{"id":109098,"date":"2026-09-23T10:57:19","date_gmt":"2026-09-23T02:57:19","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/109098.html"},"modified":"2026-09-23T10:57:19","modified_gmt":"2026-09-23T02:57:19","slug":"linux%e8%bf%9b%e9%98%b6%e7%9f%a5%e8%af%861-0","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/109098.html","title":{"rendered":"Linux\u8fdb\u9636\u77e5\u8bc61.0"},"content":{"rendered":"

\"\" <\/p>\n

@bit::Shadow
\n \u2727(\u2256 \u25e1 \u2256\u273f\u00a0<\/p>\n

\u76ee\u5f55<\/p>\n

\u5206\u53f7；\u4e0d\u8bba\u4e0a\u4e00\u4e2a\u6307\u4ee4\u6267\u884c\u662f\u5426\u6210\u529f\u5747\u4f1a\u6267\u884c\u4e0b\u4e00\u4e2a\u6307\u4ee4<\/p>\n

\u903b\u8f91\u4e0e\u7b26\u53f7&&\u53ea\u6709\u5f53\u4e0a\u4e00\u4e2a\u547d\u4ee4\u6267\u884c\u6210\u529f\u624d\u4f1a\u6267\u884c\u4e0b\u4e00\u4e2a\u6307\u4ee4<\/p>\n

\u5b50\u8fdb\u7a0b\u7ee7\u627f\u7236\u8fdb\u7a0b\u7684\u4fe1\u53f7\u5904\u7406\u52a8\u4f5c？\u50cf\u5ffd\u7565\u4fe1\u53f7\u52a8\u4f5c？<\/p>\n

\u5b50\u8fdb\u7a0b\u7ee7\u627f\u7236\u8fdb\u7a0b\u7684\u4fe1\u53f7\u5904\u7406<\/p>\n

\u5b88\u62a4\u8fdb\u7a0b<\/p>\n

\u8bbe\u5907\u6587\u4ef6 \/dev\/null<\/p>\n

ss -tan | head-n1; ss-tan | grep 8080<\/p>\n

\u4e8c\u3001Recv-Q（\u63a5\u6536\u961f\u5217）<\/p>\n

\u4e09\u3001Send-Q（\u53d1\u9001\u961f\u5217）<\/p>\n

\u5b57\u6bb5 peer Addres：\u5bf9\u7aef\u5730\u5740<\/p>\n

\u53f3\u503c=<\/p>\n

Switch\u7684\u9519\u8bef\u7528\u6cd5<\/p>\n

\n

\u5206\u53f7；\u4e0d\u8bba\u4e0a\u4e00\u4e2a\u6307\u4ee4\u6267\u884c\u662f\u5426\u6210\u529f\u5747\u4f1a\u6267\u884c\u4e0b\u4e00\u4e2a\u6307\u4ee4<\/h2>\n

\u903b\u8f91\u4e0e\u7b26\u53f7&&\u53ea\u6709\u5f53\u4e0a\u4e00\u4e2a\u547d\u4ee4\u6267\u884c\u6210\u529f\u624d\u4f1a\u6267\u884c\u4e0b\u4e00\u4e2a\u6307\u4ee4<\/h2>\n

\"\"\"\"<\/p>\n

\u5b50\u8fdb\u7a0b\u7ee7\u627f\u7236\u8fdb\u7a0b\u7684\u4fe1\u53f7\u5904\u7406\u52a8\u4f5c？\u50cf\u5ffd\u7565\u4fe1\u53f7\u52a8\u4f5c？<\/h2>\n

\u5b50\u8fdb\u7a0b\u7ee7\u627f\u7236\u8fdb\u7a0b\u7684\u4fe1\u53f7\u5904\u7406<\/h3>\n

\u662f\u7684，\u5b50\u8fdb\u7a0b\u4f1a\u7ee7\u627f\u7236\u8fdb\u7a0b\u7684\u4fe1\u53f7\u5904\u7406\u52a8\u4f5c，\u5305\u62ec\u5ffd\u7565（SIG_IGN）\u3001\u81ea\u5b9a\u4e49\u5904\u7406\u51fd\u6570\u548c\u9ed8\u8ba4\u884c\u4e3a\u3002\u8fd9\u662f\u4e00\u4e2a\u975e\u5e38\u91cd\u8981\u7684\u7279\u6027\u3002<\/p>\n

