{"id":72218,"date":"2026-02-05T07:41:24","date_gmt":"2026-02-04T23:41:24","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/72218.html"},"modified":"2026-02-05T07:41:24","modified_gmt":"2026-02-04T23:41:24","slug":"%e3%80%90linux%e7%b3%bb%e7%bb%9f%e3%80%91%e6%96%87%e4%bb%b6io%ef%bc%9a%e7%90%86%e8%a7%a3%e6%96%87%e4%bb%b6%e6%8f%8f%e8%bf%b0%e7%ac%a6%e3%80%81%e9%87%8d%e5%ae%9a%e5%90%91%e3%80%81%e7%bc%93%e5%86%b2","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/72218.html","title":{"rendered":"\u3010Linux\u7cfb\u7edf\u3011\u6587\u4ef6IO\uff1a\u7406\u89e3\u6587\u4ef6\u63cf\u8ff0\u7b26\u3001\u91cd\u5b9a\u5411\u3001\u7f13\u51b2\u533a"},"content":{"rendered":"

\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \u5404\u4f4d\u8bfb\u8005\u5927\u4f6c\u597d，\u6211\u662f\u843d\u7fbd！\u4e00\u4e2a\u575a\u6301\u4e0d\u65ad\u5b66\u4e60\u8fdb\u6b65\u7684\u5b66\u751f\u3002 \u5982\u679c\u60a8\u89c9\u5f97\u6211\u7684\u6587\u7ae0\u8fd8\u4e0d\u9519，\u6b22\u8fce\u591a\u591a\u4e09\u8fde\u5206\u4eab\u4ea4\u6d41，\u4e00\u8d77\u5b66\u4e60\u8fdb\u6b65！<\/font><\/font> \u6b22\u8fce\u5173\u6ce8\u6211\u7684blog\u4e3b\u9875: \u843d\u7fbd\u7684\u843d\u7fbd<\/font><\/p>\n<\/p>\n

\u6587\u7ae0\u76ee\u5f55<\/h4>\n
    \n
  • \u4e00\u3001C\u8bed\u8a00\u4e2d\u7684\u6587\u4ef6IO\u64cd\u4f5c<\/li>\n
  • \u4e8c\u3001Linux\u4e2d\u7684\u6587\u4ef6IO\u7cfb\u7edf\u8c03\u7528<\/li>\n
  • \n
      \n
    • 1. open\u3001write\u3001close<\/li>\n<\/ul>\n<\/li>\n
    • \u4e09\u3001\u6587\u4ef6\u63cf\u8ff0\u7b26fd<\/li>\n
    • \n
        \n
      • 1. \u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u672c\u8d28<\/li>\n
      • 2. \u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u5206\u914d\u89c4\u5219<\/li>\n
      • 3. \u91cd\u5b9a\u5411<\/li>\n<\/ul>\n<\/li>\n
      • \u56db\u3001\u7f13\u51b2\u533a\u4e0e\u5237\u65b0\u64cd\u4f5c<\/li>\n
      • \n
          \n
        • 1. \u4e3a\u4ec0\u4e48\u8981\u6709\u7f13\u51b2\u533a<\/li>\n
        • 2. \u8bed\u8a00\u7ea7\u7f13\u51b2\u533a\u4e0e\u5185\u6838\u7ea7\u7f13\u51b2\u533a<\/li>\n
        • 3. \u5237\u65b0\u65b9\u5f0f<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n

          \u4e00\u3001C\u8bed\u8a00\u4e2d\u7684\u6587\u4ef6IO\u64cd\u4f5c<\/h2>\n

          \u5728\u5b66\u4e60C\u8bed\u8a00\u65f6，\u6211\u4eec\u4e86\u89e3\u8fc7\u4e00\u4e9b\u5173\u4e8e\u6587\u4ef6\u6253\u5f00\u5173\u95ed\u8bfb\u5199\u7684C\u5e93\u51fd\u6570：fopen fwrite fputs fread fclose fseek rewind ftell\u7b49\u7b49\u3002\u8be6\u89c1：\u3010C\u8bed\u8a00\u7bc7\u3011\u6587\u4ef6\u64cd\u4f5c<\/p>\n

          \u5176\u4e2d，\u503c\u5f97\u5173\u6ce8\u7684\u662ffopen\u51fd\u6570 \"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \u5b83\u7684\u7b2c\u4e00\u4e2a\u53c2\u6570\u662f\u6587\u4ef6\u540d，\u7b2c\u4e8c\u4e2a\u53c2\u6570\u662f\u6587\u4ef6\u7684\u6253\u5f00\u6a21\u5f0f，\u6709\u4ee5\u4e0b\u6a21\u5f0f\u53ca\u5176\u4f5c\u7528：<\/p>\n\n\u6587\u4ef6\u6253\u5f00\u6a21\u5f0f\u542b\u4e49\u5982\u679c\u6307\u5b9a\u6587\u4ef6\u4e0d\u5b58\u5728<\/tr>\n\n\n\n\n\n\n\n\n\n\n\n\n\n
          r（\u53ea\u8bfb）<\/td>\n\u4e3a\u4e86\u8f93\u5165\u6570\u636e，\u6253\u5f00\u4e00\u4e2a\u6587\u672c\u6587\u4ef6<\/td>\n\u8fd4\u56de\u7a7a\u6307\u9488<\/td>\n<\/tr>\n
          w（\u53ea\u5199）<\/td>\n\u4e3a\u4e86\u8f93\u51fa\u6570\u636e，\u6253\u5f00\u4e00\u4e2a\u6587\u672c\u6587\u4ef6<\/td>\n\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u6587\u4ef6（\u5982\u679c\u6587\u4ef6\u5b58\u5728，\u4f1a\u6e05\u7a7a\u539f\u5185\u5bb9）<\/td>\n<\/tr>\n
          a（\u8ffd\u52a0）<\/td>\n\u5411\u6587\u672c\u6587\u4ef6\u5c3e\u6dfb\u52a0\u6570\u636e<\/td>\n\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u6587\u4ef6<\/td>\n<\/tr>\n
          rb（\u53ea\u8bfb）<\/td>\n\u4e3a\u4e86\u8f93\u5165\u6570\u636e，\u6253\u5f00\u4e00\u4e2a\u4e8c\u8fdb\u5236\u6587\u4ef6<\/td>\n\u8fd4\u56de\u7a7a\u6307\u9488<\/td>\n<\/tr>\n
          wb（\u53ea\u5199）<\/td>\n\u4e3a\u4e86\u8f93\u51fa\u6570\u636e，\u6253\u5f00\u4e00\u4e2a\u4e8c\u8fdb\u5236\u6587\u4ef6<\/td>\n\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u6587\u4ef6<\/td>\n<\/tr>\n
          ab（\u8ffd\u52a0）<\/td>\n\u5411\u4e8c\u8fdb\u5236\u6587\u4ef6\u5c3e\u6dfb\u52a0\u6570\u636e<\/td>\n\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u6587\u4ef6<\/td>\n<\/tr>\n
          r+（\u8bfb\u5199）<\/td>\n\u4e3a\u4e86\u8bfb\u5199\u6570\u636e，\u6253\u5f00\u4e00\u4e2a\u6587\u672c\u6587\u4ef6<\/td>\n\u8fd4\u56de\u7a7a\u6307\u9488<\/td>\n<\/tr>\n
          w+（\u8bfb\u5199）<\/td>\n\u4e3a\u4e86\u8bfb\u5199\u6570\u636e，\u6253\u5f00\u4e00\u4e2a\u6587\u672c\u6587\u4ef6<\/td>\n\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u6587\u4ef6<\/td>\n<\/tr>\n
          a+（\u8bfb\u5199）<\/td>\n\u5728\u6587\u672c\u6587\u4ef6\u5c3e\u8bfb\u5199\u6570\u636e<\/td>\n\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u6587\u4ef6<\/td>\n<\/tr>\n
          rb+（\u8bfb\u5199）<\/td>\n\u4e3a\u4e86\u8bfb\u5199\u6570\u636e，\u6253\u5f00\u4e00\u4e2a\u4e8c\u8fdb\u5236\u6587\u4ef6<\/td>\n\u8fd4\u56de\u7a7a\u6307\u9488<\/td>\n<\/tr>\n
          wb+（\u8bfb\u5199）<\/td>\n\u4e3a\u4e86\u8bfb\u5199\u6570\u636e，\u521b\u5efa\u4e00\u4e2a\u4e8c\u8fdb\u5236\u6587\u4ef6<\/td>\n\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u6587\u4ef6<\/td>\n<\/tr>\n
          ab+（\u8bfb\u5199）<\/td>\n\u5728\u4e8c\u8fdb\u5236\u6587\u4ef6\u5c3e\u8bfb\u5199\u6570\u636e<\/td>\n\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u6587\u4ef6<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

