77 lines
1.7 KiB
ReStructuredText
77 lines
1.7 KiB
ReStructuredText
.. Permission is granted to copy, distribute and/or modify this
|
|
.. document under the terms of the GNU Free Documentation License,
|
|
.. Version 1.1 or any later version published by the Free Software
|
|
.. Foundation, with no Invariant Sections, no Front-Cover Texts
|
|
.. and no Back-Cover Texts. A copy of the license is included at
|
|
.. Documentation/media/uapi/fdl-appendix.rst.
|
|
..
|
|
.. TODO: replace it to GFDL-1.1-or-later WITH no-invariant-sections
|
|
|
|
.. _media-func-open:
|
|
|
|
************
|
|
media open()
|
|
************
|
|
|
|
Name
|
|
====
|
|
|
|
media-open - Open a media device
|
|
|
|
|
|
Synopsis
|
|
========
|
|
|
|
.. code-block:: c
|
|
|
|
#include <fcntl.h>
|
|
|
|
|
|
.. c:function:: int open( const char *device_name, int flags )
|
|
:name: mc-open
|
|
|
|
Arguments
|
|
=========
|
|
|
|
``device_name``
|
|
Device to be opened.
|
|
|
|
``flags``
|
|
Open flags. Access mode must be either ``O_RDONLY`` or ``O_RDWR``.
|
|
Other flags have no effect.
|
|
|
|
|
|
Description
|
|
===========
|
|
|
|
To open a media device applications call :ref:`open() <media-func-open>` with the
|
|
desired device name. The function has no side effects; the device
|
|
configuration remain unchanged.
|
|
|
|
When the device is opened in read-only mode, attempts to modify its
|
|
configuration will result in an error, and ``errno`` will be set to
|
|
EBADF.
|
|
|
|
|
|
Return Value
|
|
============
|
|
|
|
:ref:`open() <func-open>` returns the new file descriptor on success. On error,
|
|
-1 is returned, and ``errno`` is set appropriately. Possible error codes
|
|
are:
|
|
|
|
EACCES
|
|
The requested access to the file is not allowed.
|
|
|
|
EMFILE
|
|
The process already has the maximum number of files open.
|
|
|
|
ENFILE
|
|
The system limit on the total number of open files has been reached.
|
|
|
|
ENOMEM
|
|
Insufficient kernel memory was available.
|
|
|
|
ENXIO
|
|
No device corresponding to this device special file exists.
|