{"id":102929,"date":"2026-09-09T18:01:31","date_gmt":"2026-09-09T10:01:31","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/102929.html"},"modified":"2026-09-09T18:01:31","modified_gmt":"2026-09-09T10:01:31","slug":"%e3%80%90linux%e5%ba%94%e7%94%a8%e8%bd%af%e4%bb%b6%e7%bc%96%e7%a8%8b%e3%80%91tcp%e5%b9%b6%e5%8f%91%e6%9c%8d%e5%8a%a1%e5%99%a8","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/102929.html","title":{"rendered":"\u3010linux\u5e94\u7528\u8f6f\u4ef6\u7f16\u7a0b\u3011TCP\u5e76\u53d1\u670d\u52a1\u5668"},"content":{"rendered":"<\/p>\n<h4>\u6587\u7ae0\u76ee\u5f55<\/h4>\n<ul>\n<li>\n<ul>\n<li>\u4e00\u3001TCP\u5e76\u53d1\u670d\u52a1\u5668<\/li>\n<li>\u4e8c\u3001\u591a\u8fdb\u7a0b\u65b9\u5f0f\u6784\u5efa\u5e76\u53d1\u670d\u52a1\u5668<\/li>\n<li>\u4e09\u3001\u7ebf\u7a0b\u6c60\u65b9\u5f0f\u6784\u5efa\u5e76\u53d1\u670d\u52a1\u5668<\/li>\n<li>\u56db\u3001IO\u591a\u8def\u590d\u7528\u6784\u5efa\u5e76\u53d1\u670d\u52a1\u5668<\/li>\n<li>\n<ul>\n<li>4.1 select\u5b9e\u73b0<\/li>\n<li>\n<ul>\n<li>4.1.1 select<\/li>\n<li>4.1.2 select\u57fa\u7840\u4f7f\u7528\u4ee3\u7801\u793a\u4f8b&#xff1a;<\/li>\n<li>4.1.3 select\u5b9e\u73b0TCP\u5e76\u53d1\u670d\u52a1\u5668<\/li>\n<\/ul>\n<\/li>\n<li>4.2 poll<\/li>\n<li>4.3 epoll\u5b9e\u73b0<\/li>\n<li>\n<ul>\n<li>4.3.1 epoll_create<\/li>\n<li>4.3.2 epoll_ctl<\/li>\n<li>4.3.3 epoll_wait<\/li>\n<li>4.3.4 \u57fa\u7840\u4f7f\u7528\u4ee3\u7801\u793a\u4f8b<\/li>\n<li>4.3.5 epoll\u5b9e\u73b0TCP\u5e76\u53d1\u670d\u52a1\u5668<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/09\/20260909100129-6aa12e79d8c7a.png\" alt=\"\u8bf7\u6dfb\u52a0\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h3>\u4e00\u3001TCP\u5e76\u53d1\u670d\u52a1\u5668<\/h3>\n<p>\u5355\u5faa\u73af\u670d\u52a1\u5668&#xff1a;\u53ea\u80fd\u5904\u7406\u4e00\u4e2a\u5ba2\u6237\u7aef\u4efb\u52a1\u7684\u670d\u52a1\u5668&#xff1b; \u5e76\u53d1\u670d\u52a1\u5668&#xff1a;\u53ef\u4ee5\u5904\u7406\u591a\u4e2a\u5ba2\u6237\u7aef\u4efb\u52a1\u7684\u670d\u52a1\u5668&#xff08;\u4e00\u5bf9\u591a&#xff09;\u3002<\/p>\n<p>UDP\u670d\u52a1\u7aef&#xff1a;\u672c\u8d28\u4e0a\u76f4\u63a5\u5c31\u5177\u5907\u5e76\u53d1\u6027\u80fd\u3002 TCP\u670d\u52a1\u7aef&#xff1a;\u5fc5\u987b\u5efa\u7acb\u8fde\u63a5&#xff0c;\u6240\u4ee5\u4e0d\u5177\u5907\u5e76\u53d1\u6027\u80fd\u3002<\/p>\n<p>TCP\u5e76\u53d1\u670d\u52a1\u5668\u7684\u5b9e\u73b0\u65b9\u5f0f&#xff1a;<\/p>\n<ul>\n<li>\u591a\u8fdb\u7a0b \u8fdb\u7a0b\u8d44\u6e90\u5f00\u9500\u5927&#xff0c;\u5728\u6709\u9650\u5e73\u53f0\u4e0b&#xff0c;\u5e76\u53d1\u91cf\u6bd4\u8f83\u5c0f\u3002<\/li>\n<li>\u591a\u7ebf\u7a0b \u8d44\u6e90\u5f00\u9500\u5c0f&#xff0c;\u5728\u76f8\u540c\u5e73\u53f0\u4e0b&#xff0c;\u5e76\u53d1\u91cf\u6bd4\u591a\u8fdb\u7a0b\u591a\u3002<\/li>\n<li>\u7ebf\u7a0b\u6c60 \u591a\u7ebf\u7a0b\u6a21\u578b\u5728\u5ba2\u6237\u7aef\u5efa\u7acb\u8fde\u63a5\u65f6&#xff0c;\u521b\u5efa\u7ebf\u7a0b\u548c\u9500\u6bc1\u7ebf\u7a0b\u6709\u65f6\u95f4\u6d88\u8017\u3002 \u751f\u4ea7\u8005-\u6d88\u8d39\u8005\u8bbe\u8ba1\u6a21\u5f0f \u4e3b\u7ebf\u7a0b&#xff1a;\u751f\u4ea7\u4efb\u52a1 \u7ebf\u7a0b\u6c60&#xff1a;\u6267\u884c\u4efb\u52a1 \u4efb\u52a1\u961f\u5217<\/li>\n<li>IO\u591a\u8def\u590d\u7528 \u5728\u4e0d\u521b\u5efa\u65b0\u8fdb\u7a0b\/\u7ebf\u7a0b\u7684\u524d\u63d0\u4e0b&#xff0c;\u4f7f\u7528\u4e00\u4e2a\u8fdb\u7a0b\u540c\u65f6\u68c0\u6d4b\u591a\u8defIO\u3002 IO&#xff1a;\u5bf9\u6587\u4ef6\u8bfb\u5199<\/li>\n<\/ul>\n<h3>\u4e8c\u3001\u591a\u8fdb\u7a0b\u65b9\u5f0f\u6784\u5efa\u5e76\u53d1\u670d\u52a1\u5668<\/h3>\n<li>socket<\/li>\n<li>bind<\/li>\n<li>listen<\/li>\n<li>connfd &#061; accept<\/li>\n<li>\u521b\u5efa\u591a\u4e2a\u8fdb\u7a0bpid &#061; fork<\/li>\n<li>recv<\/li>\n<li>send<\/li>\n<p>\u4ee3\u7801\u793a\u4f8b&#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\">&#034;head.h&#034;<\/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\">SER_PORT<\/span> <span class=\"token expression\"><span class=\"token number\">50000<\/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\">SER_IP<\/span>   <span class=\"token string\">&#034;192.168.0.152&#034;<\/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\">MAX_CLI_CNT<\/span> <span class=\"token expression\"><span class=\"token number\">100<\/span><\/span><\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">init_tcp_ser<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">int<\/span> sockfd <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">socket<\/span><span class=\"token punctuation\">(<\/span>AF_INET<span class=\"token punctuation\">,<\/span> SOCK_STREAM<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>sockfd <span class=\"token operator\">&lt;<\/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\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;socket error&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">return<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr_in<\/span> seraddr<span class=\"token punctuation\">;<\/span><br \/>\nseraddr<span class=\"token punctuation\">.<\/span>sin_family <span class=\"token operator\">&#061;<\/span> AF_INET<span class=\"token punctuation\">;<\/span><br \/>\nseraddr<span class=\"token punctuation\">.<\/span>sin_port <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">htons<\/span><span class=\"token punctuation\">(<\/span>SER_PORT<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nseraddr<span class=\"token punctuation\">.<\/span>sin_addr<span class=\"token punctuation\">.<\/span>s_addr <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">inet_addr<\/span><span class=\"token punctuation\">(<\/span>SER_IP<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> ret <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">bind<\/span><span class=\"token punctuation\">(<\/span>sockfd<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr<\/span> <span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">&amp;<\/span>seraddr<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>seraddr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>ret <span class=\"token operator\">&lt;<\/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\">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 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>ret <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">listen<\/span><span class=\"token punctuation\">(<\/span>sockfd<span class=\"token punctuation\">,<\/span> MAX_CLI_CNT<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;<\/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\">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 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\">return<\/span> sockfd<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\">void<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">int<\/span> sockfd <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">init_tcp_ser<\/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>sockfd <span class=\"token operator\">&lt;<\/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\">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 keyword\">struct<\/span> <span class=\"token class-name\">sockaddr_in<\/span> cliaddr<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token class-name\">socklen_t<\/span> clilen <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>cliaddr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/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 keyword\">int<\/span> connfd <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">accept<\/span><span class=\"token punctuation\">(<\/span>sockfd<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>connfd <span class=\"token operator\">&lt;<\/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\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;accept error&#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\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;[%s : %d] get online\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">inet_ntoa<\/span><span class=\"token punctuation\">(<\/span>cliaddr<span class=\"token punctuation\">.<\/span>sin_addr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">ntohs<\/span><span class=\"token punctuation\">(<\/span>cliaddr<span class=\"token punctuation\">.