{"id":83769,"date":"2026-07-26T04:25:38","date_gmt":"2026-07-25T20:25:38","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/83769.html"},"modified":"2026-07-26T04:25:38","modified_gmt":"2026-07-25T20:25:38","slug":"%e3%80%90linux%e7%bd%91%e7%bb%9c%e3%80%91%e6%b7%b1%e5%85%a5%e7%90%86%e8%a7%a3linux-io%e5%a4%9a%e8%b7%af%e5%a4%8d%e7%94%a8%ef%bc%9a%e4%bb%8e%e6%9c%ac%e8%b4%a8%e5%88%b0select%e6%9c%8d%e5%8a%a1%e5%99%a8","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/83769.html","title":{"rendered":"\u3010Linux\u7f51\u7edc\u3011\u6df1\u5165\u7406\u89e3Linux IO\u591a\u8def\u590d\u7528\uff1a\u4ece\u672c\u8d28\u5230select\u670d\u52a1\u5668\u5b9e\u6218"},"content":{"rendered":"

\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"<\/p>\n

🔥\u8349\u8393\u718aLotso：\u4e2a\u4eba\u4e3b\u9875 <\/font><\/p>\n

\u2744\ufe0f\u4e2a\u4eba\u4e13\u680f: \u300aC++\u77e5\u8bc6\u5206\u4eab\u300b \u300aLinux \u5165\u95e8\u5230\u5b9e\u8df5：\u96f6\u57fa\u7840\u4e5f\u80fd\u61c2\u300b <\/font><\/p>\n

\u2728\u751f\u6d3b\u662f\u9ed8\u9ed8\u7684\u575a\u6301，\u6bc5\u529b\u662f\u6c38\u4e45\u7684\u4eab\u53d7！<\/font> <\/p>\n

\n

🎬 \u535a\u4e3b\u7b80\u4ecb：<\/font><\/p>\n

\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"<\/p>\n

\n

\u6587\u7ae0\u76ee\u5f55<\/h4>\n
    \n
  • \u524d\u8a00<\/li>\n
  • \u4e00. \u591a\u8def\u8f6c\u63a5\u7684\u672c\u8d28：\u628a "\u7b49" \u548c "\u62f7\u8d1d" \u5206\u5f00<\/li>\n
  • \n
      \n
    • 1.1 \u4ec0\u4e48\u662f "\u6761\u4ef6\u5c31\u7eea"<\/li>\n
    • 1.2 \u5e38\u89c1\u591a\u8def\u590d\u7528\u65b9\u6848\u5bf9\u6bd4<\/li>\n<\/ul>\n<\/li>\n
    • \u4e8c. select \u51fd\u6570\u8be6\u89e3<\/li>\n
    • \n
        \n
      • 2.1 \u53c2\u6570\u8be6\u89e3<\/li>\n
      • 2.2 \u8fd4\u56de\u503c<\/li>\n<\/ul>\n<\/li>\n
      • \u4e09. socket \u5c31\u7eea\u6761\u4ef6\u8be6\u89e3<\/li>\n
      • \n
          \n
        • 3.1 \u8bfb\u5c31\u7eea<\/li>\n
        • 3.2 \u5199\u5c31\u7eea<\/li>\n
        • 3.3 \u5f02\u5e38\u5c31\u7eea（\u9009\u5b66）<\/li>\n<\/ul>\n<\/li>\n
        • \u56db. select \u7684\u7f16\u7a0b\u7279\u70b9\u4e0e\u7f3a\u70b9<\/li>\n
        • \n
            \n
          • 4.1 select \u7684\u7f16\u7a0b\u7279\u70b9<\/li>\n
          • 4.2 select \u7684\u7f3a\u70b9<\/li>\n<\/ul>\n<\/li>\n
          • \u4e94. \u5b9e\u6218：\u4ece\u96f6\u5b9e\u73b0 select \u670d\u52a1\u5668<\/li>\n
          • \n
              \n
            • 5.1 \u57fa\u7840\u7ec4\u4ef6\u56de\u987e<\/li>\n
            • 5.2 select \u670d\u52a1\u5668\u6838\u5fc3\u5b9e\u73b0<\/li>\n
            • 5.3 \u4e3b\u51fd\u6570<\/li>\n
            • 5.4 \u4ee3\u7801\u89e3\u8bfb<\/li>\n
            • 5.5 \u7f16\u8bd1\u8fd0\u884c<\/li>\n<\/ul>\n<\/li>\n
            • \u7ed3\u5c3e：<\/li>\n<\/ul>\n
              \n

              \u524d\u8a00<\/h2>\n

              \u5728\u4e0a\u4e00\u7bc7\u6587\u7ae0\u4e2d，\u6211\u4eec\u8be6\u7ec6\u8bb2\u89e3\u4e86 Linux \u4e0b\u7684\u4e94\u79cd IO \u6a21\u578b，\u5176\u4e2dIO \u591a\u8def\u590d\u7528\u662f\u76ee\u524d\u9ad8\u5e76\u53d1\u670d\u52a1\u5668\u7684\u57fa\u77f3\u3002\u5b83\u7528\u4e00\u4e2a\u7ebf\u7a0b\u5c31\u80fd\u540c\u65f6\u5904\u7406\u6210\u767e\u4e0a\u5343\u4e2a\u8fde\u63a5，\u5f7b\u5e95\u89e3\u51b3\u4e86\u963b\u585e IO"\u4e00\u4e2a\u8fde\u63a5\u4e00\u4e2a\u7ebf\u7a0b" \u7684\u6027\u80fd\u74f6\u9888\u3002\u800cselect，\u4f5c\u4e3a Linux \u7cfb\u7edf\u4e0a\u7b2c\u4e00\u4e2a\u5b9e\u73b0 IO \u591a\u8def\u590d\u7528\u7684\u7cfb\u7edf\u8c03\u7528，\u867d\u7136\u73b0\u5728\u5df2\u7ecf\u9010\u6e10\u88ab\u66f4\u9ad8\u6548\u7684epoll\u53d6\u4ee3，\u4f46\u5b83\u662f\u7406\u89e3\u6240\u6709\u591a\u8def\u590d\u7528\u6280\u672f\u7684\u57fa\u7840\u3002\u51e0\u4e4e\u6240\u6709\u64cd\u4f5c\u7cfb\u7edf\u90fd\u5b9e\u73b0\u4e86select\u63a5\u53e3，\u638c\u63e1\u5b83\u4e0d\u4ec5\u80fd\u5e2e\u4f60\u7406\u89e3\u591a\u8def\u590d\u7528\u7684\u6838\u5fc3\u601d\u60f3，\u4e5f\u662f\u9762\u8bd5\u4e2d\u7ed5\u4e0d\u5f00\u7684\u8003\u70b9\u3002\u672c\u6587\u5c06\u4ece\u6700\u5e95\u5c42\u7684\u591a\u8def\u8f6c\u63a5\u672c\u8d28\u8bb2\u8d77，\u5e26\u4f60\u5f7b\u5e95\u641e\u61c2select\u51fd\u6570\u7684\u6bcf\u4e00\u4e2a\u53c2\u6570，\u6700\u540e\u901a\u8fc7\u5b9e\u6218\u4ee3\u7801\u4ece\u96f6\u5b9e\u73b0\u4e00\u4e2a\u57fa\u4e8eselect\u7684 TCP \u670d\u52a1\u5668\u3002<\/p>\n

              \"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"<\/p>\n

              \n

              \u4e00. \u591a\u8def\u8f6c\u63a5\u7684\u672c\u8d28：\u628a \u201c\u7b49\u201d \u548c \u201c\u62f7\u8d1d\u201d \u5206\u5f00<\/h2>\n

              \u5728\u8bb2select\u4e4b\u524d，\u6211\u4eec\u5fc5\u987b\u5148\u56de\u987e\u4e00\u4e2a\u6838\u5fc3\u7ed3\u8bba：\u4efb\u4f55 IO \u64cd\u4f5c\u90fd\u53ef\u4ee5\u62c6\u5206\u4e3a\u4e24\u4e2a\u6b65\u9aa4：\u7b49 + \u62f7\u8d1d\u3002<\/p>\n

              \u6211\u4eec\u4e4b\u524d\u7528\u7684read\u3001recv\u8fd9\u4e9b\u7cfb\u7edf\u8c03\u7528，\u5176\u5b9e\u662f\u628a\u8fd9\u4e24\u4ef6\u4e8b\u4e00\u8d77\u505a\u4e86：\u5148\u7b49\u6570\u636e\u5c31\u7eea，\u518d\u628a\u6570\u636e\u4ece\u5185\u6838\u62f7\u8d1d\u5230\u7528\u6237\u7a7a\u95f4\u3002\u800c\u591a\u8def\u8f6c\u63a5\u6280\u672f\u7684\u6838\u5fc3\u601d\u60f3，\u5c31\u662f\u628a\u8fd9\u4e24\u6b65\u5f7b\u5e95\u5206\u5f00：<\/p>\n

                \n
              • \u7b49：\u7531select\u3001poll\u3001epoll\u8fd9\u7c7b\u4e13\u95e8\u7684\u51fd\u6570\u6765\u505a，\u4e00\u6b21\u53ef\u4ee5\u540c\u65f6\u7b49\u591a\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26（fd）<\/li>\n
              • \u62f7\u8d1d：\u8fd8\u662f\u7531\u539f\u6765\u7684read\u3001recv\u3001write\u3001send\u6765\u505a，\u53ea\u6709\u5f53select\u544a\u8bc9\u6211\u4eec\u67d0\u4e2a fd \u5c31\u7eea\u4e86，\u6211\u4eec\u624d\u53bb\u8c03\u7528\u8fd9\u4e9b\u51fd\u6570<\/li>\n<\/ul>\n

