tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
2.. c:namespace:: DTV.video
3
4.. _video_fopen:
5
6================
7dvb video open()
8================
9
10Name
11----
12
13dvb video open()
14
15.. attention:: This ioctl is deprecated.
16
17Synopsis
18--------
19
20.. c:function:: int open(const char *deviceName, int flags)
21
22Arguments
23---------
24
25.. flat-table::
26 :header-rows: 0
27 :stub-columns: 0
28
29 - .. row 1
30
31 - const char \*deviceName
32
33 - Name of specific video device.
34
35 - .. row 2
36
37 - int flags
38
39 - A bit-wise OR of the following flags:
40
41 - .. row 3
42
43 -
44 - O_RDONLY read-only access
45
46 - .. row 4
47
48 -
49 - O_RDWR read/write access
50
51 - .. row 5
52
53 -
54 - O_NONBLOCK open in non-blocking mode
55
56 - .. row 6
57
58 -
59 - (blocking mode is the default)
60
61Description
62-----------
63
64This system call opens a named video device (e.g.
65/dev/dvb/adapter0/video0) for subsequent use.
66
67When an open() call has succeeded, the device will be ready for use. The
68significance of blocking or non-blocking mode is described in the
69documentation for functions where there is a difference. It does not
70affect the semantics of the open() call itself. A device opened in
71blocking mode can later be put into non-blocking mode (and vice versa)
72using the F_SETFL command of the fcntl system call. This is a standard
73system call, documented in the Linux manual page for fcntl. Only one
74user can open the Video Device in O_RDWR mode. All other attempts to
75open the device in this mode will fail, and an error-code will be
76returned. If the Video Device is opened in O_RDONLY mode, the only
77ioctl call that can be used is VIDEO_GET_STATUS. All other call will
78return an error code.
79
80Return Value
81------------
82
83.. tabularcolumns:: |p{2.5cm}|p{15.0cm}|
84
85.. flat-table::
86 :header-rows: 0
87 :stub-columns: 0
88
89 - .. row 1
90
91 - ``ENODEV``
92
93 - Device driver not loaded/available.
94
95 - .. row 2
96
97 - ``EINTERNAL``
98
99 - Internal error.
100
101 - .. row 3
102
103 - ``EBUSY``
104
105 - Device or resource busy.
106
107 - .. row 4
108
109 - ``EINVAL``
110
111 - Invalid argument.