t is a <code class="computeroutput"><span class="keyword">bool</span></code> meaning <code class="computeroutput"><span class="keyword">true</span></code>
                  if there may be additional buffers returned on a subsequent call,
                  or <code class="computeroutput"><span class="keyword">false</span></code> if the buffer
                  returned on this call is the last buffer representing the body.
                  The function will ensure that <code class="computeroutput"><span cl