{"id":165,"date":"2026-03-24T13:53:46","date_gmt":"2026-03-24T05:53:46","guid":{"rendered":"https:\/\/codergodv.xyz\/?p=165"},"modified":"2026-03-24T13:53:47","modified_gmt":"2026-03-24T05:53:47","slug":"io%e5%a4%9a%e8%b7%af%e8%bd%ac%e6%8e%a5-select%e3%80%81poll%e3%80%81epoll","status":"publish","type":"post","link":"https:\/\/codergodv.xyz\/index.php\/2026\/03\/24\/io%e5%a4%9a%e8%b7%af%e8%bd%ac%e6%8e%a5-select%e3%80%81poll%e3%80%81epoll\/","title":{"rendered":"IO\u591a\u8def\u8f6c\u63a5 \u2014\u2014\u2014 select\u3001poll\u3001epoll"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">I\/O\u591a\u8def\u8f6c\u63a5\u4e4bselect<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">select\u521d\u8bc6<\/h3>\n\n\n\n<p>select\u662f\u7cfb\u7edf\u63d0\u4f9b\u7684\u4e00\u4e2a\u591a\u8def\u8f6c\u63a5\u63a5\u53e3\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>select\u7cfb\u7edf\u8c03\u7528\u53ef\u4ee5\u8ba9\u6211\u4eec\u7684\u7a0b\u5e8f\u540c\u65f6\u76d1\u89c6\u591a\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u4e0a\u7684\u4e8b\u4ef6\u662f\u5426\u5c31\u7eea\u3002<\/li>\n\n\n\n<li>select\u7684\u6838\u5fc3\u5de5\u4f5c\u5c31\u662f\u7b49\uff0c\u5f53\u76d1\u89c6\u7684\u591a\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\u4e2d\u6709\u4e00\u4e2a\u6216\u591a\u4e2a\u4e8b\u4ef6\u5c31\u7eea\u65f6\uff0cselect\u624d\u4f1a\u6210\u529f\u8fd4\u56de\u5e76\u5c06\u5bf9\u5e94\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u5c31\u7eea\u4e8b\u4ef6\u544a\u77e5\u8c03\u7528\u8005\u3002<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><a href=\"https:\/\/so.csdn.net\/so\/search?q=select\u51fd\u6570&amp;spm=1001.2101.3001.7020\">select\u51fd\u6570<\/a><\/h3>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>select\u51fd\u6570<\/p>\n<\/blockquote>\n\n\n\n<p>select\u51fd\u6570\u7684\u51fd\u6570\u539f\u578b\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>int select(int nfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds, struct timeval *timeout);<\/code><\/pre>\n\n\n\n<p>\u53c2\u6570\u8bf4\u660e\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>nfds\uff1a\u9700\u8981\u76d1\u89c6\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u4e2d\uff0c\u6700\u5927\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u503c+1\u3002<\/li>\n\n\n\n<li>readfds\uff1a\u8f93\u5165\u8f93\u51fa\u578b\u53c2\u6570\uff0c\u8c03\u7528\u65f6\u7528\u6237\u544a\u77e5\u5185\u6838\u9700\u8981\u76d1\u89c6\u54ea\u4e9b\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u8bfb\u4e8b\u4ef6\u662f\u5426\u5c31\u7eea\uff0c\u8fd4\u56de\u65f6\u5185\u6838\u544a\u77e5\u7528\u6237\u54ea\u4e9b\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u8bfb\u4e8b\u4ef6\u5df2\u7ecf\u5c31\u7eea\u3002<\/li>\n\n\n\n<li>writefds\uff1a\u8f93\u5165\u8f93\u51fa\u578b\u53c2\u6570\uff0c\u8c03\u7528\u65f6\u7528\u6237\u544a\u77e5\u5185\u6838\u9700\u8981\u76d1\u89c6\u54ea\u4e9b\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u5199\u4e8b\u4ef6\u662f\u5426\u5c31\u7eea\uff0c\u8fd4\u56de\u65f6\u5185\u6838\u544a\u77e5\u7528\u6237\u54ea\u4e9b\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u5199\u4e8b\u4ef6\u5df2\u7ecf\u5c31\u7eea\u3002<\/li>\n\n\n\n<li>exceptfds\uff1a\u8f93\u5165\u8f93\u51fa\u578b\u53c2\u6570\uff0c\u8c03\u7528\u65f6\u7528\u6237\u544a\u77e5\u5185\u6838\u9700\u8981\u76d1\u89c6\u54ea\u4e9b\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u5f02\u5e38\u4e8b\u4ef6\u662f\u5426\u5c31\u7eea\uff0c\u8fd4\u56de\u65f6\u5185\u6838\u544a\u77e5\u7528\u6237\u54ea\u4e9b\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u5f02\u5e38\u4e8b\u4ef6\u5df2\u7ecf\u5c31\u7eea\u3002<\/li>\n\n\n\n<li>timeout\uff1a\u8f93\u5165\u8f93\u51fa\u578b\u53c2\u6570\uff0c\u8c03\u7528\u65f6\u7531\u7528\u6237\u8bbe\u7f6eselect\u7684\u7b49\u5f85\u65f6\u95f4\uff0c\u8fd4\u56de\u65f6\u8868\u793atimeout\u7684\u5269\u4f59\u65f6\u95f4\u3002<\/li>\n<\/ul>\n\n\n\n<p>\u53c2\u6570timeout\u7684\u53d6\u503c\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>NULL\/nullptr\uff1aselect\u8c03\u7528\u540e\u8fdb\u884c\u963b\u585e\u7b49\u5f85\uff0c\u76f4\u5230\u88ab\u76d1\u89c6\u7684\u67d0\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\u4e0a\u7684\u67d0\u4e2a\u4e8b\u4ef6\u5c31\u7eea\u3002<\/li>\n\n\n\n<li>0\uff1aselec\u8c03\u7528\u540et\u8fdb\u884c\u975e\u963b\u585e\u7b49\u5f85\uff0c\u65e0\u8bba\u88ab\u76d1\u89c6\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u4e0a\u7684\u4e8b\u4ef6\u662f\u5426\u5c31\u7eea\uff0cselect\u68c0\u6d4b\u540e\u90fd\u4f1a\u7acb\u5373\u8fd4\u56de\u3002<\/li>\n\n\n\n<li>\u7279\u5b9a\u7684\u65f6\u95f4\u503c\uff1aselect\u8c03\u7528\u540e\u5728\u6307\u5b9a\u7684\u65f6\u95f4\u5185\u8fdb\u884c\u963b\u585e\u7b49\u5f85\uff0c\u5982\u679c\u88ab\u76d1\u89c6\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u4e0a\u4e00\u76f4\u6ca1\u6709\u4e8b\u4ef6\u5c31\u7eea\uff0c\u5219\u5728\u8be5\u65f6\u95f4\u540eselect\u8fdb\u884c\u8d85\u65f6\u8fd4\u56de\u3002<\/li>\n<\/ul>\n\n\n\n<p>\u8fd4\u56de\u503c\u8bf4\u660e\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5982\u679c\u51fd\u6570\u8c03\u7528\u6210\u529f\uff0c\u5219\u8fd4\u56de\u6709\u4e8b\u4ef6\u5c31\u7eea\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u4e2a\u6570\u3002<\/li>\n\n\n\n<li>\u5982\u679ctimeout\u65f6\u95f4\u8017\u5c3d\uff0c\u5219\u8fd4\u56de0\u3002<\/li>\n\n\n\n<li>\u5982\u679c\u51fd\u6570\u8c03\u7528\u5931\u8d25\uff0c\u5219\u8fd4\u56de-1\uff0c\u540c\u65f6\u9519\u8bef\u7801\u4f1a\u88ab\u8bbe\u7f6e\u3002<\/li>\n<\/ul>\n\n\n\n<p>select\u8c03\u7528\u5931\u8d25\u65f6\uff0c\u9519\u8bef\u7801\u53ef\u80fd\u88ab\u8bbe\u7f6e\u4e3a\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>EBADF<\/code>\uff1a\u6587\u4ef6\u63cf\u8ff0\u7b26\u4e3a\u65e0\u6548\u7684\u6216\u8be5\u6587\u4ef6\u5df2\u5173\u95ed\u3002<\/li>\n\n\n\n<li><code>EINTR<\/code>\uff1a\u6b64\u8c03\u7528\u88ab\u4fe1\u53f7\u6240\u4e2d\u65ad\u3002<\/li>\n\n\n\n<li><code>EINVAL<\/code>\uff1a\u53c2\u6570nfds\u4e3a\u8d1f\u503c\u3002<\/li>\n\n\n\n<li><code>ENOMEM<\/code>\uff1a\u6838\u5fc3\u5185\u5b58\u4e0d\u8db3\u3002<\/li>\n<\/ul>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p><a href=\"https:\/\/so.csdn.net\/so\/search?q=fd_set&amp;spm=1001.2101.3001.7020\">fd_set<\/a>\u7ed3\u6784<\/p>\n<\/blockquote>\n\n\n\n<p>fd_set\u7ed3\u6784\u4e0esigset_t\u7ed3\u6784\u7c7b\u4f3c\uff0cfd_set\u672c\u8d28\u4e5f\u662f\u4e00\u4e2a\u4f4d\u56fe\uff0c\u7528\u4f4d\u56fe\u4e2d\u5bf9\u5e94\u7684\u4f4d\u6765\u8868\u793a\u8981\u76d1\u89c6\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u3002<img decoding=\"async\" src=\"https:\/\/cdn.codergodv.xyz\/de3c8fa69ba040229c1ea421194a8bec.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"><\/p>\n\n\n\n<figure class=\"wp-block-image\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/cdn.codergodv.xyz\/e84f8ac889b79ff6df71f6d61c3e04f1.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/cdn.codergodv.xyz\/e84f8ac889b79ff6df71f6d61c3e04f1.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/div><\/figure>\n\n\n\n<p>\u8c03\u7528select\u51fd\u6570\u4e4b\u524d\u5c31\u9700\u8981\u7528fd_set\u7ed3\u6784\u5b9a\u4e49\u51fa\u5bf9\u5e94\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u96c6\uff0c\u7136\u540e\u5c06\u9700\u8981\u76d1\u89c6\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u6dfb\u52a0\u5230\u6587\u4ef6\u63cf\u8ff0\u7b26\u96c6\u5f53\u4e2d\uff0c\u8fd9\u4e2a\u6dfb\u52a0\u7684\u8fc7\u7a0b\u672c\u8d28\u5c31\u662f\u5728\u8fdb\u884c\u4f4d\u64cd\u4f5c\uff0c\u4f46\u662f\u8fd9\u4e2a\u4f4d\u64cd\u4f5c\u4e0d\u9700\u8981\u7528\u6237\u81ea\u5df1\u8fdb\u884c\uff0c\u7cfb\u7edf\u63d0\u4f9b\u4e86\u4e00\u7ec4\u4e13\u95e8\u7684\u63a5\u53e3\uff0c\u7528\u4e8e\u5bf9fd_set\u7c7b\u578b\u7684\u4f4d\u56fe\u8fdb\u884c\u5404\u79cd\u64cd\u4f5c\u3002<\/p>\n\n\n\n<p>\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>void FD_CLR(int fd, fd_set *set);      \/\/\u7528\u6765\u6e05\u9664\u63cf\u8ff0\u8bcd\u7ec4set\u4e2d\u76f8\u5173fd\u7684\u4f4d\nint  FD_ISSET(int fd, fd_set *set);    \/\/\u7528\u6765\u6d4b\u8bd5\u63cf\u8ff0\u8bcd\u7ec4set\u4e2d\u76f8\u5173fd\u7684\u4f4d\u662f\u5426\u4e3a\u771f\nvoid FD_SET(int fd, fd_set *set);      \/\/\u7528\u6765\u8bbe\u7f6e\u63cf\u8ff0\u8bcd\u7ec4set\u4e2d\u76f8\u5173fd\u7684\u4f4d\nvoid FD_ZERO(fd_set *set);             \/\/\u7528\u6765\u6e05\u9664\u63cf\u8ff0\u8bcd\u7ec4set\u7684\u5168\u90e8\u4f4d<\/code><\/pre>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p><a href=\"https:\/\/so.csdn.net\/so\/search?q=timeval&amp;spm=1001.2101.3001.7020\">timeval<\/a>\u7ed3\u6784<\/p>\n<\/blockquote>\n\n\n\n<p>\u4f20\u5165select\u51fd\u6570\u7684\u6700\u540e\u4e00\u4e2a\u53c2\u6570timeout\uff0c\u5c31\u662f\u4e00\u4e2a\u6307\u5411timeval\u7ed3\u6784\u7684\u6307\u9488\uff0ctimeval\u7ed3\u6784\u7528\u4e8e\u63cf\u8ff0\u4e00\u6bb5\u65f6\u95f4\u957f\u5ea6\uff0c\u8be5\u7ed3\u6784\u5f53\u4e2d\u5305\u542b\u4e24\u4e2a\u6210\u5458\uff0c\u5176\u4e2dtv_sec\u8868\u793a\u7684\u662f\u79d2\uff0ctv_usec\u8868\u793a\u7684\u662f\u5fae\u79d2\u3002<img decoding=\"async\" src=\"https:\/\/cdn.codergodv.xyz\/dc4cfaa489ab850a5f8da5934d49ecdb.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">socket\u5c31\u7eea\u6761\u4ef6<\/h3>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>\u8bfb\u5c31\u7eea<\/p>\n<\/blockquote>\n\n\n\n<ul class=\"wp-block-list\">\n<li>socket\u5185\u6838\u4e2d\uff0c\u63a5\u6536\u7f13\u51b2\u533a\u4e2d\u7684\u5b57\u8282\u6570\uff0c\u5927\u4e8e\u7b49\u4e8e\u4f4e\u6c34\u4f4d\u6807\u8bb0<code>SO_RCVLOWAT<\/code>\uff0c\u6b64\u65f6\u53ef\u4ee5\u65e0\u963b\u585e\u7684\u8bfb\u53d6\u8be5\u6587\u4ef6\u63cf\u8ff0\u7b26\uff0c\u5e76\u4e14\u8fd4\u56de\u503c\u5927\u4e8e0\u3002<\/li>\n\n\n\n<li>socket TCP\u901a\u4fe1\u4e2d\uff0c\u5bf9\u7aef\u5173\u95ed\u8fde\u63a5\uff0c\u6b64\u65f6\u5bf9\u8be5socket\u8bfb\uff0c\u5219\u8fd4\u56de0\u3002<\/li>\n\n\n\n<li>\u76d1\u542c\u7684socket\u4e0a\u6709\u65b0\u7684\u8fde\u63a5\u8bf7\u6c42\u3002<\/li>\n\n\n\n<li>socket\u4e0a\u6709\u672a\u5904\u7406\u7684\u9519\u8bef\u3002<\/li>\n<\/ul>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>\u5199\u5c31\u7eea<\/p>\n<\/blockquote>\n\n\n\n<ul class=\"wp-block-list\">\n<li>socket\u5185\u6838\u4e2d\uff0c\u53d1\u9001\u7f13\u51b2\u533a\u4e2d\u7684\u53ef\u7528\u5b57\u8282\u6570\uff0c\u5927\u4e8e\u7b49\u4e8e\u4f4e\u6c34\u4f4d\u6807\u8bb0<code>SO_SNDLOWAT<\/code>\uff0c\u6b64\u65f6\u53ef\u4ee5\u65e0\u963b\u585e\u7684\u5199\uff0c\u5e76\u4e14\u8fd4\u56de\u503c\u5927\u4e8e0\u3002<\/li>\n\n\n\n<li>socket\u7684\u5199\u64cd\u4f5c\u88ab\u5173\u95ed\uff08close\u6216\u8005shutdown\uff09\uff0c\u5bf9\u4e00\u4e2a\u5199\u64cd\u4f5c\u88ab\u5173\u95ed\u7684socket\u8fdb\u884c\u5199\u64cd\u4f5c\uff0c\u4f1a\u89e6\u53d1SIGPIPE\u4fe1\u53f7\u3002<\/li>\n\n\n\n<li>socket\u4f7f\u7528\u975e\u963b\u585econnect\u8fde\u63a5\u6210\u529f\u6216\u5931\u8d25\u4e4b\u540e\u3002<\/li>\n\n\n\n<li>socket\u4e0a\u6709\u672a\u8bfb\u53d6\u7684\u9519\u8bef\u3002<\/li>\n<\/ul>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>\u5f02\u5e38\u5c31\u7eea<\/p>\n<\/blockquote>\n\n\n\n<ul class=\"wp-block-list\">\n<li>socket\u4e0a\u6536\u5230\u5e26\u5916\u6570\u636e\u3002<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>\u6ce8\uff1a\u5e26\u5916\u6570\u636e\u548cTCP\u7684\u7d27\u6025\u6a21\u5f0f\u76f8\u5173\uff0cTCP\u62a5\u5934\u5f53\u4e2d\u7684URG\u6807\u5fd7\u4f4d\u548c16\u4f4d\u7d27\u6025\u6307\u9488\u642d\u914d\u4f7f\u7528\uff0c\u5c31\u80fd\u591f\u53d1\u9001\/\u63a5\u6536\u5e26\u5916\u6570\u636e\u3002<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">select\u57fa\u672c\u5de5\u4f5c\u6d41\u7a0b<\/h3>\n\n\n\n<p>\u5982\u679c\u6211\u4eec\u8981\u5b9e\u73b0\u4e00\u4e2a\u7b80\u5355\u7684select\u670d\u52a1\u5668\uff0c\u8be5\u670d\u52a1\u5668\u8981\u505a\u7684\u5c31\u662f\u8bfb\u53d6\u5ba2\u6237\u7aef\u53d1\u6765\u7684\u6570\u636e\u5e76\u8fdb\u884c\u6253\u5370\uff0c\u90a3\u4e48\u8fd9\u4e2aselect\u670d\u52a1\u5668\u7684\u5de5\u4f5c\u6d41\u7a0b\u5e94\u8be5\u662f\u8fd9\u6837\u7684\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5148\u521d\u59cb\u5316\u670d\u52a1\u5668\uff0c\u5b8c\u6210\u5957\u63a5\u5b57\u7684\u521b\u5efa\u3001\u7ed1\u5b9a\u548c\u76d1\u542c\u3002<\/li>\n\n\n\n<li>\u5b9a\u4e49\u4e00\u4e2afd_array\u6570\u7ec4\u7528\u4e8e\u4fdd\u5b58\u76d1\u542c\u5957\u63a5\u5b57\u548c\u5df2\u7ecf\u4e0e\u5ba2\u6237\u7aef\u5efa\u7acb\u8fde\u63a5\u7684\u5957\u63a5\u5b57\uff0c\u521a\u5f00\u59cb\u65f6\u5c31\u5c06\u76d1\u542c\u5957\u63a5\u5b57\u6dfb\u52a0\u5230fd_array\u6570\u7ec4\u5f53\u4e2d\u3002<\/li>\n\n\n\n<li>\u7136\u540e\u670d\u52a1\u5668\u5f00\u59cb\u5faa\u73af\u8c03\u7528select\u51fd\u6570\uff0c\u68c0\u6d4b\u8bfb\u4e8b\u4ef6\u662f\u5426\u5c31\u7eea\uff0c\u5982\u679c\u5c31\u7eea\u5219\u6267\u884c\u5bf9\u5e94\u7684\u64cd\u4f5c\u3002<\/li>\n\n\n\n<li>\u6bcf\u6b21\u8c03\u7528select\u51fd\u6570\u4e4b\u524d\uff0c\u90fd\u9700\u8981\u5b9a\u4e49\u4e00\u4e2a\u8bfb\u6587\u4ef6\u63cf\u8ff0\u7b26\u96c6readfds\uff0c\u5e76\u5c06fd_array\u5f53\u4e2d\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u4f9d\u6b21\u8bbe\u7f6e\u8fdbreadfds\u5f53\u4e2d\uff0c\u8868\u793a\u8ba9select\u5e2e\u6211\u4eec\u76d1\u89c6\u8fd9\u4e9b\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u8bfb\u4e8b\u4ef6\u662f\u5426\u5c31\u7eea\u3002<\/li>\n\n\n\n<li>\u5f53select\u68c0\u6d4b\u5230\u6570\u636e\u5c31\u7eea\u65f6\u4f1a\u5c06\u8bfb\u4e8b\u4ef6\u5c31\u7eea\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u8bbe\u7f6e\u8fdbreadfds\u5f53\u4e2d\uff0c\u6b64\u65f6\u6211\u4eec\u5c31\u80fd\u591f\u5f97\u77e5\u54ea\u4e9b\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u8bfb\u4e8b\u4ef6\u5c31\u7eea\u4e86\uff0c\u5e76\u5bf9\u8fd9\u4e9b\u6587\u4ef6\u63cf\u8ff0\u7b26\u8fdb\u884c\u5bf9\u5e94\u7684\u64cd\u4f5c\u3002<\/li>\n\n\n\n<li>\u5982\u679c\u8bfb\u4e8b\u4ef6\u5c31\u7eea\u7684\u662f\u76d1\u542c\u5957\u63a5\u5b57\uff0c\u5219\u8c03\u7528accept\u51fd\u6570\u4ece\u5e95\u5c42\u5168\u8fde\u63a5\u961f\u5217\u83b7\u53d6\u5df2\u7ecf\u5efa\u7acb\u597d\u7684\u8fde\u63a5\uff0c\u5e76\u5c06\u8be5\u8fde\u63a5\u5bf9\u5e94\u7684\u5957\u63a5\u5b57\u6dfb\u52a0\u5230fd_array\u6570\u7ec4\u5f53\u4e2d\u3002<\/li>\n\n\n\n<li>\u5982\u679c\u8bfb\u4e8b\u4ef6\u5c31\u7eea\u7684\u662f\u4e0e\u5ba2\u6237\u7aef\u5efa\u7acb\u8fde\u63a5\u7684\u5957\u63a5\u5b57\uff0c\u5219\u8c03\u7528read\u51fd\u6570\u8bfb\u53d6\u5ba2\u6237\u7aef\u53d1\u6765\u7684\u6570\u636e\u5e76\u8fdb\u884c\u6253\u5370\u8f93\u51fa\u3002<\/li>\n\n\n\n<li>\u5f53\u7136\uff0c\u670d\u52a1\u5668\u4e0e\u5ba2\u6237\u7aef\u5efa\u7acb\u8fde\u63a5\u7684\u5957\u63a5\u5b57\u8bfb\u4e8b\u4ef6\u5c31\u7eea\uff0c\u4e5f\u53ef\u80fd\u662f\u56e0\u4e3a\u5ba2\u6237\u7aef\u5c06\u8fde\u63a5\u5173\u95ed\u4e86\uff0c\u6b64\u65f6\u670d\u52a1\u5668\u5e94\u8be5\u8c03\u7528close\u5173\u95ed\u8be5\u5957\u63a5\u5b57\uff0c\u5e76\u5c06\u8be5\u5957\u63a5\u5b57\u4ecefd_array\u6570\u7ec4\u5f53\u4e2d\u6e05\u9664\uff0c\u56e0\u4e3a\u4e0b\u4e00\u6b21\u4e0d\u9700\u8981\u518d\u76d1\u89c6\u8be5\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u8bfb\u4e8b\u4ef6\u4e86\u3002<\/li>\n<\/ul>\n\n\n\n<p><strong>\u8bf4\u660e\u4e00\u4e0b\uff1a<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u56e0\u4e3a\u4f20\u5165select\u51fd\u6570\u7684readfds\u3001writefds\u548cexceptfds\u90fd\u662f\u8f93\u5165\u8f93\u51fa\u578b\u53c2\u6570\uff0c\u5f53select\u51fd\u6570\u8fd4\u56de\u65f6\u8fd9\u4e9b\u53c2\u6570\u5f53\u4e2d\u7684\u503c\u5df2\u7ecf\u88ab\u4fee\u6539\u4e86\uff0c\u56e0\u6b64\u6bcf\u6b21\u8c03\u7528select\u51fd\u6570\u65f6\u90fd\u9700\u8981\u5bf9\u5176\u8fdb\u884c\u91cd\u65b0\u8bbe\u7f6e\uff0ctimeout\u4e5f\u662f\u7c7b\u4f3c\u7684\u9053\u7406\u3002<\/li>\n\n\n\n<li>\u56e0\u4e3a\u6bcf\u6b21\u8c03\u7528select\u51fd\u6570\u4e4b\u524d\u90fd\u9700\u8981\u5bf9readfds\u8fdb\u884c\u91cd\u65b0\u8bbe\u7f6e\uff0c\u6240\u4ee5\u9700\u8981\u5b9a\u4e49\u4e00\u4e2afd_array\u6570\u7ec4\u4fdd\u5b58\u4e0e\u5ba2\u6237\u7aef\u5df2\u7ecf\u5efa\u7acb\u7684\u82e5\u5e72\u8fde\u63a5\u548c\u76d1\u542c\u5957\u63a5\u5b57\uff0c\u5b9e\u9645fd_array\u6570\u7ec4\u5f53\u4e2d\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u5c31\u662f\u9700\u8981\u8ba9select\u76d1\u89c6\u8bfb\u4e8b\u4ef6\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u3002<\/li>\n\n\n\n<li>\u6211\u4eec\u7684select\u670d\u52a1\u5668\u53ea\u662f\u8bfb\u53d6\u5ba2\u6237\u7aef\u53d1\u6765\u7684\u6570\u636e\uff0c\u56e0\u6b64\u53ea\u9700\u8981\u8ba9select\u5e2e\u6211\u4eec\u76d1\u89c6\u7279\u5b9a\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u8bfb\u4e8b\u4ef6\uff0c\u5982\u679c\u8981\u540c\u65f6\u8ba9select\u5e2e\u6211\u4eec\u76d1\u89c6\u7279\u5b9a\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u8bfb\u4e8b\u4ef6\u548c\u5199\u4e8b\u4ef6\uff0c\u5219\u9700\u8981\u5206\u522b\u5b9a\u4e49readfds\u548cwritefds\uff0c\u5e76\u5b9a\u4e49\u4e24\u4e2a\u6570\u7ec4\u5206\u522b\u4fdd\u5b58\u9700\u8981\u88ab\u76d1\u89c6\u8bfb\u4e8b\u4ef6\u548c\u5199\u4e8b\u4ef6\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\uff0c\u4fbf\u4e8e\u6bcf\u6b21\u8c03\u7528select\u51fd\u6570\u524d\u5bf9readfds\u548cwritefds\u8fdb\u884c\u91cd\u65b0\u8bbe\u7f6e\u3002<\/li>\n\n\n\n<li>\u670d\u52a1\u5668\u521a\u5f00\u59cb\u8fd0\u884c\u65f6\uff0cfd_array\u6570\u7ec4\u5f53\u4e2d\u53ea\u6709\u76d1\u542c\u5957\u63a5\u5b57\uff0c\u56e0\u6b64select\u7b2c\u4e00\u6b21\u8c03\u7528\u65f6\u53ea\u9700\u8981\u76d1\u89c6\u76d1\u542c\u5957\u63a5\u5b57\u7684\u8bfb\u4e8b\u4ef6\u662f\u5426\u5c31\u7eea\uff0c\u4f46\u6bcf\u6b21\u8c03\u7528accept\u83b7\u53d6\u5230\u65b0\u8fde\u63a5\u540e\uff0c\u90fd\u4f1a\u5c06\u65b0\u8fde\u63a5\u5bf9\u5e94\u7684\u5957\u63a5\u5b57\u6dfb\u52a0\u5230fd_array\u5f53\u4e2d\uff0c\u56e0\u6b64\u540e\u7eedselect\u8c03\u7528\u65f6\u5c31\u9700\u8981\u76d1\u89c6\u76d1\u542c\u5957\u63a5\u5b57\u548c\u82e5\u5e72\u8fde\u63a5\u5957\u63a5\u5b57\u7684\u8bfb\u4e8b\u4ef6\u662f\u5426\u5c31\u7eea\u3002<\/li>\n\n\n\n<li>\u7531\u4e8e\u8c03\u7528select\u65f6\u8fd8\u9700\u8981\u4f20\u5165\u88ab\u76d1\u89c6\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u4e2d\u6700\u5927\u6587\u4ef6\u63cf\u8ff0\u7b26\u503c+1\uff0c\u56e0\u6b64\u6bcf\u6b21\u5728\u904d\u5386fd_array\u5bf9readfds\u8fdb\u884c\u91cd\u65b0\u8bbe\u7f6e\u65f6\uff0c\u8fd8\u9700\u8981\u8bb0\u5f55\u6700\u5927\u6587\u4ef6\u63cf\u8ff0\u7b26\u503c\u3002<\/li>\n<\/ul>\n\n\n\n<p>\u8fd9\u5176\u4e2d\u8fd8\u6709\u5f88\u591a\u7ec6\u8282\uff0c\u4e0b\u9762\u6211\u4eec\u5c31\u6765\u5b9e\u73b0\u8fd9\u6837\u4e00\u4e2aselect\u670d\u52a1\u5668\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">select\u670d\u52a1\u5668<\/h3>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>Socket\u7c7b<\/p>\n<\/blockquote>\n\n\n\n<p>\u9996\u5148\u6211\u4eec\u53ef\u4ee5\u7f16\u5199\u4e00\u4e2aSocket\u7c7b\uff0c\u5bf9\u5957\u63a5\u5b57\u76f8\u5173\u7684\u63a5\u53e3\u8fdb\u884c\u4e00\u5b9a\u7a0b\u5ea6\u7684\u5c01\u88c5\uff0c\u4e3a\u4e86\u8ba9\u5916\u90e8\u80fd\u591f\u76f4\u63a5\u8c03\u7528Socket\u7c7b\u5f53\u4e2d\u5c01\u88c5\u7684\u51fd\u6570\uff0c\u4e8e\u662f\u5c06\u8fd9\u4e9b\u51fd\u6570\u5b9a\u4e49\u6210\u4e86\u9759\u6001\u6210\u5458\u51fd\u6570\u3002<\/p>\n\n\n\n<p>\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>#pragma