📄 bind.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>bind</strong></h4><p>The <b>bind</b> method binds a UDT socket to a known or an available local address.</p><div class="code">int bind(<br /> UDTSOCKET <font color="#FFFFFF">u</font>,<br /> struct sockaddr* <font color="#FFFFFF">name</font>,<br /> int* <font color="#FFFFFF">namelen</font><br />);</div><h5>Parameters</h5><dl> <dt><i>u</i></dt> <dd>[in] Descriptor identifying a UDT socket.</dd> <dt><em>name</em></dt> <dd>[out] Address to assign to the socket from the <u>sockaddr</u> structure.</dd> <dt><em>namelen</em></dt> <dd>[out] Length of the <i>name</i> structure.</dd></dl><h5>Return Value</h5><p>If the binding is successful, bind returns 0, otherwise it returns UDT::ERROR and the specific error information can be retrieved using <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>EBOUNDSOCK</td> <td>5001</td> <td><i>u</i> has already been bound to certain address.</td> </tr> <tr> <td>EINVPARAM</td> <td>5003</td> <td>the address is either invalid or unavailable.</td> </tr> <tr> <td>EINVSOCK</td> <td>5004</td> <td><i>u</i> is an invalid UDT socket.</td> </tr></table><h5>Description</h5><p>The <strong>bind</strong> method is usually to assign a UDT socket a local address, including IP address and port number. If INADDR_ANY is used, a proper IP address will be used once the UDT connection is set up. If 0 is used for the port, a randomly available port number will be used. The method <a href="sockname.htm">getsockname</a> can be used to retrieve this port number.</p><p>The <strong>bind</strong> call is necessary in all cases except for a socket to <a href="listen.htm">listen</a>. If <strong>bind</strong> is not called, UDT will automatically bind a socket to a randomly available address when a connection is set up.</p><p>By default, UDT will reuse existing UDP port for new UDT sockets, unless UDT_REUSEADDR is set to false. When UDT_REUSEADDR is false, UDT will create an exclusive UDP port for this UDT socket. UDT_REUSEADDR must be called before <strong>bind</strong>. </p><h5>See Also</h5><p><strong><a href="listen.htm">listen</a>, <a href="connect.htm">connect</a>, <a href="opt.htm">setsockopt</a>, <a href="opt.htm">getsockopt</a></strong></p><p> </p></body></html>⌨️ 快捷键说明
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