{"id":15881,"date":"2025-04-18T22:22:45","date_gmt":"2025-04-18T14:22:45","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/15881.html"},"modified":"2025-04-18T22:22:45","modified_gmt":"2025-04-18T14:22:45","slug":"tcp%e6%9c%8d%e5%8a%a1%e5%99%a8%e7%9b%91%e5%90%ac%e7%8a%b6%e6%80%81%e6%a3%80%e6%b5%8b%e5%8e%9f%e7%90%86%e4%b8%8e%e5%ae%9e%e7%8e%b0%e6%8a%80%e6%9c%af%ef%bc%88c-c%e4%bb%a3%e7%a0%81%e5%ae%9e%e7%8e%b0","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/15881.html","title":{"rendered":"TCP\u670d\u52a1\u5668\u76d1\u542c\u72b6\u6001\u68c0\u6d4b\u539f\u7406\u4e0e\u5b9e\u73b0\u6280\u672f\uff08C\/C++\u4ee3\u7801\u5b9e\u73b0\uff09"},"content":{"rendered":"<p>\u5728\u7f51\u7edc\u5b89\u5168\u548c\u7cfb\u7edf\u7ba1\u7406\u4e2d&#xff0c;\u68c0\u6d4bTCP\u670d\u52a1\u5668\u662f\u5426\u6b63\u5728\u76d1\u542c\u7279\u5b9a\u7aef\u53e3\u662f\u4e00\u9879\u5e38\u89c1\u4efb\u52a1\u3002\u672c\u6587\u5c06\u4ecb\u7ecd\u4e00\u4e2a\u57fa\u4e8eC\u8bed\u8a00\u5b9e\u73b0\u7684TCP\u670d\u52a1\u5668\u76d1\u542c\u68c0\u6d4b\u5de5\u5177\u7684\u539f\u7406\u3001\u76f8\u5173\u6280\u672f\u548c\u5b9e\u73b0\u7ec6\u8282\u3002<\/p>\n<h3>\u6982\u8ff0<\/h3>\n<p>\u8be5\u5de5\u5177\u901a\u8fc7\u53d1\u9001TCP\u8fde\u63a5\u8bf7\u6c42\u6765\u68c0\u6d4b\u76ee\u6807\u670d\u52a1\u5668\u662f\u5426\u5728\u6307\u5b9a\u7aef\u53e3\u4e0a\u76d1\u542c\u3002\u5b83\u652f\u6301IPv4\u548cIPv6&#xff0c;\u5e76\u5141\u8bb8\u7528\u6237\u81ea\u5b9a\u4e49\u8fde\u63a5\u8d85\u65f6\u548c\u7b49\u5f85\u8d85\u65f6\u65f6\u95f4\u3002\u5de5\u5177\u7684\u6838\u5fc3\u529f\u80fd\u5305\u62ec&#xff1a;<\/p>\n<ul>\n<li>\u68c0\u6d4bTCP\u670d\u52a1\u5668\u662f\u5426\u76d1\u542c\u7279\u5b9a\u7aef\u53e3\u3002<\/li>\n<li>\u652f\u6301\u975e\u963b\u585e\u8fde\u63a5\u548c\u8d85\u65f6\u673a\u5236\u3002<\/li>\n<li>\u63d0\u4f9b\u7075\u6d3b\u7684\u547d\u4ee4\u884c\u9009\u9879\u914d\u7f6e\u3002<\/li>\n<\/ul>\n<h3>\u6280\u672f\u539f\u7406<\/h3>\n<h4>1. TCP\u4e09\u6b21\u63e1\u624b<\/h4>\n<p>TCP\u8fde\u63a5\u7684\u5efa\u7acb\u57fa\u4e8e\u4e09\u6b21\u63e1\u624b\u8fc7\u7a0b&#xff1a;<\/p>\n<li>\u5ba2\u6237\u7aef\u53d1\u9001SYN\u5305\u5230\u670d\u52a1\u5668\u3002<\/li>\n<li>\u670d\u52a1\u5668\u54cd\u5e94SYN-ACK\u5305\u3002<\/li>\n<li>\u5ba2\u6237\u7aef\u53d1\u9001ACK\u5305\u5b8c\u6210\u63e1\u624b\u3002<\/li>\n<p>\u5982\u679c\u670d\u52a1\u5668\u6b63\u5728\u76d1\u542c\u76ee\u6807\u7aef\u53e3&#xff0c;\u5b83\u4f1a\u54cd\u5e94SYN-ACK\u5305&#xff1b;\u5426\u5219&#xff0c;\u8fde\u63a5\u5c06\u5931\u8d25\u6216\u8d85\u65f6\u3002<\/p>\n<h4>2. \u975e\u963b\u585e\u8fde\u63a5<\/h4>\n<p>\u975e\u963b\u585e\u5957\u63a5\u5b57\u5141\u8bb8\u7a0b\u5e8f\u5728\u53d1\u8d77\u8fde\u63a5\u540e\u7acb\u5373\u8fd4\u56de&#xff0c;\u800c\u65e0\u9700\u7b49\u5f85\u8fde\u63a5\u5b8c\u6210\u3002\u8fd9\u4f7f\u5f97\u7a0b\u5e8f\u53ef\u4ee5\u5728\u8fde\u63a5\u8fc7\u7a0b\u4e2d\u6267\u884c\u5176\u4ed6\u4efb\u52a1&#xff0c;\u63d0\u9ad8\u6548\u7387\u3002<\/p>\n<h4>3. poll\u673a\u5236<\/h4>\n<p>poll\u7cfb\u7edf\u8c03\u7528\u7528\u4e8e\u76d1\u63a7\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u72b6\u6001&#xff08;\u5982\u662f\u5426\u53ef\u8bfb\u3001\u53ef\u5199\u6216\u51fa\u9519&#xff09;\u3002\u5728\u672c\u5de5\u5177\u4e2d&#xff0c;poll\u7528\u4e8e\u68c0\u6d4b\u5957\u63a5\u5b57\u662f\u5426\u51c6\u5907\u597d\u8fdb\u884c\u6570\u636e\u4f20\u8f93\u6216\u662f\u5426\u5b58\u5728\u9519\u8bef\u3002<\/p>\n<h3>TCP\u670d\u52a1\u5668\u76d1\u542c\u72b6\u6001\u68c0\u6d4b\u539f\u7406\u4e0e\u5b9e\u73b0\u6280\u672f&#xff08;C\/C&#043;&#043;\u4ee3\u7801\u5b9e\u73b0&#xff09;<\/h3>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">scanfix<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">char<\/span> <span class=\"token operator\">*<\/span>s<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">uint64_t<\/span> <span class=\"token operator\">*<\/span>result<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> scale<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><br \/>\n<span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span>s<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">unsigned<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span>s<span class=\"token punctuation\">)<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token char\">&#039;0&#039;<\/span> <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>r <span class=\"token operator\">&lt;&#061;<\/span> UINT64_MAX<span class=\"token operator\">\/<\/span><span class=\"token number\">10<\/span> <span class=\"token operator\">&amp;&amp;<\/span> <span class=\"token number\">10<\/span><span class=\"token