          \u6700\u5e38\u7528\u7684\u5c31\u662fr(\u53ea\u8bfb) w(\u53ea\u5199) a(\u8ffd\u52a0)，\u5176\u4e2dw\u6a21\u5f0f\u4f1a\u5728\u6253\u5f00\u6587\u4ef6\u65f6\u6e05\u7a7a\u539f\u5185\u5bb9\u3002<\/p>\n

          \u6211\u4eec\u77e5\u9053，\u5927\u591a\u6570\u6587\u4ef6\u662f\u653e\u5728\u78c1\u76d8\u4e0a\u7684，\u6839\u636e\u51af\u8bfa\u4f9d\u66fc\u4f53\u7cfb\u89c4\u5219，\u5fc5\u987b\u5148\u628a\u6587\u4ef6\u4ece\u78c1\u76d8\u52a0\u8f7d\u5230\u5185\u5b58\u624d\u80fd\u88abCPU\u8bbf\u95ee，\u8fd9\u4e2a\u8fc7\u7a0b\u9700\u8981\u786c\u4ef6\u5c42\u9762\u7684 I\/O \u64cd\u4f5c\u652f\u6301，\u786c\u4ef6\u64cd\u4f5c\u4e00\u5b9a\u4e0d\u662f\u9760C\u8bed\u8a00\u5b8c\u6210\u7684，\u64cd\u4f5c\u7cfb\u7edf\u4e00\u5b9a\u4f1a\u63d0\u4f9b\u76f8\u5173\u7684\u7cfb\u7edf\u8c03\u7528！<\/p>\n

          \u4e8c\u3001Linux\u4e2d\u7684\u6587\u4ef6IO\u7cfb\u7edf\u8c03\u7528<\/h2>\n

          C\u8bed\u8a00\u4e2d，\u4e00\u5957\u6b63\u786e\u7684\u6587\u4ef6IO\u6d41\u7a0b\u662f：\u6253\u5f00\u6587\u4ef6\u3001\u8bfb\/\u5199\u5185\u5bb9\u3001\u5173\u95ed\u6587\u4ef6\u3002 \u5b9e\u9645\u4e0a，\u5728\u5176\u4ed6\u8bed\u8a00\u6216\u64cd\u4f5c\u7cfb\u7edf\u4e2d，\u57fa\u672c\u90fd\u662f\u8fd9\u6837\u7684\u6d41\u7a0b，\u5148\u6253\u5f00\u6587\u4ef6，\u518d\u8bfb\u5199，\u518d\u5173\u95ed！<\/p>\n

          1. open\u3001write\u3001close<\/h3>\n

          open： \u7cfb\u7edf\u8c03\u7528open，\u7528\u6765\u6253\u5f00\u4e00\u4e2a\u6587\u4ef6：<\/p>\n

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

            \n
          • \u7b2c\u4e00\u4e2a\u53c2\u6570pathname\u662f\u76ee\u6807\u6587\u4ef6<\/li>\n
          • \u7b2c\u4e09\u4e2a\u53c2\u6570mode\u53ef\u4ee5\u4e0d\u5e26，\u7528\u4e8e\u63a7\u5236\u6587\u4ef6\u6743\u9650，\u4f20\u9012\u4e00\u4e2a\u6743\u9650\u516b\u8fdb\u5236\u6570，\u5982\u4f20\u90120666，\u5b9e\u9645\u6587\u4ef6\u6743\u9650\u503c\u662f0666-\u6743\u9650\u63a9\u7801<\/li>\n
          • \u7b2c\u4e8c\u4e2a\u53c2\u6570\u662f\u6253\u5f00\u6587\u4ef6\u7684\u9009\u9879，\u9009\u9879\u662f\u5b8f\u5b9a\u4e49\u5e38\u91cf，\u540c\u65f6\u6709\u591a\u4e2a\u9009\u9879，\u9009\u9879\u4e4b\u95f4\u4ee5|（\u6216）\u8fde\u63a5，\u5e38\u89c1\u7684\u6709：\n
              \n
            • \u4ee5\u4e0b\u4e09\u4e2a\u9009\u9879\u5fc5\u987b\u6709\u4e14\u4ec5\u6709\u6307\u5b9a\u4e00\u4e2a：\n
                \n
              • O_RDONLY（\u53ea\u8bfb\u6253\u5f00）<\/li>\n
              • O_WRONLY（\u53ea\u5199\u6253\u5f00）<\/li>\n
              • O_RDWR（\u8bfb\u5199\u6253\u5f00）<\/li>\n<\/ul>\n<\/li>\n
              • \u4ee5\u4e0b\u9009\u9879\u53ef\u4ee5\u540c\u65f6\u6307\u5b9a：\n
                  \n
                • O_CREAT（\u82e5\u6307\u5b9a\u6587\u4ef6\u4e0d\u5b58\u5728\u5219\u521b\u5efa\u5b83，\u4f7f\u7528\u8be5\u9009\u9879\u65f6\u5fc5\u987b\u5e26mode\u53c2\u6570，\u5426\u5219\u65b0\u6587\u4ef6\u521d\u59cb\u6743\u9650\u662f\u4e71\u7684）<\/li>\n
                • O_APPEND（\u8ffd\u52a0\u5199\u6253\u5f00）<\/li>\n
                • O_TRUNC（\u6253\u5f00\u6587\u4ef6\u65f6\u6e05\u7a7a\u539f\u5185\u5bb9）<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n