                \u6362\u53e5\u8bdd\u8bf4，\u591a\u8def\u8f6c\u63a5\u5c31\u662f\u4e00\u4e2a\u5c31\u7eea\u4e8b\u4ef6\u7684\u901a\u77e5\u673a\u5236\u3002\u5b83\u544a\u8bc9\u6211\u4eec\u54ea\u4e2a fd \u5df2\u7ecf\u51c6\u5907\u597d\u4e86，\u53ef\u4ee5\u8fdb\u884c\u8bfb\u5199\u64cd\u4f5c\u4e86，\u800c\u6211\u4eec\u53ea\u9700\u8981\u5728\u6536\u5230\u901a\u77e5\u540e，\u53bb\u6267\u884c\u5b9e\u9645\u7684\u62f7\u8d1d\u64cd\u4f5c\u5373\u53ef\u3002<\/p>\n

                1.1 \u4ec0\u4e48\u662f \u201c\u6761\u4ef6\u5c31\u7eea\u201d<\/h3>\n

                select\u7b49\u591a\u8def\u590d\u7528\u51fd\u6570，\u672c\u8d28\u4e0a\u5c31\u662f\u5728\u7b49\u5f85 fd \u7684 \u201c\u6761\u4ef6\u5c31\u7eea\u201d\u3002\u6761\u4ef6\u5c31\u7eea\u5206\u4e3a\u4e24\u79cd：<\/p>\n

                  \n
                • \u8bfb\u5c31\u7eea：\u5185\u6838\u63a5\u6536\u7f13\u51b2\u533a\u4e2d\u6709\u6570\u636e\u53ef\u8bfb，\u6216\u8005\u6709\u65b0\u7684\u8fde\u63a5\u8bf7\u6c42\u5230\u6765<\/li>\n
                • \u5199\u5c31\u7eea：\u5185\u6838\u53d1\u9001\u7f13\u51b2\u533a\u4e2d\u6709\u7a7a\u95f2\u7a7a\u95f4，\u53ef\u4ee5\u5199\u5165\u6570\u636e<\/li>\n<\/ul>\n

                  \u5f53\u67d0\u4e2a fd \u6ee1\u8db3\u4ee5\u4e0a\u4efb\u610f\u4e00\u4e2a\u6761\u4ef6\u65f6，select\u5c31\u4f1a\u8fd4\u56de，\u544a\u8bc9\u6211\u4eec\u8fd9\u4e2a fd \u5df2\u7ecf\u5c31\u7eea，\u53ef\u4ee5\u8fdb\u884c\u5bf9\u5e94\u7684 IO \u64cd\u4f5c\u4e86\u3002<\/p>\n

                  \"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"<\/p>\n

                  1.2 \u5e38\u89c1\u591a\u8def\u590d\u7528\u65b9\u6848\u5bf9\u6bd4<\/h3>\n

                  Linux \u7cfb\u7edf\u63d0\u4f9b\u4e86\u4e09\u79cd\u4e3b\u6d41\u7684\u591a\u8def\u590d\u7528\u5b9e\u73b0，\u5b83\u4eec\u7684\u6838\u5fc3\u601d\u60f3\u4e00\u81f4，\u4f46\u5728\u6027\u80fd\u548c\u4f7f\u7528\u65b9\u5f0f\u4e0a\u6709\u5f88\u5927\u533a\u522b：<\/p>\n\n\u65b9\u6848\u652f\u6301\u7cfb\u7edf\u6570\u636e\u7ed3\u6784\u8fde\u63a5\u6570\u4e0a\u9650\u6548\u7387<\/tr>\n\n\n\n\n
                  select<\/td>\nPOSIX \u517c\u5bb9（Linux\/Windows\/macOS）<\/td>\n\u4f4d\u56fe<\/td>\n\u56fa\u5b9a（\u9ed8\u8ba4 1024）<\/td>\n\u4f4e，\u5185\u6838\u9700\u7ebf\u6027\u904d\u5386\u6240\u6709 fd<\/td>\n<\/tr>\n
                  poll<\/td>\nLinux\/macOS<\/td>\n\u94fe\u8868<\/td>\n\u65e0\u56fa\u5b9a\u4e0a\u9650（\u53d7\u5185\u5b58\u9650\u5236）<\/td>\n\u4e2d，\u4ecd\u9700\u7ebf\u6027\u904d\u5386<\/td>\n<\/tr>\n
                  epoll<\/td>\n\u4ec5 Linux<\/td>\n\u7ea2\u9ed1\u6811 + \u5c31\u7eea\u94fe\u8868<\/td>\n\u65e0\u56fa\u5b9a\u4e0a\u9650<\/td>\n\u9ad8，\u4ec5\u901a\u77e5\u6d3b\u8dc3 fd，\u65e0\u9700\u904d\u5386<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

                  \u867d\u7136epoll\u662f\u76ee\u524d\u6027\u80fd\u6700\u597d\u7684，\u4f46select\u4f5c\u4e3a\u6700\u57fa\u7840\u3001\u6700\u901a\u7528\u7684\u5b9e\u73b0，\u662f\u6211\u4eec\u5fc5\u987b\u638c\u63e1\u7684\u3002<\/p>\n

                  \"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"<\/p>\n

                  \n

                  \u4e8c. select \u51fd\u6570\u8be6\u89e3<\/h2>\n

                  select\u51fd\u6570\u7684\u539f\u578b\u5982\u4e0b：<\/p>\n

                  #<\/span>include<\/span> <sys\/select.h><\/span><\/span><\/p>\n

                  int<\/span> select<\/span>(<\/span>int<\/span> nfds,<\/span> fd_set *<\/span>readfds,<\/span> fd_set *<\/span>writefds,<\/span> fd_set *<\/span>exceptfds,<\/span>
                  \n struct<\/span> timeval<\/span> *<\/span>timeout)<\/span>;<\/span><\/p>\n

                  \u8fd9\u4e2a\u51fd\u6570\u770b\u8d77\u6765\u53c2\u6570\u5f88\u591a，\u4f46\u5176\u5b9e\u903b\u8f91\u975e\u5e38\u6e05\u6670\u3002\u4e0b\u9762\u6211\u4eec\u9010\u4e2a\u62c6\u89e3\u6bcf\u4e00\u4e2a\u53c2\u6570\u7684\u542b\u4e49\u3002<\/p>\n

                  2.1 \u53c2\u6570\u8be6\u89e3<\/h3>\n

                  1. nfds：\u6700\u5927\u6587\u4ef6\u63cf\u8ff0\u7b26 + 1<\/p>\n

                  \u8fd9\u662f\u6700\u5bb9\u6613\u88ab\u8bef\u89e3\u7684\u4e00\u4e2a\u53c2\u6570\u3002\u5f88\u591a\u4eba\u4ee5\u4e3a\u5b83\u662f\u8981\u76d1\u542c\u7684 fd \u7684\u4e2a\u6570，\u5176\u5b9e\u4e0d\u662f\u3002nfds \u7684\u503c\u5e94\u8be5\u662f\u4f60\u8981\u76d1\u542c\u7684\u6240\u6709 fd \u4e2d，\u6700\u5927\u7684\u90a3\u4e2a fd \u7684\u503c\u518d\u52a0 1\u3002<\/p>\n

                  \u6bd4\u5982\u4f60\u8981\u76d1\u542c fd=3\u3001fd=5\u3001fd=7 \u8fd9\u4e09\u4e2a fd，\u90a3\u4e48nfds\u5e94\u8be5\u8bbe\u7f6e\u4e3a7+1=8\u3002\u8fd9\u6837\u5185\u6838\u53ea\u9700\u8981\u904d\u5386 0 \u5230 7 \u8fd9 8 \u4e2a fd，\u800c\u4e0d\u9700\u8981\u904d\u5386\u6574\u4e2a 1024 \u4f4d\u7684\u4f4d\u56fe，\u63d0\u9ad8\u4e86\u6548\u7387\u3002<\/p>\n

                  2. readfds\u3001writefds\u3001exceptfds：\u4e09\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\u96c6<\/p>\n

                  \u8fd9\u4e09\u4e2a\u53c2\u6570\u5206\u522b\u5bf9\u5e94\u6211\u4eec\u8981\u76d1\u542c\u7684\u8bfb\u4e8b\u4ef6\u3001\u5199\u4e8b\u4ef6\u548c\u5f02\u5e38\u4e8b\u4ef6\u7684 fd \u96c6\u5408\u3002\u5b83\u4eec\u7684\u7c7b\u578b\u90fd\u662ffd_set，\u672c\u8d28\u4e0a\u662f\u4e00\u4e2a\u4f4d\u56fe\u7ed3\u6784\u3002<\/p>\n

                  fd_set\u7ed3\u6784\u4f53\u7684\u5b9a\u4e49\u5927\u81f4\u5982\u4e0b：<\/p>\n

                  typedef<\/span> struct<\/span> {<\/span>
                  \n long<\/span> int<\/span> fds_bits[<\/span>__FD_SETSIZE \/<\/span> __NFDBITS]<\/span>;<\/span>
                  \n}<\/span> fd_set;<\/span><\/p>\n

                  \u5176\u4e2d__FD_SETSIZE\u9ed8\u8ba4\u662f 1024，\u6240\u4ee5select\u6700\u591a\u53ea\u80fd\u540c\u65f6\u76d1\u542c 1024 \u4e2a fd，\u8fd9\u662f\u5b83\u6700\u81f4\u547d\u7684\u7f3a\u70b9\u4e4b\u4e00\u3002<\/p>\n

                  \u4e3a\u4e86\u65b9\u4fbf\u64cd\u4f5c\u8fd9\u4e2a\u4f4d\u56fe，\u7cfb\u7edf\u63d0\u4f9b\u4e86\u56db\u4e2a\u5b8f：<\/p>\n