\u5b88\u62a4\u8fdb\u7a0b<\/h3>\n

\/*\u5b88\u62a4\u8fdb\u7a0b\u8bd1\u4f5c：daemon (dei men)*\/
\nconst char *workpath = "\/";
\nvoid Daemon (int cdir, int noclose)
\n{
\n \/\/\u89e3\u51b3IO\u95ee\u9898
\n signal (SIGCHLD, SIG_IGN);
\n signal (SIGPIPE, SIG_IGN);<\/p>\n

if (fork () > 0)
\n exit (0);
\n \/\/\u5b50\u8fdb\u7a0b\u521b\u5efa\u4f5c\u4e3a\u65b0\u4f1a\u8bdd\u7ec4\u7ec4\u957f
\n pid_t ret = setsid ();
\n if(ret < 0)
\n RETFATAL ("setsid");<\/p>\n

\/\/\u5de5\u4f5c\u8def\u5f84\u662f\u5426\u5207\u6362？(\u5373\u5b88\u62a4\u8fdb\u7a0b\u8fd0\u884c\u7684\u8def\u5f84)
\n if(cdir == 0)
\n chdir (workpath);
\n \/\/ \u91cd\u5b9a\u5411\u6807\u51c6\u8f93\u5165\u3001\u6807\u51c6\u8f93\u51fa\u3001\u6807\u51c6\u9519\u8bef\u5230my.log\u6587\u4ef6(\u65e5\u5fd7\u6587\u4ef6)
\n \/\/ \u8fd9\u6837\u505a\u7684\u8981\u6c42\u662f\u5b88\u62a4\u8fdb\u7a0b\u7279\u5f81(\u9ed8\u8ba4\u5173\u95ed\u7ec8\u7aef)
\n if(noclose == 0)
\n {
\n int fd = open ("\/my.log", O_RDWR);\/\/\u8bfb\u5199
\n if(fd < 0)
\n RETFATAL ("open");
\n int ret1 = dup2 (fd, 0);
\n int ret2 = dup2 (fd, 1);
\n int ret3 = dup2 (fd, 2);
\n if(ret1 < 0 || ret2 < 0 || ret3 < 0)
\n RETFATAL ("dup2");<\/p>\n

\/\/\u6253\u5f00\u7684fd\u9700\u8981\u5173\u95ed\u5417？—>\u5173\u95ed\u540e\u4f1a\u5f71\u54cd\u5199\u5165\u5417？\u4e0d\u4f1a！！！
\n int ret4 = close (fd);
\n if(ret4 < 0)
\n RETFATAL ("close");
\n }
\n} <\/p>\n

\u8bbe\u5907\u6587\u4ef6 \/dev\/null<\/h2>\n

\"\"<\/p>\n

\u51e1\u662f\u5199\u5165\u5230\u8fd9\u4e2a\u6587\u4ef6\u5185\u7684\u5185\u5bb9，\u5747\u88ab\u4e22\u5f03\u3002 \u51e1\u662f\u4ece\u8be5\u6587\u4ef6\u8bfb\u53d6\u7684\u5185\u5bb9，\u5747\u662f\u7a7a\u3002\u00a0<\/p>\n

ss -tan | head-n1; ss-tan | grep 8080<\/h2>\n

"\u5e26\u8868\u5934\u5730"\u5217\u51fa\u5f53\u524d\u6240\u6709\u548c 8080 \u6709\u5173\u7684 TCP \u8fde\u63a5\u3002<\/p>\n

\"\"<\/p>\n

\u7b2c\u4e09\u884c\u56db\u884c\u662f\u56e0\u4e3a\u201c\u672c\u5730\u56de\u73af\u201d\u7684\u539f\u56e0\u5f62\u6210\u4e86\u4e00\u5bf9\u94fe\u63a5\u3002<\/p>\n

