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.audio
3
4.. _audio_fopen:
5
6=======================
7Digital TV audio open()
8=======================
9
10Name
11----
12
13Digital TV audio 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 audio 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 audio device (e.g.
65/dev/dvb/adapter0/audio0) for subsequent use. When an open() call has
66succeeded, the device will be ready for use. The significance of
67blocking or non-blocking mode is described in the documentation for
68functions where there is a difference. It does not affect the semantics
69of the open() call itself. A device opened in blocking mode can later be
70put into non-blocking mode (and vice versa) using the F_SETFL command
71of the fcntl system call. This is a standard system call, documented in
72the Linux manual page for fcntl. Only one user can open the Audio Device
73in O_RDWR mode. All other attempts to open the device in this mode will
74fail, and an error code will be returned. If the Audio Device is opened
75in O_RDONLY mode, the only ioctl call that can be used is
76AUDIO_GET_STATUS. All other call will return with an error code.
77
78Return Value
79------------
80
81.. tabularcolumns:: |p{2.5cm}|p{15.0cm}|
82
83.. flat-table::
84 :header-rows: 0
85 :stub-columns: 0
86
87 - .. row 1
88
89 - ``ENODEV``
90
91 - Device driver not loaded/available.
92
93 - .. row 2
94
95 - ``EBUSY``
96
97 - Device or resource busy.
98
99 - .. row 3
100
101 - ``EINVAL``
102
103 - Invalid argument.