                  open\u662f\u8fd4\u56de\u503c\u662f\u4e00\u4e2aint，\u5b83\u4ee3\u8868\u7740\u76ee\u6807\u6587\u4ef6\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26fd！\u8fd9\u4e2a\u6982\u5ff5\u4e00\u4f1a\u518d\u7ec6\u8bf4，\u76ee\u524d\u53ef\u4ee5\u7406\u89e3\u4e3a\u6807\u8bc6\u4e00\u4e2a\u6587\u4ef6\u7684\u6570\u5b57，\u6587\u4ef6\u63cf\u8ff0\u7b26\u662f\u4e00\u4e2a\u975e\u8d1f\u6574\u6570！ \u5982\u679copen\u8fd4\u56de\u503c\u5c0f\u4e8e0，\u8bf4\u660e\u6253\u5f00\u6587\u4ef6\u5931\u8d25\u3002<\/p>\n

                  write： \u7cfb\u7edf\u8c03\u7528write\u7684\u4f5c\u7528\u662f\u5411\u67d0\u4e2a\u6587\u4ef6\u4e2d\u5199\u5185\u5bb9：<\/p>\n

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

                    \n
                  • \u7b2c\u4e00\u4e2a\u53c2\u6570\u662f\u76ee\u6807\u6587\u4ef6\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26，\u7b2c\u4e8c\u4e2a\u53c2\u6570\u662f\u5f85\u5199\u5165\u7684\u6570\u636e，\u7b2c\u4e09\u4e2a\u53c2\u6570\u662f\u4f60\u60f3\u8981\u5199\u5165\u7684\u5b57\u8282\u6570\u3002<\/li>\n
                  • \u8fd4\u56de\u503c\u662f：\n
                      \n
                    • \u5199\u5165\u6210\u529f\u65f6，\u8fd4\u56de\u5b9e\u9645\u5199\u5165\u7684\u5b57\u8282\u6570（\u53ef\u80fd\u5c0f\u4e8e count，\u6bd4\u5982\u78c1\u76d8\u7a7a\u95f4\u4e0d\u8db3\u65f6）\u3002<\/li>\n
                    • \u5931\u8d25\u65f6，\u8fd4\u56de -1，\u5e76\u8bbe\u7f6e\u5168\u5c40\u53d8\u91cf errno \u6765\u6307\u793a\u9519\u8bef\u539f\u56e0\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n

                      close： \u7cfb\u7edf\u8c03\u7528close\u7528\u4e8e\u5173\u95ed\u4e00\u4e2a\u6587\u4ef6：<\/p>\n

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

                      \u53c2\u6570\u662f\u76ee\u6807\u6587\u4ef6\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26，\u5f88\u7b80\u5355\u3002<\/p>\n

                      \u6211\u4eec\u6f14\u793a\u4e00\u4e0b\u4f7f\u7528\u8fd9\u4e9b\u7cfb\u7edf\u8c03\u7528\u5b8c\u6210\u6587\u4ef6\u8bfb\u5199：<\/p>\n

                      #<\/span>include<\/span><stdio.h><\/span><\/span>
                      \n#<\/span>include<\/span><sys\/types.h><\/span><\/span>
                      \n#<\/span>include<\/span><sys\/stat.h><\/span><\/span>
                      \n#<\/span>include<\/span><fcntl.h><\/span><\/span>
                      \n#<\/span>include<\/span><unistd.h><\/span><\/span>
                      \n#<\/span>include<\/span><string.h><\/span><\/span><\/p>\n

                      int<\/span> main<\/span>(<\/span>)<\/span>
                      \n{<\/span>
                      \n umask<\/span>(<\/span>0000<\/span>)<\/span>;<\/span> \/\/ \u8bbe\u7f6e\u6743\u9650\u63a9\u7801<\/span>
                      \n int<\/span> fd =<\/span> open<\/span>(<\/span>"log.txt"<\/span>,<\/span> O_WRONLY|<\/span>O_CREAT,<\/span> 0644<\/span>)<\/span>;<\/span> \/\/ \u53ea\u8bfb\u6253\u5f00，\u82e5\u6587\u4ef6\u4e0d\u5b58\u5728\u5219\u521b\u5efa<\/span>
                      \n if<\/span>(<\/span>fd <<\/span> 0<\/span>)<\/span>
                      \n {<\/span>
                      \n perror<\/span>(<\/span>"\u6253\u5f00\u6587\u4ef6\u5931\u8d25"<\/span>)<\/span>;<\/span>
                      \n return<\/span> 1<\/span>;<\/span>
                      \n }<\/span><\/p>\n

                      const<\/span> char<\/span>*<\/span> msg =<\/span> "hello!\\\\n"<\/span>;<\/span>
                      \n write<\/span>(<\/span>fd,<\/span> msg,<\/span> strlen<\/span>(<\/span>msg)<\/span>)<\/span>;<\/span><\/p>\n

                      close<\/span>(<\/span>fd)<\/span>;<\/span><\/p>\n

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

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

                      \u7cfb\u7edf\u8c03\u7528\u8fd8\u6709read\u3001lseek\u7b49\u7b49\u3002\u6b64\u65f6\u6211\u4eec\u53ef\u4ee5\u521d\u6b65\u5f97\u51fa\u7ed3\u8bba：C\u5e93\u51fd\u6570fopen\u3001fwrite\u3001fread\u3001fclose\u3001fseek\u7b49，\u672c\u8d28\u90fd\u662f\u5c01\u88c5\u4e86\u76f8\u5e94\u7684\u7cfb\u7edf\u8c03\u7528open\u3001write\u3001read\u3001close\u3001lseek\u7b49！<\/p>\n