<\/span>sin_port<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><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\">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><span class=\"token number\">0<\/span> <span class=\"token operator\">&#061;&#061;<\/span> pid<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token comment\">\/\/connfd&#8211;&gt;cli<\/span><br \/>\n<span class=\"token keyword\">char<\/span> buff<span class=\"token punctuation\">[<\/span><span class=\"token number\">1024<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token function\">memset<\/span><span class=\"token punctuation\">(<\/span>buff<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>buff<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token class-name\">ssize_t<\/span> size <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">recv<\/span><span class=\"token punctuation\">(<\/span>connfd<span class=\"token punctuation\">,<\/span> buff<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>buff<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>size <span class=\"token operator\">&lt;<\/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\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;recv error&#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>connfd<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\">else<\/span> <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span> <span class=\"token operator\">&#061;&#061;<\/span> size<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>connfd<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;[%s : %d] %s\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">inet_ntoa<\/span><span class=\"token punctuation\">(<\/span>cliaddr<span class=\"token punctuation\">.<\/span>sin_addr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">ntohs<\/span><span class=\"token punctuation\">(<\/span>cliaddr<span class=\"token punctuation\">.<\/span>sin_port<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> buff<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token function\">strcat<\/span><span class=\"token punctuation\">(<\/span>buff<span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;&#8212;-&gt;ok&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nsize <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">send<\/span><span class=\"token punctuation\">(<\/span>connfd<span class=\"token punctuation\">,<\/span> buff<span class=\"token punctuation\">,<\/span> <span class=\"token function\">strlen<\/span><span class=\"token punctuation\">(<\/span>buff<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>size <span class=\"token operator\">&lt;<\/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\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;send error&#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>connfd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><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><br \/>\n&#096;&#096;&#096;### \u591a\u7ebf\u7a0b\u65b9\u5f0f\u6784\u5efa\u5e76\u53d1\u670d\u52a1\u5668<br \/>\n<span class=\"token number\">1.<\/span> socket<br \/>\n<span class=\"token number\">2.<\/span> bind<br \/>\n<span class=\"token number\">3.<\/span> listen<br \/>\n<span class=\"token number\">4.<\/span> connfd <span class=\"token operator\">&#061;<\/span> accept<br \/>\n<span class=\"token number\">5.<\/span> \u5faa\u73af\u5efa\u7acb\u591a\u4e2a\u7ebf\u7a0bpthread_create<br \/>\n<span class=\"token number\">6.<\/span> recv<br \/>\n<span class=\"token number\">7.<\/span> send<br \/>\n\u4ee3\u7801\u793a\u4f8b&#xff1a;<\/p>\n<p>&#096;&#096;&#096;c<br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&#034;head.h&#034;<\/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\">SER_PORT<\/span> <span class=\"token expression\"><span class=\"token number\">50000<\/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\">SER_IP<\/span>   <span class=\"token string\">&#034;192.168.0.152&#034;<\/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\">MAX_CLI_CNT<\/span> <span class=\"token expression\"><span class=\"token number\">100<\/span><\/span><\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">init_tcp_ser<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">int<\/span> sockfd <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">socket<\/span><span class=\"token punctuation\">(<\/span>AF_INET<span class=\"token punctuation\">,<\/span> SOCK_STREAM<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>sockfd <span class=\"token operator\">&lt;<\/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\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;socket error&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">return<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr_in<\/span> seraddr<span class=\"token punctuation\">;<\/span><br \/>\nseraddr<span class=\"token punctuation\">.<\/span>sin_family <span class=\"token operator\">&#061;<\/span> AF_INET<span class=\"token punctuation\">;<\/span><br \/>\nseraddr<span class=\"token punctuation\">.<\/span>sin_port <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">htons<\/span><span class=\"token punctuation\">(<\/span>SER_PORT<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nseraddr<span class=\"token punctuation\">.<\/span>sin_addr<span class=\"token punctuation\">.<\/span>s_addr <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">inet_addr<\/span><span class=\"token punctuation\">(<\/span>SER_IP<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> ret <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">bind<\/span><span class=\"token punctuation\">(<\/span>sockfd<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr<\/span> <span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">&amp;<\/span>seraddr<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>seraddr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>ret <span class=\"token operator\">&lt;<\/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\">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 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>ret <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">listen<\/span><span class=\"token punctuation\">(<\/span>sockfd<span class=\"token punctuation\">,<\/span> MAX_CLI_CNT<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;<\/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\">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 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\">return<\/span> sockfd<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">void<\/span> <span class=\"token operator\">*<\/span><span class=\"token function\">do_comm<\/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\">int<\/span> connfd <span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">*<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> <span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span>arg<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token function\">free<\/span><span class=\"token punctuation\">(<\/span>arg<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token comment\">\/\/connfd&#8211;&gt;cli<\/span><br \/>\n<span class=\"token keyword\">char<\/span> buff<span class=\"token punctuation\">[<\/span><span class=\"token number\">1024<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token function\">memset<\/span><span class=\"token punctuation\">(<\/span>buff<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>buff<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token class-name\">ssize_t<\/span> size <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">recv<\/span><span class=\"token punctuation\">(<\/span>connfd<span class=\"token punctuation\">,<\/span> buff<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>buff<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>size <span class=\"token operator\">&lt;<\/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\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;recv error&#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>connfd<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\">else<\/span> <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span> <span class=\"token operator\">&#061;&#061;<\/span> size<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>connfd<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;%s\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> buff<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token function\">strcat<\/span><span class=\"token punctuation\">(<\/span>buff<span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;&#8212;-&gt;ok&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nsize <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">send<\/span><span class=\"token punctuation\">(<\/span>connfd<span class=\"token punctuation\">,<\/span> buff<span class=\"token punctuation\">,<\/span> <span class=\"token function\">strlen<\/span><span class=\"token punctuation\">(<\/span>buff<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>size <span class=\"token operator\">&lt;<\/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\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;send error&#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>connfd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token 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\">void<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token class-name\">pthread_t<\/span> tid<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> sockfd <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">init_tcp_ser<\/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>sockfd <span class=\"token operator\">&lt;<\/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\">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 keyword\">int<\/span> connfd <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr_in<\/span> cliaddr<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token class-name\">socklen_t<\/span> clilen <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>cliaddr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/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 \/>\nconnfd <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">accept<\/span><span class=\"token punctuation\">(<\/span>sockfd<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>connfd <span class=\"token operator\">&lt;<\/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\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;accept error&#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\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;[%s : %d] get online\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">inet_ntoa<\/span><span class=\"token punctuation\">(<\/span>cliaddr<span class=\"token punctuation\">.