{"id":9025,"date":"2025-04-18T17:07:56","date_gmt":"2025-04-18T09:07:56","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/9025.html"},"modified":"2025-04-18T17:07:56","modified_gmt":"2025-04-18T09:07:56","slug":"%e3%80%90c%e9%ab%98%e5%b9%b6%e5%8f%91%e6%9c%8d%e5%8a%a1%e5%99%a8webserver%e3%80%91-13%ef%bc%9a%e5%a4%9a%e7%ba%bf%e7%a8%8b%e6%9c%8d%e5%8a%a1%e5%99%a8%e5%bc%80%e5%8f%91","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/9025.html","title":{"rendered":"\u3010C++\u9ad8\u5e76\u53d1\u670d\u52a1\u5668WebServer\u3011-13\uff1a\u591a\u7ebf\u7a0b\u670d\u52a1\u5668\u5f00\u53d1"},"content":{"rendered":"<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250418090754-6802166a405a7.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/> <\/p>\n<h4>\u672c\u6587\u76ee\u5f55<\/h4>\n<ul>\n<li>\u4e00\u3001\u591a\u7ebf\u7a0b\u670d\u52a1\u5668\u5f00\u53d1<\/li>\n<li>\u4e8c\u3001TCP\u72b6\u6001\u8f6c\u6362<\/li>\n<li>\u4e09\u3001\u7aef\u53e3\u590d\u7528<\/li>\n<\/ul>\n<h2>\u4e00\u3001\u591a\u7ebf\u7a0b\u670d\u52a1\u5668\u5f00\u53d1<\/h2>\n<p>\u670d\u52a1\u7aef\u4ee3\u7801\u5982\u4e0b\u3002<\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;stdio.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;arpa\/inet.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;unistd.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;stdlib.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;string.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;pthread.h&gt;<\/span><\/span><\/p>\n<p><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockInfo<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> fd<span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u901a\u4fe1\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26<\/span><br \/>\n    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr_in<\/span> addr<span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/\u5ba2\u6237\u7aef\u7684\u4fe1\u606f<\/span><br \/>\n    pthread_t tid<span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u7ebf\u7a0b\u53f7<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u5148\u5b9a\u4e49\u597d\u80fd\u591f\u540c\u65f6\u652f\u6301\u7684\u5ba2\u6237\u7aef\u6570\u91cf<\/span><br \/>\n<span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockInfo<\/span> sockinfos<span class=\"token punctuation\">[<\/span><span class=\"token number\">128<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">void<\/span> <span class=\"token operator\">*<\/span> <span class=\"token function\">working<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">void<\/span> <span class=\"token operator\">*<\/span> arg<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u5b50\u7ebf\u7a0b\u548c\u5ba2\u6237\u7aef\u901a\u4fe1   cfd \u5ba2\u6237\u7aef\u7684\u4fe1\u606f \u7ebf\u7a0b\u53f7<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u83b7\u53d6\u5ba2\u6237\u7aef\u7684\u4fe1\u606f<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u53c2\u6570\u662fvoid * \u7c7b\u578b\u7684&#xff0c;\u6240\u4ee5\u9700\u8981\u8fdb\u884c\u5f3a\u8f6c<\/span><br \/>\n    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockInfo<\/span> <span class=\"token operator\">*<\/span> pinfo <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockInfo<\/span> <span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span>arg<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">char<\/span> cliIp<span class=\"token punctuation\">[<\/span><span class=\"token number\">16<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">inet_ntop<\/span><span class=\"token punctuation\">(<\/span>AF_INET<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>pinfo<span class=\"token operator\">-&gt;<\/span>addr<span class=\"token punctuation\">.<\/span>sin_addr<span class=\"token punctuation\">.<\/span>s_addr<span class=\"token punctuation\">,<\/span> cliIp<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>cliIp<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">short<\/span> cliPort <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">ntohs<\/span><span class=\"token punctuation\">(<\/span>pinfo<span class=\"token operator\">-&gt;<\/span>addr<span class=\"token punctuation\">.<\/span>sin_port<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;client ip is : %s, prot is %d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> cliIp<span class=\"token punctuation\">,<\/span> cliPort<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u63a5\u6536\u5ba2\u6237\u7aef\u53d1\u6765\u7684\u6570\u636e<\/span><br \/>\n    <span class=\"token keyword\">char<\/span> recvBuf<span class=\"token punctuation\">[<\/span><span class=\"token number\">1024<\/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 number\">1<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> len <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">read<\/span><span class=\"token punctuation\">(<\/span>pinfo<span class=\"token operator\">-&gt;<\/span>fd<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>recvBuf<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>recvBuf<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>len <span class=\"token operator\">&#061;&#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 function\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;read&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token function\">exit<\/span><span class=\"token punctuation\">(<\/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 punctuation\">}<\/span><span class=\"token keyword\">else<\/span> <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>len <span class=\"token operator\">&gt;<\/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;recv client : %s\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> recvBuf<span class=\"token punctuation\">)<\/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>len <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;client closed&#8230;.