operator\">*<\/span>r <span class=\"token operator\">&lt;&#061;<\/span> UINT64_MAX<span class=\"token operator\">&#8211;<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span>s<span class=\"token punctuation\">)<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token char\">&#039;0&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\nr <span class=\"token operator\">&#061;<\/span> r<span class=\"token operator\">*<\/span><span class=\"token number\">10<\/span> <span class=\"token operator\">&#043;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span>s<span class=\"token punctuation\">)<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token char\">&#039;0&#039;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">else<\/span><br \/>\n<span class=\"token keyword\">return<\/span> <span class=\"token operator\">&#8211;<\/span>ERANGE<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span>s <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token char\">&#039;.&#039;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>d<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token keyword\">return<\/span> <span class=\"token operator\">&#8211;<\/span>EINVAL<span class=\"token punctuation\">;<\/span><br \/>\nd <span class=\"token operator\">&#061;<\/span> s <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">return<\/span> <span class=\"token operator\">&#8211;<\/span>EINVAL<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>s<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span>d<span class=\"token punctuation\">)<\/span><br \/>\nd <span class=\"token operator\">&#061;<\/span> s<span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> o <span class=\"token operator\">&#061;<\/span> scale <span class=\"token operator\">&#8211;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">(<\/span>s<span class=\"token operator\">&#8211;<\/span>d<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">;<\/span> o <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> o<span class=\"token operator\">&#8212;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>r <span class=\"token operator\">&gt;<\/span> UINT64_MAX<span class=\"token operator\">\/<\/span><span class=\"token number\">10<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token keyword\">return<\/span> <span class=\"token operator\">&#8211;<\/span>ERANGE<span class=\"token punctuation\">;<\/span><br \/>\nr <span class=\"token operator\">*&#061;<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">;<\/span> o <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> o<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>r <span class=\"token operator\">%<\/span> <span class=\"token number\">10<\/span> <span class=\"token operator\">!&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token keyword\">return<\/span> <span class=\"token operator\">&#8211;<\/span>ERANGE<span class=\"token punctuation\">;<\/span><br \/>\nr <span class=\"token operator\">\/&#061;<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token operator\">*<\/span>result <span class=\"token operator\">&#061;<\/span> r<span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">int<\/span><br \/>\n<span class=\"token function\">syn_scan<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">addrinfo<\/span> <span class=\"token operator\">*<\/span>addr<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">int<\/span> sock <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">socket<\/span><span class=\"token punctuation\">(<\/span>addr<span class=\"token operator\">-&gt;<\/span>ai_family<span class=\"token punctuation\">,<\/span><br \/>\n    addr<span class=\"token operator\">-&gt;<\/span>ai_socktype <span class=\"token operator\">|<\/span> SOCK_NONBLOCK<span class=\"token punctuation\">,<\/span><br \/>\n    addr<span class=\"token operator\">-&gt;<\/span>ai_protocol<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">linger<\/span> l <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token function\">setsockopt<\/span><span class=\"token punctuation\">(<\/span>sock<span class=\"token punctuation\">,<\/span> SOL_SOCKET<span class=\"token punctuation\">,<\/span> SO_LINGER<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">void<\/span> <span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">&amp;<\/span>l<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">linger<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> zero <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token