<\/span>sin_addr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">ntohs<\/span><span class=\"token punctuation\">(<\/span>cliaddr<span class=\"token punctuation\">.<\/span>sin_port<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> <span class=\"token operator\">*<\/span>pconnfd <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">malloc<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token operator\">*<\/span>pconnfd <span class=\"token operator\">&#061;<\/span> connfd<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>tid<span class=\"token punctuation\">,<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">,<\/span> do_comm<span class=\"token punctuation\">,<\/span> pconnfd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token function\">pthread_detach<\/span><span class=\"token punctuation\">(<\/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>sockfd<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<h3>\u4e09\u3001\u7ebf\u7a0b\u6c60\u65b9\u5f0f\u6784\u5efa\u5e76\u53d1\u670d\u52a1\u5668<\/h3>\n<p>\u591a\u7ebf\u7a0b\u6a21\u578b\u5728\u5ba2\u6237\u7aef\u5efa\u7acb\u8fde\u63a5\u65f6&#xff0c;\u521b\u5efa\u7ebf\u7a0b\u548c\u9500\u6bc1\u7ebf\u7a0b\u6709\u65f6\u95f4\u6d88\u8017\u3002 \u751f\u4ea7\u8005-\u6d88\u8d39\u8005\u8bbe\u8ba1\u6a21\u5f0f \u4e3b\u7ebf\u7a0b&#xff1a;\u751f\u4ea7\u4efb\u52a1 \u7ebf\u7a0b\u6c60&#xff1a;\u6267\u884c\u4efb\u52a1 \u4efb\u52a1\u961f\u5217 <img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/09\/20260909100130-6aa12e7a3de61.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h3>\u56db\u3001IO\u591a\u8def\u590d\u7528\u6784\u5efa\u5e76\u53d1\u670d\u52a1\u5668<\/h3>\n<p>\u5728\u4e0d\u521b\u5efa\u65b0\u8fdb\u7a0b\/\u7ebf\u7a0b\u7684\u524d\u63d0\u4e0b&#xff0c;\u4f7f\u7528\u4e00\u4e2a\u8fdb\u7a0b\u540c\u65f6\u68c0\u6d4b\u591a\u8defIO\u3002 IO&#xff1a;\u5bf9\u6587\u4ef6\u8bfb\u5199<\/p>\n<p>\u666e\u901a\u963b\u585e IO&#xff1a;fgets()\u3001read()\u8fd9\u7c7b\u8c03\u7528\u4f1a\u963b\u585e\u7ebf\u7a0b\u3002\u5982\u679c\u540c\u65f6\u76d1\u542c\u6807\u51c6\u8f93\u5165 fd&#061;0\u548c\u7ba1\u9053 fifofd\u4e24\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26&#xff0c;\u8c03\u7528fgets\u7b49\u5f85\u952e\u76d8\u8f93\u5165\u65f6&#xff0c;\u7ba1\u9053\u6765\u4e86\u6570\u636e\u4e5f\u6ca1\u6cd5\u5904\u7406&#xff1b;\u8c03\u7528read\u8bfb\u7ba1\u9053\u65f6&#xff0c;\u952e\u76d8\u8f93\u5165\u4e5f\u5904\u7406\u4e0d\u4e86&#xff0c;\u4e00\u4e2a\u7ebf\u7a0b\u53ea\u80fd\u5e72\u7b49\u5176\u4e2d\u4e00\u4e2a IO\u3002<\/p>\n<p>IO \u591a\u8def\u590d\u7528&#xff08;select\/poll\/epoll&#xff09;&#xff1a;\u628a\u591a\u4e2a fd \u4ea4\u7ed9\u5185\u6838\u53bb\u76d1\u63a7\u3002\u7ebf\u7a0b\u963b\u585e\u5728\u591a\u8def\u590d\u7528\u51fd\u6570\u4e0a&#xff0c;\u800c\u4e0d\u662f\u963b\u585e\u5728 read\/fgets \u4e0a\u3002\u5185\u6838\u68c0\u6d4b\u5230\u4efb\u610f\u4e00\u4e2a fd \u5c31\u7eea&#xff08;\u6709\u6570\u636e&#xff09;&#xff0c;\u5c31\u8fd4\u56de\u901a\u77e5\u7528\u6237\u6001&#xff0c;\u8fd9\u65f6\u7a0b\u5e8f\u518d\u53bb\u8c03\u7528read\/fgets\u8bfb\u53d6\u5bf9\u5e94 fd \u7684\u6570\u636e\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/09\/20260909100130-6aa12e7a5fea1.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/> 1. \u7528\u6237\u628aSTDIN_FILENO(0)\u3001fifofd\u4e24\u4e2a fd \u4ea4\u7ed9\u5185\u6838\u7684 IO \u591a\u8def\u590d\u7528\u6a21\u5757 2. \u8fdb\u7a0b\u963b\u585e\u5728 select\/poll\/epoll&#xff0c;\u4e0d\u963b\u585e\u5728 read\/fgets 3. \u5185\u6838\u76d1\u63a7\u8fd9\u4e24\u4e2a fd&#xff0c;\u5f53\u67d0\u4e2a fd \u6709\u6570\u636e\u5230\u8fbe&#xff0c;\u5524\u9192\u7528\u6237\u7a0b\u5e8f 4. \u7528\u6237\u7a0b\u5e8f\u518d\u5bf9\u5c31\u7eea\u7684 fd \u6267\u884cread()\/fgets()\u8bfb\u53d6\u6570\u636e\u3002<\/p>\n<p>\u5b9e\u73b0\u65b9\u5f0f&#xff1a; 1. select 2. poll 3. epoll<\/p>\n<p>\u5b9e\u73b0\u6d41\u7a0b&#xff1a;<\/p>\n<li>\u521b\u5efa\u6587\u4ef6\u63cf\u8ff0\u7b26\u96c6\u5408<\/li>\n<li>\u5c06\u5173\u6ce8\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u6dfb\u52a0\u5230\u96c6\u5408<\/li>\n<li>\u5c06\u6587\u4ef6\u63cf\u8ff0\u7b26\u4f20\u9012\u7ed9\u5185\u6838&#xff0c;\u5185\u6838\u5f00\u59cb\u68c0\u6d4bIO\u4e8b\u4ef6<\/li>\n<li>\u5185\u6838\u8fd4\u56de\u5230\u8fbe\u4e8b\u4ef6\u7684\u7ed3\u679c<\/li>\n<h4>4.1 select\u5b9e\u73b0<\/h4>\n<p>\u8f85\u52a9\u51fd\u6570&#xff08;\u5e26\u53c2\u5b8f&#xff09;&#xff1a;<\/p>\n<p><span class=\"token keyword\">void<\/span> <span class=\"token function\">FD_CLR<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> fd<span class=\"token punctuation\">,<\/span> fd_set <span class=\"token operator\">*<\/span>set<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n\u529f\u80fd&#xff1a;\u628a\u4e00\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\u4ece\u6587\u4ef6\u4e2d\u5220\u6389&#xff1b;<br \/>\n<span class=\"token keyword\">int<\/span>  <span class=\"token function\">FD_ISSET<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> fd<span class=\"token punctuation\">,<\/span> fd_set <span class=\"token operator\">*<\/span>set<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n\u529f\u80fd&#xff1a;\u5224\u65ad\u6587\u4ef6\u63cf\u8ff0\u7b26\u5728\u4e0d\u5728\u96c6\u5408\u91cc&#xff1b;<br \/>\n<span class=\"token keyword\">void<\/span> <span class=\"token function\">FD_SET<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> fd<span class=\"token punctuation\">,<\/span> fd_set <span class=\"token operator\">*<\/span>set<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n\u5c06\u6587\u4ef6\u63cf\u8ff0\u7b26\u52a0\u5165\u96c6\u5408\u91cc&#xff1b;<br \/>\n<span class=\"token keyword\">void<\/span> <span class=\"token function\">FD_ZERO<\/span><span class=\"token punctuation\">(<\/span>fd_set <span class=\"token operator\">*<\/span>set<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n\u529f\u80fd&#xff1a;\u96c6\u5408\u6e05\u96f6&#xff1b;<\/p>\n<h5>4.1.1 select<\/h5>\n<p>\u7279\u70b9&#xff1a;<\/p>\n<li>\u4f7f\u7528\u6570\u7ec4&#xff08;\u4f4d\u56fe&#xff09;\u4fdd\u5b58\u6587\u4ef6\u63cf\u8ff0\u7b26\u96c6\u5408&#xff0c;\u6700\u591a\u5141\u8bb8\u76d1\u6d4b1024\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26&#xff1b;<\/li>\n<li>\u5c06\u96c6\u5408\u8868\u521b\u5efa\u5728\u5e94\u7528\u5c42&#xff0c;\u5b58\u5728\u5e94\u7528\u5c42\u548c\u5185\u6838\u5c42\u6570\u636e\u7684\u53cd\u590d\u62f7\u8d1d&#xff0c;\u6d88\u8017\u65f6\u95f4&#xff1b;<\/li>\n<li>\u4e8b\u4ef6\u5230\u8fbe\u65f6&#xff0c;\u5185\u6838\u8fd4\u56de\u6574\u4e2a\u96c6\u5408\u8868&#xff0c;\u5e94\u7528\u5c42\u9700\u8981\u904d\u5386&#xff1b;<\/li>\n<li>select\u53ea\u80fd\u5de5\u4f5c\u5728\u6c34\u5e73\u89e6\u53d1\u6a21\u5f0f&#xff08;\u4f4e\u901f\u6a21\u5f0f&#xff09;&#xff0c;\u4e0d\u80fd\u5de5\u4f5c\u5728\u8fb9\u6cbf\u89e6\u53d1\u6a21\u5f0f&#xff08;\u9ad8\u901f\u6a21\u5f0f&#xff09;&#xff1b;<\/li>\n<ul>\n<li>\u51fd\u6570\u539f\u578b&#xff1a;<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;sys\/time.