\u4e8c\u3001Recv-Q（\u63a5\u6536\u961f\u5217）<\/h3>\n

\u5f53\u524d\u8fd9\u4e2a socket \u7684\u63a5\u6536\u7f13\u51b2\u533a\u91cc，\u8fd8\u6709\u591a\u5c11\u5b57\u8282\u6ca1\u88ab\u5e94\u7528\u5c42\u8bfb\u8d70<\/span>\u3002<\/p>\n\n\u72b6\u6001\u542b\u4e49<\/tr>\n\n\n\n
LISTEN<\/td>\n\u5df2\u5b8c\u6210\u4e09\u6b21\u63e1\u624b\u3001\u4f46\u8fd8\u6ca1\u88ab accept \u53d6\u8d70\u7684\u8fde\u63a5\u6570（backlog \u961f\u5217\u91cc\u5806\u79ef\u7684\u91cf）<\/td>\n<\/tr>\n
ESTAB<\/td>\n\u5df2\u6536\u5230\u4f46\u5e94\u7528\u8fd8\u6ca1\u00a0recv\u00a0\u7684\u6570\u636e\u5b57\u8282\u6570<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u4f60\u7684\u8f93\u51fa：<\/p>\n

    \n
  • \n

    LISTEN\u00a0\u7684 Recv-Q =\u00a00\u00a0\u2192 \u6ca1\u6709\u79ef\u538b\u7684\u672a accept \u8fde\u63a5，accept\u00a0\u5f88\u53ca\u65f6<\/p>\n<\/li>\n

  • \n

    \u6240\u6709 ESTAB \u7684 Recv-Q =\u00a00\u00a0\u2192 \u6ca1\u6709\u672a\u8bfb\u6570\u636e，\u5e94\u7528\u8bfb\u5f97\u5f88\u5e72\u51c0<\/p>\n<\/li>\n<\/ul>\n

    \u5982\u679c LISTEN \u7684 Recv-Q \u6301\u7eed > 0，\u8bf4\u660e\u00a0accept\u00a0\u592a\u6162\u6216\u6ca1\u8c03\u7528，\u8fde\u63a5\u5728\u6392\u961f\u3002<\/p>\n

    \n

    \u4e09\u3001Send-Q（\u53d1\u9001\u961f\u5217）<\/h3>\n\n\u72b6\u6001\u542b\u4e49<\/tr>\n\n\n\n
    LISTEN<\/td>\nlisten() \u4f20\u5165\u7684 backlog \u503c（\u5185\u6838\u53ef\u80fd\u622a\u65ad）<\/td>\n<\/tr>\n
    ESTAB<\/td>\n\u5df2\u53d1\u7ed9\u5bf9\u65b9\u4f46\u8fd8\u6ca1\u6536\u5230 ACK\u00a0\u7684\u5b57\u8282\u6570<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    \u4f60\u7684\u8f93\u51fa：<\/p>\n

      \n
    • \n

      LISTEN\u00a0\u7684 Send-Q =\u00a04\u00a0\u2192 \u4f60\u00a0listen()\u00a0\u65f6 backlog \u4f20\u7684\u662f 4（\u5f88\u5c0f，\u901a\u5e38\u4f20\u00a0SOMAXCONN\u00a0\u5373 128 \u6216\u66f4\u5927）<\/p>\n<\/li>\n

    • \n

      \u6240\u6709 ESTAB \u7684 Send-Q =\u00a00\u00a0\u2192 \u53d1\u51fa\u53bb\u7684\u6570\u636e\u90fd\u88ab\u786e\u8ba4\u4e86，\u6ca1\u6709\u5f85\u786e\u8ba4<\/p>\n<\/li>\n<\/ul>\n

      \u6ce8\u610f：LISTEN \u72b6\u6001\u4e0b Send-Q \u4e0d\u662f"\u5f85\u53d1\u9001\u6570\u636e"，\u800c\u662f backlog\u3002\u00a0\u8fd9\u662f\u5f88\u591a\u4eba\u8bef\u89e3\u7684\u5730\u65b9\u3002<\/p>\n

      \u5b57\u6bb5 peer Addres：\u5bf9\u7aef\u5730\u5740<\/h3>\n

      \u53f3\u503c=<\/h2>\n

      \u53f3\u503c\u5728=\u53f3\u4fa7\u662f\u201c\u62f7\u8d1d\u8fdb\u884c\u201d\u7684，\u4e0d\u662f\u201c\u53f3\u503c\u5728\u53f3\u201d\u6240\u4ee5\u6ca1\u95ee\u9898<\/p>\n

