linux/Documentation/media/uapi/dvb/fe-get-event.rst

.. -*- coding: utf-8; mode: rst -*-

.. _FE_GET_EVENT:

************
FE_GET_EVENT
************

Name
====

FE_GET_EVENT


Synopsis
========

.. cpp:function:: int  ioctl(int fd, int request = QPSK_GET_EVENT, struct dvb_frontend_event *ev)


Arguments
=========

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    -  .. row 1

       -  int fd

       -  File descriptor returned by a previous call to open().

    -  .. row 2

       -  int request

       -  Equals :ref:`FE_GET_EVENT` for this command.

    -  .. row 3

       -  struct dvb_frontend_event \*ev

       -  Points to the location where the event,

    -  .. row 4

       -
       -  if any, is to be stored.


Description
===========

This ioctl call returns a frontend 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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       -  ``EWOULDBLOCK``

       -  There is no event pending, and the device is in non-blocking mode.

    -  .. row 2

       -  ``EOVERFLOW``

       -  Overflow in event queue - one or more events were lost.