                      \u4e09\u3001\u6587\u4ef6\u63cf\u8ff0\u7b26fd<\/h2>\n

                      1. \u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u672c\u8d28<\/h3>\n

                      \u6587\u4ef6\u63cf\u8ff0\u7b26，\u662f\u4e00\u4e2a\u975e\u8d1f\u6574\u6570\u3002 Linux\u8fdb\u7a0b\u9ed8\u8ba4\u60c5\u51b5\u4e0b\u4f1a\u6709\u4e09\u4e2a\u81ea\u52a8\u6253\u5f00\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26，\u5206\u522b\u662f：stdin\u6807\u51c6\u8f93\u51650\u3001stdout\u6807\u51c6\u8f93\u51fa1\u3001stderr\u6807\u51c6\u9519\u8bef2，\u5bf9\u5e94\u7684\u7269\u7406\u8bbe\u5907\u662f：\u952e\u76d8\u3001\u663e\u793a\u5668\u3001\u663e\u793a\u5668\u3002Linux\u4e2d\u4e00\u5207\u7686\u6587\u4ef6，\u4ece\u952e\u76d8\u6253\u5b57\u5c31\u662f\u4ece\u952e\u76d8\u6587\u4ef6\u4e2d\u8bfb\u53d6\u6570\u636e\u3001\u663e\u793a\u5668\u663e\u793a\u5c31\u662f\u5c06\u6570\u636e\u5199\u5230\u663e\u793a\u5668\u6587\u4ef6\u4e2d！<\/p>\n

                      \u6240\u4ee5，\u6211\u4eec\u60f3\u4ece\u952e\u76d8\u8bfb\u53d6\u6570\u636e，\u5728\u5c4f\u5e55\u4e0a\u6253\u5370\u51fa\u6765，\u4e5f\u53ef\u4ee5\u8fd9\u6837\u5b9e\u73b0：<\/p>\n

                      char<\/span> buf[<\/span>16<\/span>]<\/span>;<\/span>
                      \nssize_t<\/span> s =<\/span> read<\/span>(<\/span>0<\/span>,<\/span> buf,<\/span> sizeof<\/span>(<\/span>buf)<\/span>)<\/span>;<\/span> \/\/ \u4ece0\u53f7\u6587\u4ef6（\u6807\u51c6\u8f93\u5165，\u4e5f\u5c31\u662f\u952e\u76d8）\u4e2d\u8bfb\u53d6<\/span>
                      \nif<\/span>(<\/span>s ><\/span> 0<\/span>)<\/span>
                      \n{<\/span>
                      \nbuf[<\/span>s]<\/span> =<\/span> '\\\\0'<\/span>;<\/span>
                      \nwrite<\/span>(<\/span>1<\/span>,<\/span> buf,<\/span> strlen<\/span>(<\/span>buf)<\/span>)<\/span>;<\/span> \/\/ \u5199\u51651\u53f7\u6587\u4ef6（\u6807\u51c6\u8f93\u51fa1，\u4e5f\u5c31\u662f\u663e\u793a\u5668）<\/span>
                      \n}<\/span><\/p>\n

                      \u4e00\u4e2a\u8fdb\u7a0b\u53ef\u4ee5\u6253\u5f00\u591a\u4e2a\u6587\u4ef6，\u6bcf\u4e2a\u6587\u4ef6\u7684\u72b6\u6001\u53ef\u80fd\u90fd\u4e0d\u4e00\u6837，\u6240\u4ee5\u8fdb\u7a0b\u4e00\u5b9a\u9700\u8981\u7ba1\u7406\u6587\u4ef6！\u5f53\u6211\u4eec\u6253\u5f00\u6587\u4ef6\u65f6，\u64cd\u4f5c\u7cfb\u7edf\u8981\u5728\u5185\u5b58\u4e2d\u521b\u5efa\u76f8\u5e94\u7684\u6570\u636e\u7ed3\u6784\u6765\u63cf\u8ff0\u7ec4\u7ec7\u6587\u4ef6，\u4e8e\u662f\u5c31\u53ef\u4ee5\u770b\u5230\u5728task_struct\u4e2d\u7684struct files_struct* files\u7ed3\u6784！<\/p>\n

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

                      \u53ef\u4ee5\u770b\u5230，struct files_struct\u5305\u542b\u7740\u4e00\u4e2a\u6570\u7ec4fd_array\u3002\u6570\u7ec4\u5143\u7d20\u662fstruct file*\u7c7b\u578b，\u8fd9\u4e2a\u7ed3\u6784\u4f53\u7c7b\u578b，\u5c31\u5bf9\u5e94\u7740\u6bcf\u4e00\u4e2a\u5177\u4f53\u7684\u6587\u4ef6，\u91cc\u9762\u5305\u542b\u7740\u6587\u4ef6\u5404\u79cd\u8be6\u7ec6\u5c5e\u6027！<\/p>\n

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

                      \u7ed3\u8bba：\u672c\u8d28\u4e0a，\u6587\u4ef6\u63cf\u8ff0\u7b26 fd \u5c31\u662f\u8fd9\u4e2a\u6570\u7ec4 fd_array \u7684\u4e0b\u6807，\u6bcf\u4e2a\u6587\u4ef6\u7684 fd \u5c31\u662f\u5b83\u5728\u8fd9\u4e2a\u6570\u7ec4\u4e2d\u7684\u4e0b\u6807！<\/p>\n

                      2. \u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u5206\u914d\u89c4\u5219<\/h3>\n

                      \u6211\u4eec\u6765\u770b\u51e0\u6bb5\u4ee3\u7801\u548c\u73b0\u8c61：<\/p>\n

                      #<\/span>include<\/span><stdio.h><\/span><\/span>
                      \n#<\/span>include<\/span><sys\/types.h><\/span><\/span>
                      \n#<\/span>include<\/span><sys\/stat.h><\/span><\/span>
                      \n#<\/span>include<\/span><fcntl.h><\/span><\/span>
                      \n#<\/span>include<\/span><unistd.h><\/span><\/span><\/p>\n

                      int<\/span> main<\/span>(<\/span>)<\/span>
                      \n{<\/span>
                      \n int<\/span> fd =<\/span> open<\/span>(<\/span>"myfile.txt"<\/span>,<\/span> O_WRONLY |<\/span> O_CREAT)<\/span>;<\/span>
                      \n if<\/span>(<\/span>fd <<\/span> 0<\/span>)<\/span>
                      \n {<\/span>
                      \n perror<\/span>(<\/span>"\u6253\u5f00\u6587\u4ef6\u5931\u8d25"<\/span>)<\/span>;<\/span>
                      \n return<\/span> 1<\/span>;<\/span>
                      \n }<\/span><\/p>\n

                      printf<\/span>(<\/span>"fd: %d\\\\n"<\/span>,<\/span> fd)<\/span>;<\/span>
                      \n close<\/span>(<\/span>fd)<\/span>;<\/span><\/p>\n

