{"id":17591,"date":"2025-04-19T00:07:14","date_gmt":"2025-04-18T16:07:14","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/17591.html"},"modified":"2025-04-19T00:07:14","modified_gmt":"2025-04-18T16:07:14","slug":"%e3%80%90linux%e7%bd%91%e7%bb%9c%e7%bc%96%e7%a8%8b%e3%80%91%e9%ab%98%e6%95%88i-o-select-poll%e6%9c%8d%e5%8a%a1%e5%99%a8","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/17591.html","title":{"rendered":"\u3010Linux\u7f51\u7edc\u7f16\u7a0b\u3011\u9ad8\u6548I\/O--select\/poll\u670d\u52a1\u5668"},"content":{"rendered":"<p id=\"main-toc\">\u76ee\u5f55<\/p>\n<p id=\"-toc\" style=\"margin-left:0px\">\n<p id=\"%E5%A4%9A%E8%B7%AF%E8%BD%AC%E6%8E%A5%E4%B9%8Bselect-toc\" style=\"margin-left:0px\">\u591a\u8def\u8f6c\u63a5\u4e4bselect<\/p>\n<p id=\"select%E6%9C%8D%E5%8A%A1%E5%99%A8%E5%AE%9E%E7%8E%B0-toc\" style=\"margin-left:0px\">select\u670d\u52a1\u5668\u5b9e\u73b0<\/p>\n<p id=\"%E8%8E%B7%E5%8F%96%E8%BF%9E%E6%8E%A5-toc\" style=\"margin-left:40px\">\u83b7\u53d6\u8fde\u63a5<\/p>\n<p id=\"handlerEvent-toc\" style=\"margin-left:40px\">handlerEvent<\/p>\n<p id=\"select%E6%9C%8D%E5%8A%A1%E5%99%A8%E4%BB%A3%E7%A0%81%E9%93%BE%E6%8E%A5%C2%A0-toc\" style=\"margin-left:40px\">select\u670d\u52a1\u5668\u4ee3\u7801\u94fe\u63a5\u00a0<\/p>\n<p id=\"select%E7%9A%84%E4%BC%98%E7%BC%BA%E7%82%B9%C2%A0-toc\" style=\"margin-left:0px\">select\u7684\u4f18\u7f3a\u70b9\u00a0<\/p>\n<p id=\"%E5%A4%9A%E8%B7%AF%E8%BD%AC%E6%8E%A5%E4%B9%8Bpoll%C2%A0-toc\" style=\"margin-left:0px\">\u591a\u8def\u8f6c\u63a5\u4e4bpoll\u00a0<\/p>\n<p id=\"poll%E6%9C%8D%E5%8A%A1%E5%99%A8%E5%AE%9E%E7%8E%B0(select%E6%9C%8D%E5%8A%A1%E5%99%A8%E6%94%B9%E5%86%99)%C2%A0-toc\" style=\"margin-left:0px\">poll\u670d\u52a1\u5668\u5b9e\u73b0(select\u670d\u52a1\u5668\u6539\u5199)\u00a0<\/p>\n<p id=\"poll%E7%9A%84%E4%BC%98%E7%BC%BA%E7%82%B9-toc\" style=\"margin-left:0px\">poll\u7684\u4f18\u7f3a\u70b9<\/p>\n<hr id=\"hr-toc\" \/>\n<h2 id=\"%E5%A4%9A%E8%B7%AF%E8%BD%AC%E6%8E%A5%E4%B9%8Bselect\">\u591a\u8def\u8f6c\u63a5\u4e4bselect<\/h2>\n<p>select\u7684\u4f5c\u7528<\/p>\n<p>I\/O\u7684\u672c\u8d28 &#061; \u7b49 &#043; \u62f7\u8d1d<\/p>\n<p>\u591a\u8def\u8f6c\u63a5\u5c31\u662f\u901a\u8fc7\u540c\u65f6\u7b49\u5f85\u591a\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u65b9\u5f0f\u5b9e\u73b0\u6548\u7387\u7684\u63d0\u5347&#xff0c;\u8fd9\u4e9b\u5728\u4e94\u79cdI\/O\u6a21\u578b\u4e2d\u90fd\u8be6\u7ec6\u8bf4\u8fc7&#xff01;<\/p>\n<p>select\u662f\u5b9e\u73b0\u591a\u8def\u590d\u7528I\/O\u7684\u4e00\u79cd\u65b9\u5f0f<\/p>\n<p>\u4e00\u4e2a\u591a\u8def\u590d\u7528I\/O\u53ef\u4ee5\u5206\u4e3a\u4e24\u6b65&#xff1a;<\/p>\n<ul>\n<li>\u540c\u65f6\u7b49\u5f85\u591a\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26<\/li>\n<li>I\/O\u6761\u4ef6\u5c31\u7eea&#xff0c;\u76f4\u63a5\u8fdb\u884c\u62f7\u8d1d<\/li>\n<\/ul>\n<p>select\u5b8c\u6210\u7684\u5de5\u4f5c\u5c31\u662fI\/O\u7b49\u5f85\u8fd9\u4e00\u6b65&#xff0c;\u5373\u5bf9\u591a\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\u8fdb\u884c\u7b49\u5f85&#xff0c;\u82e5\u6709\u4e00\u4e2a\u6216\u591a\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\u8bfb\u5199\u6761\u4ef6\u5c31\u7eea&#xff0c;select\u5c31\u4f1a\u8fd4\u56de&#xff01;<\/p>\n<p>select\u8fd4\u56de\u540e&#xff0c;\u5373\u8fdb\u884c\u591a\u8def\u590d\u7528\u7684\u7b2c\u4e8c\u6b65\u62f7\u8d1d\u3002\u62f7\u8d1d\u662f\u7531read\/write&#8230;\u8fd9\u4e9b\u62f7\u8d1d\u51fd\u6570\u5b9e\u73b0\u7684&#xff01;<\/p>\n<hr \/>\n<p>select\u8c03\u7528<\/p>\n<p>int select(int nfds, fd_set *readfds,<br \/>\n fd_set *writefds, fd_set *exceptfds, struct timeval *timeout);<\/p>\n<ul>\n<li>nfds&#xff1a;\u8868\u793a\u4f60\u9700\u8981\u76d1\u7ba1\u7684\u6240\u6709\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u4e2d&#xff0c;\u6700\u5927\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26&#043;1<\/li>\n<li>readfds&#xff1a;\u6307\u5411fd_set\u7684\u6307\u9488&#xff0c;\u5305\u542b\u9700\u8981\u76d1\u89c6\u7684\u53ef\u8bfb\u6587\u4ef6\u63cf\u8ff0\u7b26<\/li>\n<li>writefds&#xff1a;\u6307\u5411fd_set\u7684\u6307\u9488&#xff0c;\u5305\u542b\u9700\u8981\u76d1\u89c6\u7684\u53ef\u5199\u6587\u4ef6\u63cf\u8ff0\u7b26&#xff08;\u53ef\u9009&#xff09;\u3002<\/li>\n<li>exceptfds&#xff1a;\u6307\u5411fd_set\u7684\u6307\u9488&#xff0c;\u5305\u542b\u9700\u8981\u76d1\u89c6\u7684\u5f02\u5e38\u6587\u4ef6\u63cf\u8ff0\u7b26&#xff08;\u53ef\u9009&#xff09;\u3002<\/li>\n<li>timeout&#xff1a;\u6307\u5b9aselect\u8fdb\u884c\u7b49\u5f85\u65f6\u7684\u7b49\u5f85\u89c4\u5219<\/li>\n<li>\u8fd4\u56de\u503c&#xff1a;\u82e5\u5927\u4e8e0&#xff0c;\u5219\u8868\u793a\u5b9e\u9645I\/O\u6761\u4ef6\u5c31\u7eea\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u4e2a\u6570\u3002\u82e5\u7b49\u4e8e0&#xff0c;\u5219\u8868\u793a\u8d85\u65f6\u3002\u82e5\u5c0f\u4e8e0&#xff0c;\u5219\u8868\u793aselect\u53d1\u751f\u9519\u8bef&#xff0c;\u9519\u8bef\u7801\u88ab\u8bbe\u7f6e<\/li>\n<li>\u5934\u6587\u4ef6&#xff1a;sys\/select.h<\/li>\n<\/ul>\n<p>\u4ee5\u4e0b\u662f\u5bf9select\u53c2\u6570\u7684\u8be6\u7ec6\u4ecb\u7ecd\u00a0<\/p>\n<hr \/>\n<p>timeout\u53c2\u6570\u00a0<\/p>\n<p>\u00a0struct timeval\u7c7b\u578b\u7684\u7ed3\u6784&#xff1a;<\/p>\n<p>struct timeval {<br \/>\n    long tv_sec;   \/\/ \u79d2\u6570<br \/>\n    long tv_usec;  \/\/ \u5fae\u79d2\u6570<br \/>\n}; <\/p>\n<ul>\n<li>\u82e5tv_sec\u8bbe\u7f6e\u4e3a0&#xff0c;\u4e14tv_usec\u8bbe\u7f6e\u4e3a0&#xff0c;\u5219\u8868\u793a\u7684\u662fselect\u8fdb\u884c\u975e\u963b\u585e\u7b49\u5f85\u3002\u5373\u4fbf\u6ca1\u6709\u4efb\u4f55\u4e00\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\u5c31\u7eea&#xff0c;select\u4f9d\u65e7\u4f1a\u8fd4\u56de0<\/li>\n<li>\u82e5timeout\u53c2\u6570\u8bbe\u7f6e\u4e3aNULL&#xff0c;\u5219\u8868\u793aselect\u8fdb\u884c\u963b\u585e\u7b49\u5f85&#xff0c;\u5728\u6ca1\u6709\u4efb\u4f55\u5916\u90e8\u5e72\u6270&#xff08;\u5982\u4fe1\u53f7\u4e2d\u65ad&#xff09;\u7684\u60c5\u51b5\u4e0b&#xff0c;\u82e5\u6ca1\u6709\u4efb\u4f55\u4e00\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\u5c31\u7eea&#xff0c;\u5219select\u6c38\u4e0d\u8fd4\u56de&#xff0c;\u76f4\u5230\u6709\u4e00\u4e2a\u6216\u591a\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\u5c31\u7eea\u4e3a\u6b62<\/li>\n<li>\u82e5timeout\u4e2d\u7684tv_sec\u6216tv_usec\u8bbe\u7f6e\u4e3a&gt;0\u7684\u6570&#xff0c;\u6b64\u65f6\u7684timeout\u662f\u4e00\u4e2a\u8f93\u5165\u548c\u8f93\u51fa\u578b\u53c2\u6570\u3002\u4f8b\u5982timeout\u8bbe\u7f6e\u4e3a5\u79d20\u5fae\u79d2\u4e4b\u540e\u4f20\u5165select&#xff0c;\u8fc7\u4e86\u4e24\u79d2\u4ee5\u540e\u6709\u4e00\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\u5c31\u7eea\u4e86&#xff0c;\u90a3\u4e48select\u8fd4\u56de&#xff0c;timeout\u88ab\u4fee\u6539\u4e3a3\u79d20\u5fae\u79d2<\/li>\n<\/ul>\n<hr \/>\n<p>fd_set\u7c7b\u578b\u00a0<\/p>\n<p>\u8bfb\u5199\u6761\u4ef6\u5c31\u7eea&#xff1a;<\/p>\n<ul>\n<li>\u82e5\u4e00\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\u53ef\u4ee5\u8fdb\u884c\u8bfb\u4e86&#xff0c;\u5373\u8be5\u6587\u4ef6\u7684\u5185\u6838\u63a5\u6536\u7f13\u51b2\u533a\u6709\u6570\u636e\u4e86&#xff0c;\u6211\u4eec\u79f0\u8be5\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u8bfb\u6761\u4ef6\u5c31\u7eea<\/li>\n<li>\u82e5\u4e00\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\u53ef\u4ee5\u8fdb\u884c\u5199\u4e86&#xff0c;\u5373\u8be5\u6587\u4ef6\u7684\u5185\u6838\u53d1\u9001\u7f13\u51b2\u533a\u672a\u6ee1&#xff0c;\u6211\u4eec\u79f0\u8be5\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u5199\u6761\u4ef6\u5c31\u7eea<\/li>\n<\/ul>\n<p>fd_set\u5185\u90e8\u662f\u4e00\u4e2a\u5bf9\u5e94\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u4f4d\u56fe\u7ed3\u6784<\/p>\n<p>select\u53c2\u6570\u4e2d\u7684fd_set\u7c7b\u578b\u53c2\u6570\u542b\u4e49&#xff1a;<\/p>\n<ul>\n<li>readfds&#xff1a;\u8be5\u6587\u4ef6\u63cf\u8ff0\u7b26\u96c6\u4e2d\u6bd4\u7279\u4f4d\u7684\u503c\u4e3a1\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26&#xff0c;select\u53ea\u5173\u5fc3\u8be5\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u8bfb\u6761\u4ef6\u662f\u5426\u5c31\u7eea<\/li>\n<li>writefds&#xff1a;\u8be5\u6587\u4ef6\u63cf\u8ff0\u7b26\u96c6\u4e2d\u6bd4\u7279\u4f4d\u7684\u503c\u4e3a1\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26&#xff0c;select\u53ea\u5173\u5fc3\u8be5\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u5199\u6761\u4ef6\u662f\u5426\u5c31\u7eea<\/li>\n<li>exceptfds&#xff1a;\u8be5\u6587\u4ef6\u63cf\u8ff0\u7b26\u96c6\u4e2d\u6bd4\u7279\u4f4d\u7684\u503c\u4e3a1\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26&#xff0c;select\u53ea\u5173\u5fc3\u8be5\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u5f02\u5e38\u6761\u4ef6\u662f\u5426\u5c31\u7eea<\/li>\n<li>\u82e5\u9700\u8981select\u540c\u65f6\u5173\u5fc3\u4e00\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u8bfb\u5199\u6761\u4ef6&#xff0c;\u5373\u628areadfds\u548cwritefds\u5bf9\u5e94\u4f4d\u7f6e\u7684\u503c\u540c\u65f6\u8bbe\u7f6e\u4e3a1<\/li>\n<li>\u82e5\u65e0\u9700select\u5173\u5fc3\u5f02\u5e38\u65f6\u95f4&#xff0c;\u6211\u4eec\u628aexceptfds\u8bbe\u7f6e\u4e3a\u7a7a\u5373\u53ef&#xff01;<\/li>\n<\/ul>\n<p>select\u53c2\u6570\u4e2d\u7684\u4e09\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\u96c6\u90fd\u662f\u5373\u662f\u8f93\u5165\u578b\u53c2\u6570&#xff0c;\u53c8\u662f\u8f93\u51fa\u578b\u53c2\u6570<\/p>\n<ul>\n<li>\u4ee5readfds\u4e3a\u4f8b<\/li>\n<li>\u5f53readfds\u4f5c\u4e3a\u8f93\u5165\u578b\u53c2\u6570\u7684\u65f6\u5019&#xff0c;\u8868\u793a\u7684\u542b\u4e49\u662f&#xff1a;\u7528\u6237\u544a\u8bc9\u5185\u6838\u9700\u8981\u5173\u5fc3readfds\u4e2d\u6240\u6709\u7684fd\u7684\u8bfb\u4e8b\u4ef6<\/li>\n<li>\u5f53readfds\u4f5c\u4e3a\u8f93\u51fa\u578b\u53c2\u6570\u7684\u65f6\u5019&#xff0c;\u8868\u793a\u7684\u542b\u4e49\u662f&#xff1a;\u5185\u6838\u544a\u8bc9\u7528\u6237\u9700\u8981\u5173\u5fc3\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u4e2d&#xff0c;\u6709\u54ea\u4e9b\u5df2\u7ecf\u5c31\u7eea\u4e86<\/li>\n<\/ul>\n<p>fd_set\u8f93\u5165\u8f93\u51fa\u65f6\u4f4d\u56fe\u7684\u542b\u4e49&#xff1a;<\/p>\n<ul>\n<li>\u5f53\u4f5c\u4e3a\u8f93\u5165\u578b\u53c2\u6570\u7684\u65f6\u5019&#xff0c;\u6bd4\u7279\u4f4d\u7684\u4f4d\u7f6e\u8868\u793a\u7684\u662f\u7b2c\u51e0\u53f7fd&#xff0c;\u6bd4\u7279\u4f4d\u7684\u503c\u8868\u793a\u662f\u5426\u9700\u8981\u5185\u6838\u5173\u5fc3\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684xx\u4e8b\u4ef6\u3002\u82e5\u6bd4\u7279\u4f4d\u7684\u503c\u4e3a0\u8868\u793a\u65e0\u9700\u5185\u6838\u5173\u5fc3\u8be5\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684xx\u4e8b\u4ef6&#xff0c;\u82e5\u6bd4\u7279\u4f4d\u7684\u503c\u4e3a1\u8868\u793a\u9700\u8981\u5185\u6838\u5173\u5fc3\u8be5\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684xx\u4e8b\u4ef6<\/li>\n<li>\u5f53\u4f5c\u4e3a\u8f93\u51fa\u578b\u53c2\u6570\u7684\u65f6\u5019&#xff0c;\u6bd4\u7279\u4f4d\u7684\u4f4d\u7f6e\u8868\u793a\u7684\u662f\u7b2c\u51e0\u53f7fd&#xff0c;\u6bd4\u7279\u4f4d\u7684\u503c\u8868\u793a\u9700\u8981\u5185\u6838\u5173\u5fc3\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u4e2d&#xff0c;\u54ea\u4e9b\u5df2\u7ecf\u5c31\u7eea\u4e86\u3002\u82e5\u6bd4\u7279\u4f4d\u7684\u503c\u4e3a0\u8868\u793a\u672a\u5173\u5fc3\u6216\u672a\u5c31\u7eea&#xff0c;\u82e5\u6bd4\u7279\u4f4d\u7684\u503c\u4e3a1\u8868\u793a\u5df2\u5c31\u7eea<\/li>\n<\/ul>\n<hr \/>\n<p>\u6587\u4ef6\u63cf\u8ff0\u7b26\u96c6\u7684\u64cd\u4f5c<\/p>\n<p>\u5bf9fd_set\u7684\u64cd\u4f5c\u53ea\u5141\u8bb8\u4f7f\u7528\u7cfb\u7edf\u8c03\u7528&#xff0c;\u4e0d\u5141\u8bb8\u81ea\u5df1\u53bb\u6539&#xff0c;\u54ea\u6015\u4f60\u5df2\u7ecf\u77e5\u9053\u4e86\u5b83\u662f\u4e2a\u4f4d\u56fe<\/p>\n<p>\u6587\u4ef6\u63cf\u8ff0\u7b26\u96c6\u7684\u5934\u6587\u4ef6\u662f&#xff1a;sys\/select.h<\/p>\n<p>\u6e05\u7a7a(\u6240\u6709\u6bd4\u7279\u4f4d\u6e05\u96f6)\u6587\u4ef6\u63cf\u8ff0\u7b26\u96c6&#xff1a;FD_ZERO<\/p>\n<p>void FD_ZERO(fd_set *set);<\/p>\n<ul>\n<li>\u529f\u80fd&#xff1a;\u628aset\u6587\u4ef6\u63cf\u8ff0\u7b26\u96c6\u4e2d\u7684\u6240\u6709\u6bd4\u7279\u4f4d\u6e05\u96f6\u00a0<\/li>\n<\/ul>\n<p>\u6e05\u96f6\u6587\u4ef6\u63cf\u8ff0\u7b26\u96c6\u4e2d\u6307\u5b9afd\u7684\u503c&#xff1a;FD_CLR<\/p>\n<p>void FD_CLR(int fd, fd_set *set);<\/p>\n<ul>\n<li>\u529f\u80fd&#xff1a;\u628aset\u96c6\u4e2dfd\u5bf9\u5e94\u7684\u6bd4\u7279\u4f4d\u6e05\u96f6\u00a0<\/li>\n<\/ul>\n<p>\u5224\u65ad\u6587\u4ef6\u63cf\u8ff0\u7b26\u96c6\u4e2d\u6307\u5b9afd\u7684\u503c&#xff1a;FD_ISSET<\/p>\n<p>int  FD_ISSET(int fd, fd_set *set); <\/p>\n<ul>\n<li>\u529f\u80fd&#xff1a;\u5224\u65adset\u96c6\u4e2dfd\u5bf9\u5e94\u7684\u6bd4\u7279\u4f4d\u662f\u5426\u4e3a1<\/li>\n<li>\u8fd4\u56de\u503c&#xff1a;\u5c31\u662fset\u96c6\u4e2dfd\u5bf9\u5e94\u6bd4\u7279\u4f4d\u7684\u503c\u3002(\u82e5\u5728\u5373\u4e3a1&#xff0c;\u82e5\u4e0d\u5728\u5373\u4e3a0)<\/li>\n<\/ul>\n<p>\u65b0\u589e(\u7f6e\u4e3a1)\u6587\u4ef6\u63cf\u8ff0\u7b26\u96c6\u4e2d\u6307\u5b9afd&#xff1a;FD_SET<\/p>\n<p>void FD_SET(int fd, fd_set *set);<\/p>\n<ul>\n<li>\u529f\u80fd&#xff1a;\u628aset\u96c6\u4e2dfd\u5bf9\u5e94\u7684\u6bd4\u7279\u4f4d\u7f6e\u4e3a1<\/li>\n<\/ul>\n<hr \/>\n<h2 id=\"select%E6%9C%8D%E5%8A%A1%E5%99%A8%E5%AE%9E%E7%8E%B0\" style=\"background-color:transparent\">select\u670d\u52a1\u5668\u5b9e\u73b0<\/h2>\n<p>select\u670d\u52a1\u5668\u548c\u4e00\u4e2a\u7b80\u5355\u7684TCP\u670d\u52a1\u5668\u7684\u533a\u522b\u4e3b\u8981\u4f53\u73b0\u5728I\/O\u4e0a&#xff0c;\u6240\u4ee5\u6211\u4eec\u57fa\u4e8e\u6211\u4eec\u4e4b\u524d\u5199\u8fc7\u7684TCP\u670d\u52a1\u5668\u8fdb\u884c\u4fee\u6539\u5373\u53ef&#xff01;TCP\u670d\u52a1\u5668<\/p>\n<p>select\u670d\u52a1\u5668 vs \u4e4b\u524d\u7684TCP\u670d\u52a1\u5668<\/p>\n<ul>\n<li>\u76f8\u540c\u70b9&#xff1a;\u90fd\u662f\u8981\u521b\u5efa\u5957\u63a5\u5b57\u5e76\u57fa\u4e8e\u5957\u63a5\u5b57\u8fdb\u884c\u901a\u4fe1&#xff0c;\u751a\u81f3\u6784\u5efa\u5957\u63a5\u5b57\u7684\u8fc7\u7a0b\u90fd\u4e00\u6478\u4e00\u6837<\/li>\n<li>\u4e0d\u540c\u70b9&#xff1a;select\u7684I\/O\u65b9\u6848\u91c7\u7528\u7684\u662f\u591a\u8def\u8f6c\u63a5&#xff0c;\u800c\u4e4b\u524d\u7684TCP\u670d\u52a1\u5668\u662f\u91c7\u7528\u963b\u585eI\/O\u7684\u65b9\u5f0f<\/li>\n<\/ul>\n<p>\u57fa\u4e8e\u4e0a\u8ff0\u539f\u56e0&#xff0c;\u6240\u4ee5\u5bf9\u4e8eselect\u670d\u52a1\u5668\u6765\u8bf4&#xff0c;\u53ea\u9700\u8981\u5728TCP\u670d\u52a1\u5668\u7684\u57fa\u7840\u4e0a&#xff0c;\u4fee\u6539Loop\u51fd\u6570\u5373\u53ef<\/p>\n<hr \/>\n<h3 id=\"%E8%8E%B7%E5%8F%96%E8%BF%9E%E6%8E%A5\">\u83b7\u53d6\u8fde\u63a5<\/h3>\n<p>accept\u7684\u672c\u8d28\u5176\u5b9e\u4e5f\u662fI\/O&#xff0c;I\/O &#061; \u7b49 &#043; \u62f7\u8d1d&#xff0c;accept\u4e5f\u662f\u7b49&#043;\u62f7\u8d1d\u3002<\/p>\n<p>\u6240\u4ee5\u65b0\u8fde\u63a5\u5230\u6765\u65f6\u5c31\u7b49\u4ef7\u4e8e\u6709\u4e86\u8bfb\u4e8b\u4ef6\u3002<\/p>\n<p>\u8bfb\u4e8b\u4ef6\u53ef\u4ee5\u7531select\u8fdb\u884c\u76d1\u7ba1&#xff0c;\u5373\u53ef\u4ee5\u628alisten\u5957\u63a5\u5b57\u6dfb\u52a0\u5230readfds\u4e2d<\/p>\n<p>\u628alisten\u5957\u63a5\u5b57\u4ea4\u7531select\u8fdb\u884c\u76d1\u7ba1\u8981\u5b8c\u6210\u76843\u4e2a\u6b65\u9aa4&#xff1a;<\/p>\n<ul>\n<li>\u5b9a\u4e49fd_set<\/li>\n<li>\u586b\u5145fd_set<\/li>\n<li>\u7cfb\u7edf\u8c03\u7528select\u00a0<\/li>\n<\/ul>\n<p>\u00a0select\u83b7\u53d6\u5230\u54ea\u4e9bfd\u6761\u4ef6\u5c31\u7eea&#xff0c;\u8fdb\u884c\u8fd4\u56de\u65f6&#xff0c;\u6211\u4eec\u8981\u6839\u636eselect\u7684\u8fd4\u56de\u503c\u6765\u5206\u60c5\u51b5\u5904\u7406<\/p>\n<ul>\n<li>\u82e5select\u7684\u8fd4\u56de\u503c\u5927\u4e8e0&#xff0c;\u8868\u793a\u5df2\u7ecf\u6709\u591a\u5c11\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u6761\u4ef6\u5c31\u7eea\u3002\u4e0a\u5c42\u5df2\u7ecf\u53ef\u4ee5\u6839\u636ereadfds\u8fdb\u884c\u5904\u7406\u4e86<\/li>\n<li>\u82e5select\u7684\u8fd4\u56de\u503c\u7b49\u4e8e0&#xff0c;\u5219\u8868\u793a\u8d85\u65f6\u3002\u82e5select\u662f\u963b\u585e\u76d1\u7ba1&#xff0c;\u90a3\u4e48select\u4e0d\u4f1a\u8fd4\u56de0\u3002<\/li>\n<li>\u82e5select\u7684\u8fd4\u56de\u503c\u5c0f\u4e8e0&#xff0c;\u5219\u8868\u793aselect\u53d1\u751f\u9519\u8bef\u3002<\/li>\n<\/ul>\n<p>    void Loop() \/\/ \u4fee\u6539I\/O\u4e3aselect<br \/>\n    {<br \/>\n        while(true)\/\/\u9700\u8981\u4e0d\u65ad\u83b7\u53d6\u8fde\u63a5&#xff0c;\u6253\u4e0a\u6b7b\u5faa\u73af\u5373\u53ef<br \/>\n        {<br \/>\n            \/\/\u5b9a\u4e49fd_set<br \/>\n            fd_set rfds;<br \/>\n            \/\/\u586b\u5145fd_set<br \/>\n            FD_ZERO(&amp;rfds);<br \/>\n            FD_SET(_listensock,&amp;rfds);<br \/>\n            \/\/\u8c03\u7528select<br \/>\n            int n &#061; select(_listensock &#043; 1 , &amp;rfds,nullptr,nullptr,nullptr);\/\/select\u53ea\u5173\u5fc3\u8bfb\u4e8b\u4ef6&#xff0c;\u5e76\u4e14\u963b\u585e\u7b49\u5f85<br \/>\n            if(n &gt; 0)<br \/>\n            {<br \/>\n                \/\/\u8868\u793a\u5df2\u7ecf\u6709\u6587\u4ef6\u63cf\u8ff0\u7b26\u6761\u4ef6\u5c31\u7eea\u4e86&#xff0c;\u6b64\u65f6rfds\u4e2d\u6bd4\u7279\u4f4d\u4e3a1\u7684\u4f4d\u7f6e\u5c31\u662f\u5df2\u7ecf\u5c31\u7eea\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26<br \/>\n                handlerEvent(rfds);<br \/>\n            }<br \/>\n            else if(n &#061;&#061; 0)<br \/>\n            {<br \/>\n                \/\/\u963b\u585e\u7b49\u5f85\u4e0d\u4f1a\u8d70\u5230\u8fd9<br \/>\n                std::cout &lt;&lt; &#034;timeout&#8230;&#034; &lt;&lt; std::endl;<br \/>\n            }<br \/>\n            else<br \/>\n            {<br \/>\n                std::cerr &lt;&lt; &#034;Select Error!