{"id":39548,"date":"2025-05-24T07:16:17","date_gmt":"2025-05-23T23:16:17","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/39548.html"},"modified":"2025-05-24T07:16:17","modified_gmt":"2025-05-23T23:16:17","slug":"%e6%9c%8d%e5%8a%a1%e5%99%a8%e5%b9%b6%e5%8f%91%e5%ae%9e%e7%8e%b0%e7%9a%84%e4%ba%94%e7%a7%8d%e6%96%b9%e6%b3%95","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/39548.html","title":{"rendered":"\u670d\u52a1\u5668\u5e76\u53d1\u5b9e\u73b0\u7684\u4e94\u79cd\u65b9\u6cd5"},"content":{"rendered":"<\/p>\n<h4>\u6587\u7ae0\u76ee\u5f55<\/h4>\n<ul>\n<li>\u524d\u8a00<\/li>\n<li>\u4e00\u3001\u5355\u7ebf\u7a0b \/ \u8fdb\u7a0b<\/li>\n<li>\u4e8c\u3001\u591a\u8fdb\u7a0b\u5e76\u53d1<\/li>\n<li>\u4e09\u3001\u591a\u7ebf\u7a0b\u5e76\u53d1<\/li>\n<li>\u56db\u3001IO\u591a\u8def\u8f6c\u63a5&#xff08;\u590d\u7528&#xff09;select<\/li>\n<li>\u4e94\u3001IO\u591a\u8def\u8f6c\u63a5&#xff08;\u590d\u7528&#xff09;poll<\/li>\n<li>\u516d\u3001IO\u591a\u8def\u8f6c\u63a5&#xff08;\u590d\u7528&#xff09;epoll<\/li>\n<\/ul>\n<h2>\u524d\u8a00<\/h2>\n<p>\u5173\u4e8e\u7f51\u7edc\u7f16\u7a0b\u76f8\u5173\u77e5\u8bc6\u53ef\u770b\u6211\u4e4b\u524d\u5199\u8fc7\u7684\u6587\u7ae0&#xff1a;<\/p>\n<ul>\n<li>TCP\u7f51\u7edc\u901a\u4fe1\u548c\u7f51\u7edc\u7f16\u7a0b\u5e94\u7528\u793a\u4f8b<\/li>\n<\/ul>\n<h2>\u4e00\u3001\u5355\u7ebf\u7a0b \/ \u8fdb\u7a0b<\/h2>\n<p>\u5728TCP\u901a\u4fe1\u8fc7\u7a0b\u4e2d&#xff0c;\u670d\u52a1\u5668\u7aef\u542f\u52a8\u4e4b\u540e\u53ef\u4ee5\u540c\u65f6\u548c\u591a\u4e2a\u5ba2\u6237\u7aef\u5efa\u7acb\u8fde\u63a5&#xff0c;\u5e76\u8fdb\u884c\u7f51\u7edc\u901a\u4fe1&#xff0c;\u5728\u4ee3\u7801\u4e2d\u7ecf\u5e38\u4f1a\u7528\u5230\u4e09\u4e2a\u5f15\u8d77\u7a0b\u5e8f\u963b\u585e\u7684\u51fd\u6570&#xff0c;\u5206\u522b\u662f&#xff1a;<\/p>\n<ul>\n<li>accept()&#xff1a;\u5982\u679c\u670d\u52a1\u5668\u7aef\u6ca1\u6709\u65b0\u5ba2\u6237\u7aef\u8fde\u63a5&#xff0c;\u963b\u585e\u5f53\u524d\u8fdb\u7a0b\/\u7ebf\u7a0b&#xff0c;\u5982\u679c\u68c0\u6d4b\u5230\u65b0\u8fde\u63a5\u89e3\u9664\u963b\u585e&#xff0c;\u5efa\u7acb\u8fde\u63a5<\/li>\n<li>read()&#xff1a;\u5982\u679c\u901a\u4fe1\u7684\u5957\u63a5\u5b57\u5bf9\u5e94\u7684\u8bfb\u7f13\u51b2\u533a\u6ca1\u6709\u6570\u636e&#xff0c;\u963b\u585e\u5f53\u524d\u8fdb\u7a0b\/\u7ebf\u7a0b&#xff0c;\u68c0\u6d4b\u5230\u6570\u636e\u89e3\u9664\u963b\u585e&#xff0c;\u63a5\u6536\u6570\u636e<\/li>\n<li>write()&#xff1a;\u5982\u679c\u901a\u4fe1\u7684\u5957\u63a5\u5b57\u5199\u7f13\u51b2\u533a\u88ab\u5199\u6ee1\u4e86&#xff0c;\u963b\u585e\u5f53\u524d\u8fdb\u7a0b\/\u7ebf\u7a0b&#xff08;\u8fd9\u79cd\u60c5\u51b5\u6bd4\u8f83\u5c11\u89c1&#xff09;<\/li>\n<\/ul>\n<p>\u5982\u679c\u9700\u8981\u548c\u53d1\u8d77\u65b0\u7684\u8fde\u63a5\u8bf7\u6c42\u7684\u5ba2\u6237\u7aef\u5efa\u7acb\u8fde\u63a5&#xff0c;\u90a3\u4e48\u5c31\u5fc5\u987b\u5728\u670d\u52a1\u5668\u7aef\u901a\u8fc7\u4e00\u4e2a\u5faa\u73af\u8c03\u7528 accept() \u51fd\u6570&#xff0c;\u53e6\u5916\u5df2\u7ecf\u548c\u670d\u52a1\u5668\u5efa\u7acb\u8fde\u63a5\u7684\u5ba2\u6237\u7aef\u9700\u8981\u548c\u670d\u52a1\u5668\u901a\u4fe1&#xff0c;\u53d1\u9001\u6570\u636e\u65f6\u7684\u963b\u585e\u53ef\u4ee5\u5ffd\u7565&#xff0c;\u5f53\u63a5\u6536\u4e0d\u5230\u6570\u636e\u65f6\u7a0b\u5e8f\u4e5f\u4f1a\u88ab\u963b\u585e&#xff0c;\u8fd9\u65f6\u5019\u5c31\u4f1a\u975e\u5e38\u77db\u76fe&#xff0c;\u88abaccept()\u963b\u585e\u5c31\u65e0\u6cd5\u901a\u4fe1&#xff0c;\u88ab read() \u963b\u585e\u5c31\u65e0\u6cd5\u548c\u5ba2\u6237\u7aef\u5efa\u7acb\u65b0\u8fde\u63a5\u3002\u56e0\u6b64\u5f97\u51fa\u4e00\u4e2a\u7ed3\u8bba&#xff0c;\u57fa\u4e8e\u4e0a\u8ff0\u5904\u7406\u65b9\u5f0f&#xff0c;\u5728\u5355\u7ebf\u7a0b\/\u5355\u8fdb\u7a0b\u573a\u666f\u4e0b&#xff0c;\u670d\u52a1\u5668\u662f\u65e0\u6cd5\u5904\u7406\u591a\u8fde\u63a5\u7684&#xff0c;\u89e3\u51b3\u65b9\u6848\u4e5f\u6709\u5f88\u591a&#xff0c;\u5e38\u7528\u7684\u6709\u4e09\u79cd&#xff1a;<\/p>\n<ul>\n<li>\u4f7f\u7528\u591a\u7ebf\u7a0b\u5b9e\u73b0<\/li>\n<li>\u4f7f\u7528\u591a\u8fdb\u7a0b\u5b9e\u73b0<\/li>\n<li>\u4f7f\u7528IO\u591a\u8def\u8f6c\u63a5&#xff08;\u590d\u7528&#xff09;\u5b9e\u73b0<\/li>\n<li>\u4f7f\u7528IO\u591a\u8def\u8f6c\u63a5 &#043; \u591a\u7ebf\u7a0b\u5b9e\u73b0<\/li>\n<\/ul>\n<h2>\u4e8c\u3001\u591a\u8fdb\u7a0b\u5e76\u53d1<\/h2>\n<p>\u5982\u679c\u8981\u7f16\u5199\u591a\u8fdb\u7a0b\u7248\u7684\u5e76\u53d1\u670d\u52a1\u5668\u7a0b\u5e8f&#xff0c;\u9996\u5148\u8981\u8003\u8651&#xff0c;\u521b\u5efa\u51fa\u7684\u591a\u4e2a\u8fdb\u7a0b\u90fd\u662f\u4ec0\u4e48\u89d2\u8272&#xff0c;\u8fd9\u6837\u5c31\u53ef\u4ee5\u5728\u7a0b\u5e8f\u4e2d\u5bf9\u53f7\u5165\u5ea7\u4e86\u3002\u5728Tcp\u670d\u52a1\u5668\u7aef\u4e00\u5171\u6709\u4e24\u4e2a\u89d2\u8272&#xff0c;\u5206\u522b\u662f&#xff1a;\u76d1\u542c\u548c\u901a\u4fe1&#xff0c;\u76d1\u542c\u662f\u4e00\u4e2a\u6301\u7eed\u7684\u52a8\u4f5c&#xff0c;\u5982\u679c\u6709\u65b0\u8fde\u63a5\u5c31\u5efa\u7acb\u8fde\u63a5&#xff0c;\u5982\u679c\u6ca1\u6709\u65b0\u8fde\u63a5\u5c31\u963b\u585e\u3002\u5173\u4e8e\u901a\u4fe1\u662f\u9700\u8981\u548c\u591a\u4e2a\u5ba2\u6237\u7aef\u540c\u65f6\u8fdb\u884c\u7684&#xff0c;\u56e0\u6b64\u9700\u8981\u591a\u4e2a\u8fdb\u7a0b&#xff0c;\u8fd9\u6837\u624d\u80fd\u8fbe\u5230\u4e92\u4e0d\u5f71\u54cd\u7684\u6548\u679c\u3002\u8fdb\u7a0b\u4e5f\u6709\u4e24\u5927\u7c7b&#xff1a;\u7236\u8fdb\u7a0b\u548c\u5b50\u8fdb\u7a0b&#xff0c;\u901a\u8fc7\u5206\u6790\u6211\u4eec\u53ef\u4ee5\u8fd9\u6837\u5206\u914d\u8fdb\u7a0b&#xff1a;<\/p>\n<ul>\n<li>\n<p>\u7236\u8fdb\u7a0b&#xff1a;<\/p>\n<ul>\n<li>\u8d1f\u8d23\u76d1\u542c&#xff0c;\u5904\u7406\u5ba2\u6237\u7aef\u7684\u8fde\u63a5\u8bf7\u6c42&#xff0c;\u4e5f\u5c31\u662f\u5728\u7236\u8fdb\u7a0b\u4e2d\u5faa\u73af\u8c03\u7528accept()\u51fd\u6570<\/li>\n<li>\u521b\u5efa\u5b50\u8fdb\u7a0b&#xff1a;\u5efa\u7acb\u4e00\u4e2a\u65b0\u7684\u8fde\u63a5&#xff0c;\u5c31\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u5b50\u8fdb\u7a0b&#xff0c;\u8ba9\u8fd9\u4e2a\u5b50\u8fdb\u7a0b\u548c\u5bf9\u5e94\u7684\u5ba2\u6237\u7aef\u901a\u4fe1<\/li>\n<li>\u56de\u6536\u5b50\u8fdb\u7a0b\u8d44\u6e90&#xff1a;\u5b50\u8fdb\u7a0b\u9000\u51fa\u56de\u6536\u5176\u5185\u6838PCB\u8d44\u6e90&#xff0c;\u9632\u6b62\u51fa\u73b0\u50f5\u5c38\u8fdb\u7a0b<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>\u5b50\u8fdb\u7a0b&#xff1a;\u8d1f\u8d23\u901a\u4fe1&#xff0c;\u57fa\u4e8e\u7236\u8fdb\u7a0b\u5efa\u7acb\u65b0\u8fde\u63a5\u4e4b\u540e\u5f97\u5230\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26&#xff0c;\u548c\u5bf9\u5e94\u7684\u5ba2\u6237\u7aef\u5b8c\u6210\u6570\u636e\u7684\u63a5\u6536\u548c\u53d1\u9001\u3002<\/p>\n<ul>\n<li>\u53d1\u9001\u6570\u636e&#xff1a;send() \/ write()<\/li>\n<li>\u63a5\u6536\u6570\u636e&#xff1a;recv() \/ read()<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>\u5728\u591a\u8fdb\u7a0b\u7248\u7684\u670d\u52a1\u5668\u7aef\u7a0b\u5e8f\u4e2d&#xff0c;\u591a\u4e2a\u8fdb\u7a0b\u662f\u6709\u8840\u7f18\u5173\u7cfb&#xff0c;\u5bf9\u5e94\u6709\u8840\u7f18\u5173\u7cfb\u7684\u8fdb\u7a0b\u6765\u8bf4&#xff0c;\u8fd8\u9700\u8981\u60f3\u660e\u767d\u4ed6\u4eec\u6709\u54ea\u4e9b\u8d44\u6e90\u662f\u53ef\u4ee5\u88ab\u7ee7\u627f\u7684&#xff0c;\u54ea\u4e9b\u8d44\u6e90\u662f\u72ec\u5360\u7684&#xff0c;\u4ee5\u53ca\u4e00\u4e9b\u5176\u4ed6\u7ec6\u8282&#xff1a;<\/p>\n<ul>\n<li>\u5b50\u8fdb\u7a0b\u662f\u7236\u8fdb\u7a0b\u7684\u62f7\u8d1d&#xff0c;\u5728\u5b50\u8fdb\u7a0b\u7684\u5185\u6838\u533aPCB\u4e2d&#xff0c;\u6587\u4ef6\u63cf\u8ff0\u7b26\u4e5f\u662f\u53ef\u4ee5\u88ab\u62f7\u8d1d\u7684&#xff0c;\u56e0\u6b64\u5728\u7236\u8fdb\u7a0b\u53ef\u4ee5\u4f7f\u7528\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u5728\u5b50\u8fdb\u7a0b\u4e2d\u4e5f\u6709\u4e00\u4efd&#xff0c;\u5e76\u4e14\u53ef\u4ee5\u4f7f\u7528\u5b83\u4eec\u505a\u548c\u7236\u8fdb\u7a0b\u4e00\u6837\u7684\u4e8b\u60c5\u3002<\/li>\n<li>\u7236\u5b50\u8fdb\u7a0b\u6709\u7528\u5404\u81ea\u7684\u72ec\u7acb\u7684\u865a\u62df\u5730\u5740\u7a7a\u95f4&#xff0c;\u56e0\u6b64\u6240\u6709\u7684\u8d44\u6e90\u90fd\u662f\u72ec\u5360\u7684<\/li>\n<li>\u4e3a\u4e86\u8282\u7701\u7cfb\u7edf\u8d44\u6e90&#xff0c;\u5bf9\u4e8e\u53ea\u6709\u5728\u7236\u8fdb\u7a0b\u624d\u80fd\u7528\u5230\u7684\u8d44\u6e90&#xff0c;\u53ef\u4ee5\u5728\u5b50\u8fdb\u7a0b\u4e2d\u5c06\u5176\u91ca\u653e\u6389&#xff0c;\u7236\u8fdb\u7a0b\u4ea6\u5982\u6b64\u3002<\/li>\n<li>\u7531\u4e8e\u9700\u8981\u5728\u7236\u8fdb\u7a0b\u4e2d\u505aaccept()\u64cd\u4f5c&#xff0c;\u5e76\u4e14\u8981\u91ca\u653e\u5b50\u8fdb\u7a0b\u8d44\u6e90&#xff0c;\u5982\u679c\u60f3\u8981\u66f4\u9ad8\u6548\u4e00\u4e0b\u53ef\u4ee5\u4f7f\u7528\u4fe1\u53f7\u7684\u65b9\u5f0f\u5904\u7406<\/li>\n<\/ul>\n<p>\u670d\u52a1\u5668\u4ee3\u7801&#xff1a;<\/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 class=\"token comment\">\/* See NOTES *\/<\/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><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;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;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;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;sys\/wait.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;errno.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;signal.h&gt;<\/span><\/span><\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name\">SERVER_PORT<\/span> <span class=\"token expression\"><span class=\"token number\">8888<\/span><\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name\">BACKLOG<\/span>     <span class=\"token expression\"><span class=\"token number\">10<\/span><\/span><\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u4fe1\u53f7\u5904\u7406\u51fd\u6570<\/span><br \/>\n<span class=\"token keyword\">void<\/span> <span class=\"token function\">callback<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> num<span class=\"token punctuation\">)<\/span><br \/>\n<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><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">pid_t<\/span> pid <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">waitpid<\/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 constant\">NULL<\/span><span class=\"token punctuation\">,<\/span> WNOHANG<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>pid <span class=\"token operator\">&lt;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u5b50\u8fdb\u7a0b\u6b63\u5728\u8fd0\u884c, \u6216\u8005\u5b50\u8fdb\u7a0b\u88ab\u56de\u6536\u5b8c\u6bd5\u4e86\\\\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\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;child die, pid &#061; %d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> pid<span class=\"token punctuation\">)<\/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\">int<\/span> <span class=\"token function\">childWork<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> cfd<span class=\"token punctuation\">)<\/span><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 keyword\">int<\/span> argc<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">char<\/span> <span class=\"token operator\">*<\/span><span class=\"token operator\">*<\/span>argv<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">int<\/span> iSocketServer<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> iSocketClient<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr_in<\/span> tSocketServerAddr<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr_in<\/span> tSocketClientAddr<span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> iRet<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> iAddrlen<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> iClientNum <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> cnt <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> iRcvLen<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> iSendLen<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">char<\/span> ucSendBuf<span class=\"token punctuation\">[<\/span><span class=\"token number\">1000<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">char<\/span> ucRcvBuf<span class=\"token punctuation\">[<\/span><span class=\"token number\">1000<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/* 1. socket *\/<\/span><br \/>\niSocketServer <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> <\/p>\n<p>tSocketServerAddr<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 \/>\ntSocketServerAddr<span class=\"token punctuation\">.