once\n\n#include &lt;iostream&gt;\n#include &lt;unistd.h&gt;\n#include &lt;sys\/socket.h&gt;\n#include &lt;sys\/types.h&gt;\n#include &lt;arpa\/inet.h&gt;\n#include &lt;cstring&gt;\n#include &lt;cstdlib&gt;\n\nclass Socket{\n\npublic:\n    \/\/\u521b\u5efa\u5957\u63a5\u5b57\n    static int SocketCreate()\n    {\n\n        int sock = socket(AF_INET, SOCK_STREAM, 0);\n        if (sock &lt; 0){\n\n            std::cerr &lt;&lt; \"socket error\" &lt;&lt; std::endl;\n            exit(2);\n        }\n        \/\/\u8bbe\u7f6e\u7aef\u53e3\u590d\u7528\n        int opt = 1;\n        setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &amp;opt, sizeof(opt));\n        return sock;\n    }\n    \/\/\u7ed1\u5b9a\n    static void SocketBind(int sock, int port)\n    {\n\n        struct sockaddr_in local;\n        memset(&amp;local, 0, sizeof(local));\n        local.sin_family = AF_INET;\n        local.sin_port = htons(port);\n        local.sin_addr.s_addr = INADDR_ANY;\n\n        socklen_t len = sizeof(local);\n\n        if (bind(sock, (struct sockaddr*)&amp;local, len) &lt; 0){\n\n            std::cerr &lt;&lt; \"bind error\" &lt;&lt; std::endl;\n            exit(3);\n        }\n    }\n    \/\/\u76d1\u542c\n    static void SocketListen(int sock, int backlog)\n    {\n\n        if (listen(sock, backlog) &lt; 0){\n\n            std::cerr &lt;&lt; \"listen error\" &lt;&lt; std::endl;\n            exit(4);\n        }\n    }\n};<\/code><\/pre>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>SelectServer\u7c7b<\/p>\n<\/blockquote>\n\n\n\n<p>\u73b0\u5728\u7f16\u5199SelectServer\u7c7b\uff0c\u56e0\u4e3a\u6211\u5f53\u524d\u4f7f\u7528\u7684\u662f\u4e91\u670d\u52a1\u5668\uff0c\u6240\u4ee5\u7f16\u5199\u7684select\u670d\u52a1\u5668\u5728\u7ed1\u5b9a\u65f6\u4e0d\u9700\u8981\u663e\u793a\u7ed1\u5b9aIP\u5730\u5740\uff0c\u76f4\u63a5\u5c06IP\u5730\u5740\u8bbe\u7f6e\u4e3a<code>INADDR_ANY<\/code>\u5c31\u884c\u4e86\uff0c\u6240\u4ee5\u7c7b\u5f53\u4e2d\u53ea\u5305\u542b\u76d1\u542c\u5957\u63a5\u5b57\u548c\u7aef\u53e3\u53f7\u4e24\u4e2a\u6210\u5458\u53d8\u91cf\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5728\u6784\u9020SelectServer\u5bf9\u8c61\u65f6\uff0c\u9700\u8981\u6307\u660eselect\u670d\u52a1\u5668\u7684\u7aef\u53e3\u53f7\uff0c\u5f53\u7136\u4e5f\u53ef\u4ee5\u5728\u521d\u59cb\u5316select\u670d\u52a1\u5668\u7684\u65f6\u5019\u6307\u660e\u3002<\/li>\n\n\n\n<li>\u5728\u521d\u59cb\u5316select\u670d\u52a1\u5668\u7684\u65f6\u5019\u8c03\u7528Socket\u7c7b\u5f53\u4e2d\u7684\u51fd\u6570\uff0c\u4f9d\u6b21\u8fdb\u884c\u5957\u63a5\u5b57\u7684\u521b\u5efa\u3001\u7ed1\u5b9a\u548c\u76d1\u542c\u5373\u53ef\u3002<\/li>\n\n\n\n<li>\u5728\u6790\u6784\u51fd\u6570\u4e2d\u53ef\u4ee5\u9009\u62e9\u8c03\u7528close\u51fd\u6570\u5c06\u76d1\u542c\u5957\u63a5\u5b57\u8fdb\u884c\u5173\u95ed\uff0c\u4f46\u5b9e\u9645\u4e5f\u53ef\u4ee5\u4e0d\u8fdb\u884c\u8be5\u52a8\u4f5c\uff0c\u56e0\u4e3a\u670d\u52a1\u5668\u8fd0\u884c\u540e\u4e00\u822c\u662f\u4e0d\u9000\u51fa\u7684\u3002<\/li>\n<\/ul>\n\n\n\n<p>\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>#pragma once\n\n#include \"socket.hpp\"\n#include &lt;sys\/select.h&gt;\n\n#define BACK_LOG 5\n\nclass SelectServer{\n\nprivate:\n    int _listen_sock; \/\/\u76d1\u542c\u5957\u63a5\u5b57\n    int _port; \/\/\u7aef\u53e3\u53f7\npublic:\n    SelectServer(int port)\n        : _port(port)\n    {\n            }\n    void InitSelectServer()\n    {\n\n        _listen_sock = Socket::SocketCreate();\n        Socket::SocketBind(_listen_sock, _port);\n        Socket::SocketListen(_listen_sock, BACK_LOG);\n    }\n    ~SelectServer()\n    {\n\n        if (_listen_sock &gt;= 0){\n\n            close(_listen_sock);\n        }\n    }\n};<\/code><\/pre>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>\u8fd0\u884c\u670d\u52a1\u5668<\/p>\n<\/blockquote>\n\n\n\n<p>\u670d\u52a1\u5668\u521d\u59cb\u5316\u5b8c\u6bd5\u540e\u5c31\u5e94\u8be5\u5468\u671f\u6027\u7684\u6267\u884c\u67d0\u79cd\u52a8\u4f5c\u4e86\uff0c\u800cselect\u670d\u52a1\u5668\u8981\u505a\u7684\u5c31\u662f\u4e0d\u65ad\u8c03\u7528select\u51fd\u6570\uff0c\u5f53\u4e8b\u4ef6\u5c31\u7eea\u65f6\u5bf9\u5e94\u6267\u884c\u67d0\u79cd\u52a8\u4f5c\u5373\u53ef\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u9996\u5148\uff0c\u5728select\u670d\u52a1\u5668\u5f00\u59cb\u6b7b\u5faa\u73af\u8c03\u7528select\u51fd\u6570\u4e4b\u524d\uff0c\u9700\u8981\u5148\u5b9a\u4e49\u4e00\u4e2afd_array\u6570\u7ec4\uff0c\u5148\u628a\u6570\u7ec4\u4e2d\u6240\u6709\u7684\u4f4d\u7f6e\u521d\u59cb\u5316\u4e3a\u65e0\u6548\uff0c\u5e76\u5c06\u76d1\u542c\u5957\u63a5\u5b57\u6dfb\u52a0\u5230\u8be5\u6570\u7ec4\u5f53\u4e2d\uff0cfd_array\u6570\u7ec4\u5f53\u4e2d\u4fdd\u5b58\u7684\u5c31\u662f\u9700\u8981\u88abselect\u76d1\u89c6\u8bfb\u4e8b\u4ef6\u662f\u5426\u5c31\u7eea\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u3002<\/li>\n\n\n\n<li>\u6b64\u540e\uff0cselect\u670d\u52a1\u5668\u5c31\u4e0d\u65ad\u8c03\u7528select\u51fd\u6570\u76d1\u89c6\u8bfb\u4e8b\u4ef6\u662f\u5426\u5c31\u7eea\uff0c\u6bcf\u6b21\u8c03\u7528select\u51fd\u6570\u4e4b\u524d\u90fd\u9700\u8981\u91cd\u65b0\u8bbe\u7f6ereadfds\uff0c\u5177\u4f53\u8bbe\u7f6e\u8fc7\u7a0b\u5c31\u662f\u904d\u5386fd_array\u6570\u7ec4\uff0c\u5c06fd_array\u6570\u7ec4\u5f53\u4e2d\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u6dfb\u52a0\u5230readfds\u5f53\u4e2d\uff0c\u5e76\u540c\u65f6\u8bb0\u5f55\u6700\u5927\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u503cmaxfd\uff0c\u56e0\u4e3a\u540e\u7eed\u8c03\u7528select\u51fd\u6570\u65f6\u9700\u8981\u5c06maxfd+1\u4f5c\u4e3a\u7b2c\u4e00\u4e2a\u53c2\u6570\u4f20\u5165\u3002<\/li>\n\n\n\n<li>\u5f53select\u51fd\u6570\u8fd4\u56de\u540e\uff0c\u5982\u679c\u8fd4\u56de\u503c\u4e3a0\uff0c\u5219\u8bf4\u660etimeout\u65f6\u95f4\u8017\u5c3d\uff0c\u6b64\u65f6\u76f4\u63a5\u51c6\u5907\u8fdb\u884c\u4e0b\u4e00\u6b21select\u8c03\u7528\u5373\u53ef\u3002\u5982\u679cselect\u7684\u8fd4\u56de\u503c\u4e3a-1\uff0c\u5219\u8bf4\u660eselect\u8c03\u7528\u5931\u8d25\uff0c\u6b64\u65f6\u4e5f\u8ba9\u670d\u52a1\u5668\u51c6\u5907\u8fdb\u884c\u4e0b\u4e00\u6b21select\u8c03\u7528\uff0c\u4f46\u5b9e\u9645\u5e94\u8be5\u8fdb\u4e00\u6b65\u5224\u65ad\u9519\u8bef\u7801\uff0c\u6839\u636e\u9519\u8bef\u7801\u6765\u5224\u65ad\u662f\u5426\u5e94\u8be5\u7ee7\u7eed\u8c03\u7528select\u51fd\u6570\u3002<\/li>\n\n\n\n<li>\u5982\u679cselect\u7684\u8fd4\u56de\u503c\u5927\u4e8e0\uff0c\u5219\u8bf4\u660eselect\u51fd\u6570\u8c03\u7528\u6210\u529f\uff0c\u6b64\u65f6\u5df2\u7ecf\u6709\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u8bfb\u4e8b\u4ef6\u5c31\u7eea\uff0c\u63a5\u4e0b\u6765\u5c31\u5e94\u8be5\u5bf9\u5c31\u7eea\u4e8b\u4ef6\u8fdb\u884c\u5904\u7406\u3002<\/li>\n<\/ul>\n\n\n\n<p>\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>#pragma once\n\n#include \"socket.hpp\"\n#include &lt;sys\/select.h&gt;\n\n#define BACK_LOG 5\n#define NUM 1024\n#define DFL_FD - 1\n\nclass SelectServer{\n\nprivate:\n    int _listen_sock; \/\/\u76d1\u542c\u5957\u63a5\u5b57\n    int _port; \/\/\u7aef\u53e3\u53f7\npublic:\n    void Run()\n    {\n\n        fd_set readfds; \/\/\u8bfb\u6587\u4ef6\u63cf\u8ff0\u7b26\u96c6\n        int fd_array&#91;NUM]; \/\/\u4fdd\u5b58\u9700\u8981\u88ab\u76d1\u89c6\u8bfb\u4e8b\u4ef6\u662f\u5426\u5c31\u7eea\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\n        ClearFdArray(fd_array, NUM, DFL_FD); \/\/\u5c06\u6570\u7ec4\u4e2d\u7684\u6240\u6709\u4f4d\u7f6e\u8bbe\u7f6e\u4e3a\u65e0\u6548\n        fd_array&#91;0] = _listen_sock; \/\/\u5c06\u76d1\u542c\u5957\u63a5\u5b57\u6dfb\u52a0\u5230fd_array\u6570\u7ec4\u4e2d\u7684\u7b2c0\u4e2a\u4f4d\u7f6e\n        for (;;){\n\n            FD_ZERO(&amp;readfds); \/\/\u6e05\u7a7areadfds\n            \/\/\u5c06fd_array\u6570\u7ec4\u5f53\u4e2d\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u6dfb\u52a0\u5230readfds\u5f53\u4e2d\uff0c\u5e76\u8bb0\u5f55\u6700\u5927\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\n            int maxfd = DFL_FD;\n            for (int i = 0; i &lt; NUM; i++){\n\n                if (fd_array&#91;i] == DFL_FD) \/\/\u8df3\u8fc7\u65e0\u6548\u7684\u4f4d\u7f6e\n                    continue;\n                FD_SET(fd_array&#91;i], &amp;readfds); \/\/\u5c06\u6709\u6548\u4f4d\u7f6e\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u6dfb\u52a0\u5230readfds\u5f53\u4e2d\n                if (fd_array&#91;i] &gt; maxfd) \/\/\u66f4\u65b0\u6700\u5927\u6587\u4ef6\u63cf\u8ff0\u7b26\n                    maxfd = fd_array&#91;i];\n            }\n            switch (select(maxfd + 1, &amp;readfds, nullptr, nullptr, nullptr)){\n\n                case 0:\n                    std::cout&lt;&lt;\"timeout...\"&lt;&lt;std::endl;\n                    break;\n                case -1:\n                    std::cerr &lt;&lt; \"select error\" &lt;&lt; std::endl;\n                    break;\n                default:\n                    \/\/\u6b63\u5e38\u7684\u4e8b\u4ef6\u5904\u7406\n                    std::cout&lt;&lt;\"\u6709\u4e8b\u4ef6\u53d1\u751f...\"&lt;&lt;std::endl;\n                    \/\/HandlerEvent(readfds, fd_array, NUM);\n                    break;\n            }\/\/end switch\n        }\/\/end for\n    }\nprivate:\n    void ClearFdArray(int fd_array&#91;], int num, int default_fd)\n    {\n\n        for (int i = 0; i &lt; num; i++){\n\n            fd_array&#91;i] = default_fd;\n        }\n    }\n};<\/code><\/pre>\n\n\n\n<p><strong>\u8bf4\u660e\u4e00\u4e0b\uff1a<\/strong> \u4e3a\u4e86\u6d4b\u8bd5timeout\u4e0d\u540c\u53d6\u503c\u65f6\u7684\u4e0d\u540c\u6548\u679c\uff0c\u5f53\u6709\u4e8b\u4ef6\u5c31\u7eea\u65f6\u8fd9\u91cc\u5148\u53ea\u6253\u5370\u4e00\u53e5\u63d0\u793a\u8bed\u53e5\u3002<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>timeout\u6d4b\u8bd5<\/p>\n<\/blockquote>\n\n\n\n<p>\u5728\u8fd0\u884c\u670d\u52a1\u5668\u65f6\u9700\u8981\u5148\u5b9e\u4f8b\u5316\u4e00\u4e2aSelectServer\u7c7b\u5bf9\u8c61\uff0c\u5bf9select\u670d\u52a1\u5668\u8fdb\u884c\u521d\u59cb\u5316\u540e\u5c31\u53ef\u4ee5\u8c03\u7528Run\u6210\u5458\u51fd\u6570\u8fd0\u884c\u670d\u52a1\u5668\u4e86\u3002<\/p>\n\n\n\n<p>\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>#include \"select_server.hpp\"\n#include &lt;string&gt;\n\nstatic void Usage(std::string proc)\n{\n\n    std::cerr &lt;&lt; \"Usage: \" &lt;&lt; proc &lt;&lt; \" port\" &lt;&lt; std::endl;\n}\nint main(int argc, char* argv&#91;])\n{\n\n    if (argc != 2){\n\n        Usage(argv&#91;0]);\n        exit(1);\n    }\n    int port = atoi(argv&#91;1]);\n\n    SelectServer* svr = new SelectServer(port);\n    svr-&gt;InitSelectServer();\n    svr-&gt;Run();\n\n    return 0;\n}<\/code><\/pre>\n\n\n\n<p>\u7531\u4e8e\u5f53\u524d\u670d\u52a1\u5668\u8c03\u7528select\u51fd\u6570\u65f6\u76f4\u63a5\u5c06timeout\u8bbe\u7f6e\u4e3a\u4e86nullptr\uff0c\u56e0\u6b64select\u51fd\u6570\u8c03\u7528\u540e\u4f1a\u8fdb\u884c\u963b\u585e\u7b49\u5f85\u3002\u800c\u670d\u52a1\u5668\u5728\u7b2c\u4e00\u6b21\u8c03\u7528select\u51fd\u6570\u65f6\u53ea\u8ba9select\u76d1\u89c6\u76d1\u542c\u5957\u63a5\u5b57\u7684\u8bfb\u4e8b\u4ef6\uff0c\u6240\u4ee5\u8fd0\u884c\u670d\u52a1\u5668\u540e\u5982\u679c\u6ca1\u6709\u5ba2\u6237\u7aef\u53d1\u6765\u8fde\u63a5\u8bf7\u6c42\uff0c\u90a3\u4e48\u8bfb\u4e8b\u4ef6\u5c31\u4e0d\u4f1a\u5c31\u7eea\uff0c\u800c\u670d\u52a1\u5668\u5219\u4f1a\u4e00\u76f4\u5728\u7b2c\u4e00\u6b21\u8c03\u7528\u7684select\u51fd\u6570\u4e2d\u8fdb\u884c\u963b\u585e\u7b49\u5f85\u3002<img decoding=\"async\" src=\"https:\/\/cdn.codergodv.xyz\/47992ea0aba9053c35bb1c8d539015bf.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"><\/p>\n\n\n\n<p>\u5f53\u6211\u4eec\u501f\u52a9telnet\u5de5\u5177\u5411select\u670d\u52a1\u5668\u53d1\u8d77\u8fde\u63a5\u8bf7\u6c42\u540e\uff0cselect\u51fd\u6570\u5c31\u4f1a\u7acb\u9a6c\u68c0\u6d4b\u5230\u76d1\u542c\u5957\u63a5\u5b57\u7684\u8bfb\u4e8b\u4ef6\u5c31\u7eea\uff0c\u6b64\u65f6select\u51fd\u6570\u4fbf\u4f1a\u6210\u529f\u8fd4\u56de\uff0c\u5e76\u5c06\u6211\u4eec\u8bbe\u7f6e\u7684\u63d0\u793a\u8bed\u53e5\u8fdb\u884c\u6253\u5370\u8f93\u51fa\uff0c\u56e0\u4e3a\u5f53\u524d\u7a0b\u5e8f\u5e76\u6ca1\u6709\u5bf9\u5c31\u7eea\u4e8b\u4ef6\u8fdb\u884c\u5904\u7406\uff0c\u6b64\u540e\u6bcf\u6b21select\u51fd\u6570\u4e00\u8c03\u7528\u5c31\u4f1a\u68c0\u6d4b\u5230\u8bfb\u4e8b\u4ef6\u5c31\u7eea\u5e76\u6210\u529f\u8fd4\u56de\uff0c\u56e0\u6b64\u4f1a\u770b\u5230\u5c4f\u5e55\u4e0d\u65ad\u6253\u5370\u8f93\u51fa\u63d0\u793a\u8bed\u53e5\u3002<img decoding=\"async\" src=\"https:\/\/cdn.codergodv.xyz\/3eab1f4b3451bfca363fd41ead10025b.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"><\/p>\n\n\n\n<p>\u5982\u679c\u670d\u52a1\u5668\u5728\u8c03\u7528select\u51fd\u6570\u65f6\u5c06timeout\u7684\u503c\u8bbe\u7f6e\u4e3a0\uff0c\u90a3\u4e48select\u51fd\u6570\u8c03\u7528\u540e\u5c31\u4f1a\u8fdb\u884c\u975e\u963b\u585e\u7b49\u5f85\uff0c\u65e0\u8bba\u88ab\u76d1\u89c6\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u4e0a\u7684\u4e8b\u4ef6\u662f\u5426\u5c31\u7eea\uff0cselect\u68c0\u6d4b\u540e\u90fd\u4f1a\u7acb\u5373\u8fd4\u56de\u3002<\/p>\n\n\n\n<p>\u6b64\u65f6\u5982\u679cselect\u76d1\u89c6\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u4e0a\u6709\u4e8b\u4ef6\u5c31\u7eea\uff0c\u90a3\u4e48select\u51fd\u6570\u7684\u8fd4\u56de\u503c\u5c31\u662f\u5927\u4e8e0\u7684\uff0c\u5982\u679cselect\u76d1\u89c6\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u4e0a\u6ca1\u6709\u4e8b\u4ef6\u5c31\u7eea\uff0c\u90a3\u4e48select\u7684\u8fd4\u56de\u503c\u5c31\u662f\u7b49\u4e8e0\u7684\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>struct timeval timeout = {\n             0, 0 }; \/\/\u6bcf\u96940\u79d2timeout\u4e00\u6b21\nswitch (select(maxfd + 1, &amp;readfds, nullptr, nullptr, &amp;timeout)){\n\n    case 0:\n        std::cout &lt;&lt; \"timeout...\" &lt;&lt; std::endl;\n        break;\n    case -1:\n        std::cerr &lt;&lt; \"select error\" &lt;&lt; std::endl;                                   \n        break;\n    default:\n        \/\/\u6b63\u5e38\u7684\u4e8b\u4ef6\u5904\u7406                                                          \n        std::cout &lt;&lt; \"\u6709\u4e8b\u4ef6\u53d1\u751f...\" &lt;&lt; std::endl;\n        \/\/HandlerEvent(readfds, fd_array, NUM);                                   \n        break;\n}<\/code><\/pre>\n\n\n\n<p>\u8fd0\u884c\u670d\u52a1\u5668\u540e\u5982\u679c\u6ca1\u6709\u5ba2\u6237\u7aef\u53d1\u6765\u8fde\u63a5\u8bf7\u6c42\uff0c\u90a3\u4e48select\u670d\u52a1\u5668\u5c31\u4f1a\u4e00\u76f4\u8c03\u7528select\u51fd\u6570\u8fdb\u884c\u8f6e\u8be2\u68c0\u6d4b\uff0c\u4f46\u6bcf\u6b21\u68c0\u6d4b\u65f6\u8bfb\u4e8b\u4ef6\u90fd\u4e0d\u5c31\u7eea\uff0c\u56e0\u6b64\u6bcf\u6b21select\u51fd\u6570\u7684\u8fd4\u56de\u503c\u90fd\u662f0\uff0c\u56e0\u6b64\u5c31\u4f1a\u4e0d\u65ad\u6253\u5370\u201ctimeout\u2026\u201d\u63d0\u793a\u8bed\u53e5\u3002<img decoding=\"async\" src=\"https:\/\/cdn.codergodv.xyz\/a4bc20593f23b76942c6447fcfc0424e.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"><\/p>\n\n\n\n<p>\u5f53\u6709\u5ba2\u6237\u7aef\u53d1\u6765\u8fde\u63a5\u8bf7\u6c42\u540e\uff0cselect\u5728\u67d0\u6b21\u8f6e\u8be2\u68c0\u6d4b\u65f6\u5c31\u4f1a\u68c0\u6d4b\u5230\u76d1\u542c\u5957\u63a5\u5b57\u7684\u8bfb\u4e8b\u4ef6\u5c31\u7eea\uff0c\u6b64\u65f6select\u51fd\u6570\u4fbf\u4f1a\u6210\u529f\u8fd4\u56de\uff0c\u5e76\u5c06\u6211\u4eec\u8bbe\u7f6e\u7684\u63d0\u793a\u8bed\u53e5\u8fdb\u884c\u6253\u5370\u8f93\u51fa\u3002<img decoding=\"async\" src=\"https:\/\/cdn.codergodv.xyz\/3eab1f4b3451bfca363fd41ead10025b-17686485499829.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"><\/p>\n\n\n\n<p>\u5982\u679c\u670d\u52a1\u5668\u5728\u8c03\u7528select\u51fd\u6570\u65f6\u5c06timeout\u7684\u503c\u8bbe\u7f6e\u4e3a\u7279\u5b9a\u7684\u65f6\u95f4\u503c\uff0c\u6bd4\u5982\u6211\u4eec\u8fd9\u91cc\u5c06timeout\u7684\u503c\u8bbe\u7f6e\u4e3a5\u79d2\uff0c\u90a3\u4e48select\u51fd\u6570\u8c03\u7528\u540e\u76845\u79d2\u5185\u4f1a\u8fdb\u884c\u963b\u585e\u7b49\u5f85\uff0c\u5982\u679c5\u79d2\u540e\u4f9d\u65e7\u6ca1\u6709\u8bfb\u4e8b\u4ef6\u5c31\u7eea\uff0c\u90a3\u4e48select\u51fd\u6570\u5c06\u4f1a\u8fdb\u884c\u8d85\u65f6\u8fd4\u56de\u3002<\/p>\n\n\n\n<p>\u6211\u4eec\u53ef\u4ee5\u5c06select\u51fd\u6570\u8d85\u65f6\u8fd4\u56de\u548c\u6210\u529f\u8fd4\u56de\u65f6timeout\u7684\u503c\u8fdb\u884c\u6253\u5370\uff0c\u4ee5\u9a8c\u8bc1timeout\u662f\u4e00\u4e2a\u8f93\u5165\u8f93\u51fa\u578b\u53c2\u6570\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>struct timeval timeout = {\n             5, 0 }; \/\/\u6bcf\u96945\u79d2timeout\u4e00\u6b21\nswitch (select(maxfd + 1, &amp;readfds, nullptr, nullptr, &amp;timeout)){\n\ncase 0:\n    std::cout &lt;&lt; \"timeout: \" &lt;&lt; timeout.tv_sec &lt;&lt; std::endl;\n    break;\ncase -1:\n    std::cerr &lt;&lt; \"select error\" &lt;&lt; std::endl;\n    break;\ndefault:\n    \/\/\u6b63\u5e38\u7684\u4e8b\u4ef6\u5904\u7406                                                          \n    std::cout &lt;&lt; \"\u6709\u4e8b\u4ef6\u53d1\u751f... timeout: \" &lt;&lt; timeout.tv_sec &lt;&lt; std::endl;\n    \/\/HandlerEvent(readfds, fd_array, NUM);                                   \n    break;\n}<\/code><\/pre>\n\n\n\n<p>\u8fd0\u884c\u670d\u52a1\u5668\u540e\u5982\u679c\u6ca1\u6709\u5ba2\u6237\u7aef\u53d1\u6765\u8fde\u63a5\u8bf7\u6c42\uff0c\u90a3\u4e48\u6bcf\u6b21select\u51fd\u6570\u8c03\u75285\u79d2\u540e\u90fd\u4f1a\u8fdb\u884c\u8d85\u65f6\u8fd4\u56de\uff0c\u5e76\u4e14\u6bcf\u6b21\u6253\u5370\u8f93\u51fatimeout\u7684\u503c\u90fd\u662f0\uff0c\u4e5f\u5c31\u610f\u5473\u7740timeout\u7684\u65f6\u95f4\u662f\u88ab\u8017\u5c3d\u4e86\u7684\u3002<img decoding=\"async\" src=\"https:\/\/cdn.codergodv.xyz\/5774536e35bfcd55db1d4fc758ff58c1.