de></em> will be an empty string. This
	situation could occur if this function is called after a link
	operation that failed. If an error occurs, the return values
	<em class="parameter"><code>length</code></em>, <em class="parameter"><code>size</code></em>,
	<em class="parameter"><code>type</code></em>, and <em class="parameter"><code>name</code></em>
	will be unmodified.</p></div><div class="refsect1"><a id="errors"></a><h2>Errors</h2><p><code class="constant">GL_INVALID_VALUE</code> is generated if
	<em 