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+.. -*- coding: utf-8; mode: rst -*-
+
+.. _DMX_SET_BUFFER_SIZE:
+
+===================
+DMX_SET_BUFFER_SIZE
+===================
+
+Name
+----
+
+DMX_SET_BUFFER_SIZE
+
+
+Synopsis
+--------
+
+.. c:function:: int ioctl( int fd, DMX_SET_BUFFER_SIZE, unsigned long size)
+    :name: DMX_SET_BUFFER_SIZE
+
+
+Arguments
+---------
+
+``fd``
+    File descriptor returned by :c:func:`open() <dvb-dmx-open>`.
+
+``size``
+    Unsigned long size
+
+Description
+-----------
+
+This ioctl call is used to set the size of the circular buffer used for
+filtered data. The default size is two maximum sized sections, i.e. if
+this function is not called a buffer size of ``2 * 4096`` bytes will be
+used.
+
+
+Return Value
+------------
+
+
+On success 0 is returned.
+
+On error -1 is returned, and the ``errno`` variable is set
+appropriately.
+
+The generic error codes are described at the
+:ref:`Generic Error Codes <gen-errors>` chapter.