书上看见个例子，不知道会不会出问题，大家来看看

设置套接字记录路由struct ip_oprion_hdr
{
   usigned char code;
   usigned char length;
   usigned char offset;
   usigned long addrs[9];
}opthdr;byzero((char*)&opthdr,sizeof(opthdr));
opthdr.code=0x87;
opthdr.length=39;
opthdr.offset=4;setsockopt(s,IPPROTO_IP,IP_OPTIONS,(char *)&opthdr,sizeof(opthdr));
因为opthdr这个结构体在window平台下应该是40个字节，但路由选项只要39个字节，这样会不会出问题？