      \"\"<\/p>\n

      Switch\u7684\u9519\u8bef\u7528\u6cd5<\/h2>\n

      const int rnum = epoll_wait (_epollfd, _ep, epoll_arr_maxsize, timeout);<\/p>\n

      switch (rnum)
      \n{
      \ncase (bool)(rnum > 0):
      \n \/* code *\/
      \n break;<\/p>\n

      default:
      \n break;
      \n} <\/p>\n

      case\u540e\u5fc5\u987b\u662f\u201c\u7f16\u8bd1\u671f\u6574\u578b\u5e38\u91cf\u8868\u8fbe\u5f0f\u201d\u3002<\/p>\n

        \n
      • \n

        (bool)(rnum > 0)\u00a0\u662f\u8fd0\u884c\u65f6<\/span>\u8ba1\u7b97\u7684\u503c，\u4e0d\u662f\u5e38\u91cf\u3002<\/p>\n<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"

        bit::Shadow\u2727(\u2256 \u25e1 \u2256\u273f\u00a0\u76ee\u5f55
        \n\u5206\u53f7；\u4e0d\u8bba\u4e0a\u4e00\u4e2a\u6307\u4ee4\u6267\u884c\u662f\u5426\u6210\u529f\u5747\u4f1a\u6267\u884c\u4e0b\u4e00\u4e2a\u6307\u4ee4
        \n\u903b\u8f91\u4e0e\u7b26\u53f7&&\u53ea\u6709\u5f53\u4e0a\u4e00\u4e2a\u547d\u4ee4\u6267\u884c\u6210\u529f\u624d\u4f1a\u6267\u884c\u4e0b\u4e00\u4e2a\u6307\u4ee4
        \n\u5b50\u8fdb\u7a0b\u7ee7\u627f\u7236\u8fdb\u7a0b\u7684\u4fe1\u53f7\u5904\u7406\u52a8\u4f5c？\u50cf\u5ffd\u7565\u4fe1\u53f7\u52a8\u4f5c？
        \n\u5b50\u8fdb\u7a0b\u7ee7\u627f\u7236\u8fdb\u7a0b\u7684\u4fe1\u53f7\u5904\u7406
        \n\u5b88\u62a4\u8fdb\u7a0b
        \n\u8bbe\u5907\u6587\u4ef6 \/dev\/null
        \nss -tan | head-n1; ss-tan | grep 8080
        \n\u4e8c\u3001Recv-Q（\u63a5\u6536\u961f\u5217）
        \n\u4e09\u3001Send<\/p>\n","protected":false},"author":2,"featured_media":109092,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[11653,58,43,44],"topic":[],"class_list":["post-109098","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-server","tag-11653","tag-linux","tag-43","tag-44"],"yoast_head":"\nLinux\u8fdb\u9636\u77e5\u8bc61.0 - \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\/109098.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Linux\u8fdb\u9636\u77e5\u8bc61.0 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"og:description\" content=\"bit::Shadow\u2727(\u2256 \u25e1 \u2256\u273f\u00a0\u76ee\u5f55 \u5206\u53f7；\u4e0d\u8bba\u4e0a\u4e00\u4e2a\u6307\u4ee4\u6267\u884c\u662f\u5426\u6210\u529f\u5747\u4f1a\u6267\u884c\u4e0b\u4e00\u4e2a\u6307\u4ee4 \u903b\u8f91\u4e0e\u7b26\u53f7&&\u53ea\u6709\u5f53\u4e0a\u4e00\u4e2a\u547d\u4ee4\u6267\u884c\u6210\u529f\u624d\u4f1a\u6267\u884c\u4e0b\u4e00\u4e2a\u6307\u4ee4 \u5b50\u8fdb\u7a0b\u7ee7\u627f\u7236\u8fdb\u7a0b\u7684\u4fe1\u53f7\u5904\u7406\u52a8\u4f5c？\u50cf\u5ffd\u7565\u4fe1\u53f7\u52a8\u4f5c？ \u5b50\u8fdb\u7a0b\u7ee7\u627f\u7236\u8fdb\u7a0b\u7684\u4fe1\u53f7\u5904\u7406 \u5b88\u62a4\u8fdb\u7a0b \u8bbe\u5907\u6587\u4ef6 \/dev\/null ss -tan | head-n1; 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