?? bind.htm
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<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>
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