<\/span>sin_family      <span class=\"token operator\">&#061;<\/span> AF_INET<span class=\"token punctuation\">;<\/span><br \/>\ntSocketServerAddr<span class=\"token punctuation\">.<\/span>sin_port    <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">htons<\/span><span class=\"token punctuation\">(<\/span>SERVER_PORT<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token function\">memset<\/span><span class=\"token punctuation\">(<\/span>tSocketServerAddr<span class=\"token punctuation\">.<\/span>sin_zero<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">8<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/* 2. bind   *\/<\/span><br \/>\niRet <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">bind<\/span><span class=\"token punctuation\">(<\/span>iSocketServer<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">const<\/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>tSocketServerAddr<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\">sockaddr_in<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/* 3. listen *\/<\/span><br \/>\niRet <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">listen<\/span><span class=\"token punctuation\">(<\/span>iSocketServer<span class=\"token punctuation\">,<\/span> BACKLOG<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u6ce8\u518c\u4fe1\u53f7\u7684\u6355\u6349<\/span><br \/>\n<span class=\"token comment\">\/\/ \u7528\u4e8e\u7236\u8fdb\u7a0b\u7ba1\u7406\u5b50\u8fdb\u7a0b\u7684\u9000\u51fa\u72b6\u6001&#xff0c;\u907f\u514d\u50f5\u5c38\u8fdb\u7a0b<\/span><br \/>\n<span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sigaction<\/span> act<span class=\"token punctuation\">;<\/span><br \/>\nact<span class=\"token punctuation\">.<\/span>sa_flags <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\nact<span class=\"token punctuation\">.<\/span>sa_handler <span class=\"token operator\">&#061;<\/span> callback<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token function\">sigemptyset<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>act<span class=\"token punctuation\">.<\/span>sa_mask<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token function\">sigaction<\/span><span class=\"token punctuation\">(<\/span>SIGCHLD<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>act<span class=\"token punctuation\">,<\/span> <span class=\"token constant\">NULL<\/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 number\">1<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token comment\">\/* 4. accept *\/<\/span><br \/>\niAddrlen <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr_in<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\niSocketClient <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">accept<\/span><span class=\"token punctuation\">(<\/span>iSocketServer<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>tSocketClientAddr<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>iAddrlen<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>iSocketClient <span class=\"token operator\">&#061;&#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 keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>errno <span class=\"token operator\">&#061;&#061;<\/span> EINTR<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">continue<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token function\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;accept&#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 number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>iClientNum<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;get connect from client %d:%s\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> iClientNum<span class=\"token punctuation\">,<\/span> <span class=\"token function\">inet_ntoa<\/span><span class=\"token punctuation\">(<\/span>tSocketClientAddr<span class=\"token punctuation\">.<\/span>sin_addr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/* \u521b\u5efa\u4e00\u4e2a\u5b50\u8fdb\u7a0b *\/<\/span><br \/>\n<span class=\"token class-name\">pid_t<\/span> pid <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">fork<\/span><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>pid <span class=\"token operator\">&#061;&#061;<\/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 comment\">\/\/ \u5b50\u8fdb\u7a0b -&gt; \u548c\u5ba2\u6237\u7aef\u901a\u4fe1<\/span><br \/>\n<span class=\"token comment\">\/\/ \u901a\u4fe1\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26cfd\u88ab\u62f7\u8d1d\u5230\u5b50\u8fdb\u7a0b\u4e2d<\/span><br \/>\n<span class=\"token comment\">\/\/ \u5b50\u8fdb\u7a0b\u4e0d\u8d1f\u8d23\u76d1\u542c<\/span><br \/>\n<span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>iSocketServer<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><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">int<\/span> ret <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">childWork<\/span><span class=\"token punctuation\">(<\/span>iSocketClient<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\">&lt;&#061;<\/span> <span class=\"token number\">0<\/span><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 punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token comment\">\/\/ \u9000\u51fa\u5b50\u8fdb\u7a0b<\/span><br \/>\n<span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>iSocketClient<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 number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token keyword\">else<\/span> <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>pid <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token comment\">\/\/ \u7236\u8fdb\u7a0b\u4e0d\u548c\u5ba2\u6237\u7aef\u901a\u4fe1<\/span><br \/>\n            <span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>iSocketClient<span class=\"token punctuation\">)<\/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\">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 comment\">\/\/ 5. \u548c\u5ba2\u6237\u7aef\u901a\u4fe1<\/span><br \/>\n<span class=\"token keyword\">int<\/span> <span class=\"token function\">childWork<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> cfd<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u63a5\u6536\u6570\u636e<\/span><br \/>\n    <span class=\"token keyword\">char<\/span> buf<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 function\">memset<\/span><span class=\"token punctuation\">(<\/span>buf<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>buf<span class=\"token punctuation\">)<\/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>cfd<span class=\"token punctuation\">,<\/span> buf<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>buf<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\">&gt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <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\u7aefsay: %s\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> buf<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">write<\/span><span class=\"token punctuation\">(<\/span>cfd<span class=\"token punctuation\">,<\/span> buf<span class=\"token punctuation\">,<\/span> len<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <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><br \/>\n    <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\u65ad\u5f00\u4e86\u8fde\u63a5&#8230;\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">else<\/span><br \/>\n    <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 punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">return<\/span> len<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u5ba2\u6237\u7aef\u4ee3\u7801&#xff1a;<\/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 class=\"token comment\">\/* See NOTES *\/<\/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><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;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;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;unistd.h&gt;<\/span><\/span><\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name\">SERVER_PORT<\/span> <span class=\"token expression\"><span class=\"token number\">8888<\/span><\/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><span class=\"token operator\">*<\/span>argv<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">int<\/span> iSocketClient<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr_in<\/span> tSocketClientAddr<span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> iRet<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> iClientNum <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> iSendLen<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> iRcvLen<span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">char<\/span> ucSendBuf<span class=\"token punctuation\">[<\/span><span class=\"token number\">1000<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">char<\/span> ucRcvBuf<span class=\"token punctuation\">[<\/span><span class=\"token number\">1000<\/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>argc <span class=\"token operator\">!&#061;<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Usage:%s IP\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> 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 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\">\/* 1. socket  *\/<\/span><br \/>\niSocketClient <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> <\/p>\n<p><span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span> <span class=\"token operator\">&#061;&#061;<\/span> iSocketClient<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;socket error!\\\\n&#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>tSocketClientAddr<span class=\"token punctuation\">.<\/span>sin_family <span class=\"token operator\">&#061;<\/span> AF_INET<span class=\"token punctuation\">;<\/span><br \/>\ntSocketClientAddr<span class=\"token punctuation\">.<\/span>sin_port   <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">htons<\/span><span class=\"token punctuation\">(<\/span>SERVER_PORT<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/* 2. inet_aton *\/<\/span><br \/>\niRet <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">inet_aton<\/span><span class=\"token punctuation\">(<\/span>argv<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>tSocketClientAddr<span class=\"token punctuation\">.