                  \/\/ \u6e05\u7a7afd_set\u4e2d\u7684\u6240\u6709\u4f4d<\/span>
                  \nvoid<\/span> FD_ZERO<\/span>(<\/span>fd_set *<\/span>set)<\/span>;<\/span>
                  \n\/\/ \u5c06fd\u6dfb\u52a0\u5230fd_set\u4e2d<\/span>
                  \nvoid<\/span> FD_SET<\/span>(<\/span>int<\/span> fd,<\/span> fd_set *<\/span>set)<\/span>;<\/span>
                  \n\/\/ \u5c06fd\u4ecefd_set\u4e2d\u79fb\u9664<\/span>
                  \nvoid<\/span> FD_CLR<\/span>(<\/span>int<\/span> fd,<\/span> fd_set *<\/span>set)<\/span>;<\/span>
                  \n\/\/ \u6d4b\u8bd5fd\u662f\u5426\u5728fd_set\u4e2d\u88ab\u7f6e\u4f4d<\/span>
                  \nint<\/span> FD_ISSET<\/span>(<\/span>int<\/span> fd,<\/span> fd_set *<\/span>set)<\/span>;<\/span><\/p>\n

                  \u975e\u5e38\u91cd\u8981\u7684\u4e00\u70b9：\u8fd9\u4e09\u4e2a\u53c2\u6570\u90fd\u662f\u8f93\u5165\u8f93\u51fa\u578b\u53c2\u6570\u3002<\/p>\n

                    \n
                  • \u8f93\u5165\u65f6：\u7528\u6237\u901a\u8fc7\u8fd9\u4e09\u4e2a\u53c2\u6570\u544a\u8bc9\u5185\u6838，\u6211\u4eec\u5173\u5fc3\u54ea\u4e9b fd \u4e0a\u7684\u54ea\u4e9b\u4e8b\u4ef6<\/li>\n
                  • \u8f93\u51fa\u65f6：\u5185\u6838\u901a\u8fc7\u8fd9\u4e09\u4e2a\u53c2\u6570\u544a\u8bc9\u7528\u6237，\u54ea\u4e9b fd \u4e0a\u7684\u54ea\u4e9b\u4e8b\u4ef6\u5df2\u7ecf\u5c31\u7eea\u4e86<\/li>\n<\/ul>\n

                    \u4e5f\u5c31\u662f\u8bf4，\u6bcf\u6b21\u8c03\u7528select\u4e4b\u540e，\u8fd9\u4e09\u4e2afd_set\u90fd\u4f1a\u88ab\u5185\u6838\u4fee\u6539\u3002\u672a\u5c31\u7eea\u7684 fd \u5bf9\u5e94\u7684\u4f4d\u4f1a\u88ab\u6e05\u7a7a，\u53ea\u6709\u5c31\u7eea\u7684 fd \u5bf9\u5e94\u7684\u4f4d\u4f1a\u88ab\u4fdd\u7559\u3002\u56e0\u6b64，\u6bcf\u6b21\u8c03\u7528**select**\u4e4b\u524d，\u90fd\u5fc5\u987b\u91cd\u65b0\u8bbe\u7f6e\u8fd9\u4e09\u4e2a\u53c2\u6570\u3002<\/p>\n

                    3. timeout：\u8d85\u65f6\u65f6\u95f4<\/p>\n

                    \u8fd9\u4e2a\u53c2\u6570\u7528\u6765\u8bbe\u7f6eselect\u7684\u7b49\u5f85\u65f6\u95f4，\u7c7b\u578b\u662fstruct timeval：<\/p>\n

                    struct<\/span> timeval<\/span> {<\/span>
                    \n time_t<\/span> tv_sec;<\/span> \/\/ \u79d2<\/span>
                    \n suseconds_t<\/span> tv_usec;<\/span> \/\/ \u5fae\u79d2<\/span>
                    \n}<\/span>;<\/span><\/p>\n

                    timeout\u6709\u4e09\u79cd\u53d6\u503c：<\/p>\n

                      \n
                    • NULL：select\u4f1a\u6c38\u4e45\u963b\u585e，\u76f4\u5230\u6709 fd \u5c31\u7eea<\/li>\n
                    • {0, 0}：select\u4f1a\u7acb\u5373\u8fd4\u56de，\u4e0d\u963b\u585e，\u8fd9\u662f\u975e\u963b\u585e\u6a21\u5f0f<\/li>\n
                    • \u7279\u5b9a\u65f6\u95f4\u503c：select\u4f1a\u963b\u585e\u6307\u5b9a\u7684\u65f6\u95f4，\u5982\u679c\u5728\u8fd9\u6bb5\u65f6\u95f4\u5185\u6ca1\u6709 fd \u5c31\u7eea，\u5c31\u8fd4\u56de 0<\/li>\n<\/ul>\n

                      \u6ce8\u610f：\u5f53select\u56e0\u4e3a\u6709 fd \u5c31\u7eea\u800c\u8fd4\u56de\u65f6，timeout\u7ed3\u6784\u4f53\u7684\u503c\u4f1a\u88ab\u4fee\u6539\u4e3a\u5269\u4f59\u7684\u65f6\u95f4\u3002\u6bd4\u5982\u4f60\u8bbe\u7f6e\u4e86 5 \u79d2\u8d85\u65f6，\u7ed3\u679c 2 \u79d2\u540e\u5c31\u6709 fd \u5c31\u7eea\u4e86，\u90a3\u4e48\u8fd4\u56de\u65f6timeout.tv_sec\u4f1a\u53d8\u6210 3\u3002<\/p>\n

                      2.2 \u8fd4\u56de\u503c<\/h3>\n

                      select\u7684\u8fd4\u56de\u503c\u6709\u4e09\u79cd\u60c5\u51b5：<\/p>\n

                        \n
                      • > 0：\u6210\u529f，\u8fd4\u56de\u5c31\u7eea\u7684 fd \u7684\u4e2a\u6570<\/li>\n
                      • = 0：\u8d85\u65f6，\u5728\u6307\u5b9a\u65f6\u95f4\u5185\u6ca1\u6709\u4efb\u4f55 fd \u5c31\u7eea<\/li>\n
                      • < 0：\u51fa\u9519，\u9519\u8bef\u7801\u5b58\u653e\u5728errno\u4e2d<\/li>\n<\/ul>\n

                        \"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"<\/p>\n

                        \n

                        \u4e09. socket \u5c31\u7eea\u6761\u4ef6\u8be6\u89e3<\/h2>\n

                        \u5f88\u591a\u4eba\u5199select\u4ee3\u7801\u65f6，\u4e0d\u77e5\u9053\u4ec0\u4e48\u65f6\u5019 fd \u624d\u7b97\u5c31\u7eea\u3002\u8fd9\u91cc\u6211\u4eec\u8be6\u7ec6\u8bb2\u89e3\u4e00\u4e0b TCP socket \u7684\u5c31\u7eea\u6761\u4ef6，\u8fd9\u662f\u6b63\u786e\u4f7f\u7528select\u7684\u524d\u63d0\u3002<\/p>\n

                        3.1 \u8bfb\u5c31\u7eea<\/h3>\n

                        \u5f53\u6ee1\u8db3\u4ee5\u4e0b\u4efb\u610f\u4e00\u4e2a\u6761\u4ef6\u65f6，socket \u5c31\u5904\u4e8e\u8bfb\u5c31\u7eea\u72b6\u6001：<\/p>\n

                      • \u5185\u6838\u63a5\u6536\u7f13\u51b2\u533a\u4e2d\u7684\u5b57\u8282\u6570\u5927\u4e8e\u7b49\u4e8e\u4f4e\u6c34\u4f4d\u6807\u8bb0SO_RCVLOWAT（\u9ed8\u8ba4\u662f 1），\u6b64\u65f6\u53ef\u4ee5\u65e0\u963b\u585e\u5730\u8bfb\u53d6\u6570\u636e，\u5e76\u4e14\u8fd4\u56de\u503c\u5927\u4e8e 0<\/li>\n
                      • TCP \u901a\u4fe1\u4e2d，\u5bf9\u7aef\u5173\u95ed\u4e86\u8fde\u63a5，\u6b64\u65f6\u5bf9\u8be5 socket \u8bfb\u4f1a\u8fd4\u56de 0<\/li>\n
                      • \u76d1\u542c\u7684 socket \u4e0a\u6709\u65b0\u7684\u8fde\u63a5\u8bf7\u6c42\u5230\u6765（\u8fd9\u662f\u670d\u52a1\u5668\u6700\u6838\u5fc3\u7684\u4e8b\u4ef6）<\/li>\n
                      • socket \u4e0a\u6709\u672a\u5904\u7406\u7684\u9519\u8bef<\/li>\n

                        3.2 \u5199\u5c31\u7eea<\/h3>\n

                        \u5f53\u6ee1\u8db3\u4ee5\u4e0b\u4efb\u610f\u4e00\u4e2a\u6761\u4ef6\u65f6，socket \u5c31\u5904\u4e8e\u5199\u5c31\u7eea\u72b6\u6001：<\/p>\n

                      • \u5185\u6838\u53d1\u9001\u7f13\u51b2\u533a\u4e2d\u7684\u53ef\u7528\u5b57\u8282\u6570\u5927\u4e8e\u7b49\u4e8e\u4f4e\u6c34\u4f4d\u6807\u8bb0SO_SNDLOWAT（\u9ed8\u8ba4\u662f 1），\u6b64\u65f6\u53ef\u4ee5\u65e0\u963b\u585e\u5730\u5199\u5165\u6570\u636e，\u5e76\u4e14\u8fd4\u56de\u503c\u5927\u4e8e 0<\/li>\n
                      • socket \u7684\u5199\u64cd\u4f5c\u88ab\u5173\u95ed（\u8c03\u7528\u4e86close\u6216shutdown），\u5bf9\u8fd9\u6837\u7684 socket \u5199\u4f1a\u89e6\u53d1SIGPIPE\u4fe1\u53f7<\/li>\n
                      • \u975e\u963b\u585econnect\u8fde\u63a5\u6210\u529f\u6216\u5931\u8d25\u4e4b\u540e<\/li>\n
                      • socket \u4e0a\u6709\u672a\u8bfb\u53d6\u7684\u9519\u8bef<\/li>\n