function\">setsockopt<\/span><span class=\"token punctuation\">(<\/span>sock<span class=\"token punctuation\">,<\/span> IPPROTO_TCP<span class=\"token punctuation\">,<\/span> TCP_QUICKACK<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">void<\/span> <span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">&amp;<\/span>zero<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span> zero<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> r<span class=\"token punctuation\">;<\/span><br \/>\nerrno <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\nr <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">connect<\/span><span class=\"token punctuation\">(<\/span>sock<span class=\"token punctuation\">,<\/span> addr<span class=\"token operator\">-&gt;<\/span>ai_addr<span class=\"token punctuation\">,<\/span> addr<span class=\"token operator\">-&gt;<\/span>ai_addrlen<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>r <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">0<\/span> <span class=\"token operator\">||<\/span> errno <span class=\"token operator\">!&#061;<\/span> EINPROGRESS<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token function\">fprintf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token constant\">stderr<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;connect failed: %m\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>sock<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">return<\/span> <span class=\"token number\">99<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">pollfd<\/span> fds<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\nfds<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">pollfd<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span> sock<span class=\"token punctuation\">,<\/span> POLLIN <span class=\"token operator\">|<\/span> POLLOUT <span class=\"token operator\">|<\/span> POLLERR<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span> <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\nr <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">poll<\/span><span class=\"token punctuation\">(<\/span>fds<span class=\"token punctuation\">,<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> connect_timeout<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>r <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;timeout&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">return<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>r <span class=\"token operator\">!&#061;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;??? poll &#061; %d %m\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> r<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>sock<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">return<\/span> <span class=\"token number\">99<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><\/p>\n<p><span class=\"token keyword\">return<\/span> <span class=\"token number\">99<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">int<\/span><br \/>\n<span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> argc<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">char<\/span> <span class=\"token operator\">*<\/span>argv<span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><\/p>\n<p><span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>c <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">getopt<\/span><span class=\"token punctuation\">(<\/span>argc<span class=\"token punctuation\">,<\/span> argv<span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;&#043;46t:w:&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">!&#061;<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">switch<\/span> <span class=\"token punctuation\">(<\/span>c<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">case<\/span> <span class=\"token char\">&#039;4&#039;<\/span><span class=\"token operator\">:<\/span> protocol <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">4<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">case<\/span> <span class=\"token char\">&#039;6&#039;<\/span><span class=\"token operator\">:<\/span> protocol <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">6<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token keyword\">case<\/span> <span class=\"token char\">&#039;t&#039;<\/span><span class=\"token operator\">:<\/span><br \/>\n<span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>err <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">scanfix<\/span><span