?? close.htm
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<title> UDT Reference</title>
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<div class="ref_head"> UDT Reference: Functions</div>
<h4 class="func_name"><strong>close</strong></h4>
<p>The <b>close</b> method closes a UDT connection.</p>
<div class="code">int close(<br />
UDTSOCKET <font color="#FFFFFF">u</font><br />
);</div>
<h5>Parameters</h5>
<dl>
<dt><i>u</i></dt>
<dd>[in] Descriptor identifying the socket to close.</dd>
</dl>
<h5>Return Value</h5>
<p>If success, 0 is returned; otherwise, UDT::ERROR is returned and specific error information can be retrieved by <a href="error.htm">getlasterror</a>.</p>
<table width="100%" border="1" cellpadding="2" cellspacing="0" bordercolor="#CCCCCC">
<tr>
<td width="17%" class="table_headline"><strong>Error Name</strong></td>
<td width="17%" class="table_headline"><strong>Error Code</strong></td>
<td width="83%" class="table_headline"><strong>Comment</strong></td>
</tr>
<tr>
<td>EINVSOCK</td>
<td>5004</td>
<td><i>u</i> is an invalid UDT socket.</td>
</tr>
<tr>
<td>EASYNCSND</td>
<td>6001</td>
<td><i>u</i> is non-blocking (UDT_RCVSYN = false) but <a href="opt.htm">UDT_LINGER</a> option is set to be a non-zero value.</td>
</tr>
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<h5>Description</h5>
<p>The <strong>close</strong> method gracefully shutdowns the UDT connection and releases all related data structures associated with the UDT socket. If there is no connection associated
with the socket, <strong>close</strong> simply release the socket resources.</p>
<p>On a blocking socket, if UDT_LINGER is non-zero, the <strong>close</strong> call will wait until all data in the sending buffer are sent out or the waiting time has exceeded the
expiration time set by UDT_LINGER. On a non-blocking socket, <strong>close</strong> will return immediately.</p>
<p>The closing UDT socket will send a shutdown message to the peer side so that the peer socket will also be closed. This is a best-effort message. If the message is not successfully
delivered, the peer side will also be closed after a time-out. In UDT, <u>shutdown</u> is not supported.</p>
<p>All sockets should be closed if they are not used any more.</p>
<h5>See Also</h5>
<p><strong><a href="socket.htm">socket</a>, <a href="opt.htm">setsockopt</a></strong></p>
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