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;unistd.h&gt;<\/span><\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">select<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> nfds<span class=\"token punctuation\">,<\/span> fd_set <span class=\"token operator\">*<\/span>readfds<span class=\"token punctuation\">,<\/span> fd_set <span class=\"token operator\">*<\/span>writefds<span class=\"token punctuation\">,<\/span><br \/>\n           fd_set <span class=\"token operator\">*<\/span>exceptfds<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">timeval<\/span> <span class=\"token operator\">*<\/span>timeout<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\n <\/li>\n<li>\u529f\u80fd&#xff1a;\u5c06\u6587\u4ef6\u63cf\u8ff0\u7b26\u4f20\u9012\u7ed9\u5185\u6838\u5f00\u59cb\u76d1\u6d4bIO\u4e8b\u4ef6&#xff0c;\u5e76\u8fd4\u56de\u76d1\u6d4b\u5230\u7684\u7ed3\u679c\u3002<\/li>\n<li>\u53c2\u6570&#xff1a;\n<p>nfds&#xff1a;\u76d1\u6d4b\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u6700\u5927\u503c&#043;1&#xff1b; readfds&#xff1a;\u8981\u76d1\u6d4b\u7684\u8bfb\u4e8b\u4ef6\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u96c6\u5408\u7684\u5730\u5740&#xff1b; writefds&#xff1a;\u8981\u76d1\u6d4b\u7684\u5199\u4e8b\u4ef6\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u96c6\u5408\u7684\u5730\u5740&#xff1b; exceptfds&#xff1a;\u8981\u76d1\u6d4b\u7684\u51fa\u9519\u4e8b\u4ef6\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u96c6\u5408\u7684\u5730\u5740&#xff1b; timeout&#xff1a;\u8d85\u65f6\u65f6\u95f4\u7684\u5730\u5740\u3002&#xff08;NULL\u8868\u793a\u4e0d\u8bbe\u7f6e\u8d85\u65f6\u65f6\u95f4&#xff09;<\/p>\n<\/li>\n<li>\u8fd4\u56de\u503c&#xff1a;\n<p>\u6210\u529f&#xff1a;\u5b9e\u9645\u5230\u8fbe\u7684IO\u4e8b\u4ef6\u7684\u4e2a\u6570&#xff1b; \u5931\u8d25&#xff1a;-1&#xff1b; \u8fd4\u56de0&#xff1a;\u8bbe\u7f6e\u4e86\u8d85\u65f6\u4e8b\u4ef6&#xff0c;\u8d85\u65f6\u65f6\u95f4\u5230\u800c\u6ca1\u6709\u4e8b\u4ef6\u5230\u8fbe\u3002<\/p>\n<\/li>\n<\/ul>\n<h5>4.1.2 select\u57fa\u7840\u4f7f\u7528\u4ee3\u7801\u793a\u4f8b&#xff1a;<\/h5>\n<p>\u529f\u80fd\u8bf4\u660e<\/p>\n<ul>\n<li>\u5199\u7aef&#xff1a;\u521b\u5efa\u547d\u540d\u7ba1\u9053myfifo&#xff0c;\u4ee5\u53ea\u5199\u65b9\u5f0f\u6253\u5f00&#xff0c;\u6bcf\u9694 1 \u79d2\u5f80\u7ba1\u9053\u5199\u5165hello world\u3002<\/li>\n<li>\u8bfb\u7aef&#xff1a;\u4f7f\u7528select\u540c\u65f6\u76d1\u542c\u4e24\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26&#xff1a;\n<li>fifofd&#xff1a;\u547d\u540d\u7ba1\u9053&#xff0c;\u63a5\u6536\u5199\u7aef\u53d1\u6765\u7684\u6570\u636e<\/li>\n<li>STDIN_FILENO(0)&#xff1a;\u6807\u51c6\u8f93\u5165&#xff0c;\u8bfb\u53d6\u952e\u76d8\u8f93\u5165<\/li>\n<\/li>\n<\/ul>\n<p>\u5199\u7aef&#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\">&#034;head.h&#034;<\/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\">void<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token function\">mkfifo<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;myfifo&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0664<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>errno <span class=\"token operator\">!&#061;<\/span> EEXIST<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token function\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;mkfifo&#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 keyword\">int<\/span> fifofd <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">open<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;myfifo&#034;<\/span><span class=\"token punctuation\">,<\/span> O_WRONLY<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>fifofd <span class=\"token operator\">&lt;<\/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\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;open fifo error&#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 function\">write<\/span><span class=\"token punctuation\">(<\/span>fifofd<span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;hello world&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">11<\/span><span class=\"token punctuation\">)<\/span><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 \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>fifofd<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>\u8bfb\u7aef&#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\">&#034;head.h&#034;<\/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\">void<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">char<\/span> buff<span class=\"token punctuation\">[<\/span><span class=\"token number\">1024<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token function\">mkfifo<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;myfifo&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0664<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> fifofd <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">open<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;myfifo&#034;<\/span><span class=\"token punctuation\">,<\/span> O_RDONLY<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>fifofd <span class=\"token operator\">&lt;<\/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\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;open fifo error&#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>fd_set tmpfds<span class=\"token punctuation\">;<\/span><br \/>\nfd_set rdfds<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token function\">FD_ZERO<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>rdfds<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token function\">FD_SET<\/span><span class=\"token punctuation\">(<\/span>fifofd<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>rdfds<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> maxfd <span class=\"token operator\">&#061;<\/span> fifofd<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token function\">FD_SET<\/span><span class=\"token punctuation\">(<\/span>STDIN_FILENO<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>rdfds<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nmaxfd <span class=\"token operator\">&#061;<\/span> maxfd <span class=\"token operator\">&gt;<\/span> STDIN_FILENO <span class=\"token operator\">?<\/span> maxfd <span class=\"token operator\">:<\/span> STDIN_FILENO<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 \/>\ntmpfds <span class=\"token operator\">&#061;<\/span> rdfds<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> cnt <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>tmpfds<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 keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>cnt <span class=\"token operator\">&lt;<\/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\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;select eror&#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\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token function\">FD_ISSET<\/span><span class=\"token punctuation\">(<\/span>fifofd<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>tmpfds<span class=\"token punctuation\">)<\/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>buff<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>buff<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token comment\">\/\/read(fifofd, buff, sizeof(buff));<\/span><br \/>\n<span class=\"token class-name\">ssize_t<\/span> n <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">read<\/span><span class=\"token punctuation\">(<\/span>fifofd<span class=\"token punctuation\">,<\/span> buff<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>buff<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>n <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token function\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;read fifo error&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">FD_CLR<\/span><span class=\"token punctuation\">(<\/span>fifofd<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>rdfds<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>fifofd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token keyword\">else<\/span> <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>n <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token function\">FD_CLR<\/span><span class=\"token punctuation\">(<\/span>fifofd<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>rdfds<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>fifofd<span class=\"token punctuation\">)<\/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;FIFO : %s\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> buff<span class=\"token punctuation\">)<\/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><span class=\"token function\">FD_ISSET<\/span><span class=\"token punctuation\">(<\/span>STDIN_FILENO<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>tmpfds<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token function\">fgets<\/span><span class=\"token punctuation\">(<\/span>buff<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>buff<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token constant\">stdin<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;STDIN: %s\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> buff<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 function\">close<\/span><span class=\"token punctuation\">(<\/span>fifofd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h5>4.1.3 select\u5b9e\u73b0TCP\u5e76\u53d1\u670d\u52a1\u5668<\/h5>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&#034;head.h&#034;<\/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\">SER_PORT<\/span> <span class=\"token expression\"><span class=\"token number\">50000<\/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\">SER_IP<\/span>   <span class=\"token string\">&#034;192.168.0.152&#034;<\/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\">MAX_CLI_CNT<\/span> <span class=\"token expression\"><span class=\"token number\">100<\/span><\/span><\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">init_tcp_ser<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">int<\/span> sockfd <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">socket<\/span><span class=\"token punctuation\">(<\/span>AF_INET<span class=\"token punctuation\">,<\/span> SOCK_STREAM<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>sockfd <span class=\"token operator\">&lt;<\/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\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;socket error&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">return<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr_in<\/span> seraddr<span class=\"token punctuation\">;<\/span><br \/>\nseraddr<span class=\"token punctuation\">.