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"><\/p>\n\n\n\n<p>\u5f53\u6709\u5ba2\u6237\u7aef\u53d1\u6765\u8fde\u63a5\u8bf7\u6c42\u540e\uff0c\u5728\u67d0\u6b21\u8c03\u7528select\u51fd\u6570\u65f6\u5c31\u4f1a\u68c0\u6d4b\u5230\u76d1\u542c\u5957\u63a5\u5b57\u7684\u8bfb\u4e8b\u4ef6\u5c31\u7eea\uff0c\u6b64\u65f6select\u51fd\u6570\u4fbf\u4f1a\u6210\u529f\u8fd4\u56de\uff0c\u5e76\u5c06\u6211\u4eec\u8bbe\u7f6e\u7684\u63d0\u793a\u8bed\u53e5\u8fdb\u884c\u6253\u5370\u8f93\u51fa\u3002<img decoding=\"async\" src=\"https:\/\/cdn.codergodv.xyz\/633b7afb588a5517f33c3de748bfce1e.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"><\/p>\n\n\n\n<p>\u56e0\u4e3a\u5f53\u524d\u7a0b\u5e8f\u5e76\u6ca1\u6709\u5bf9\u5c31\u7eea\u4e8b\u4ef6\u8fdb\u884c\u5904\u7406\uff0c\u56e0\u6b64\u5728\u7b2c\u4e00\u6b21select\u68c0\u6d4b\u5230\u8bfb\u4e8b\u4ef6\u5c31\u7eea\u540e\uff0c\u4e4b\u540e\u6bcf\u6b21select\u51fd\u6570\u4e00\u8c03\u7528\u5c31\u4f1a\u68c0\u6d4b\u5230\u8bfb\u4e8b\u4ef6\u5c31\u7eea\u5e76\u6210\u529f\u8fd4\u56de\uff0c\u56e0\u6b64\u4f1a\u770b\u5230\u5c4f\u5e55\u4e0d\u65ad\u6253\u5370\u8f93\u51fa\u63d0\u793a\u8bed\u53e5\uff0c\u5e76\u4e14\u540e\u7eed\u6253\u5370\u8f93\u51fatimeout\u7684\u503c\u90fd\u662f4\uff0c\u8868\u793a\u672c\u6b21select\u68c0\u6d4b\u5230\u8bfb\u4e8b\u4ef6\u5c31\u7eea\u65f6timeout\u7684\u5269\u4f59\u65f6\u95f4\u4e3a4\u79d2\u3002<\/p>\n\n\n\n<p>\u56e0\u4e3atimeout\u548creadfds\u3001writefds\u4e0eexceptfds\u4e00\u6837\uff0c\u5b83\u4eec\u90fd\u662f\u8f93\u5165\u8f93\u51fa\u578b\u53c2\u6570\uff0c\u56e0\u6b64\u5982\u679c\u8981\u4f7f\u7528timeout\u53c2\u6570\uff0c\u90a3\u4e48\u5728\u6bcf\u6b21\u8c03\u7528select\u51fd\u6570\u4e4b\u524d\u4e5f\u90fd\u9700\u8981\u5bf9timeout\u7684\u503c\u8fdb\u884c\u91cd\u65b0\u8bbe\u7f6e\u3002<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>\u4e8b\u4ef6\u5904\u7406<\/p>\n<\/blockquote>\n\n\n\n<p>\u5f53select\u68c0\u6d4b\u5230\u6709\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u8bfb\u4e8b\u4ef6\u5c31\u7eea\u5e76\u6210\u529f\u8fd4\u56de\u540e\uff0c\u63a5\u4e0b\u6765\u5c31\u5e94\u8be5\u5bf9\u5c31\u7eea\u4e8b\u4ef6\u8fdb\u884c\u5904\u7406\u4e86\uff0c\u8fd9\u91cc\u7f16\u5199\u4e00\u4e2aHandlerEvent\u51fd\u6570\uff0c\u5f53\u8bfb\u4e8b\u4ef6\u5c31\u7eea\u540e\u5c31\u8c03\u7528\u8be5\u51fd\u6570\u8fdb\u884c\u4e8b\u4ef6\u5904\u7406\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5728\u8fdb\u884c\u4e8b\u4ef6\u5904\u7406\u65f6\u9700\u8981\u904d\u5386fd_array\u6570\u7ec4\u5f53\u4e2d\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\uff0c\u4f9d\u6b21\u5224\u65ad\u5404\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\u5bf9\u5e94\u7684\u8bfb\u4e8b\u4ef6\u662f\u5426\u5c31\u7eea\uff0c\u5982\u679c\u5c31\u7eea\u5219\u9700\u8981\u8fdb\u884c\u4e8b\u4ef6\u5904\u7406\u3002<\/li>\n\n\n\n<li>\u5f53\u4e00\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u8bfb\u4e8b\u4ef6\u5c31\u7eea\u540e\uff0c\u8fd8\u9700\u8981\u8fdb\u4e00\u6b65\u5224\u65ad\u8be5\u6587\u4ef6\u63cf\u8ff0\u7b26\u662f\u5426\u662f\u76d1\u542c\u5957\u63a5\u5b57\uff0c\u5982\u679c\u662f\u76d1\u542c\u5957\u63a5\u5b57\u7684\u8bfb\u4e8b\u4ef6\u5c31\u7eea\uff0c\u90a3\u4e48\u5c31\u5e94\u8be5\u8c03\u7528accept\u51fd\u6570\u5c06\u5e95\u5c42\u7684\u8fde\u63a5\u83b7\u53d6\u4e0a\u6765\u3002\u4f46\u662f\u5149\u5149\u8c03\u7528accept\u5c06\u8fde\u63a5\u83b7\u53d6\u4e0a\u6765\u8fd8\u4e0d\u591f\uff0c\u4e3a\u4e86\u4e0b\u4e00\u6b21\u8c03\u7528select\u51fd\u6570\u65f6\u80fd\u591f\u8ba9select\u5e2e\u6211\u4eec\u76d1\u89c6\u65b0\u8fde\u63a5\u7684\u8bfb\u4e8b\u4ef6\u662f\u5426\u5c31\u7eea\uff0c\u5728\u8fde\u63a5\u83b7\u53d6\u4e0a\u6765\u540e\u8fd8\u5e94\u8be5\u5c06\u8be5\u8fde\u63a5\u5bf9\u5e94\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u6dfb\u52a0\u5230fd_array\u6570\u7ec4\u5f53\u4e2d\uff0c\u8fd9\u6837\u5728\u4e0b\u4e00\u6b21\u8c03\u7528select\u51fd\u6570\u524d\u5bf9readfds\u91cd\u65b0\u8bbe\u7f6e\u65f6\u5c31\u80fd\u5c06\u8be5\u6587\u4ef6\u63cf\u8ff0\u7b26\u6dfb\u52a0\u8fdb\u53bb\u4e86\u3002<\/li>\n\n\n\n<li>\u5982\u679c\u662f\u4e0e\u5ba2\u6237\u7aef\u5efa\u7acb\u7684\u8fde\u63a5\u5bf9\u5e94\u7684\u8bfb\u4e8b\u4ef6\u5c31\u7eea\uff0c\u90a3\u4e48\u5c31\u5e94\u8be5\u8c03\u7528read\u51fd\u6570\u8bfb\u53d6\u5ba2\u6237\u7aef\u53d1\u6765\u7684\u6570\u636e\uff0c\u5982\u679c\u8bfb\u53d6\u6210\u529f\u5219\u5c06\u8bfb\u5230\u7684\u6570\u636e\u5728\u670d\u52a1\u5668\u7aef\u8fdb\u884c\u6253\u5370\u3002\u5982\u679c\u8c03\u7528read\u51fd\u6570\u8bfb\u53d6\u5931\u8d25\u6216\u8005\u5ba2\u6237\u7aef\u5173\u95ed\u4e86\u8fde\u63a5\uff0c\u90a3\u4e48select\u670d\u52a1\u5668\u4e5f\u5e94\u8be5\u8c03\u7528close\u51fd\u6570\u5173\u95ed\u5bf9\u5e94\u7684\u8fde\u63a5\uff0c\u4f46\u6b64\u65f6\u5149\u5149\u5173\u95ed\u8fde\u63a5\u4e5f\u662f\u4e0d\u591f\u7684\uff0c\u8fd8\u5e94\u8be5\u5c06\u8be5\u8fde\u63a5\u5bf9\u5e94\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u4ecefd_array\u6570\u7ec4\u5f53\u4e2d\u6e05\u9664\uff0c\u5426\u5219\u540e\u7eed\u8c03\u7528\u7684select\u51fd\u6570\u8fd8\u4f1a\u5e2e\u6211\u4eec\u76d1\u89c6\u8be5\u8fde\u63a5\u7684\u8bfb\u4e8b\u4ef6\u662f\u5426\u5c31\u7eea\uff0c\u4f46\u5b9e\u9645\u5df2\u7ecf\u4e0d\u9700\u8981\u4e86\u3002<\/li>\n<\/ul>\n\n\n\n<p>\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>#pragma once\n\n#include \"socket.hpp\"\n#include &lt;sys\/select.h&gt;\n\n#define BACK_LOG 5\n#define NUM 1024\n#define DFL_FD - 1\n\nclass SelectServer{\n\nprivate:\n    int _listen_sock; \/\/\u76d1\u542c\u5957\u63a5\u5b57\n    int _port; \/\/\u7aef\u53e3\u53f7\npublic:\n    void HandlerEvent(const fd_set&amp; readfds, int fd_array&#91;], int num)\n    {\n\n        for (int i = 0; i &lt; num; i++){\n\n            if (fd_array&#91;i] == DFL_FD){\n             \/\/\u8df3\u8fc7\u65e0\u6548\u7684\u4f4d\u7f6e\n                continue;\n            }\n            if (fd_array&#91;i] == _listen_sock&amp;&amp;FD_ISSET(fd_array&#91;i], &amp;readfds)){\n             \/\/\u8fde\u63a5\u4e8b\u4ef6\u5c31\u7eea\n                \/\/\u83b7\u53d6\u8fde\u63a5\n                struct sockaddr_in peer;\n                memset(&amp;peer, 0, sizeof(peer));\n                socklen_t len = sizeof(peer);\n                int sock = accept(_listen_sock, (struct sockaddr*)&amp;peer, &amp;len);\n                if (sock &lt; 0){\n             \/\/\u83b7\u53d6\u8fde\u63a5\u5931\u8d25\n                    std::cerr &lt;&lt; \"accept error\" &lt;&lt; std::endl;\n                    continue;\n                }\n                std::string peer_ip = inet_ntoa(peer.sin_addr);\n                int peer_port = ntohs(peer.sin_port);\n                std::cout &lt;&lt; \"get a new link&#91;\" &lt;&lt; peer_ip &lt;&lt; \":\" &lt;&lt; peer_port &lt;&lt; \"]\" &lt;&lt; std::endl;\n\n                if (!SetFdArray(fd_array, num, sock)){\n             \/\/\u5c06\u83b7\u53d6\u5230\u7684\u5957\u63a5\u5b57\u6dfb\u52a0\u5230fd_array\u5f53\u4e2d\n                    close(sock);\n                    std::cout &lt;&lt; \"select server is full, close fd: \" &lt;&lt; sock &lt;&lt; std::endl;\n                }\n            }\n            else if (FD_ISSET(fd_array&#91;i], &amp;readfds)){\n             \/\/\u8bfb\u4e8b\u4ef6\u5c31\u7eea\n                char buffer&#91;1024];\n                ssize_t size = read(fd_array&#91;i], buffer, sizeof(buffer)-1);\n                if (size &gt; 0){\n             \/\/\u8bfb\u53d6\u6210\u529f\n                    buffer&#91;size] = '\\0';\n                    std::cout &lt;&lt; \"echo# \" &lt;&lt; buffer &lt;&lt; std::endl;\n                }\n                else if (size == 0){\n             \/\/\u5bf9\u7aef\u8fde\u63a5\u5173\u95ed\n                    std::cout &lt;&lt; \"client quit\" &lt;&lt; std::endl;\n                    close(fd_array&#91;i]);\n                    fd_array&#91;i] = DFL_FD; \/\/\u5c06\u8be5\u6587\u4ef6\u63cf\u8ff0\u7b26\u4ecefd_array\u4e2d\u6e05\u9664\n                }\n                else{\n\n                    std::cerr &lt;&lt; \"read error\" &lt;&lt; std::endl;\n                    close(fd_array&#91;i]);\n                    fd_array&#91;i] = DFL_FD; \/\/\u5c06\u8be5\u6587\u4ef6\u63cf\u8ff0\u7b26\u4ecefd_array\u4e2d\u6e05\u9664\n                }\n            }\n        }\n    }\nprivate:\n    bool SetFdArray(int fd_array&#91;], int num, int fd)\n    {\n\n        for (int i = 0; i &lt;num; i++){\n\n            if (fd_array&#91;i] == DFL_FD){\n             \/\/\u8be5\u4f4d\u7f6e\u6ca1\u6709\u88ab\u4f7f\u7528\n                fd_array&#91;i] = fd;\n                return true;\n            }\n        }\n        return false; \/\/fd_array\u6570\u7ec4\u5df2\u6ee1\n    }\n};<\/code><\/pre>\n\n\n\n<p><strong>\u8bf4\u660e\u4e00\u4e0b\uff1a<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5f53\u8c03\u7528accept\u51fd\u6570\u4ece\u5e95\u5c42\u83b7\u53d6\u4e0a\u6765\u8fde\u63a5\u540e\uff0c\u4e0d\u80fd\u7acb\u5373\u8c03\u7528read\u51fd\u6570\u8bfb\u53d6\u8be5\u8fde\u63a5\u5f53\u4e2d\u7684\u6570\u636e\uff0c\u56e0\u4e3a\u6b64\u65f6\u65b0\u8fde\u63a5\u5f53\u4e2d\u7684\u6570\u636e\u53ef\u80fd\u5e76\u6ca1\u6709\u5c31\u7eea\uff0c\u5982\u679c\u76f4\u63a5\u8c03\u7528read\u51fd\u6570\u53ef\u80fd\u9700\u8981\u8fdb\u884c\u963b\u585e\u7b49\u5f85\uff0c\u6211\u4eec\u5e94\u8be5\u5c06\u8fd9\u4e2a\u7b49\u5f85\u8fc7\u7a0b\u4ea4\u7ed9select\u51fd\u6570\u6765\u5b8c\u6210\uff0c\u56e0\u6b64\u5728\u83b7\u53d6\u5b8c\u8fde\u63a5\u540e\u76f4\u63a5\u5c06\u8be5\u8fde\u63a5\u5bf9\u5e94\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u6dfb\u52a0\u5230fd_array\u6570\u7ec4\u5f53\u4e2d\u5c31\u884c\u4e86\uff0c\u5f53\u8be5\u8fde\u63a5\u7684\u8bfb\u4e8b\u4ef6\u5c31\u7eea\u65f6select\u51fd\u6570\u4f1a\u544a\u77e5\u6211\u4eec\uff0c\u90a3\u4e2a\u65f6\u5019\u6211\u4eec\u518d\u8fdb\u884c\u6570\u636e\u8bfb\u53d6\u5c31\u4e0d\u4f1a\u88ab\u963b\u585e\u4f4f\u4e86\u3002<\/li>\n\n\n\n<li>\u6dfb\u52a0\u6587\u4ef6\u63cf\u8ff0\u7b26\u5230fd_array\u6570\u7ec4\u5f53\u4e2d\uff0c\u672c\u8d28\u5c31\u662f\u904d\u5386fd_array\u6570\u7ec4\uff0c\u627e\u5230\u4e00\u4e2a\u6ca1\u6709\u88ab\u4f7f\u7528\u7684\u4f4d\u7f6e\u5c06\u8be5\u6587\u4ef6\u63cf\u8ff0\u7b26\u6dfb\u52a0\u8fdb\u53bb\u5373\u53ef\u3002\u4f46\u6709\u53ef\u80fdfd_array\u6570\u7ec4\u4e2d\u5168\u90e8\u7684\u4f4d\u7f6e\u90fd\u5df2\u7ecf\u88ab\u5360\u7528\u4e86\uff0c\u90a3\u4e48\u6587\u4ef6\u63cf\u8ff0\u7b26\u5c31\u4f1a\u6dfb\u52a0\u5931\u8d25\uff0c\u6b64\u65f6\u5c31\u53ea\u80fd\u5c06\u521a\u521a\u83b7\u53d6\u4e0a\u6765\u7684\u8fde\u63a5\u5bf9\u5e94\u7684\u5957\u63a5\u5b57\u8fdb\u884c\u5173\u95ed\uff0c\u56e0\u4e3a\u6b64\u65f6\u670d\u52a1\u5668\u5df2\u7ecf\u6ca1\u6709\u80fd\u529b\u5904\u7406\u8fd9\u4e2a\u8fde\u63a5\u4e86\u3002<\/li>\n<\/ul>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>select\u670d\u52a1\u5668\u6d4b\u8bd5<\/p>\n<\/blockquote>\n\n\n\n<p>\u81f3\u6b64select\u670d\u52a1\u5668\u7f16\u5199\u5b8c\u6bd5\uff0c\u91cd\u65b0\u7f16\u8bd1\u540e\u8fd0\u884c\u670d\u52a1\u5668\uff0c\u5e76\u7528telnet\u5de5\u5177\u8fde\u63a5\u6211\u4eec\u7684\u670d\u52a1\u5668\uff0c\u6b64\u65f6\u901a\u8fc7telnet\u5411\u670d\u52a1\u5668\u53d1\u9001\u7684\u6570\u636e\u5c31\u80fd\u591f\u88ab\u670d\u52a1\u5668\u8bfb\u5230\u5e76\u4e14\u6253\u5370\u8f93\u51fa\u4e86\u3002<img decoding=\"async\" src=\"https:\/\/cdn.codergodv.xyz\/4a1994cc82f1cb0655823a78c6e9b2c7.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"><\/p>\n\n\n\n<p>\u6b64\u5916\uff0c\u867d\u7136\u5f53\u524d\u7684select\u670d\u52a1\u5668\u662f\u4e00\u4e2a\u5355\u8fdb\u7a0b\u7684\u670d\u52a1\u5668\uff0c\u4f46\u5b83\u5374\u53ef\u4ee5\u540c\u65f6\u4e3a\u591a\u4e2a\u5ba2\u6237\u7aef\u63d0\u4f9b\u670d\u52a1\uff0c\u6839\u672c\u539f\u56e0\u5c31\u662f\u56e0\u4e3aselect\u51fd\u6570\u8c03\u7528\u540e\u4f1a\u544a\u77e5select\u670d\u52a1\u5668\u662f\u54ea\u4e2a\u5ba2\u6237\u7aef\u5bf9\u5e94\u7684\u8fde\u63a5\u4e8b\u4ef6\u5c31\u7eea\u4e86\uff0c\u6b64\u65f6select\u670d\u52a1\u5668\u5c31\u53ef\u4ee5\u8bfb\u53d6\u5bf9\u5e94\u5ba2\u6237\u7aef\u53d1\u6765\u7684\u6570\u636e\uff0c\u8bfb\u53d6\u5b8c\u540e\u53c8\u4f1a\u8c03\u7528select\u51fd\u6570\u7b49\u5f85\u67d0\u4e2a\u5ba2\u6237\u7aef\u8fde\u63a5\u7684\u8bfb\u4e8b\u4ef6\u5c31\u7eea\u3002<img decoding=\"async\" src=\"https:\/\/cdn.codergodv.xyz\/0ca46ac7a72586d6174667c3e8835949.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"><\/p>\n\n\n\n<p>\u5f53\u670d\u52a1\u5668\u68c0\u6d4b\u5230\u5ba2\u6237\u7aef\u9000\u51fa\u540e\uff0c\u4e5f\u4f1a\u5173\u95ed\u5bf9\u5e94\u7684\u8fde\u63a5\uff0c\u5e76\u5c06\u5bf9\u5e94\u7684\u5957\u63a5\u5b57\u4ecefd_array\u6570\u7ec4\u5f53\u4e2d\u6e05\u9664\u3002<img decoding=\"async\" src=\"https:\/\/cdn.codergodv.xyz\/31ef27ab72dbf90ba75ad4d22bd8ac26.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"><\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>\u5b58\u5728\u7684\u4e00\u4e9b\u95ee\u9898<\/p>\n<\/blockquote>\n\n\n\n<p>\u5f53\u524d\u7684select\u670d\u52a1\u5668\u5b9e\u9645\u8fd8\u5b58\u5728\u4e00\u4e9b\u95ee\u9898\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u670d\u52a1\u5668\u6ca1\u6709\u5bf9\u5ba2\u6237\u7aef\u53d1\u8fdb\u884c\u54cd\u5e94\u3002select\u670d\u52a1\u5668\u5982\u679c\u8981\u5411\u5ba2\u6237\u7aef\u53d1\u9001\u6570\u636e\uff0c\u4e0d\u80fd\u76f4\u63a5\u8c03\u7528write\u51fd\u6570\uff0c\u56e0\u4e3a\u8c03\u7528write\u51fd\u6570\u65f6\u5b9e\u9645\u4e5f\u5206\u4e3a\u201c\u7b49\u201d\u548c\u201c\u62f7\u8d1d\u201d\u4e24\u6b65\uff0c\u6211\u4eec\u4e5f\u5e94\u8be5\u5c06\u201c\u7b49\u201d\u7684\u8fd9\u4e2a\u8fc7\u7a0b\u4ea4\u7ed9select\u51fd\u6570\uff0c\u56e0\u6b64\u5728\u6bcf\u6b21\u8c03\u7528select\u51fd\u6570\u4e4b\u524d\uff0c\u9664\u4e86\u9700\u8981\u91cd\u65b0\u8bbe\u7f6ereadfds\u8fd8\u9700\u8981\u91cd\u65b0\u8bbe\u7f6ewritefds\uff0c\u5e76\u4e14\u8fd8\u9700\u8981\u4e00\u4e2a\u6570\u7ec4\u6765\u4fdd\u5b58\u9700\u8981\u88ab\u76d1\u89c6\u5199\u4e8b\u4ef6\u662f\u5426\u5c31\u7eea\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\uff0c\u5f53\u67d0\u4e00\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u5199\u4e8b\u4ef6\u5c31\u7eea\u65f6\u6211\u4eec\u624d\u80fd\u591f\u8c03\u7528write\u51fd\u6570\u5411\u5ba2\u6237\u7aef\u53d1\u9001\u6570\u636e\u3002<\/li>\n\n\n\n<li>\u6ca1\u6709\u5b9a\u5236\u534f\u8bae\u3002\u4ee3\u7801\u4e2d\u8bfb\u53d6\u6570\u636e\u65f6\u5e76\u6ca1\u6709\u6309\u7167\u67d0\u79cd\u89c4\u5219\u8fdb\u884c\u8bfb\u53d6\uff0c\u6b64\u65f6\u5c31\u53ef\u80fd\u9020\u6210\u7c98\u5305\u95ee\u9898\uff0c\u6839\u672c\u539f\u56e0\u5c31\u662f\u56e0\u4e3a\u6211\u4eec\u6ca1\u6709\u5b9a\u5236\u534f\u8bae\uff0c\u6bd4\u5982HTTP\u534f\u8bae\u89c4\u5b9a\u5728\u8bfb\u53d6\u5e95\u5c42\u6570\u636e\u65f6\u8bfb\u53d6\u5230\u7a7a\u884c\u5c31\u8868\u660e\u8bfb\u5b8c\u4e86\u4e00\u4e2aHTTP\u62a5\u5934\uff0c\u6b64\u65f6\u518d\u6839\u636eHTTP\u62a5\u5934\u5f53\u4e2d\u7684Content-Length\u5c5e\u6027\u5f97\u77e5\u6b63\u6587\u7684\u957f\u5ea6\uff0c\u6700\u7ec8\u5c31\u80fd\u591f\u8bfb\u53d6\u5230\u4e00\u4e2a\u5b8c\u6574\u7684HTTP\u62a5\u6587\uff0cHTTP\u534f\u8bae\u901a\u8fc7\u8fd9\u79cd\u65b9\u5f0f\u5c31\u907f\u514d\u4e86\u7c98\u5305\u95ee\u9898\u3002<\/li>\n\n\n\n<li>\u6ca1\u6709\u5bf9\u5e94\u7684\u8f93\u5165\u8f93\u51fa\u7f13\u51b2\u533a\u3002\u4ee3\u7801\u4e2d\u76f4\u63a5\u5c06\u8bfb\u53d6\u7684\u6570\u636e\u5b58\u50a8\u5230\u4e86\u5b57\u7b26\u6570\u7ec4buffer\u5f53\u4e2d\uff0c\u8fd9\u662f\u4e0d\u4e25\u8c28\u7684\uff0c\u56e0\u4e3a\u672c\u6b21\u6570\u636e\u8bfb\u53d6\u53ef\u80fd\u5e76\u6ca1\u6709\u8bfb\u53d6\u5230\u4e00\u4e2a\u5b8c\u6574\u7684\u62a5\u6587\uff0c\u6b64\u65f6\u670d\u52a1\u5668\u5c31\u4e0d\u80fd\u8fdb\u884c\u6570\u636e\u7684\u5206\u6790\u5904\u7406\uff0c\u5e94\u8be5\u5c06\u8bfb\u53d6\u5230\u7684\u6570\u636e\u5b58\u50a8\u5230\u4e00\u4e2a\u8f93\u5165\u7f13\u51b2\u533a\u5f53\u4e2d\uff0c\u5f53\u8bfb\u53d6\u5230\u4e00\u4e2a\u5b8c\u6574\u7684\u62a5\u6587\u540e\u518d\u8ba9\u670d\u52a1\u5668\u8fdb\u884c\u5904\u7406\u3002\u6b64\u5916\uff0c\u5982\u679c\u670d\u52a1\u5668\u8981\u80fd\u591f\u5bf9\u5ba2\u6237\u7aef\u8fdb\u884c\u54cd\u5e94\uff0c\u90a3\u4e48\u670d\u52a1\u5668\u7684\u54cd\u5e94\u6570\u636e\u4e5f\u4e0d\u5e94\u8be5\u76f4\u63a5\u8c03\u7528write\u51fd\u6570\u53d1\u9001\u7ed9\u5ba2\u6237\u7aef\uff0c\u5e94\u8be5\u5148\u5b58\u50a8\u5230\u4e00\u4e2a\u8f93\u51fa\u7f13\u51b2\u533a\u5f53\u4e2d\uff0c\u56e0\u4e3a\u54cd\u5e94\u6570\u636e\u53ef\u80fd\u5f88\u5e9e\u5927\uff0c\u65e0\u6cd5\u4e00\u6b21\u53d1\u9001\u5b8c\u6bd5\uff0c\u53ef\u80fd\u9700\u8981\u8fdb\u884c\u5206\u6279\u53d1\u9001\u3002<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">select\u7684\u4f18\u70b9<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u53ef\u4ee5\u540c\u65f6\u7b49\u5f85\u591a\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\uff0c\u5e76\u4e14\u53ea\u8d1f\u8d23\u7b49\u5f85\uff0c\u5b9e\u9645\u7684IO\u64cd\u4f5c\u7531accept\u3001read\u3001write\u7b49\u63a5\u53e3\u6765\u5b8c\u6210\uff0c\u8fd9\u4e9b\u63a5\u53e3\u5728\u8fdb\u884cIO\u64cd\u4f5c\u65f6\u4e0d\u4f1a\u88ab\u963b\u585e\u3002<\/li>\n\n\n\n<li>select\u540c\u65f6\u7b49\u5f85\u591a\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\uff0c\u56e0\u6b64\u53ef\u4ee5\u5c06\u201c\u7b49\u201d\u7684\u65f6\u95f4\u91cd\u53e0\uff0c\u63d0\u9ad8\u4e86IO\u7684\u6548\u7387\u3002<\/li>\n<\/ul>\n\n\n\n<p>\u5f53\u7136\uff0c\u8fd9\u4e5f\u662f\u6240\u6709\u591a\u8def\u8f6c\u63a5\u63a5\u53e3\u7684\u4f18\u70b9\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">select\u7684\u7f3a\u70b9<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u6bcf\u6b21\u8c03\u7528select\uff0c\u90fd\u9700\u8981\u624b\u52a8\u8bbe\u7f6efd\u96c6\u5408\uff0c\u4ece\u63a5\u53e3\u4f7f\u7528\u89d2\u5ea6\u6765\u8bf4\u4e5f\u975e\u5e38\u4e0d\u4fbf\u3002<\/li>\n\n\n\n<li>\u6bcf\u6b21\u8c03\u7528select\uff0c\u90fd\u9700\u8981\u628afd\u96c6\u5408\u4ece\u7528\u6237\u6001\u62f7\u8d1d\u5230\u5185\u6838\u6001\uff0c\u8fd9\u4e2a\u5f00\u9500\u5728fd\u5f88\u591a\u65f6\u4f1a\u5f88\u5927\u3002<\/li>\n\n\n\n<li>\u540c\u65f6\u6bcf\u6b21\u8c03\u7528select\u90fd\u9700\u8981\u5728\u5185\u6838\u904d\u5386\u4f20\u9012\u8fdb\u6765\u7684\u6240\u6709fd\uff0c\u8fd9\u4e2a\u5f00\u9500\u5728fd\u5f88\u591a\u65f6\u4e5f\u5f88\u5927\u3002<\/li>\n\n\n\n<li>select\u53ef\u76d1\u63a7\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u6570\u91cf\u592a\u5c11\u3002<\/li>\n<\/ul>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>select\u53ef\u76d1\u63a7\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u4e2a\u6570<\/p>\n<\/blockquote>\n\n\n\n<p>\u8c03\u7528select\u51fd\u6570\u65f6\u4f20\u5165\u7684readfds\u3001writefds\u4ee5\u53caexceptfds\u90fd\u662ffd_set\u7ed3\u6784\u7684\uff0cfd_set\u7ed3\u6784\u672c\u8d28\u662f\u4e00\u4e2a\u4f4d\u56fe\uff0c\u5b83\u7528\u6bcf\u4e00\u4e2a\u6bd4\u7279\u4f4d\u6765\u6807\u8bb0\u4e00\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\uff0c\u56e0\u6b64select\u53ef\u76d1\u63a7\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u4e2a\u6570\u662f\u53d6\u51b3\u4e8efd_set\u7c7b\u578b\u7684\u6bd4\u7279\u4f4d\u4e2a\u6570\u7684\u3002<\/p>\n\n\n\n<p>\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0b\u4ee3\u7801\u6765\u770b\u770bfd_set\u7c7b\u578b\u6709\u591a\u5c11\u4e2a\u6bd4\u7279\u4f4d\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>#include &lt;iostream&gt;\n#include &lt;sys\/types.h&gt;\n\nint main()\n{\n\n    std::cout &lt;&lt; sizeof(fd_set)* 8 &lt;&lt; std::endl;\n    return 0;\n}<\/code><\/pre>\n\n\n\n<p>\u8fd0\u884c\u4ee3\u7801\u540e\u53ef\u4ee5\u770b\u5230\uff0c\u5176\u5b9eselect\u53ef\u76d1\u63a7\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u4e2a\u6570\u5c31\u662f1024\u4e2a\u3002<img decoding=\"async\" src=\"https:\/\/cdn.codergodv.xyz\/b1b7d51eb40a5f5b5d4b964ae3523a3b.