<\/span>sin_addr<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 number\">0<\/span> <span class=\"token operator\">&#061;&#061;<\/span> iRet<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;inet_aton error!\\\\n&#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 function\">memset<\/span><span class=\"token punctuation\">(<\/span>tSocketClientAddr<span class=\"token punctuation\">.<\/span>sin_zero<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">8<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/* 3. connect  *\/<\/span><br \/>\niRet <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">connect<\/span><span class=\"token punctuation\">(<\/span>iSocketClient<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>tSocketClientAddr<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\">sockaddr_in<\/span><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><span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span> <span class=\"token operator\">&#061;&#061;<\/span> iRet<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;connect error!\\\\n&#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><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token comment\">\/* \u7528\u6765\u8bfb\u53d6\u7ec8\u7aef\u8f93\u5165\u7684\u4e00\u884c\u6570\u636e *\/<\/span><br \/>\n<span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token function\">fgets<\/span><span class=\"token punctuation\">(<\/span>ucSendBuf<span class=\"token punctuation\">,<\/span> <span class=\"token number\">999<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token constant\">stdin<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token comment\">\/* \u53d1\u9001\u8be5\u884c\u6570\u636e\u7ed9\u670d\u52a1\u5668 *\/<\/span><br \/>\niSendLen <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">send<\/span><span class=\"token punctuation\">(<\/span>iSocketClient<span class=\"token punctuation\">,<\/span> ucSendBuf<span class=\"token punctuation\">,<\/span> <span class=\"token function\">strlen<\/span><span class=\"token punctuation\">(<\/span>ucSendBuf<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>iSendLen <span class=\"token operator\">&lt;&#061;<\/span> <span class=\"token number\">0<\/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>iSocketClient<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\u670d\u52a1\u5668\u53d1\u8fc7\u6765\u7684\u6570\u636e *\/<\/span><br \/>\niRcvLen <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">recv<\/span><span class=\"token punctuation\">(<\/span>iSocketClient<span class=\"token punctuation\">,<\/span> ucRcvBuf<span class=\"token punctuation\">,<\/span> <span class=\"token number\">999<\/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>iRcvLen <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\nucRcvBuf<span class=\"token punctuation\">[<\/span>iRcvLen<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token char\">&#039;\\\\0&#039;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;get msg from server:%s\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> ucRcvBuf<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<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>iSocketClient<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>\u5728\u4e0a\u9762\u7684\u793a\u4f8b\u4ee3\u7801\u4e2d&#xff0c;\u7236\u5b50\u8fdb\u7a0b\u4e2d\u5206\u522b\u5173\u6389\u4e86\u7528\u4e0d\u5230\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26&#xff08;\u7236\u8fdb\u7a0b\u4e0d\u9700\u8981\u901a\u4fe1&#xff0c;\u5b50\u8fdb\u7a0b\u4e5f\u4e0d\u9700\u8981\u76d1\u542c&#xff09;\u3002\u5982\u679c\u5ba2\u6237\u7aef\u4e3b\u52a8\u65ad\u5f00\u8fde\u63a5&#xff0c;\u90a3\u4e48\u670d\u52a1\u5668\u7aef\u8d1f\u8d23\u548c\u5ba2\u6237\u7aef\u901a\u4fe1\u7684\u5b50\u8fdb\u7a0b\u4e5f\u5c31\u9000\u51fa\u4e86&#xff0c;\u5b50\u8fdb\u7a0b\u9000\u51fa\u4e4b\u540e\u4f1a\u7ed9\u7236\u8fdb\u7a0b\u53d1\u9001\u4e00\u4e2a\u53eb\u505a SIGCHLD\u7684\u4fe1\u53f7&#xff0c;\u5728\u7236\u8fdb\u7a0b\u4e2d\u901a\u8fc7sigaction()\u51fd\u6570\u6355\u6349\u4e86\u8be5\u4fe1\u53f7&#xff0c;\u901a\u8fc7\u56de\u8c03\u51fd\u6570callback()\u4e2d\u7684waitpid()\u5bf9\u9000\u51fa\u7684\u5b50\u8fdb\u7a0b\u8fdb\u884c\u4e86\u8d44\u6e90\u56de\u6536\u3002<\/p>\n<p>\u53e6\u5916\u8fd8\u6709\u4e00\u4e2a\u7ec6\u8282\u8981\u8bf4\u660e\u4e00\u4e0b&#xff0c;\u8fd9\u662f\u7236\u8fdb\u7a0b\u7684\u5904\u7406\u4ee3\u7801&#xff1a;<\/p>\n<p><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>clilen<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><br \/>\n<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>clilen<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><br \/>\n        <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>errno <span class=\"token operator\">&#061;&#061;<\/span> EINTR<span class=\"token punctuation\">)<\/span><br \/>\n            <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token comment\">\/\/ accept\u8c03\u7528\u88ab\u4fe1\u53f7\u4e2d\u65ad\u4e86, \u89e3\u9664\u963b\u585e, \u8fd4\u56de\u4e86-1<\/span><br \/>\n                <span class=\"token comment\">\/\/ \u91cd\u65b0\u8c03\u7528\u4e00\u6b21accept<\/span><br \/>\n                <span class=\"token keyword\">continue<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n            <span class=\"token function\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;accept&#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 number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token punctuation\">}<\/span><br \/>\n <span class=\"token punctuation\">}<\/span><\/p>\n<p>\u5982\u679c\u7236\u8fdb\u7a0b\u8c03\u7528accept() \u51fd\u6570\u6ca1\u6709\u68c0\u6d4b\u5230\u65b0\u7684\u5ba2\u6237\u7aef\u8fde\u63a5&#xff0c;\u7236\u8fdb\u7a0b\u5c31\u963b\u585e\u5728\u8fd9\u513f\u4e86&#xff0c;\u8fd9\u65f6\u5019\u6709\u5b50\u8fdb\u7a0b\u9000\u51fa\u4e86&#xff0c;\u53d1\u9001\u4fe1\u53f7\u7ed9\u7236\u8fdb\u7a0b&#xff0c;\u7236\u8fdb\u7a0b\u5c31\u6355\u6349\u5230\u4e86\u8fd9\u4e2a\u4fe1\u53f7SIGCHLD&#xff0c; \u7531\u4e8e\u4fe1\u53f7\u7684\u4f18\u5148\u7ea7\u5f88\u9ad8&#xff0c;\u4f1a\u6253\u65ad\u4ee3\u7801\u6b63\u5e38\u7684\u6267\u884c\u6d41\u7a0b&#xff0c;\u56e0\u6b64\u7236\u8fdb\u7a0b\u7684\u963b\u585e\u88ab\u4e2d\u65ad&#xff0c;\u8f6c\u800c\u53bb\u5904\u7406\u8fd9\u4e2a\u4fe1\u53f7\u5bf9\u5e94\u7684\u51fd\u6570callback()&#xff0c;\u5904\u7406\u5b8c\u6bd5&#xff0c;\u518d\u6b21\u56de\u5230accept()\u4f4d\u7f6e&#xff0c;\u4f46\u662f\u8fd9\u662f\u5df2\u7ecf\u65e0\u6cd5\u963b\u585e\u4e86&#xff0c;\u51fd\u6570\u76f4\u63a5\u8fd4\u56de-1&#xff0c;\u6b64\u65f6\u51fd\u6570\u8c03\u7528\u5931\u8d25&#xff0c;\u9519\u8bef\u63cf\u8ff0\u4e3aaccept: Interrupted system call&#xff0c;\u5bf9\u5e94\u7684\u9519\u8bef\u53f7\u4e3aEINTR&#xff0c;\u7531\u4e8e\u4ee3\u7801\u662f\u88ab\u4fe1\u53f7\u4e2d\u65ad\u5bfc\u81f4\u7684\u9519\u8bef&#xff0c;\u6240\u4ee5\u53ef\u4ee5\u5728\u7a0b\u5e8f\u4e2d\u5bf9\u8fd9\u4e2a\u9519\u8bef\u53f7\u8fdb\u884c\u5224\u65ad&#xff0c;\u8ba9\u7236\u8fdb\u7a0b\u91cd\u65b0\u8c03\u7528accept()&#xff0c;\u7ee7\u7eed\u963b\u585e\u6216\u8005\u63a5\u53d7\u5ba2\u6237\u7aef\u7684\u65b0\u8fde\u63a5\u3002<\/p>\n<h2>\u4e09\u3001\u591a\u7ebf\u7a0b\u5e76\u53d1<\/h2>\n<p>\u7f16\u5199\u591a\u7ebf\u7a0b\u7248\u7684\u5e76\u53d1\u670d\u52a1\u5668\u7a0b\u5e8f\u548c\u591a\u8fdb\u7a0b\u601d\u8def\u5dee\u4e0d\u591a&#xff0c;\u8003\u8651\u660e\u767d\u4e86\u5bf9\u53f7\u5165\u5ea7\u5373\u53ef\u3002\u591a\u7ebf\u7a0b\u4e2d\u7684\u7ebf\u7a0b\u6709\u4e24\u5927\u7c7b&#xff1a;\u4e3b\u7ebf\u7a0b&#xff08;\u7236\u7ebf\u7a0b&#xff09;\u548c\u5b50\u7ebf\u7a0b&#xff0c;\u4ed6\u4eec\u5206\u522b\u8981\u5728\u670d\u52a1\u5668\u7aef\u5904\u7406\u76d1\u542c\u548c\u901a\u4fe1\u6d41\u7a0b\u3002\u6839\u636e\u591a\u8fdb\u7a0b\u7684\u5904\u7406\u601d\u8def&#xff0c;\u5c31\u53ef\u4ee5\u8fd9\u6837\u8bbe\u8ba1\u4e86&#xff1a;<\/p>\n<ul>\n<li>\n<p>\u4e3b\u7ebf\u7a0b&#xff1a;<\/p>\n<ul>\n<li>\u8d1f\u8d23\u76d1\u542c&#xff0c;\u5904\u7406\u5ba2\u6237\u7aef\u7684\u8fde\u63a5\u8bf7\u6c42&#xff0c;\u4e5f\u5c31\u662f\u5728\u7236\u8fdb\u7a0b\u4e2d\u5faa\u73af\u8c03\u7528accept()\u51fd\u6570<\/li>\n<li>\u521b\u5efa\u5b50\u7ebf\u7a0b&#xff1a;\u5efa\u7acb\u4e00\u4e2a\u65b0\u7684\u8fde\u63a5&#xff0c;\u5c31\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u5b50\u8fdb\u7a0b&#xff0c;\u8ba9\u8fd9\u4e2a\u5b50\u8fdb\u7a0b\u548c\u5bf9\u5e94\u7684\u5ba2\u6237\u7aef\u901a\u4fe1<\/li>\n<li>\u56de\u6536\u5b50\u7ebf\u7a0b\u8d44\u6e90&#xff1a;\u7531\u4e8e\u56de\u6536\u9700\u8981\u8c03\u7528\u963b\u585e\u51fd\u6570&#xff0c;\u8fd9\u6837\u5c31\u4f1a\u5f71\u54cdaccept()&#xff0c;\u76f4\u63a5\u505a\u7ebf\u7a0b\u5206\u79bb\u5373\u53ef\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>\u5b50\u7ebf\u7a0b&#xff1a;\u8d1f\u8d23\u901a\u4fe1&#xff0c;\u57fa\u4e8e\u4e3b\u7ebf\u7a0b\u5efa\u7acb\u65b0\u8fde\u63a5\u4e4b\u540e\u5f97\u5230\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26&#xff0c;\u548c\u5bf9\u5e94\u7684\u5ba2\u6237\u7aef\u5b8c\u6210\u6570\u636e\u7684\u63a5\u6536\u548c\u53d1\u9001\u3002<\/p>\n<ul>\n<li>\u53d1\u9001\u6570\u636e&#xff1a;send() \/ write()<\/li>\n<li>\u63a5\u6536\u6570\u636e&#xff1a;recv() \/ read()<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>\u5728\u591a\u7ebf\u7a0b\u7248\u7684\u670d\u52a1\u5668\u7aef\u7a0b\u5e8f\u4e2d&#xff0c;\u591a\u4e2a\u7ebf\u7a0b\u5171\u7528\u540c\u4e00\u4e2a\u5730\u5740\u7a7a\u95f4&#xff0c;\u6709\u4e9b\u6570\u636e\u662f\u5171\u4eab\u7684&#xff0c;\u6709\u4e9b\u6570\u636e\u7684\u72ec\u5360\u7684&#xff0c;\u4e0b\u9762\u6765\u5206\u6790\u4e00\u4e9b\u5176\u4e2d\u7684\u4e00\u4e9b\u7ec6\u8282&#xff1a;<\/p>\n<ul>\n<li>\u540c\u4e00\u5730\u5740\u7a7a\u95f4\u4e2d\u7684\u591a\u4e2a\u7ebf\u7a0b\u7684\u6808\u7a7a\u95f4\u662f\u72ec\u5360\u7684<\/li>\n<li>\u591a\u4e2a\u7ebf\u7a0b\u5171\u4eab\u5168\u5c40\u6570\u636e\u533a&#xff0c;\u5806\u533a&#xff0c;\u4ee5\u53ca\u5185\u6838\u533a\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u7b49\u8d44\u6e90&#xff0c;\u56e0\u6b64\u9700\u8981\u6ce8\u610f\u6570\u636e\u8986\u76d6\u95ee\u9898&#xff0c;\u5e76\u4e14\u5728\u591a\u4e2a\u7ebf\u7a0b\u8bbf\u95ee\u5171\u4eab\u8d44\u6e90\u7684\u65f6\u5019&#xff0c;\u8fd8\u9700\u8981\u8fdb\u884c\u7ebf\u7a0b\u540c\u6b65\u3002<\/li>\n<\/ul>\n<p>\u670d\u52a1\u5668\u4ee3\u7801&#xff1a;<\/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;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><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;pthread.h&gt;<\/span><\/span><\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name\">SERVER_PORT<\/span> <span class=\"token expression\"><span class=\"token number\">8888<\/span><\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name\">BACKLOG<\/span>     <span class=\"token expression\"><span class=\"token number\">10<\/span><\/span><\/span><\/p>\n<p><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">SockInfo<\/span><br \/>\n<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<\/span><br \/>\n    <span class=\"token class-name\">pthread_t<\/span> tid<span class=\"token punctuation\">;<\/span>               <span class=\"token comment\">\/\/ \u7ebf\u7a0bID<\/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\">\/\/ \u5730\u5740\u4fe1\u606f<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">SockInfo<\/span> infos<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><br \/>\n<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><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">SockInfo<\/span><span