\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token function\">write<\/span><span class=\"token punctuation\">(<\/span>pinfo<span class=\"token operator\">-&gt;<\/span>fd<span class=\"token punctuation\">,<\/span> recvBuf<span class=\"token punctuation\">,<\/span> <span class=\"token function\">strlen<\/span><span class=\"token punctuation\">(<\/span>recvBuf<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>pinfo<span class=\"token operator\">-&gt;<\/span>fd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u521b\u5efasocket<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> lfd <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">socket<\/span><span class=\"token punctuation\">(<\/span>PF_INET<span class=\"token punctuation\">,<\/span> SOCK_STREAM<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 keyword\">if<\/span><span class=\"token punctuation\">(<\/span>lfd <span class=\"token operator\">&#061;&#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 function\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;socket&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">exit<\/span><span class=\"token punctuation\">(<\/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 punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr_in<\/span> saddr<span class=\"token punctuation\">;<\/span><br \/>\n    saddr<span class=\"token punctuation\">.<\/span>sin_family <span class=\"token operator\">&#061;<\/span> AF_INET<span class=\"token punctuation\">;<\/span><br \/>\n    saddr<span class=\"token punctuation\">.<\/span>sin_port <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">htons<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">9999<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    saddr<span class=\"token punctuation\">.<\/span>sin_addr<span class=\"token punctuation\">.<\/span>s_addr <span class=\"token operator\">&#061;<\/span> INADDR_ANY<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u7ed1\u5b9a<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> ret <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">bind<\/span><span class=\"token punctuation\">(<\/span>lfd<span class=\"token punctuation\">,<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr<\/span> <span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">&amp;<\/span>saddr<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>saddr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>ret <span class=\"token operator\">&#061;&#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 function\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;bind&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">exit<\/span><span class=\"token punctuation\">(<\/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 punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u76d1\u542c<\/span><br \/>\n    ret <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">listen<\/span><span class=\"token punctuation\">(<\/span>lfd<span class=\"token punctuation\">,<\/span> <span class=\"token number\">128<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>ret <span class=\"token operator\">&#061;&#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 function\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;listen&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">exit<\/span><span class=\"token punctuation\">(<\/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 punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u521d\u59cb\u5316\u6570\u636e&#xff0c;\u7528\u6574\u4e2a\u6570\u7ec4\u7684\u6240\u5360\u5b57\u8282\u9664\u4ee5\u5355\u4e2a\u5143\u7d20\u7684\u5927\u5c0f&#xff0c;\u5f97\u5230\u6570\u7ec4\u4e2d\u7684\u603b\u6570<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> max <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>sockinfos<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">\/<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>sockinfos<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\">for<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> max<span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/\u5c06sockinfos[i]\u8fd9\u4e2a\u5730\u5740\u4e2d\u7684\u6240\u6709\u5185\u5b58\u5927\u5c0f\u90fd\u7f6e\u4e3a0<\/span><br \/>\n        <span class=\"token function\">bzero<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>sockinfos<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>sockinfos<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        sockinfos<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>fd <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 comment\">\/\/-1\u8868\u793a\u662f\u53ef\u7528\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26<\/span><br \/>\n        sockinfos<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>tid <span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u5faa\u73af\u7b49\u5f85\u5ba2\u6237\u7aef\u8fde\u63a5&#xff0c;\u4e00\u65e6\u4e00\u4e2a\u5ba2\u6237\u7aef\u8fde\u63a5\u8fdb\u6765&#xff0c;\u5c31\u521b\u5efa\u4e00\u4e2a\u5b50\u7ebf\u7a0b\u8fdb\u884c\u901a\u4fe1<\/span><br \/>\n    <span class=\"token keyword\">while<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><\/p>\n<p>        <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr_in<\/span> cliaddr<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> len <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>cliaddr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u63a5\u53d7\u8fde\u63a5<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> cfd <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">accept<\/span><span class=\"token punctuation\">(<\/span>lfd<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr<\/span><span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">&amp;<\/span>cliaddr<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>len<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u5c40\u90e8\u53d8\u91cf\u5f53\u5faa\u73af\u7ed3\u675f&#xff0c;\u5c31\u4f1a\u91ca\u653e&#xff0c;\u6240\u4ee5\u53ef\u4ee5\u901a\u8fc7\u5806malloc\u6765\u4fdd\u5b58\u6570\u636e&#xff0c;\u4f46\u662f\u5b50\u7ebf\u7a0b\u9700\u8981\u5bf9\u5e94\u7684\u53bb\u91ca\u653e\u8fd9\u4e2a\u5806<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u5b9a\u4e49\u597d\u7ed3\u6784\u4f53\u6307\u9488<\/span><br \/>\n        <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockInfo<\/span> <span class=\"token operator\">*<\/span> pinfo<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">for<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> max<span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token comment\">\/\/ \u4ece\u8fd9\u4e2a\u6570\u7ec4\u4e2d\u627e\u5230\u4e00\u4e2a\u53ef\u4ee5\u7528\u7684sockInfo\u5143\u7d20<\/span><br \/>\n            <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>sockinfos<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>fd <span class=\"token operator\">&#061;&#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                pinfo <span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">&amp;<\/span>sockinfos<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n            <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>i <span class=\"token operator\">&#061;&#061;<\/span> max <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 comment\">\/\/\u4e5f\u5c31\u662fi&#061;127\u7684\u65f6\u5019&#xff0c;sleep1\u79d2&#xff0c;\u4e0d\u7136\u4f1a\u7ee7\u7eed\u4e0b\u53bb\u521b\u5efa\u5b50\u7ebf\u7a0b\u4e86<\/span><br \/>\n                <span class=\"token function\">sleep<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token comment\">\/\/ i&#8211;;<\/span><br \/>\n                i <span class=\"token operator\">&#061;<\/span>  <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        pinfo<span class=\"token operator\">-&gt;<\/span>fd <span class=\"token operator\">&#061;<\/span> cfd<span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/\u4e0d\u53ef\u4ee5\u7528pinfo.addr &#061; cliaddr\u8fdb\u884c\u8d4b\u503c&#xff0c;\u53ef\u4ee5\u901a\u8fc7\u91cc\u9762\u5bf9\u5e94\u7684\u5143\u7d20\u8fdb\u884c\u8d4b\u503c<\/span><br \/>\n        <span class=\"token function\">memcpy<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>pinfo<span class=\"token operator\">-&gt;<\/span>addr<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>cliaddr<span class=\"token punctuation\">,<\/span> len<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u521b\u5efa\u5b50\u7ebf\u7a0b&#xff0c;\u7b2c\u56db\u4e2a\u53c2\u6570\u662f\u5b50\u7ebf\u7a0b\u9700\u8981\u7684\u53c2\u6570&#xff0c;\u4e14\u7c7b\u578b\u662f (void *) \u7c7b\u578b&#xff0c;\u4f46\u662f\u9700\u8981cfd\u3001\u5ba2\u6237\u7aef\u4fe1\u606f\u3001\u7ebf\u7a0b\u53f7<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u6240\u4ee5\u53ef\u628a\u9700\u8981\u7684\u53c2\u6570\u5c01\u88c5\u6210\u4e00\u4e2a\u7ed3\u6784\u4f53&#xff0c;\u7136\u540e\u628a\u7ed3\u6784\u4f53\u4f20\u8fdb\u53bb&#xff0c;\u8fd9\u91cc\u5c31\u662f\u7b2c\u56db\u4e2a\u53c2\u6570pinfo<\/span><br \/>\n        <span class=\"token comment\">\/\/ pthread_t tid\u5f97\u7b49\u5230pthread_create\u4e4b\u540e\u624d\u4f1a\u6709\u5bf9\u5e94\u7684\u503c&#xff0c;\u6240\u4ee5\u53ef\u4ee5\u76f4\u63a5\u7528&amp;pinfo-&gt;tid\u6765\u4ee3\u66ff&#xff0c;\u8fd9\u6837\u53ef\u4ee5\u76f4\u63a5\u7ed9\u7ed3\u6784\u4f53\u4e2d\u7684tid\u8fdb\u884c\u8d4b\u503c<\/span><br \/>\n        <span class=\"token function\">pthread_create<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>pinfo<span class=\"token operator\">-&gt;<\/span>tid<span class=\"token punctuation\">,<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">,<\/span> working<span class=\"token punctuation\">,<\/span> pinfo<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token comment\">\/\/ void* \u7c7b\u578b\u7684\u6307\u9488\u662f\u4e00\u79cd\u7279\u6b8a\u7684\u6307\u9488\u7c7b\u578b&#xff0c;\u53ef\u4ee5\u6307\u5411\u4efb\u4f55\u7c7b\u578b\u7684\u5bf9\u8c61\u3002<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u4e5f\u5c31\u662f\u53ef\u4ee5\u5b58\u50a8\u4efb\u4f55\u7c7b\u578b\u7684\u6307\u9488\u503c&#xff0c;\u4f46\u662f\u4e0d\u80fd\u76f4\u63a5\u5bf9\u4ed6\u8fdb\u884c\u89e3\u5f15\u7528\u64cd\u4f5c\u3002<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u5728\u8fdb\u884c\u4f7f\u7528\u7684\u65f6\u5019&#xff0c;\u5fc5\u987b\u8fdb\u884c\u5f3a\u8f6c&#xff0c;\u5c06\u5176\u8f6c\u6362\u4e3a\u6b63\u786e\u7684\u7c7b\u578b\u3002<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u4e0d\u53ef\u4ee5\u7528pthread_join();\u56e0\u4e3a\u662f\u963b\u585e\u7684&#xff0c;\u8fd9\u6837\u5c31\u4e0d\u80fd\u7b49\u5f85\u4e0b\u4e00\u4e2a\u5ba2\u6237\u7aef\u8fdb\u6765\u5faa\u73af\u4e86\u3002<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u8bbe\u7f6e\u7ebf\u7a0b\u5206\u79bb&#xff0c;\u8ba9\u5f53\u524d\u7ebf\u7a0b\u7ed3\u675f\u4e4b\u540e\u81ea\u5df1\u53bb\u91ca\u653e\u8d44\u6e90&#xff0c;\u4e0d\u9700\u8981\u7236\u7ebf\u7a0b\u56de\u6536\u3002<\/span><br \/>\n        <span class=\"token function\">pthread_detach<\/span><span class=\"token punctuation\">(<\/span>pinfo<span class=\"token operator\">-&gt;<\/span>tid<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>lfd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/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 punctuation\">}<\/span><\/p>\n<p>\u5ba2\u6237\u7aef\u4ee3\u7801\u5982\u4e0b&#xff1a;<\/p>\n<p><span class=\"token comment\">\/\/ TCP\u901a\u4fe1\u7684\u5ba2\u6237\u7aef<\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;stdio.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;arpa\/inet.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;unistd.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;string.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;stdlib.h&gt;<\/span><\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ 1.\u521b\u5efa\u5957\u63a5\u5b57<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> fd <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">socket<\/span><span class=\"token punctuation\">(<\/span>AF_INET<span class=\"token punctuation\">,<\/span> SOCK_STREAM<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 keyword\">if<\/span><span class=\"token punctuation\">(<\/span>fd <span class=\"token operator\">&#061;&#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 function\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;socket&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">exit<\/span><span class=\"token punctuation\">(<\/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 punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ 2.\u8fde\u63a5\u670d\u52a1\u5668\u7aef<\/span><br \/>\n    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr_in<\/span> serveraddr<span class=\"token punctuation\">;<\/span><br \/>\n    serveraddr<span class=\"token punctuation\">.<\/span>sin_family <span class=\"token operator\">&#061;<\/span> AF_INET<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">inet_pton<\/span><span class=\"token punctuation\">(<\/span>AF_INET<span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;127.0.0.1&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>serveraddr<span class=\"token punctuation\">.<\/span>sin_addr<span class=\"token punctuation\">.<\/span>s_addr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    serveraddr<span class=\"token punctuation\">.