📄 accept.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>accept</strong></h4><p>The <b>accept</b> method retrieves an incoming connection.</p><div class="code">UDTSOCKET accept(<br /> UDTSOCKET <font color="#FFFFFF">u</font>,<br /> struct sockaddr* <font color="#FFFFFF">addr</font>,<br /> int* <font color="#FFFFFF">addrlen</font><br />);</div><h5>Parameters</h5><dl> <dt><i>u</i></dt> <dd>[in] Descriptor identifying a listening socket.</dd> <dt><em>addr</em></dt> <dd>[out] Address of the peer side of the new accepted connection.</dd> <dt><em>addrlen</em></dt> <dd>[out] Length of the <i>addr</i> structure.</dd></dl><h5>Return Value</h5><p>If no error occurs, <b>accept</b> returns the UDT socket descriptor of the new connection; otherwise, it returns UDT::INVALID_SOCK.</p><p>On a successful return, the address of the peer side of the connection is written into <i>addr</i>, and its length is in <i>addrlen</i>, if the <i>addr</i> parameter is not NULL.</p><p>If an error is returned, the error information can be retrieved by <a href="error.htm">getlasterror</a>. One of the following error can cause an <b>accept</b> error:</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>ENOLISTEN</td> <td>5006</td> <td><i>u</i> is not in the listening state.</td> </tr> <tr> <td>ERDVNOSERV</td> <td>5007</td> <td><i>u</i> is set up to support rendezvous connection.</td> </tr> <tr> <td>EASYNCRCV</td> <td>6002</td> <td><i>u</i> is non-blocking (UDT_RCVSYN = false) but there is no connection available.</td> </tr></table><h5>Description</h5><p>Once a UDT socket is in listening state, it accepts new connections and maintains the pending connections in a queue. An <strong>accept</strong> call retrieves the first connection in the queue, removes it from the queue, and returns the associate socket descriptor. </p><p>If there is no connections in the queue when <strong>accept</strong> is called, a blocking socket will wait until a new connection is set up, whereas a non-blocking socket will return immediately with an error.</p><p>The accepted sockets will inherit all proper attributes from the listening socket.</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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