1 .. SPDX-License-Identifier: GPL-2.0 OR GFDL-1.1-or-later WITH no-invariant-sections
3 .. _media_request_ioc_reinit:
5 ******************************
6 ioctl MEDIA_REQUEST_IOC_REINIT
7 ******************************
12 MEDIA_REQUEST_IOC_REINIT - Re-initialize a request
18 .. c:function:: int ioctl( int request_fd, MEDIA_REQUEST_IOC_REINIT )
19 :name: MEDIA_REQUEST_IOC_REINIT
26 File descriptor returned by :ref:`MEDIA_IOC_REQUEST_ALLOC`.
31 If the media device supports :ref:`requests <media-request-api>`, then
32 this request ioctl can be used to re-initialize a previously allocated
35 Re-initializing a request will clear any existing data from the request.
36 This avoids having to :ref:`close() <request-func-close>` a completed
37 request and allocate a new request. Instead the completed request can just
38 be re-initialized and it is ready to be used again.
40 A request can only be re-initialized if it either has not been queued
41 yet, or if it was queued and completed. Otherwise it will set ``errno``
42 to ``EBUSY``. No other error codes can be returned.
47 On success 0 is returned, on error -1 and the ``errno`` variable is set
51 The request is queued but not yet completed.