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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 style="margin-bottom: 0"><font face="Verdana" size="4">getsockopt</font></h1><h1 style="margin-top: 0"><font face="Verdana" size="4">setsockopt</font></h1><p><font face="Verdana" size="2">The <b>getsockopt </b>and<b> setsockopt</b> methods read and set up UDT options, respectively.</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 getsockopt(</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 face="Courier New" size="1"> int <font color="#FFFFFF"> <a class="synParam" onclick="showTip(this)">level</a></font>,</font></p> <p style="margin-top: 0; margin-bottom: 0"> <font face="Courier New" size="1"> SOCKOPT <font color="#FFFFFF"> <a class="synParam" onclick="showTip(this)">optname</a></font>,</font></p> <p style="margin-top: 0; margin-bottom: 0"> <font face="Courier New" size="1"> char *<font color="#FFFFFF"><a class="synParam" onclick="showTip(this)">optval</a></font>,</font></p> <p style="margin-top: 0; margin-bottom: 0"> <font face="Courier New" size="1"> int *<font color="#FFFFFF"><a class="synParam" onclick="showTip(this)">optlen</a></font></font></p> <p style="margin-top: 0; margin-bottom: 0"> <font face="Courier New" size="1">);</font></p> <p style="margin-top: 0; margin-bottom: 0"> </p> <p style="margin-top: 0; margin-bottom: 0"> <font face="Courier New" size="1">int setsockopt(</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 face="Courier New" size="1"> int <font color="#FFFFFF"> <a class="synParam" onclick="showTip(this)">level</a></font>,</font></p> <p style="margin-top: 0; margin-bottom: 0"> <font face="Courier New" size="1"> SOCKOPT <font color="#FFFFFF"> <a class="synParam" onclick="showTip(this)">optname</a></font>,</font></p> <p style="margin-top: 0; margin-bottom: 0"> <font face="Courier New" size="1"> const char *<font color="#FFFFFF"><a class="synParam" onclick="showTip(this)">optval</a></font>,</font></p> <p style="margin-top: 0; margin-bottom: 0"> <font face="Courier New" size="1"> int <font color="#FFFFFF"> <a class="synParam" onclick="showTip(this)">optlen</a></font></font></p> <p style="margin-top: 0; margin-bottom: 0"> <font face="Courier New" size="1">);</font></p> </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><font face="Verdana" size="2">[in] Descriptor identifying an listening socket. </font></dd> <dt><i><font face="Verdana" size="2">level</font></i></dt> <dd><font face="Verdana" size="2">[in] Ignored. For compatibility use only. </font></dd> <dt><i><font face="Verdana" size="2">optName</font></i></dt> <dd><font face="Verdana" size="2">[in] The <font color="#008000">enum</font> name of UDT option. The names and meanings are listed in the table below:</font></dd> <dt> </dt> <table border="1" cellpadding="0" cellspacing="0" style="border-collapse: collapse" id="AutoNumber3" bordercolordark="#C0C0C0" bordercolorlight="#C0C0C0" width="100%"> <tr> <th align="center" bgcolor="#C0C0C0" width="133"><b> <font face="Verdana" size="2">Name</font></b></th> <th align="center" bgcolor="#C0C0C0" width="133"><b> <font face="Verdana" size="2">Type</font></b></th> <th align="center" bgcolor="#C0C0C0" width="323"><b> <font face="Verdana" size="2">Meaning</font></b></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 size="1" face="Verdana">UDT_MSS</font></td> <td width="133"> <p style="margin-top: 1; margin-bottom: 1"> <font face="Verdana" size="1">int</font></td> <td width="323"> <p style="margin-top: 1; margin-bottom: 1"> <font face="Verdana" size="1">maximum packet size (bytes)</font></td> <td width="812"> <p style="margin-top: 1; margin-bottom: 1"> <font face="Verdana" size="1">default value is <font color="#008000">1500.</font></font></td> </tr> <tr> <td width="133"> <p style="margin-top: 1; margin-bottom: 1"> <font face="Verdana" size="1">UDT_SNDSYN</font></td> <td width="133"> <p style="margin-top: 1; margin-bottom: 1"> <font face="Verdana" size="1">bool</font></td> <td width="323"> <p style="margin-top: 1; margin-bottom: 1"> <font face="Verdana" size="1">Blocking mode of the data sending</font></td> <td width="812"> <p style="margin-top: 1; margin-bottom: 1"> <font face="Verdana" size="1"><font color="#008000">true</font>: blocking sending; <font color="#008000">false</font>: non-blocking sending. Default value is <font color="#008000">true</font>.</font></td> </tr> <tr> <td width="133"> <p style="margin-top: 1; margin-bottom: 1"> <font face="Verdana" size="1">UDT_RCVSYN</font></td> <td width="133"> <p style="margin-top: 1; margin-bottom: 1"> <font face="Verdana" size="1">bool</font></td> <td width="323"> <p style="margin-top: 1; margin-bottom: 1"> <font face="Verdana" size="1">Blocking mode of the data receiving </font></td> <td width="812"> <p style="margin-top: 1; margin-bottom: 1"> <font face="Verdana" size="1"><font color="#008000">true</font>: blocking receiving; <font color="#008000">false</font>: non-blocking receiving. Default value is <font color="#008000">true</font>.</font></td> </tr> <tr> <td width="133"> <p style="margin-top: 1; margin-bottom: 1"> <font face="Verdana" size="1">UDT_CC</font></td> <td width="133"> <p style="margin-top: 1; margin-bottom: 1"> <font face="Verdana" size="1">CCCFactory*</font><p style="margin-top: 1; margin-bottom: 1"> <font face="Verdana" size="1">CCC**</font></td> <td width="323"> <p style="margin-top: 1; margin-bottom: 1"> <font face="Verdana" size="1">Congestion control algorithm option</font></td> <td width="812"> <p style="margin-top: 1; margin-bottom: 1"> <font face="Verdana" size="1"><i>optval</i> is a pointer to a CCC Factory class. (for setsockopt)</font><p style="margin-top: 1; margin-bottom: 1"> <font face="Verdana" size="1"><i>optval</i> is a pointer of pointer to a CCC class instance. (for getsockopt)</font></td> </tr> <tr> <td width="133"> <p style="margin-top: 1; margin-bottom: 1"> <font face="Verdana" size="1">UDT_FC</font></td> <td width="133"> <p style="margin-top: 1; margin-bottom: 1"> <font face="Verdana" size="1">int</font></td> <td width="323"> <p style="margin-top: 1; margin-bottom: 1"> <font face="Verdana" size="1">Maximum flow window size</font></td> <td width="812"> <p style="margin-top: 1; margin-bottom: 1"> <font face="Verdana" size="1">Default value is <font color="#008000">25600</font>.</font></td> </tr> <tr> <td width="133"> <p style="margin-top: 1; margin-bottom: 1"> <font face="Verdana" size="1">UDT_SNDBUF</font></td> <td width="133"> <p style="margin-top: 1; margin-bottom: 1"> <font face="Verdana" size="1">int</font></td> <td width="323"> <p style="margin-top: 1; margin-bottom: 1"> <font face="Verdana" size="1">UDT sending buffer size limit</font></td> <td width="812"> <p style="margin-top: 1; margin-bottom: 1"> <font face="Verdana" size="1">Default value is <font color="#008000">40960000</font> bytes.</font></td> </tr> <tr> <td width="133"> <p style="margin-top: 1; margin-bottom: 1">⌨️ 快捷键说明
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