115 lines
2.0 KiB
ReStructuredText
115 lines
2.0 KiB
ReStructuredText
.. -*- coding: utf-8; mode: rst -*-
|
|
|
|
.. _video_fopen:
|
|
|
|
================
|
|
dvb video open()
|
|
================
|
|
|
|
Name
|
|
----
|
|
|
|
dvb video open()
|
|
|
|
|
|
Synopsis
|
|
--------
|
|
|
|
.. cpp:function:: int open(const char *deviceName, int flags)
|
|
|
|
|
|
Arguments
|
|
---------
|
|
|
|
.. flat-table::
|
|
:header-rows: 0
|
|
:stub-columns: 0
|
|
|
|
|
|
- .. row 1
|
|
|
|
- const char \*deviceName
|
|
|
|
- Name of specific video device.
|
|
|
|
- .. row 2
|
|
|
|
- int flags
|
|
|
|
- A bit-wise OR of the following flags:
|
|
|
|
- .. row 3
|
|
|
|
-
|
|
- O_RDONLY read-only access
|
|
|
|
- .. row 4
|
|
|
|
-
|
|
- O_RDWR read/write access
|
|
|
|
- .. row 5
|
|
|
|
-
|
|
- O_NONBLOCK open in non-blocking mode
|
|
|
|
- .. row 6
|
|
|
|
-
|
|
- (blocking mode is the default)
|
|
|
|
|
|
Description
|
|
-----------
|
|
|
|
This system call opens a named video device (e.g.
|
|
/dev/dvb/adapter0/video0) for subsequent use.
|
|
|
|
When an open() call has succeeded, the device will be ready for use. The
|
|
significance of blocking or non-blocking mode is described in the
|
|
documentation for functions where there is a difference. It does not
|
|
affect the semantics of the open() call itself. A device opened in
|
|
blocking mode can later be put into non-blocking mode (and vice versa)
|
|
using the F_SETFL command of the fcntl system call. This is a standard
|
|
system call, documented in the Linux manual page for fcntl. Only one
|
|
user can open the Video Device in O_RDWR mode. All other attempts to
|
|
open the device in this mode will fail, and an error-code will be
|
|
returned. If the Video Device is opened in O_RDONLY mode, the only
|
|
ioctl call that can be used is VIDEO_GET_STATUS. All other call will
|
|
return an error code.
|
|
|
|
|
|
Return Value
|
|
------------
|
|
|
|
.. tabularcolumns:: |p{2.5cm}|p{15.0cm}|
|
|
|
|
.. flat-table::
|
|
:header-rows: 0
|
|
:stub-columns: 0
|
|
|
|
|
|
- .. row 1
|
|
|
|
- ``ENODEV``
|
|
|
|
- Device driver not loaded/available.
|
|
|
|
- .. row 2
|
|
|
|
- ``EINTERNAL``
|
|
|
|
- Internal error.
|
|
|
|
- .. row 3
|
|
|
|
- ``EBUSY``
|
|
|
|
- Device or resource busy.
|
|
|
|
- .. row 4
|
|
|
|
- ``EINVAL``
|
|
|
|
- Invalid argument.
|