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"><\/p>\n\n\n\n<p>\u56e0\u6b64\u6211\u4eec\u5b9e\u73b0\u7684select\u670d\u52a1\u5668\u5f53\u4e2d\u5c06fd_array\u6570\u7ec4\u7684\u5927\u5c0f\u8bbe\u7f6e\u4e3a1024\u662f\u8db3\u591f\u7684\uff0c\u56e0\u4e3areadfds\u5f53\u4e2d\u6700\u591a\u5c31\u53ea\u80fd\u6dfb\u52a01024\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\uff0c\u4f46\u4e0d\u540c\u73af\u5883\u4e0bfd_set\u7684\u5927\u5c0f\u53ef\u80fd\u662f\u4e0d\u540c\u7684\uff0c\u5e76\u4e14fd_set\u7684\u5927\u5c0f\u4e5f\u662f\u53ef\u4ee5\u8c03\u6574\u7684\uff08\u6d89\u53ca\u91cd\u65b0\u7f16\u8bd1\u5185\u6838\uff09\uff0c\u56e0\u6b64\u4e4b\u524dselect\u670d\u52a1\u5668\u5f53\u4e2d\u5bf9NUM\u7684\u5b8f\u5b9a\u4e49\u6b63\u786e\u5199\u6cd5\u5e94\u8be5\u662f\u8fd9\u6837\u7684\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>#define NUM (sizeof(fd_set)*8)<\/code><\/pre>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>\u4e00\u4e2a\u8fdb\u7a0b\u80fd\u6253\u5f00\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u4e2a\u6570<\/p>\n<\/blockquote>\n\n\n\n<p>\u8fdb\u7a0b\u63a7\u5236\u5757task_struct\u5f53\u4e2d\u6709\u4e00\u4e2afiles\u6307\u9488\uff0c\u8be5\u6307\u9488\u6307\u5411\u4e00\u4e2astruct files_struct\u7ed3\u6784\uff0c\u8fdb\u7a0b\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u8868fd_array\u5c31\u5b58\u50a8\u5728\u8be5\u7ed3\u6784\u5f53\u4e2d\uff0c\u5176\u4e2d\u6587\u4ef6\u63cf\u8ff0\u7b26\u8868fd_array\u7684\u5927\u5c0f\u5b9a\u4e49\u4e3a<code>NR_OPEN_DEFAULT<\/code>\uff0c<code>NR_OPEN_DEFAULT<\/code>\u7684\u503c\u5b9e\u9645\u5c31\u662f32\u3002<\/p>\n\n\n\n<p>\u4f46\u5e76\u4e0d\u610f\u5473\u7740\u4e00\u4e2a\u8fdb\u7a0b\u6700\u591a\u53ea\u80fd\u6253\u5f0032\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\uff0c\u8fdb\u7a0b\u80fd\u6253\u5f00\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u4e2a\u6570\u5b9e\u9645\u662f\u53ef\u4ee5\u6269\u5c55\u7684\uff0c\u6bd4\u5982\u6211\u5f53\u524d\u4f7f\u7528\u7684\u4e91\u670d\u52a1\u5668\u9ed8\u8ba4\u5c31\u662f\u628a\u8fdb\u7a0b\u80fd\u6253\u5f00\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u8bbe\u7f6e\u5f97\u5f88\u9ad8\u7684\uff0c\u901a\u8fc7<code>ulimit -a<\/code>\u547d\u4ee4\u5c31\u53ef\u4ee5\u770b\u5230\u8fdb\u7a0b\u80fd\u6253\u5f00\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u4e0a\u9650\u3002<img decoding=\"async\" src=\"https:\/\/cdn.codergodv.xyz\/823a1456a2f262c11aca3be49ca2f0ce.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"><\/p>\n\n\n\n<p>\u56e0\u6b64select\u53ef\u76d1\u63a7\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u4e2a\u6570\u592a\u5c11\u662f\u4e00\u4e2a\u5f88\u5927\u7684\u95ee\u9898\uff0c\u6bd4\u5982select\u53ef\u76d1\u63a7\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u4e2a\u6570\u662f1024\uff0c\u9664\u53bb\u5176\u4e2d\u7684\u4e00\u4e2a\u76d1\u542c\u5957\u63a5\u5b57\uff0c\u90a3\u4e48select\u670d\u52a1\u5668\u6700\u591a\u53ea\u80fd\u8fde\u63a51023\u4e2a\u5ba2\u6237\u7aef\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">select\u7684\u9002\u7528\u573a\u666f<\/h3>\n\n\n\n<p>\u591a\u8def\u8f6c\u63a5\u63a5\u53e3select\u3001poll\u548cepoll\uff0c\u9700\u8981\u5728\u4e00\u5b9a\u7684\u573a\u666f\u4e0b\u4f7f\u7528\uff0c\u5982\u679c\u573a\u666f\u9009\u62e9\u7684\u4e0d\u9002\u5b9c\uff0c\u53ef\u80fd\u4f1a\u9002\u5f97\u5176\u53cd\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u591a\u8def\u8f6c\u63a5\u63a5\u53e3\u4e00\u822c\u9002\u7528\u4e8e\u591a\u8fde\u63a5\uff0c\u4e14\u591a\u8fde\u63a5\u4e2d\u53ea\u6709\u5c11\u90e8\u5206\u8fde\u63a5\u6bd4\u8f83\u6d3b\u8dc3\u3002\u56e0\u4e3a\u5c11\u91cf\u8fde\u63a5\u6bd4\u8f83\u6d3b\u8dc3\uff0c\u4e5f\u5c31\u610f\u5473\u7740\u51e0\u4e4e\u6240\u6709\u7684\u8fde\u63a5\u5728\u8fdb\u884cIO\u64cd\u4f5c\u65f6\uff0c\u90fd\u9700\u8981\u82b1\u8d39\u5927\u91cf\u65f6\u95f4\u6765\u7b49\u5f85\u4e8b\u4ef6\u5c31\u7eea\uff0c\u6b64\u65f6\u4f7f\u7528\u591a\u8def\u8f6c\u63a5\u63a5\u53e3\u5c31\u53ef\u4ee5\u5c06\u8fd9\u4e9b\u7b49\u7684\u4e8b\u4ef6\u8fdb\u884c\u91cd\u53e0\uff0c\u63d0\u9ad8IO\u6548\u7387\u3002<\/li>\n\n\n\n<li>\u5bf9\u4e8e\u591a\u8fde\u63a5\u4e2d\u5927\u90e8\u5206\u8fde\u63a5\u90fd\u5f88\u6d3b\u8dc3\u7684\u573a\u666f\uff0c\u5176\u5b9e\u5e76\u4e0d\u9002\u5408\u4f7f\u7528\u591a\u8def\u8f6c\u63a5\u3002\u56e0\u4e3a\u6bcf\u4e2a\u8fde\u63a5\u90fd\u5f88\u6d3b\u8dc3\uff0c\u4e5f\u5c31\u610f\u5473\u7740\u4efb\u4f55\u65f6\u523b\u6bcf\u4e2a\u8fde\u63a5\u4e0a\u7684\u4e8b\u4ef6\u57fa\u672c\u90fd\u662f\u5c31\u7eea\u7684\uff0c\u6b64\u65f6\u6839\u672c\u4e0d\u9700\u8981\u52a8\u7528\u591a\u8def\u8f6c\u63a5\u63a5\u53e3\u6765\u5e2e\u6211\u4eec\u8fdb\u884c\u7b49\u5f85\uff0c\u6bd5\u7adf\u4f7f\u7528\u591a\u8def\u8f6c\u63a5\u63a5\u53e3\u4e5f\u662f\u9700\u8981\u82b1\u8d39\u7cfb\u7edf\u7684\u65f6\u95f4\u548c\u7a7a\u95f4\u8d44\u6e90\u7684\u3002<\/li>\n<\/ul>\n\n\n\n<p>\u591a\u8fde\u63a5\u4e2d\u53ea\u6709\u5c11\u91cf\u8fde\u63a5\u662f\u6bd4\u8f83\u6d3b\u8dc3\u7684\uff0c\u6bd4\u5982\u804a\u5929\u5de5\u5177\uff0c\u6211\u4eec\u767b\u5f55QQ\u540e\u5927\u90e8\u5206\u65f6\u95f4\u5176\u5b9e\u662f\u6ca1\u6709\u804a\u5929\u7684\uff0c\u6b64\u65f6\u670d\u52a1\u5668\u7aef\u4e0d\u53ef\u80fd\u8c03\u7528\u4e00\u4e2aread\u51fd\u6570\u963b\u585e\u7b49\u5f85\u8bfb\u4e8b\u4ef6\u5c31\u7eea\u3002<\/p>\n\n\n\n<p>\u591a\u8fde\u63a5\u4e2d\u5927\u90e8\u5206\u8fde\u63a5\u90fd\u5f88\u6d3b\u8dc3\uff0c\u6bd4\u5982\u4f01\u4e1a\u5f53\u4e2d\u8fdb\u884c\u6570\u636e\u5907\u4efd\u65f6\uff0c\u4e24\u53f0\u670d\u52a1\u5668\u4e4b\u95f4\u4e0d\u65ad\u5728\u4ea4\u4e92\u6570\u636e\uff0c\u8fd9\u65f6\u7684\u8fde\u63a5\u662f\u7279\u522b\u6d3b\u8dc3\u7684\uff0c\u51e0\u4e4e\u4e0d\u9700\u8981\u7b49\u7684\u8fc7\u7a0b\uff0c\u4e5f\u5c31\u6ca1\u5fc5\u8981\u4f7f\u7528\u591a\u8def\u8f6c\u63a5\u63a5\u53e3\u4e86\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">I\/O\u591a\u8def\u8f6c\u63a5\u4e4bpoll<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">poll\u521d\u8bc6<\/h3>\n\n\n\n<p>poll\u4e5f\u662f\u7cfb\u7edf\u63d0\u4f9b\u7684\u4e00\u4e2a\u591a\u8def\u8f6c\u63a5\u63a5\u53e3\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>poll\u7cfb\u7edf\u8c03\u7528\u4e5f\u53ef\u4ee5\u8ba9\u6211\u4eec\u7684\u7a0b\u5e8f\u540c\u65f6\u76d1\u89c6\u591a\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\u4e0a\u7684\u4e8b\u4ef6\u662f\u5426\u5c31\u7eea\uff0c\u548cselect\u7684\u5b9a\u4f4d\u662f\u4e00\u6837\u7684\uff0c\u9002\u7528\u573a\u666f\u4e5f\u662f\u4e00\u6837\u7684\u3002<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">poll\u51fd\u6570<\/h3>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>poll\u51fd\u6570<\/p>\n<\/blockquote>\n\n\n\n<p>poll\u51fd\u6570\u7684\u51fd\u6570\u539f\u578b\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>int poll(struct pollfd *fds, nfds_t nfds, int timeout);<\/code><\/pre>\n\n\n\n<p>\u53c2\u6570\u8bf4\u660e\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>fds\uff1a\u4e00\u4e2apoll\u51fd\u6570\u76d1\u89c6\u7684\u7ed3\u6784\u5217\u8868\uff0c\u6bcf\u4e00\u4e2a\u5143\u7d20\u5305\u542b\u4e09\u90e8\u5206\u5185\u5bb9\uff1a\u6587\u4ef6\u63cf\u8ff0\u7b26\u3001\u76d1\u89c6\u7684\u4e8b\u4ef6\u96c6\u5408\u3001\u5c31\u7eea\u7684\u4e8b\u4ef6\u96c6\u5408\u3002<\/li>\n\n\n\n<li>nfds\uff1a\u8868\u793afds\u6570\u7ec4\u7684\u957f\u5ea6\u3002<\/li>\n\n\n\n<li>timeout\uff1a\u8868\u793apoll\u51fd\u6570\u7684\u8d85\u65f6\u65f6\u95f4\uff0c\u5355\u4f4d\u662f\u6beb\u79d2\uff08ms\uff09\u3002<\/li>\n<\/ul>\n\n\n\n<p>\u53c2\u6570timeout\u7684\u53d6\u503c\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>-1\uff1apoll\u8c03\u7528\u540e\u8fdb\u884c\u963b\u585e\u7b49\u5f85\uff0c\u76f4\u5230\u88ab\u76d1\u89c6\u7684\u67d0\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\u4e0a\u7684\u67d0\u4e2a\u4e8b\u4ef6\u5c31\u7eea\u3002<\/li>\n\n\n\n<li>0\uff1apoll\u8c03\u7528\u540e\u8fdb\u884c\u975e\u963b\u585e\u7b49\u5f85\uff0c\u65e0\u8bba\u88ab\u76d1\u89c6\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u4e0a\u7684\u4e8b\u4ef6\u662f\u5426\u5c31\u7eea\uff0cpoll\u68c0\u6d4b\u540e\u90fd\u4f1a\u7acb\u5373\u8fd4\u56de\u3002<\/li>\n\n\n\n<li>\u7279\u5b9a\u7684\u65f6\u95f4\u503c\uff1apoll\u8c03\u7528\u540e\u5728\u6307\u5b9a\u7684\u65f6\u95f4\u5185\u8fdb\u884c\u963b\u585e\u7b49\u5f85\uff0c\u5982\u679c\u88ab\u76d1\u89c6\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u4e0a\u4e00\u76f4\u6ca1\u6709\u4e8b\u4ef6\u5c31\u7eea\uff0c\u5219\u5728\u8be5\u65f6\u95f4\u540epoll\u8fdb\u884c\u8d85\u65f6\u8fd4\u56de\u3002<\/li>\n<\/ul>\n\n\n\n<p>\u8fd4\u56de\u503c\u8bf4\u660e\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5982\u679c\u51fd\u6570\u8c03\u7528\u6210\u529f\uff0c\u5219\u8fd4\u56de\u6709\u4e8b\u4ef6\u5c31\u7eea\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u4e2a\u6570\u3002<\/li>\n\n\n\n<li>\u5982\u679ctimeout\u65f6\u95f4\u8017\u5c3d\uff0c\u5219\u8fd4\u56de0\u3002<\/li>\n\n\n\n<li>\u5982\u679c\u51fd\u6570\u8c03\u7528\u5931\u8d25\uff0c\u5219\u8fd4\u56de-1\uff0c\u540c\u65f6\u9519\u8bef\u7801\u4f1a\u88ab\u8bbe\u7f6e\u3002<\/li>\n<\/ul>\n\n\n\n<p>poll\u8c03\u7528\u5931\u8d25\u65f6\uff0c\u9519\u8bef\u7801\u53ef\u80fd\u88ab\u8bbe\u7f6e\u4e3a\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>EFAULT<\/code>\uff1afds\u6570\u7ec4\u4e0d\u5305\u542b\u5728\u8c03\u7528\u7a0b\u5e8f\u7684\u5730\u5740\u7a7a\u95f4\u4e2d\u3002<\/li>\n\n\n\n<li><code>EINTR<\/code>\uff1a\u6b64\u8c03\u7528\u88ab\u4fe1\u53f7\u6240\u4e2d\u65ad\u3002<\/li>\n\n\n\n<li><code>EINVAL<\/code>\uff1anfds\u503c\u8d85\u8fc7RLIMIT_NOFILE\u503c\u3002<\/li>\n\n\n\n<li><code>ENOMEM<\/code>\uff1a\u6838\u5fc3\u5185\u5b58\u4e0d\u8db3\u3002<\/li>\n<\/ul>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>struct pollfd\u7ed3\u6784<\/p>\n<\/blockquote>\n\n\n\n<p>struct pollfd\u7ed3\u6784\u5f53\u4e2d\u5305\u542b\u4e09\u4e2a\u6210\u5458\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>fd\uff1a\u7279\u5b9a\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\uff0c\u82e5\u8bbe\u7f6e\u4e3a\u8d1f\u503c\u5219\u5ffd\u7565events\u5b57\u6bb5\u5e76\u4e14revents\u5b57\u6bb5\u8fd4\u56de0\u3002<\/li>\n\n\n\n<li>events\uff1a\u9700\u8981\u76d1\u89c6\u8be5\u6587\u4ef6\u63cf\u8ff0\u7b26\u4e0a\u7684\u54ea\u4e9b\u4e8b\u4ef6\u3002<\/li>\n\n\n\n<li>revents\uff1apoll\u51fd\u6570\u8fd4\u56de\u65f6\u544a\u77e5\u7528\u6237\u8be5\u6587\u4ef6\u63cf\u8ff0\u7b26\u4e0a\u7684\u54ea\u4e9b\u4e8b\u4ef6\u5df2\u7ecf\u5c31\u7eea\u3002<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/cdn.codergodv.xyz\/d867fc0157be87d3cf8c9456ad80fc6e.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/cdn.codergodv.xyz\/d867fc0157be87d3cf8c9456ad80fc6e.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/div><\/figure>\n\n\n\n<p>events\u548crevents\u7684\u53d6\u503c\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-center\" data-align=\"center\">\u4e8b\u4ef6<\/th><th class=\"has-text-align-center\" data-align=\"center\">\u63cf\u8ff0<\/th><th class=\"has-text-align-center\" data-align=\"center\">\u662f\u5426\u53ef\u4f5c\u4e3a\u8f93\u5165<\/th><th class=\"has-text-align-center\" data-align=\"center\">\u662f\u5426\u53ef\u4f5c\u4e3a\u8f93\u51fa<\/th><\/tr><\/thead><tbody><tr><td class=\"has-text-align-center\" data-align=\"center\">POLLIN<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u6570\u636e\uff08\u5305\u62ec\u666e\u901a\u6570\u636e\u548c\u4f18\u5148\u6570\u636e\uff09\u53ef\u8bfb<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u662f<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u662f<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">POLLRDNORM<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u666e\u901a\u6570\u636e\u53ef\u8bfb<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u662f<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u662f<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">POLLRDBAND<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u4f18\u5148\u7ea7\u5e26\u6570\u636e\u53ef\u8bfb\uff08Linux\u4e0d\u652f\u6301\uff09<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u662f<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u662f<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">POLLPRI<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u9ad8\u4f18\u5148\u7ea7\u6570\u636e\u53ef\u8bfb\uff0c\u6bd4\u5982TCP\u5e26\u5916\u6570\u636e<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u662f<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u662f<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">POLLOUT<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u6570\u636e\uff08\u5305\u62ec\u666e\u901a\u6570\u636e\u548c\u4f18\u5148\u6570\u636e\uff09\u53ef\u5199<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u662f<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u662f<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">POLLWRNORM<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u666e\u901a\u6570\u636e\u53ef\u5199<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u662f<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u662f<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">POLLWRBAND<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u4f18\u5148\u7ea7\u5e26\u6570\u636e\u53ef\u5199<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u662f<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u662f<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">POLLRDHUP<\/td><td class=\"has-text-align-center\" data-align=\"center\">TCP\u8fde\u63a5\u88ab\u5bf9\u65b9\u5173\u95ed\uff0c\u6216\u8005\u5bf9\u65b9\u5173\u95ed\u4e86\u5199\u64cd\u4f5c\uff0c\u5b83\u7531GNU\u5f15\u5165<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u662f<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u662f<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">POLLERR<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u9519\u8bef<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u5426<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u662f<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">POLLHUP<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u6302\u8d77\u3002\u6bd4\u5982\u7ba1\u9053\u7684\u5199\u7aef\u88ab\u5173\u95ed\u540e\uff0c\u8bfb\u7aef\u63cf\u8ff0\u7b26\u4e0a\u5c06\u6536\u5230POLLHUP\u4e8b\u4ef6<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u5426<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u662f<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">POLLNVAL<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u6587\u4ef6\u63cf\u8ff0\u7b26\u6ca1\u6709\u6253\u5f00<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u5426<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u662f<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>\u8fd9\u4e9b\u53d6\u503c\u5b9e\u9645\u90fd\u662f\u4ee5\u5b8f\u7684\u65b9\u5f0f\u8fdb\u884c\u5b9a\u4e49\u7684\uff0c\u5b83\u4eec\u7684\u4e8c\u8fdb\u5236\u5e8f\u5217\u5f53\u4e2d\u6709\u4e14\u53ea\u6709\u4e00\u4e2a\u6bd4\u7279\u4f4d\u662f1\uff0c\u4e14\u4e3a1\u7684\u6bd4\u7279\u4f4d\u662f\u5404\u4e0d\u76f8\u540c\u7684\u3002<img decoding=\"async\" src=\"https:\/\/cdn.codergodv.xyz\/b64df7a199fa07104cfc5c30c275b93d.