&#034; &lt;&lt; std::endl;<br \/>\n                exit(2);<br \/>\n            }<br \/>\n        } <\/p>\n<hr \/>\n<h3 id=\"handlerEvent\">handlerEvent<\/h3>\n<p>\u4e0a\u8ff0&#xff0c;\u6211\u4eec\u5df2\u7ecf\u5c06listen\u5957\u63a5\u5b57\u4ea4\u7ed9select\u8fdb\u884c\u76d1\u7ba1\u4e86\u3002\u90a3\u4e48\u82e5listen\u5957\u63a5\u5b57\u8bfb\u6761\u4ef6\u5c31\u7eea&#xff0c;\u5373\u6709\u5ba2\u6237\u7aef\u5411\u53d1\u9001\u8fde\u63a5\u65f6&#xff0c;\u5982\u4f55\u5904\u7406\u5462&#xff1f;<\/p>\n<p>\u8fd9\u5c31\u7531handlerEvent\u8fdb\u884c\u5904\u7406<\/p>\n<p>\u7531\u4e8eselect\u76d1\u7ba1\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u53ef\u80fd\u662flisten\u5957\u63a5\u5b57&#xff0c;\u4e5f\u53ef\u80fd\u662f\u666e\u901a\u5957\u63a5\u5b57&#xff0c;\u6240\u4ee5\u6211\u4eec\u9700\u8981\u5bf9\u8fd9\u4e24\u79cd\u5957\u63a5\u5b57\u8fdb\u884c\u5206\u7c7b\u8ba8\u8bba<\/p>\n<p>\u5bf9\u4e8elisten\u5957\u63a5\u5b57\u6765\u8bf4&#xff1a;<\/p>\n<ul>\n<li>listen\u5957\u63a5\u5b57\u7684\u8bfb\u4e8b\u4ef6\u5c31\u7eea&#xff0c;\u4e5f\u5c31\u610f\u5473\u7740\u6709\u65b0\u7684\u5ba2\u6237\u7aef\u8fde\u63a5\u5230\u6765&#xff0c;\u6211\u4eec\u9996\u5148\u8981accept\u65b0\u8fde\u63a5<\/li>\n<li>accept\u8fc7\u540e\u4f1a\u83b7\u53d6\u4e00\u4e2a\u65b0\u7684\u666e\u901a\u5957\u63a5\u5b57&#xff0c;\u6211\u4eec\u9700\u8981\u628a\u666e\u901a\u5957\u63a5\u5b57\u4ea4\u7ed9select\u8fdb\u884c\u76d1\u7ba1<\/li>\n<\/ul>\n<p>\u5bf9\u4e8e\u666e\u901a\u5957\u63a5\u5b57\u6765\u8bf4&#xff1a;<\/p>\n<ul>\n<li>\u666e\u901a\u5957\u63a5\u5b57\u7684\u8bfb\u4e8b\u4ef6\u5c31\u7eea&#xff0c;\u4e5f\u5c31\u610f\u5473\u7740\u5ba2\u6237\u7aef\u53d1\u6765\u4e86\u4e00\u6761\u65b0\u7684I\/O\u6570\u636e<\/li>\n<li>\u6b64\u65f6\u670d\u52a1\u5668\u63d0\u4f9b\u670d\u52a1\u5373\u53ef&#xff01;\u00a0<\/li>\n<\/ul>\n<hr \/>\n<p>\u7ec6\u8282\u95ee\u9898&#xff1a;\u8f85\u52a9\u6570\u7ec4<\/p>\n<p>\u5f53\u7528\u6237\u8c03\u7528select\u4f20\u5165rfds\u65f6&#xff0c;\u6b64\u65f6\u7684rfds\u662f\u8f93\u5165\u578b\u53c2\u6570<\/p>\n<p>\u5f53select\u8fd4\u56de\u65f6&#xff0c;\u6b64\u65f6\u7684rfds\u662f\u8f93\u51fa\u578b\u53c2\u6570<\/p>\n<p>rfds\u4f5c\u4e3a\u8f93\u5165\u578b\u53c2\u6570\u548c\u8f93\u51fa\u578b\u53c2\u6570\u65f6&#xff0c;\u542b\u4e49\u662f\u5b8c\u5168\u4e0d\u540c\u7684&#xff01;<\/p>\n<p>\u4e3e\u4e2a\u4f8b\u5b50&#xff1a;\u82e5\u6211\u4eec\u8c03\u7528select\u65f6\u8bbe\u7f6e\u4e861\u53f73\u53f75\u53f7\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u8bfb\u4e8b\u4ef6\u3002\u5047\u8bbeselect\u5728\u76d1\u7ba1\u65f6\u53ea\u67093\u53f7\u6587\u4ef6\u63cf\u8ff0\u7b26\u5c31\u7eea\u4e86&#xff0c;\u90a3\u4e48select\u4f1a\u76f4\u63a5\u4fee\u6539rfds&#xff0c;\u6b64\u65f6\u6ca1\u6709\u5c31\u7eea\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u5c31\u88ab\u4fee\u6539\u4e86<\/p>\n<p>\u00a0<img loading=\"lazy\" decoding=\"async\" alt=\"\" height=\"325\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250418160711-680278afefb8a.png\" width=\"721\" \/><\/p>\n<ul>\n<li>rfds\u88abselect\u4fee\u6539\u4e86&#xff0c;\u4f46\u6211\u4eec\u4e4b\u540e\u8fd8\u9700\u8981\u5173\u5fc31\u53f7\u548c5\u53f7\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u8bfb\u4e8b\u4ef6&#xff01;\u00a0<\/li>\n<\/ul>\n<p>\u4e3a\u4e86\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898&#xff0c;\u6240\u4ee5\u8c03\u7528select\u65f6\u4e00\u822c\u4f1a\u642d\u914d\u4e0a\u4e00\u4e2a\u8f85\u52a9\u6570\u636e\u7ed3\u6784\u6765\u5b9e\u73b0&#xff01;(\u4ee5\u6570\u7ec4\u4e3a\u4f8b)<\/p>\n<p>\u8f85\u52a9\u6570\u7ec4\u4e2d\u4e00\u822c\u4f1a\u5b58\u50a8\u8c03\u7528select\u4e4b\u524d\u7684rfds&#xff0c;\u65b9\u4fbf\u5185\u6838\u4fee\u6539\u4e86rfds\u540e&#xff0c;\u7528\u6237\u8fdb\u884c\u91cd\u65b0\u8bbe\u7f6e<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" alt=\"\" height=\"752\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250418160712-680278b015452.png\" width=\"1200\" \/><\/p>\n<p>\u5728\u670d\u52a1\u5668\u6784\u9020\u7684\u65f6\u5019&#xff0c;\u6211\u4eec\u53ef\u4ee5\u76f4\u63a5\u6784\u9020\u597d\u8f85\u52a9\u6570\u7ec4&#xff0c;\u6b64\u5916&#xff0c;\u8f85\u52a9\u6570\u7ec4\u6211\u4eec\u53ef\u4ee5\u76f4\u63a5\u8bbe\u7f6e\u4e3a\u6210\u5458\u53d8\u91cf<\/p>\n<p>class TCPServer<br \/>\n{<br \/>\npublic:<br \/>\n    const static int N &#061; sizeof(fd_set) * 8; \/\/\u8f85\u52a9\u6570\u7ec4\u7684\u5927\u5c0f<br \/>\n    const static int defaultfd &#061; -1; \/\/\u8f85\u52a9\u6570\u7ec4\u5143\u7d20\u7684\u521d\u59cb\u503c<br \/>\n    TCPServer(uint16_t port)<br \/>\n        : _port(port), _isrunning(false)<br \/>\n    {<br \/>\n        \/\/\u521d\u59cb\u5316\u8f85\u52a9\u6570\u7ec4<br \/>\n        for(int i &#061; 0 ; i &lt; N ; &#043;&#043;i)<br \/>\n        {<br \/>\n            fd_array[i] &#061; defaultfd;<br \/>\n        }<br \/>\n        \/\/listen\u5957\u63a5\u5b57\u662f\u5fc5\u987b\u8981\u7684&#xff0c;\u76f4\u63a5\u6dfb\u52a0\u8fdb\u8f85\u52a9\u6570\u7ec4<br \/>\n    }<br \/>\nprotected:<br \/>\n    uint16_t _port;<br \/>\n    int _listensock;<br \/>\n    bool _isrunning;<br \/>\n    int fd_array[N]; \/\/\u8f85\u52a9\u6570\u7ec4&#xff0c;\u5143\u7d20\u7684\u542b\u4e49\u662f\u9700\u8981\u5185\u6838\u5173\u5fc3\u7684\u5957\u63a5\u5b57\u7f16\u53f7<br \/>\n}; <\/p>\n<p>\u6ce8\u610f&#xff1a;\u8be5\u670d\u52a1\u5668\u7684listensock\u662f\u5728\u521d\u59cb\u5316\u5957\u63a5\u5b57\u65f6\u521b\u5efa\u7684&#xff0c;\u5728socket\u521b\u5efalistensock\u7684\u540e\u9762\u518d\u628alisten\u5957\u63a5\u5b57\u4f20\u5165\u5230\u8f85\u52a9\u6570\u7ec4\u4e2d\u00a0\u00a0<\/p>\n<hr \/>\n<p>handlerEvent\u7684\u5b9e\u73b0\u00a0<\/p>\n<p>\u901a\u8fc7\u4e4b\u524d\u4ecb\u7ecdselect\u8c03\u7528&#xff0c;\u6211\u4eec\u4f1a\u53d1\u73b0\u82e5\u6211\u4eec\u4e0d\u901a\u77e5\u5185\u6838\u9700\u8981\u5173\u5fc3\u67d0\u4e2afd&#xff0c;\u90a3\u4e48select\u8fd4\u56de\u65f6\u8fd9\u4e2afd\u4e00\u5b9a\u4e0d\u4f1a\u5728rfds\u4e2d\u3002<\/p>\n<ul>\n<li>\u82e5\u6211\u4eec\u544a\u8bc9\u5185\u6838\u9700\u8981\u5173\u5fc3\u7b2cn\u53f7\u6587\u4ef6\u63cf\u8ff0\u7b26&#xff0c;\u90a3\u4e48select\u8fd4\u56de\u65f6\u8be5\u6587\u4ef6\u63cf\u8ff0\u7b26\u4e0d\u4e00\u5b9a\u4f1a\u5c31\u7eea<\/li>\n<li>\u82e5\u6211\u4eec\u4e0d\u544a\u8bc9\u5185\u6838\u9700\u8981\u5173\u5fc3\u7b2cn\u53f7\u6587\u4ef6\u63cf\u8ff0\u7b26&#xff0c;\u90a3\u4e48select\u8fd4\u56de\u65f6\u8be5\u6587\u4ef6\u63cf\u8ff0\u7b26\u4e00\u5b9a\u4e0d\u4f1a\u5c31\u7eea<\/li>\n<\/ul>\n<p>\u9664\u6b64\u4e4b\u5916&#xff0c;select\u8fd4\u56de\u65f6&#xff0c;\u53ef\u80fd\u4e0d\u6b62\u4e00\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\u5c31\u7eea\u4e86<\/p>\n<p>\u6240\u4ee5\u7b2c\u4e00\u6b65\u6211\u4eec\u9700\u8981\u904d\u5386\u6574\u4e2a\u8f85\u52a9\u6570\u7ec4<\/p>\n<ul>\n<li>\u82e5\u904d\u5386\u8fc7\u7a0b\u4e2d&#xff0c;fd_array[i]\u7684\u503c\u662f\u9ed8\u8ba4\u503c&#xff0c;\u8bf4\u660e\u8be5\u4f4d\u7f6e\u8fd8\u6ca1\u88ab\u4f7f\u7528&#xff0c;\u76f4\u63a5\u8df3\u8fc7\u5373\u53ef<\/li>\n<li>\u82e5\u904d\u5386\u8fc7\u7a0b\u4e2d&#xff0c;fd_array[i]\u7684\u503c\u4e0d\u662f\u9ed8\u8ba4\u503c&#xff0c;\u610f\u5473\u7740\u8be5\u4f4d\u7f6e\u5b58\u50a8\u7684\u4e00\u5b9a\u662f\u9700\u8981\u5185\u6838\u5173\u5fc3\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u7f16\u53f7&#xff0c;\u6b64\u65f6\u9700\u8981\u770b\u8fd9\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\u662f\u5426\u5728\u8f93\u51fa\u578b\u53c2\u6570rfds\u4e2d&#xff0c;\u82e5\u5728&#xff0c;\u5219\u8be5\u6587\u4ef6\u63cf\u8ff0\u7b26\u5c31\u7eea\u3002\u5426\u5219&#xff0c;\u8be5\u6587\u4ef6\u63cf\u8ff0\u7b26\u6ca1\u5c31\u7eea<\/li>\n<li>\u5224\u65ad\u4e00\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\u662f\u5426\u5728fd_set\u4e2d&#xff0c;\u6211\u4eec\u4f7f\u7528\u7684\u8c03\u7528\u662fFD_SET\u00a0<\/li>\n<\/ul>\n<p>\u7b2c\u4e8c\u6b65\u5c31\u662f\u5206\u7c7b\u8ba8\u8bba&#xff0c;\u533a\u5206\u8be5\u5957\u63a5\u5b57\u662flisten\u5957\u63a5\u5b57\u8fd8\u662f\u666e\u901a\u5957\u63a5\u5b57<\/p>\n<p>    void handlerEvent(fd_set &amp;rfds)<br \/>\n    {<br \/>\n        for(int i &#061; 0 ; i &lt; N ; &#043;&#043;i)<br \/>\n        {<br \/>\n            \/\/\u82e5\u8be5fd\u4e0d\u5728\u8f85\u52a9\u6570\u7ec4\u4e2d&#xff0c;\u8bf4\u660e\u8be5\u6587\u4ef6\u63cf\u8ff0\u7b26\u4e00\u5b9a\u4e0d\u4f1a\u5c31\u7eea<br \/>\n            if(fd_array[i] &#061;&#061; defaultfd) continue;<br \/>\n            \/\/\u8d70\u5230\u8fd9&#xff0c;\u8bf4\u660e\u8be5\u6587\u4ef6\u63cf\u8ff0\u7b26\u88ab\u5173\u5fc3&#xff0c;\u7ecf\u8fc7rfds\u5224\u65ad\u662f\u5426\u5c31\u7eea<br \/>\n            if(!FD_ISSET(fd_array[i],&amp;rfds)) continue;<br \/>\n            \/\/\u533a\u5206\u5904\u7406<br \/>\n            if(fd_array[i] &#061;&#061; _listensock)<br \/>\n            {<br \/>\n                \/\/\u8be5\u5957\u63a5\u5b57\u662flisten\u5957\u63a5\u5b57&#xff0c;\u5b8c\u6210\u7684\u5de5\u4f5c\u662f\u5904\u7406\u8fde\u63a5<br \/>\n                AcceptClient();<br \/>\n            }<br \/>\n            else<br \/>\n            {<br \/>\n                \/\/\u8be5\u5957\u63a5\u5b57\u662f\u666e\u901a\u5957\u63a5\u5b57&#xff0c;\u5b8c\u6210\u7684\u5de5\u4f5c\u662f\u63d0\u4f9bI\/O\u670d\u52a1<br \/>\n                Service(fd_array[i]);<br \/>\n            }<br \/>\n        }<br \/>\n    } <\/p>\n<hr \/>\n<p>\u5904\u7406\u8fde\u63a5&#xff1a;AcceptClient\u00a0<\/p>\n<p>\u00a0\u5230\u8fd9\u4e00\u6b65&#xff0c;\u8bf4\u660elisten\u5957\u63a5\u5b57\u7684\u8bfb\u4e8b\u4ef6\u5df2\u7ecf\u5c31\u7eea<\/p>\n<p>\u9700\u8981\u8fdb\u884c\u4e24\u6b65\u64cd\u4f5c&#xff1a;<\/p>\n<ul>\n<li>\u83b7\u53d6\u65b0\u8fde\u63a5&#xff0c;\u5e76\u83b7\u53d6\u65b0\u7684\u5957\u63a5\u5b57<\/li>\n<li>\u628a\u5957\u63a5\u5b57\u4ea4\u7ed9select\u8fdb\u884c\u76d1\u7ba1<\/li>\n<\/ul>\n<p>\u5982\u4f55\u4ea4\u7ed9select\u8fdb\u884c\u76d1\u7ba1&#xff1f;\u628a\u8fd9\u4e2a\u65b0\u7684\u5957\u63a5\u5b57\u8bbe\u7f6e\u8fdb\u8f85\u52a9\u6570\u7ec4\u5373\u53ef<\/p>\n<p>    void AcceptClient()<br \/>\n    {<br \/>\n        \/\/1.\u83b7\u53d6\u65b0\u8fde\u63a5&#xff0c;\u83b7\u53d6\u65b0\u7684\u5957\u63a5\u5b57<br \/>\n        int sockfd;<br \/>\n        Accept(sockfd);<br \/>\n        \/\/2.