structfield>u</structfield></entry> | ||
72 | <entry></entry> | ||
73 | <entry></entry> | ||
74 | </row> | ||
75 | <row> | ||
76 | <entry></entry> | ||
77 | <entry>&v4l2-event-vsync;</entry> | ||
78 | <entry><structfield>vsync</structfield></entry> | ||
79 | <entry>Event data for event V4L2_EVENT_VSYNC. | ||
80 | </entry> | ||
81 | </row> | ||
82 | <row> | ||
83 | <entry></entry> | ||
84 | <entry>__u8</entry> | ||
85 | <entry><structfield>data</structfield>[64]</entry> | ||
86 | <entry>Event data. Defined by the event type. The union | ||
87 | should be used to define easily accessible type for | ||
88 | events.</entry> | ||
89 | </row> | ||
90 | <row> | ||
91 | <entry>__u32</entry> | ||
92 | <entry><structfield>pending</structfield></entry> | ||
93 | <entry></entry> | ||
94 | <entry>Number of pending events excluding this one.</entry> | ||
95 | </row> | ||
96 | <row> | ||
97 | <entry>__u32</entry> | ||
98 | <entry><structfield>sequence</structfield></entry> | ||
99 | <entry></entry> | ||
100 | <entry>Event sequence number. The sequence number is | ||
101 | incremented for every subscribed event that takes place. | ||
102 | If sequence numbers are not contiguous it means that | ||
103 | events have been lost. | ||
104 | </entry> | ||
105 | </row> | ||
106 | <row> | ||
107 | <entry>struct timespec</entry> | ||
108 | <entry><structfield>timestamp</structfield></entry> | ||
109 | <entry></entry> | ||
110 | <entry>Event timestamp.</entry> | ||
111 | </row> | ||
112 | <row> | ||
113 | <entry>__u32</entry> | ||
114 | <entry><structfield>reserved</structfield>[9]</entry> | ||
115 | <entry></entry> | ||
116 | <entry>Reserved for future extensions. Drivers must set | ||
117 | the array to zero.</entry> | ||
118 | </row> | ||
119 | </tbody> | ||
120 | </tgroup> | ||
121 | </table> | ||
122 | |||
123 | </refsect1> | ||
124 | </refentry> | ||
125 | <!-- | ||
126 | Local Variables: | ||
127 | mode: sgml | ||
128 | sgml-parent-document: "v4l2.sgml" | ||
129 | indent-tabs-mode: nil | ||
130 | End: | ||
131 | --> | ||