                        3.3 \u5f02\u5e38\u5c31\u7eea（\u9009\u5b66）<\/h3>\n

                        \u5f53 socket \u4e0a\u6536\u5230\u5e26\u5916\u6570\u636e（TCP \u7d27\u6025\u6570\u636e）\u65f6，\u5c31\u5904\u4e8e\u5f02\u5e38\u5c31\u7eea\u72b6\u6001\u3002\u8fd9\u5728\u5b9e\u9645\u5f00\u53d1\u4e2d\u5f88\u5c11\u7528\u5230，\u4e86\u89e3\u5373\u53ef\u3002<\/p>\n

                        \n

                        \u56db. select \u7684\u7f16\u7a0b\u7279\u70b9\u4e0e\u7f3a\u70b9<\/h2>\n

                        4.1 select \u7684\u7f16\u7a0b\u7279\u70b9<\/h3>\n

                        \u901a\u8fc7\u4e0a\u9762\u7684\u8bb2\u89e3，\u6211\u4eec\u53ef\u4ee5\u603b\u7ed3\u51faselect\u7f16\u7a0b\u7684\u51e0\u4e2a\u6838\u5fc3\u7279\u70b9：<\/p>\n

                      • \u9700\u8981\u8f85\u52a9\u6570\u7ec4\u4fdd\u5b58\u6240\u6709\u8981\u76d1\u542c\u7684 fd：\u56e0\u4e3aselect\u8fd4\u56de\u540e\u4f1a\u6e05\u7a7a\u672a\u5c31\u7eea\u7684 fd，\u6240\u4ee5\u6211\u4eec\u9700\u8981\u4e00\u4e2a\u989d\u5916\u7684\u6570\u636e\u7ed3\u6784（\u901a\u5e38\u662f\u6570\u7ec4）\u6765\u4fdd\u5b58\u6240\u6709\u8981\u76d1\u542c\u7684 fd，\u6bcf\u6b21\u8c03\u7528select\u524d，\u90fd\u8981\u4ece\u8fd9\u4e2a\u6570\u7ec4\u4e2d\u628a fd \u91cd\u65b0\u6dfb\u52a0\u5230fd_set\u4e2d<\/li>\n
                      • \u6bcf\u6b21\u8c03\u7528\u524d\u5fc5\u987b\u91cd\u7f6e fd_set：\u7531\u4e8efd_set\u662f\u8f93\u5165\u8f93\u51fa\u578b\u53c2\u6570，\u6bcf\u6b21\u8c03\u7528\u540e\u90fd\u4f1a\u88ab\u5185\u6838\u4fee\u6539，\u6240\u4ee5\u5fc5\u987b\u5728\u6bcf\u6b21\u5faa\u73af\u5f00\u59cb\u65f6，\u91cd\u65b0\u8c03\u7528FD_ZERO\u6e05\u7a7a，\u7136\u540e\u4ece\u8f85\u52a9\u6570\u7ec4\u4e2d\u91cd\u65b0\u6dfb\u52a0 fd<\/li>\n
                      • \u9700\u8981\u624b\u52a8\u8ba1\u7b97\u6700\u5927 fd：\u6bcf\u6b21\u6dfb\u52a0\u6216\u5220\u9664 fd \u65f6，\u90fd\u8981\u91cd\u65b0\u8ba1\u7b97\u5f53\u524d\u6700\u5927\u7684 fd，\u4f5c\u4e3anfds\u53c2\u6570\u7684\u503c<\/li>\n

                        4.2 select \u7684\u7f3a\u70b9<\/h3>\n

                        select\u867d\u7136\u7b80\u5355\u901a\u7528，\u4f46\u5b83\u7684\u7f3a\u70b9\u4e5f\u975e\u5e38\u660e\u663e：<\/p>\n

                      • \u652f\u6301\u7684 fd \u6570\u91cf\u6709\u9650：\u9ed8\u8ba4\u6700\u591a\u53ea\u80fd\u76d1\u542c 1024 \u4e2a fd，\u867d\u7136\u53ef\u4ee5\u901a\u8fc7\u91cd\u65b0\u7f16\u8bd1\u5185\u6838\u6765\u4fee\u6539，\u4f46\u8fd9\u4f1a\u5e26\u6765\u517c\u5bb9\u6027\u95ee\u9898<\/li>\n
                      • \u7528\u6237\u6001\u4e0e\u5185\u6838\u6001\u62f7\u8d1d\u5f00\u9500\u5927：\u6bcf\u6b21\u8c03\u7528select，\u90fd\u9700\u8981\u628a\u6574\u4e2afd_set\u4ece\u7528\u6237\u6001\u62f7\u8d1d\u5230\u5185\u6838\u6001，\u5f53 fd \u5f88\u591a\u65f6，\u8fd9\u4e2a\u5f00\u9500\u4f1a\u975e\u5e38\u5927<\/li>\n
                      • \u5185\u6838\u9700\u8981\u7ebf\u6027\u904d\u5386\u6240\u6709 fd：\u5185\u6838\u6bcf\u6b21\u90fd\u8981\u904d\u5386\u6240\u6709\u4f20\u5165\u7684 fd，\u68c0\u67e5\u662f\u5426\u6709\u4e8b\u4ef6\u5c31\u7eea，\u5f53 fd \u5f88\u591a\u65f6，\u6548\u7387\u4f1a\u6025\u5267\u4e0b\u964d<\/li>\n
                      • \u63a5\u53e3\u4f7f\u7528\u4e0d\u4fbf：\u6bcf\u6b21\u8c03\u7528\u524d\u90fd\u8981\u624b\u52a8\u91cd\u7f6efd_set，\u8ba1\u7b97\u6700\u5927 fd，\u975e\u5e38\u7e41\u7410<\/li>\n
                        \n

                        \u4e94. \u5b9e\u6218：\u4ece\u96f6\u5b9e\u73b0 select \u670d\u52a1\u5668<\/h2>\n

                        \u8bb2\u5b8c\u4e86\u7406\u8bba，\u6211\u4eec\u6765\u52a8\u624b\u5b9e\u73b0\u4e00\u4e2a\u57fa\u4e8eselect\u7684 TCP \u670d\u52a1\u5668\u3002\u8fd9\u4e2a\u670d\u52a1\u5668\u76ee\u524d\u53ea\u5904\u7406\u65b0\u8fde\u63a5\u7684\u5efa\u7acb，\u540e\u7eed\u6211\u4eec\u4f1a\u7ee7\u7eed\u5b8c\u5584，\u6dfb\u52a0\u5ba2\u6237\u7aef\u6570\u636e\u7684\u8bfb\u5199\u529f\u80fd\u3002<\/p>\n

                        5.1 \u57fa\u7840\u7ec4\u4ef6\u56de\u987e<\/h3>\n

                        \u6211\u4eec\u4f1a\u590d\u7528\u4e4b\u524d\u5c01\u88c5\u597d\u7684\u51e0\u4e2a\u57fa\u7840\u7ec4\u4ef6（\u60f3\u770b\u5177\u4f53\u5b9e\u73b0\u7684，\u53ef\u4ee5\u7ffb\u7ffb\u6211\u4e4b\u524d\u7684\u535a\u5ba2，\u6bd4\u5982\u7f51\u7edc\u7248\u672c\u8ba1\u7b97\u5668\u8fd9\u4e2a\u91cc\u9762\u597d\u50cf\u5c31\u6709）：<\/p>\n

                          \n
                        • InetAddr.hpp：\u5c01\u88c5\u4e86\u7f51\u7edc\u5730\u5740\u7684\u8f6c\u6362<\/li>\n
                        • Socket.hpp：\u5c01\u88c5\u4e86 TCP socket \u7684\u521b\u5efa\u3001\u7ed1\u5b9a\u3001\u76d1\u542c\u3001\u63a5\u53d7\u8fde\u63a5\u7b49\u64cd\u4f5c<\/li>\n
                        • Logger.hpp：\u7ebf\u7a0b\u5b89\u5168\u7684\u65e5\u5fd7\u7cfb\u7edf<\/li>\n
                        • Mutex.hpp：\u4e92\u65a5\u9501\u548c RAII \u9501\u5b88\u536b<\/li>\n<\/ul>\n

                          \u8fd9\u91cc\u91cd\u70b9\u770b\u4e00\u4e0bSocket.hpp\u4e2d\u65b0\u589e\u7684\u5730\u5740\u548c\u7aef\u53e3\u590d\u7528\u8bbe\u7f6e：<\/p>\n

                          void<\/span> CreateSocketOrDie<\/span>(<\/span>)<\/span> override
                          \n{<\/span>
                          \n _sockfd =<\/span> socket<\/span>(<\/span>AF_INET,<\/span> SOCK_STREAM,<\/span> 0<\/span>)<\/span>;<\/span>
                          \n if<\/span>(<\/span>_sockfd <<\/span> 0<\/span>)<\/span>
                          \n {<\/span>
                          \n LOG<\/span>(<\/span>LogLevel::<\/span>FATAL)<\/span> <<<\/span> "create socket error"<\/span>;<\/span>
                          \n exit<\/span>(<\/span>SOCKET_ERROR)<\/span>;<\/span>
                          \n }<\/span>
                          \n int<\/span> opt =<\/span> 1<\/span>;<\/span>
                          \n \/\/ \u8bbe\u7f6e\u5730\u5740\u590d\u7528<\/span>
                          \n setsockopt<\/span>(<\/span>_sockfd,<\/span> SOL_SOCKET,<\/span> SO_REUSEADDR,<\/span> &<\/span>opt,<\/span> sizeof<\/span>(<\/span>opt)<\/span>)<\/span>;<\/span>
                          \n \/\/ \u8bbe\u7f6e\u7aef\u53e3\u590d\u7528<\/span>
                          \n setsockopt<\/span>(<\/span>_sockfd,<\/span> SOL_SOCKET,<\/span> SO_REUSEPORT,<\/span> &<\/span>opt,<\/span> sizeof<\/span>(<\/span>opt)<\/span>)<\/span>;<\/span>
                          \n LOG<\/span>(<\/span>LogLevel::<\/span>INFO)<\/span> <<<\/span> "create socket success"<\/span>;<\/span>
                          \n}<\/span><\/p>\n

