📄 close.htm
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<html><head><meta http-equiv="Content-Language" content="en-us"><meta http-equiv="Content-Type" content="text/html; charset=windows-1252"><title>UDT Reference</title></head><body><table border="1" cellpadding="0" cellspacing="0" style="border-collapse: collapse" width="100%" id="AutoNumber1" bgcolor="#99CCFF" bordercolor="#99CCFF"> <tr> <td width="100%"><font face="Verdana" size="2"><i> UDT Reference: UDT Functions</i></font></td> </tr></table><h1><font size="4" face="Verdana">close</font></h1><p><font face="Verdana" size="2">The <b>close</b> method closes the UDT entity.</font></p><table border="1" cellpadding="0" cellspacing="0" style="border-collapse: collapse" width="100%" id="AutoNumber2" bgcolor="#C0C0C0" bordercolor="#C0C0C0"> <tr> <td width="100%"> <p style="margin-top: 0; margin-bottom: 0"> <font face="Courier New" size="1">int close(</font></p> <p style="margin-top: 0; margin-bottom: 0"> <font face="Courier New" size="1"> UDTSOCKET <font color="#FFFFFF">u</font></font></p> <p style="margin-top: 0; margin-bottom: 0"> <font size="1" face="Courier New">);</font></td> </tr></table><h4><font face="Verdana" size="2">Parameters</font></h4><dl> <dt><i><font face="Verdana" size="2">u</font></i> </dt> <dd> <dl> <dt><font face="Verdana" size="2">[in] Descriptor identifying the socket to close. </font></dt> </dl> </dd></dl><h4><font face="Verdana" size="2">Return Values</font></h4><p><font face="Verdana" size="2">On success, 0 is returned. Otherwise, UDT::ERROR is returned and specific error information can be retrieved by <a href="error.htm">getlasterror</a>.</font></p> <table border="1" cellpadding="0" cellspacing="0" style="border-collapse: collapse" id="table1" bordercolordark="#C0C0C0" bordercolorlight="#C0C0C0" width="100%"> <tr> <th align="center" bgcolor="#C0C0C0" width="133"> <font face="Verdana" size="2">Error Code</font></th> <th align="center" bgcolor="#C0C0C0" width="812"><b> <font face="Verdana" size="2">Comment</font></b></th> </tr> <tr> <td width="133"> <p style="margin-top: 1; margin-bottom: 1"><font face="Verdana" size="1"> 5004</font></td> <td width="812"> <p style="margin-top: 1; margin-bottom: 1"><font face="Verdana" size="1"> <i>u</i> is an invalid UDT socket.</font></td> </tr> <tr> <td width="133"> <p style="margin-top: 1; margin-bottom: 1"><font face="Verdana" size="1"> 6001</font></td> <td width="812"> <p style="margin-top: 1; margin-bottom: 1"><font face="Verdana" size="1"> <i>u</i> is non-blocking (UDT_SNDSYN = false) but UDT_LINGER option is set to be non-zero.</font></td> </tr> </table><H4><font face="Verdana" size="2">Description</font></H4><P><font face="Verdana" size="2">The <b>close</b> method shutdowns the connection and releases all protocol data structures. On a blocking socket, if UDT_LINGER is non-zero, the close 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, close will return immediately.</font></P><P><font face="Verdana" size="2">The closing UDT entity will send a close request to its peer side (if a connection exists on the socket) so that the peer side will also close. However, this close information is best-effort, i.e., if the close request packet is lost, the peer side will not know the connection close until a time-out event.</font></P><P><font face="Verdana" size="2">All sockets should be closed if they are not used any more.</font></P><p></p><p></p><H4><font face="Verdana" size="2">See Also</font></H4><P><b><font face="Verdana" size="2"><a href="socket.htm">socket</a></font></b></P></body></html>⌨️ 快捷键说明
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