0001 .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
0002 .. c:namespace:: DTV.video
0003
0004 .. _video_fopen:
0005
0006 ================
0007 dvb video open()
0008 ================
0009
0010 Name
0011 ----
0012
0013 dvb video open()
0014
0015 .. attention:: This ioctl is deprecated.
0016
0017 Synopsis
0018 --------
0019
0020 .. c:function:: int open(const char *deviceName, int flags)
0021
0022 Arguments
0023 ---------
0024
0025 .. flat-table::
0026 :header-rows: 0
0027 :stub-columns: 0
0028
0029 - .. row 1
0030
0031 - const char \*deviceName
0032
0033 - Name of specific video device.
0034
0035 - .. row 2
0036
0037 - int flags
0038
0039 - A bit-wise OR of the following flags:
0040
0041 - .. row 3
0042
0043 -
0044 - O_RDONLY read-only access
0045
0046 - .. row 4
0047
0048 -
0049 - O_RDWR read/write access
0050
0051 - .. row 5
0052
0053 -
0054 - O_NONBLOCK open in non-blocking mode
0055
0056 - .. row 6
0057
0058 -
0059 - (blocking mode is the default)
0060
0061 Description
0062 -----------
0063
0064 This system call opens a named video device (e.g.
0065 /dev/dvb/adapter0/video0) for subsequent use.
0066
0067 When an open() call has succeeded, the device will be ready for use. The
0068 significance of blocking or non-blocking mode is described in the
0069 documentation for functions where there is a difference. It does not
0070 affect the semantics of the open() call itself. A device opened in
0071 blocking mode can later be put into non-blocking mode (and vice versa)
0072 using the F_SETFL command of the fcntl system call. This is a standard
0073 system call, documented in the Linux manual page for fcntl. Only one
0074 user can open the Video Device in O_RDWR mode. All other attempts to
0075 open the device in this mode will fail, and an error-code will be
0076 returned. If the Video Device is opened in O_RDONLY mode, the only
0077 ioctl call that can be used is VIDEO_GET_STATUS. All other call will
0078 return an error code.
0079
0080 Return Value
0081 ------------
0082
0083 .. tabularcolumns:: |p{2.5cm}|p{15.0cm}|
0084
0085 .. flat-table::
0086 :header-rows: 0
0087 :stub-columns: 0
0088
0089 - .. row 1
0090
0091 - ``ENODEV``
0092
0093 - Device driver not loaded/available.
0094
0095 - .. row 2
0096
0097 - ``EINTERNAL``
0098
0099 - Internal error.
0100
0101 - .. row 3
0102
0103 - ``EBUSY``
0104
0105 - Device or resource busy.
0106
0107 - .. row 4
0108
0109 - ``EINVAL``
0110
0111 - Invalid argument.