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

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

                        \n
                      • \u73b0\u8c611：\u76f4\u63a5\u6253\u5f00\u4e00\u4e2a\u65b0\u7684\u6587\u4ef6，fd\u662f3\u3002<\/li>\n<\/ul>\n

                        #<\/span>include<\/span><stdio.h><\/span><\/span>
                        \n#<\/span>include<\/span><sys\/types.h><\/span><\/span>
                        \n#<\/span>include<\/span><sys\/stat.h><\/span><\/span>
                        \n#<\/span>include<\/span><fcntl.h><\/span><\/span>
                        \n#<\/span>include<\/span><unistd.h><\/span><\/span><\/p>\n

                        int<\/span> main<\/span>(<\/span>)<\/span>
                        \n{<\/span>
                        \n close<\/span>(<\/span>0<\/span>)<\/span>;<\/span><\/p>\n

                        int<\/span> fd =<\/span> open<\/span>(<\/span>"myfile.txt"<\/span>,<\/span> O_WRONLY |<\/span> O_CREAT)<\/span>;<\/span>
                        \n if<\/span>(<\/span>fd <<\/span> 0<\/span>)<\/span>
                        \n {<\/span>
                        \n perror<\/span>(<\/span>"\u6253\u5f00\u6587\u4ef6\u5931\u8d25"<\/span>)<\/span>;<\/span>
                        \n return<\/span> 1<\/span>;<\/span>
                        \n }<\/span><\/p>\n

                        printf<\/span>(<\/span>"fd: %d\\\\n"<\/span>,<\/span> fd)<\/span>;<\/span>
                        \n close<\/span>(<\/span>fd)<\/span>;<\/span><\/p>\n

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

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

                          \n
                        • \u73b0\u8c612：\u5148\u5173\u95ed\u6807\u51c6\u8f93\u51650，\u518d\u6253\u5f00\u4e00\u4e2a\u65b0\u6587\u4ef6，\u5b83\u7684fd\u662f0\u3002<\/li>\n<\/ul>\n

                          #<\/span>include<\/span><stdio.h><\/span><\/span>
                          \n#<\/span>include<\/span><sys\/types.h><\/span><\/span>
                          \n#<\/span>include<\/span><sys\/stat.h><\/span><\/span>
                          \n#<\/span>include<\/span><fcntl.h><\/span><\/span>
                          \n#<\/span>include<\/span><unistd.h><\/span><\/span><\/p>\n

                          int<\/span> main<\/span>(<\/span>)<\/span>
                          \n{<\/span>
                          \n close<\/span>(<\/span>0<\/span>)<\/span>;<\/span><\/p>\n

                          int<\/span> fd =<\/span> open<\/span>(<\/span>"myfile.txt"<\/span>,<\/span> O_WRONLY |<\/span> O_CREAT)<\/span>;<\/span>
                          \n if<\/span>(<\/span>fd <<\/span> 0<\/span>)<\/span>
                          \n {<\/span>
                          \n perror<\/span>(<\/span>"\u6253\u5f00\u6587\u4ef6\u5931\u8d25"<\/span>)<\/span>;<\/span>
                          \n return<\/span> 1<\/span>;<\/span>
                          \n }<\/span><\/p>\n

                          printf<\/span>(<\/span>"fd: %d\\\\n"<\/span>,<\/span> fd)<\/span>;<\/span>
                          \n close<\/span>(<\/span>fd)<\/span>;<\/span><\/p>\n

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

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

                            \n
                          • \u73b0\u8c613：\u5148\u5173\u95ed\u6807\u51c6\u9519\u8bef2，\u518d\u6253\u5f00\u4e00\u4e2a\u65b0\u6587\u4ef6，\u5b83\u7684fd\u662f2\u3002<\/li>\n<\/ul>\n

                            \u8fd9\u4e09\u4e2a\u73b0\u8c61\u53ef\u4ee5\u5f97\u51fa\u7ed3\u8bba\u4e86：\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u5206\u914d\u89c4\u5219\u662f，\u5728files_struct\u7684fd_array\u6570\u7ec4\u4e2d，\u627e\u5230\u4e00\u4e2a\u5f53\u524d\u6ca1\u6709\u88ab\u4f7f\u7528\u7684\u6700\u5c0f\u7684\u4e0b\u6807，\u4f5c\u4e3a\u65b0\u6253\u5f00\u6587\u4ef6\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26！\u5f53\u6587\u4ef6\u88ab\u5173\u95ed\u65f6，\u5b83\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u5c31\u201c\u7a7a\u201d\u51fa\u6765\u4e86\u3002<\/p>\n

                            3. \u91cd\u5b9a\u5411<\/h3>\n

                            \u5728\u4e0a\u9762\u7684\u73b0\u8c61\u4e2d，\u5982\u679c\u5148\u5173\u95ed\u6807\u51c6\u8f93\u51fa1\u5462？<\/p>\n

                            #<\/span>include<\/span><stdio.h><\/span><\/span>
                            \n#<\/span>include<\/span><sys\/types.h><\/span><\/span>
                            \n#<\/span>include<\/span><sys\/stat.h><\/span><\/span>
                            \n#<\/span>include<\/span><fcntl.h><\/span><\/span>
                            \n#<\/span>include<\/span><unistd.h><\/span><\/span><\/p>\n

                            int<\/span> main<\/span>(<\/span>)<\/span>
                            \n{<\/span>
                            \n close<\/span>(<\/span>1<\/span>)<\/span>;<\/span><\/p>\n

                            int<\/span> fd =<\/span> open<\/span>(<\/span>"myfile.txt"<\/span>,<\/span> O_WRONLY |<\/span> O_CREAT,<\/span> 0644<\/span>)<\/span>;<\/span>
                            \n if<\/span>(<\/span>fd <<\/span> 0<\/span>)<\/span>
                            \n {<\/span>
                            \n perror<\/span>(<\/span>"\u6253\u5f00\u6587\u4ef6\u5931\u8d25"<\/span>)<\/span>;<\/span>
                            \n return<\/span> 1<\/span>;<\/span>
                            \n }<\/span><\/p>\n

                            printf<\/span>(<\/span>"fd: %d\\\\n"<\/span>,<\/span> fd)<\/span>;<\/span><\/p>\n