<\/span>sin_port <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">htons<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">9999<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> ret <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">connect<\/span><span class=\"token punctuation\">(<\/span>fd<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr<\/span> <span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">&amp;<\/span>serveraddr<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>serveraddr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>ret <span class=\"token operator\">&#061;&#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 function\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;connect&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">exit<\/span><span class=\"token punctuation\">(<\/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 punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ 3. \u901a\u4fe1<\/span><br \/>\n    <span class=\"token keyword\">char<\/span> recvBuf<span class=\"token punctuation\">[<\/span><span class=\"token number\">1024<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">while<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><\/p>\n<p>        <span class=\"token function\">sprintf<\/span><span class=\"token punctuation\">(<\/span>recvBuf<span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;data : %d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u7ed9\u670d\u52a1\u5668\u7aef\u53d1\u9001\u6570\u636e<\/span><br \/>\n        <span class=\"token comment\">\/\/\u8fd9\u91cc&#043;1 \u662f\u56e0\u4e3a\u8981\u7b97\u8fdb\u53bb\u5b57\u7b26\u6362\u884c\u7684\u7ed3\u675f\u7b26&#xff0c;\u4e0d\u7136\u4f1a\u6709\u95ee\u9898\u3002<\/span><br \/>\n        <span class=\"token function\">write<\/span><span class=\"token punctuation\">(<\/span>fd<span class=\"token punctuation\">,<\/span> recvBuf<span class=\"token punctuation\">,<\/span> <span class=\"token function\">strlen<\/span><span class=\"token punctuation\">(<\/span>recvBuf<span class=\"token punctuation\">)<\/span><span class=\"token operator\">&#043;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token keyword\">int<\/span> len <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">read<\/span><span class=\"token punctuation\">(<\/span>fd<span class=\"token punctuation\">,<\/span> recvBuf<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>recvBuf<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>len <span class=\"token operator\">&#061;&#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 function\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;read&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token function\">exit<\/span><span class=\"token punctuation\">(<\/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 punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>len <span class=\"token operator\">&gt;<\/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;recv server : %s\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> recvBuf<span class=\"token punctuation\">)<\/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>len <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 comment\">\/\/ \u8868\u793a\u670d\u52a1\u5668\u7aef\u65ad\u5f00\u8fde\u63a5<\/span><br \/>\n            <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;server closed&#8230;&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token function\">sleep<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u5173\u95ed\u8fde\u63a5<\/span><br \/>\n    <span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>fd<span class=\"token punctuation\">)<\/span><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>\u8fd0\u884c\u4e0b\u9762\u4ee3\u7801\u53ef\u4ee5\u770b\u5230\u6548\u679c\u5982\u56fe&#xff1a;<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250418090754-6802166a7f4b7.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h2>\u4e8c\u3001TCP\u72b6\u6001\u8f6c\u6362<\/h2>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250418090754-6802166abac16.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/> \u4e3b\u52a8\u65ad\u5f00\u8fde\u63a5\u7684\u4e00\u65b9&#xff0c;\u6700\u540e\u8fdb\u5165\u4e00\u4e2aTIME_WAIT\u72b6\u6001&#xff0c;\u8fd9\u4e2a\u72b6\u6001\u662f\u5b9a\u65f6\u7ecf\u8fc7\u4e24\u4e2a\u62a5\u6587\u6bb5\u5bff\u547d&#xff08;2MSL&#xff0c;Maximum Segment Lifetime&#xff09;\u4e4b\u540e\u624d\u4f1a\u7ed3\u675f\u3002<\/p>\n<p>\u8fd9\u91cc\u9700\u8981\u641e\u6e05\u695a\u4e00\u4e2a\u70b9&#xff0c;\u5047\u8bbe\u5ba2\u6237\u7aef\u4e3b\u52a8\u65ad\u5f00\u8fde\u63a5&#xff0c;\u5f53\u5ba2\u6237\u7aef\u53d1\u9001FIN\u62a5\u6587\u4e4b\u540e&#xff0c;\u670d\u52a1\u7aef\u56de\u4e00\u4e2aACK&#xff0c;\u7136\u540e\u5ba2\u6237\u7aef\u4f1a\u8fdb\u5165FIN_WAIT_2\u72b6\u6001&#xff0c;\u8fd9\u4e2a\u65f6\u5019\u670d\u52a1\u7aef\u53ef\u4ee5\u7ee7\u7eed\u5411\u5ba2\u6237\u7aef\u53d1\u9001\u6570\u636e&#xff0c;\u76f4\u5230\u53d1\u9001\u5b8c\u8be5\u53d1\u9001\u7684\u6570\u636e\u4e4b\u540e&#xff0c;\u624d\u4f1a\u5411\u5ba2\u6237\u7aef\u53d1\u9001FIN\u62a5\u6587&#xff0c;\u7136\u540e\u5ba2\u6237\u7aef\u4f1a\u8fdb\u5165TIME_WAIT\u72b6\u6001&#xff0c;\u4ece\u800c\u7ecf\u8fc72MSL\u65ad\u5f00\u3002<\/p>\n<p>\u8fd9\u4e5f\u5c31\u662f\u4e3a\u4ec0\u4e48\u662f\u56db\u6b21\u6325\u624b&#xff0c;\u800c\u4e0d\u662f\u50cf\u4e09\u6b21\u63e1\u624b\u4e00\u6837&#xff0c;\u628aACK\u548cFIN\u7ed3\u5408\u8d77\u6765\u4ece\u800c\u6574\u4f53\u53d8\u6210\u4e09\u6b21\u6325\u624b\u3002\u4e09\u6b21\u63e1\u624b\u7684\u65f6\u5019\u662f\u56e0\u4e3a\u53cc\u65b9\u90fd\u5e0c\u671b\u80fd\u591f\u5efa\u7acb\u8fde\u63a5&#xff0c;\u6240\u4ee5ACK\u548cSYN\u53ef\u4ee5\u7ed3\u5408\u3002\u4f46\u662f\u65ad\u5f00\u8fde\u63a5\u53ef\u80fd\u4f1a\u6709\u67d0\u4e00\u65b9\u201c\u4e0d\u613f\u610f\u201d&#xff0c;\u8fd8\u6709\u9700\u8981\u53d1\u9001\u7684\u4e00\u4e2a\u6570\u636e\u3002\u53ef\u4ee5\u7406\u89e3\u6210\u5355\u65b9\u9762\u7684\u6982\u5ff5\u3002<\/p>\n<p>2MSL\u662f\u4e3a\u4e86\u4fdd\u8bc1\u5b89\u5168\u548c\u53ef\u9760\u6027&#xff0c;\u56e0\u4e3a\u6709\u53ef\u80fd\u5ba2\u6237\u7aef\u56de\u7684\u6700\u540e\u4e00\u4e2aACK\u53ef\u80fd\u670d\u52a1\u7aef\u4f1a\u6ca1\u6536\u5230&#xff0c;\u5982\u679c\u5ba2\u6237\u7aef\u7acb\u9a6c\u65ad\u5f00&#xff0c;\u90a3\u4e48\u670d\u52a1\u7aef\u4f1a\u6ca1\u65ad\u5f00&#xff0c;\u90a3\u4e48\u7ed3\u675f\u7684\u72b6\u6001\u662f\u4e0d\u5b8c\u6574\u7684\u3002\u6ca1\u6709\u63a5\u6536\u5230ACK&#xff0c;\u90a3\u4e48\u670d\u52a1\u7aef\u4f1a\u518d\u6b21\u53d1\u9001\u4e00\u4e2aFIN&#xff0c;\u7136\u540e\u5ba2\u6237\u7aef\u518d\u53d1\u4e00\u6b21ACK\u3002<\/p>\n<p>2MSL\u5c31\u662f\u786e\u4fdd\u53e6\u5916\u4e00\u65b9\u80fd\u591f\u63a5\u6536\u5230ACK\u3002Linux\u4e2dmsl\u4e00\u822c\u662f30s\u3002<\/p>\n<p>\u5f53 TCP \u8fde\u63a5\u4e3b\u52a8\u5173\u95ed\u65b9\u63a5\u6536\u5230\u88ab\u52a8\u5173\u95ed\u65b9\u53d1\u9001\u7684 FIN \u548c\u6700\u7ec8\u7684 ACK\u540e&#xff0c;\u8fde\u63a5\u7684\u4e3b\u52a8\u5173\u95ed\u65b9\u5fc5\u987b\u5904\u4e8eTIME_WAIT \u72b6\u6001\u5e76\u6301\u7eed 2MSL \u65f6\u95f4\u3002\u8fd9\u6837\u5c31\u80fd\u591f\u8ba9 TCP \u8fde\u63a5\u7684\u4e3b\u52a8\u5173\u95ed\u65b9\u5728\u5b83\u53d1\u9001\u7684 