<\/span>sin_family <span class=\"token operator\">&#061;<\/span> AF_INET<span class=\"token punctuation\">;<\/span><br \/>\nseraddr<span class=\"token punctuation\">.<\/span>sin_port <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">htons<\/span><span class=\"token punctuation\">(<\/span>SER_PORT<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nseraddr<span class=\"token punctuation\">.<\/span>sin_addr<span class=\"token punctuation\">.<\/span>s_addr <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">inet_addr<\/span><span class=\"token punctuation\">(<\/span>SER_IP<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> ret <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">bind<\/span><span class=\"token punctuation\">(<\/span>sockfd<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr<\/span> <span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">&amp;<\/span>seraddr<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>seraddr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>ret <span class=\"token operator\">&lt;<\/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\">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 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>ret <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">listen<\/span><span class=\"token punctuation\">(<\/span>sockfd<span class=\"token punctuation\">,<\/span> MAX_CLI_CNT<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;<\/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\">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 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\">return<\/span> sockfd<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\">void<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> sockfd <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">init_tcp_ser<\/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>sockfd <span class=\"token operator\">&lt;<\/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\">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 keyword\">char<\/span> buff<span class=\"token punctuation\">[<\/span><span class=\"token number\">1024<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr_in<\/span> cliaddr<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token class-name\">socklen_t<\/span> clilen <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>cliaddr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> maxfd <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>fd_set tmpfds<span class=\"token punctuation\">;<\/span><br \/>\nfd_set rdfds<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token function\">FD_ZERO<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>rdfds<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token function\">FD_SET<\/span><span class=\"token punctuation\">(<\/span>sockfd<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>rdfds<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nmaxfd <span class=\"token operator\">&#061;<\/span> sockfd<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 \/>\ntmpfds <span class=\"token operator\">&#061;<\/span> rdfds<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> cnt <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>tmpfds<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 keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>cnt <span class=\"token operator\">&lt;<\/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\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;select error&#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 keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> i <span class=\"token operator\">&#061;<\/span> sockfd<span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;&#061;<\/span> maxfd<span class=\"token punctuation\">;<\/span> <span class=\"token operator\">&#043;&#043;<\/span>i<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><span class=\"token function\">FD_ISSET<\/span><span class=\"token punctuation\">(<\/span>i<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>tmpfds<span class=\"token punctuation\">)<\/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> sockfd<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">int<\/span> connfd <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">accept<\/span><span class=\"token punctuation\">(<\/span>sockfd<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>connfd <span class=\"token operator\">&lt;<\/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\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;accept error&#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\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;[%s : %d] get online\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">inet_ntoa<\/span><span class=\"token punctuation\">(<\/span>cliaddr<span class=\"token punctuation\">.<\/span>sin_addr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">ntohs<\/span><span class=\"token punctuation\">(<\/span>cliaddr<span class=\"token punctuation\">.<\/span>sin_port<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token function\">FD_SET<\/span><span class=\"token punctuation\">(<\/span>connfd<span class=\"token punctuation\">,<\/span> <span class=\"token operator\">&amp;<\/span>rdfds<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nmaxfd <span class=\"token operator\">&#061;<\/span> maxfd <span class=\"token operator\">&gt;<\/span> connfd <span class=\"token operator\">?<\/span> maxfd <span class=\"token operator\">:<\/span> connfd<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\">memset<\/span><span class=\"token punctuation\">(<\/span>buff<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>buff<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token class-name\">ssize_t<\/span> size <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">recv<\/span><span class=\"token punctuation\">(<\/span>i<span class=\"token punctuation\">,<\/span> buff<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>buff<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>size <span class=\"token operator\">&lt;<\/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\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;recv error&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/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>rdfds<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 keyword\">continue<\/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><span class=\"token number\">0<\/span> <span class=\"token operator\">&#061;&#061;<\/span> size<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/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>rdfds<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 keyword\">continue<\/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;%s\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> buff<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token function\">strcat<\/span><span class=\"token punctuation\">(<\/span>buff<span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;&#8212;&gt;ok!