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u56e0\u6b64\u5728\u8c03\u7528poll\u51fd\u6570\u4e4b\u524d\uff0c\u53ef\u4ee5\u901a\u8fc7\u6216\u8fd0\u7b97\u7b26\u5c06\u8981\u76d1\u89c6\u7684\u4e8b\u4ef6\u6dfb\u52a0\u5230events\u6210\u5458\u5f53\u4e2d\u3002<\/li>\n\n\n\n<li>\u5728poll\u51fd\u6570\u8fd4\u56de\u540e\uff0c\u53ef\u4ee5\u901a\u8fc7\u4e0e\u8fd0\u7b97\u7b26\u68c0\u6d4brevents\u6210\u5458\u4e2d\u662f\u5426\u5305\u542b\u7279\u5b9a\u4e8b\u4ef6\uff0c\u4ee5\u5f97\u77e5\u5bf9\u5e94\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u7279\u5b9a\u4e8b\u4ef6\u662f\u5426\u5c31\u7eea\u3002<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">poll\u670d\u52a1\u5668<\/h3>\n\n\n\n<p>poll\u7684\u5de5\u4f5c\u6d41\u7a0b\u548cselect\u662f\u57fa\u672c\u7c7b\u4f3c\u7684\uff0c\u8fd9\u91cc\u6211\u4eec\u4e5f\u5b9e\u73b0\u4e00\u4e2a\u7b80\u5355poll\u670d\u52a1\u5668\uff0c\u8be5\u670d\u52a1\u5668\u4e5f\u53ea\u662f\u8bfb\u53d6\u5ba2\u6237\u7aef\u53d1\u6765\u7684\u6570\u636e\u5e76\u8fdb\u884c\u6253\u5370\u3002<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>PollServer\u7c7b<\/p>\n<\/blockquote>\n\n\n\n<p>PollServer\u7c7b\u5f53\u4e2d\u4e5f\u53ea\u9700\u8981\u5305\u542b\u76d1\u542c\u5957\u63a5\u5b57\u548c\u7aef\u53e3\u53f7\u4e24\u4e2a\u6210\u5458\u53d8\u91cf\uff0c\u5728poll\u670d\u52a1\u5668\u7ed1\u5b9a\u65f6\u76f4\u63a5\u5c06IP\u5730\u5740\u8bbe\u7f6e\u4e3aINADDR_ANY\u5c3d\u5373\u53ef\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5728\u6784\u9020PollServer\u5bf9\u8c61\u65f6\uff0c\u9700\u8981\u6307\u660epoll\u670d\u52a1\u5668\u7684\u7aef\u53e3\u53f7\uff0c\u5f53\u7136\u4e5f\u53ef\u4ee5\u5728\u521d\u59cb\u5316poll\u670d\u52a1\u5668\u7684\u65f6\u5019\u6307\u660e\u3002<\/li>\n\n\n\n<li>\u5728\u521d\u59cb\u5316poll\u670d\u52a1\u5668\u7684\u65f6\u5019\u8c03\u7528Socket\u7c7b\u5f53\u4e2d\u7684\u51fd\u6570\uff0c\u4f9d\u6b21\u8fdb\u884c\u5957\u63a5\u5b57\u7684\u521b\u5efa\u3001\u7ed1\u5b9a\u548c\u76d1\u542c\u5373\u53ef\uff0c\u8fd9\u91cc\u7684Socket\u7c7b\u548c\u4e4b\u524d\u5b9e\u73b0\u7684\u4e00\u6a21\u4e00\u6837\u3002<\/li>\n\n\n\n<li>\u5728\u6790\u6784\u51fd\u6570\u4e2d\u53ef\u4ee5\u9009\u62e9\u8c03\u7528close\u51fd\u6570\u5c06\u76d1\u542c\u5957\u63a5\u5b57\u8fdb\u884c\u5173\u95ed\uff0c\u4f46\u5b9e\u9645\u4e5f\u53ef\u4ee5\u4e0d\u8fdb\u884c\u8be5\u52a8\u4f5c\uff0c\u56e0\u4e3a\u670d\u52a1\u5668\u8fd0\u884c\u540e\u4e00\u822c\u662f\u4e0d\u9000\u51fa\u7684\u3002<\/li>\n<\/ul>\n\n\n\n<p>\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>#pragma once\n\n#include \"socket.hpp\"\n#include &lt;poll.h&gt;\n\n#define BACK_LOG 5\n\nclass PollServer{\n\nprivate:\n    int _listen_sock; \/\/\u76d1\u542c\u5957\u63a5\u5b57\n    int _port; \/\/\u7aef\u53e3\u53f7\npublic:\n    PollServer(int port)\n        : _port(port)\n    {\n            }\n    void InitPollServer()\n    {\n\n        _listen_sock = Socket::SocketCreate();\n        Socket::SocketBind(_listen_sock, _port);\n        Socket::SocketListen(_listen_sock, BACK_LOG);\n    }\n    ~PollServer()\n    {\n\n        if (_listen_sock &gt;= 0){\n\n            close(_listen_sock);\n        }\n    }\n};<\/code><\/pre>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>\u8fd0\u884c\u670d\u52a1\u5668<\/p>\n<\/blockquote>\n\n\n\n<p>\u670d\u52a1\u5668\u521d\u59cb\u5316\u5b8c\u6bd5\u540e\u5c31\u53ef\u4ee5\u5f00\u59cb\u8fd0\u884c\u4e86\uff0c\u800cpoll\u670d\u52a1\u5668\u8981\u505a\u7684\u5c31\u662f\u4e0d\u65ad\u8c03\u7528poll\u51fd\u6570\uff0c\u5f53\u4e8b\u4ef6\u5c31\u7eea\u65f6\u5bf9\u5e94\u6267\u884c\u67d0\u79cd\u52a8\u4f5c\u5373\u53ef\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u9996\u5148\uff0c\u5728poll\u670d\u52a1\u5668\u5f00\u59cb\u6b7b\u5faa\u73af\u8c03\u7528poll\u51fd\u6570\u4e4b\u524d\uff0c\u9700\u8981\u5b9a\u4e49\u4e00\u4e2afds\u6570\u7ec4\uff0c\u8be5\u6570\u7ec4\u5f53\u4e2d\u7684\u6bcf\u4e2a\u4f4d\u7f6e\u90fd\u662f\u4e00\u4e2astruct pollfd\u7ed3\u6784\uff0c\u540e\u7eed\u8c03\u7528poll\u51fd\u6570\u65f6\u4f1a\u4f5c\u4e3a\u53c2\u6570\u8fdb\u884c\u4f20\u5165\u3002\u5148\u5c06fds\u6570\u7ec4\u5f53\u4e2d\u6bcf\u4e2a\u4f4d\u7f6e\u521d\u59cb\u5316\u4e3a\u65e0\u6548\uff0c\u5e76\u5c06\u76d1\u542c\u5957\u63a5\u5b57\u6dfb\u52a0\u5230fds\u6570\u7ec4\u5f53\u4e2d\uff0c\u8868\u793a\u670d\u52a1\u5668\u521a\u5f00\u59cb\u8fd0\u884c\u65f6\u53ea\u9700\u8981\u76d1\u89c6\u76d1\u542c\u5957\u63a5\u5b57\u7684\u8bfb\u4e8b\u4ef6\u3002<\/li>\n\n\n\n<li>\u6b64\u540e\uff0cpoll\u670d\u52a1\u5668\u5c31\u4e0d\u65ad\u8c03\u7528poll\u51fd\u6570\u76d1\u89c6\u8bfb\u4e8b\u4ef6\u662f\u5426\u5c31\u7eea\u3002\u5982\u679cpoll\u51fd\u6570\u7684\u8fd4\u56de\u503c\u5927\u4e8e0\uff0c\u5219\u8bf4\u660epoll\u51fd\u6570\u8c03\u7528\u6210\u529f\uff0c\u6b64\u65f6\u5df2\u7ecf\u6709\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u8bfb\u4e8b\u4ef6\u5c31\u7eea\uff0c\u63a5\u4e0b\u6765\u5c31\u5e94\u8be5\u5bf9\u5c31\u7eea\u4e8b\u4ef6\u8fdb\u884c\u5904\u7406\u3002\u5982\u679cpoll\u51fd\u6570\u7684\u8fd4\u56de\u503c\u7b49\u4e8e0\uff0c\u5219\u8bf4\u660etimeout\u65f6\u95f4\u8017\u5c3d\uff0c\u6b64\u65f6\u76f4\u63a5\u51c6\u5907\u8fdb\u884c\u4e0b\u4e00\u6b21poll\u8c03\u7528\u5373\u53ef\u3002\u5982\u679cpoll\u51fd\u6570\u7684\u8fd4\u56de\u503c\u4e3a-1\uff0c\u5219\u8bf4\u660epoll\u8c03\u7528\u5931\u8d25\uff0c\u6b64\u65f6\u4e5f\u8ba9\u670d\u52a1\u5668\u51c6\u5907\u8fdb\u884c\u4e0b\u4e00\u6b21poll\u8c03\u7528\uff0c\u4f46\u5b9e\u9645\u5e94\u8be5\u8fdb\u4e00\u6b65\u5224\u65ad\u9519\u8bef\u7801\uff0c\u6839\u636e\u9519\u8bef\u7801\u6765\u5224\u65ad\u662f\u5426\u5e94\u8be5\u7ee7\u7eed\u8c03\u7528poll\u51fd\u6570\u3002<\/li>\n<\/ul>\n\n\n\n<p>\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>#pragma once\n\n#include \"socket.hpp\"\n#include &lt;poll.h&gt;\n\n#define BACK_LOG 5\n#define NUM 1024\n#define DFL_FD - 1\n\nclass PollServer{\n\nprivate:\n    int _listen_sock; \/\/\u76d1\u542c\u5957\u63a5\u5b57\n    int _port; \/\/\u7aef\u53e3\u53f7\npublic:\n    void Run()\n    {\n\n        struct pollfd fds&#91;NUM];\n        ClearPollfds(fds, NUM, DFL_FD); \/\/\u6e05\u7a7a\u6570\u7ec4\u4e2d\u7684\u6240\u6709\u4f4d\u7f6e\n        SetPollfds(fds, NUM, _listen_sock); \/\/\u5c06\u76d1\u542c\u5957\u63a5\u5b57\u6dfb\u52a0\u5230\u6570\u7ec4\u4e2d\uff0c\u5e76\u5173\u5fc3\u5176\u8bfb\u4e8b\u4ef6\n        for (;;){\n\n            switch (poll(fds, NUM, -1)){\n\n            case 0:\n                std::cout &lt;&lt; \"timeout...\" &lt;&lt; std::endl;\n                break;\n            case -1:\n                std::cerr &lt;&lt; \"poll error\" &lt;&lt; std::endl;\n                break;\n            default:\n                \/\/\u6b63\u5e38\u7684\u4e8b\u4ef6\u5904\u7406\n                \/\/std::cout&lt;&lt;\"\u6709\u4e8b\u4ef6\u53d1\u751f...\"&lt;&lt;std::endl;\n                HandlerEvent(fds, NUM);\n                break;\n            }\n        }\n    }\nprivate:\n    void ClearPollfds(struct pollfd fds&#91;], int num, int default_fd)\n    {\n\n        for (int i = 0; i &lt; num; i++){\n\n            fds&#91;i].fd = default_fd;\n            fds&#91;i].events = 0;\n            fds&#91;i].revents = 0;\n        }\n    }\n    bool SetPollfds(struct pollfd fds&#91;], int num, int fd)\n    {\n\n        for (int i = 0; i &lt; num; i++){\n\n            if (fds&#91;i].fd == DFL_FD){\n             \/\/\u8be5\u4f4d\u7f6e\u6ca1\u6709\u88ab\u4f7f\u7528\n                fds&#91;i].fd = fd;\n                fds&#91;i].events |= POLLIN; \/\/\u6dfb\u52a0\u8bfb\u4e8b\u4ef6\u5230events\u5f53\u4e2d\n                return true;\n            }\n        }\n        return false; \/\/fds\u6570\u7ec4\u5df2\u6ee1\n    }\n};<\/code><\/pre>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>\u4e8b\u4ef6\u5904\u7406<\/p>\n<\/blockquote>\n\n\n\n<p>\u5f53poll\u68c0\u6d4b\u5230\u6709\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u8bfb\u4e8b\u4ef6\u5c31\u7eea\uff0c\u5c31\u4f1a\u5728\u5176\u5bf9\u5e94\u7684struct pollfd\u7ed3\u6784\u4e2d\u7684revents\u6210\u5458\u4e2d\u6dfb\u52a0\u8bfb\u4e8b\u4ef6\u5e76\u8fd4\u56de\uff0c\u63a5\u4e0b\u6765poll\u670d\u52a1\u5668\u5c31\u5e94\u8be5\u5bf9\u5c31\u7eea\u4e8b\u4ef6\u8fdb\u884c\u5904\u7406\u4e86\uff0c\u4e8b\u4ef6\u5904\u7406\u8fc7\u7a0b\u5982\u4e0b\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u9996\u5148\u904d\u5386fds\u6570\u7ec4\u4e2d\u7684\u6bcf\u4e2astruct pollfd\u7ed3\u6784\uff0c\u5982\u679c\u8be5\u7ed3\u6784\u5f53\u4e2d\u7684fd\u6709\u6548\uff0c\u4e14revents\u5f53\u4e2d\u5305\u542b\u8bfb\u4e8b\u4ef6\uff0c\u5219\u8bf4\u660e\u8be5\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u8bfb\u4e8b\u4ef6\u5c31\u7eea\uff0c\u63a5\u4e0b\u6765\u5c31\u9700\u8981\u8fdb\u4e00\u6b65\u5224\u65ad\u8be5\u6587\u4ef6\u63cf\u8ff0\u7b26\u662f\u76d1\u542c\u5957\u63a5\u5b57\u8fd8\u662f\u4e0e\u5ba2\u6237\u7aef\u5efa\u7acb\u7684\u5957\u63a5\u5b57\u3002<\/li>\n\n\n\n<li>\u5982\u679c\u662f\u76d1\u542c\u5957\u63a5\u5b57\u7684\u8bfb\u4e8b\u4ef6\u5c31\u7eea\uff0c\u5219\u8c03\u7528accept\u51fd\u6570\u5c06\u5e95\u5c42\u5efa\u7acb\u597d\u7684\u8fde\u63a5\u83b7\u53d6\u4e0a\u6765\uff0c\u5e76\u5c06\u83b7\u53d6\u5230\u7684\u5957\u63a5\u5b57\u6dfb\u52a0\u5230fds\u6570\u7ec4\u5f53\u4e2d\uff0c\u8868\u793a\u4e0b\u4e00\u6b21\u8c03\u7528poll\u51fd\u6570\u65f6\u9700\u8981\u76d1\u89c6\u8be5\u5957\u63a5\u5b57\u7684\u8bfb\u4e8b\u4ef6\u3002<\/li>\n\n\n\n<li>\u5982\u679c\u662f\u4e0e\u5ba2\u6237\u7aef\u5efa\u7acb\u7684\u8fde\u63a5\u5bf9\u5e94\u7684\u8bfb\u4e8b\u4ef6\u5c31\u7eea\uff0c\u5219\u8c03\u7528read\u51fd\u6570\u8bfb\u53d6\u5ba2\u6237\u7aef\u53d1\u6765\u7684\u6570\u636e\uff0c\u5e76\u5c06\u8bfb\u53d6\u5230\u7684\u6570\u636e\u5728\u670d\u52a1\u5668\u7aef\u8fdb\u884c\u6253\u5370\u3002<\/li>\n\n\n\n<li>\u5982\u679c\u5728\u8c03\u7528read\u51fd\u6570\u65f6\u53d1\u73b0\u5ba2\u6237\u7aef\u5c06\u8fde\u63a5\u5173\u95ed\u6216read\u51fd\u6570\u8c03\u7528\u5931\u8d25\uff0c\u5219poll\u670d\u52a1\u5668\u4e5f\u76f4\u63a5\u5173\u95ed\u5bf9\u5e94\u7684\u8fde\u63a5\uff0c\u5e76\u5c06\u8be5\u8fde\u63a5\u5bf9\u5e94\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u4ecefds\u6570\u7ec4\u5f53\u4e2d\u6e05\u9664\uff0c\u8868\u793a\u4e0b\u4e00\u6b21\u8c03\u7528poll\u51fd\u6570\u65f6\u65e0\u9700\u518d\u76d1\u89c6\u8be5\u5957\u63a5\u5b57\u7684\u8bfb\u4e8b\u4ef6\u3002<\/li>\n<\/ul>\n\n\n\n<p>\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>#pragma once\n\n#include \"socket.hpp\"\n#include &lt;poll.h&gt;\n\n#define BACK_LOG 5\n#define NUM 1024\n#define DFL_FD - 1\n\nclass PollServer{\n\nprivate:\n    int _listen_sock; \/\/\u76d1\u542c\u5957\u63a5\u5b57\n    int _port; \/\/\u7aef\u53e3\u53f7\npublic:\n    void HandlerEvent(struct pollfd fds&#91;], int num)\n    {\n\n        for (int i = 0; i &lt; num; i++){\n\n            if (fds&#91;i].fd == DFL_FD){\n             \/\/\u8df3\u8fc7\u65e0\u6548\u7684\u4f4d\u7f6e\n                continue;\n            }\n            if (fds&#91;i].fd == _listen_sock&amp;&amp;fds&#91;i].revents&amp;POLLIN){\n             \/\/\u8fde\u63a5\u4e8b\u4ef6\u5c31\u7eea\n                struct sockaddr_in peer;\n                memset(&amp;peer, 0, sizeof(peer));\n                socklen_t len = sizeof(peer);\n                int sock = accept(_listen_sock, (struct sockaddr*)&amp;peer, &amp;len);\n                if (sock &lt; 0){\n             \/\/\u83b7\u53d6\u8fde\u63a5\u5931\u8d25\n                    std::cerr &lt;&lt; \"accept error\" &lt;&lt; std::endl;\n                    continue;\n                }\n                std::string peer_ip = inet_ntoa(peer.sin_addr);\n                int peer_port = ntohs(peer.sin_port);\n                std::cout &lt;&lt; \"get a new link&#91;\" &lt;&lt; peer_ip &lt;&lt; \":\" &lt;&lt; peer_port &lt;&lt; \"]\" &lt;&lt; std::endl;\n\n                if (!SetPollfds(fds, NUM, sock)){\n             \/\/\u5c06\u83b7\u53d6\u5230\u7684\u5957\u63a5\u5b57\u6dfb\u52a0\u5230fds\u6570\u7ec4\u4e2d\uff0c\u5e76\u5173\u5fc3\u5176\u8bfb\u4e8b\u4ef6\n                    close(sock);\n                    std::cout &lt;&lt; \"poll server is full, close fd: \" &lt;&lt; sock &lt;&lt; std::endl;\n                }\n            }\n            else if (fds&#91;i].revents&amp;POLLIN){\n             \/\/\u8bfb\u4e8b\u4ef6\u5c31\u7eea\n                char buffer&#91;1024];\n                ssize_t size = read(fds&#91;i].fd, buffer, sizeof(buffer)-1);\n                if (size &gt; 0){\n             \/\/\u8bfb\u53d6\u6210\u529f\n                    buffer&#91;size] = '\\0';\n                    std::cout &lt;&lt; \"echo# \" &lt;&lt; buffer &lt;&lt; std::endl;\n                }\n                else if (size == 0){\n             \/\/\u5bf9\u7aef\u8fde\u63a5\u5173\u95ed\n                    std::cout &lt;&lt; \"client quit\" &lt;&lt; std::endl;\n                    close(fds&#91;i].fd);\n                    UnSetPollfds(fds, i); \/\/\u5c06\u8be5\u6587\u4ef6\u63cf\u8ff0\u7b26\u4ecefds\u6570\u7ec4\u4e2d\u6e05\u9664\n                }\n                else{\n\n                    std::cerr &lt;&lt; \"read error\" &lt;&lt; std::endl;\n                    close(fds&#91;i].fd);\n                    UnSetPollfds(fds, i); \/\/\u5c06\u8be5\u6587\u4ef6\u63cf\u8ff0\u7b26\u4ecefds\u6570\u7ec4\u4e2d\u6e05\u9664\n                }\n            }\n        }\n    }\nprivate:\n    bool SetPollfds(struct pollfd fds&#91;], int num, int fd)\n    {\n\n        for (int i = 0; i &lt; num; i++){\n\n            if (fds&#91;i].fd == DFL_FD){\n             \/\/\u8be5\u4f4d\u7f6e\u6ca1\u6709\u88ab\u4f7f\u7528\n                fds&#91;i].fd = fd;\n                fds&#91;i].events |= POLLIN; \/\/\u6dfb\u52a0\u8bfb\u4e8b\u4ef6\u5230events\u5f53\u4e2d\n                return true;\n            }\n        }\n        return false; \/\/fds\u6570\u7ec4\u5df2\u6ee1\n    }\n    void UnSetPollfds(struct pollfd fds&#91;], int pos)\n    {\n\n        fds&#91;pos].fd = DFL_FD;\n        fds&#91;pos].events = 0;\n        fds&#91;pos].revents = 0;\n    }\n};<\/code><\/pre>\n\n\n\n<p><strong>\u8bf4\u660e\u4e00\u4e0b\uff1a<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u56e0\u4e3a\u8fd9\u91cc\u5c06fds\u6570\u7ec4\u7684\u5927\u5c0f\u662f\u56fa\u5b9a\u8bbe\u7f6e\u7684\uff0c\u56e0\u6b64\u5728\u5c06\u65b0\u83b7\u53d6\u8fde\u63a5\u5bf9\u5e94\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u6dfb\u52a0\u5230fds\u6570\u7ec4\u65f6\uff0c\u53ef\u80fd\u4f1a\u56e0\u4e3afds\u6570\u7ec4\u5df2\u6ee1\u800c\u6dfb\u52a0\u5931\u8d25\uff0c\u8fd9\u65f6poll\u670d\u52a1\u5668\u53ea\u80fd\u5c06\u521a\u521a\u83b7\u53d6\u4e0a\u6765\u7684\u8fde\u63a5\u5bf9\u5e94\u7684\u5957\u63a5\u5b57\u8fdb\u884c\u5173\u95ed\u3002<\/li>\n<\/ul>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>poll\u670d\u52a1\u5668\u6d4b\u8bd5<\/p>\n<\/blockquote>\n\n\n\n<p>\u8fd0\u884cpoll\u670d\u52a1\u5668\u65f6\u4e5f\u9700\u8981\u5148\u5b9e\u4f8b\u5316\u51fa\u4e00\u4e2aPollServer\u5bf9\u8c61\uff0c\u5bf9poll\u670d\u52a1\u5668\u8fdb\u884c\u521d\u59cb\u5316\u540e\u5c31\u53ef\u4ee5\u8fd0\u884c\u670d\u52a1\u5668\u4e86\u3002<\/p>\n\n\n\n<p>\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>#include \"poll_server.hpp\"\n#include &lt;string&gt;\n\nstatic void Usage(std::string proc)\n{\n\n    std::cerr &lt;&lt; \"Usage: \" &lt;&lt; proc &lt;&lt; \" port\" &lt;&lt; std::endl;\n}\n\nint main(int argc, char* argv&#91;])\n{\n\n    if (argc != 2){\n\n        Usage(argv&#91;0]);\n        exit(1);\n    }\n    int port = atoi(argv&#91;1]);\n    PollServer* svr = new PollServer(port);\n    svr-&gt;InitPollServer();\n    svr-&gt;Run();\n\n    return 0;\n}<\/code><\/pre>\n\n\n\n<p>\u56e0\u4e3a\u6211\u4eec\u7f16\u5199\u7684poll\u670d\u52a1\u5668\u5728\u8c03\u7528poll\u51fd\u6570\u65f6\uff0c\u5c06timeout\u7684\u503c\u8bbe\u7f6e\u6210\u4e86-1\uff0c\u56e0\u6b64\u8fd0\u884c\u670d\u52a1\u5668\u540e\u5982\u679c\u6ca1\u6709\u5ba2\u6237\u7aef\u53d1\u6765\u8fde\u63a5\u8bf7\u6c42\uff0c\u90a3\u4e48\u670d\u52a1\u5668\u5c31\u4f1a\u5728\u8c03\u7528poll\u51fd\u6570\u540e\u8fdb\u884c\u963b\u585e\u7b49\u5f85\u3002<img decoding=\"async\" src=\"https:\/\/cdn.codergodv.xyz\/b35bd0c67c3b15e0b7ef09e29d7f1a47.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"><\/p>\n\n\n\n<p>\u5f53\u6211\u4eec\u7528telnet\u5de5\u5177\u8fde\u63a5poll\u670d\u52a1\u5668\u540e\uff0cpoll\u670d\u52a1\u5668\u8c03\u7528\u7684poll\u51fd\u6570\u5728\u68c0\u6d4b\u5230\u76d1\u542c\u5957\u63a5\u5b57\u7684\u8bfb\u4e8b\u4ef6\u5c31\u7eea\u540e\u5c31\u4f1a\u8c03\u7528accept\u83b7\u53d6\u5efa\u7acb\u597d\u7684\u8fde\u63a5\uff0c\u5e76\u6253\u5370\u8f93\u51fa\u5ba2\u6237\u7aef\u7684IP\u548c\u7aef\u53e3\u53f7\uff0c\u6b64\u65f6\u5ba2\u6237\u7aef\u53d1\u6765\u7684\u6570\u636e\u4e5f\u80fd\u591f\u6210\u529f\u88abpoll\u670d\u52a1\u5668\u6536\u5230\u5e76\u8fdb\u884c\u6253\u5370\u8f93\u51fa\u3002<img decoding=\"async\" src=\"https:\/\/cdn.codergodv.xyz\/f20c26611c3da3f09de80cc8394b6738.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"><\/p>\n\n\n\n<p>\u6b64\u5916\uff0cpoll\u670d\u52a1\u5668\u4e5f\u662f\u4e00\u4e2a\u5355\u8fdb\u7a0b\u670d\u52a1\u5668\uff0c\u4f46\u662f\u5b83\u4e5f\u53ef\u4ee5\u540c\u65f6\u4e3a\u591a\u4e2a\u5ba2\u6237\u7aef\u63d0\u4f9b\u670d\u52a1\u3002<img decoding=\"async\" src=\"https:\/\/cdn.codergodv.xyz\/99df0be6407f2de46fdf322dfbe7f0b2.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"><\/p>\n\n\n\n<p>\u5f53\u670d\u52a1\u5668\u7aef\u68c0\u6d4b\u5230\u5ba2\u6237\u7aef\u9000\u51fa\u540e\uff0c\u4e5f\u4f1a\u5173\u95ed\u5bf9\u5e94\u7684\u8fde\u63a5\uff0c\u5e76\u5c06\u5bf9\u5e94\u7684\u5957\u63a5\u5b57\u4ecefds\u6570\u7ec4\u5f53\u4e2d\u6e05\u9664\u3002<img decoding=\"async\" src=\"https:\/\/cdn.codergodv.xyz\/9050bbf4128dd9abe895099549365e0e.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">poll\u7684\u4f18\u70b9<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>struct pollfd\u7ed3\u6784\u5f53\u4e2d\u5305\u542b\u4e86events\u548crevents\uff0c\u76f8\u5f53\u4e8e\u5c06select\u7684\u8f93\u5165\u8f93\u51fa\u578b\u53c2\u6570\u8fdb\u884c\u5206\u79bb\uff0c\u56e0\u6b64\u5728\u6bcf\u6b21\u8c03\u7528poll\u4e4b\u524d\uff0c\u4e0d\u9700\u8981\u50cfselect\u4e00\u6837\u91cd\u65b0\u5bf9\u53c2\u6570\u8fdb\u884c\u8bbe\u7f6e\u3002<\/li>\n\n\n\n<li>poll\u53ef\u76d1\u63a7\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u6570\u91cf\u6ca1\u6709\u9650\u5236\u3002<\/li>\n\n\n\n<li>\u5f53\u7136\uff0cpoll\u4e5f\u53ef\u4ee5\u540c\u65f6\u7b49\u5f85\u591a\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\uff0c\u80fd\u591f\u63d0\u9ad8IO\u7684\u6548\u7387\u3002<\/li>\n<\/ul>\n\n\n\n<p><strong>\u8bf4\u660e\u4e00\u4e0b\uff1a<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u867d\u7136\u4ee3\u7801\u4e2d\u5c06fds\u6570\u7ec4\u7684\u5143\u7d20\u4e2a\u6570\u5b9a\u4e49\u4e3a1024\uff0c\u4f46fds\u6570\u7ec4\u7684\u5927\u5c0f\u662f\u53ef\u4ee5\u7ee7\u7eed\u589e\u5927\u7684\uff0cpoll\u51fd\u6570\u80fd\u591f\u5e2e\u4f60\u76d1\u89c6\u591a\u5c11\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\u662f\u7531\u4f20\u5165poll\u51fd\u6570\u7684\u7b2c\u4e8c\u4e2a\u53c2\u6570\u51b3\u5b9a\u7684\u3002<\/li>\n\n\n\n<li>\u800cfd_set\u7c7b\u578b\u53ea\u67091024\u4e2a\u6bd4\u7279\u4f4d\uff0c\u56e0\u6b64select\u51fd\u6570\u6700\u591a\u53ea\u80fd\u76d1\u89c61024\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\u3002<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">poll\u7684\u7f3a\u70b9<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u548cselect\u51fd\u6570\u4e00\u6837\uff0c\u5f53poll\u8fd4\u56de\u540e\uff0c\u9700\u8981\u904d\u5386fds\u6570\u7ec4\u6765\u83b7\u53d6\u5c31\u7eea\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u3002<\/li>\n\n\n\n<li>\u6bcf\u6b21\u8c03\u7528poll\uff0c\u90fd\u9700\u8981\u628a\u5927\u91cf\u7684struct