ACK \u4e22\u5931\u7684\u60c5\u51b5\u4e0b\u91cd\u65b0\u53d1\u9001\u6700\u7ec8\u7684 ACK\u3002\u4e3b\u52a8\u5173\u95ed\u65b9\u91cd\u65b0\u53d1\u9001\u7684\u6700\u7ec8 ACK \u5e76\u4e0d\u662f\u56e0\u4e3a\u88ab\u52a8\u5173\u95ed\u65b9\u91cd\u4f20\u4e86 ACK(\u5b83\u4eec\u5e76\u4e0d\u6d88\u8017\u5e8f\u5217\u53f7\u88ab\u52a8\u5173\u95ed\u65b9\u4e5f\u4e0d\u4f1a\u91cd\u4f20)&#xff0c;\u800c\u662f\u56e0\u4e3a\u88ab\u52a8\u5173\u95ed\u65b9\u91cd\u4f20\u4e86\u5b83\u7684FIN\u3002\u4e8b\u5b9e\u4e0a&#xff0c;\u88ab\u52a8\u5173\u95ed\u65b9\u603b\u662f\u91cd\u4f20 FIN \u76f4\u5230\u5b83\u6536\u5230\u4e00\u4e2a\u6700\u7ec8\u7684 ACK\u3002<\/p>\n<p>\u6709\u4e9b\u7a0b\u5e8f\u5c31\u662f\u6709\u5355\u65b9\u5411\u53d1\u9001\u7684\u9700\u6c42&#xff0c;\u6240\u4ee5\u53ef\u4ee5\u7528\u534a\u5173\u95ed\u72b6\u6001\u3002<\/p>\n<p>\u5f53 TCP \u94fe\u63a5\u4e2dA \u5411B\u53d1\u9001 FIN \u8bf7\u6c42\u5173\u95ed&#xff0c;\u53e6\u4e00\u7aef B \u56de\u5e94 ACK \u4e4b\u540e(A \u7aef\u8fdb\u5165 FIN WAIT 2\u72b6\u6001)&#xff0c;\u5e76\u6ca1\u6709\u7acb\u5373\u53d1\u9001 FIN \u7ed9 A&#xff0c;A\u65b9\u5904\u4e8e\u534a\u8fde\u63a5\u72b6\u6001(\u534a\u5f00\u5173)&#xff0c;\u6b64\u65f6A\u53ef\u4ee5\u63a5\u6536B\u53d1\u9001\u7684\u6570\u636e&#xff0c;\u4f46\u662f A\u5df2\u7ecf\u4e0d\u80fd\u518d\u5411B\u53d1\u9001\u6570\u636e\u3002<\/p>\n<p>\u53ef\u4ee5\u901a\u8fc7API\u6765\u5b9e\u73b0\u534a\u8fde\u63a5\u534a\u5173\u95ed\u72b6\u6001\u3002<\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;sys\/socket.h&gt;<\/span><\/span><br \/>\n<span class=\"token keyword\">int<\/span> <span class=\"token function\">shutdown<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> sockfd<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> how<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>sockfd: \u9700\u8981\u5173\u95ed\u7684socket\u7684\u63cf\u8ff0\u7b26\u3002<\/p>\n<p>how: \u5141\u8bb8\u4e3ashutdown\u64cd\u4f5c\u9009\u62e9\u4ee5\u4e0b\u51e0\u79cd\u65b9\u5f0f&#xff1a; SHUT_RD(0)&#xff1a; \u5173\u95edsockfd\u4e0a\u7684\u8bfb\u529f\u80fd&#xff0c;\u6b64\u9009\u9879\u5c06\u4e0d\u5141\u8bb8sockfd\u8fdb\u884c\u8bfb\u64cd\u4f5c\u3002\u8be5\u5957\u63a5\u5b57\u4e0d\u518d\u63a5\u6536\u6570\u636e&#xff0c;\u4efb\u4f55\u5f53\u524d\u5728\u5957\u63a5\u5b57\u63a5\u53d7\u7f13\u51b2\u533a\u7684\u6570\u636e\u5c06\u88ab\u65e0\u58f0\u7684\u4e22\u5f03\u6389\u3002 SHUT_WR(1): \u5173\u95edsockfd\u7684\u5199\u529f\u80fd&#xff0c;\u6b64\u9009\u9879\u5c06\u4e0d\u5141\u8bb8sockfd\u8fdb\u884c\u5199\u64cd\u4f5c\u3002\u8fdb\u7a0b\u4e0d\u80fd\u5728\u5bf9\u6b64\u5957\u63a5\u5b57\u53d1\u51fa\u5199\u64cd\u4f5c\u3002 SHUT_RDWR(2):\u5173\u95edsockfd\u7684\u8bfb\u5199\u529f\u80fd\u3002\u76f8\u5f53\u4e8e\u8c03\u7528shutdown\u4e24\u6b21&#xff1a;\u9996\u5148\u662f\u4ee5SHUT_RD&#xff0c;\u7136\u540e\u662fSHUT_WR\u3002<\/p>\n<p>\u4f7f\u7528 close \u4e2d\u6b62\u4e00\u4e2a\u8fde\u63a5&#xff0c;\u4f46\u5b83\u53ea\u662f\u51cf\u5c11\u63cf\u8ff0\u7b26\u7684\u5f15\u7528\u8ba1\u6570&#xff0c;\u5e76\u4e0d\u76f4\u63a5\u5173\u95ed\u8fde\u63a5&#xff0c;\u53ea\u6709\u5f53\u63cf\u8ff0\u7b26\u7684\u5f15\u7528\u8ba1\u6570\u4e3a0\u65f6\u624d\u5173\u95ed\u8fde\u63a5\u3002shutdown \u4e0d\u8003\u8651\u63cf\u8ff0\u7b26\u7684\u5f15\u7528\u8ba1\u6570&#xff0c;\u76f4\u63a5\u5173\u95ed\u63cf\u8ff0\u7b26\u3002\u4e5f\u53ef\u9009\u62e9\u4e2d\u6b62\u4e00\u4e2a\u65b9\u5411\u7684\u8fde\u63a5&#xff0c;\u53ea\u4e2d\u6b62\u8bfb\u6216\u53ea\u4e2d\u6b62\u5199\u3002&#xff08;\u5728\u4f7f\u7528 fork \u65f6&#xff0c;\u5b50\u8fdb\u7a0b\u4f1a\u7ee7\u627f\u7236\u8fdb\u7a0b\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26&#xff0c;\u56e0\u6b64\u9700\u8981\u5728\u7236\u5b50\u8fdb\u7a0b\u4e2d\u5206\u522b\u5173\u95ed\u4e0d\u9700\u8981\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26&#xff0c;\u4ee5\u907f\u514d\u8d44\u6e90\u6cc4\u6f0f\u3002&#xff09;<\/p>\n<p>\u5982\u679c\u6709\u591a\u4e2a\u8fdb\u7a0b\u5171\u4eab\u4e00\u4e2a\u5957\u63a5\u5b57&#xff0c;close \u6bcf\u88ab\u8c03\u7528\u4e00\u6b21&#xff0c;\u8ba1\u6570\u51cf1&#xff0c;\u76f4\u5230\u8ba1\u6570\u4e3a0\u65f6&#xff0c;\u4e5f\u5c31\u662f\u6240\u7528\u8fdb\u7a0b\u90fd\u8c03\u7528\u4e86 close&#xff0c;\u5957\u63a5\u5b57\u5c06\u88ab\u91ca\u653e\u3002<\/p>\n<p>\u5728\u591a\u8fdb\u7a0b\u4e2d\u5982\u679c\u4e00\u4e2a\u8fdb\u7a0b\u8c03\u7528\u4e86 shutdown(sfd,SHUT_RDWR)\u540e&#xff0c;\u5176\u5b83\u7684\u8fdb\u7a0b\u5c06\u65e0\u6cd5\u8fdb\u884c\u901a\u4fe1\u3002\u4f46\u5982\u679c\u4e00\u4e2a\u8fdb\u7a0b close(sfd)\u5c06\u4e0d\u4f1a\u5f71\u54cd\u5230\u5176\u5b83\u8fdb\u7a0b\u3002<\/p>\n<h2>\u4e09\u3001\u7aef\u53e3\u590d\u7528<\/h2>\n<p>\u5728Linux\u4e2d&#xff0c;\u6709\u4e00\u4e9b\u67e5\u770b\u7f51\u7edc\u76f8\u5173\u4fe1\u606f\u7684\u547d\u4ee4\u3002<\/p>\n<p>netstat<span class=\"token operator\">:<\/span><br \/>\nnetstat <span class=\"token operator\">&#8211;<\/span>a <span class=\"token operator\">:<\/span>\u663e\u793a\u6240\u6709\u7684socket<br \/>\nnetstat <span class=\"token operator\">&#8211;<\/span>p <span class=\"token operator\">:<\/span>\u663e\u793a\u6b63\u5728\u4f7f\u7528socket\u7684\u7a0b\u5e8f\u7684\u540d\u79f0<br \/>\nnetstat <span class=\"token operator\">&#8211;<\/span>n <span class=\"token operator\">:<\/span>\u76f4\u63a5\u4f7f\u7528IP\u5730\u5740&#xff0c;\u800c\u4e0d\u901a\u8fc7\u57df\u540d\u670d\u52a1\u5668<br \/>\nnetstat <span class=\"token operator\">&#8211;<\/span>t <span class=\"token operator\">:<\/span>\u663e\u793aTCP\u7684socket<br \/>\nnetstat <span class=\"token operator\">&#8211;<\/span>u <span class=\"token operator\">:<\/span>\u663e\u793aUDP\u7684socket<\/p>\n<p>\u9996\u5148\u8fd0\u884c\u4e0b\u9762\u7684server \u4ee3\u7801\u3002<\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;stdio.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;ctype.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;arpa\/inet.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;unistd.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;stdlib.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;string.h&gt;<\/span><\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> <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> <span class=\"token punctuation\">{<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u521b\u5efasocket<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> lfd <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">socket<\/span><span class=\"token punctuation\">(<\/span>PF_INET<span class=\"token punctuation\">,<\/span> SOCK_STREAM<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>lfd <span class=\"token operator\">&#061;&#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 function\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;socket&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/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\">sockaddr_in<\/span> saddr<span class=\"token punctuation\">;<\/span><br \/>\n    saddr<span class=\"token punctuation\">.