class=\"token punctuation\">(<\/span>optarg<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>connect_timeout<span class=\"token punctuation\">,<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token function\">fprintf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token constant\">stderr<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;failed to parse number &#039;%s&#039;: %s\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    optarg<span class=\"token punctuation\">,<\/span> <span class=\"token function\">strerror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&#8211;<\/span>err<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">goto<\/span> usage<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token keyword\">case<\/span> <span class=\"token char\">&#039;w&#039;<\/span><span class=\"token operator\">:<\/span><br \/>\n<span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>err <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">scanfix<\/span><span class=\"token punctuation\">(<\/span>optarg<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>wait_timeout<span class=\"token punctuation\">,<\/span> <span class=\"token number\">9<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token function\">fprintf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token constant\">stderr<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;failed to parse number &#039;%s&#039;: %s\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    optarg<span class=\"token punctuation\">,<\/span> <span class=\"token function\">strerror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&#8211;<\/span>err<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">goto<\/span> usage<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token keyword\">default<\/span><span class=\"token operator\">:<\/span><br \/>\nusage<span class=\"token operator\">:<\/span><br \/>\n                        <span class=\"token function\">fprintf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token constant\">stderr<\/span><span class=\"token punctuation\">,<\/span><br \/>\n                            <span class=\"token string\">&#034;Usage: %s [-w WAIT_TIMEOUT] [-t CONNECT_TIMEOUT] [HOST] PORT\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span><br \/>\n                            argv<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                        <span class=\"token keyword\">return<\/span> <span class=\"token number\">99<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">addrinfo<\/span> hints <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token punctuation\">.<\/span>ai_socktype <span class=\"token operator\">&#061;<\/span> SOCK_STREAM<span class=\"token punctuation\">,<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token operator\">*<\/span>res<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><\/p>\n<p><span class=\"token function\">clock_gettime<\/span><span class=\"token punctuation\">(<\/span>CLOCK_MONOTONIC<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>now<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\ndeadline<span class=\"token punctuation\">.<\/span>tv_sec <span class=\"token operator\">&#061;<\/span> now<span class=\"token punctuation\">.<\/span>tv_sec<span class=\"token punctuation\">;<\/span><br \/>\ndeadline<span class=\"token punctuation\">.<\/span>tv_nsec <span class=\"token operator\">&#061;<\/span> now<span class=\"token punctuation\">.<\/span>tv_nsec <span class=\"token operator\">&#043;<\/span> wait_timeout<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>deadline<span class=\"token punctuation\">.<\/span>tv_nsec <span class=\"token operator\">&gt;&#061;<\/span> <span class=\"token number\">1000000000L<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\ndeadline<span class=\"token punctuation\">.<\/span>tv_sec <span class=\"token operator\">&#043;&#061;<\/span> deadline<span class=\"token punctuation\">.<\/span>tv_nsec <span class=\"token operator\">\/<\/span> <span class=\"token number\">1000000000L<\/span><span class=\"token punctuation\">;<\/span><br \/>\ndeadline<span class=\"token punctuation\">.<\/span>tv_nsec <span class=\"token operator\">&#061;<\/span> deadline<span class=\"token punctuation\">.<\/span>tv_nsec <span class=\"token operator\">%<\/span> <span class=\"token number\">1000000000L<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><\/p>\n<p><span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span>now<span class=\"token punctuation\">.