&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nsize <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">send<\/span><span class=\"token punctuation\">(<\/span>i<span class=\"token punctuation\">,<\/span> buff<span class=\"token punctuation\">,<\/span> <span class=\"token function\">strlen<\/span><span class=\"token punctuation\">(<\/span>buff<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>size <span class=\"token operator\">&lt;<\/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\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;send error&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/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>rdfds<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 keyword\">continue<\/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 punctuation\">}<\/span><br \/>\n<span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>4.2 poll<\/h4>\n<p>\u7279\u70b9&#xff1a;<\/p>\n<li>\u4f7f\u7528\u94fe\u8868\u4fdd\u5b58\u6587\u4ef6\u63cf\u8ff0\u7b26\u96c6\u5408&#xff0c;\u7406\u8bba\u4e0a\u5141\u8bb8\u76d1\u6d4b\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u6ca1\u6709\u4e0a\u9650\u9650\u5236&#xff1b;<\/li>\n<li>\u521b\u5efa\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u96c6\u5408\u5728\u5e94\u7528\u5c42&#xff0c;\u9700\u8981\u5e94\u7528\u5c42\u548c\u5185\u6838\u5c42\u7684\u53cd\u590d\u6570\u636e\u62f7\u8d1d&#xff1b;<\/li>\n<li>\u5e94\u7528\u5c42\u5bf9\u4e8e\u8fd4\u56de\u7684\u4e8b\u4ef6\u7ed3\u679c\u9700\u8981\u904d\u5386\u67e5\u627e&#xff1b;<\/li>\n<li>\u53ea\u80fd\u5de5\u4f5c\u5728\u6c34\u5e73\u89e6\u53d1\u6a21\u5f0f&#xff08;\u4f4e\u901f&#xff09;&#xff0c;\u65e0\u6cd5\u5de5\u4f5c\u5728\u8fb9\u6cbf\u89e6\u53d1\u6a21\u5f0f&#xff08;\u9ad8\u901f&#xff09;\u3002<\/li>\n<h4>4.3 epoll\u5b9e\u73b0<\/h4>\n<p>\u7279\u70b9&#xff1a;<\/p>\n<li>\u4f7f\u7528\u6811\u5f62\u7ed3\u6784&#xff08;\u7ea2\u9ed1\u6811&#xff09;\u4fdd\u5b58\u6587\u4ef6\u63cf\u8ff0\u7b26\u96c6\u5408&#xff0c;\u65e0\u6587\u4ef6\u63cf\u8ff0\u7b26\u4e0a\u9650\u9650\u5236&#xff0c;\u5e76\u4e14\u67e5\u627e\u6548\u7387\u9ad8&#xff1b;<\/li>\n<li>\u6587\u4ef6\u63cf\u8ff0\u7b26\u96c6\u5408\u76f4\u63a5\u521b\u5efa\u5728\u5185\u6838\u5c42&#xff0c;\u907f\u514d\u4e86\u5e94\u7528\u5c42\u548c\u5185\u6838\u5c42\u7684\u53cd\u590d\u6570\u636e\u62f7\u8d1d&#xff1b;<\/li>\n<li>\u76f4\u63a5\u8fd4\u56de\u5230\u8fbe\u4e8b\u4ef6\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u96c6\u5408&#xff1b;<\/li>\n<li>\u53ef\u4ee5\u5de5\u4f5c\u5728\u6c34\u5e73\u89e6\u53d1\u6a21\u5f0f&#xff0c;\u4e5f\u53ef\u4ee5\u5de5\u4f5c\u5728\u8fb9\u6cbf\u89e6\u53d1\u6a21\u5f0f\u3002<\/li>\n<h5>4.3.1 epoll_create<\/h5>\n<ul>\n<li>\u51fd\u6570\u539f\u578b&#xff1a;<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 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>\n <\/li>\n<li>\u529f\u80fd&#xff1a;\n<p>\u521b\u5efa\u4e00\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u96c6\u5408\u3002<\/p>\n<\/li>\n<li>\u53c2\u6570&#xff1a;\n<p>size&#xff1a;\u5141\u8bb8\u76d1\u6d4b\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u4e2a\u6570&#xff1b;<\/p>\n<\/li>\n<li>\u8fd4\u56de\u503c&#xff1a;\n<p>\u6210\u529f&#xff1a;\u8fd4\u56de\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u53e5\u67c4&#xff1b; \u5931\u8d25&#xff1a;\u8fd4\u56de-1\u3002<\/p>\n<\/li>\n<\/ul>\n<h5>4.3.2 epoll_ctl<\/h5>\n<ul>\n<li>\u51fd\u6570\u539f\u578b&#xff1a;<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 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><br \/>\n<span class=\"token class-name\">epoll_event<\/span> <span class=\"token operator\">*<\/span>event<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\n <\/li>\n<li>\u529f\u80fd&#xff1a;\n<p>\u5bf9\u6587\u4ef6\u63cf\u8ff0\u7b26\u96c6\u5408\u4e2d\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u505a\u64cd\u4f5c\u3002<\/p>\n<\/li>\n<li>\u53c2\u6570&#xff1a;\n<p>epfd&#xff1a;epoll\u5efa\u7acb\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u96c6\u5408&#xff1b; op&#xff1a;\u64cd\u4f5c\u65b9\u6cd5&#xff1a; 1. EPOLL_CTL_ADD&#xff08;\u6dfb\u52a0&#xff09; 2. EPOLL_CTL_MOD&#xff08;\u4fee\u6539&#xff09; 3. EPOLL_CTL_DEL&#xff08;\u5220\u9664&#xff09; fd&#xff1a;\u8981\u64cd\u4f5c\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26&#xff1b; event&#xff1a;epoll\u4e8b\u4ef6\u7ed3\u6784\u4f53\u3002<\/p>\n<p>   <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">epoll_event<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token class-name\">uint32_t<\/span>     events<span class=\"token punctuation\">;<\/span>      <span class=\"token comment\">\/* Epoll events *\/<\/span><br \/>\n    <span class=\"token class-name\">epoll_data_t<\/span> data<span class=\"token punctuation\">;<\/span>        <span class=\"token comment\">\/* User data variable *\/<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">typedef<\/span> <span class=\"token keyword\">union<\/span> epoll_data <span class=\"token punctuation\">{<\/span><br \/>\n     <span class=\"token keyword\">void<\/span>        <span class=\"token operator\">*<\/span>ptr<span class=\"token punctuation\">;<\/span><br \/>\n     <span class=\"token keyword\">int<\/span>          fd<span class=\"token punctuation\">;<\/span><span class=\"token comment\">\/\/\u8981\u76d1\u6d4b\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26<\/span><br \/>\n     <span class=\"token class-name\">uint32_t<\/span>     u32<span class=\"token punctuation\">;<\/span><br \/>\n     <span class=\"token class-name\">uint64_t<\/span>     u64<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span> <span class=\"token class-name\">epoll_data_t<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>events&#xff1a;\u4e8b\u4ef6\u7c7b\u578b&#xff1a; 1. EPOLLIN&#xff1a;\u5199\u4e8b\u4ef6&#xff1b; 2. EPOLLOUT&#xff1a;\u8bfb\u4e8b\u4ef6\u3002<\/p>\n<\/li>\n<li>\u8fd4\u56de\u503c&#xff1a;\n<p>\u6210\u529f&#xff1a;\u8fd4\u56de\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u53e5\u67c4&#xff1b; \u5931\u8d25&#xff1a;\u8fd4\u56de-1\u3002<\/p>\n<\/li>\n<\/ul>\n<h5>4.3.3 epoll_wait<\/h5>\n<ul>\n<li>\u51fd\u6570\u539f\u578b&#xff1a;<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>\n<p><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><br \/>\n             <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>\n <\/li>\n<li>\u529f\u80fd&#xff1a;\n<p>\u901a\u77e5\u5185\u6838\u5f00\u59cb\u76d1\u6d4b\u4e8b\u4ef6\u3002<\/p>\n<\/li>\n<li>\u53c2\u6570&#xff1a;\n<p>epfd&#xff1a;\u76d1\u6d4b\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u96c6\u5408&#xff1b; events&#xff1a;\u4fdd\u5b58epoll\u8fd4\u56de\u7684\u5230\u8fbe\u4e8b\u4ef6\u7684\u96c6\u5408&#xff1b; maxevents&#xff1a;\u6700\u591a\u76d1\u6d4b\u7684\u4e8b\u4ef6\u4e2a\u6570&#xff1b; timeout&#xff1a;\u8bbe\u7f6e\u8d85\u65f6\u65f6\u95f4&#xff1b;&#xff08;-1&#xff1a;\u4e0d\u8bbe\u7f6e\u8d85\u65f6&#xff0c;\u963b\u585e\u7b49\u5f85&#xff09;<\/p>\n<\/li>\n<li>\u8fd4\u56de\u503c&#xff1a;\n<p>\u6210\u529f&#xff1a;\u8fd4\u56de\u5b9e\u9645\u5230\u8fbe\u4e8b\u4ef6\u7684\u4e2a\u6570&#xff1b; \u5931\u8d25&#xff1a;\u8fd4\u56de-1\u3002 \u8fd4\u56de0&#xff1a;\u8d85\u65f6\u65f6\u95f4\u5230\u8fbe&#xff0c;\u8fd4\u56de\u7684\u4e8b\u4ef6\u6570\u5f970.<\/p>\n<\/li>\n<\/ul>\n<h5>4.3.4 \u57fa\u7840\u4f7f\u7528\u4ee3\u7801\u793a\u4f8b<\/h5>\n<p>\u529f\u80fd\u8bf4\u660e<\/p>\n<ul>\n<li>\u5199\u7aef&#xff1a;\u521b\u5efa\u547d\u540d\u7ba1\u9053myfifo&#xff0c;\u4ee5\u53ea\u5199\u65b9\u5f0f\u6253\u5f00&#xff0c;\u6bcf\u9694 1 \u79d2\u5f80\u7ba1\u9053\u5199\u5165hello world\u3002<\/li>\n<li>\u8bfb\u7aef&#xff1a;\u4f7f\u7528select\u540c\u65f6\u76d1\u542c\u4e24\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26&#xff1a;\n<li>fifofd&#xff1a;\u547d\u540d\u7ba1\u9053&#xff0c;\u63a5\u6536\u5199\u7aef\u53d1\u6765\u7684\u6570\u636e<\/li>\n<li>STDIN_FILENO(0)&#xff1a;\u6807\u51c6\u8f93\u5165&#xff0c;\u8bfb\u53d6\u952e\u76d8\u8f93\u5165<\/li>\n<\/li>\n<\/ul>\n<p>\u5efa\u7acbfifo\u6587\u4ef6&#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\">&#034;head.h&#034;<\/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\">void<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token function\">mkfifo<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;myfifo&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0664<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> fifofd <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">open<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;myfifo&#034;<\/span><span class=\"token punctuation\">,<\/span> O_WRONLY<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>fifofd <span class=\"token operator\">&lt;<\/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\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;open fifo error&#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 function\">write<\/span><span class=\"token punctuation\">(<\/span>fifofd<span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;hello world&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">11<\/span><span class=\"token punctuation\">)<\/span><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 \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>fifofd<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>\u4f7f\u7528epoll\u8fbe\u5230IO\u591a\u8def\u590d\u7528&#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\">&#034;head.h&#034;<\/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\">MAX_FD_CNT<\/span> <span class=\"token expression\"><span class=\"token number\">2<\/span><\/span><\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">add_epoll_fd<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> epfds<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> fd<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">uint32_t<\/span> event<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\">epoll_event<\/span> ev<span class=\"token punctuation\">;<\/span><br \/>\nev<span class=\"token punctuation\">.