1 .. SPDX-License-Identifier: GPL-2.0 OR GFDL-1.1-no-invariants-or-later 2 .. c:namespace:: MC 3 4 .. _media_request_ioc_reinit: 5 6 ****************************** 7 ioctl MEDIA_REQUEST_IOC_REINIT 8 ****************************** 9 10 Name 11 ==== 12 13 MEDIA_REQUEST_IOC_REINIT - Re-initialize a request 14 15 Synopsis 16 ======== 17 18 .. c:macro:: MEDIA_REQUEST_IOC_REINIT 19 20 ``int ioctl(int request_fd, MEDIA_REQUEST_IOC_REINIT)`` 21 22 Arguments 23 ========= 24 25 ``request_fd`` 26 File descriptor returned by :ref:`MEDIA_IOC_REQUEST_ALLOC`. 27 28 Description 29 =========== 30 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 33 request. 34 35 Re-initializing a request will clear any existing data from the request. 36 This avoids having to :c: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. 39 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. 43 44 Return Value 45 ============ 46 47 On success 0 is returned, on error -1 and the ``errno`` variable is set 48 appropriately. 49 50 EBUSY 51 The request is queued but not yet completed.
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