<\/span>sin_family <span class=\"token operator\">&#061;<\/span> AF_INET<span class=\"token punctuation\">;<\/span><br \/>\n    saddr<span class=\"token punctuation\">.<\/span>sin_addr<span class=\"token punctuation\">.<\/span>s_addr <span class=\"token operator\">&#061;<\/span> INADDR_ANY<span class=\"token punctuation\">;<\/span><br \/>\n    saddr<span class=\"token punctuation\">.<\/span>sin_port <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">htons<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">9999<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/int optval &#061; 1;<\/span><br \/>\n    <span class=\"token comment\">\/\/setsockopt(lfd, SOL_SOCKET, SO_REUSEADDR, &amp;optval, sizeof(optval));<\/span><br \/>\n     <span class=\"token comment\">\/\/int optval &#061; 1;<\/span><br \/>\n    <span class=\"token comment\">\/\/setsockopt(lfd, SOL_SOCKET, SO_REUSEPORT, &amp;optval, sizeof(optval));<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u7ed1\u5b9a<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> ret <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">bind<\/span><span class=\"token punctuation\">(<\/span>lfd<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr<\/span> <span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">&amp;<\/span>saddr<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>saddr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>ret <span class=\"token operator\">&#061;&#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 function\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;bind&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u76d1\u542c<\/span><br \/>\n    ret <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">listen<\/span><span class=\"token punctuation\">(<\/span>lfd<span class=\"token punctuation\">,<\/span> <span class=\"token number\">8<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>ret <span class=\"token operator\">&#061;&#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 function\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;listen&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u63a5\u6536\u5ba2\u6237\u7aef\u8fde\u63a5<\/span><br \/>\n    <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr_in<\/span> cliaddr<span class=\"token punctuation\">;<\/span><br \/>\n    socklen_t len <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>cliaddr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> cfd <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">accept<\/span><span class=\"token punctuation\">(<\/span>lfd<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr<\/span> <span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">&amp;<\/span>cliaddr<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>len<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>cfd <span class=\"token operator\">&#061;&#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 function\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;accpet&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u83b7\u53d6\u5ba2\u6237\u7aef\u4fe1\u606f<\/span><br \/>\n    <span class=\"token keyword\">char<\/span> cliIp<span class=\"token punctuation\">[<\/span><span class=\"token number\">16<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">inet_ntop<\/span><span class=\"token punctuation\">(<\/span>AF_INET<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>cliaddr<span class=\"token punctuation\">.<\/span>sin_addr<span class=\"token punctuation\">.<\/span>s_addr<span class=\"token punctuation\">,<\/span> cliIp<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>cliIp<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">short<\/span> cliPort <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">ntohs<\/span><span class=\"token punctuation\">(<\/span>cliaddr<span class=\"token punctuation\">.<\/span>sin_port<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u8f93\u51fa\u5ba2\u6237\u7aef\u7684\u4fe1\u606f<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;client&#039;s ip is %s, and port is %d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> cliIp<span class=\"token punctuation\">,<\/span> cliPort <span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u63a5\u6536\u5ba2\u6237\u7aef\u53d1\u6765\u7684\u6570\u636e<\/span><br \/>\n    <span class=\"token keyword\">char<\/span> recvBuf<span class=\"token punctuation\">[<\/span><span class=\"token number\">1024<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/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 keyword\">while<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> len <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">recv<\/span><span class=\"token punctuation\">(<\/span>cfd<span class=\"token punctuation\">,<\/span> recvBuf<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>recvBuf<span class=\"token punctuation\">)<\/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 keyword\">if<\/span><span class=\"token punctuation\">(<\/span>len <span class=\"token operator\">&#061;&#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 function\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;recv&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> <span class=\"token operator\">&#8211;<\/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 keyword\">if<\/span><span class=\"token punctuation\">(<\/span>len <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;\u5ba2\u6237\u7aef\u5df2\u7ecf\u65ad\u5f00\u8fde\u63a5&#8230;\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">break<\/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>len <span class=\"token operator\">&gt;<\/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;read buf &#061; %s\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> recvBuf<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u5c0f\u5199\u8f6c\u5927\u5199<\/span><br \/>\n        <span class=\"token keyword\">for<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> len<span class=\"token punctuation\">;<\/span> <span class=\"token operator\">&#043;&#043;<\/span>i<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            recvBuf<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">toupper<\/span><span class=\"token punctuation\">(<\/span>recvBuf<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;after