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

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

                            \u6211\u4eec\u53d1\u73b0，printf\u51fd\u6570\u5e76\u6ca1\u6709\u6253\u5370\u5230\u663e\u793a\u5668\u4e0a，\u800c\u662f\u5199\u5165\u5230\u4e86 myfile.txt \u6587\u4ef6\u4e2d\u3002<\/p>\n

                            \u539f\u56e0： \u6587\u4ef6\u63cf\u8ff0\u7b261\u88ab\u5173\u95ed\u4e86，\u800c1\u6b63\u662f\u6807\u51c6\u8f93\u51fastdout\u7684\u9ed8\u8ba4\u6587\u4ef6\u63cf\u8ff0\u7b26\u3002 \u518d\u65b0\u6253\u5f00\u4e00\u4e2a\u6587\u4ef6myfile.txt，\u6839\u636e\u521a\u624d\u8bf4\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u5206\u914d\u89c4\u5219，\u5b83\u7684 fd \u5c31\u6210\u4e861\u3002 printf \u5e93\u51fd\u6570，\u5185\u90e8\u672c\u6765\u5c01\u88c5\u4e86write(1, …);\u8fd9\u6837\u7684\u7cfb\u7edf\u8c03\u7528，\u6240\u4ee5\u6b63\u5e38\u60c5\u51b5\u4e0b\u5c31\u662f\u5411\u6807\u51c6\u8f93\u51fa1\u663e\u793a\u5668\u5199\u5165，\u53ef\u662f\u73b0\u57281\u53d8\u6210myfile.txt，\u4f46printf\u4e0d\u77e5\u9053，\u5b83\u53ea\u8ba4\u6587\u4ef6\u63cf\u8ff0\u7b261，\u4e8e\u662f\u6267\u884c\u540e\u5185\u5bb9\u88ab\u5199\u8fdb\u4e86myfile.txt！<\/p>\n

                            \u8fd9\u79cd\u73b0\u8c61\u53eb\u505a\u8f93\u51fa\u91cd\u5b9a\u5411！\u547d\u4ee4\u884c\u4e2d< > >>\u4e5f\u662f\u91cd\u5b9a\u5411！<\/p>\n

                            \u5728 Linux \u7cfb\u7edf\u4e2d，\u91cd\u5b9a\u5411\u7684\u672c\u8d28\u662f\u4fee\u6539\u6587\u4ef6\u63cf\u8ff0\u7b26 fd \u4e0e\u6587\u4ef6\u7684\u5173\u7cfb，\u7528\u4e00\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u5185\u5bb9\u6307\u5411\u53e6\u4e00\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u5185\u5bb9 \u3002\u4f8b\u5982，\u6587\u4ef6\u63cf\u8ff0\u7b26 x \u539f\u672c\u6307\u5411\u6587\u4ef6A\u7684 struct file，\u6587\u4ef6\u63cf\u8ff0\u7b26 y \u539f\u672c\u6307\u5411\u6587\u4ef6B\u7684 struct file\u3002\u82e5\u901a\u8fc7\u67d0\u4e9b\u7cfb\u7edf\u8c03\u7528\u8ba9 x \u4e5f\u6307\u5411\u6587\u4ef6B\u7684 struct file，\u5219\u540e\u7eed\u6240\u6709\u901a\u8fc7 x \u7684\u6587\u4ef6\u64cd\u4f5c，\u90fd\u4f1a\u4f5c\u7528\u4e8e\u6587\u4ef6B\u800c\u975e\u6587\u4ef6A\u3002<\/p>\n

                            \u5b9e\u73b0\u8fd9\u4e2a\u8fc7\u7a0b\u7684\u7cfb\u7edf\u8c03\u7528\u662fdup2：<\/p>\n

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

                            \u8c03\u7528\u540e，\u7b2c\u4e8c\u4e2a\u53c2\u6570 fd \u7684\u6307\u9488\u4f1a\u6307\u5411\u7b2c\u4e00\u4e2a\u53c2\u6570\u7684 fd \u6307\u5411\u7684\u6587\u4ef6，\u4e5f\u5c31\u662f\u7b2c\u4e00\u4e2a fd \u8986\u76d6\u4e86\u7b2c\u4e8c\u4e2a fd\u3002<\/p>\n

                            #<\/span>include<\/span><stdio.h><\/span><\/span>
                            \n#<\/span>include<\/span><sys\/types.h><\/span><\/span>
                            \n#<\/span>include<\/span><sys\/stat.h><\/span><\/span>
                            \n#<\/span>include<\/span><fcntl.h><\/span><\/span>
                            \n#<\/span>include<\/span><unistd.h><\/span><\/span>
                            \n#<\/span>include<\/span><string.h><\/span><\/span>
                            \nint<\/span> main<\/span>(<\/span>)<\/span>
                            \n{<\/span>
                            \n int<\/span> fd =<\/span> open<\/span>(<\/span>"log.txt"<\/span>,<\/span> O_CREAT |<\/span> O_WRONLY,<\/span> 0644<\/span>)<\/span>;<\/span><\/p>\n

                            dup2<\/span>(<\/span>fd,<\/span> 1<\/span>)<\/span>;<\/span> \/\/ fd\u8986\u76d6\u4e861, 1\u4e5f\u6307\u5411fd\u6307\u5411\u7684\u6587\u4ef6<\/span><\/p>\n

                            const<\/span> char<\/span>*<\/span> s =<\/span> "hello!\\\\n"<\/span>;<\/span>
                            \n write<\/span>(<\/span>1<\/span>,<\/span> s,<\/span> strlen<\/span>(<\/span>s)<\/span>)<\/span>;<\/span> \/\/ \u672c\u6765\u60f3\u5199\u51651，\u4f46\u5b9e\u9645\u4e0a\u5199\u5165\u4e86fd<\/span><\/p>\n

                            close<\/span>(<\/span>fd)<\/span>;<\/span><\/p>\n

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

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

                            \u56db\u3001\u7f13\u51b2\u533a\u4e0e\u5237\u65b0\u64cd\u4f5c<\/h2>\n

                            1. \u4e3a\u4ec0\u4e48\u8981\u6709\u7f13\u51b2\u533a<\/h3>\n

                            \u7f13\u51b2\u533a\u662f\u5185\u5b58\u7a7a\u95f4\u4e2d\u7684\u4e00\u90e8\u5206，\u8fd9\u4e9b\u5b58\u50a8\u7a7a\u95f4\u7528\u6765\u7f13\u51b2\u8f93\u5165\u6216\u8f93\u51fa\u7684\u6570\u636e，\u8fd9\u90e8\u5206\u9884\u7559\u7684\u7a7a\u95f4\u53eb\u505a\u7f13\u51b2\u533a\u3002<\/p>\n