class=\"token operator\">*<\/span> info <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><br \/>\n        <span class=\"token comment\">\/\/ \u63a5\u6536\u6570\u636e<\/span><br \/>\n        <span class=\"token keyword\">char<\/span> buf<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> ret <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">read<\/span><span class=\"token punctuation\">(<\/span>info<span class=\"token operator\">-&gt;<\/span>fd<span class=\"token punctuation\">,<\/span> buf<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>buf<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 number\">0<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <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\u5173\u95ed\u8fde\u63a5&#8230;\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            info<span class=\"token operator\">-&gt;<\/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><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\">else<\/span> <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><br \/>\n        <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u63a5\u6536\u6570\u636e\u5931\u8d25&#8230;\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            info<span class=\"token operator\">-&gt;<\/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><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\">else<\/span><br \/>\n        <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\u7aefsay: %s\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> buf<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token function\">write<\/span><span class=\"token punctuation\">(<\/span>info<span class=\"token operator\">-&gt;<\/span>fd<span class=\"token punctuation\">,<\/span> buf<span class=\"token punctuation\">,<\/span> <span class=\"token function\">strlen<\/span><span class=\"token punctuation\">(<\/span>buf<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 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 keyword\">int<\/span> argc<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">char<\/span> <span class=\"token operator\">*<\/span><span class=\"token operator\">*<\/span>argv<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">int<\/span> iSocketServer<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> iSocketClient<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr_in<\/span> tSocketServerAddr<span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> iRet<span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/* 1. socket *\/<\/span><br \/>\niSocketServer <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> <\/p>\n<p>tSocketServerAddr<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 \/>\ntSocketServerAddr<span class=\"token punctuation\">.<\/span>sin_family      <span class=\"token operator\">&#061;<\/span> AF_INET<span class=\"token punctuation\">;<\/span><br \/>\ntSocketServerAddr<span class=\"token punctuation\">.<\/span>sin_port    <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">htons<\/span><span class=\"token punctuation\">(<\/span>SERVER_PORT<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token function\">memset<\/span><span class=\"token punctuation\">(<\/span>tSocketServerAddr<span class=\"token punctuation\">.<\/span>sin_zero<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">8<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/* 2. bind   *\/<\/span><br \/>\niRet <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">bind<\/span><span class=\"token punctuation\">(<\/span>iSocketServer<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">const<\/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>tSocketServerAddr<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\">sockaddr_in<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/* 3. listen *\/<\/span><br \/>\niRet <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">listen<\/span><span class=\"token punctuation\">(<\/span>iSocketServer<span class=\"token punctuation\">,<\/span> BACKLOG<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 keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u6570\u636e\u521d\u59cb\u5316<\/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>infos<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">\/<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>infos<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><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">memset<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>infos<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>infos<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        infos<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><br \/>\n        infos<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 keyword\">while<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token comment\">\/\/ \u521b\u5efa\u5b50\u7ebf\u7a0b<\/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><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>infos<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><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\npinfo <span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">&amp;<\/span>infos<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><br \/>\n<span class=\"token punctuation\">{<\/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 \/>\ni<span class=\"token operator\">&#8212;<\/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 comment\">\/* 4. accept *\/<\/span><br \/>\n<span class=\"token keyword\">int<\/span> iSocketClient <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">accept<\/span><span class=\"token punctuation\">(<\/span>iSocketServer<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>pinfo<span class=\"token operator\">-&gt;<\/span>addr<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 function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;parent thread, iSocketClient: %d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> iSocketClient<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>iSocketClient <span class=\"token operator\">&#061;&#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 function\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;accept&#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 number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\npinfo<span class=\"token operator\">-&gt;<\/span>fd <span class=\"token operator\">&#061;<\/span> iSocketClient<span class=\"token punctuation\">;<\/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 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>iSocketServer<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>\u5ba2\u6237\u7aef\u4ee3\u7801&#xff1a;<\/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 class=\"token comment\">\/* See NOTES *\/<\/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><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;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;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;unistd.h&gt;<\/span><\/span><\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name\">SERVER_PORT<\/span> <span class=\"token expression\"><span class=\"token number\">8888<\/span><\/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><span class=\"token operator\">*<\/span>argv<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">int<\/span> iSocketClient<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr_in<\/span> tSocketClientAddr<span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> iRet<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> iClientNum <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> iSendLen<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> iRcvLen<span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">char<\/span> ucSendBuf<span class=\"token punctuation\">[<\/span><span class=\"token number\">1000<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">char<\/span> ucRcvBuf<span class=\"token punctuation\">[<\/span><span class=\"token number\">1000<\/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>argc <span class=\"token operator\">!&#061;<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Usage:%s IP\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> 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 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\">\/* 1. socket  *\/<\/span><br \/>\niSocketClient <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> <\/p>\n<p><span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span> <span class=\"token operator\">&#061;&#061;<\/span> iSocketClient<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;socket error!\\\\n&#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>tSocketClientAddr<span class=\"token punctuation\">.<\/span>sin_family <span class=\"token operator\">&#061;<\/span> AF_INET<span class=\"token punctuation\">;<\/span><br \/>\ntSocketClientAddr<span class=\"token punctuation\">.<\/span>sin_port   <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">htons<\/span><span class=\"token punctuation\">(<\/span>SERVER_PORT<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/* 2. inet_aton *\/<\/span><br \/>\niRet <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">inet_aton<\/span><span class=\"token punctuation\">(<\/span>argv<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>tSocketClientAddr<span class=\"token punctuation\">.<\/span>sin_addr<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 number\">0<\/span> <span class=\"token operator\">&#061;&#061;<\/span> iRet<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;inet_aton error!\\\\n&#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 function\">memset<\/span><span class=\"token punctuation\">(<\/span>tSocketClientAddr<span class=\"token punctuation\">.<\/span>sin_zero<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">8<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/* 3. connect  *\/<\/span><br \/>\niRet <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">connect<\/span><span class=\"token punctuation\">(<\/span>iSocketClient<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>tSocketClientAddr<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\">sockaddr_in<\/span><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><span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span> <span class=\"token operator\">&#061;&#061;<\/span> iRet<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;connect error!