tegrakernel/kernel/kernel-4.9/Documentation/media/uapi/dvb/dmx-start.rst

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.. -*- coding: utf-8; mode: rst -*-
.. _DMX_START:
=========
DMX_START
=========
Name
----
DMX_START
Synopsis
--------
.. c:function:: int ioctl( int fd, DMX_START)
:name: DMX_START
Arguments
---------
``fd``
File descriptor returned by :c:func:`open() <dvb-dmx-open>`.
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.