                          \u6dfb\u52a0\u8fd9\u4e24\u4e2a\u9009\u9879\u53ef\u4ee5\u89e3\u51b3\u670d\u52a1\u5668\u91cd\u542f\u65f6 \u201c\u5730\u5740\u5df2\u88ab\u5360\u7528\u201d \u7684\u95ee\u9898，\u662f\u670d\u52a1\u5668\u5f00\u53d1\u4e2d\u7684\u6700\u4f73\u5b9e\u8df5\u3002<\/p>\n

                          5.2 select \u670d\u52a1\u5668\u6838\u5fc3\u5b9e\u73b0<\/h3>\n

                          \u6211\u4eec\u7684selectServer\u7c7b\u7684\u6838\u5fc3\u4ee3\u7801\u5982\u4e0b：<\/p>\n

                          #<\/span>ifndef<\/span> __SELECTSERVER__HPP<\/span><\/span>
                          \n#<\/span>define<\/span> __SELECTSERVER__HPP<\/span><\/span><\/p>\n

                          #<\/span>include<\/span> "Logger.hpp"<\/span><\/span>
                          \n#<\/span>include<\/span> "InetAddr.hpp"<\/span><\/span>
                          \n#<\/span>include<\/span> "Socket.hpp"<\/span><\/span>
                          \n#<\/span>include<\/span> <bits\/types\/struct_timeval.h><\/span><\/span>
                          \n#<\/span>include<\/span> <cstdint><\/span><\/span>
                          \n#<\/span>include<\/span> <memory><\/span><\/span>
                          \n#<\/span>include<\/span> <sys\/select.h><\/span><\/span><\/p>\n

                          \/\/ [\u6838\u5fc3\u89e3\u6790]：sizeof(fd_set) \u901a\u5e38\u662f 128 \u5b57\u8282，128 * 8 = 1024\u3002\u8fd9\u662f select \u5e95\u5c42\u4f4d\u56fe\u80fd\u8868\u793a\u7684\u6700\u5927\u6bd4\u7279\u4f4d\u6570\u3002<\/span>
                          \n\/\/ \u6362\u53e5\u8bdd\u8bf4，\u8fd9\u4e5f\u76f4\u63a5\u9501\u6b7b\u4e86\u6211\u4eec\u8fd9\u4e2a\u670d\u52a1\u5668\u6700\u591a\u53ea\u80fd\u540c\u65f6\u6258\u7ba1 1024 \u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26（\u5305\u542b\u76d1\u542c\u5957\u63a5\u5b57）\u3002<\/span>
                          \n#<\/span>define<\/span> NUM<\/span> (<\/span>sizeof<\/span>(<\/span>fd_set)<\/span> *<\/span> 8<\/span>)<\/span><\/span><\/span>
                          \nusing<\/span> namespace<\/span> LogModule;<\/span>
                          \nconst<\/span> int<\/span> gdefaultfd =<\/span> –<\/span>1<\/span>;<\/span><\/p>\n

                          class<\/span> selectServer<\/span>
                          \n{<\/span>
                          \npublic<\/span>:<\/span>
                          \n selectServer<\/span>(<\/span>uint16_t<\/span> port)<\/span>
                          \n :<\/span>_port<\/span>(<\/span>port)<\/span>
                          \n ,<\/span>_listenfd<\/span>(<\/span>std::<\/span>make_unique<\/span><<\/span>TcpSocket><\/span><\/span><\/span>(<\/span>)<\/span>)<\/span>
                          \n {<\/span>
                          \n _listenfd-><\/span>BulidSocketMethod<\/span>(<\/span>_port)<\/span>;<\/span>
                          \n \/\/ \u521d\u59cb\u5316<\/span>
                          \n \/\/ [\u6838\u5fc3\u89e3\u6790]：\u8f85\u52a9\u6570\u7ec4\u7684\u4f5c\u7528\u662f\u5728\u7528\u6237\u6001（\u5e94\u7528\u5c42）\u4fdd\u5b58\u6240\u6709\u9700\u8981\u88ab select \u76d1\u63a7\u7684 fd\u3002<\/span>
                          \n \/\/ \u521d\u59cb\u65f6\u5168\u90e8\u7f6e\u4e3a -1 (gdefaultfd)，\u8868\u793a\u8be5\u69fd\u4f4d\u76ee\u524d\u4e3a\u7a7a\u95f2\u72b6\u6001，\u6ca1\u6709\u5206\u914d\u7ed9\u4efb\u4f55\u8fde\u63a5\u3002<\/span>
                          \n for<\/span>(<\/span>int<\/span> i =<\/span> 0<\/span>;<\/span> i <<\/span> NUM;<\/span> i++<\/span>)<\/span>
                          \n {<\/span>
                          \n arr_fds[<\/span>i]<\/span> =<\/span> gdefaultfd;<\/span>
                          \n }<\/span>
                          \n \/\/ \u9996\u5148\u628a_litenfd \u653e\u5165\u6570\u7ec4\u91cc\u9762<\/span>
                          \n \/\/ [\u6838\u5fc3\u89e3\u6790]：\u670d\u52a1\u5668\u521a\u542f\u52a8\u65f6，\u552f\u4e00\u5b58\u5728\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u5c31\u662f\u76d1\u542c\u5957\u63a5\u5b57 (_listenfd)\u3002<\/span>
                          \n \/\/ \u5fc5\u987b\u628a\u5b83\u4f5c\u4e3a\u7b2c\u4e00\u4e2a\u201c\u706b\u79cd\u201d\u653e\u5165\u8f85\u52a9\u6570\u7ec4\u7684 0 \u53f7\u4f4d，\u8ba9 select \u8dd1\u8d77\u6765\u53bb\u611f\u77e5\u7b2c\u4e00\u6279\u65b0\u8fde\u63a5\u7684\u5230\u6765\u3002<\/span>
                          \n arr_fds[<\/span>0<\/span>]<\/span> =<\/span> _listenfd-><\/span>Socketfd<\/span>(<\/span>)<\/span>;<\/span>
                          \n }<\/span><\/p>\n

                          void<\/span> Start<\/span>(<\/span>)<\/span>
                          \n {<\/span>
                          \n fd_set rfds;<\/span> \/\/ read fd set<\/span>
                          \n while<\/span>(<\/span>true<\/span>)<\/span>
                          \n {<\/span>
                          \n \/\/ rfds \u53c2\u6570\u91cd\u7f6e<\/span>
                          \n \/\/ [\u6838\u5fc3\u89e3\u6790]：\u3010\u9ad8\u9891\u8003\u70b9\u3011\u56e0\u4e3a select \u8fd4\u56de\u65f6，\u5185\u6838\u4f1a\u628a\u201c\u672a\u5c31\u7eea\u201d\u7684 fd \u4ece rfds \u4e2d\u6e05\u96f6（\u8f93\u5165\u8f93\u51fa\u578b\u53c2\u6570\u7684\u7279\u6027）\u3002<\/span>
                          \n \/\/ \u5982\u679c\u4e0d\u6bcf\u6b21\u6e05\u7a7a\u5e76\u91cd\u65b0\u8bbe\u7f6e，\u4e0b\u4e00\u6b21\u5faa\u73af\u7cfb\u7edf\u5c31\u518d\u4e5f\u4e0d\u4f1a\u53bb\u76d1\u542c\u90a3\u4e9b\u66fe\u7ecf\u672a\u5c31\u7eea\u7684 fd \u4e86\u3002<\/span>
                          \n FD_ZERO<\/span>(<\/span>&<\/span>rfds)<\/span>;<\/span><\/p>\n

                          \/\/ [\u6838\u5fc3\u89e3\u6790]：select \u7684\u7b2c\u4e00\u4e2a\u53c2\u6570\u8981\u6c42\u4f20\u5165\u6700\u5927 fd \u7684\u503c\u3002<\/span>
                          \n \/\/ \u56e0\u4e3a\u968f\u7740\u5ba2\u6237\u7aef\u7684\u8fde\u63a5\u548c\u65ad\u5f00，fd \u662f\u52a8\u6001\u53d8\u5316\u7684，\u6240\u4ee5\u6211\u4eec\u5fc5\u987b\u5728\u6bcf\u6b21\u5faa\u73af\u4e2d\u91cd\u65b0\u8ba1\u7b97\u51fa\u5f53\u524d\u6258\u7ba1\u7684 max_fd\u3002<\/span>
                          \n int<\/span> max_fd =<\/span> gdefaultfd;<\/span>
                          \n for<\/span>(<\/span>int<\/span> i =<\/span> 0<\/span>;<\/span> i <<\/span> NUM;<\/span> i++<\/span>)<\/span>
                          \n {<\/span>
                          \n if<\/span>(<\/span>arr_fds[<\/span>i]<\/span> ==<\/span> gdefaultfd)<\/span>
                          \n continue<\/span>;<\/span>
                          \n \/\/ \u628a\u65b0\u7684\u6dfb\u52a0\u8fdb\u53bb<\/span>
                          \n FD_SET<\/span>(<\/span>arr_fds[<\/span>i]<\/span>,<\/span> &<\/span>rfds)<\/span>;<\/span>
                          \n if<\/span>(<\/span>max_fd <<\/span> arr_fds[<\/span>i]<\/span>)<\/span> max_fd =<\/span> arr_fds[<\/span>i]<\/span>;<\/span> \/\/ \u66f4\u65b0\u6700\u5927\u6587\u4ef6\u63cf\u8ff0\u7b26<\/span>
                          \n }<\/span><\/p>\n