\\\\n&#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><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token comment\">\/* \u7528\u6765\u8bfb\u53d6\u7ec8\u7aef\u8f93\u5165\u7684\u4e00\u884c\u6570\u636e *\/<\/span><br \/>\n<span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token function\">fgets<\/span><span class=\"token punctuation\">(<\/span>ucSendBuf<span class=\"token punctuation\">,<\/span> <span class=\"token number\">999<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token constant\">stdin<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token comment\">\/* \u53d1\u9001\u8be5\u884c\u6570\u636e\u7ed9\u670d\u52a1\u5668 *\/<\/span><br \/>\niSendLen <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">send<\/span><span class=\"token punctuation\">(<\/span>iSocketClient<span class=\"token punctuation\">,<\/span> ucSendBuf<span class=\"token punctuation\">,<\/span> <span class=\"token function\">strlen<\/span><span class=\"token punctuation\">(<\/span>ucSendBuf<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>iSendLen <span class=\"token operator\">&lt;&#061;<\/span> <span class=\"token number\">0<\/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>iSocketClient<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\u670d\u52a1\u5668\u53d1\u8fc7\u6765\u7684\u6570\u636e *\/<\/span><br \/>\niRcvLen <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">recv<\/span><span class=\"token punctuation\">(<\/span>iSocketClient<span class=\"token punctuation\">,<\/span> ucRcvBuf<span class=\"token punctuation\">,<\/span> <span class=\"token number\">999<\/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>iRcvLen <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\nucRcvBuf<span class=\"token punctuation\">[<\/span>iRcvLen<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token char\">&#039;\\\\0&#039;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;get msg from server:%s\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> ucRcvBuf<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<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>iSocketClient<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>\u7f16\u8bd1\u8fd0\u884c\u7ed3\u679c&#xff1a; <img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/05\/20250523231615-683101bfb5123.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h2>\u56db\u3001IO\u591a\u8def\u8f6c\u63a5&#xff08;\u590d\u7528&#xff09;select<\/h2>\n<p>\u670d\u52a1\u5668\u4ee3\u7801&#xff1a;<\/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;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><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><\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name\">SERVER_PORT<\/span> <span class=\"token expression\"><span class=\"token number\">8888<\/span><\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name\">BACKLOG<\/span>     <span class=\"token expression\"><span class=\"token number\">10<\/span><\/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><span class=\"token operator\">*<\/span>argv<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">int<\/span> iSocketServer<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> iSocketClient<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr_in<\/span> tSocketServerAddr<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr_in<\/span> tSocketClientAddr<span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> iRet<span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/* 1. socket *\/<\/span><br \/>\niSocketServer <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> <\/p>\n<p>tSocketServerAddr<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 \/>\ntSocketServerAddr<span class=\"token punctuation\">.<\/span>sin_family      <span class=\"token operator\">&#061;<\/span> AF_INET<span class=\"token punctuation\">;<\/span><br \/>\ntSocketServerAddr<span class=\"token punctuation\">.<\/span>sin_port    <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">htons<\/span><span class=\"token punctuation\">(<\/span>SERVER_PORT<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token function\">memset<\/span><span class=\"token punctuation\">(<\/span>tSocketServerAddr<span class=\"token punctuation\">.<\/span>sin_zero<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">8<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/* 2. bind   *\/<\/span><br \/>\niRet <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">bind<\/span><span class=\"token punctuation\">(<\/span>iSocketServer<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">const<\/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>tSocketServerAddr<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\">sockaddr_in<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/* 3. listen *\/<\/span><br \/>\niRet <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">listen<\/span><span class=\"token punctuation\">(<\/span>iSocketServer<span class=\"token punctuation\">,<\/span> BACKLOG<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u5c06\u76d1\u542c\u7684fd\u7684\u72b6\u6001\u68c0\u6d4b\u59d4\u6258\u7ed9\u5185\u6838\u68c0\u6d4b<\/span><br \/>\n<span class=\"token keyword\">int<\/span> maxfd <span class=\"token operator\">&#061;<\/span> iSocketServer<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token comment\">\/\/ \u521d\u59cb\u5316\u68c0\u6d4b\u7684\u8bfb\u96c6\u5408<\/span><br \/>\nfd_set rdset<span class=\"token punctuation\">;<\/span><br \/>\nfd_set rdtemp<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token comment\">\/\/ \u6e05\u96f6<\/span><br \/>\n<span class=\"token function\">FD_ZERO<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>rdset<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token comment\">\/\/ \u5c06\u76d1\u542c\u7684iSocketServer\u8bbe\u7f6e\u5230\u68c0\u6d4b\u7684\u8bfb\u96c6\u5408\u4e2d<\/span><br \/>\n<span class=\"token function\">FD_SET<\/span><span class=\"token punctuation\">(<\/span>iSocketServer<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>rdset<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token comment\">\/\/ \u901a\u8fc7select\u59d4\u6258\u5185\u6838\u68c0\u6d4b\u8bfb\u96c6\u5408\u4e2d\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u72b6\u6001, \u68c0\u6d4bread\u7f13\u51b2\u533a\u6709\u6ca1\u6709\u6570\u636e<\/span><br \/>\n<span class=\"token comment\">\/\/ \u5982\u679c\u6709\u6570\u636e, select\u89e3\u9664\u963b\u585e\u8fd4\u56de<\/span><br \/>\n<span class=\"token comment\">\/\/ \u5e94\u8be5\u8ba9\u5185\u6838\u6301\u7eed\u68c0\u6d4b<\/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><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token comment\">\/\/ \u9ed8\u8ba4\u963b\u585e<\/span><br \/>\n<span class=\"token comment\">\/\/ rdset \u4e2d\u662f\u59d4\u6258\u5185\u6838\u68c0\u6d4b\u7684\u6240\u6709\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26<\/span><br \/>\nrdtemp <span class=\"token operator\">&#061;<\/span> rdset<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> num <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">select<\/span><span class=\"token punctuation\">(<\/span>maxfd <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>rdtemp<span class=\"token punctuation\">,<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token comment\">\/\/ rdset\u4e2d\u7684\u6570\u636e\u88ab\u5185\u6838\u6539\u5199\u4e86, \u53ea\u4fdd\u7559\u4e86\u53d1\u751f\u53d8\u5316\u7684\u6587\u4ef6\u63cf\u8ff0\u7684\u6807\u5fd7\u4f4d\u4e0a\u76841, \u6ca1\u53d8\u5316\u7684\u6539\u4e3a0<\/span><br \/>\n<span class=\"token comment\">\/\/ \u53ea\u8981rdset\u4e2d\u7684fd\u5bf9\u5e94\u7684\u6807\u5fd7\u4f4d\u4e3a1 -&gt; \u7f13\u51b2\u533a\u6709\u6570\u636e\u4e86<\/span><br \/>\n<span class=\"token comment\">\/\/ \u5224\u65ad<\/span><br \/>\n<span class=\"token comment\">\/\/ \u6709\u6ca1\u6709\u65b0\u8fde\u63a5<\/span><br \/>\n<span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span><span class=\"token function\">FD_ISSET<\/span><span class=\"token punctuation\">(<\/span>iSocketServer<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>rdtemp<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token comment\">\/\/ \u63a5\u53d7\u8fde\u63a5\u8bf7\u6c42, \u8fd9\u4e2a\u8c03\u7528\u4e0d\u963b\u585e<\/span><br \/>\n<span class=\"token keyword\">int<\/span> cliLen <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>tSocketClientAddr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> iSocketClient <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">accept<\/span><span class=\"token punctuation\">(<\/span>iSocketServer<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>tSocketClientAddr<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>cliLen<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u5f97\u5230\u4e86\u6709\u6548\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26<\/span><br \/>\n<span class=\"token comment\">\/\/ \u901a\u4fe1\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u6dfb\u52a0\u5230\u8bfb\u96c6\u5408<\/span><br \/>\n<span class=\"token comment\">\/\/ \u5728\u4e0b\u4e00\u8f6eselect\u68c0\u6d4b\u7684\u65f6\u5019, \u5c31\u80fd\u5f97\u5230\u7f13\u51b2\u533a\u7684\u72b6\u6001<\/span><br \/>\n<span class=\"token function\">FD_SET<\/span><span class=\"token punctuation\">(<\/span>iSocketClient<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>rdset<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token comment\">\/\/ \u91cd\u7f6e\u6700\u5927\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26<\/span><br \/>\nmaxfd <span class=\"token operator\">&#061;<\/span> iSocketClient <span class=\"token operator\">&gt;<\/span> maxfd <span class=\"token operator\">?<\/span> iSocketClient <span class=\"token operator\">:<\/span> maxfd<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u6ca1\u6709\u65b0\u8fde\u63a5, \u901a\u4fe1<\/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> maxfd <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token comment\">\/\/ \u6392\u9664\u76d1\u542c\u670d\u52a1\u5668\u5957\u63a5\u5b57&#xff0c;\u4ec5\u5904\u7406\u5ba2\u6237\u7aef\u5957\u63a5\u5b57<\/span><br \/>\n<span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>i <span class=\"token operator\">!