blob: cfd503bdef702eb7fd07286681e535dca42cbc2a (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
|
.. SPDX-License-Identifier: GPL-2.0 OR GFDL-1.1-no-invariants-or-later
.. _media_request_ioc_reinit:
******************************
ioctl MEDIA_REQUEST_IOC_REINIT
******************************
Name
====
MEDIA_REQUEST_IOC_REINIT - Re-initialize a request
Synopsis
========
.. c:function:: int ioctl( int request_fd, MEDIA_REQUEST_IOC_REINIT )
:name: MEDIA_REQUEST_IOC_REINIT
Arguments
=========
``request_fd``
File descriptor returned by :ref:`MEDIA_IOC_REQUEST_ALLOC`.
Description
===========
If the media device supports :ref:`requests <media-request-api>`, then
this request ioctl can be used to re-initialize a previously allocated
request.
Re-initializing a request will clear any existing data from the request.
This avoids having to :ref:`close() <request-func-close>` a completed
request and allocate a new request. Instead the completed request can just
be re-initialized and it is ready to be used again.
A request can only be re-initialized if it either has not been queued
yet, or if it was queued and completed. Otherwise it will set ``errno``
to ``EBUSY``. No other error codes can be returned.
Return Value
============
On success 0 is returned, on error -1 and the ``errno`` variable is set
appropriately.
EBUSY
The request is queued but not yet completed.
|