<\/span>events <span class=\"token operator\">&#061;<\/span> event<span class=\"token punctuation\">;<\/span><br \/>\nev<span class=\"token punctuation\">.<\/span>data<span class=\"token punctuation\">.<\/span>fd <span class=\"token operator\">&#061;<\/span> fd<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> ret <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">epoll_ctl<\/span><span class=\"token punctuation\">(<\/span>epfds<span class=\"token punctuation\">,<\/span> EPOLL_CTL_ADD<span class=\"token punctuation\">,<\/span> fd<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>ret <span class=\"token operator\">&lt;<\/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\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;epoll_ctl error&#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 keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">delete_epoll_fd<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> epfds<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> fd<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\">epoll_ctl<\/span><span class=\"token punctuation\">(<\/span>epfds<span class=\"token punctuation\">,<\/span> EPOLL_CTL_DEL<span class=\"token punctuation\">,<\/span> fd<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 keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>ret <span class=\"token operator\">&lt;<\/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\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;epoll_ctl error&#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 keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">void<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">char<\/span> buff<span class=\"token punctuation\">[<\/span><span class=\"token number\">1024<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token function\">mkfifo<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;myfifo&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0664<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> fifofd <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">open<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;myfifo&#034;<\/span><span class=\"token punctuation\">,<\/span> O_RDONLY<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>fifofd <span class=\"token operator\">&lt;<\/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\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;open fifo error&#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\">int<\/span> epfds <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">epoll_create<\/span><span class=\"token punctuation\">(<\/span>MAX_FD_CNT<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>epfds <span class=\"token operator\">&lt;<\/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\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;epoll_create error&#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 function\">add_epoll_fd<\/span><span class=\"token punctuation\">(<\/span>epfds<span class=\"token punctuation\">,<\/span> fifofd<span class=\"token punctuation\">,<\/span> EPOLLIN<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token function\">add_epoll_fd<\/span><span class=\"token punctuation\">(<\/span>epfds<span class=\"token punctuation\">,<\/span> STDIN_FILENO<span class=\"token punctuation\">,<\/span> EPOLLIN<span class=\"token punctuation\">)<\/span><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>MAX_FD_CNT<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> cnt <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">epoll_wait<\/span><span class=\"token punctuation\">(<\/span>epfds<span class=\"token punctuation\">,<\/span> evs<span class=\"token punctuation\">,<\/span> MAX_FD_CNT<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>cnt <span class=\"token operator\">&lt;<\/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\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;epoll_wait error&#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 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> cnt<span class=\"token punctuation\">;<\/span> <span class=\"token operator\">&#043;&#043;<\/span>i<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>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 operator\">&#061;&#061;<\/span> fifofd<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>buff<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>buff<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token class-name\">ssize_t<\/span> size <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">read<\/span><span class=\"token punctuation\">(<\/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> buff<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>buff<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>size <span class=\"token operator\">&lt;<\/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\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;read fifo error&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token function\">delete_epoll_fd<\/span><span class=\"token punctuation\">(<\/span>epfds<span class=\"token punctuation\">,<\/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><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/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><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><span class=\"token number\">0<\/span> <span class=\"token operator\">&#061;&#061;<\/span> size<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token function\">delete_epoll_fd<\/span><span class=\"token punctuation\">(<\/span>epfds<span class=\"token punctuation\">,<\/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><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/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><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;FIFO : %s\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> buff<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>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 operator\">&#061;&#061;<\/span> STDIN_FILENO<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token function\">fgets<\/span><span class=\"token punctuation\">(<\/span>buff<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>buff<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token constant\">stdin<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;STDIN : %s\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> buff<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 punctuation\">}<\/span><\/p>\n<p><span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>fifofd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h5>4.3.5 epoll\u5b9e\u73b0TCP\u5e76\u53d1\u670d\u52a1\u5668<\/h5>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&#034;head.h&#034;<\/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\">SER_PORT<\/span> <span class=\"token expression\"><span class=\"token number\">50000<\/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\">SER_IP<\/span>   <span class=\"token string\">&#034;192.168.0.152&#034;<\/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\">MAX_CLI_CNT<\/span> <span class=\"token expression\"><span class=\"token number\">100<\/span><\/span><\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">init_tcp_ser<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">int<\/span> sockfd <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">socket<\/span><span class=\"token punctuation\">(<\/span>AF_INET<span class=\"token punctuation\">,<\/span> SOCK_STREAM<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>sockfd <span class=\"token operator\">&lt;<\/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\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;socket error&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">return<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr_in<\/span> seraddr<span class=\"token punctuation\">;<\/span><br \/>\nseraddr<span class=\"token punctuation\">.<\/span>sin_family <span class=\"token operator\">&#061;<\/span> AF_INET<span class=\"token punctuation\">;<\/span><br \/>\nseraddr<span class=\"token punctuation\">.<\/span>sin_port <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">htons<\/span><span class=\"token punctuation\">(<\/span>SER_PORT<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nseraddr<span class=\"token punctuation\">.<\/span>sin_addr<span class=\"token punctuation\">.