&#061;<\/span> iSocketServer <span class=\"token operator\">&amp;&amp;<\/span> <span class=\"token function\">FD_ISSET<\/span><span class=\"token punctuation\">(<\/span>i<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>rdtemp<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token comment\">\/\/ \u63a5\u6536\u6570\u636e<\/span><br \/>\n<span class=\"token keyword\">char<\/span> buf<span class=\"token punctuation\">[<\/span><span class=\"token number\">10<\/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 comment\">\/\/ \u4e00\u6b21\u53ea\u80fd\u63a5\u653610\u4e2a\u5b57\u8282, \u5ba2\u6237\u7aef\u4e00\u6b21\u53d1\u9001100\u4e2a\u5b57\u8282<\/span><br \/>\n<span class=\"token comment\">\/\/ \u4e00\u6b21\u662f\u63a5\u6536\u4e0d\u5b8c\u7684, \u6587\u4ef6\u63cf\u8ff0\u7b26\u5bf9\u5e94\u7684\u8bfb\u7f13\u51b2\u533a\u4e2d\u8fd8\u6709\u6570\u636e<\/span><br \/>\n<span class=\"token comment\">\/\/ \u4e0b\u4e00\u8f6eselect\u68c0\u6d4b\u7684\u65f6\u5019, \u5185\u6838\u8fd8\u4f1a\u6807\u8bb0\u8fd9\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\u7f13\u51b2\u533a\u6709\u6570\u636e -&gt; \u518d\u8bfb\u4e00\u6b21<\/span><br \/>\n<span class=\"token comment\">\/\/\u5faa\u73af\u4f1a\u4e00\u76f4\u6301\u7eed, \u77e5\u9053\u7f13\u51b2\u533a\u6570\u636e\u88ab\u8bfb\u5b8c\u4f4d\u7f6e<\/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>i<span class=\"token punctuation\">,<\/span> buf<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>buf<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 number\">0<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<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\u5173\u95ed\u4e86\u8fde\u63a5&#8230;\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token comment\">\/\/ \u5c06\u68c0\u6d4b\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u4ece\u8bfb\u96c6\u5408\u4e2d\u5220\u9664<\/span><br \/>\n<span class=\"token function\">FD_CLR<\/span><span class=\"token punctuation\">(<\/span>i<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>rdset<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>i<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n<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><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token comment\">\/\/ \u6536\u5230\u4e86\u6570\u636e<\/span><br \/>\n        <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u5ba2\u6237\u7aefsay: %s\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> buf<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token comment\">\/\/ \u53d1\u9001\u6570\u636e<\/span><br \/>\n<span class=\"token function\">write<\/span><span class=\"token punctuation\">(<\/span>i<span class=\"token punctuation\">,<\/span> buf<span class=\"token punctuation\">,<\/span> <span class=\"token function\">strlen<\/span><span class=\"token punctuation\">(<\/span>buf<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 keyword\">else<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token comment\">\/\/ \u5f02\u5e38<\/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 punctuation\">}<\/span><br \/>\n<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>iSocketServer<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>\u5ba2\u6237\u7aef\u4ee3\u7801\u4e0e\u4e4b\u524d\u4e00\u6837<\/p>\n<h2>\u4e94\u3001IO\u591a\u8def\u8f6c\u63a5&#xff08;\u590d\u7528&#xff09;poll<\/h2>\n<p>poll\u7684\u673a\u5236\u4e0eselect\u7c7b\u4f3c&#xff0c;\u4e0eselect\u5728\u672c\u8d28\u4e0a\u6ca1\u6709\u591a\u5927\u5dee\u522b&#xff0c;\u4f7f\u7528\u65b9\u6cd5\u4e5f\u7c7b\u4f3c&#xff1a;<\/p>\n<ul>\n<li>\u5185\u6838\u5bf9\u5e94\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u68c0\u6d4b\u4e5f\u662f\u4ee5\u7ebf\u6027\u7684\u65b9\u5f0f\u8fdb\u884c\u8f6e\u8be2&#xff0c;\u6839\u636e\u63cf\u8ff0\u7b26\u7684\u72b6\u6001\u8fdb\u884c\u5904\u7406&#xff1b;<\/li>\n<li>poll\u548cselect\u68c0\u6d4b\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u96c6\u5408\u4f1a\u5728\u68c0\u6d4b\u8fc7\u7a0b\u4e2d\u9891\u7e41\u7684\u8fdb\u884c\u7528\u6237\u533a\u548c\u5185\u6838\u533a\u7684\u62f7\u8d1d&#xff0c;\u5b83\u7684\u5f00\u9500\u968f\u7740\u6587\u4ef6\u63cf\u8ff0\u7b26\u6570\u91cf\u7684\u589e\u52a0\u800c\u7ebf\u6027\u589e\u5927&#xff0c;\u4ece\u800c\u6548\u7387\u4e5f\u4f1a\u8d8a\u6765\u8d8a\u4f4e&#xff1b;<\/li>\n<\/ul>\n<p>\u4e0d\u540c\u70b9&#xff1a;<\/p>\n<ul>\n<li>select\u68c0\u6d4b\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u4e2a\u6570\u4e0a\u9650\u662f1024&#xff0c;poll\u6ca1\u6709\u6700\u5927\u6587\u4ef6\u63cf\u8ff0\u7b26\u6570\u91cf\u7684\u9650\u5236&#xff1b;<\/li>\n<li>select\u53ef\u4ee5\u8de8\u5e73\u53f0\u4f7f\u7528&#xff0c;poll\u53ea\u80fd\u5728Linux\u5e73\u53f0\u4f7f\u7528&#xff1b;<\/li>\n<\/ul>\n<p>poll\u51fd\u6570\u7684\u51fd\u6570\u539f\u578b\u5982\u4e0b&#xff1a;<\/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;poll.h&gt;<\/span><\/span><br \/>\n<span class=\"token comment\">\/\/ \u6bcf\u4e2a\u59d4\u6258poll\u68c0\u6d4b\u7684fd\u90fd\u5bf9\u5e94\u8fd9\u6837\u4e00\u4e2a\u7ed3\u6784\u4f53<\/span><br \/>\n<span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">pollfd<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">int<\/span>   fd<span class=\"token punctuation\">;<\/span>         <span class=\"token comment\">\/* \u59d4\u6258\u5185\u6838\u68c0\u6d4b\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26 *\/<\/span><br \/>\n    <span class=\"token keyword\">short<\/span> events<span class=\"token punctuation\">;<\/span>     <span class=\"token comment\">\/* \u59d4\u6258\u5185\u6838\u68c0\u6d4b\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u4ec0\u4e48\u4e8b\u4ef6 *\/<\/span><br \/>\n    <span class=\"token keyword\">short<\/span> revents<span class=\"token punctuation\">;<\/span>    <span class=\"token comment\">\/* \u6587\u4ef6\u63cf\u8ff0\u7b26\u5b9e\u9645\u53d1\u751f\u7684\u4e8b\u4ef6 -&gt; \u4f20\u51fa *\/<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">pollfd<\/span> myfd<span class=\"token punctuation\">[<\/span><span class=\"token number\">100<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> <span class=\"token function\">poll<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">pollfd<\/span> <span class=\"token operator\">*<\/span>fds<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">nfds_t<\/span> nfds<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> timeout<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u51fd\u6570\u53c2\u6570&#xff1a;<\/p>\n<ul>\n<li>\n<p>fds: \u8fd9\u662f\u4e00\u4e2a struct pollfd\u7c7b\u578b\u7684\u6570\u7ec4, \u91cc\u8fb9\u5b58\u50a8\u4e86\u5f85\u68c0\u6d4b\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u4fe1\u606f&#xff0c;\u8fd9\u4e2a\u6570\u7ec4\u4e2d\u6709\u4e09\u4e2a\u6210\u5458&#xff1a;<\/p>\n<ul>\n<li>fd&#xff1a;\u59d4\u6258\u5185\u6838\u68c0\u6d4b\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26<\/li>\n<li>events&#xff1a;\u59d4\u6258\u5185\u6838\u68c0\u6d4b\u7684fd\u4e8b\u4ef6&#xff08;\u8f93\u5165\u3001\u8f93\u51fa\u3001\u9519\u8bef&#xff09;&#xff0c;\u6bcf\u4e00\u4e2a\u4e8b\u4ef6\u6709\u591a\u4e2a\u53d6\u503c<\/li>\n<li>revents&#xff1a;\u8fd9\u662f\u4e00\u4e2a\u4f20\u51fa\u53c2\u6570&#xff0c;\u6570\u636e\u7531\u5185\u6838\u5199\u5165&#xff0c;\u5b58\u50a8\u5185\u6838\u68c0\u6d4b\u4e4b\u540e\u7684\u7ed3\u679c <img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/05\/20250523231615-683101bfdc72d.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/li>\n<\/ul>\n<\/li>\n<li>\n<p>nfds: \u8fd9\u662f\u7b2c\u4e00\u4e2a\u53c2\u6570\u6570\u7ec4\u4e2d\u6700\u540e\u4e00\u4e2a\u6709\u6548\u5143\u7d20\u7684\u4e0b\u6807 &#043; 1&#xff08;\u4e5f\u53ef\u4ee5\u6307\u5b9a\u53c2\u65701\u6570\u7ec4\u7684\u5143\u7d20\u603b\u4e2a\u6570&#xff09;<\/p>\n<\/li>\n<li>\n<p>timeout: \u6307\u5b9apoll\u51fd\u6570\u7684\u963b\u585e\u65f6\u957f<\/p>\n<ul>\n<li>-1&#xff1a;\u4e00\u76f4\u963b\u585e&#xff0c;\u76f4\u5230\u68c0\u6d4b\u7684\u96c6\u5408\u4e2d\u6709\u5c31\u7eea\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26&#xff08;\u6709\u4e8b\u4ef6\u4ea7\u751f&#xff09;\u89e3\u9664\u963b\u585e<\/li>\n<li>0&#xff1a;\u4e0d\u963b\u585e&#xff0c;\u4e0d\u7ba1\u68c0\u6d4b\u96c6\u5408\u4e2d\u6709\u6ca1\u6709\u5df2\u5c31\u7eea\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26&#xff0c;\u51fd\u6570\u9a6c\u4e0a\u8fd4\u56de<\/li>\n<li>\u5927\u4e8e0&#xff1a;\u963b\u585e\u6307\u5b9a\u7684\u6beb\u79d2&#xff08;ms&#xff09;\u6570\u4e4b\u540e&#xff0c;\u89e3\u9664\u963b\u585e<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>\u51fd\u6570\u8fd4\u56de\u503c&#xff1a;<\/p>\n<ul>\n<li>\u5931\u8d25&#xff1a; \u8fd4\u56de-1<\/li>\n<li>\u6210\u529f&#xff1a;\u8fd4\u56de\u4e00\u4e2a\u5927\u4e8e0\u7684\u6574\u6570&#xff0c;\u8868\u793a\u68c0\u6d4b\u7684\u96c6\u5408\u4e2d\u5df2\u5c31\u7eea\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u603b\u4e2a\u6570<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>\u670d\u52a1\u5668\u4ee3\u7801&#xff1a;<\/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;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><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;sys\/select.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;poll.h&gt;<\/span><\/span><\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name\">SERVER_PORT<\/span> <span class=\"token expression\"><span class=\"token number\">8080<\/span><\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name\">BACKLOG<\/span>     <span class=\"token expression\"><span class=\"token number\">10<\/span><\/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><span class=\"token operator\">*<\/span>argv<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">int<\/span> iSocketServer<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> iSocketClient<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr_in<\/span> tSocketServerAddr<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr_in<\/span> tSocketClientAddr<span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> iRet<span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/* 1. socket *\/<\/span><br \/>\niSocketServer <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> <\/p>\n<p>tSocketServerAddr<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 \/>\ntSocketServerAddr<span class=\"token punctuation\">.<\/span>sin_family      <span class=\"token operator\">&#061;<\/span> AF_INET<span class=\"token punctuation\">;<\/span><br \/>\ntSocketServerAddr<span class=\"token punctuation\">.<\/span>sin_port    <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">htons<\/span><span class=\"token punctuation\">(<\/span>SERVER_PORT<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token function\">memset<\/span><span class=\"token punctuation\">(<\/span>tSocketServerAddr<span class=\"token punctuation\">.<\/span>sin_zero<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">8<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/* 2. bind   *\/<\/span><br \/>\niRet <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">bind<\/span><span class=\"token punctuation\">(<\/span>iSocketServer<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">const<\/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>tSocketServerAddr<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\">sockaddr_in<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/* 3. listen *\/<\/span><br \/>\niRet <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">listen<\/span><span class=\"token punctuation\">(<\/span>iSocketServer<span class=\"token punctuation\">,<\/span> BACKLOG<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u68c0\u6d4b -&gt; \u8bfb\u7f13\u51b2\u533a, \u59d4\u6258\u5185\u6838\u53bb\u5904\u7406<\/span><br \/>\n<span class=\"token comment\">\/\/ \u6570\u636e\u521d\u59cb\u5316, \u521b\u5efa\u81ea\u5b9a\u4e49\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u96c6<\/span><br \/>\n<span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">pollfd<\/span> fds<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 comment\">\/\/ \u521d\u59cb\u5316<\/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> <span class=\"token number\">1024<\/span><span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\nfds<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><br \/>\nfds<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>events <span class=\"token operator\">&#061;<\/span> POLLIN<span class=\"token punctuation\">;<\/span><br \/>\n<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 punctuation\">.