                            \u8bfb\u5199\u6587\u4ef6\u65f6，\u5982\u679c\u4e0d\u4f1a\u5f00\u8f9f\u6587\u4ef6\u64cd\u4f5c\u7684\u7f13\u51b2\u533a，\u76f4\u63a5\u901a\u8fc7\u7cfb\u7edf\u8c03\u7528\u5bf9\u78c1\u76d8\u8fdb\u884cIO\u64cd\u4f5c，\u90a3\u4e48\u6bcf\u4e00\u6b21\u6267\u884c\u7cfb\u7edf\u8c03\u7528\u90fd\u6d89\u53ca\u5230CPU\u72b6\u6001\u7684\u5207\u6362，\u8fd9\u5c06\u4ed8\u51fa\u4e00\u5b9a\u7684\u6548\u7387\u6210\u672c，\u6240\u4ee5\u9891\u7e41\u7684\u78c1\u76d8\u8bbf\u95ee\u4f1a\u5bf9\u7a0b\u5e8f\u7684\u6267\u884c\u6548\u7387\u9020\u6210\u5f88\u5927\u5f71\u54cd！ \u6211\u4eec\u53ef\u4ee5\u91c7\u7528\u7f13\u51b2\u673a\u5236，\u6bd4\u5982\u4ece\u78c1\u76d8\u4e2d\u8bfb\u6587\u4ef6\u65f6，\u53ef\u4ee5\u4e00\u6b21\u6027\u4ece\u6587\u4ef6\u4e2d\u8bfb\u53d6\u5927\u91cf\u7684\u6570\u636e\u5230\u7f13\u51b2\u533a\u4e2d，\u7136\u540e\u8fd9\u90e8\u5206\u7684\u8bbf\u95ee\u5c31\u4e0d\u7528\u518d\u8c03\u7528\u7cfb\u7edf\u8c03\u7528\u4e86，\u4ee5\u51cf\u5c11\u78c1\u76d8\u7684\u8bfb\u5199\u6b21\u6570，\u518d\u52a0\u4e0a\u8ba1\u7b97\u673a\u5bf9\u7f13\u51b2\u533a\u7684\u64cd\u4f5c\u5927\u5927\u5feb\u4e8e\u5bf9\u78c1\u76d8\u7684\u64cd\u4f5c\u901f\u5ea6，\u6240\u4ee5\u7f13\u51b2\u533a\u53ef\u4ee5\u63d0\u9ad8\u8ba1\u7b97\u673a\u7684\u8fd0\u884c\u901f\u5ea6\u3002<\/p>\n

                            2. \u8bed\u8a00\u7ea7\u7f13\u51b2\u533a\u4e0e\u5185\u6838\u7ea7\u7f13\u51b2\u533a<\/h3>\n

                            \u7f13\u51b2\u533a\u5176\u5b9e\u5206\u4e3a：\u8bed\u8a00\u7ea7\u7f13\u51b2\u533a\u3001\u5185\u6838\u7ea7\u7f13\u51b2\u533a\u3002<\/p>\n

                            \u8bed\u8a00\u7ea7\u7f13\u51b2\u533a\u662f\u7531\u8bed\u8a00\u7ef4\u62a4\u7684，\u5c5e\u4e8e\u7528\u6237\u5c42\u3002 \u5185\u6838\u7ea7\u7f13\u51b2\u533a\u662f\u7cfb\u7edf\u7ef4\u62a4\u7684，\u7528\u6237\u4e0d\u5fc5\u5173\u5fc3\u3002<\/p>\n

                            \u4e3e\u4f8b，\u4f60\u6267\u884cfprintf(fp, "hello");：<\/p>\n

                              \n
                            • \u6570\u636e\u5148\u88ab\u5199\u5165C\u5e93\u7ef4\u62a4\u7684\u8bed\u8a00\u7ea7\u7f13\u51b2\u533a（\u7528\u6237\u6001），\u6b64\u65f6\u65e2\u6ca1\u6709\u89e6\u53d1\u7cfb\u7edf\u8c03\u7528，\u4e5f\u6ca1\u6709\u5199\u5185\u6838；<\/li>\n
                            • \u5237\u65b0\u65f6，C\u5e93\u8c03\u7528 write() \u7cfb\u7edf\u8c03\u7528，\u628a\u6570\u636e\u4ece\u8bed\u8a00\u7ea7\u7f13\u51b2\u533a\u62f7\u8d1d\u5230\u5185\u6838\u7ea7\u7f13\u51b2\u533a（\u5185\u6838\u6001），\u6b64\u65f6\u4ecd\u672a\u5199\u786c\u76d8；<\/li>\n
                            • \u5185\u6838\u4f1a\u5f02\u6b65\u5730\u628a\u5185\u6838\u7ea7\u7f13\u51b2\u533a\u7684\u6570\u636e\u5199\u5230\u78c1\u76d8；<\/li>\n
                            • \u5982\u679c\u4f60\u60f3\u5f3a\u5236\u5199\u5230\u78c1\u76d8，\u9700\u8981\u8c03\u7528 fsync(fd) \u7cfb\u7edf\u8c03\u7528，\u628a\u5185\u6838\u7ea7\u7f13\u51b2\u533a\u7684\u6570\u636e\u5f3a\u5236\u5237\u5230\u7269\u7406\u78c1\u76d8\u4e2d\u3002<\/li>\n<\/ul>\n

                              \u5237\u65b0（Flush）\u5c31\u662f\u628a\u7f13\u51b2\u533a\u91cc\u6682\u5b58\u7684\u6570\u636e，\u5f3a\u5236\u5199\u5165\u5230\u76ee\u6807\u6587\u4ef6\u4e2d，\u5e76\u6e05\u7a7a\u7f13\u51b2\u533a\u3002 \u672c\u8d28\u4e0a，\u8bed\u8a00\u7ea7\u7f13\u51b2\u533a\u5237\u65b0\u5c31\u662f\u8bed\u8a00\u7ea7\u7f13\u51b2\u533a\u7528write()\u7cfb\u7edf\u8c03\u7528\u5c06\u6570\u636e\u62f7\u8d1d\u5230\u5185\u6838\u6587\u4ef6\u7f13\u51b2\u533a\u3002<\/p>\n