                          \/\/ struct timeval timeout = {5,0}; \/\/ \u6211\u4eec\u4eca\u5929\u8fd9\u91cc\u5148\u4e0d\u4f7f\u7528\u8fd9\u4e2a<\/span>
                          \n \/\/ int n = select(max_fd + 1, &rfds, nullptr, nullptr, &timeout);<\/span><\/p>\n

                          \/\/ [\u6838\u5fc3\u89e3\u6790]：\u7b2c\u4e00\u4e2a\u53c2\u6570\u5fc5\u987b\u662f max_fd + 1，\u8fd9\u662f\u64cd\u4f5c\u7cfb\u7edf\u5e95\u5c42\u8f6e\u8be2\u4f4d\u56fe\u7684\u8fb9\u754c\u8981\u6c42\u3002<\/span>
                          \n \/\/ \u6700\u540e\u4e00\u4e2a\u53c2\u6570\u8bbe\u4e3a nullptr，\u8868\u793a\u91c7\u7528\u7eaf\u963b\u585e\u7b49\u5f85\u6a21\u5f0f，\u6ca1\u6709 fd \u5c31\u7eea\u5c31\u6b7b\u7b49，\u4e0d\u6d88\u8017 CPU \u8d44\u6e90\u3002<\/span>
                          \n int<\/span> n =<\/span> select<\/span>(<\/span>max_fd +<\/span> 1<\/span>,<\/span> &<\/span>rfds,<\/span> nullptr<\/span>,<\/span> nullptr<\/span>,<\/span> nullptr<\/span>)<\/span>;<\/span>
                          \n switch<\/span> (<\/span>n)<\/span>
                          \n {<\/span>
                          \n case<\/span> 0<\/span>:<\/span>
                          \n LOG<\/span>(<\/span>LogLevel::<\/span>DEBUG)<\/span> <<<\/span> "time out…"<\/span>;<\/span>
                          \n break<\/span>;<\/span>
                          \n case<\/span> –<\/span>1<\/span>:<\/span>
                          \n LOG<\/span>(<\/span>LogLevel::<\/span>DEBUG)<\/span> <<<\/span> "select error…"<\/span>;<\/span>
                          \n break<\/span>;<\/span>
                          \n default<\/span>:<\/span>
                          \n LOG<\/span>(<\/span>LogLevel::<\/span>DEBUG)<\/span> <<<\/span> "\u4e8b\u4ef6\u5c31\u7eea…: n: "<\/span> <<<\/span> n;<\/span>
                          \n \/\/ [\u6838\u5fc3\u89e3\u6790]：\u3010\u91cd\u8981\u63d0\u793a\u3011\u76ee\u524d\u4ee3\u7801\u7684\u903b\u8f91\u662f\u53ea\u8981\u6709\u4e8b\u4ef6\u5c31\u7eea（n > 0），\u5c31\u7edf\u7edf\u4ea4\u7531 HandlerEvent \u53bb\u5904\u7406\u65b0\u8fde\u63a5\u3002<\/span>
                          \n \/\/ \u8fd9\u662f\u4e00\u4e2a\u7b80\u5316\u7248\u7684\u9aa8\u67b6\u3002\u5b9e\u9645\u4e0a\u5728\u5b8c\u6574\u7684\u903b\u8f91\u4e2d，\u6211\u4eec\u8fd8\u9700\u8981\u5728\u8fd9\u91cc\u904d\u5386 arr_fds，<\/span>
                          \n \/\/ \u5229\u7528 FD_ISSET() \u53bb\u7cbe\u51c6\u5224\u65ad：\u5230\u5e95\u662f _listenfd \u5c31\u7eea\u4e86（\u6765\u65b0\u8fde\u63a5\u4e86），\u8fd8\u662f\u666e\u901a\u7684\u666e\u901a\u901a\u4fe1 fd \u5c31\u7eea\u4e86（\u6709\u6570\u636e\u53d1\u6765\u4e86）\u3002<\/span>
                          \n HandlerEvent<\/span>(<\/span>)<\/span>;<\/span>
                          \n break<\/span>;<\/span>
                          \n }<\/span>
                          \n }<\/span>
                          \n }<\/span><\/p>\n

                          ~<\/span>selectServer<\/span>(<\/span>)<\/span>
                          \n {<\/span>}<\/span><\/p>\n

                          private<\/span>:<\/span>
                          \n void<\/span> HandlerEvent<\/span>(<\/span>)<\/span>
                          \n {<\/span>
                          \n InetAddr clientaddr;<\/span><\/p>\n

                          \/\/ [\u6838\u5fc3\u89e3\u6790]：\u8fd9\u91cc\u7684 Accept \u7edd\u5bf9\u4e0d\u4f1a\u53d1\u751f\u963b\u585e！<\/span>
                          \n \/\/ \u56e0\u4e3a\u6b63\u662f\u5916\u5c42\u7684 select \u5df2\u7ecf\u5e2e\u6211\u4eec\u201c\u7b49\u201d\u5230\u4e86\u5e95\u5c42\u4e09\u6b21\u63e1\u624b\u5b8c\u6210（\u8bfb\u4e8b\u4ef6\u5c31\u7eea），\u6240\u4ee5\u6211\u4eec\u4e00\u8c03 Accept \u5c31\u80fd\u77ac\u95f4\u62ff\u5230\u65b0\u8fde\u63a5\u3002<\/span>
                          \n int<\/span> fd =<\/span> _listenfd-><\/span>Accepter<\/span>(<\/span>&<\/span>clientaddr)<\/span>;<\/span>
                          \n LOG<\/span>(<\/span>LogLevel::<\/span>INFO)<\/span> <<<\/span> "get a new link…"<\/span>;<\/span><\/p>\n

                          \/\/ \u4f60\u5f97\u5230\u4e86\u4e00\u4e2a\u65b0\u7684\u8fde\u63a5，\u8fd9\u4e2a\u8fde\u63a5\u600e\u4e48\u5904\u7406？？<\/span>
                          \n \/\/ recv(fd)?? \u7b49 + \u62f7\u8d1d， \u4e0d\u80fd！！<\/span>
                          \n \/\/ fd -> \u6258\u7ba1\u7ed9select-> \u53ea\u6709select\u5177\u6709"\u7b49"\u7684\u80fd\u529b!-> \u5982\u4f55\u6258\u7ba1？？ -> \u53ea\u8981\u628afd\u6dfb\u52a0\u7684\u8f85\u52a9\u6570\u7ec4\u5373\u53ef！<\/span><\/p>\n

                          if<\/span>(<\/span>fd >=<\/span> 0<\/span>)<\/span>
                          \n {<\/span>
                          \n \/\/ \u627e\u4e00\u4e2a\u7a7a\u95f2\u7684\u4f4d\u7f6e<\/span>
                          \n \/\/ [\u6838\u5fc3\u89e3\u6790]：\u7531\u4e8e\u4e0d\u80fd\u7acb\u523b recv，\u6211\u4eec\u5fc5\u987b\u628a\u8fd9\u4e2a\u521a\u521a\u62ff\u5230\u7684 fd \u5b58\u8fdb\u8f85\u52a9\u6570\u7ec4\u91cc\u3002<\/span>
                          \n int<\/span> pos =<\/span> 0<\/span>;<\/span>
                          \n for<\/span>(<\/span>;<\/span>pos <<\/span> NUM;<\/span> pos++<\/span>)<\/span>
                          \n {<\/span>
                          \n if<\/span>(<\/span>arr_fds[<\/span>pos]<\/span> ==<\/span> gdefaultfd)<\/span>
                          \n break<\/span>;<\/span>
                          \n }<\/span><\/p>\n

                          if<\/span>(<\/span>pos ==<\/span> NUM)<\/span>
                          \n {<\/span>
                          \n \/\/ \u904d\u5386\u5b8c\u4e86\u627e\u4e0d\u5230<\/span>
                          \n \/\/ [\u6838\u5fc3\u89e3\u6790]：\u6570\u7ec4\u6ee1\u4e86，\u8bf4\u660e\u670d\u52a1\u5668\u8fbe\u5230\u4e86 1024 \u4e2a\u5e76\u53d1\u8fde\u63a5\u7684\u7269\u7406\u4e0a\u9650\u3002<\/span>
                          \n \/\/ \u6b64\u65f6\u5fc3\u6709\u4f59\u800c\u529b\u4e0d\u8db3，\u53ea\u80fd\u65e0\u60c5\u5730\u5173\u95ed\u6389\u8fd9\u4e2a\u65b0\u5efa\u7acb\u7684\u8fde\u63a5，\u4fdd\u62a4\u670d\u52a1\u5668\u4e0d\u5d29\u6e83\u3002<\/span>
                          \n close<\/span>(<\/span>fd)<\/span>;<\/span>
                          \n }<\/span>
                          \n else<\/span>
                          \n {<\/span>
                          \n \/\/ \u628a\u8fd9\u4e2a\u65b0\u83b7\u53d6\u5230\u7684\u52a0\u8fdb\u8f85\u52a9\u6570\u7ec4\u5373\u53ef<\/span>
                          \n \/\/ \u4e0b\u4e00\u8f6e\u5faa\u73af\u7684\u65f6\u5019, \u4f1a\u5173\u5fc3\u4e0a\u7684<\/span>
                          \n \/\/ [\u6838\u5fc3\u89e3\u6790]：\u903b\u8f91\u5b8c\u7f8e\u95ed\u73af！\u5c06\u65b0 fd \u586b\u5165\u6570\u7ec4\u7684\u7a7a\u95f2\u69fd\u4f4d\u3002<\/span>
                          \n \/\/ \u5f53\u6b64\u51fd\u6570\u6267\u884c\u5b8c\u6bd5，\u4ee3\u7801\u6d41\u4f1a\u91cd\u8fd4\u5916\u5c42 while(true) \u7684\u8d77\u70b9\u3002<\/span>
                          \n \/\/ \u4e0b\u4e00\u6b21\u904d\u5386\u8f85\u52a9\u6570\u7ec4\u65f6，\u8fd9\u4e2a\u5d2d\u65b0\u7684 fd \u5c31\u4f1a\u81ea\u7136\u800c\u7136\u5730\u88ab FD_SET \u52a0\u5165\u4f4d\u56fe，\u6b63\u5f0f\u79fb\u4ea4\u5185\u6838\u7684 select \u6258\u7ba1！<\/span>
                          \n arr_fds[<\/span>pos]<\/span> =<\/span> fd;<\/span>
                          \n }<\/span>
                          \n }<\/span>
                          \n }<\/span><\/p>\n