\u628a\u65b0\u8fde\u63a5\u8bbe\u7f6e\u8fdb\u8f85\u52a9\u6570\u7ec4<br \/>\n        int pos &#061; 1;<br \/>\n        for(; pos &lt; N ; &#043;&#043;pos)<br \/>\n        {<br \/>\n            \/\/2.1\u9009\u62e9\u4e00\u4e2a\u6ca1\u88ab\u7528\u8fc7\u7684\u4f4d\u7f6e<br \/>\n            if(fd_array[pos] &#061;&#061; defaultfd) break;<br \/>\n        }<br \/>\n        if(pos &lt; N)<br \/>\n        {<br \/>\n            \/\/2.2\u627e\u5230\u4e86\u4e00\u4e2a\u6ca1\u6709\u88ab\u7528\u7684\u7a7a\u4f4d\u7f6e<br \/>\n            fd_array[pos] &#061; sockfd;<br \/>\n        }<br \/>\n        else<br \/>\n        {<br \/>\n            \/\/pos &#061;&#061; N<br \/>\n            \/\/2.3\u8bf4\u660efd_array\u5df2\u7ecf\u88ab\u4f7f\u7528\u6ee1\u4e86<br \/>\n            close(sockfd);<br \/>\n            std::cerr &lt;&lt; &#034;Server is full!&#034; &lt;&lt; std::endl;<br \/>\n        }<br \/>\n    } <\/p>\n<hr \/>\n<p>\u00a0\u63d0\u4f9b\u670d\u52a1&#xff1a;Service<\/p>\n<p>Service\u6ce8\u610f\u4e0d\u8981\u6b7b\u5faa\u73af\u5373\u53ef&#xff01;\u00a0<\/p>\n<p>    void Service(int sockfd)<br \/>\n    {<br \/>\n            \/\/\u83b7\u53d6\u5ba2\u6237\u7aef\u7684\u8f93\u5165<br \/>\n            char buffer[1024];<br \/>\n            int n &#061; recv(sockfd, buffer, sizeof(buffer), MSG_WAITALL);<br \/>\n            if (n &gt; 0)<br \/>\n            {<br \/>\n                \/\/ \u63a5\u6536\u6210\u529f<br \/>\n                std::cout &lt;&lt; &#034;Client say# &#034; &lt;&lt; buffer &lt;&lt; std::endl;<br \/>\n                \/\/ \u670d\u52a1\u5668\u628abuffer\u4e2d\u7684\u6570\u636e\u91cd\u65b0\u53d1\u9001\u7ed9\u5ba2\u6237\u7aef&#xff0c;\u5b8c\u6210\u670d\u52a1<\/p>\n<p>                \/\/\u53d1\u9001\u5ba2\u6237\u7aef\u7684\u8f93\u5165<br \/>\n                send(sockfd, buffer, sizeof(buffer), 0);<br \/>\n            }<br \/>\n            else if (n &#061;&#061; 0)<br \/>\n            {<br \/>\n                \/\/ \u5ba2\u6237\u7aef\u5957\u63a5\u5b57\u5173\u95ed<br \/>\n                std::cout &lt;&lt; &#034;client socket close!&#034; &lt;&lt; std::endl;<br \/>\n                close(sockfd);<br \/>\n            }<br \/>\n            else<br \/>\n            {<br \/>\n                \/\/ recv error<br \/>\n                std::cerr &lt;&lt; &#034;recv error!&#034; &lt;&lt; std::endl;<br \/>\n                close(sockfd);<br \/>\n                exit(5);<br \/>\n            }<br \/>\n    } <\/p>\n<hr \/>\n<p>\u4fee\u6539Loop\u51fd\u6570<\/p>\n<p>Loop\u51fd\u6570\u7684\u4fee\u6539\u4e3b\u8981\u6709\u51e0\u70b9\u00a0<\/p>\n<ul>\n<li>\u5148\u628alisten\u5957\u63a5\u5b57\u653e\u5165\u8f85\u52a9\u6570\u7ec4<\/li>\n<li>\u6bcf\u4e00\u6b21\u5faa\u73af\u90fd\u5f97\u904d\u5386\u4e00\u904d\u8f85\u52a9\u6570\u7ec4&#xff0c;\u6784\u5efafd_set\u8f93\u5165\u578b\u53c2\u6570&#xff0c;\u7528\u4e8e\u4f20\u9012select\u53c2\u6570<\/li>\n<li>\u904d\u5386\u8fc7\u7a0b\u4e2d\u627e\u51fa\u6700\u5927\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26&#xff0c;\u7528\u4e8e\u4f20\u9012select\u53c2\u6570<\/li>\n<\/ul>\n<p>    void Loop() \/\/ \u4fee\u6539I\/O\u4e3aselect<br \/>\n    {<br \/>\n        fd_array[0] &#061; _listensock;<br \/>\n        while(true)\/\/\u9700\u8981\u4e0d\u65ad\u83b7\u53d6\u8fde\u63a5&#xff0c;\u6253\u4e0a\u6b7b\u5faa\u73af\u5373\u53ef<br \/>\n        {<br \/>\n            \/\/\u5b9a\u4e49fd_set<br \/>\n            fd_set rfds;<br \/>\n            \/\/\u586b\u5145fd_set<br \/>\n            FD_ZERO(&amp;rfds);<br \/>\n            \/\/max_fd\u4e3b\u8981\u7528\u4e8eselect\u53c2\u6570\u586b\u5199<br \/>\n            int max_fd &#061; defaultfd;<br \/>\n            for(size_t i &#061; 0 ; i &lt; N ; &#043;&#043;i)<br \/>\n            {<br \/>\n                if(fd_array[i] &#061;&#061; defaultfd) continue;<br \/>\n                FD_SET(fd_array[i],&amp;rfds);<\/p>\n<p>                if(fd_array[i] &gt; max_fd) max_fd &#061; fd_array[i];<br \/>\n            }<br \/>\n            \/\/\u8c03\u7528select<br \/>\n            int n &#061; select(max_fd &#043; 1 , &amp;rfds,nullptr,nullptr,nullptr);\/\/select\u53ea\u5173\u5fc3\u8bfb\u4e8b\u4ef6&#xff0c;\u5e76\u4e14\u963b\u585e\u7b49\u5f85<br \/>\n            if(n &gt; 0)<br \/>\n            {<\/p>\n<p>                \/\/\u8868\u793a\u5df2\u7ecf\u6709\u6587\u4ef6\u63cf\u8ff0\u7b26\u6761\u4ef6\u5c31\u7eea\u4e86&#xff0c;\u6b64\u65f6rfds\u4e2d\u6bd4\u7279\u4f4d\u4e3a1\u7684\u4f4d\u7f6e\u5c31\u662f\u5df2\u7ecf\u5c31\u7eea\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26<br \/>\n                handlerEvent(rfds);<br \/>\n            }<br \/>\n            else if(n &#061;&#061; 0)<br \/>\n            {<br \/>\n                \/\/\u963b\u585e\u7b49\u5f85\u4e0d\u4f1a\u8d70\u5230\u8fd9<br \/>\n                std::cout &lt;&lt; &#034;timeout&#8230;&#034; &lt;&lt; std::endl;<br \/>\n                continue;<br \/>\n            }<br \/>\n            else<br \/>\n            {<br \/>\n                std::cerr &lt;&lt; &#034;Select Error!&#034; &lt;&lt; std::endl;<br \/>\n                continue;<br \/>\n            }<br \/>\n        }<br \/>\n    } <\/p>\n<hr \/>\n<h3 id=\"select%E6%9C%8D%E5%8A%A1%E5%99%A8%E4%BB%A3%E7%A0%81%E9%93%BE%E6%8E%A5%C2%A0\">select\u670d\u52a1\u5668\u4ee3\u7801\u94fe\u63a5\u00a0<\/h3>\n<p>select\u670d\u52a1\u5668\u5b9e\u73b0<\/p>\n<hr \/>\n<h2 