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+.. -*- coding: utf-8; mode: rst -*-
+
+.. _DMX_SET_BUFFER_SIZE:
+
+===================
+DMX_SET_BUFFER_SIZE
+===================
+
+Name
+----
+
+DMX_SET_BUFFER_SIZE
+
+
+Synopsis
+--------
+
+.. cpp:function:: int ioctl( int fd, int request = DMX_SET_BUFFER_SIZE, unsigned long size)
+
+
+Arguments
+---------
+
+.. flat-table::
+    :header-rows:  0
+    :stub-columns: 0
+
+
+    -  .. row 1
+
+       -  int fd
+
+       -  File descriptor returned by a previous call to open().
+
+    -  .. row 2
+
+       -  int request
+
+       -  Equals DMX_SET_BUFFER_SIZE for this command.
+
+    -  .. row 3
+
+       -  unsigned long size
+
+       -  Size of circular buffer.
+
+
+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 and the ``errno`` variable is set
+appropriately. The generic error codes are described at the
+:ref:`Generic Error Codes <gen-errors>` chapter.