                          private<\/span>:<\/span>
                          \n uint16_t<\/span> _port;<\/span>
                          \n std::<\/span>unique_ptr<<\/span>Socket><\/span> _listenfd;<\/span>
                          \n \/\/ \u9700\u8981\u4e00\u4e2a\u8f85\u52a9\u6570\u7ec4<\/span>
                          \n int<\/span> arr_fds[<\/span>NUM]<\/span>;<\/span>
                          \n}<\/span>;<\/span>
                          \n#<\/span>endif<\/span><\/span><\/p>\n

                          5.3 \u4e3b\u51fd\u6570<\/h3>\n

                          \u4e3b\u51fd\u6570\u975e\u5e38\u7b80\u5355，\u53ea\u9700\u8981\u521b\u5efa\u4e00\u4e2aselectServer\u5bf9\u8c61\u5e76\u542f\u52a8\u5373\u53ef：<\/p>\n

                          #<\/span>include<\/span> "selectServer.hpp"<\/span><\/span>
                          \n#<\/span>include<\/span> <cstdint><\/span><\/span>
                          \n#<\/span>include<\/span> <memory><\/span><\/span><\/p>\n

                          \/\/ \u5b9a\u4e49\u670d\u52a1\u5668\u7ed1\u5b9a\u7684\u9ed8\u8ba4\u7aef\u53e3\u53f7<\/span>
                          \nconst<\/span> uint16_t<\/span> gport =<\/span> 8080<\/span>;<\/span><\/p>\n

                          int<\/span> main<\/span>(<\/span>)<\/span>
                          \n{<\/span>
                          \n \/\/ [\u4ee3\u7801\u89e3\u6790]：\u5bf9\u8c61\u7684\u5b9e\u4f8b\u5316\u4e0e\u751f\u547d\u5468\u671f\u7ba1\u7406<\/span>
                          \n \/\/ \u8fd9\u91cc\u4f7f\u7528\u4e86 C++11 \u5f15\u5165\u7684 std::unique_ptr \u667a\u80fd\u6307\u9488\u6765\u5728\u5806\u533a\u521b\u5efa\u670d\u52a1\u5668\u5bf9\u8c61\u3002<\/span>
                          \n \/\/ \u91c7\u7528\u667a\u80fd\u6307\u9488\u7684\u6838\u5fc3\u4f18\u52bf\u662f RAII（\u8d44\u6e90\u83b7\u53d6\u5373\u521d\u59cb\u5316）\u673a\u5236：<\/span>
                          \n \/\/ \u5373\u4f7f\u670d\u52a1\u5668\u5728\u672a\u6765\u8fd0\u884c\u4e2d\u629b\u51fa\u5f02\u5e38\u5bfc\u81f4\u610f\u5916\u9000\u51fa，unique_ptr \u4e5f\u4f1a\u5728\u51fa\u4f5c\u7528\u57df\u65f6<\/span>
                          \n \/\/ \u81ea\u52a8\u8c03\u7528 selectServer \u7684\u6790\u6784\u51fd\u6570，\u786e\u4fdd\u5e95\u5c42\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u7b49\u7cfb\u7edf\u8d44\u6e90\u88ab\u5b89\u5168\u91ca\u653e\u3002<\/span>
                          \n std::<\/span>unique_ptr<<\/span>selectServer><\/span> select_server =<\/span> std::<\/span>make_unique<\/span><<\/span>selectServer><\/span><\/span><\/span>(<\/span>gport)<\/span>;<\/span><\/p>\n

                          \/\/ [\u4ee3\u7801\u89e3\u6790]：\u542f\u52a8\u4e8b\u4ef6\u5faa\u73af（Event Loop）<\/span>
                          \n \/\/ \u8c03\u7528 Start() \u540e，\u4e3b\u7ebf\u7a0b\u7684\u4ee3\u7801\u6267\u884c\u6d41\u5c06\u8fdb\u5165 selectServer \u7c7b\u5185\u90e8\u7684 while(true) \u6b7b\u5faa\u73af\u3002<\/span>
                          \n \/\/ \u670d\u52a1\u5668\u4ece\u6b64\u523b\u8d77\u6b63\u5f0f\u5f00\u59cb\u8fd0\u8f6c，\u6301\u7eed\u4e0d\u65ad\u5730\u6267\u884c "\u91cd\u7f6e\u4f4d\u56fe -> select\u7b49\u5f85 -> \u5904\u7406\u5c31\u7eea\u4e8b\u4ef6" \u7684\u95ed\u73af\u903b\u8f91\u3002<\/span>
                          \n \/\/ \u9664\u975e\u6536\u5230\u4e2d\u65ad\u4fe1\u53f7（\u5982 Ctrl+C）\u6216\u5185\u90e8\u53d1\u751f\u81f4\u547d\u9519\u8bef\u8c03\u7528 exit()，\u5426\u5219\u7a0b\u5e8f\u5c06\u6c38\u8fdc\u963b\u585e\u8fd0\u884c\u5728\u6b64\u5904\u3002<\/span>
                          \n select_server-><\/span>Start<\/span>(<\/span>)<\/span>;<\/span><\/p>\n

                          return<\/span> 0<\/span>;<\/span>
                          \n}<\/span><\/p>\n

                          5.4 \u4ee3\u7801\u89e3\u8bfb<\/h3>\n
                        • \u8f85\u52a9\u6570\u7ec4\u7684\u4f5c\u7528：arr_fds\u6570\u7ec4\u662f\u6574\u4e2aselect\u670d\u52a1\u5668\u7684\u6838\u5fc3\u3002\u5b83\u4fdd\u5b58\u4e86\u6240\u6709\u6211\u4eec\u8981\u76d1\u542c\u7684 fd，\u5305\u62ec\u76d1\u542c socket \u548c\u6240\u6709\u5ba2\u6237\u7aef\u8fde\u63a5\u7684 socket\u3002\u6bcf\u6b21\u8c03\u7528select\u524d，\u6211\u4eec\u90fd\u8981\u4ece\u8fd9\u4e2a\u6570\u7ec4\u4e2d\u628a\u6240\u6709\u6709\u6548 fd \u91cd\u65b0\u6dfb\u52a0\u5230fd_set\u4e2d\u3002<\/li>\n
                        • \u4e3a\u4ec0\u4e48 accept \u4e0d\u4f1a\u963b\u585e：\u56e0\u4e3aselect\u8fd4\u56de\u65f6，\u5df2\u7ecf\u544a\u8bc9\u6211\u4eec\u76d1\u542c socket \u4e0a\u6709\u65b0\u8fde\u63a5\u5230\u6765\u4e86\u3002\u6b64\u65f6\u8c03\u7528accept，\u5185\u6838\u4e2d\u5df2\u7ecf\u6709\u5b8c\u6210\u4e09\u6b21\u63e1\u624b\u7684\u8fde\u63a5\u5728\u5168\u8fde\u63a5\u961f\u5217\u4e2d\u7b49\u5f85\u4e86，\u6240\u4ee5accept\u4f1a\u7acb\u5373\u8fd4\u56de，\u4e0d\u4f1a\u963b\u585e\u3002<\/li>\n
                        • \u65b0\u8fde\u63a5\u7684\u5904\u7406：\u5f53\u6211\u4eec\u5f97\u5230\u4e00\u4e2a\u65b0\u7684\u8fde\u63a5 fd \u540e，\u53ea\u9700\u8981\u628a\u5b83\u6dfb\u52a0\u5230\u8f85\u52a9\u6570\u7ec4\u4e2d\u5373\u53ef\u3002\u4e0b\u4e00\u6b21\u5faa\u73af\u65f6，\u8fd9\u4e2a fd \u5c31\u4f1a\u88ab\u81ea\u52a8\u6dfb\u52a0\u5230select\u7684\u76d1\u542c\u96c6\u5408\u4e2d，select\u5c31\u4f1a\u5f00\u59cb\u76d1\u542c\u8fd9\u4e2a fd \u4e0a\u7684\u8bfb\u4e8b\u4ef6\u3002<\/li>\n

                          5.5 \u7f16\u8bd1\u8fd0\u884c<\/h3>\n

                          \u7f16\u8bd1\u8fd0\u884c\u8fd9\u4e2a\u670d\u52a1\u5668，\u7136\u540e\u7528\u591a\u4e2a telnet \u5ba2\u6237\u7aef\u8fde\u63a5，\u4f60\u4f1a\u770b\u5230\u670d\u52a1\u5668\u6210\u529f\u63a5\u53d7\u4e86\u6240\u6709\u8fde\u63a5：<\/p>\n