buf &#061; %s\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> recvBuf<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u5927\u5199\u5b57\u7b26\u4e32\u53d1\u7ed9\u5ba2\u6237\u7aef<\/span><br \/>\n        ret <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">send<\/span><span class=\"token punctuation\">(<\/span>cfd<span class=\"token punctuation\">,<\/span> recvBuf<span class=\"token punctuation\">,<\/span> <span class=\"token function\">strlen<\/span><span class=\"token punctuation\">(<\/span>recvBuf<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#043;<\/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 keyword\">if<\/span><span class=\"token punctuation\">(<\/span>ret <span class=\"token operator\">&#061;&#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 function\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;send&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/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 function\">close<\/span><span class=\"token punctuation\">(<\/span>cfd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>lfd<span class=\"token punctuation\">)<\/span><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>\u4e0b\u9762\u662fclient\u4ee3\u7801\u3002<\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;stdio.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;arpa\/inet.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;stdlib.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;unistd.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;string.h&gt;<\/span><\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u521b\u5efasocket<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> fd <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">socket<\/span><span class=\"token punctuation\">(<\/span>PF_INET<span class=\"token punctuation\">,<\/span> SOCK_STREAM<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 keyword\">if<\/span><span class=\"token punctuation\">(<\/span>fd <span class=\"token operator\">&#061;&#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 function\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;socket&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/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\">sockaddr_in<\/span> seraddr<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">inet_pton<\/span><span class=\"token punctuation\">(<\/span>AF_INET<span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;127.0.0.1&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>seraddr<span class=\"token punctuation\">.<\/span>sin_addr<span class=\"token punctuation\">.<\/span>s_addr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    seraddr<span class=\"token punctuation\">.<\/span>sin_family <span class=\"token operator\">&#061;<\/span> AF_INET<span class=\"token punctuation\">;<\/span><br \/>\n    seraddr<span class=\"token punctuation\">.<\/span>sin_port <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">htons<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">9999<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u8fde\u63a5\u670d\u52a1\u5668<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> ret <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">connect<\/span><span class=\"token punctuation\">(<\/span>fd<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr<\/span> <span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">&amp;<\/span>seraddr<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>seraddr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>ret <span class=\"token operator\">&#061;&#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 function\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;connect&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">while<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">char<\/span> sendBuf<span class=\"token punctuation\">[<\/span><span class=\"token number\">1024<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/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\">fgets<\/span><span class=\"token punctuation\">(<\/span>sendBuf<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>sendBuf<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token constant\">stdin<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token function\">write<\/span><span class=\"token punctuation\">(<\/span>fd<span class=\"token punctuation\">,<\/span> sendBuf<span class=\"token punctuation\">,<\/span> <span class=\"token function\">strlen<\/span><span class=\"token punctuation\">(<\/span>sendBuf<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u63a5\u6536<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> len <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">read<\/span><span class=\"token punctuation\">(<\/span>fd<span class=\"token punctuation\">,<\/span> sendBuf<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>sendBuf<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>len <span class=\"token operator\">&#061;&#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 function\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;read&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> <span class=\"token operator\">&#8211;<\/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 keyword\">if<\/span><span class=\"token punctuation\">(<\/span>len <span class=\"token operator\">&gt;<\/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;read buf &#061; %s\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> sendBuf<span class=\"token punctuation\">)<\/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 function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u670d\u52a1\u5668\u5df2\u7ecf\u65ad\u5f00\u8fde\u63a5&#8230;\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">break<\/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 function\">close<\/span><span class=\"token punctuation\">(<\/span>fd<span class=\"token punctuation\">)<\/span><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>\u67e5\u770b\u5bf9\u5e94\u7684\u7aef\u53e3\u5360\u7528\u60c5\u51b5&#xff0c;\u53ef\u4ee5\u770b\u5230\u662fserver\u7a0b\u5e8f\u6b63\u5728\u5360\u75289999\u7aef\u53e3\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250418090755-6802166b0b71f.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>\u7136\u540e\u518d\u8fd0\u884c\u5ba2\u6237\u7aef&#xff0c;\u518d\u67e5\u770b\u4e00\u6b21\u60c5\u51b5&#xff0c;\u53ef\u4ee5\u770b\u5230\u4e0b\u9762\u7684\u60c5\u51b5&#xff0c;\u6709\u4e24\u4e2aserver\u3002\u4e00\u4e2aserver\u662f\u7528\u6765\u76d1\u542c\u7684&#xff0c;\u4e00\u4e2aserver\u662f\u7528\u6765\u901a\u4fe1\u7684&#xff08;\u4e5f\u5c31\u662f\u72b6\u6001\u662fEstablished\u7684&#xff09;\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250418090755-6802166b1fd9a.