id=\"select%E7%9A%84%E4%BC%98%E7%BC%BA%E7%82%B9%C2%A0\">select\u7684\u4f18\u7f3a\u70b9\u00a0<\/h2>\n<p>\u4f18\u70b9&#xff1a;<\/p>\n<ul>\n<li>\u4e0e\u5176\u4ed6I\/O\u6a21\u578b\u76f8\u6bd4&#xff0c;select\u53ef\u4ee5\u540c\u65f6\u7b49\u5f85\u591a\u4e2afd\u3002\u5bf9I\/O\u6027\u80fd\u6709\u7740\u663e\u8457\u63d0\u5347<\/li>\n<li>select\u662f\u6700\u65e9\u51fa\u73b0\u7684\u591a\u8def\u8f6c\u63a5\u7684\u65b9\u6848&#xff0c;\u5728\u5f88\u591a\u8f83\u65e7\u7684\u670d\u52a1\u5668\u6216\u7cfb\u7edf\u4e0a&#xff0c;select\u4ecd\u7136\u4f1a\u88ab\u4f7f\u7528\u00a0<\/li>\n<\/ul>\n<p>\u7f3a\u70b9&#xff1a;<\/p>\n<ul>\n<li>\u540c\u65f6\u7b49\u5f85\u7684fd\u7684\u4e2a\u6570&#xff0c;\u6709\u4e0a\u9650\u3002\u8fd9\u4e00\u7f3a\u70b9\u662f\u7531\u4e8efd_set\u7c7b\u578b\u88ab\u8bbe\u7f6e\u4e3a\u56fa\u5b9a\u5927\u5c0f\u7684\u4f4d\u56fe\u3002\u901a\u5e38\u4e3a1024\u4e2a\u6bd4\u7279\u4f4d<\/li>\n<li>select\u8f93\u5165\u8f93\u51fa\u53c2\u6570\u6df7\u5408\u3002\u6bcf\u6b21\u90fd\u8981\u8fdb\u884c\u91cd\u65b0\u8bbe\u5b9a\u3002\u901a\u8fc7\u670d\u52a1\u5668\u7684\u7f16\u5199\u6211\u4eec\u4f1a\u53d1\u73b0&#xff0c;\u4f7f\u7528select\u5f80\u5f80\u4f1a\u9020\u6210\u5927\u8303\u56f4\u7684\u904d\u5386&#xff0c;\u800c\u904d\u5386\u5bf9\u6027\u80fd\u7684\u635f\u8017\u5176\u5b9e\u4e5f\u662f\u86ee\u5927\u7684<\/li>\n<li>\u5185\u6838\u548c\u7528\u6237\u4e4b\u95f4\u7684\u6570\u636e\u62f7\u8d1d&#xff0c;\u8fd9\u4e2a\u7f3a\u70b9\u6240\u6709\u7684\u591a\u8def\u8f6c\u63a5\u65b9\u6848\u90fd\u4f1a\u5b58\u5728<\/li>\n<li>select\u5e95\u5c42\u76d1\u89c6\u591a\u4e2afd\u7684\u65f6\u5019&#xff0c;OS\u4f1a\u5728\u5185\u90e8\u8fdb\u884c\u904d\u5386\u68c0\u6d4b\u6240\u6709\u7684fd&#xff0c;\u81f3\u5c11\u6709\u4e00\u4e2a\u5c31\u7eea\u5c31\u8fd4\u56de\u3002\u5982\u679c\u6ca1\u6709&#xff0c;\u5c31\u6309\u7167\u7b56\u7565&#xff01;<\/li>\n<\/ul>\n<p>\u7531\u4e8eselect\u7684\u7f3a\u70b9\u6bd4\u8f83\u591a&#xff0c;\u6240\u6709\u540e\u6765\u63d0\u51fa\u7684\u591a\u8def\u8f6c\u63a5\u65b9\u6848\u90fd\u662f\u57fa\u4e8e\u8fd9\u4e9b\u7f3a\u70b9\u8fdb\u884c\u7684\u6539\u826f\u3002<\/p>\n<p>\u5176\u4e2d&#xff0c;\u6211\u4eec\u63a5\u4e0b\u6765\u4ecb\u7ecd\u7684poll\u5c31\u5bf9select\u7684\u67d0\u4e9b\u7f3a\u70b9\u8fdb\u884c\u4e86\u6539\u826f\u00a0<\/p>\n<hr \/>\n<h2 id=\"%E5%A4%9A%E8%B7%AF%E8%BD%AC%E6%8E%A5%E4%B9%8Bpoll%C2%A0\">\u591a\u8def\u8f6c\u63a5\u4e4bpoll\u00a0<\/h2>\n<p>poll\u5bf9select\u8fdb\u884c\u4e00\u5b9a\u7a0b\u5ea6\u7684\u6539\u826f<\/p>\n<ul>\n<li>poll\u89e3\u51b3\u4e86select\u540c\u65f6\u7b49\u5f85fd\u6709\u4e0a\u9650\u7684\u95ee\u9898<\/li>\n<li>poll\u89e3\u51b3\u4e86select\u8f93\u5165\u8f93\u51fa\u6df7\u5408&#xff0c;\u5bfc\u81f4\u4ee3\u7801\u4e2d\u51fa\u73b0\u591a\u6b21\u904d\u5386\u7684\u95ee\u9898<\/li>\n<\/ul>\n<hr \/>\n<p>poll\u63a5\u53e3\u00a0<\/p>\n<p>       #include &lt;poll.h&gt;<\/p>\n<p>       int poll(struct pollfd *fds, nfds_t nfds, int timeout); <\/p>\n<ul>\n<li>timeout&#xff1a;poll\u7684timeout\u662f\u8f93\u5165\u578b\u53c2\u6570&#xff0c;poll\u7b49\u5f85\u65f6\u6309\u7167timeout\u7684\u7b56\u7565\u8fdb\u884c\u7b49\u5f85&#xff0c;\u53ef\u4ee5\u7c7b\u6bd4select\u7684timeout\u53c2\u6570&#xff0c;poll\u7684timeout\u7684\u5355\u4f4d\u662fms(\u6beb\u79d2)&#xff0c;\u82e5poll\u5728\u7b49\u5f85\u4e86timeout\u6beb\u79d2\u540e\u8fd8\u6ca1\u6709\u4efb\u4f55fd\u5c31\u7eea&#xff0c;\u90a3\u4e48poll\u4f1a\u8d85\u65f6\u8fd4\u56de\u3002\u7279\u6b8a\u7684&#xff1a;\u82e5timeout\u88ab\u8bbe\u7f6e\u4e3a0\u5219\u8868\u793a\u975e\u963b\u585e\u7b49\u5f85\u3002\u82e5timeout\u88ab\u8bbe\u7f6e\u4e3a-1\u5219\u8868\u793a\u963b\u585e\u7b49\u5f85<\/li>\n<li>fds\u548cnfds&#xff1a;\u8fd9\u4e24\u4e2a\u5408\u8d77\u6765\u6211\u4eec\u53ef\u4ee5\u770b\u6210\u662f\u4e00\u4e2a\u6570\u7ec4&#xff0c;\u5176\u4e2dnfds\u8868\u793a\u7684\u662f\u6570\u7ec4\u7684\u5143\u7d20\u4e2a\u6570&#xff0c;\u800cfds\u8868\u793a\u6570\u7ec4\u7684\u9996\u5143\u7d20\u5730\u5740\u3002\u6570\u7ec4\u7684\u5143\u7d20\u7c7b\u578b\u662fstruct pollfd\u3002<\/li>\n<\/ul>\n<hr \/>\n<p>poll\u5982\u4f55\u89e3\u51b3select\u8f93\u5165\u8f93\u51fa\u53c2\u6570\u6df7\u5408\u7684\u95ee\u9898\u7684&#xff1f;\u00a0<\/p>\n<p>\u00a0poll\u7684fds\u5b9e\u9645\u4e0a\u4e5f\u662f\u4e00\u4e2a\u8f93\u5165\u4e14\u8f93\u51fa\u578b\u53c2\u6570&#xff01;<\/p>\n<p>struct pollfd\u7ed3\u6784&#xff1a;<\/p>\n<p>           struct pollfd {<br \/>\n               int   fd;         \/* file descriptor *\/<br \/>\n               short events;     \/* requested events *\/<br \/>\n               short revents;    \/* returned events *\/<br \/>\n           }; <\/p>\n<ul>\n<li>fd&#xff1a;\u8868\u793a\u9700\u8981\u5173\u5fc3\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u7f16\u53f7<\/li>\n<li>events&#xff1a;\u8bf7\u6c42\u4e8b\u4ef6&#xff0c;\u8fd9\u662f\u7528\u4e8e\u7528\u6237\u544a\u8bc9\u5185\u6838\u9700\u8981\u5173\u5fc3fd\u7684\u54ea\u4e9b\u4e8b\u4ef6&#xff0c;\u82e5\u8fd9\u4e2a\u53c2\u6570\u7528\u6237\u8bbe\u7f6e\u4e3aPOLLIN&#xff0c;\u5219\u8868\u793a\u9700\u8981\u5173\u5fc3fd\u7684\u8bfb\u4e8b\u4ef6\u3002\u82e5\u8fd9\u4e2a\u53c2\u6570\u7528\u6237\u8bbe\u7f6e\u4e3aPOLLOUT&#xff0c;\u5219\u8868\u793a\u9700\u8981\u5173\u5fc3fd\u7684\u5199\u4e8b\u4ef6\u3002\u82e5\u7528\u6237\u65e2\u60f3\u5173\u5fc3\u8bfb&#xff0c;\u53c8\u60f3\u5173\u5fc3\u5199&#xff0c;\u5219\u00a0POLLOUT | POLLIN\u5373\u53ef&#xff0c;\u4e5f\u5c31\u662f\u8bf4\u53c2\u6570\u53ef\u4ee5\u8fdb\u884c\u7ec4\u5408<\/li>\n<li>revents&#xff1a;\u8fd4\u56de\u4e8b\u4ef6&#xff0c;\u8fd9\u662f\u5185\u6838\u544a\u8bc9\u7528\u6237&#xff0c;\u6307\u5b9afd\u7684\u54ea\u4e9b\u4e8b\u4ef6\u597d\u4e86&#xff01;\u82e5\u7528\u6237\u60f3\u770b\u770b\u8be5fd\u7684\u8bfb\u4e8b\u4ef6\u662f\u5426\u5c31\u7eea&#xff0c;\u5219revents &amp; POLLIN\u5373\u53ef&#xff01;<\/li>\n<\/ul>\n<p>poll\u7684\u4e8b\u4ef6\u9664\u4e86\u8bfb\u5199\u4ee5\u5916\u8fd8\u6709\u54ea\u4e9b&#xff1a;&#xff08;man\u624b\u518c\u6709\u8be6\u7ec6\u4ecb\u7ecd&#xff09;\u00a0<\/p>\n<ul>\n<li><img