套接字选项

##套接字选项
1.套接字选项有两个函数
```c
    int getsockopt(int sockfd,int level,int optname,void *optval,socklen_t *optlen);
    int setsockopt(int sockfd,int level,int optname,void *optval,socklen_t optlen);
```

- level（级别）: 指定系统中解释选项的代码或者通用套接字代码，或者某个特定于协议的代码（如IPv4,IPv6,TCP或者SCTP）。

- optval: 指向某个变量的指针，使用getsockopt时，*optval是一个整数，如果返回的*optval为0,则相应的选项被禁止，不为0时，则被启用。使用setsockopt需要一个不为0的*optval值来设置启动选项，为0来禁用选项
- optlen： 表示前面optval的长度，对于getsockopt来说，它是值-结果参数，对于setsockopt来说是一个值参数。
- optname： 此选项分为两大类型
 - 启动或者禁止某个特性的二元选项（称为标志选项）
 - 取得并返回我们设置或者检查的特定值的选项
 
<table border="1" style="line-height:25px; padding:0px; margin:0px">
<tbody style="padding:0px; margin:0px">
<tr style="padding:0px; margin:0px">
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">level</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">Optname</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">get</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">set</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">说明</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">标志</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">数据类型</td>
</tr>
<tr style="padding:0px; margin:0px">
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
</tr>
<tr style="padding:0px; margin:0px">
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">SOL_SOCKET</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">SO_BROADCAST</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">允许发送广播数据报</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">int</td>
</tr>
<tr style="padding:0px; margin:0px">
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">SO_DEBUG</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">使能调试跟踪</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">int</td>
</tr>
<tr style="padding:0px; margin:0px">
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">SO_DONTROUTE</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">旁路路由表查询</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">int</td>
</tr>
<tr style="padding:0px; margin:0px">
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">SO_ERROR</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">获取待处理错误并消除</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">int</td>
</tr>
<tr style="padding:0px; margin:0px">
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">SO_KEEPALIVE</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">周期性测试连接是否存活</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">int</td>
</tr>
<tr style="padding:0px; margin:0px">
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">SO_LINGER</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">若有数据待发送则延迟关闭</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">linger{}</td>
</tr>
<tr style="padding:0px; margin:0px">
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">SO_OOBINLINE</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">让接收到的带外数据继续在线存放</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">int</td>
</tr>
<tr style="padding:0px; margin:0px">
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">SO_RCVBUF</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">接收缓冲区大小</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">int</td>
</tr>
<tr style="padding:0px; margin:0px">
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">SO_SNDBUF</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">发送缓冲区大小</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">int</td>
</tr>
<tr style="padding:0px; margin:0px">
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">SO_RCVLOWAT</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">接收缓冲区低潮限度</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">int</td>
</tr>
<tr style="padding:0px; margin:0px">
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">SO_SNDLOWAT</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">发送缓冲区低潮限度</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">int</td>
</tr>
<tr style="padding:0px; margin:0px">
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">SO_RCVTIMEO</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">接收超时</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">timeval{}</td>
</tr>
<tr style="padding:0px; margin:0px">
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">SO_SNDTIMEO</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">发送超时</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">timeval{}</td>
</tr>
<tr style="padding:0px; margin:0px">
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">SO_REUSEADDR</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">允许重用本地地址</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">int</td>
</tr>
<tr style="padding:0px; margin:0px">
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">SO_REUSEPORT</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">允许重用本地地址</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">int</td>
</tr>
<tr style="padding:0px; margin:0px">
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">SO_TYPE</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">取得套接口类型</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">int</td>
</tr>
<tr style="padding:0px; margin:0px">
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">SO_USELOOPBACK</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">路由套接口取得所发送数据的拷贝</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">int</td>
</tr>
<tr style="padding:0px; margin:0px">
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
</tr>
<tr style="padding:0px; margin:0px">
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">IPPROTO_IP</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">IP_HDRINCL</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">IP头部包括数据</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">int</td>
</tr>
<tr style="padding:0px; margin:0px">
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">IP_OPTIONS</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">IP头部选项</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">见后面说明</td>
</tr>
<tr style="padding:0px; margin:0px">
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">IP_RECVDSTADDR</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">返回目的IP地址</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">int</td>
</tr>
<tr style="padding:0px; margin:0px">
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">IP_RECVIF</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">返回接收到的接口索引</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">int</td>
</tr>
<tr style="padding:0px; margin:0px">
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">IP_TOS</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">服务类型和优先权</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">int</td>
</tr>
<tr style="padding:0px; margin:0px">
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">IP_TTL</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">存活时间</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">int</td>
</tr>
<tr style="padding:0px; margin:0px">
