76 lines
2.4 KiB
ReStructuredText
76 lines
2.4 KiB
ReStructuredText
.. This file is dual-licensed: you can use it either under the terms
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.. of the GPL 2.0 or the GFDL 1.1+ license, at your option. Note that this
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.. dual licensing only applies to this file, and not this project as a
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.. whole.
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..
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.. a) This file is free software; you can redistribute it and/or
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.. modify it under the terms of the GNU General Public License as
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.. published by the Free Software Foundation version 2 of
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.. the License.
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..
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.. This file is distributed in the hope that it will be useful,
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.. but WITHOUT ANY WARRANTY; without even the implied warranty of
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.. MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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.. GNU General Public License for more details.
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..
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.. Or, alternatively,
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..
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.. b) Permission is granted to copy, distribute and/or modify this
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.. document under the terms of the GNU Free Documentation License,
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.. Version 1.1 or any later version published by the Free Software
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.. Foundation, with no Invariant Sections, no Front-Cover Texts
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.. and no Back-Cover Texts. A copy of the license is included at
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.. Documentation/media/uapi/fdl-appendix.rst.
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..
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.. TODO: replace it to GPL-2.0 OR GFDL-1.1-or-later WITH no-invariant-sections
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.. _media_request_ioc_reinit:
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******************************
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ioctl MEDIA_REQUEST_IOC_REINIT
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******************************
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Name
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====
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MEDIA_REQUEST_IOC_REINIT - Re-initialize a request
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Synopsis
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========
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.. c:function:: int ioctl( int request_fd, MEDIA_REQUEST_IOC_REINIT )
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:name: MEDIA_REQUEST_IOC_REINIT
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Arguments
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=========
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``request_fd``
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File descriptor returned by :ref:`MEDIA_IOC_REQUEST_ALLOC`.
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Description
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===========
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If the media device supports :ref:`requests <media-request-api>`, then
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this request ioctl can be used to re-initialize a previously allocated
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request.
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Re-initializing a request will clear any existing data from the request.
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This avoids having to :ref:`close() <request-func-close>` a completed
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request and allocate a new request. Instead the completed request can just
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be re-initialized and it is ready to be used again.
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A request can only be re-initialized if it either has not been queued
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yet, or if it was queued and completed. Otherwise it will set ``errno``
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to ``EBUSY``. No other error codes can be returned.
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Return Value
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============
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On success 0 is returned, on error -1 and the ``errno`` variable is set
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appropriately.
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EBUSY
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The request is queued but not yet completed.
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