<\/span>tv_sec <span class=\"token operator\">&lt;<\/span> deadline<span class=\"token punctuation\">.<\/span>tv_sec <span class=\"token operator\">||<\/span><br \/>\n    <span class=\"token punctuation\">(<\/span>now<span class=\"token punctuation\">.<\/span>tv_sec <span class=\"token operator\">&#061;&#061;<\/span> deadline<span class=\"token punctuation\">.<\/span>tv_sec <span class=\"token operator\">&amp;&amp;<\/span> now<span class=\"token punctuation\">.<\/span>tv_nsec <span class=\"token operator\">&lt;&#061;<\/span> deadline<span class=\"token punctuation\">.<\/span>tv_nsec<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">switch<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token function\">syn_scan<\/span><span class=\"token punctuation\">(<\/span>res<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">case<\/span> <span class=\"token number\">0<\/span><span class=\"token operator\">:<\/span><br \/>\n<span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">case<\/span> <span class=\"token number\">99<\/span><span class=\"token operator\">:<\/span><br \/>\n<span class=\"token keyword\">return<\/span> <span class=\"token number\">99<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">case<\/span> <span class=\"token number\">1<\/span><span class=\"token operator\">:<\/span><br \/>\n<span class=\"token function\">nanosleep<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>delay<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>   <span class=\"token comment\">\/\/ avoid busy wait<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token function\">clock_gettime<\/span><span class=\"token punctuation\">(<\/span>CLOCK_MONOTONIC<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>now<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">return<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>If you need the complete source code, please add the WeChat number (c17865354792)<\/p>\n<h4>1. \u547d\u4ee4\u884c\u53c2\u6570\u89e3\u6790<\/h4>\n<p>\u5de5\u5177\u901a\u8fc7getopt\u51fd\u6570\u89e3\u6790\u547d\u4ee4\u884c\u53c2\u6570&#xff0c;\u652f\u6301\u4ee5\u4e0b\u9009\u9879&#xff1a;<\/p>\n<ul>\n<li>-4&#xff1a;\u5f3a\u5236\u4f7f\u7528IPv4\u3002<\/li>\n<li>-6&#xff1a;\u5f3a\u5236\u4f7f\u7528IPv6\u3002<\/li>\n<li>-t&#xff1a;\u8bbe\u7f6e\u8fde\u63a5\u8d85\u65f6\u65f6\u95f4&#xff08;\u5355\u4f4d&#xff1a;\u6beb\u79d2&#xff09;\u3002<\/li>\n<li>-w&#xff1a;\u8bbe\u7f6e\u7b49\u5f85\u8d85\u65f6\u65f6\u95f4&#xff08;\u5355\u4f4d&#xff1a;\u7eb3\u79d2&#xff09;\u3002<\/li>\n<\/ul>\n<h4>2. \u5730\u5740\u89e3\u6790<\/h4>\n<p>\u4f7f\u7528getaddrinfo\u51fd\u6570\u5c06\u76ee\u6807\u4e3b\u673a\u540d\u548c\u7aef\u53e3\u89e3\u6790\u4e3a\u5957\u63a5\u5b57\u5730\u5740\u7ed3\u6784&#xff08;struct 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\u7b49\u5f85\u673a\u5236<\/h4>\n<p>\u5982\u679c\u7528\u6237\u6307\u5b9a\u4e86\u7b49\u5f85\u8d85\u65f6\u65f6\u95f4&#xff08;-w\u9009\u9879&#xff09;&#xff0c;\u5de5\u5177\u5c06\u5728\u6307\u5b9a\u65f6\u95f4\u5185\u53cd\u590d\u5c1d\u8bd5\u8fde\u63a5\u76ee\u6807\u670d\u52a1\u5668\u3002\u6bcf\u6b21\u5c1d\u8bd5\u4e4b\u95f4\u4f1a\u4f7f\u7528nanosleep\u51fd\u6570\u5f15\u5165\u5ef6\u8fdf&#xff0c;\u907f\u514d\u9891\u7e41\u5c1d\u8bd5\u3002<\/p>\n<h3>\u5e94\u7528\u573a\u666f<\/h3>\n<p>\u8be5\u5de5\u5177\u9002\u7528\u4e8e\u4ee5\u4e0b\u573a\u666f&#xff1a;<\/p>\n<ul>\n<li>\u7f51\u7edc\u5b89\u5168\u626b\u63cf&#xff1a;\u68c0\u6d4b\u76ee\u6807\u670d\u52a1\u5668\u7684\u5f00\u653e\u7aef\u53e3\u3002<\/li>\n<li>\u670d\u52a1\u76d1\u63a7&#xff1a;\u68c0\u67e5\u5173\u952e\u670d\u52a1\u662f\u5426\u6b63\u5e38\u8fd0\u884c\u3002<\/li>\n<li>\u81ea\u52a8\u5316\u6d4b\u8bd5&#xff1a;\u9a8c\u8bc1\u7f51\u7edc\u670d\u52a1\u7684\u53ef\u7528\u6027\u3002<\/li>\n<\/ul>\n<h3>\u603b\u7ed3<\/h3>\n<p>\u672c\u6587\u4ecb\u7ecd\u4e86\u57fa\u4e8eC\u8bed\u8a00\u5b9e\u73b0\u7684TCP\u670d\u52a1\u5668\u76d1\u542c\u68c0\u6d4b\u5de5\u5177\u7684\u539f\u7406\u548c\u5b9e\u73b0\u7ec6\u8282\u3002\u901a\u8fc7\u975e\u963b\u585e\u8fde\u63a5\u3001poll\u673a\u5236\u548c\u7075\u6d3b\u7684\u8d85\u65f6\u914d\u7f6e&#xff0c;\u8be5\u5de5\u5177\u80fd\u591f\u9ad8\u6548\u5730\u68c0\u6d4b\u76ee\u6807\u670d\u52a1\u5668\u7684\u76d1\u542c\u72b6\u6001\u3002\u5b83\u5728\u7f51\u7edc\u7ba1\u7406\u3001\u5b89\u5168\u68c0\u6d4b\u548c\u81ea\u52a8\u5316\u6d4b\u8bd5\u4e2d\u5177\u6709\u5e7f\u6cdb\u7684\u5e94\u7528\u4ef7\u503c\u3002<\/p>\n<p>Welcome to follow WeChat official 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