pollfd\u7ed3\u6784\u4ece\u7528\u6237\u6001\u62f7\u8d1d\u5230\u5185\u6838\u6001\uff0c\u8fd9\u4e2a\u5f00\u9500\u4e5f\u4f1a\u968f\u7740poll\u76d1\u89c6\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u6570\u76ee\u7684\u589e\u591a\u800c\u589e\u5927\u3002<\/li>\n\n\n\n<li>\u540c\u65f6\u6bcf\u6b21\u8c03\u7528poll\u90fd\u9700\u8981\u5728\u5185\u6838\u904d\u5386\u4f20\u9012\u8fdb\u6765\u7684\u6240\u6709fd\uff0c\u8fd9\u4e2a\u5f00\u9500\u5728fd\u5f88\u591a\u65f6\u4e5f\u5f88\u5927\u3002<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">I\/O\u591a\u8def\u8f6c\u63a5\u4e4bepoll<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">epoll\u521d\u8bc6<\/h3>\n\n\n\n<p>epoll\u4e5f\u662f\u7cfb\u7edf\u63d0\u4f9b\u7684\u4e00\u4e2a\u591a\u8def\u8f6c\u63a5\u63a5\u53e3\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>epoll\u7cfb\u7edf\u8c03\u7528\u4e5f\u53ef\u4ee5\u8ba9\u6211\u4eec\u7684\u7a0b\u5e8f\u540c\u65f6\u76d1\u89c6\u591a\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\u4e0a\u7684\u4e8b\u4ef6\u662f\u5426\u5c31\u7eea\uff0c\u4e0eselect\u548cpoll\u7684\u5b9a\u4f4d\u662f\u4e00\u6837\u7684\uff0c\u9002\u7528\u573a\u666f\u4e5f\u76f8\u540c\u3002<\/li>\n\n\n\n<li>epoll\u5728\u547d\u540d\u4e0a\u6bd4poll\u591a\u4e86\u4e00\u4e2ae\uff0c\u8fd9\u4e2ae\u53ef\u4ee5\u7406\u89e3\u6210\u662fextend\uff0cepoll\u5c31\u662f\u4e3a\u4e86\u540c\u65f6\u5904\u7406\u5927\u91cf\u6587\u4ef6\u63cf\u8ff0\u7b26\u800c\u6539\u8fdb\u7684poll\u3002<\/li>\n\n\n\n<li>epoll\u57282.5.44\u5185\u6838\u4e2d\u88ab\u5f15\u8fdb\uff0c\u5b83\u51e0\u4e4e\u5177\u5907\u4e86select\u548cpoll\u7684\u6240\u6709\u4f18\u70b9\uff0c\u88ab\u516c\u8ba4\u4e3aLinux2.6\u4e0b\u6027\u80fd\u6700\u597d\u7684\u591a\u8defI\/O\u5c31\u7eea\u901a\u77e5\u65b9\u6cd5\u3002<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">epoll\u7684\u76f8\u5173\u7cfb\u7edf\u8c03\u7528<\/h3>\n\n\n\n<p>epoll\u6709\u4e09\u4e2a\u76f8\u5173\u7684\u7cfb\u7edf\u8c03\u7528\uff0c\u5206\u522b\u662fepoll_create\u3001epoll_ctl\u548cepoll_wait\u3002<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>epoll_create\u51fd\u6570<\/p>\n<\/blockquote>\n\n\n\n<p>epoll_create\u51fd\u6570\u7528\u4e8e\u521b\u5efa\u4e00\u4e2aepoll\u6a21\u578b\uff0c\u8be5\u51fd\u6570\u7684\u51fd\u6570\u539f\u578b\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>int epoll_create(int size);<\/code><\/pre>\n\n\n\n<p>\u53c2\u6570\u8bf4\u660e\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>size\uff1a\u81ea\u4eceLinux2.6.8\u4e4b\u540e\uff0csize\u53c2\u6570\u662f\u88ab\u5ffd\u7565\u7684\uff0c\u4f46size\u7684\u503c\u5fc5\u987b\u8bbe\u7f6e\u4e3a\u5927\u4e8e0\u7684\u503c\u3002<\/li>\n<\/ul>\n\n\n\n<p>\u8fd4\u56de\u503c\u8bf4\u660e\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>epoll\u6a21\u578b\u521b\u5efa\u6210\u529f\u8fd4\u56de\u5176\u5bf9\u5e94\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\uff0c\u5426\u5219\u8fd4\u56de-1\uff0c\u540c\u65f6\u9519\u8bef\u7801\u4f1a\u88ab\u8bbe\u7f6e\u3002<\/li>\n<\/ul>\n\n\n\n<p><strong>\u6ce8\u610f\uff1a<\/strong> \u5f53\u4e0d\u518d\u4f7f\u7528\u65f6\uff0c\u5fc5\u987b\u8c03\u7528close\u51fd\u6570\u5173\u95edepoll\u6a21\u578b\u5bf9\u5e94\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\uff0c\u5f53\u6240\u6709\u5f15\u7528epoll\u5b9e\u4f8b\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u90fd\u5df2\u5173\u95ed\u65f6\uff0c\u5185\u6838\u5c06\u9500\u6bc1\u8be5\u5b9e\u4f8b\u5e76\u91ca\u653e\u76f8\u5173\u8d44\u6e90\u3002<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>epoll_ctl\u51fd\u6570<\/p>\n<\/blockquote>\n\n\n\n<p>epoll_ctl\u51fd\u6570\u7528\u4e8e\u5411\u6307\u5b9a\u7684epoll\u6a21\u578b\u4e2d\u6ce8\u518c\u4e8b\u4ef6\uff0c\u8be5\u51fd\u6570\u7684\u51fd\u6570\u539f\u578b\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>int epoll_ctl(int epfd, int op, int fd, struct epoll_event *event);<\/code><\/pre>\n\n\n\n<p>\u53c2\u6570\u8bf4\u660e\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>epfd\uff1a\u6307\u5b9a\u7684epoll\u6a21\u578b\u3002<\/li>\n\n\n\n<li>op\uff1a\u8868\u793a\u5177\u4f53\u7684\u52a8\u4f5c\uff0c\u7528\u4e09\u4e2a\u5b8f\u6765\u8868\u793a\u3002<\/li>\n\n\n\n<li>fd\uff1a\u9700\u8981\u76d1\u89c6\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u3002<\/li>\n\n\n\n<li>event\uff1a\u9700\u8981\u76d1\u89c6\u8be5\u6587\u4ef6\u63cf\u8ff0\u7b26\u4e0a\u7684\u54ea\u4e9b\u4e8b\u4ef6\u3002<\/li>\n<\/ul>\n\n\n\n<p>\u7b2c\u4e8c\u4e2a\u53c2\u6570op\u7684\u53d6\u503c\u6709\u4ee5\u4e0b\u4e09\u79cd\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>EPOLL_CTL_ADD<\/code>\uff1a\u6ce8\u518c\u65b0\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u5230\u6307\u5b9a\u7684epoll\u6a21\u578b\u4e2d\u3002<\/li>\n\n\n\n<li><code>EPOLL_CTL_MOD<\/code>\uff1a\u4fee\u6539\u5df2\u7ecf\u6ce8\u518c\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u76d1\u542c\u4e8b\u4ef6\u3002<\/li>\n\n\n\n<li><code>EPOLL_CTL_DEL<\/code>\uff1a\u4eceepoll\u6a21\u578b\u4e2d\u5220\u9664\u6307\u5b9a\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u3002<\/li>\n<\/ul>\n\n\n\n<p>\u8fd4\u56de\u503c\u8bf4\u660e\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u51fd\u6570\u8c03\u7528\u6210\u529f\u8fd4\u56de0\uff0c\u8c03\u7528\u5931\u8d25\u8fd4\u56de-1\uff0c\u540c\u65f6\u9519\u8bef\u7801\u4f1a\u88ab\u8bbe\u7f6e\u3002<\/li>\n<\/ul>\n\n\n\n<p>\u7b2c\u56db\u4e2a\u53c2\u6570\u5bf9\u5e94\u7684struct epoll_event\u7ed3\u6784\u5982\u4e0b\uff1a<img decoding=\"async\" src=\"https:\/\/cdn.codergodv.xyz\/9de58c1b28131e88ba6ab21adda03101.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"><\/p>\n\n\n\n<p>struct epoll_event\u7ed3\u6784\u4e2d\u6709\u4e24\u4e2a\u6210\u5458\uff0c\u7b2c\u4e00\u4e2a\u6210\u5458events\u8868\u793a\u7684\u662f\u9700\u8981\u76d1\u89c6\u7684\u4e8b\u4ef6\uff0c\u7b2c\u4e8c\u4e2a\u6210\u5458data\u662f\u4e00\u4e2a\u8054\u5408\u4f53\u7ed3\u6784\uff0c\u4e00\u822c\u9009\u62e9\u4f7f\u7528\u8be5\u7ed3\u6784\u5f53\u4e2d\u7684fd\uff0c\u8868\u793a\u9700\u8981\u76d1\u542c\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u3002<\/p>\n\n\n\n<p>events\u7684\u5e38\u7528\u53d6\u503c\u5982\u4e0b\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>EPOLLIN<\/code>\uff1a\u8868\u793a\u5bf9\u5e94\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u53ef\u4ee5\u8bfb\uff08\u5305\u62ec\u5bf9\u7aefSOCKET\u6b63\u5e38\u5173\u95ed\uff09\u3002<\/li>\n\n\n\n<li><code>EPOLLOUT<\/code>\uff1a\u8868\u793a\u5bf9\u5e94\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u53ef\u4ee5\u5199\u3002<\/li>\n\n\n\n<li><code>EPOLLPRI<\/code>\uff1a\u8868\u793a\u5bf9\u5e94\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u6709\u7d27\u6025\u7684\u6570\u636e\u53ef\u8bfb\uff08\u8fd9\u91cc\u5e94\u8be5\u8868\u793a\u6709\u5e26\u5916\u6570\u636e\u5230\u6765\uff09\u3002<\/li>\n\n\n\n<li><code>EPOLLERR<\/code>\uff1a\u8868\u793a\u5bf9\u5e94\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u53d1\u9001\u9519\u8bef\u3002<\/li>\n\n\n\n<li><code>EPOLLHUP<\/code>\uff1a\u8868\u793a\u5bf9\u5e94\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u88ab\u6302\u65ad\uff0c\u5373\u5bf9\u7aef\u5c06\u6587\u4ef6\u63cf\u8ff0\u7b26\u5173\u95ed\u4e86\u3002<\/li>\n\n\n\n<li><code>EPOLLET<\/code>\uff1a\u5c06epoll\u7684\u5de5\u4f5c\u65b9\u5f0f\u8bbe\u7f6e\u4e3a\u8fb9\u7f18\u89e6\u53d1\uff08Edge Triggered\uff09\u6a21\u5f0f\u3002<\/li>\n\n\n\n<li><code>EPOLLONESHOT<\/code>\uff1a\u53ea\u76d1\u542c\u4e00\u6b21\u4e8b\u4ef6\uff0c\u5f53\u76d1\u542c\u5b8c\u8fd9\u6b21\u4e8b\u4ef6\u4e4b\u540e\uff0c\u5982\u679c\u8fd8\u9700\u8981\u7ee7\u7eed\u76d1\u542c\u8be5\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u8bdd\uff0c\u9700\u8981\u91cd\u65b0\u5c06\u8be5\u6587\u4ef6\u63cf\u8ff0\u7b26\u6dfb\u52a0\u5230epoll\u6a21\u578b\u4e2d\u3002<\/li>\n<\/ul>\n\n\n\n<p>\u8fd9\u4e9b\u53d6\u503c\u5b9e\u9645\u4e5f\u662f\u4ee5\u5b8f\u7684\u65b9\u5f0f\u8fdb\u884c\u5b9a\u4e49\u7684\uff0c\u5b83\u4eec\u7684\u4e8c\u8fdb\u5236\u5e8f\u5217\u5f53\u4e2d\u6709\u4e14\u53ea\u6709\u4e00\u4e2a\u6bd4\u7279\u4f4d\u662f1\uff0c\u4e14\u4e3a1\u7684\u6bd4\u7279\u4f4d\u662f\u5404\u4e0d\u76f8\u540c\u7684\u3002<img decoding=\"async\" src=\"https:\/\/cdn.codergodv.xyz\/8f51fd2377c4bbcc0157e9a27c15afd9.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"><\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>epoll_wait\u51fd\u6570<\/p>\n<\/blockquote>\n\n\n\n<p>epoll_ctl\u51fd\u6570\u7528\u4e8e\u6536\u96c6\u76d1\u89c6\u7684\u4e8b\u4ef6\u4e2d\u5df2\u7ecf\u5c31\u7eea\u7684\u4e8b\u4ef6\uff0c\u8be5\u51fd\u6570\u7684\u51fd\u6570\u539f\u578b\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>int epoll_wait(int epfd, struct epoll_event *events, int maxevents, int timeout);<\/code><\/pre>\n\n\n\n<p>\u53c2\u6570\u8bf4\u660e\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>epfd\uff1a\u6307\u5b9a\u7684epoll\u6a21\u578b\u3002<\/li>\n\n\n\n<li>events\uff1a\u5185\u6838\u4f1a\u5c06\u5df2\u7ecf\u5c31\u7eea\u7684\u4e8b\u4ef6\u62f7\u8d1d\u5230events\u6570\u7ec4\u5f53\u4e2d\uff08events\u4e0d\u80fd\u662f\u7a7a\u6307\u9488\uff0c\u5185\u6838\u53ea\u8d1f\u8d23\u5c06\u5c31\u7eea\u4e8b\u4ef6\u62f7\u8d1d\u5230\u8be5\u6570\u7ec4\u4e2d\uff0c\u4e0d\u4f1a\u5e2e\u6211\u4eec\u5728\u7528\u6237\u6001\u4e2d\u5206\u914d\u5185\u5b58\uff09\u3002<\/li>\n\n\n\n<li>maxevents\uff1aevents\u6570\u7ec4\u4e2d\u7684\u5143\u7d20\u4e2a\u6570\uff0c\u8be5\u503c\u4e0d\u80fd\u5927\u4e8e\u521b\u5efaepoll\u6a21\u578b\u65f6\u4f20\u5165\u7684size\u503c\u3002<\/li>\n\n\n\n<li>timeout\uff1a\u8868\u793aepoll_wait\u51fd\u6570\u7684\u8d85\u65f6\u65f6\u95f4\uff0c\u5355\u4f4d\u662f\u6beb\u79d2\uff08ms\uff09\u3002<\/li>\n<\/ul>\n\n\n\n<p>\u53c2\u6570timeout\u7684\u53d6\u503c\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>-1\uff1aepoll_wait\u8c03\u7528\u540e\u8fdb\u884c\u963b\u585e\u7b49\u5f85\uff0c\u76f4\u5230\u88ab\u76d1\u89c6\u7684\u67d0\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\u4e0a\u7684\u67d0\u4e2a\u4e8b\u4ef6\u5c31\u7eea\u3002<\/li>\n\n\n\n<li>0\uff1aepoll_wait\u8c03\u7528\u540e\u8fdb\u884c\u975e\u963b\u585e\u7b49\u5f85\uff0c\u65e0\u8bba\u88ab\u76d1\u89c6\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u4e0a\u7684\u4e8b\u4ef6\u662f\u5426\u5c31\u7eea\uff0cepoll_wait\u68c0\u6d4b\u540e\u90fd\u4f1a\u7acb\u5373\u8fd4\u56de\u3002<\/li>\n\n\n\n<li>\u7279\u5b9a\u7684\u65f6\u95f4\u503c\uff1aepoll_wait\u8c03\u7528\u540e\u5728\u76f4\u5230\u7684\u65f6\u95f4\u5185\u8fdb\u884c\u963b\u585e\u7b49\u5f85\uff0c\u5982\u679c\u88ab\u76d1\u89c6\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u4e0a\u4e00\u76f4\u6ca1\u6709\u4e8b\u4ef6\u5c31\u7eea\uff0c\u5219\u5728\u8be5\u65f6\u95f4\u540eepoll_wait\u8fdb\u884c\u8d85\u65f6\u8fd4\u56de\u3002<\/li>\n<\/ul>\n\n\n\n<p>\u8fd4\u56de\u503c\u8bf4\u660e\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5982\u679c\u51fd\u6570\u8c03\u7528\u6210\u529f\uff0c\u5219\u8fd4\u56de\u6709\u4e8b\u4ef6\u5c31\u7eea\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u4e2a\u6570\u3002<\/li>\n\n\n\n<li>\u5982\u679ctimeout\u65f6\u95f4\u8017\u5c3d\uff0c\u5219\u8fd4\u56de0\u3002<\/li>\n\n\n\n<li>\u5982\u679c\u51fd\u6570\u8c03\u7528\u5931\u8d25\uff0c\u5219\u8fd4\u56de-1\uff0c\u540c\u65f6\u9519\u8bef\u7801\u4f1a\u88ab\u8bbe\u7f6e\u3002<\/li>\n<\/ul>\n\n\n\n<p>epoll_wait\u8c03\u7528\u5931\u8d25\u65f6\uff0c\u9519\u8bef\u7801\u53ef\u80fd\u88ab\u8bbe\u7f6e\u4e3a\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>EBADF<\/code>\uff1a\u4f20\u5165\u7684epoll\u6a21\u578b\u5bf9\u5e94\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u65e0\u6548\u3002<\/li>\n\n\n\n<li><code>EFAULT<\/code>\uff1aevents\u6307\u5411\u7684\u6570\u7ec4\u7a7a\u95f4\u65e0\u6cd5\u901a\u8fc7\u5199\u5165\u6743\u9650\u8bbf\u95ee\u3002<\/li>\n\n\n\n<li><code>EINTR<\/code>\uff1a\u6b64\u8c03\u7528\u88ab\u4fe1\u53f7\u6240\u4e2d\u65ad\u3002<\/li>\n\n\n\n<li><code>EINVAL<\/code>\uff1aepfd\u4e0d\u662f\u4e00\u4e2aepoll\u6a21\u578b\u5bf9\u5e94\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\uff0c\u6216\u4f20\u5165\u7684maxevents\u503c\u5c0f\u4e8e\u7b49\u4e8e0\u3002<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">epoll\u5de5\u4f5c\u539f\u7406<\/h3>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>\u7ea2\u9ed1\u6811\u548c\u5c31\u7eea\u961f\u5217<\/p>\n<\/blockquote>\n\n\n\n<figure class=\"wp-block-image\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/cdn.codergodv.xyz\/3ed4ff651580c9c5353192350c595f8a.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/cdn.codergodv.xyz\/3ed4ff651580c9c5353192350c595f8a.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/div><\/figure>\n\n\n\n<p>\u5f53\u67d0\u4e00\u8fdb\u7a0b\u8c03\u7528epoll_create\u51fd\u6570\u65f6\uff0cLinux\u5185\u6838\u4f1a\u521b\u5efa\u4e00\u4e2aeventpoll\u7ed3\u6784\u4f53\uff0c\u4e5f\u5c31\u662f\u6211\u4eec\u6240\u8bf4\u7684epoll\u6a21\u578b\uff0ceventpoll\u7ed3\u6784\u4f53\u5f53\u4e2d\u7684\u6210\u5458rbr\u548crdlist\u4e0eepoll\u7684\u4f7f\u7528\u65b9\u5f0f\u5bc6\u5207\u76f8\u5173\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>struct eventpoll{\n\n    ...\n    \/\/\u7ea2\u9ed1\u6811\u7684\u6839\u8282\u70b9\uff0c\u8fd9\u68f5\u6811\u4e2d\u5b58\u50a8\u7740\u6240\u6709\u6dfb\u52a0\u5230epoll\u4e2d\u7684\u9700\u8981\u76d1\u89c6\u7684\u4e8b\u4ef6\n    struct rb_root rbr;\n    \/\/\u5c31\u7eea\u961f\u5217\u4e2d\u5219\u5b58\u653e\u7740\u5c06\u8981\u901a\u8fc7epoll_wait\u8fd4\u56de\u7ed9\u7528\u6237\u7684\u6ee1\u8db3\u6761\u4ef6\u7684\u4e8b\u4ef6\n    struct list_head rdlist;\n    ...\n}<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li>epoll\u6a21\u578b\u5f53\u4e2d\u7684\u7ea2\u9ed1\u6811\u672c\u8d28\u5c31\u662f\u544a\u8bc9\u5185\u6838\uff0c\u9700\u8981\u76d1\u89c6\u54ea\u4e9b\u6587\u4ef6\u63cf\u8ff0\u7b26\u4e0a\u7684\u54ea\u4e9b\u4e8b\u4ef6\uff0c\u8c03\u7528epll_ctl\u51fd\u6570\u5b9e\u9645\u5c31\u662f\u5728\u5bf9\u8fd9\u9897\u7ea2\u9ed1\u6811\u8fdb\u884c\u5bf9\u5e94\u7684\u589e\u5220\u6539\u64cd\u4f5c\u3002<\/li>\n\n\n\n<li>epoll\u6a21\u578b\u5f53\u4e2d\u7684\u5c31\u7eea\u961f\u5217\u672c\u8d28\u5c31\u662f\u544a\u8bc9\u5185\u6838\uff0c\u54ea\u4e9b\u6587\u4ef6\u63cf\u8ff0\u7b26\u4e0a\u7684\u54ea\u4e9b\u4e8b\u4ef6\u5df2\u7ecf\u5c31\u7eea\u4e86\uff0c\u8c03\u7528epoll_wait\u51fd\u6570\u5b9e\u9645\u5c31\u662f\u5728\u4ece\u5c31\u7eea\u961f\u5217\u5f53\u4e2d\u83b7\u53d6\u5df2\u7ecf\u5c31\u7eea\u7684\u4e8b\u4ef6\u3002<\/li>\n<\/ul>\n\n\n\n<p>\u5728epoll\u4e2d\uff0c\u5bf9\u4e8e\u6bcf\u4e00\u4e2a\u4e8b\u4ef6\u90fd\u4f1a\u6709\u4e00\u4e2a\u5bf9\u5e94\u7684epitem\u7ed3\u6784\u4f53\uff0c\u7ea2\u9ed1\u6811\u548c\u5c31\u7eea\u961f\u5217\u5f53\u4e2d\u7684\u8282\u70b9\u5206\u522b\u662f\u57fa\u4e8eepitem\u7ed3\u6784\u4e2d\u7684rbn\u6210\u5458\u548crdllink\u6210\u5458\u7684\uff0cepitem\u7ed3\u6784\u5f53\u4e2d\u7684\u6210\u5458ffd\u8bb0\u5f55\u7684\u662f\u6307\u5b9a\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u503c\uff0cevent\u6210\u5458\u8bb0\u5f55\u7684\u5c31\u662f\u8be5\u6587\u4ef6\u63cf\u8ff0\u7b26\u5bf9\u5e94\u7684\u4e8b\u4ef6\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>struct epitem{\n\n    struct rb_node rbn; \/\/\u7ea2\u9ed1\u6811\u8282\u70b9\n    struct list_head rdllink; \/\/\u53cc\u5411\u94fe\u8868\u8282\u70b9\n    struct epoll_filefd ffd; \/\/\u4e8b\u4ef6\u53e5\u67c4\u4fe1\u606f\n    struct eventpoll *ep; \/\/\u6307\u5411\u5176\u6240\u5c5e\u7684eventpoll\u5bf9\u8c61\n    struct epoll_event event; \/\/\u671f\u5f85\u53d1\u751f\u7684\u4e8b\u4ef6\u7c7b\u578b\n}<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5bf9\u4e8eepitem\u7ed3\u6784\u5f53\u4e2drbn\u6210\u5458\u6765\u8bf4\uff0cffd\u4e0eevent\u7684\u542b\u4e49\u662f\uff0c\u9700\u8981\u76d1\u89c6ffd\u4e0a\u7684event\u4e8b\u4ef6\u662f\u5426\u5c31\u7eea\u3002<\/li>\n\n\n\n<li>\u5bf9\u4e8eepitem\u7ed3\u6784\u5f53\u4e2d\u7684rdlink\u6210\u5458\u6765\u8bf4\uff0cffd\u4e0eevent\u7684\u542b\u4e49\u662f\uff0cffd\u4e0a\u7684event\u4e8b\u4ef6\u5df2\u7ecf\u5c31\u7eea\u4e86\u3002<\/li>\n<\/ul>\n\n\n\n<p><strong>\u8bf4\u660e\u4e00\u4e0b\uff1a<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u7ea2\u9ed1\u6811\u662f\u4e00\u79cd\u4e8c\u53c9\u641c\u7d22\u6811\uff0c\u56e0\u6b64\u5fc5\u987b\u6709\u952e\u503ckey\uff0c\u800c\u8fd9\u91cc\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u5c31\u5929\u7136\u7684\u53ef\u4ee5\u4f5c\u4e3a\u7ea2\u9ed1\u6811\u7684key\u503c\u3002<\/li>\n\n\n\n<li>\u8c03\u7528epoll_ctl\u5411\u7ea2\u9ed1\u6811\u5f53\u4e2d\u65b0\u589e\u8282\u70b9\u65f6\uff0c\u5982\u679c\u8bbe\u7f6e\u4e86<code>EPOLLONESHOT<\/code>\u9009\u9879\uff0c\u5f53\u76d1\u542c\u5b8c\u8fd9\u6b21\u4e8b\u4ef6\u540e\uff0c\u5982\u679c\u8fd8\u9700\u8981\u7ee7\u7eed\u76d1\u542c\u8be5\u6587\u4ef6\u63cf\u8ff0\u7b26\u5219\u9700\u8981\u91cd\u65b0\u5c06\u5176\u6dfb\u52a0\u5230epoll\u6a21\u578b\u4e2d\uff0c\u672c\u8d28\u5c31\u662f\u5f53\u8bbe\u7f6e\u4e86<code>EPOLLONESHOT<\/code>\u9009\u9879\u7684\u4e8b\u4ef6\u5c31\u7eea\u65f6\uff0c\u64cd\u4f5c\u7cfb\u7edf\u4f1a\u81ea\u52a8\u5c06\u5176\u4ece\u7ea2\u9ed1\u6811\u5f53\u4e2d\u5220\u9664\u3002<\/li>\n\n\n\n<li>\u800c\u5982\u679c\u8c03\u7528epoll_ctl\u5411\u7ea2\u9ed1\u6811\u5f53\u4e2d\u65b0\u589e\u8282\u70b9\u65f6\u6ca1\u6709\u8bbe\u7f6e<code>EPOLLONESHOT<\/code>\uff0c\u90a3\u4e48\u8be5\u8282\u70b9\u63d2\u5165\u7ea2\u9ed1\u6811\u540e\u5c31\u4f1a\u4e00\u76f4\u5b58\u5728\uff0c\u9664\u975e\u7528\u6237\u8c03\u7528epoll_ctl\u5c06\u8be5\u8282\u70b9\u4ece\u7ea2\u9ed1\u6811\u5f53\u4e2d\u5220\u9664\u3002<\/li>\n<\/ul>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>\u56de\u8c03\u673a\u5236<\/p>\n<\/blockquote>\n\n\n\n<p>\u6240\u6709\u6dfb\u52a0\u5230\u7ea2\u9ed1\u6811\u5f53\u4e2d\u7684\u4e8b\u4ef6\uff0c\u90fd\u4f1a\u4e0e\u8bbe\u5907\uff08\u7f51\u5361\uff09\u9a71\u52a8\u7a0b\u5e8f\u5efa\u7acb\u56de\u8c03\u65b9\u6cd5\uff0c\u8fd9\u4e2a\u56de\u8c03\u65b9\u6cd5\u5728\u5185\u6838\u4e2d\u53ebep_poll_callback\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5bf9\u4e8eselect\u548cpoll\u6765\u8bf4\uff0c\u64cd\u4f5c\u7cfb\u7edf\u5728\u76d1\u89c6\u591a\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\u4e0a\u7684\u4e8b\u4ef6\u662f\u5426\u5c31\u7eea\u65f6\uff0c\u9700\u8981\u8ba9\u64cd\u4f5c\u7cfb\u7edf\u4e3b\u52a8\u5bf9\u8fd9\u591a\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\u8fdb\u884c\u8f6e\u8be2\u68c0\u6d4b\uff0c\u8fd9\u4e00\u5b9a\u4f1a\u589e\u52a0\u64cd\u4f5c\u7cfb\u7edf\u7684\u8d1f\u62c5\u3002<\/li>\n\n\n\n<li>\u800c\u5bf9\u4e8eepoll\u6765\u8bf4\uff0c\u64cd\u4f5c\u7cfb\u7edf\u4e0d\u9700\u8981\u4e3b\u52a8\u8fdb\u884c\u4e8b\u4ef6\u7684\u68c0\u6d4b\uff0c\u5f53\u7ea2\u9ed1\u6811\u4e2d\u76d1\u89c6\u7684\u4e8b\u4ef6\u5c31\u7eea\u65f6\uff0c\u4f1a\u81ea\u52a8\u8c03\u7528\u5bf9\u5e94\u7684\u56de\u8c03\u65b9\u6cd5\uff0c\u5c06\u5c31\u7eea\u7684\u4e8b\u4ef6\u6dfb\u52a0\u5230\u5c31\u7eea\u961f\u5217\u5f53\u4e2d\u3002<\/li>\n\n\n\n<li>\u5f53\u7528\u6237\u8c03\u7528epoll_wait\u51fd\u6570\u83b7\u53d6\u5c31\u7eea\u4e8b\u4ef6\u65f6\uff0c\u53ea\u9700\u8981\u5df2\u5173\u6ce8\u5e95\u5c42\u5c31\u7eea\u961f\u5217\u662f\u5426\u4e3a\u7a7a\uff0c\u5982\u679c\u4e0d\u4e3a\u7a7a\u5219\u5c06\u5c31\u7eea\u961f\u5217\u5f53\u4e2d\u7684\u5c31\u7eea\u4e8b\u4ef6\u62f7\u8d1d\u7ed9\u7528\u6237\u5373\u53ef\u3002<\/li>\n<\/ul>\n\n\n\n<p>\u91c7\u7528\u56de\u8c03\u673a\u5236\u6700\u5927\u7684\u597d\u5904\uff0c\u5c31\u662f\u4e0d\u518d\u9700\u8981\u64cd\u4f5c\u7cfb\u7edf\u4e3b\u52a8\u5bf9\u5c31\u7eea\u4e8b\u4ef6\u8fdb\u884c\u68c0\u6d4b\u4e86\uff0c\u5f53\u4e8b\u4ef6\u5c31\u7eea\u65f6\u4f1a\u81ea\u52a8\u8c03\u7528\u5bf9\u5e94\u7684\u56de\u8c03\u51fd\u6570\u8fdb\u884c\u5904\u7406\u3002<\/p>\n\n\n\n<p><strong>\u8bf4\u660e\u4e00\u4e0b\uff1a<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u53ea\u6709\u6dfb\u52a0\u5230\u7ea2\u9ed1\u6811\u5f53\u4e2d\u7684\u4e8b\u4ef6\u624d\u4f1a\u4e0e\u5e95\u5c42\u5efa\u7acb\u56de\u8c03\u65b9\u6cd5\uff0c\u56e0\u6b64\u53ea\u6709\u5f53\u7ea2\u9ed1\u6811\u5f53\u4e2d\u5bf9\u5e94\u7684\u4e8b\u4ef6\u5c31\u7eea\u65f6\uff0c\u624d\u4f1a\u6267\u884c\u5bf9\u5e94\u7684\u56de\u8c03\u65b9\u6cd5\u5c06\u5176\u6dfb\u52a0\u5230\u5c31\u7eea\u961f\u5217\u5f53\u4e2d\u3002<\/li>\n\n\n\n<li>\u5f53\u4e0d\u65ad\u6709\u76d1\u89c6\u7684\u4e8b\u4ef6\u5c31\u7eea\u65f6\uff0c\u4f1a\u4e0d\u65ad\u8c03\u7528\u56de\u8c03\u65b9\u6cd5\u5411\u5c31\u7eea\u961f\u5217\u5f53\u4e2d\u63d2\u5165\u8282\u70b9\uff0c\u800c\u4e0a\u5c42\u4e5f\u4f1a\u4e0d\u65ad\u8c03\u7528epoll_wait\u51fd\u6570\u4ece\u5c31\u7eea\u961f\u5217\u5f53\u4e2d\u83b7\u53d6\u8282\u70b9\uff0c\u8fd9\u662f\u5178\u578b\u7684\u751f\u4ea7\u8005\u6d88\u8d39\u8005\u6a21\u578b\u3002<\/li>\n\n\n\n<li>\u7531\u4e8e\u5c31\u7eea\u961f\u5217\u53ef\u80fd\u4f1a\u88ab\u591a\u4e2a\u6267\u884c\u6d41\u540c\u65f6\u8bbf\u95ee\uff0c\u56e0\u6b64\u5fc5\u987b\u8981\u4f7f\u7528\u4e92\u65a5\u9501\u5bf9\u5176\u8fdb\u884c\u4fdd\u62a4\uff0ceventpoll\u7ed3\u6784\u5f53\u4e2d\u7684lock\u548cmtx\u5c31\u662f\u7528\u4e8e\u4fdd\u62a4\u4e34\u754c\u8d44\u6e90\u7684\uff0c\u56e0\u6b64epoll\u672c\u8eab\u662f\u7ebf\u7a0b\u5b89\u5168\u7684\u3002<\/li>\n\n\n\n<li>eventpoll\u7ed3\u6784\u5f53\u4e2d\u7684wq\uff08wait