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54f38fcae5
Since 2017, there is an space reserved for userspace API,
created by changeset 1d596dee38 ("docs: Create a user-space API guide").
As the media subsystem was one of the first subsystems to use
Sphinx, until this patch, we were keeping things on a separate
place.
Let's just use the new location, as having all uAPI altogether
will likely make things easier for developers.
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
79 lines
1.7 KiB
ReStructuredText
79 lines
1.7 KiB
ReStructuredText
.. 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/userspace-api/media/fdl-appendix.rst.
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..
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.. TODO: replace it to GFDL-1.1-or-later WITH no-invariant-sections
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.. _FE_GET_EVENT:
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************
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FE_GET_EVENT
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************
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Name
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====
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FE_GET_EVENT
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.. attention:: This ioctl is deprecated.
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Synopsis
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========
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.. c:function:: int ioctl(int fd, FE_GET_EVENT, struct dvb_frontend_event *ev)
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:name: FE_GET_EVENT
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Arguments
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=========
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``fd``
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File descriptor returned by :c:func:`open() <dvb-fe-open>`.
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``ev``
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Points to the location where the event, if any, is to be stored.
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Description
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===========
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This ioctl call returns a frontend event if available. If an event is
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not available, the behavior depends on whether the device is in blocking
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or non-blocking mode. In the latter case, the call fails immediately
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with errno set to ``EWOULDBLOCK``. In the former case, the call blocks until
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an event becomes available.
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Return Value
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============
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On success 0 is returned.
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On error -1 is returned, and the ``errno`` variable is set
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appropriately.
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.. flat-table::
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:header-rows: 0
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:stub-columns: 0
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- .. row 1
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- ``EWOULDBLOCK``
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- There is no event pending, and the device is in non-blocking mode.
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- .. row 2
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- ``EOVERFLOW``
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- Overflow in event queue - one or more events were lost.
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Generic error codes are described at the
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:ref:`Generic Error Codes <gen-errors>` chapter.
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