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.. -*- coding: utf-8; mode: rst -*-
.. _DMX_GET_EVENT:
=============
DMX_GET_EVENT
=============
Name
----
DMX_GET_EVENT
Synopsis
--------
.. cpp:function:: int ioctl( int fd, int request = DMX_GET_EVENT, struct dmx_event *ev)
Arguments
---------
.. flat-table::
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- .. row 1
- int fd
- File descriptor returned by a previous call to open().
- .. row 2
- int request
- Equals DMX_GET_EVENT for this command.
- .. row 3
- struct dmx_event \*ev
- Pointer to the location where the event is to be stored.
Description
-----------
This ioctl call returns an event if available. If an event is not
available, the behavior depends on whether the device is in blocking or
non-blocking mode. In the latter case, the call fails immediately with
errno set to ``EWOULDBLOCK``. In the former case, the call blocks until an
event becomes available.
Return Value
------------
On success 0 is returned, on error -1 and the ``errno`` variable is set
appropriately. The generic error codes are described at the
:ref:`Generic Error Codes <gen-errors>` chapter.
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- .. row 1
- ``EWOULDBLOCK``
- There is no event pending, and the device is in non-blocking mode.
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