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">IP_MULTICAST_IF</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">指定外出接口</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">in_addr{}</td>
</tr>
<tr style="padding:0px; margin:0px">
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">IP_MULTICAST_TTL</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">指定外出TTL</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">u_char</td>
</tr>
<tr style="padding:0px; margin:0px">
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">IP_MULTICAST_LOOP</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">指定是否回馈</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">u_char</td>
</tr>
<tr style="padding:0px; margin:0px">
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">IP_ADD_MEMBERSHIP</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">加入多播组</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">ip_mreq{}</td>
</tr>
<tr style="padding:0px; margin:0px">
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">IP_DROP_MEMBERSHIP</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">离开多播组</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">ip_mreq{}</td>
</tr>
<tr style="padding:0px; margin:0px">
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
</tr>
<tr style="padding:0px; margin:0px">
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">IPPROTO_ICMPV6</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">ICMP6_FILTER</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">指定传递的ICMPv6消息类型</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">icmp6_filter{}</td>
</tr>
<tr style="padding:0px; margin:0px">
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
</tr>
<tr style="padding:0px; margin:0px">
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">IPPROTO_IPV6</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">IPV6_ADDRFORM</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">改变套接口的地址结构</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">int</td>
</tr>
<tr style="padding:0px; margin:0px">
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">IPV6_CHECKSUM</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">原始套接口的校验和字段偏移</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">int</td>
</tr>
<tr style="padding:0px; margin:0px">
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">IPV6_DSTOPTS</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">接收目标选项</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">int</td>
</tr>
<tr style="padding:0px; margin:0px">
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">IPV6_HOPLIMIT</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">接收单播跳限</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">int</td>
</tr>
<tr style="padding:0px; margin:0px">
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">IPV6_HOPOPTS</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">接收步跳选项</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">int</td>
</tr>
<tr style="padding:0px; margin:0px">
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">IPV6_NEXTHOP</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">指定下一跳地址</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">sockaddr{}</td>
</tr>
<tr style="padding:0px; margin:0px">
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">IPV6_PKTINFO</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">接收分组信息</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">int</td>
</tr>
<tr style="padding:0px; margin:0px">
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">IPV6_PKTOPTIONS</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">指定分组选项</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">见后面说明</td>
</tr>
<tr style="padding:0px; margin:0px">
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">IPV6_RTHDR</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">接收原路径</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">int</td>
</tr>
<tr style="padding:0px; margin:0px">
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">IPV6_UNICAST_HOPS</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">缺省单播跳限</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">int</td>
</tr>
<tr style="padding:0px; margin:0px">
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">IPV6_MULTICAST_IF</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">指定外出接口</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">in6_addr{}</td>
</tr>
<tr style="padding:0px; margin:0px">
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">IPV6_MULTICAST_HOPS</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">指定外出跳限</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">u_int</td>
</tr>
<tr style="padding:0px; margin:0px">
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">IPV6_MULTICAST_LOOP</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">指定是否回馈</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">u_int</td>
</tr>
<tr style="padding:0px; margin:0px">
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">IPV6_ADD_MEMBERSHIP</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">加入多播组</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">ipv6_mreq{}</td>
</tr>
<tr style="padding:0px; margin:0px">
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">IPV6_DROP_MEMBERSHIP</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">离开多播组</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">ipv6_mreq{}</td>
</tr>
<tr style="padding:0px; margin:0px">
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
</tr>
<tr style="padding:0px; margin:0px">
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">IPPROTO_TCP</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">TCP_KEEPALIVE</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">控测对方是否存活前连接闲置秒数</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">int</td>
</tr>
<tr style="padding:0px; margin:0px">
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">TCP_MAXRT</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">TCP最大重传时间</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">int</td>
</tr>
<tr style="padding:0px; margin:0px">
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">TCP_MAXSEG</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">TCP最大分节大小</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">int</td>
</tr>
<tr style="padding:0px; margin:0px">
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">TCP_NODELAY</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">禁止Nagle算法</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">int</td>
</tr>
<tr style="padding:0px; margin:0px">
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt"> 
</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">TCP_STDURG</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">紧急指针的解释</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">y</td>
<td style="line-height:23px; padding:0px; margin:0px; font-size:10pt">int</td>
</tr>
</tbody>
</table>

Simon 's Blog

导航

OHH,最近发表

这里随便填填,没事