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>\u5f53\u6211\u4eec\u4e3b\u52a8\u65ad\u5f00\u670d\u52a1\u5668\u4e4b\u540e&#xff0c;\u518d\u67e5\u770b\u4e00\u6b21\u72b6\u6001&#xff0c;\u53ef\u4ee5\u770b\u5230\u670d\u52a1\u5668\u7684\u72b6\u6001\u8fd8\u5728&#xff0c;\u4f46\u662f\u4e0d\u4f1a\u663e\u793aserver&#xff0c;\u72b6\u6001\u662fFIN_WAIT2\u3002\u5e76\u4e14client\u7684\u72b6\u6001\u53d8\u6210\u4e86Close_WAIT\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250418090755-6802166b3993b.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/> <img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250418090755-6802166b4f99d.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/> \u7136\u540e\u518d\u8fc7\u4e00\u6bb5\u65f6\u95f4&#xff0c;\u670d\u52a1\u7aef\u7684\u4fe1\u606f\u4e5f\u4f1a\u6ca1\u6709\u4e86\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250418090755-6802166b7457d.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/> \u90a3\u4e48\u7ee7\u7eed\u521a\u521a\u7684\u8fc7\u7a0b&#xff0c;\u8fd0\u884cserver\u548cclient&#xff0c;\u7136\u540e\u9000\u51faserver&#xff0c;\u518d\u7acb\u5373\u542f\u52a8server&#xff0c;\u4f1a\u53d1\u73b0\u663e\u793a\u7aef\u53e3\u5df2\u5360\u7528&#xff0c;\u6b64\u65f6\u67e5\u770bnetstat\u60c5\u51b5&#xff0c;\u4f1a\u53d1\u73b0\u5904\u4e8eFIN_WAIT_2\u7684\u4e00\u4e2a\u72b6\u6001\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250418090755-6802166b8641e.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>\u5982\u679c\u7ee7\u7eed\u9000\u51faclient&#xff0c;\u8fd9\u4e2a\u65f6\u5019server\u4f1a\u4eceFIN_WAIT_2\u53d8\u6210TIME_WAIT\u72b6\u6001&#xff0c;\u7136\u540e\u7b49\u5f852msl\u5c31\u4f1a\u9000\u51fa\u3002<\/p>\n<p>\u8fd9\u4e2a\u65f6\u5019\u5c31\u9700\u8981\u8fdb\u884c\u7aef\u53e3\u590d\u7528\u7684\u8bbe\u7f6e&#xff0c;\u628aserver\u7aef\u4e2d\u7684\u4e0b\u9762\u4e24\u884c\u4ee3\u7801\u7684\u6ce8\u91ca\u53d6\u6d88&#xff0c;\u7136\u540e\u518d\u8fdb\u884c\u5c1d\u8bd5&#xff0c;\u5c31\u53ef\u4ee5\u53d1\u73b0\u4e0d\u4f1a\u663e\u793a\u7aef\u53e3\u7ed1\u5b9a\u4e86\u3002<\/p>\n<p>\u7aef\u53e3\u590d\u7528\u5c31\u662f\u4e3a\u4e86\u89e3\u51b3\u9632\u6b62\u7a0b\u5e8f\u670d\u52a1\u5668\u7a81\u7136\u91cd\u542f\u65f6&#xff0c;\u4e4b\u524d\u7ed1\u5b9a\u7684\u7aef\u53e3\u8fd8\u6ca1\u6709\u91ca\u653e&#xff0c;\u6216\u8005\u7a0b\u5e8f\u7a81\u7136\u9000\u51fa\u4f46\u662f\u6ca1\u6709\u91ca\u653e\u7aef\u53e3\u3002<\/p>\n<p><span class=\"token keyword\">int<\/span> optval <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token function\">setsockopt<\/span><span class=\"token punctuation\">(<\/span>lfd<span class=\"token punctuation\">,<\/span> SOL_SOCKET<span class=\"token punctuation\">,<\/span> SO_REUSEADDR<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>optval<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>optval<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> optval <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token function\">setsockopt<\/span><span class=\"token punctuation\">(<\/span>lfd<span class=\"token punctuation\">,<\/span> SOL_SOCKET<span class=\"token punctuation\">,<\/span> SO_REUSEPORT<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>optval<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>optval<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u6765\u770b\u770b\u4e0b\u9762\u8fd9\u4e2a\u51fd\u6570\u7684\u4f5c\u7528\u3002<\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;sys\/types.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;sys\/socket.h&gt;<\/span><\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u8bbe\u7f6e\u5957\u63a5\u5b57\u7684\u5c5e\u6027&#xff08;\u4e0d\u4ec5\u4ec5\u80fd\u8bbe\u7f6e\u7aef\u53e3\u590d\u7528&#xff09;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> <span class=\"token function\">setsockopt<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> sockfd<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> level<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> optname<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">const<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token operator\">*<\/span>optval<span class=\"token punctuation\">,<\/span> socklen_t<br \/>\noptlen<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>setsockopt \u51fd\u6570\u7528\u4e8e\u8bbe\u7f6e\u5957\u63a5\u5b57\u7684\u9009\u9879&#xff0c;\u5b83\u5141\u8bb8\u7a0b\u5e8f\u5458\u5bf9\u5957\u63a5\u5b57\u7684\u884c\u4e3a\u8fdb\u884c\u7ec6\u7c92\u5ea6\u7684\u63a7\u5236\u3002\u901a\u8fc7\u6307\u5b9a\u6587\u4ef6\u63cf\u8ff0\u7b26 sockfd&#xff0c;\u53ef\u4ee5\u9488\u5bf9\u7279\u5b9a\u7684\u5957\u63a5\u5b57\u8fdb\u884c\u64cd\u4f5c\u3002level \u53c2\u6570\u6307\u5b9a\u4e86\u9009\u9879\u6240\u5728\u7684\u534f\u8bae\u7ea7\u522b&#xff0c;\u4f8b\u5982 SOL_SOCKET \u8868\u793a\u5728\u5957\u63a5\u5b57\u5c42\u9762\u4e0a\u7684\u9009\u9879&#xff0c;\u8fd9\u901a\u5e38\u7528\u4e8e\u8bbe\u7f6e\u901a\u7528\u7684\u5957\u63a5\u5b57\u884c\u4e3a&#xff0c;\u5982\u7aef\u53e3\u590d\u7528\u7b49\u3002optname \u53c2\u6570\u6307\u5b9a\u4e86\u8981\u8bbe\u7f6e\u7684\u5177\u4f53\u9009\u9879\u540d\u79f0&#xff0c;\u6bd4\u5982 SO_REUSEADDR \u6216 SO_REUSEPORT&#xff0c;\u8fd9\u4e9b\u9009\u9879\u5206\u522b\u7528\u4e8e\u63a7\u5236\u5730\u5740\u548c\u7aef\u53e3\u7684\u590d\u7528\u884c\u4e3a&#xff0c;\u5141\u8bb8\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\u591a\u4e2a\u5957\u63a5\u5b57\u7ed1\u5b9a\u5230\u540c\u4e00\u4e2a\u5730\u5740\u548c\u7aef\u53e3&#xff0c;\u8fd9\u5bf9\u4e8e\u63d0\u9ad8\u670d\u52a1\u5668\u7684\u5e76\u53d1\u5904\u7406\u80fd\u529b\u548c\u5feb\u901f\u91cd\u542f\u670d\u52a1\u975e\u5e38\u6709\u7528\u3002<\/p>\n<p>optval \u53c2\u6570\u662f\u4e00\u4e2a\u6307\u5411\u503c\u7684\u6307\u9488&#xff0c;\u5b83\u6307\u5b9a\u4e86\u9009\u9879\u7684\u5177\u4f53\u503c&#xff0c;\u901a\u5e38\u662f\u4e00\u4e2a\u6574\u578b\u503c&#xff0c;\u4f8b\u5982 1 \u8868\u793a\u542f\u7528\u67d0\u4e2a\u9009\u9879&#xff08;\u5982\u5141\u8bb8\u590d\u7528&#xff09;&#xff0c;\u800c 0 \u8868\u793a\u7981\u7528\u8be5\u9009\u9879\u3002optlen \u53c2\u6570\u5219\u6307\u5b9a\u4e86 optval \u53c2\u6570\u6240\u6307\u5411\u7684\u503c\u7684\u5927\u5c0f&#xff0c;\u8fd9\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\u7528\u4e8e\u786e\u4fdd\u6570\u636e\u7684\u6b63\u786e\u4f20\u9012\u548c\u89e3\u6790\u3002\u901a\u8fc7\u8fd9\u4e9b\u53c2\u6570\u7684\u7ec4\u5408&#xff0c;setsockopt 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