📄 close.htm
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" /><title> UDT Reference</title><link rel="stylesheet" href="udtdoc.css" type="text/css" /></head><body><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></table><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><p> </p></body></html>⌨️ 快捷键说明
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