queue\uff09\u5c31\u662f\u7b49\u5f85\u961f\u5217\uff0c\u5f53\u591a\u4e2a\u6267\u884c\u6d41\u60f3\u8981\u540c\u65f6\u8bbf\u95ee\u540c\u4e00\u4e2aepoll\u6a21\u578b\u65f6\uff0c\u5c31\u9700\u8981\u5728\u8be5\u7b49\u5f85\u961f\u5217\u4e0b\u8fdb\u884c\u7b49\u5f85\u3002<\/li>\n<\/ul>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>epoll\u4e09\u90e8\u66f2<\/p>\n<\/blockquote>\n\n\n\n<p>\u603b\u7ed3\u4e00\u4e0b\uff0cepoll\u7684\u4f7f\u7528\u8fc7\u7a0b\u5c31\u662f\u4e09\u90e8\u66f2\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u8c03\u7528epoll_create\u521b\u5efa\u4e00\u4e2aepoll\u6a21\u578b\u3002<\/li>\n\n\n\n<li>\u8c03\u7528epoll_ctl\uff0c\u5c06\u8981\u76d1\u63a7\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u8fdb\u884c\u6ce8\u518c\u3002<\/li>\n\n\n\n<li>\u8c03\u7528epoll_wait\uff0c\u7b49\u5f85\u6587\u4ef6\u63cf\u8ff0\u7b26\u5c31\u7eea\u3002<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">epoll\u670d\u52a1\u5668<\/h3>\n\n\n\n<p>\u4e3a\u4e86\u7b80\u5355\u6f14\u793a\u4e00\u4e0bepoll\u7684\u4f7f\u7528\u65b9\u5f0f\uff0c\u8fd9\u91cc\u6211\u4eec\u4e5f\u5b9e\u73b0\u4e00\u4e2a\u7b80\u5355\u7684epoll\u670d\u52a1\u5668\uff0c\u8be5\u670d\u52a1\u5668\u4e5f\u53ea\u662f\u8bfb\u53d6\u5ba2\u6237\u7aef\u53d1\u6765\u7684\u6570\u636e\u5e76\u8fdb\u884c\u6253\u5370\u3002<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>EpollServer\u7c7b<\/p>\n<\/blockquote>\n\n\n\n<p>EpollServer\u7c7b\u5f53\u4e2d\u9664\u4e86\u9700\u8981\u5305\u542b\u76d1\u542c\u5957\u63a5\u5b57\u548c\u7aef\u53e3\u53f7\u4e24\u4e2a\u6210\u5458\u53d8\u91cf\u4e4b\u5916\uff0c\u6700\u597d\u5c06epoll\u6a21\u578b\u5bf9\u5e94\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u4e5f\u4f5c\u4e3a\u4e00\u4e2a\u6210\u5458\u53d8\u91cf\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5728\u6784\u9020EpollServer\u5bf9\u8c61\u65f6\uff0c\u9700\u8981\u6307\u660eepoll\u670d\u52a1\u5668\u7684\u7aef\u53e3\u53f7\uff0c\u5f53\u7136\u4e5f\u53ef\u4ee5\u5728\u521d\u59cb\u5316epoll\u670d\u52a1\u5668\u7684\u65f6\u5019\u6307\u660e\u3002<\/li>\n\n\n\n<li>\u5728\u521d\u59cb\u5316epoll\u670d\u52a1\u5668\u7684\u65f6\u5019\u8c03\u7528Socket\u7c7b\u5f53\u4e2d\u7684\u51fd\u6570\uff0c\u4f9d\u6b21\u8fdb\u884c\u5957\u63a5\u5b57\u7684\u521b\u5efa\u3001\u7ed1\u5b9a\u548c\u76d1\u542c\uff0c\u6b64\u5916epoll\u6a21\u578b\u7684\u521b\u5efa\u53ef\u4ee5\u5728\u670d\u52a1\u5668\u521d\u59cb\u5316\u7684\u65f6\u5019\u8fdb\u884c\u3002<\/li>\n\n\n\n<li>\u5728\u6790\u6784\u51fd\u6570\u4e2d\u8c03\u7528close\u51fd\u6570\uff0c\u5c06\u76d1\u542c\u5957\u63a5\u5b57\u548cepoll\u6a21\u578b\u5bf9\u5e94\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u8fdb\u884c\u5173\u95ed\u3002<\/li>\n<\/ul>\n\n\n\n<p>\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>#include \"socket.hpp\"\n#include &lt;sys\/epoll.h&gt;\n\n#define BACK_LOG 5\n#define SIZE 256\n\nclass EpollServer{\n\nprivate:\n    int _listen_sock; \/\/\u76d1\u542c\u5957\u63a5\u5b57\n    int _port; \/\/\u7aef\u53e3\u53f7\n    int _epfd; \/\/epoll\u6a21\u578b\npublic:\n    EpollServer(int port)\n        : _port(port)\n    {\n            }\n    void InitEpollServer()\n    {\n\n        _listen_sock = Socket::SocketCreate();\n        Socket::SocketBind(_listen_sock, _port);\n        Socket::SocketListen(_listen_sock, BACK_LOG);\n\n        \/\/\u521b\u5efaepoll\u6a21\u578b\n        _epfd = epoll_create(SIZE);\n        if (_epfd &lt; 0){\n\n            std::cerr &lt;&lt; \"epoll_create error\" &lt;&lt; std::endl;\n            exit(5);\n        }\n    }\n    ~EpollServer()\n    {\n\n        if (_listen_sock &gt;= 0){\n\n            close(_listen_sock);\n        }\n        if (_epfd &gt;= 0){\n\n            close(_epfd);\n        }\n    }\n};<\/code><\/pre>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>\u8fd0\u884c\u670d\u52a1\u5668<\/p>\n<\/blockquote>\n\n\n\n<p>\u670d\u52a1\u5668\u521d\u59cb\u5316\u5b8c\u6bd5\u540e\u5c31\u53ef\u4ee5\u5f00\u59cb\u8fd0\u884c\u4e86\uff0c\u800cepoll\u670d\u52a1\u5668\u8981\u505a\u7684\u5c31\u662f\u4e0d\u65ad\u8c03\u7528epoll_wait\u51fd\u6570\uff0c\u4ece\u5c31\u7eea\u961f\u5217\u5f53\u4e2d\u83b7\u53d6\u5c31\u7eea\u4e8b\u4ef6\u8fdb\u884c\u5904\u7406\u5373\u53ef\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u9996\u5148\uff0c\u5728epoll\u670d\u52a1\u5668\u5f00\u59cb\u6b7b\u5faa\u73af\u8c03\u7528epoll_wait\u51fd\u6570\u4e4b\u524d\uff0c\u9700\u8981\u5148\u8c03\u7528epoll_ctl\u5c06\u76d1\u542c\u5957\u63a5\u5b57\u6dfb\u52a0\u5230epoll\u6a21\u578b\u5f53\u4e2d\uff0c\u8868\u793a\u670d\u52a1\u5668\u521a\u5f00\u59cb\u8fd0\u884c\u65f6\u53ea\u9700\u8981\u76d1\u89c6\u76d1\u542c\u5957\u63a5\u5b57\u7684\u8bfb\u4e8b\u4ef6\u3002<\/li>\n\n\n\n<li>\u6b64\u540e\uff0cepoll\u670d\u52a1\u5668\u5c31\u4e0d\u65ad\u8c03\u7528epoll_wait\u51fd\u6570\u76d1\u89c6\u8bfb\u4e8b\u4ef6\u662f\u5426\u5c31\u7eea\u3002\u5982\u679cepoll_wait\u51fd\u6570\u7684\u8fd4\u56de\u503c\u5927\u4e8e0\uff0c\u5219\u8bf4\u660e\u5df2\u7ecf\u6709\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u8bfb\u4e8b\u4ef6\u5c31\u7eea\uff0c\u5e76\u4e14\u6b64\u65f6\u7684\u8fd4\u56de\u503c\u4ee3\u8868\u7684\u5c31\u662f\u6709\u4e8b\u4ef6\u5c31\u7eea\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u4e2a\u6570\uff0c\u63a5\u4e0b\u6765\u5c31\u5e94\u8be5\u5bf9\u5c31\u7eea\u4e8b\u4ef6\u8fdb\u884c\u5904\u7406\u3002<\/li>\n\n\n\n<li>\u5982\u679cepoll_wait\u51fd\u6570\u7684\u8fd4\u56de\u503c\u7b49\u4e8e0\uff0c\u5219\u8bf4\u660etimeout\u65f6\u95f4\u8017\u5c3d\uff0c\u6b64\u65f6\u76f4\u63a5\u51c6\u5907\u8fdb\u884c\u4e0b\u4e00\u6b21epoll_wait\u8c03\u7528\u5373\u53ef\u3002\u5982\u679cepoll_wait\u51fd\u6570\u7684\u8fd4\u56de\u503c\u4e3a-1\uff0c\u6b64\u65f6\u4e5f\u8ba9\u670d\u52a1\u5668\u51c6\u5907\u8fdb\u884c\u4e0b\u4e00\u6b21epoll_wait\u8c03\u7528\uff0c\u4f46\u5b9e\u9645\u5e94\u8be5\u8fdb\u4e00\u6b65\u5224\u65ad\u9519\u8bef\u7801\uff0c\u6839\u636e\u9519\u8bef\u7801\u6765\u5224\u65ad\u662f\u5426\u5e94\u8be5\u7ee7\u7eed\u8c03\u7528epoll_wait\u51fd\u6570\u3002<\/li>\n<\/ul>\n\n\n\n<p>\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>#include \"socket.hpp\"\n#include &lt;sys\/epoll.h&gt;\n\n#define BACK_LOG 5\n#define SIZE 256\n#define MAX_NUM 64\n\nclass EpollServer{\n\nprivate:\n    int _listen_sock; \/\/\u76d1\u542c\u5957\u63a5\u5b57\n    int _port; \/\/\u7aef\u53e3\u53f7\n    int _epfd; \/\/epoll\u6a21\u578b\npublic:\n    void Run()\n    {\n\n        AddEvent(_listen_sock, EPOLLIN); \/\/\u5c06\u76d1\u542c\u5957\u63a5\u5b57\u6dfb\u52a0\u5230epoll\u6a21\u578b\u4e2d\uff0c\u5e76\u5173\u5fc3\u5176\u8bfb\u4e8b\u4ef6\n        for (;;){\n\n            struct epoll_event revs&#91;MAX_NUM];\n            int num = epoll_wait(_epfd, revs, MAX_NUM, -1);\n            if (num &lt; 0){\n\n                std::cerr &lt;&lt; \"epoll_wait error\" &lt;&lt; std::endl;\n                continue;\n            }\n            else if (num == 0){\n\n                std::cout &lt;&lt; \"timeout...\" &lt;&lt; std::endl;\n                continue;\n            }\n            else{\n\n                \/\/\u6b63\u5e38\u7684\u4e8b\u4ef6\u5904\u7406\n                \/\/std::cout&lt;&lt;\"\u6709\u4e8b\u4ef6\u53d1\u751f...\"&lt;&lt;std::endl;\n                HandlerEvent(revs, num);\n            }\n        }\n    }\nprivate:\n    void AddEvent(int sock, uint32_t event)\n    {\n\n        struct epoll_event ev;\n        ev.events = event;\n        ev.data.fd = sock;\n\n        epoll_ctl(_epfd, EPOLL_CTL_ADD, sock, &amp;ev);\n    }\n};<\/code><\/pre>\n\n\n\n<p><strong>\u8bf4\u660e\u4e00\u4e0b\uff1a<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0c\u53ea\u8981\u5e95\u5c42\u6709\u5c31\u7eea\u4e8b\u4ef6\u6ca1\u6709\u5904\u7406\uff0cepoll\u4e5f\u4f1a\u4e00\u76f4\u901a\u77e5\u7528\u6237\uff0c\u4e5f\u5c31\u662f\u8c03\u7528epoll_wait\u4f1a\u4e00\u76f4\u6210\u529f\u8fd4\u56de\uff0c\u5e76\u5c06\u5c31\u7eea\u7684\u4e8b\u4ef6\u62f7\u8d1d\u5230\u6211\u4eec\u4f20\u5165\u7684\u6570\u7ec4\u5f53\u4e2d\u3002<\/li>\n\n\n\n<li>\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u6240\u8c13\u7684\u4e8b\u4ef6\u5904\u7406\u5e76\u4e0d\u662f\u8c03\u7528epoll_wait\u5c06\u5e95\u5c42\u5c31\u7eea\u961f\u5217\u4e2d\u7684\u5c31\u7eea\u4e8b\u4ef6\u62f7\u8d1d\u5230\u7528\u6237\u5c42\uff0c\u6bd4\u5982\u5f53\u8fd9\u91cc\u7684\u8bfb\u4e8b\u4ef6\u5c31\u7eea\u540e\uff0c\u6211\u4eec\u5e94\u8be5\u8c03\u7528accept\u83b7\u53d6\u5e95\u5c42\u5efa\u7acb\u597d\u7684\u8fde\u63a5\uff0c\u6216\u8c03\u7528recv\u8bfb\u53d6\u5ba2\u6237\u7aef\u53d1\u6765\u7684\u6570\u636e\uff0c\u8fd9\u624d\u7b97\u662f\u5c06\u8bfb\u4e8b\u4ef6\u5904\u7406\u4e86\u3002<\/li>\n\n\n\n<li>\u5982\u679c\u6211\u4eec\u4ec5\u4ec5\u662f\u8c03\u7528epoll_wait\u5c06\u5e95\u5c42\u5c31\u7eea\u961f\u5217\u5f53\u4e2d\u7684\u4e8b\u4ef6\u62f7\u8d1d\u5230\u5e94\u7528\u5c42\uff0c\u90a3\u4e48\u8fd9\u4e9b\u5c31\u7eea\u4e8b\u4ef6\u5b9e\u9645\u5e76\u6ca1\u6709\u88ab\u5904\u7406\u6389\uff0c\u5e95\u5c42\u6ce8\u518c\u7684\u56de\u8c03\u51fd\u6570\u4f1a\u88ab\u518d\u6b21\u8c03\u7528\uff0c\u5c06\u5c31\u7eea\u7684\u4e8b\u4ef6\u91cd\u65b0\u6dfb\u52a0\u5230\u5c31\u7eea\u961f\u5217\u5f53\u4e2d\uff0c\u672c\u8d28\u539f\u56e0\u5c31\u662f\u6211\u4eec\u5b9e\u9645\u5e76\u6ca1\u6709\u5bf9\u5e95\u5c42\u5c31\u7eea\u7684\u6570\u636e\u8fdb\u884c\u8bfb\u53d6\u3002<\/li>\n<\/ul>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>\u4e8b\u4ef6\u5904\u7406<\/p>\n<\/blockquote>\n\n\n\n<p>\u5982\u679c\u5e95\u5c42\u5c31\u7eea\u961f\u5217\u5f53\u4e2d\u6709\u5c31\u7eea\u4e8b\u4ef6\uff0c\u90a3\u4e48\u8c03\u7528epoll_wait\u51fd\u6570\u65f6\u5c31\u4f1a\u5c06\u5e95\u5c42\u5c31\u7eea\u961f\u5217\u4e2d\u7684\u4e8b\u4ef6\u62f7\u8d1d\u5230\u7528\u6237\u63d0\u4f9b\u7684revs\u6570\u7ec4\u5f53\u4e2d\uff0c\u63a5\u4e0b\u6765epoll\u670d\u52a1\u5668\u5c31\u5e94\u8be5\u5bf9\u5c31\u7eea\u4e8b\u4ef6\u8fdb\u884c\u5904\u7406\u4e86\uff0c\u4e8b\u4ef6\u5904\u7406\u8fc7\u7a0b\u5982\u4e0b\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u6839\u636e\u8c03\u7528epoll_wait\u65f6\u5f97\u5230\u7684\u8fd4\u56de\u503c\uff0c\u6765\u5224\u65ad\u64cd\u4f5c\u7cfb\u7edf\u5411revs\u6570\u7ec4\u4e2d\u62f7\u8d1d\u4e86\u591a\u5c11\u4e2astruct epoll_event\u7ed3\u6784\uff0c\u8fdb\u800c\u5bf9\u8fd9\u4e9b\u6587\u4ef6\u63cf\u8ff0\u7b26\u4e0a\u7684\u4e8b\u4ef6\u8fdb\u884c\u5904\u7406\u3002<\/li>\n\n\n\n<li>\u5bf9\u4e8e\u6bcf\u4e00\u4e2a\u62f7\u8d1d\u4e0a\u6765\u7684struct epoll_event\u7ed3\u6784\uff0c\u5982\u679c\u8be5\u7ed3\u6784\u5f53\u4e2d\u7684events\u5f53\u4e2d\u5305\u542b\u8bfb\u4e8b\u4ef6\uff0c\u5219\u8bf4\u660e\u8be5\u6587\u4ef6\u63cf\u8ff0\u7b26\u5bf9\u5e94\u7684\u8bfb\u4e8b\u4ef6\u5c31\u7eea\uff0c\u4f46\u63a5\u4e0b\u6765\u8fd8\u9700\u8981\u8fdb\u4e00\u6b65\u5224\u65ad\u8be5\u6587\u4ef6\u63cf\u8ff0\u7b26\u662f\u76d1\u542c\u5957\u63a5\u5b57\u8fd8\u662f\u4e0e\u5ba2\u6237\u7aef\u5efa\u7acb\u7684\u5957\u63a5\u5b57\u3002<\/li>\n\n\n\n<li>\u5982\u679c\u662f\u76d1\u542c\u5957\u63a5\u5b57\u7684\u8bfb\u4e8b\u4ef6\u5c31\u7eea\uff0c\u5219\u8c03\u7528accept\u51fd\u6570\u5c06\u5e95\u5c42\u5efa\u7acb\u597d\u7684\u8fde\u63a5\u83b7\u53d6\u4e0a\u6765\uff0c\u5e76\u8c03\u7528epoll_ctl\u51fd\u6570\u5c06\u83b7\u53d6\u5230\u7684\u5957\u63a5\u5b57\u6dfb\u52a0\u5230epoll\u6a21\u578b\u5f53\u4e2d\uff0c\u8868\u793a\u4e0b\u4e00\u6b21\u8c03\u7528epoll_wait\u51fd\u6570\u65f6\u9700\u8981\u76d1\u89c6\u8be5\u5957\u63a5\u5b57\u7684\u8bfb\u4e8b\u4ef6\u3002<\/li>\n\n\n\n<li>\u5982\u679c\u662f\u4e0e\u5ba2\u6237\u7aef\u5efa\u7acb\u7684\u8fde\u63a5\u5bf9\u5e94\u7684\u8bfb\u4e8b\u4ef6\u5c31\u7eea\uff0c\u5219\u8c03\u7528recv\u51fd\u6570\u8bfb\u53d6\u5ba2\u6237\u7aef\u53d1\u6765\u7684\u6570\u636e\uff0c\u5e76\u5c06\u8bfb\u53d6\u5230\u7684\u6570\u636e\u5728\u670d\u52a1\u5668\u7aef\u8fdb\u884c\u6253\u5370\u3002<\/li>\n\n\n\n<li>\u5982\u679c\u5728\u8c03\u7528recv\u51fd\u6570\u65f6\u53d1\u73b0\u5ba2\u6237\u7aef\u5c06\u8fde\u63a5\u5173\u95ed\u6216recv\u51fd\u6570\u8c03\u7528\u5931\u8d25\uff0c\u5219epoll\u670d\u52a1\u5668\u4e5f\u76f4\u63a5\u5173\u95ed\u5bf9\u5e94\u7684\u8fde\u63a5\uff0c\u5e76\u8c03\u7528epoll_ctl\u51fd\u6570\u5c06\u8be5\u8fde\u63a5\u5bf9\u5e94\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u4eceepoll\u6a21\u578b\u4e2d\u5220\u9664\uff0c\u8868\u793a\u4e0b\u4e00\u6b21\u8c03\u7528epoll_wait\u51fd\u6570\u65f6\u65e0\u9700\u518d\u76d1\u89c6\u8be5\u5957\u63a5\u5b57\u7684\u8bfb\u4e8b\u4ef6\u3002<\/li>\n<\/ul>\n\n\n\n<p>\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>#include \"socket.hpp\"\n#include &lt;sys\/epoll.h&gt;\n\n#define BACK_LOG 5\n#define SIZE 256\n#define MAX_NUM 64\n\nclass EpollServer{\n\nprivate:\n    int _listen_sock; \/\/\u76d1\u542c\u5957\u63a5\u5b57\n    int _port; \/\/\u7aef\u53e3\u53f7\n    int _epfd; \/\/epoll\u6a21\u578b\npublic:\n    void HandlerEvent(struct epoll_event revs&#91;], int num)\n    {\n\n        for (int i = 0; i &lt; num; i++){\n\n            int fd = revs&#91;i].data.fd; \/\/\u5c31\u7eea\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\n            if (fd == _listen_sock&amp;&amp;revs&#91;i].events&amp;EPOLLIN){\n             \/\/\u8fde\u63a5\u4e8b\u4ef6\u5c31\u7eea\n                struct sockaddr_in peer;\n                memset(&amp;peer, 0, sizeof(peer));\n                socklen_t len = sizeof(peer);\n                int sock = accept(_listen_sock, (struct sockaddr*)&amp;peer, &amp;len);\n                if (sock &lt; 0){\n             \/\/\u83b7\u53d6\u8fde\u63a5\u5931\u8d25\n                    std::cerr &lt;&lt; \"accept error\" &lt;&lt; std::endl;\n                    continue;\n                }\n                std::string peer_ip = inet_ntoa(peer.sin_addr);\n                int peer_port = ntohs(peer.sin_port);\n                std::cout &lt;&lt; \"get a new link&#91;\" &lt;&lt; peer_ip &lt;&lt; \":\" &lt;&lt; peer_port &lt;&lt; \"]\" &lt;&lt; std::endl;\n\n                AddEvent(sock, EPOLLIN); \/\/\u5c06\u83b7\u53d6\u5230\u7684\u5957\u63a5\u5b57\u6dfb\u52a0\u5230epoll\u6a21\u578b\u4e2d\uff0c\u5e76\u5173\u5fc3\u5176\u8bfb\u4e8b\u4ef6\n            }\n            else if (revs&#91;i].events&amp;EPOLLIN){\n             \/\/\u8bfb\u4e8b\u4ef6\u5c31\u7eea\n                char buffer&#91;64];\n                ssize_t size = recv(fd, buffer, sizeof(buffer)-1, 0);\n                if (size &gt; 0){\n             \/\/\u8bfb\u53d6\u6210\u529f\n                    buffer&#91;size] = '\\0';\n                    std::cout &lt;&lt; \"echo# \" &lt;&lt; buffer &lt;&lt; std::endl;\n                }\n                else if (size == 0){\n             \/\/\u5bf9\u7aef\u8fde\u63a5\u5173\u95ed\n                    std::cout &lt;&lt; \"client quit\" &lt;&lt; std::endl;\n                    close(fd);\n                    DelEvent(fd); \/\/\u5c06\u6587\u4ef6\u63cf\u8ff0\u7b26\u4eceepoll\u6a21\u578b\u4e2d\u5220\u9664\n                }\n                else{\n\n                    std::cerr &lt;&lt; \"recv error\" &lt;&lt; std::endl;\n                    close(fd);\n                    DelEvent(fd); \/\/\u5c06\u6587\u4ef6\u63cf\u8ff0\u7b26\u4eceepoll\u6a21\u578b\u4e2d\u5220\u9664\n                }\n            }\n        }\n    }\nprivate:\n    void AddEvent(int sock, uint32_t event)\n    {\n\n        struct epoll_event ev;\n        ev.events = event;\n        ev.data.fd = sock;\n\n        epoll_ctl(_epfd, EPOLL_CTL_ADD, sock, &amp;ev);\n    }\n    void DelEvent(int sock)\n    {\n\n        epoll_ctl(_epfd, EPOLL_CTL_DEL, sock, nullptr);\n    }\n};<\/code><\/pre>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>epoll\u670d\u52a1\u5668\u6d4b\u8bd5<\/p>\n<\/blockquote>\n\n\n\n<p>\u8fd0\u884cepoll\u670d\u52a1\u5668\u65f6\u9700\u8981\u5148\u5b9e\u4f8b\u5316\u51fa\u4e00\u4e2aEpollServer\u5bf9\u8c61\uff0c\u5bf9epoll\u670d\u52a1\u5668\u8fdb\u884c\u521d\u59cb\u5316\u540e\u5c31\u53ef\u4ee5\u8fd0\u884c\u670d\u52a1\u5668\u4e86\u3002<\/p>\n\n\n\n<p>\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>#include \"epoll_server.hpp\"\n#include &lt;string&gt;\n\nstatic void Usage(std::string proc)\n{\n\n    std::cout &lt;&lt; \"Usage: \" &lt;&lt; proc &lt;&lt; \" port\" &lt;&lt; std::endl;\n}\nint main(int argc, char* argv&#91;])\n{\n\n    if (argc != 2){\n\n        Usage(argv&#91;0]);\n        exit(1);\n    }\n    int port = atoi(argv&#91;1]);\n\n    EpollServer* svr = new EpollServer(port);\n    svr-&gt;InitEpollServer();\n    svr-&gt;Run();\n\n    return 0;\n}<\/code><\/pre>\n\n\n\n<p>\u56e0\u4e3a\u7f16\u5199epoll\u670d\u52a1\u5668\u5728\u8c03\u7528epoll_wait\u51fd\u6570\u65f6\uff0c\u6211\u4eec\u5c06timeout\u7684\u503c\u8bbe\u7f6e\u6210\u4e86-1\uff0c\u56e0\u6b64\u8fd0\u884c\u670d\u52a1\u5668\u540e\u5982\u679c\u6ca1\u6709\u5ba2\u6237\u7aef\u53d1\u6765\u8fde\u63a5\u8bf7\u6c42\uff0c\u90a3\u4e48\u670d\u52a1\u5668\u5c31\u4f1a\u5728\u8c03\u7528epoll_wait\u51fd\u6570\u540e\u8fdb\u884c\u963b\u585e\u7b49\u5f85\u3002<img decoding=\"async\" src=\"https:\/\/cdn.codergodv.xyz\/ee1bb295e48b9a6736687fa21f6ecfb4.