<\/span>fd <span class=\"token operator\">&#061;<\/span> iSocketServer<span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> maxfd <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><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><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token comment\">\/\/ \u59d4\u6258\u5185\u6838\u68c0\u6d4b<\/span><br \/>\niRet <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">poll<\/span><span class=\"token punctuation\">(<\/span>fds<span class=\"token punctuation\">,<\/span> maxfd <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">1<\/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 keyword\">if<\/span><span class=\"token punctuation\">(<\/span>iRet <span class=\"token operator\">&#061;&#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 function\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;poll&#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 number\">0<\/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\">\/\/ \u5185\u6838\u68c0\u6d4b\u4e4b\u540e\u7684\u7ed3\u679c\u4e3a\u771f<\/span><br \/>\n<span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>fds<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>revents <span class=\"token operator\">&amp;<\/span> POLLIN<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token comment\">\/\/ \u63a5\u6536\u8fde\u63a5\u8bf7\u6c42<\/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>tSocketClientAddr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token comment\">\/\/ \u8fd9\u4e2aaccept\u662f\u4e0d\u4f1a\u963b\u585e\u7684<\/span><br \/>\n<span class=\"token keyword\">int<\/span> iSocketClient <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">accept<\/span><span class=\"token punctuation\">(<\/span>iSocketServer<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>tSocketClientAddr<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 comment\">\/\/ \u59d4\u6258\u5185\u6838\u68c0\u6d4biSocketClient\u7684\u8bfb\u7f13\u51b2\u533a<\/span><br \/>\n<span class=\"token keyword\">int<\/span> i<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">for<\/span><span class=\"token punctuation\">(<\/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> <span class=\"token number\">1024<\/span><span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/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>fds<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><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\nfds<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>fd <span class=\"token operator\">&#061;<\/span> iSocketClient<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><br \/>\nmaxfd <span class=\"token operator\">&#061;<\/span> i <span class=\"token operator\">&gt;<\/span> maxfd <span class=\"token operator\">?<\/span> i <span class=\"token operator\">:<\/span> maxfd<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u901a\u4fe1, \u6709\u5ba2\u6237\u7aef\u53d1\u9001\u6570\u636e\u8fc7\u6765<\/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\">1<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;&#061;<\/span> maxfd<span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token comment\">\/\/ \u5982\u679c\u5728\u96c6\u5408\u4e2d, \u8bf4\u660e\u8bfb\u7f13\u51b2\u533a\u6709\u6570\u636e<\/span><br \/>\n<span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>fds<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>revents <span class=\"token operator\">&amp;<\/span> POLLIN<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">char<\/span> buf<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\">int<\/span> ret <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">read<\/span><span class=\"token punctuation\">(<\/span>fds<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>fd<span class=\"token punctuation\">,<\/span> buf<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>buf<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><br \/>\n<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 number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token keyword\">else<\/span> <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>ret <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u5bf9\u65b9\u5df2\u7ecf\u5173\u95ed\u4e86\u8fde\u63a5&#8230;\\\\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>fds<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>fd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nfds<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><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token keyword\">else<\/span><br \/>\n<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\u7aefsay: %s\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> buf<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token function\">write<\/span><span class=\"token punctuation\">(<\/span>fds<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>fd<span class=\"token punctuation\">,<\/span> buf<span class=\"token punctuation\">,<\/span> <span class=\"token function\">strlen<\/span><span class=\"token punctuation\">(<\/span>buf<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 punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>iSocketServer<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>\u5ba2\u6237\u7aef\u4ee3\u7801\u4e0e\u4e4b\u524d\u4e00\u6837<\/p>\n<h2>\u516d\u3001IO\u591a\u8def\u8f6c\u63a5&#xff08;\u590d\u7528&#xff09;epoll<\/h2>\n<p>epoll \u5168\u79f0 eventpoll&#xff0c;\u662f linux \u5185\u6838\u5b9e\u73b0IO\u591a\u8def\u8f6c\u63a5\/\u590d\u7528&#xff08;IO multiplexing&#xff09;\u7684\u4e00\u4e2a\u5b9e\u73b0\u3002IO\u591a\u8def\u8f6c\u63a5\u7684\u610f\u601d\u662f\u5728\u4e00\u4e2a\u64cd\u4f5c\u91cc\u540c\u65f6\u76d1\u542c\u591a\u4e2a\u8f93\u5165\u8f93\u51fa\u6e90&#xff0c;\u5728\u5176\u4e2d\u4e00\u4e2a\u6216\u591a\u4e2a\u8f93\u5165\u8f93\u51fa\u6e90\u53ef\u7528\u7684\u65f6\u5019\u8fd4\u56de&#xff0c;\u7136\u540e\u5bf9\u5176\u7684\u8fdb\u884c\u8bfb\u5199\u64cd\u4f5c\u3002epoll\u662fselect\u548cpoll\u7684\u5347\u7ea7\u7248&#xff0c;\u76f8\u8f83\u4e8e\u8fd9\u4e24\u4e2a\u524d\u8f88&#xff0c;epoll\u6539\u8fdb\u4e86\u5de5\u4f5c\u65b9\u5f0f&#xff0c;\u56e0\u6b64\u5b83\u66f4\u52a0\u9ad8\u6548\u3002<\/p>\n<ul>\n<li>\u5bf9\u4e8e\u5f85\u68c0\u6d4b\u96c6\u5408select\u548cpoll\u662f\u57fa\u4e8e\u7ebf\u6027\u65b9\u5f0f\u5904\u7406\u7684&#xff0c;epoll\u662f\u57fa\u4e8e\u7ea2\u9ed1\u6811\u6765\u7ba1\u7406\u5f85\u68c0\u6d4b\u96c6\u5408\u7684\u3002<\/li>\n<li>select\u548cpoll\u6bcf\u6b21\u90fd\u4f1a\u7ebf\u6027\u626b\u63cf\u6574\u4e2a\u5f85\u68c0\u6d4b\u96c6\u5408&#xff0c;\u96c6\u5408\u8d8a\u5927\u901f\u5ea6\u8d8a\u6162&#xff0c;epoll\u4f7f\u7528\u7684\u662f\u56de\u8c03\u673a\u5236&#xff0c;\u6548\u7387\u9ad8&#xff0c;\u5904\u7406\u6548\u7387\u4e5f\u4e0d\u4f1a\u968f\u7740\u68c0\u6d4b\u96c6\u5408\u7684\u53d8\u5927\u800c\u4e0b\u964d<\/li>\n<li>select\u548cpoll\u5de5\u4f5c\u8fc7\u7a0b\u4e2d\u5b58\u5728\u5185\u6838\/\u7528\u6237\u7a7a\u95f4\u6570\u636e\u7684\u9891\u7e41\u62f7\u8d1d\u95ee\u9898&#xff0c;\u5728epoll\u4e2d\u5185\u6838\u548c\u7528\u6237\u533a\u4f7f\u7528\u7684\u662f\u5171\u4eab\u5185\u5b58&#xff08;\u57fa\u4e8emmap\u5185\u5b58\u6620\u5c04\u533a\u5b9e\u73b0&#xff09;&#xff0c;\u7701\u53bb\u4e86\u4e0d\u5fc5\u8981\u7684\u5185\u5b58\u62f7\u8d1d\u3002<\/li>\n<li>\u7a0b\u5e8f\u733f\u9700\u8981\u5bf9select\u548cpoll\u8fd4\u56de\u7684\u96c6\u5408\u8fdb\u884c\u5224\u65ad\u624d\u80fd\u77e5\u9053\u54ea\u4e9b\u6587\u4ef6\u63cf\u8ff0\u7b26\u662f\u5c31\u7eea\u7684&#xff0c;\u901a\u8fc7epoll\u53ef\u4ee5\u76f4\u63a5\u5f97\u5230\u5df2\u5c31\u7eea\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u96c6\u5408&#xff0c;\u65e0\u9700\u518d\u6b21\u68c0\u6d4b<\/li>\n<li>\u4f7f\u7528epoll\u6ca1\u6709\u6700\u5927\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u9650\u5236&#xff0c;\u4ec5\u53d7\u7cfb\u7edf\u4e2d\u8fdb\u7a0b\u80fd\u6253\u5f00\u7684\u6700\u5927\u6587\u4ef6\u6570\u76ee\u9650\u5236<\/li>\n<\/ul>\n<p>\u5f53\u591a\u8def\u590d\u7528\u7684\u6587\u4ef6\u6570\u91cf\u5e9e\u5927\u3001IO\u6d41\u91cf\u9891\u7e41\u7684\u65f6\u5019&#xff0c;\u4e00\u822c\u4e0d\u592a\u9002\u5408\u4f7f\u7528select()\u548cpoll()&#xff0c;\u8fd9\u79cd\u60c5\u51b5\u4e0bselect()\u548cpoll()\u8868\u73b0\u8f83\u5dee&#xff0c;\u63a8\u8350\u4f7f\u7528epoll()\u3002<\/p>\n<p>\u5728epoll\u4e2d\u4e00\u5171\u63d0\u4f9b\u662f\u4e09\u4e2aAPI\u51fd\u6570&#xff0c;\u5206\u522b\u5904\u7406\u4e0d\u540c\u7684\u64cd\u4f5c&#xff0c;\u51fd\u6570\u539f\u578b\u5982\u4e0b&#xff1a;<\/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\/epoll.h&gt;<\/span><\/span><br \/>\n<span class=\"token comment\">\/\/ \u521b\u5efaepoll\u5b9e\u4f8b&#xff0c;\u901a\u8fc7\u4e00\u68f5\u7ea2\u9ed1\u6811\u7ba1\u7406\u5f85\u68c0\u6d4b\u96c6\u5408<\/span><br \/>\n<span class=\"token keyword\">int<\/span> <span class=\"token function\">epoll_create<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> size<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token comment\">\/\/ \u7ba1\u7406\u7ea2\u9ed1\u6811\u4e0a\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26(\u6dfb\u52a0\u3001\u4fee\u6539\u3001\u5220\u9664)<\/span><br \/>\n<span class=\"token keyword\">int<\/span> <span class=\"token function\">epoll_ctl<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> epfd<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> op<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> fd<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">epoll_event<\/span> <span class=\"token operator\">*<\/span>event<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token comment\">\/\/ \u68c0\u6d4bepoll\u6811\u4e2d\u662f\u5426\u6709\u5c31\u7eea\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26<\/span><br \/>\n<span class=\"token keyword\">int<\/span> <span class=\"token function\">epoll_wait<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> epfd<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">epoll_event<\/span> <span class=\"token operator\">*<\/span> events<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> maxevents<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> timeout<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u670d\u52a1\u5668\u4ee3\u7801&#xff1a;<\/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;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;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\/stat.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;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;sys\/socket.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\/epoll.h&gt;<\/span><\/span><\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name\">SERVER_PORT<\/span> <span class=\"token expression\"><span class=\"token number\">8888<\/span><\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name\">BACKLOG<\/span>     <span class=\"token expression\"><span class=\"token number\">10<\/span><\/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><span class=\"token operator\">*<\/span>argv<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">int<\/span> iSocketServer<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> iSocketClient<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr_in<\/span> tSocketServerAddr<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr_in<\/span> tSocketClientAddr<span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> iRet<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> iAddrlen<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> iClientNum <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> cnt <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> iRcvLen<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> iSendLen<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">char<\/span> ucSendBuf<span class=\"token punctuation\">[<\/span><span class=\"token number\">1000<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">char<\/span> ucRcvBuf<span class=\"token punctuation\">[<\/span><span class=\"token number\">1000<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/* 1. socket *\/<\/span><br \/>\niSocketServer <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> <\/p>\n<p>tSocketServerAddr<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 \/>\ntSocketServerAddr<span class=\"token punctuation\">.