<\/span>s_addr <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">inet_addr<\/span><span class=\"token punctuation\">(<\/span>SER_IP<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> ret <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">bind<\/span><span class=\"token punctuation\">(<\/span>sockfd<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">sockaddr<\/span> <span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span><span class=\"token operator\">&amp;<\/span>seraddr<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>seraddr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>ret <span class=\"token operator\">&lt;<\/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\">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 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>ret <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">listen<\/span><span class=\"token punctuation\">(<\/span>sockfd<span class=\"token punctuation\">,<\/span> MAX_CLI_CNT<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;<\/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\">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 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\">return<\/span> sockfd<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\">add_epoll_fd<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> epfds<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> fd<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">uint32_t<\/span> event<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\">epoll_event<\/span> ev<span class=\"token punctuation\">;<\/span><br \/>\nev<span class=\"token punctuation\">.<\/span>events <span class=\"token operator\">&#061;<\/span> event<span class=\"token punctuation\">;<\/span><br \/>\nev<span class=\"token punctuation\">.<\/span>data<span class=\"token punctuation\">.<\/span>fd <span class=\"token operator\">&#061;<\/span> fd<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> ret <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">epoll_ctl<\/span><span class=\"token punctuation\">(<\/span>epfds<span class=\"token punctuation\">,<\/span> EPOLL_CTL_ADD<span class=\"token punctuation\">,<\/span> fd<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>ret <span class=\"token operator\">&lt;<\/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\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;epoll_ctl add error&#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\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">delete_epoll_fd<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> epfds<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> fd<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\">epoll_ctl<\/span><span class=\"token punctuation\">(<\/span>epfds<span class=\"token punctuation\">,<\/span> EPOLL_CTL_DEL<span class=\"token punctuation\">,<\/span> fd<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 keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>ret <span class=\"token operator\">&lt;<\/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\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;epoll_ctl del error&#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 keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">void<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> sockfd <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">init_tcp_ser<\/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>sockfd <span class=\"token operator\">&lt;<\/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\">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 keyword\">struct<\/span> <span class=\"token class-name\">sockaddr_in<\/span> cliaddr<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token class-name\">socklen_t<\/span> clilen <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>cliaddr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> epfds <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">epoll_create<\/span><span class=\"token punctuation\">(<\/span>MAX_CLI_CNT<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>epfds <span class=\"token operator\">&lt;<\/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\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;epoll_create error&#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 function\">add_epoll_fd<\/span><span class=\"token punctuation\">(<\/span>epfds<span class=\"token punctuation\">,<\/span> sockfd<span class=\"token punctuation\">,<\/span> EPOLLIN<span class=\"token punctuation\">)<\/span><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>MAX_CLI_CNT<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">char<\/span> buff<span class=\"token punctuation\">[<\/span><span class=\"token number\">1024<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">int<\/span> cnt <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">epoll_wait<\/span><span class=\"token punctuation\">(<\/span>epfds<span class=\"token punctuation\">,<\/span> evs<span class=\"token punctuation\">,<\/span> MAX_CLI_CNT<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>cnt <span class=\"token operator\">&lt;<\/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\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;epoll_wait error&#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 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> cnt<span class=\"token punctuation\">;<\/span> <span class=\"token operator\">&#043;&#043;<\/span>i<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>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 operator\">&#061;&#061;<\/span> sockfd<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token keyword\">int<\/span> connfd <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">accept<\/span><span class=\"token punctuation\">(<\/span>sockfd<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>connfd <span class=\"token operator\">&lt;<\/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\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;accept error&#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\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;[%s : %d] get online\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">inet_ntoa<\/span><span class=\"token punctuation\">(<\/span>cliaddr<span class=\"token punctuation\">.<\/span>sin_addr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">ntohs<\/span><span class=\"token punctuation\">(<\/span>cliaddr<span class=\"token punctuation\">.<\/span>sin_port<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token function\">add_epoll_fd<\/span><span class=\"token punctuation\">(<\/span>epfds<span class=\"token punctuation\">,<\/span> connfd<span class=\"token punctuation\">,<\/span> EPOLLIN<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\">memset<\/span><span class=\"token punctuation\">(<\/span>buff<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>buff<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token class-name\">ssize_t<\/span> size <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">recv<\/span><span class=\"token punctuation\">(<\/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> buff<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>buff<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>size <span class=\"token operator\">&lt;<\/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\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;recv error&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token function\">delete_epoll_fd<\/span><span class=\"token punctuation\">(<\/span>epfds<span class=\"token punctuation\">,<\/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><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/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><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 keyword\">else<\/span> <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span> <span class=\"token operator\">&#061;&#061;<\/span> size<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token function\">delete_epoll_fd<\/span><span class=\"token punctuation\">(<\/span>epfds<span class=\"token punctuation\">,<\/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><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/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><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\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;%s\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> buff<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token function\">strcat<\/span><span class=\"token punctuation\">(<\/span>buff<span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;&#8212;&gt;ok!&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nsize <span class=\"token operator\">&#061;<\/span> <span 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