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60c2820d0f
The name of the subsystem is "media", and not "linux_tv". Also, as we plan to add other stuff there in the future, let's rename also the media uAPI book to media_uapi, to make it clearer. No functional changes. Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
76 lines
1.3 KiB
ReStructuredText
76 lines
1.3 KiB
ReStructuredText
.. -*- coding: utf-8; mode: rst -*-
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.. _DMX_GET_EVENT:
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=============
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DMX_GET_EVENT
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=============
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Name
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----
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DMX_GET_EVENT
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Synopsis
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--------
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.. cpp:function:: int ioctl( int fd, int request = DMX_GET_EVENT, struct dmx_event *ev)
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Arguments
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---------
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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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- int fd
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- File descriptor returned by a previous call to open().
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- .. row 2
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- int request
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- Equals DMX_GET_EVENT for this command.
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- .. row 3
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- struct dmx_event \*ev
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- Pointer to the location where the event is to be stored.
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Description
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-----------
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This ioctl call returns an event if available. If an event is not
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available, the behavior depends on whether the device is in blocking or
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non-blocking mode. In the latter case, the call fails immediately with
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errno set to ``EWOULDBLOCK``. In the former case, the call blocks until an
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event becomes available.
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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. The generic error codes are described at the
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:ref:`Generic Error Codes <gen-errors>` chapter.
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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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