SSL I/O operation completed. This result code is returned if and only if <b>ret &gt; 0</b>.</p>

</dd>
<dt id="SSL_ERROR_ZERO_RETURN">SSL_ERROR_ZERO_RETURN</dt>
<dd>

<p>The TLS/SSL peer has closed the connection for writing by sending the close_notify alert. No more data can be read. Note that <b>SSL_ERROR_ZERO_RETURN</b> does not necessarily indicate that the underlying transport has been closed.</p>

<p>This error can also appear when the option <b>SSL_OP_IGNORE_UNEXPECTED_EOF</b> is set. See <a href="..