| .. SPDX-License-Identifier: GPL-2.0 OR GFDL-1.1-no-invariants-or-later |
| .. c:namespace:: MC |
| |
| .. _media_request_ioc_reinit: |
| |
| ****************************** |
| ioctl MEDIA_REQUEST_IOC_REINIT |
| ****************************** |
| |
| Name |
| ==== |
| |
| MEDIA_REQUEST_IOC_REINIT - Re-initialize a request |
| |
| Synopsis |
| ======== |
| |
| .. c:macro:: MEDIA_REQUEST_IOC_REINIT |
| |
| ``int ioctl(int request_fd, 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 :c: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. |
