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+.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
+.. c:namespace:: DTV.dmx
+
+.. _DMX_START:
+
+=========
+DMX_START
+=========
+
+Name
+----
+
+DMX_START
+
+Synopsis
+--------
+
+.. c:macro:: DMX_START
+
+``int ioctl(int fd, DMX_START)``
+
+Arguments
+---------
+
+``fd``
+    File descriptor returned by :c:func:`open()`.
+
+Description
+-----------
+
+This ioctl call is used to start the actual filtering operation defined
+via the ioctl calls :ref:`DMX_SET_FILTER` or :ref:`DMX_SET_PES_FILTER`.
+
+Return Value
+------------
+
+On success 0 is returned.
+
+On error -1 is returned, and the ``errno`` variable is set
+appropriately.
+
+.. tabularcolumns:: |p{2.5cm}|p{15.0cm}|
+
+.. flat-table::
+    :header-rows:  0
+    :stub-columns: 0
+
+    -  .. row 1
+
+       -  ``EINVAL``
+
+       -  Invalid argument, i.e. no filtering parameters provided via the
+	  :ref:`DMX_SET_FILTER` or :ref:`DMX_SET_PES_FILTER` ioctls.
+
+    -  .. 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.
+
+The generic error codes are described at the
+:ref:`Generic Error Codes <gen-errors>` chapter.