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

.. _DMX_START:

=========
DMX_START
=========

Name
----

DMX_START


Synopsis
--------

.. cpp:function:: int ioctl( int fd, int request = DMX_START)


Arguments
---------

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    -  .. row 1

       -  int fd

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

    -  .. row 2

       -  int request

       -  Equals DMX_START for this command.


Description
-----------

This ioctl call is used to start the actual filtering operation defined
via the ioctl calls DMX_SET_FILTER or DMX_SET_PES_FILTER.


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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       -  ``EINVAL``

       -  Invalid argument, i.e. no filtering parameters provided via the
	  DMX_SET_FILTER or DMX_SET_PES_FILTER functions.

    -  .. row 2

       -  ``EBUSY``

       -  This error code indicates that there are conflicting requests.
	  There are active filters filtering data from another input source.
	  Make sure that these filters are stopped before starting this
	  filter.