loading=\"lazy\" decoding=\"async\" alt=\"\" height=\"749\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250418160712-680278b06f19a.png\" width=\"1200\" \/><\/li>\n<\/ul>\n<p>\u6211\u4eec\u53ef\u4ee5\u770b\u51fa&#xff0c;poll\u7684fds\u53c2\u6570\u867d\u7136\u8fd8\u662f\u8f93\u5165\u8f93\u51fa\u578b\u7684\u53c2\u6570&#xff0c;\u4f46\u7528\u6237\u901a\u77e5\u5185\u6838\u548c\u5185\u6838\u901a\u77e5\u7528\u6237\u6240\u7528\u7684\u53d8\u91cf\u4e0d\u518d\u662f\u540c\u4e00\u4e2a&#xff0c;\u8fd9\u5c31\u662fpoll\u89e3\u51b3\u8f93\u5165\u8f93\u51fa\u6df7\u5408\u95ee\u9898\u7684\u65b9\u6848\u00a0<\/p>\n<hr \/>\n<p>poll\u5982\u4f55\u89e3\u51b3select\u540c\u65f6\u7b49\u5f85\u7684fd\u6709\u4e0a\u9650\u7684\u95ee\u9898&#xff1f;\u00a0<\/p>\n<p>\u4ece\u53c2\u6570\u4e0a&#xff0c;\u6211\u4eec\u5df2\u7ecf\u53ef\u4ee5\u731c\u5230\u5b83\u7684\u89e3\u51b3\u65b9\u6848\u4e86<\/p>\n<p>poll\u7684fds\u53c2\u6570\u548cnfds\u53c2\u6570\u662f\u914d\u5408\u4f7f\u7528\u7684&#xff0c;fds\u76f8\u5f53\u4e8e\u6570\u636e\u9996\u5143\u7d20\u5730\u5740&#xff0c;nfds\u662f\u7531\u7528\u6237\u786e\u5b9a\u7684&#xff0c;\u6362\u53e5\u8bdd\u6765\u8bf4&#xff0c;\u53ea\u8981\u7528\u6237\u60f3\u4e14\u5185\u5b58\u5141\u8bb8&#xff0c;\u4f60\u7684fd\u60f3\u8981\u591a\u5c11\u5c31\u6709\u591a\u5c11&#xff01;\u4e0d\u4f1a\u53d7\u5230poll\u63a5\u53e3\u7684\u5f71\u54cd<\/p>\n<hr \/>\n<h2 id=\"poll%E6%9C%8D%E5%8A%A1%E5%99%A8%E5%AE%9E%E7%8E%B0(select%E6%9C%8D%E5%8A%A1%E5%99%A8%E6%94%B9%E5%86%99)%C2%A0\">poll\u670d\u52a1\u5668\u5b9e\u73b0(select\u670d\u52a1\u5668\u6539\u5199)\u00a0<\/h2>\n<p>\u7ecf\u8fc7select\u670d\u52a1\u5668\u7684\u94fa\u57ab&#xff0c;poll\u670d\u52a1\u5668\u6539\u5199\u8d77\u6765\u662f\u76f8\u5bf9\u5bb9\u6613\u7684&#xff1a;poll\u670d\u52a1\u5668\u7684\u6539\u5199\u4ee3\u7801<\/p>\n<hr \/>\n<h2 id=\"poll%E7%9A%84%E4%BC%98%E7%BC%BA%E7%82%B9\">poll\u7684\u4f18\u7f3a\u70b9<\/h2>\n<p>\u4f18\u70b9&#xff1a;<\/p>\n<ul>\n<li>poll\u5728select\u7684\u57fa\u7840\u4e0a&#xff0c;\u5f25\u8865\u4e86select\u7684\u4e00\u4e9b\u7f3a\u70b9\u3002\u5e76\u4e14poll\u4e5f\u662f\u591a\u8def\u8f6c\u63a5\u65b9\u6848\u7684\u4e00\u79cd&#xff0c;\u4e0e\u5176\u4ed6\u56db\u79cdI\/O\u6a21\u578b\u76f8\u6bd4&#xff0c;poll\u7684\u4f18\u70b9\u662f\u5b83\u53ef\u4ee5\u540c\u65f6\u63a5\u6536\u591a\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26<\/li>\n<li>poll\u5728select\u7684\u57fa\u7840\u4e0a&#xff0c;\u5f25\u8865\u4e86select\u540c\u65f6\u7b49\u5f85\u7684fd\u6709\u4e0a\u9650\u7684\u95ee\u9898&#xff0c;poll\u5219\u662f\u5b8c\u5168\u7531\u7528\u6237\u81ea\u4e3b\u51b3\u5b9afd\u7684\u5927\u5c0f\u3002<\/li>\n<li>poll\u5728select\u7684\u57fa\u7840\u4e0a&#xff0c;\u5f25\u8865\u4e86select\u8f93\u5165\u8f93\u51fa\u53c2\u6570\u6df7\u5408\u7684\u95ee\u9898&#xff0c;\u6bcf\u6b21\u8c03\u7528poll\u65f6&#xff0c;\u90fd\u4e0d\u518d\u9700\u8981\u91cd\u65b0\u904d\u5386\u8bbe\u5b9a\u53c2\u6570&#xff01;<\/li>\n<\/ul>\n<p>\u7f3a\u70b9&#xff1a;<\/p>\n<ul>\n<li>poll\u4e0e\u6211\u4eec\u540e\u7eed\u6240\u5b66\u4e60\u7684epoll\u76f8\u6bd4&#xff0c;\u5b83\u7684\u7f3a\u70b9\u662f\u5e95\u5c42poll\u5728\u68c0\u67e5fd\u662f\u5426\u5c31\u7eea\u65f6&#xff0c;\u4ecd\u7136\u91c7\u7528\u7684\u662f\u904d\u5386\u6574\u4e2afd\u6570\u7ec4\u7684\u65b9\u5f0f&#xff0c;\u6548\u7387\u8f83\u4f4e<\/li>\n<li>poll\u867d\u7136\u6bd4\u8d77select\u6765\u8bf4\u8f83\u4f18&#xff0c;\u4f46\u7531\u4e8e\u5176\u51fa\u73b0\u7684\u65f6\u95f4\u70b9\u548c\u6280\u672f\u53d1\u5c55\u7684\u8d8b\u52bf&#xff0c;\u5927\u591a\u6570\u65e7\u7684\u8bbe\u5907\/\u670d\u52a1\u5668\u5f53\u4e2d&#xff0c;\u90fd\u5df2\u7ecf\u91c7\u7528\u4e86select\u3002\u800c\u5bf9\u4e8e\u65b0\u7684\u8bbe\u5907\/\u670d\u52a1\u5668\u6765\u8bf4&#xff0c;poll\u88abepoll\u6240\u66ff\u4ee3\u3002\u6240\u4ee5poll\u6240\u5904\u7684\u5730\u4f4d\u8f83\u4e3a\u5c34\u5c2c<\/li>\n<li>\u5185\u6838\u548c\u7528\u6237\u4e4b\u95f4\u7684\u6570\u636e\u62f7\u8d1d&#xff0c;\u8fd9\u4e2a\u7f3a\u70b9\u6240\u6709\u7684\u591a\u8def\u8f6c\u63a5\u65b9\u6848\u90fd\u4f1a\u5b58\u5728<\/li>\n<\/ul><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6587\u7ae0\u6d4f\u89c8\u9605\u8bfb924\u6b21\uff0c\u70b9\u8d5e11\u6b21\uff0c\u6536\u85cf27\u6b21\u3002poll\u7684fds\u53c2\u6570\u548cnfds\u53c2\u6570\u662f\u914d\u5408\u4f7f\u7528\u7684\uff0cfds\u76f8\u5f53\u4e8e\u6570\u636e\u9996\u5143\u7d20\u5730\u5740\uff0cnfds\u662f\u7531\u7528\u6237\u786e\u5b9a\u7684\uff0c\u6362\u53e5\u8bdd\u6765\u8bf4\uff0c\u53ea\u8981\u7528\u6237\u60f3\u4e14\u5185\u5b58\u5141\u8bb8\uff0c\u4f60\u7684fd\u60f3\u8981\u591a\u5c11\u5c31\u6709\u591a\u5c11\uff01\u6211\u4eec\u53ef\u4ee5\u770b\u51fa\uff0cpoll\u7684fds\u53c2\u6570\u867d\u7136\u8fd8\u662f\u8f93\u5165\u8f93\u51fa\u578b\u7684\u53c2\u6570\uff0c\u4f46\u7528\u6237\u901a\u77e5\u5185\u6838\u548c\u5185\u6838\u901a\u77e5\u7528\u6237\u6240\u7528\u7684\u53d8\u91cf\u4e0d\u518d\u662f\u540c\u4e00\u4e2a\uff0c\u8fd9\u5c31\u662fpoll\u89e3\u51b3\u8f93\u5165\u8f93\u51fa\u6df7\u5408\u95ee\u9898\u7684\u65b9\u6848\u3002select\u5b8c\u6210\u7684\u5de5\u4f5c\u5c31\u662fI\/O\u7b49\u5f85\u8fd9\u4e00\u6b65\uff0c\u5373\u5bf9\u591a\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\u8fdb\u884c\u7b49\u5f85\uff0c\u82e5\u6709\u4e00\u4e2a\u6216\u591a\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\u8bfb\u5199\u6761\u4ef6\u5c31\u7eea\uff0cselect\u5c31\u4f1a\u8fd4\u56de\uff01select\u8fd4\u56de\u540e\uff0c\u5373\u8fdb\u884c\u591a\u8def\u590d\u7528\u7684\u7b2c\u4e8c\u6b65\u62f7\u8d1d\u3002<\/p>\n","protected":false},"author":2,"featured_media":17588,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[58,192,43,78,1324],"topic":[],"class_list":{"0":"post-17591","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","6":"hentry","7":"category-server","8":"tag-linux","10":"tag-43","11":"tag-78","12":"tag-i-o"},"yoast_head":"<!-- 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