<\/span>sin_family      <span class=\"token operator\">&#061;<\/span> AF_INET<span class=\"token punctuation\">;<\/span><br \/>\ntSocketServerAddr<span class=\"token punctuation\">.<\/span>sin_port    <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">htons<\/span><span class=\"token punctuation\">(<\/span>SERVER_PORT<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token function\">memset<\/span><span class=\"token punctuation\">(<\/span>tSocketServerAddr<span class=\"token punctuation\">.<\/span>sin_zero<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">8<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u8bbe\u7f6e\u7aef\u53e3\u590d\u7528<\/span><br \/>\n<span class=\"token keyword\">int<\/span> opt <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>iSocketServer<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>opt<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>opt<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>iRet <span class=\"token operator\">&#061;&#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 function\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;bind error&#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 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. bind   *\/<\/span><br \/>\niRet <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">bind<\/span><span class=\"token punctuation\">(<\/span>iSocketServer<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">const<\/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>tSocketServerAddr<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\">sockaddr_in<\/span><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>iRet <span class=\"token operator\">&#061;&#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 function\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;listen error&#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 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. listen *\/<\/span><br \/>\niRet <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">listen<\/span><span class=\"token punctuation\">(<\/span>iSocketServer<span class=\"token punctuation\">,<\/span> BACKLOG<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u73b0\u5728\u53ea\u6709\u76d1\u542c\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26<\/span><br \/>\n<span class=\"token comment\">\/\/ \u6240\u6709\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u5bf9\u5e94\u8bfb\u5199\u7f13\u51b2\u533a\u72b6\u6001\u90fd\u662f\u59d4\u6258\u5185\u6838\u8fdb\u884c\u68c0\u6d4b\u7684epoll<\/span><br \/>\n<span class=\"token comment\">\/\/ \u521b\u5efa\u4e00\u4e2aepoll\u6a21\u578b<\/span><br \/>\n<span class=\"token keyword\">int<\/span> epfd <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">epoll_create<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">100<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>epfd <span class=\"token operator\">&#061;&#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 function\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;epoll_create&#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 number\">0<\/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\">\/\/ \u5f80epoll\u5b9e\u4f8b\u4e2d\u6dfb\u52a0\u9700\u8981\u68c0\u6d4b\u7684\u8282\u70b9, \u73b0\u5728\u53ea\u6709\u76d1\u542c\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26<\/span><br \/>\n<span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">epoll_event<\/span> ev<span class=\"token punctuation\">;<\/span><br \/>\nev<span class=\"token punctuation\">.<\/span>events <span class=\"token operator\">&#061;<\/span> EPOLLIN<span class=\"token punctuation\">;<\/span><span class=\"token comment\">\/\/ \u68c0\u6d4b iSocketServer \u7684\u8bfb\u7f13\u51b2\u533a\u662f\u5426\u6709\u6570\u636e<\/span><br \/>\nev<span class=\"token punctuation\">.<\/span>data<span class=\"token punctuation\">.<\/span>fd <span class=\"token operator\">&#061;<\/span> iSocketServer<span class=\"token punctuation\">;<\/span><br \/>\niRet <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">epoll_ctl<\/span><span class=\"token punctuation\">(<\/span>epfd<span class=\"token punctuation\">,<\/span> EPOLL_CTL_ADD<span class=\"token punctuation\">,<\/span> iSocketServer<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>ev<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>iRet <span class=\"token operator\">&#061;&#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 function\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;epoll_ctl&#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 number\">0<\/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\">epoll_event<\/span> evs<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> size <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>evs<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">\/<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">epoll_event<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u6301\u7eed\u68c0\u6d4b<\/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><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token comment\">\/\/ \u8c03\u7528\u4e00\u6b21, \u68c0\u6d4b\u4e00\u6b21<\/span><br \/>\n<span class=\"token keyword\">int<\/span> num <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">epoll_wait<\/span><span class=\"token punctuation\">(<\/span>epfd<span class=\"token punctuation\">,<\/span> evs<span class=\"token punctuation\">,<\/span> size<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 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> num<span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token comment\">\/\/ \u53d6\u51fa\u5f53\u524d\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26<\/span><br \/>\n<span class=\"token keyword\">int<\/span> curfd <span class=\"token operator\">&#061;<\/span> evs<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>data<span class=\"token punctuation\">.<\/span>fd<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token comment\">\/\/ \u5224\u65ad\u8fd9\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\u662f\u4e0d\u662f\u7528\u4e8e\u76d1\u542c\u7684<\/span><br \/>\n<span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>curfd <span class=\"token operator\">&#061;&#061;<\/span> iSocketServer<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token comment\">\/* 4. accept *\/<\/span><br \/>\niSocketClient <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">accept<\/span><span class=\"token punctuation\">(<\/span>curfd<span class=\"token punctuation\">,<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token comment\">\/\/ \u65b0\u5f97\u5230\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u6dfb\u52a0\u5230epoll\u6a21\u578b\u4e2d, \u4e0b\u4e00\u8f6e\u5faa\u73af\u7684\u65f6\u5019\u5c31\u53ef\u4ee5\u88ab\u68c0\u6d4b\u4e86<\/span><br \/>\nev<span class=\"token punctuation\">.<\/span>events <span class=\"token operator\">&#061;<\/span> EPOLLIN<span class=\"token punctuation\">;<\/span><span class=\"token comment\">\/\/ \u8bfb\u7f13\u51b2\u533a\u662f\u5426\u6709\u6570\u636e<\/span><br \/>\nev<span class=\"token punctuation\">.<\/span>data<span class=\"token punctuation\">.<\/span>fd <span class=\"token operator\">&#061;<\/span> iSocketClient<span class=\"token punctuation\">;<\/span><br \/>\niRet <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">epoll_ctl<\/span><span class=\"token punctuation\">(<\/span>epfd<span class=\"token punctuation\">,<\/span> EPOLL_CTL_ADD<span class=\"token punctuation\">,<\/span> iSocketClient<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>ev<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>iRet <span class=\"token operator\">&#061;&#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 function\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;epoll_ctl-accept&#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 number\">0<\/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><br \/>\n<span class=\"token keyword\">else<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token comment\">\/\/ \u5904\u7406\u901a\u4fe1\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26<\/span><br \/>\n<span class=\"token comment\">\/\/ \u63a5\u6536\u6570\u636e<\/span><br \/>\n<span class=\"token keyword\">char<\/span> buf<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 function\">memset<\/span><span class=\"token punctuation\">(<\/span>buf<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>buf<span class=\"token punctuation\">)<\/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>curfd<span class=\"token punctuation\">,<\/span> buf<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>buf<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 number\">0<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<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\u4e86\u8fde\u63a5\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token comment\">\/\/ \u5c06\u8fd9\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\u4eceepoll\u6a21\u578b\u4e2d\u5220\u9664<\/span><br \/>\n<span class=\"token function\">epoll_ctl<\/span><span class=\"token punctuation\">(<\/span>epfd<span class=\"token punctuation\">,<\/span> EPOLL_CTL_DEL<span class=\"token punctuation\">,<\/span> curfd<span class=\"token punctuation\">,<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>curfd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n<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><br \/>\n<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\u7aefsay: %s\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> buf<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token function\">send<\/span><span class=\"token punctuation\">(<\/span>curfd<span class=\"token punctuation\">,<\/span> buf<span class=\"token punctuation\">,<\/span> len<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 punctuation\">}<\/span><br \/>\n<span class=\"token keyword\">else<\/span><br \/>\n<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 function\">exit<\/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 punctuation\">}<\/span><br \/>\n<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\">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\u4e0e\u4e4b\u524d\u4e00\u6837<\/p>\n<p>\u5f53\u5728\u670d\u52a1\u5668\u7aef\u5faa\u73af\u8c03\u7528epoll_wait()\u7684\u65f6\u5019&#xff0c;\u4f1a\u5f97\u5230\u4e00\u4e2a\u5c31\u7eea\u5217\u8868&#xff0c;\u5e76\u901a\u8fc7\u8be5\u51fd\u6570\u7684\u7b2c\u4e8c\u4e2a\u53c2\u6570\u4f20\u51fa&#xff1a;<\/p>\n<p><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">epoll_event<\/span> evs<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 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