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"><\/p>\n\n\n\n<p>\u5f53\u6211\u4eec\u7528telnet\u5de5\u5177\u8fde\u63a5epoll\u670d\u52a1\u5668\u540e\uff0cepoll\u670d\u52a1\u5668\u8c03\u7528\u7684epoll_wait\u51fd\u6570\u5728\u68c0\u6d4b\u5230\u76d1\u542c\u5957\u63a5\u5b57\u7684\u8bfb\u4e8b\u4ef6\u5c31\u7eea\u540e\u5c31\u4f1a\u8c03\u7528accept\u83b7\u53d6\u5efa\u7acb\u597d\u7684\u8fde\u63a5\uff0c\u5e76\u6253\u5370\u8f93\u51fa\u5ba2\u6237\u7aef\u7684IP\u548c\u7aef\u53e3\u53f7\uff0c\u6b64\u65f6\u5ba2\u6237\u7aef\u53d1\u6765\u7684\u6570\u636e\u4e5f\u80fd\u591f\u6210\u529f\u88abepoll\u670d\u52a1\u5668\u6536\u5230\u5e76\u8fdb\u884c\u6253\u5370\u8f93\u51fa\u3002<img decoding=\"async\" src=\"https:\/\/cdn.codergodv.xyz\/282f5187987d74470cdc87c9007070e6.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"><\/p>\n\n\n\n<p>\u6b64\u5916\uff0c\u6211\u4eec\u8fd9\u91cc\u7f16\u5199\u7684\u4e5f\u662f\u4e00\u4e2a\u5355\u8fdb\u7a0b\u7684epoll\u670d\u52a1\u5668\uff0c\u4f46\u662f\u5b83\u53ef\u4ee5\u540c\u65f6\u4e3a\u591a\u4e2a\u5ba2\u6237\u7aef\u63d0\u4f9b\u670d\u52a1\u3002<img decoding=\"async\" src=\"https:\/\/cdn.codergodv.xyz\/5104efe4f9bd684eec7b4c6cc3499382.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"><\/p>\n\n\n\n<p>\u6211\u4eec\u53ef\u4ee5\u7528<code>ls \/proc\/PID\/fd<\/code>\u547d\u4ee4\uff0c\u67e5\u770b\u5f53\u524depoll\u670d\u52a1\u5668\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u4f7f\u7528\u60c5\u51b5\u3002\u5176\u4e2d\u6587\u4ef6\u63cf\u8ff0\u7b260\u30011\u30012\u662f\u9ed8\u8ba4\u6253\u5f00\u7684\uff0c\u5206\u522b\u5bf9\u5e94\u7684\u662f\u6807\u51c6\u8f93\u5165\u3001\u6807\u51c6\u8f93\u51fa\u548c\u6807\u51c6\u9519\u8bef\uff0c3\u53f7\u6587\u4ef6\u63cf\u8ff0\u7b26\u5bf9\u5e94\u7684\u662f\u76d1\u542c\u5957\u63a5\u5b57\uff0c4\u53f7\u6587\u4ef6\u63cf\u8ff0\u7b26\u5bf9\u5e94\u7684\u662f\u670d\u52a1\u5668\u521b\u5efa\u7684epoll\u6a21\u578b\uff0c5\u53f7\u548c6\u53f7\u6587\u4ef6\u63cf\u8ff0\u7b26\u5bf9\u5e94\u7684\u5206\u522b\u662f\u6b63\u5728\u8bbf\u95ee\u670d\u52a1\u5668\u7684\u4e24\u4e2a\u5ba2\u6237\u7aef\u3002<img decoding=\"async\" src=\"https:\/\/cdn.codergodv.xyz\/435e783c2f89d4eaf991fa7083503859.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"><\/p>\n\n\n\n<p>\u5f53\u670d\u52a1\u5668\u7aef\u68c0\u6d4b\u5230\u5ba2\u6237\u7aef\u9000\u51fa\u540e\uff0c\u4e5f\u4f1a\u5173\u95ed\u5bf9\u5e94\u7684\u8fde\u63a5\uff0c\u6b64\u65f6epoll\u670d\u52a1\u5668\u5bf9\u5e94\u76845\u53f7\u548c6\u53f7\u6587\u4ef6\u63cf\u8ff0\u7b26\u5c31\u5173\u95ed\u4e86\u3002<img decoding=\"async\" src=\"https:\/\/cdn.codergodv.xyz\/a2513ad9720fd590c0b123d4a91ce846.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">epoll\u7684\u4f18\u70b9<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u63a5\u53e3\u4f7f\u7528\u65b9\u4fbf\uff1a\u867d\u7136\u62c6\u5206\u6210\u4e86\u4e09\u4e2a\u51fd\u6570\uff0c\u4f46\u662f\u53cd\u800c\u4f7f\u7528\u8d77\u6765\u66f4\u65b9\u4fbf\u9ad8\u6548\u3002<\/li>\n\n\n\n<li>\u6570\u636e\u62f7\u8d1d\u8f7b\u91cf\uff1a\u53ea\u5728\u65b0\u589e\u76d1\u89c6\u4e8b\u4ef6\u7684\u65f6\u5019\u8c03\u7528epoll_ctl\u5c06\u6570\u636e\u4ece\u7528\u6237\u62f7\u8d1d\u5230\u5185\u6838\uff0c\u800cselect\u548cpoll\u6bcf\u6b21\u90fd\u9700\u8981\u91cd\u65b0\u5c06\u9700\u8981\u76d1\u89c6\u7684\u4e8b\u4ef6\u4ece\u7528\u6237\u62f7\u8d1d\u5230\u5185\u6838\u3002\u6b64\u5916\uff0c\u8c03\u7528epoll_wait\u83b7\u53d6\u5c31\u7eea\u4e8b\u4ef6\u65f6\uff0c\u53ea\u4f1a\u62f7\u8d1d\u5c31\u7eea\u7684\u4e8b\u4ef6\uff0c\u4e0d\u4f1a\u8fdb\u884c\u4e0d\u5fc5\u8981\u7684\u62f7\u8d1d\u64cd\u4f5c\u3002<\/li>\n\n\n\n<li>\u4e8b\u4ef6\u56de\u8c03\u673a\u5236\uff1a\u907f\u514d\u64cd\u4f5c\u7cfb\u7edf\u4e3b\u52a8\u8f6e\u8be2\u68c0\u6d4b\u4e8b\u4ef6\u5c31\u7eea\uff0c\u800c\u662f\u91c7\u7528\u56de\u8c03\u51fd\u6570\u7684\u65b9\u5f0f\uff0c\u5c06\u5c31\u7eea\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u7ed3\u6784\u52a0\u5165\u5230\u5c31\u7eea\u961f\u5217\u4e2d\u3002\u8c03\u7528epoll_wait\u65f6\u76f4\u63a5\u8bbf\u95ee\u5c31\u7eea\u961f\u5217\u5c31\u77e5\u9053\u54ea\u4e9b\u6587\u4ef6\u63cf\u8ff0\u7b26\u5df2\u7ecf\u5c31\u7eea\uff0c\u68c0\u6d4b\u662f\u5426\u6709\u6587\u4ef6\u63cf\u8ff0\u7b26\u5c31\u7eea\u7684\u65f6\u95f4\u590d\u6742\u5ea6\u662fO ( 1 ) O(1)O(1)\uff0c\u56e0\u4e3a\u672c\u8d28\u53ea\u9700\u8981\u5224\u65ad\u5c31\u7eea\u961f\u5217\u662f\u5426\u4e3a\u7a7a\u5373\u53ef\u3002<\/li>\n\n\n\n<li>\u6ca1\u6709\u6570\u91cf\u9650\u5236\uff1a\u76d1\u89c6\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u6570\u76ee\u65e0\u4e0a\u9650\uff0c\u53ea\u8981\u5185\u5b58\u5141\u8bb8\uff0c\u5c31\u53ef\u4ee5\u4e00\u76f4\u5411\u7ea2\u9ed1\u6811\u5f53\u4e2d\u65b0\u589e\u8282\u70b9\u3002<\/li>\n<\/ul>\n\n\n\n<p><strong>\u6ce8\u610f\uff1a<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u6709\u4eba\u8bf4epoll\u4e2d\u4f7f\u7528\u4e86\u5185\u5b58\u6620\u5c04\u673a\u5236\uff0c\u5185\u6838\u53ef\u4ee5\u76f4\u63a5\u5c06\u5e95\u5c42\u5c31\u7eea\u961f\u5217\u901a\u8fc7mmap\u7684\u65b9\u5f0f\u6620\u5c04\u5230\u7528\u6237\u6001\uff0c\u6b64\u65f6\u7528\u6237\u5c31\u53ef\u4ee5\u76f4\u63a5\u8bfb\u53d6\u5230\u5185\u6838\u4e2d\u5c31\u7eea\u961f\u5217\u5f53\u4e2d\u7684\u6570\u636e\uff0c\u907f\u514d\u4e86\u5185\u5b58\u62f7\u8d1d\u7684\u989d\u5916\u6027\u80fd\u5f00\u9500\u3002<\/li>\n\n\n\n<li>\u8fd9\u79cd\u8bf4\u6cd5\u662f\u9519\u8bef\u7684\uff0c\u5b9e\u9645\u64cd\u4f5c\u7cfb\u7edf\u5e76\u6ca1\u6709\u505a\u4efb\u4f55\u6620\u5c04\u673a\u5236\uff0c\u56e0\u4e3a\u64cd\u4f5c\u7cfb\u7edf\u662f\u4e0d\u76f8\u4fe1\u4efb\u4f55\u4eba\u7684\uff0c\u64cd\u4f5c\u7cfb\u7edf\u4e0d\u4f1a\u8ba9\u7528\u6237\u8fdb\u7a0b\u76f4\u63a5\u8bbf\u95ee\u5230\u5185\u6838\u7684\u6570\u636e\u7684\uff0c\u7528\u6237\u53ea\u80fd\u901a\u8fc7\u7cfb\u7edf\u8c03\u7528\u6765\u83b7\u53d6\u5185\u6838\u7684\u6570\u636e\u3002<\/li>\n\n\n\n<li>\u56e0\u6b64\u7528\u6237\u8981\u83b7\u53d6\u5185\u6838\u5f53\u4e2d\u7684\u6570\u636e\uff0c\u52bf\u5fc5\u8fd8\u662f\u9700\u8981\u5c06\u5185\u6838\u7684\u6570\u636e\u62f7\u8d1d\u5230\u7528\u6237\u7a7a\u95f4\u3002<\/li>\n<\/ul>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>\u4e0eselect\u548cpoll\u7684\u4e0d\u540c\u4e4b\u5904<\/p>\n<\/blockquote>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5728\u4f7f\u7528select\u548cpoll\u65f6\uff0c\u90fd\u9700\u8981\u501f\u52a9\u7b2c\u4e09\u65b9\u6570\u7ec4\u6765\u7ef4\u62a4\u5386\u53f2\u4e0a\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u4ee5\u53ca\u9700\u8981\u76d1\u89c6\u7684\u4e8b\u4ef6\uff0c\u8fd9\u4e2a\u7b2c\u4e09\u65b9\u6570\u7ec4\u662f\u7531\u7528\u6237\u81ea\u5df1\u7ef4\u62a4\u7684\uff0c\u5bf9\u8be5\u6570\u7ec4\u7684\u589e\u5220\u6539\u64cd\u4f5c\u90fd\u9700\u8981\u7528\u6237\u81ea\u5df1\u6765\u8fdb\u884c\u3002<\/li>\n\n\n\n<li>\u800c\u4f7f\u7528epoll\u65f6\uff0c\u4e0d\u9700\u8981\u7528\u6237\u81ea\u5df1\u7ef4\u62a4\u6240\u8c13\u7684\u7b2c\u4e09\u65b9\u6570\u7ec4\uff0cepoll\u5e95\u5c42\u7684\u7ea2\u9ed1\u6811\u5c31\u5145\u5f53\u4e86\u8fd9\u4e2a\u7b2c\u4e09\u65b9\u6570\u7ec4\u7684\u529f\u80fd\uff0c\u5e76\u4e14\u8be5\u7ea2\u9ed1\u6811\u7684\u589e\u5220\u6539\u64cd\u4f5c\u90fd\u662f\u7531\u5185\u6838\u7ef4\u62a4\u7684\uff0c\u7528\u6237\u53ea\u9700\u8981\u8c03\u7528epoll_ctl\u8ba9\u5185\u6838\u5bf9\u8be5\u7ea2\u9ed1\u6811\u8fdb\u884c\u5bf9\u5e94\u7684\u64cd\u4f5c\u5373\u53ef\u3002<\/li>\n\n\n\n<li>\u5728\u4f7f\u7528\u591a\u8def\u8f6c\u63a5\u63a5\u53e3\u65f6\uff0c\u6570\u636e\u6d41\u90fd\u6709\u4e24\u4e2a\u65b9\u5411\uff0c\u4e00\u4e2a\u662f\u7528\u6237\u544a\u77e5\u5185\u6838\uff0c\u4e00\u4e2a\u662f\u5185\u6838\u544a\u77e5\u7528\u6237\u3002select\u548cpoll\u5c06\u8fd9\u4e24\u4ef6\u4e8b\u60c5\u90fd\u4ea4\u7ed9\u4e86\u540c\u4e00\u4e2a\u51fd\u6570\u6765\u5b8c\u6210\uff0c\u800cepoll\u5728\u63a5\u53e3\u5c42\u9762\u4e0a\u5c31\u5c06\u8fd9\u4e24\u4ef6\u4e8b\u8fdb\u884c\u4e86\u5206\u79bb\uff0cepoll\u901a\u8fc7\u8c03\u7528epoll_ctl\u5b8c\u6210\u7528\u6237\u544a\u77e5\u5185\u6838\uff0c\u901a\u8fc7\u8c03\u7528epoll_wait\u5b8c\u6210\u5185\u6838\u544a\u77e5\u7528\u6237\u3002<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">epoll\u5de5\u4f5c\u65b9\u5f0f<\/h3>\n\n\n\n<p>epoll\u6709\u4e24\u79cd\u5de5\u4f5c\u65b9\u5f0f\uff0c\u5206\u522b\u662f\u6c34\u5e73\u89e6\u53d1\u5de5\u4f5c\u6a21\u5f0f\u548c\u8fb9\u7f18\u89e6\u53d1\u5de5\u4f5c\u6a21\u5f0f\u3002<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>\u6c34\u5e73\u89e6\u53d1\uff08LT\uff0cLevel Triggered\uff09<\/p>\n<\/blockquote>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u53ea\u8981\u5e95\u5c42\u6709\u4e8b\u4ef6\u5c31\u7eea\uff0cepoll\u5c31\u4f1a\u4e00\u76f4\u901a\u77e5\u7528\u6237\u3002<\/li>\n\n\n\n<li>\u5c31\u50cf\u6570\u5b57\u7535\u8def\u5f53\u4e2d\u7684\u9ad8\u7535\u5e73\u89e6\u53d1\u4e00\u6837\uff0c\u53ea\u8981\u4e00\u76f4\u5904\u4e8e\u9ad8\u7535\u5e73\uff0c\u5219\u4f1a\u4e00\u76f4\u89e6\u53d1\u3002<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/cdn.codergodv.xyz\/b5de18237662c3086c518e48d4d46cc9.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/cdn.codergodv.xyz\/b5de18237662c3086c518e48d4d46cc9.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/div><\/figure>\n\n\n\n<p>epoll\u9ed8\u8ba4\u72b6\u6001\u4e0b\u5c31\u662fLT\u5de5\u4f5c\u6a21\u5f0f\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u7531\u4e8e\u5728LT\u5de5\u4f5c\u6a21\u5f0f\u4e0b\uff0c\u53ea\u8981\u5e95\u5c42\u6709\u4e8b\u4ef6\u5c31\u7eea\u5c31\u4f1a\u4e00\u76f4\u901a\u77e5\u7528\u6237\uff0c\u56e0\u6b64\u5f53epoll\u68c0\u6d4b\u5230\u5e95\u5c42\u8bfb\u4e8b\u4ef6\u5c31\u7eea\u65f6\uff0c\u53ef\u4ee5\u4e0d\u7acb\u5373\u8fdb\u884c\u5904\u7406\uff0c\u6216\u8005\u53ea\u5904\u7406\u4e00\u90e8\u5206\uff0c\u56e0\u4e3a\u53ea\u8981\u5e95\u5c42\u6570\u636e\u6ca1\u6709\u5904\u7406\u5b8c\uff0c\u4e0b\u4e00\u6b21epoll\u8fd8\u4f1a\u901a\u77e5\u7528\u6237\u4e8b\u4ef6\u5c31\u7eea\u3002<\/li>\n\n\n\n<li>select\u548cpoll\u5176\u5b9e\u5c31\u662f\u5de5\u4f5c\u662fLT\u6a21\u5f0f\u4e0b\u7684\u3002<\/li>\n\n\n\n<li>\u652f\u6301\u963b\u585e\u8bfb\u5199\u548c\u975e\u963b\u585e\u8bfb\u5199\u3002<\/li>\n<\/ul>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>\u8fb9\u7f18\u89e6\u53d1\uff08ET\uff0cEdge Triggered\uff09<\/p>\n<\/blockquote>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u53ea\u6709\u5e95\u5c42\u5c31\u7eea\u4e8b\u4ef6\u6570\u91cf\u7531\u65e0\u5230\u6709\u6216\u7531\u6709\u5230\u591a\u53d1\u751f\u53d8\u5316\u7684\u65f6\u5019\uff0cepoll\u624d\u4f1a\u901a\u77e5\u7528\u6237\u3002<\/li>\n\n\n\n<li>\u5c31\u50cf\u6570\u5b57\u7535\u8def\u5f53\u4e2d\u7684\u4e0a\u5347\u6cbf\u89e6\u53d1\u4e00\u6837\uff0c\u53ea\u6709\u5f53\u7535\u5e73\u7531\u4f4e\u53d8\u9ad8\u7684\u90a3\u4e00\u77ac\u95f4\u624d\u4f1a\u89e6\u53d1\u3002<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/cdn.codergodv.xyz\/5f71a6960c1191b596dcfc02cd0ac5f5.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/cdn.codergodv.xyz\/5f71a6960c1191b596dcfc02cd0ac5f5.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/div><\/figure>\n\n\n\n<p>\u5982\u679c\u8981\u5c06epoll\u6539\u4e3aET\u5de5\u4f5c\u6a21\u5f0f\uff0c\u5219\u9700\u8981\u5728\u6dfb\u52a0\u4e8b\u4ef6\u65f6\u8bbe\u7f6e<code>EPOLLET<\/code>\u9009\u9879\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u7531\u4e8e\u5728ET\u5de5\u4f5c\u6a21\u5f0f\u4e0b\uff0c\u53ea\u6709\u5e95\u5c42\u5c31\u7eea\u4e8b\u4ef6\u65e0\u5230\u6709\u6216\u7531\u6709\u5230\u591a\u53d1\u751f\u53d8\u5316\u7684\u65f6\u5019\u624d\u4f1a\u901a\u77e5\u7528\u6237\uff0c\u56e0\u6b64\u5f53epoll\u68c0\u6d4b\u5230\u5e95\u5c42\u8bfb\u4e8b\u4ef6\u5c31\u7eea\u65f6\uff0c\u5fc5\u987b\u7acb\u5373\u8fdb\u884c\u5904\u7406\uff0c\u800c\u4e14\u5fc5\u987b\u5168\u90e8\u5904\u7406\u5b8c\u6bd5\uff0c\u56e0\u4e3a\u6709\u53ef\u80fd\u6b64\u540e\u5e95\u5c42\u518d\u4e5f\u6ca1\u6709\u4e8b\u4ef6\u5c31\u7eea\uff0c\u90a3\u4e48epoll\u5c31\u518d\u4e5f\u4e0d\u4f1a\u901a\u77e5\u7528\u6237\u8fdb\u884c\u4e8b\u4ef6\u5904\u7406\uff0c\u6b64\u65f6\u6ca1\u6709\u5904\u7406\u5b8c\u7684\u6570\u636e\u5c31\u76f8\u5f53\u4e8e\u4e22\u5931\u4e86\u3002<\/li>\n\n\n\n<li>ET\u5de5\u4f5c\u6a21\u5f0f\u4e0bepoll\u901a\u77e5\u7528\u6237\u7684\u6b21\u6570\u4e00\u822c\u6bd4LT\u5c11\uff0c\u56e0\u6b64ET\u7684\u6027\u80fd\u4e00\u822c\u6bd4LT\u6027\u80fd\u66f4\u9ad8\uff0cNginx\u5c31\u662f\u9ed8\u8ba4\u91c7\u7528ET\u6a21\u5f0f\u4f7f\u7528epoll\u7684\u3002<\/li>\n\n\n\n<li>\u53ea\u652f\u6301\u975e\u963b\u585e\u7684\u8bfb\u5199\u3002<\/li>\n<\/ul>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>ET\u5de5\u4f5c\u6a21\u5f0f\u4e0b\u5e94\u8be5\u5982\u4f55\u8fdb\u884c\u8bfb\u5199<\/p>\n<\/blockquote>\n\n\n\n<p>\u56e0\u4e3a\u5728ET\u5de5\u4f5c\u6a21\u5f0f\u4e0b\uff0c\u53ea\u6709\u5e95\u5c42\u5c31\u7eea\u4e8b\u4ef6\u65e0\u5230\u6709\u6216\u7531\u6709\u5230\u591a\u53d1\u751f\u53d8\u5316\u7684\u65f6\u5019\u624d\u4f1a\u901a\u77e5\u7528\u6237\uff0c\u8fd9\u5c31\u5012\u903c\u7528\u6237\u5f53\u8bfb\u4e8b\u4ef6\u5c31\u7eea\u65f6\u5fc5\u987b\u4e00\u6b21\u6027\u5c06\u6570\u636e\u5168\u90e8\u8bfb\u53d6\u5b8c\u6bd5\uff0c\u5f53\u5199\u4e8b\u4ef6\u5c31\u7eea\u65f6\u5fc5\u987b\u4e00\u6b21\u6027\u5c06\u53d1\u9001\u7f13\u51b2\u533a\u5199\u6ee1\uff0c\u5426\u5219\u53ef\u80fd\u518d\u4e5f\u6ca1\u6709\u673a\u4f1a\u8fdb\u884c\u8bfb\u5199\u4e86\u3002<\/p>\n\n\n\n<p>\u56e0\u6b64\u8bfb\u6570\u636e\u65f6\u5fc5\u987b\u5faa\u73af\u8c03\u7528recv\u51fd\u6570\u8fdb\u884c\u8bfb\u53d6\uff0c\u5199\u6570\u636e\u65f6\u5fc5\u987b\u5faa\u73af\u8c03\u7528send\u51fd\u6570\u8fdb\u884c\u5199\u5165\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5f53\u5e95\u5c42\u8bfb\u4e8b\u4ef6\u5c31\u7eea\u65f6\uff0c\u5faa\u73af\u8c03\u7528recv\u51fd\u6570\u8fdb\u884c\u8bfb\u53d6\uff0c\u76f4\u5230\u67d0\u6b21\u8c03\u7528recv\u8bfb\u53d6\u65f6\uff0c\u5b9e\u9645\u8bfb\u53d6\u5230\u7684\u5b57\u8282\u6570\u5c0f\u4e8e\u671f\u671b\u8bfb\u53d6\u7684\u5b57\u8282\u6570\uff0c\u5219\u8bf4\u660e\u672c\u6b21\u5e95\u5c42\u6570\u636e\u5df2\u7ecf\u8bfb\u53d6\u5b8c\u6bd5\u4e86\u3002<\/li>\n\n\n\n<li>\u4f46\u6709\u53ef\u80fd\u6700\u540e\u4e00\u6b21\u8c03\u7528recv\u8bfb\u53d6\u65f6\uff0c\u521a\u597d\u5b9e\u9645\u8bfb\u53d6\u7684\u5b57\u8282\u6570\u548c\u671f\u671b\u8bfb\u53d6\u7684\u5b57\u8282\u6570\u76f8\u7b49\uff0c\u4f46\u6b64\u65f6\u5e95\u5c42\u6570\u636e\u4e5f\u6070\u597d\u8bfb\u53d6\u5b8c\u6bd5\u4e86\uff0c\u5982\u679c\u6211\u4eec\u518d\u8c03\u7528recv\u51fd\u6570\u8fdb\u884c\u8bfb\u53d6\uff0c\u90a3\u4e48recv\u5c31\u4f1a\u56e0\u4e3a\u5e95\u5c42\u6ca1\u6709\u6570\u636e\u800c\u88ab\u963b\u585e\u4f4f\u3002<\/li>\n\n\n\n<li>\u800c\u8fd9\u91cc\u7684\u963b\u585e\u662f\u975e\u5e38\u4e25\u91cd\u7684\uff0c\u5c31\u6bd4\u5982\u6211\u4eec\u8fd9\u91cc\u5199\u7684\u670d\u52a1\u5668\u90fd\u662f\u5355\u8fdb\u7a0b\u7684\u670d\u52a1\u5668\uff0c\u5982\u679crecv\u88ab\u963b\u585e\u4f4f\uff0c\u5e76\u4e14\u6b64\u540e\u8be5\u6570\u636e\u518d\u4e5f\u4e0d\u5c31\u7eea\uff0c\u90a3\u4e48\u5c31\u76f8\u5f53\u4e8e\u6211\u4eec\u7684\u670d\u52a1\u5668\u6302\u6389\u4e86\uff0c\u56e0\u6b64\u5728ET\u5de5\u4f5c\u6a21\u5f0f\u4e0b\u5faa\u73af\u8c03\u7528recv\u51fd\u6570\u8fdb\u884c\u8bfb\u53d6\u65f6\uff0c\u5fc5\u987b\u5c06\u5bf9\u5e94\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u8bbe\u7f6e\u4e3a\u975e\u963b\u585e\u72b6\u6001\u3002<\/li>\n\n\n\n<li>\u8c03\u7528send\u51fd\u6570\u5199\u6570\u636e\u65f6\u4e5f\u662f\u540c\u6837\u7684\u9053\u7406\uff0c\u9700\u8981\u5faa\u73af\u8c03\u7528send\u51fd\u6570\u8fdb\u884c\u6570\u636e\u7684\u5199\u5165\uff0c\u5e76\u4e14\u5fc5\u987b\u5c06\u5bf9\u5e94\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u8bbe\u7f6e\u4e3a\u975e\u963b\u585e\u72b6\u6001\u3002<\/li>\n<\/ul>\n\n\n\n<p><strong>\u5f3a\u8c03\uff1a<\/strong> ET\u5de5\u4f5c\u6a21\u5f0f\u4e0b\uff0crecv\u548csend\u64cd\u4f5c\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u5fc5\u987b\u8bbe\u7f6e\u4e3a\u975e\u963b\u585e\u72b6\u6001\uff0c\u8fd9\u662f\u5fc5\u987b\u7684\uff0c\u4e0d\u662f\u53ef\u9009\u7684\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u5bf9\u6bd4LT\u548cET<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5728ET\u6a21\u5f0f\u4e0b\uff0c\u4e00\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\u5c31\u7eea\u4e4b\u540e\uff0c\u7528\u6237\u4e0d\u4f1a\u53cd\u590d\u6536\u5230\u901a\u77e5\uff0c\u770b\u8d77\u6765\u6bd4LT\u66f4\u9ad8\u6548\uff0c\u4f46\u5982\u679c\u5728LT\u6a21\u5f0f\u4e0b\u80fd\u591f\u505a\u5230\u6bcf\u6b21\u90fd\u5c06\u5c31\u7eea\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u7acb\u5373\u5168\u90e8\u5904\u7406\uff0c\u4e0d\u8ba9\u64cd\u4f5c\u7cfb\u7edf\u53cd\u590d\u901a\u77e5\u7528\u6237\u7684\u8bdd\uff0c\u5176\u5b9eLT\u548cET\u7684\u6027\u80fd\u4e5f\u662f\u4e00\u6837\u7684\u3002<\/li>\n\n\n\n<li>\u6b64\u5916\uff0cET\u7684\u7f16\u7a0b\u96be\u5ea6\u6bd4LT\u66f4\u9ad8\u3002<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>I\/O\u591a\u8def\u8f6c\u63a5\u4e4bselect select\u521d\u8bc6 select\u662f\u7cfb\u7edf\u63d0\u4f9b\u7684\u4e00\u4e2a\u591a\u8def\u8f6c\u63a5\u63a5\u53e3\u3002 select\u51fd\u6570  [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6,1],"tags":[39,36,38,37],"class_list":["post-165","post","type-post","status-publish","format-standard","hentry","category-linux","category-learn","tag-epoll","tag-io","tag-poll","tag-select"],"_links":{"self":[{"href":"https:\/\/codergodv.xyz\/index.php\/wp-json\/wp\/v2\/posts\/165","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/codergodv.xyz\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/codergodv.xyz\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/codergodv.xyz\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/codergodv.xyz\/index.php\/wp-json\/wp\/v2\/comments?post=165"}],"version-history":[{"count":1,"href":"https:\/\/codergodv.xyz\/index.php\/wp-json\/wp\/v2\/posts\/165\/revisions"}],"predecessor-version":[{"id":166,"href":"https:\/\/codergodv.xyz\/index.php\/wp-json\/wp\/v2\/posts\/165\/revisions\/166"}],"wp:attachment":[{"href":"https:\/\/codergodv.xyz\/index.php\/wp-json\/wp\/v2\/media?parent=165"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/codergodv.xyz\/index.php\/wp-json\/wp\/v2\/categories?post=165"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/codergodv.xyz\/index.php\/wp-json\/wp\/v2\/tags?post=165"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}