                          \"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"<\/p>\n

                          \n

                          \u7ed3\u5c3e：<\/h2>\n

                          🍓 \u6211\u662f\u8349\u8393\u718a Lotso！\u82e5\u8fd9\u7bc7\u6280\u672f\u5e72\u8d27\u5e2e\u4f60\u6253\u901a\u4e86\u5b66\u4e60\u4e2d\u7684\u5361\u70b9：
                          \n👀 \u3010\u5173\u6ce8\u3011\u8ddf\u6211\u4e00\u8d77\u6df1\u8015\u6280\u672f\u9886\u57df，\u4ece\u57fa\u7840\u5230\u8fdb\u9636，\u89c1\u8bc1\u6bcf\u4e00\u6b21\u6210\u957f
                          \n\u2764\ufe0f \u3010\u70b9\u8d5e\u3011\u8ba9\u4f18\u8d28\u5185\u5bb9\u88ab\u66f4\u591a\u4eba\u770b\u89c1，\u8ba9\u77e5\u8bc6\u4f20\u9012\u66f4\u6709\u529b\u91cf
                          \n\u2b50 \u3010\u6536\u85cf\u3011\u628a\u6838\u5fc3\u77e5\u8bc6\u70b9\u3001\u5b9e\u6218\u6280\u5de7\u5b58\u597d，\u9700\u8981\u65f6\u76f4\u63a5\u67e5\u3001\u968f\u65f6\u7528
                          \n💬 \u3010\u8bc4\u8bba\u3011\u5206\u4eab\u4f60\u7684\u7ecf\u9a8c\u6216\u7591\u95ee（\u6bd4\u5982\u66fe\u8e29\u8fc7\u7684\u6280\u672f\u5751？），\u4e00\u8d77\u4ea4\u6d41\u907f\u5751
                          \n🗳\ufe0f \u3010\u6295\u7968\u3011\u7528\u4f60\u7684\u9009\u62e9\u52a9\u529b\u793e\u533a\u5185\u5bb9\u65b9\u5411，\u544a\u8bc9\u5927\u5bb6\u54ea\u4e2a\u6280\u672f\u70b9\u6700\u8be5\u91cd\u70b9\u62c6\u89e3
                          \n\u6280\u672f\u4e4b\u8def\u96be\u514d\u6709\u56f0\u60d1，\u4f46\u540c\u884c\u7684\u4eba\u4f1a\u8ba9\u524d\u8fdb\u66f4\u6709\u65b9\u5411～\u613f\u6211\u4eec\u90fd\u80fd\u5728\u81ea\u5df1\u4e13\u6ce8\u7684\u9886\u57df\u91cc，\u4e00\u6b65\u6b65\u9760\u8fd1\u5fc3\u4e2d\u7684\u6280\u672f\u76ee\u6807！<\/p>\n

                          \u7ed3\u8bed：\u672c\u6587\u4ece\u591a\u8def\u8f6c\u63a5\u7684\u672c\u8d28\u51fa\u53d1，\u8be6\u7ec6\u8bb2\u89e3\u4e86select\u51fd\u6570\u7684\u6bcf\u4e00\u4e2a\u53c2\u6570\u548c\u5de5\u4f5c\u539f\u7406，\u5e76\u901a\u8fc7\u5b9e\u6218\u4ee3\u7801\u5b9e\u73b0\u4e86\u4e00\u4e2a\u80fd\u591f\u63a5\u53d7\u591a\u4e2a\u8fde\u63a5\u7684select\u670d\u52a1\u5668\u3002\u76ee\u524d\u8fd9\u4e2a\u670d\u52a1\u5668\u8fd8\u53ea\u662f\u4e00\u4e2a\u9aa8\u67b6，\u5b83\u53ea\u80fd\u63a5\u53d7\u65b0\u8fde\u63a5，\u8fd8\u4e0d\u80fd\u5904\u7406\u5ba2\u6237\u7aef\u53d1\u9001\u7684\u6570\u636e\u3002\u5728\u4e0b\u4e00\u7bc7\u6587\u7ae0\u4e2d，\u6211\u4eec\u4f1a\u7ee7\u7eed\u5b8c\u5584\u8fd9\u4e2a\u670d\u52a1\u5668，\u6dfb\u52a0\u5ba2\u6237\u7aef\u6570\u636e\u7684\u8bfb\u5199\u529f\u80fd，\u540c\u65f6\u8bb2\u89e3\u5982\u4f55\u5904\u7406\u5ba2\u6237\u7aef\u65ad\u5f00\u8fde\u63a5\u7684\u60c5\u51b5，\u4ee5\u53ca\u5982\u4f55\u4f18\u5316select\u7684\u4e8b\u4ef6\u5904\u7406\u903b\u8f91\u3002\u867d\u7136select\u6709\u5f88\u591a\u7f3a\u70b9，\u4f46\u5b83\u662f\u7406\u89e3 IO \u591a\u8def\u590d\u7528\u7684\u57fa\u7840\u3002\u638c\u63e1\u4e86select，\u4f60\u518d\u53bb\u5b66\u4e60poll\u548cepoll\u5c31\u4f1a\u975e\u5e38\u8f7b\u677e\u3002\u5982\u679c\u4f60\u89c9\u5f97\u8fd9\u7bc7\u6587\u7ae0\u5bf9\u4f60\u6709\u5e2e\u52a9，\u6b22\u8fce\u70b9\u8d5e\u3001\u6536\u85cf\u3001\u5173\u6ce8，\u6211\u4eec\u4e0b\u671f\u518d\u89c1！<\/font><\/p>\n

                          \u2728\u628a\u8fd9\u4e9b\u5185\u5bb9\u5403\u900f\u8d85\u725b\u7684！\u653e\u677e\u4e0b\u5427\u2728 <\/font><\/p>\n

                          \u0295\u02d8\u1d25\u02d8\u0294 <\/font><\/p>\n

                          \u3065\u304d\u3089\u3069 <\/font><\/p>\n

                          \"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"<\/p>\n","protected":false},"excerpt":{"rendered":"

                          🔥\u8349\u8393\u718aLotso：\u4e2a\u4eba\u4e3b\u9875 \u2744\ufe0f\u4e2a\u4eba\u4e13\u680f: \u300aC\u77e5\u8bc6\u5206\u4eab\u300b \u300aLinux \u5165\u95e8\u5230\u5b9e\u8df5：\u96f6\u57fa\u7840\u4e5f\u80fd\u61c2\u300b \u2728\u751f\u6d3b\u662f\u9ed8\u9ed8\u7684\u575a\u6301，\u6bc5\u529b\u662f\u6c38\u4e45\u7684\u4eab\u53d7！ 🎬 \u535a\u4e3b\u7b80\u4ecb： \u6587\u7ae0\u76ee\u5f55\u524d\u8a00\u4e00. \u591a\u8def\u8f6c\u63a5\u7684\u672c\u8d28：\u628a \\”\u7b49\\” \u548c \\”\u62f7\u8d1d\\” \u5206\u5f001.1 \u4ec0\u4e48\u662f \\”\u6761\u4ef6\u5c31\u7eea\\”1.2 \u5e38\u89c1\u591a\u8def\u590d\u7528\u65b9\u6848\u5bf9\u6bd4\u4e8c. select \u51fd\u6570\u8be6\u89e32.1 \u53c2\u6570\u8be6\u89e32.2 \u8fd4\u56de\u503c\u4e09. socket \u5c31\u7eea\u6761<\/p>\n","protected":false},"author":2,"featured_media":83760,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[9099,58,100,43,78,44],"topic":[],"class_list":["post-83769","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-server","tag-9099","tag-linux","tag-100","tag-43","tag-78","tag-44"],"yoast_head":"\n\u3010Linux\u7f51\u7edc\u3011\u6df1\u5165\u7406\u89e3Linux IO\u591a\u8def\u590d\u7528\uff1a\u4ece\u672c\u8d28\u5230select\u670d\u52a1\u5668\u5b9e\u6218 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.wsisp.com\/helps\/83769.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u3010Linux\u7f51\u7edc\u3011\u6df1\u5165\u7406\u89e3Linux IO\u591a\u8def\u590d\u7528\uff1a\u4ece\u672c\u8d28\u5230select\u670d\u52a1\u5668\u5b9e\u6218 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"og:description\" content=\"🔥\u8349\u8393\u718aLotso：\u4e2a\u4eba\u4e3b\u9875 \u2744\ufe0f\u4e2a\u4eba\u4e13\u680f: \u300aC\u77e5\u8bc6\u5206\u4eab\u300b \u300aLinux \u5165\u95e8\u5230\u5b9e\u8df5：\u96f6\u57fa\u7840\u4e5f\u80fd\u61c2\u300b \u2728\u751f\u6d3b\u662f\u9ed8\u9ed8\u7684\u575a\u6301，\u6bc5\u529b\u662f\u6c38\u4e45\u7684\u4eab\u53d7！ 🎬 \u535a\u4e3b\u7b80\u4ecb： \u6587\u7ae0\u76ee\u5f55\u524d\u8a00\u4e00. \u591a\u8def\u8f6c\u63a5\u7684\u672c\u8d28：\u628a "\u7b49" \u548c "\u62f7\u8d1d" \u5206\u5f001.1 \u4ec0\u4e48\u662f "\u6761\u4ef6\u5c31\u7eea"1.2 \u5e38\u89c1\u591a\u8def\u590d\u7528\u65b9\u6848\u5bf9\u6bd4\u4e8c. select \u51fd\u6570\u8be6\u89e32.1 \u53c2\u6570\u8be6\u89e32.2 \u8fd4\u56de\u503c\u4e09. socket \u5c31\u7eea\u6761\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.wsisp.com\/helps\/83769.html\" \/>\n<meta property=\"og:site_name\" content=\"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"article:published_time\" content=\"2026-07-25T20:25:38+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/07\/20260725202528-6a651bb855e0d.jpg\" \/>\n<meta name=\"author\" content=\"admin\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u4f5c\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"admin\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4\" \/>\n\t<meta name=\"twitter:data2\" content=\"7 \u5206\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/83769.html\",\"url\":\"https:\/\/www.wsisp.com\/helps\/83769.html\",\"name\":\"\u3010Linux\u7f51\u7edc\u3011\u6df1\u5165\u7406\u89e3Linux IO\u591a\u8def\u590d\u7528\uff1a\u4ece\u672c\u8d28\u5230select\u670d\u52a1\u5668\u5b9e\u6218 - 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