                              \u7406\u8bba\u4e0a，\u6570\u636e\u4eceC\u8bed\u8a00\u7f13\u51b2\u533a\u5237\u65b0\u5230\u5185\u6838\u6587\u4ef6\u7f13\u51b2\u533a\u540e，\u540e\u9762\u5168\u7531OS\u63a7\u5236\u4e86，\u7528\u6237\u5df2\u7ecf\u53ef\u4ee5\u8ba4\u4e3a\u6570\u636e\u5199\u5165\u4e86\u78c1\u76d8\u4e2d，\u4f46\u5b9e\u9645\u4e0a\u8fd8\u8981\u7b49\u5230\u5185\u6838\u7f13\u51b2\u533a\u7684\u5237\u65b0\u624d\u662f\u771f\u6b63\u7684\u5b8c\u6210\u3002<\/p>\n

                              \u4f60\u4e5f\u53ef\u4ee5\u4f7f\u7528\u7cfb\u7edf\u8c03\u7528fsync\u6765\u5f3a\u5236\u8ba9\u5185\u6838\u7f13\u51b2\u533a\u5237\u65b0\u5230\u78c1\u76d8\u6587\u4ef6\u4e2d： \"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"<\/p>\n

                              C\u8bed\u8a00\u7f13\u51b2\u533a\u662f\u7531FILE\u7ed3\u6784\u4f53\u7ef4\u62a4\u7684！\u8fd9\u4e2a\u7ed3\u6784\u4f53\u5c01\u88c5\u4e86\u6587\u4ef6\u63cf\u8ff0\u7b26\u3001\u7f13\u51b2\u533a\u7b49\u4fe1\u606f.\u5728\/usr\/include\/stdio.h\u4e2d\u53ef\u4ee5\u770b\u5230：<\/p>\n

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

                              \/usr\/include\/libio.h\u4e2d：<\/p>\n

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

                              3. \u5237\u65b0\u65b9\u5f0f<\/h3>\n

                              \u8bed\u8a00\u7ea7\u7f13\u51b2\u533a\u6709\u51e0\u79cd\u5237\u65b0\u65b9\u5f0f：<\/p>\n

                                \n
                              • \u8fdb\u7a0b\u7ed3\u675f\u65f6，\u4f1a\u81ea\u52a8\u5237\u65b0，\u9664\u975e\u662f\u7cfb\u7edf\u8c03\u7528_exit()\u7ed3\u675f\u7684\u8fdb\u7a0b\u3002<\/li>\n
                              • \u5f53\u76ee\u6807\u6587\u4ef6\u662f\u663e\u793a\u5668\u65f6，\u7f13\u51b2\u7c7b\u578b\u662f\u201c\u884c\u7f13\u51b2\u201d，\u9047\u5230 \\\\n \u6362\u884c\u7b26\u65f6\u81ea\u52a8\u5237\u65b0\u3002<\/li>\n
                              • \u5f53\u76ee\u6807\u6587\u4ef6\u662f\u666e\u901a\u6587\u4ef6\u65f6，\u7f13\u51b2\u7c7b\u578b\u662f\u201c\u5168\u7f13\u51b2\u201d，\u7f13\u51b2\u533a\u5199\u6ee1\u4e86\u624d\u4f1a\u5237\u65b0\u3002<\/li>\n
                              • \u901a\u8fc7fflush(FILE*)\u51fd\u6570\u5f3a\u5236\u5237\u65b0\u6307\u5b9a\u7684\u8bed\u8a00\u7ea7\u6587\u4ef6\u7f13\u51b2\u533a\u3002<\/li>\n<\/ul>\n

                                \u4e3e\u4e2a\u4f8b\u5b50：<\/p>\n

                                #<\/span>include<\/span><stdio.h><\/span><\/span>
                                \n#<\/span>include<\/span><sys\/types.h><\/span><\/span>
                                \n#<\/span>include<\/span><sys\/stat.h><\/span><\/span>
                                \n#<\/span>include<\/span><fcntl.h><\/span><\/span>
                                \n#<\/span>include<\/span><unistd.h><\/span><\/span><\/p>\n

                                int<\/span> main<\/span>(<\/span>)<\/span>
                                \n{<\/span>
                                \n close<\/span>(<\/span>1<\/span>)<\/span>;<\/span>
                                \n int<\/span> fd =<\/span> open<\/span>(<\/span>"log.txt"<\/span>,<\/span> O_CREAT |<\/span> O_WRONLY,<\/span> 0644<\/span>)<\/span>;<\/span>
                                \n printf<\/span>(<\/span>"hello!\\\\n"<\/span>)<\/span>;<\/span><\/p>\n

                                close<\/span>(<\/span>fd)<\/span>;<\/span><\/p>\n

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

                                \u5148\u5173\u95ed\u4e861，\u7136\u540e\u6253\u5f00log.txt\u6587\u4ef6，\u6267\u884cprintf\u51fd\u6570，\u7136\u540eclose(fd)\u3002\u6309\u7167\u521a\u624d\u7684\u903b\u8f91，hello!\u8bed\u53e5\u5e94\u8be5\u4f1a\u5199\u5165log.txt\u6587\u4ef6\u4e2d，\u53ef\u662f\u6267\u884c\u7a0b\u5e8f\u540e\u5374\u53d1\u73b0log.txt\u6ca1\u6709\u5185\u5bb9！<\/p>\n

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

                                \u539f\u672c，\u76ee\u6807\u6587\u4ef6\u662fstdout\u663e\u793a\u5668\u65f6，\u8bed\u8a00\u7ea7\u7f13\u51b2\u533a\u4f1a\u6267\u884c\u884c\u7f13\u51b2，\u6267\u884cprintf\u65f6\u9047\u5230 \\\\n \u5c31\u4f1a\u7acb\u523b\u5237\u65b0\u4e00\u6b21\u3002 \u53ef\u662f，\u73b0\u5728\u91cd\u5b9a\u5411\u5230\u4e86log.txt\u6587\u4ef6，\u8fd9\u662f\u4e00\u4e2a\u666e\u901a\u6587\u4ef6，\u6267\u884c\u7684\u662f\u5168\u7f13\u51b2！\u53ea\u6709\u5f53\u7f13\u51b2\u533a\u6ee1\u6216\u8fdb\u7a0b\u7ed3\u675f\u624d\u4f1a\u5237\u65b0\u3002\u4f46\u662f\u663e\u7136\u6b64\u65f6\u7f13\u51b2\u533a\u6ca1\u6ee1，\u6ca1\u6709\u5237\u65b0\u3002\u8fdb\u7a0b\u7ed3\u675f\u524d，\u4ee3\u7801close(fd)\u4f7flog.txt\u6587\u4ef6\u5173\u95ed\u4e86！\u201chello!\\\\n\u201d\u53ea\u5b58\u5728\u4e8eC\u8bed\u8a00\u7684\u7f13\u51b2\u533a\u4e2d，\u65e2\u6ca1\u6709\u88ab\u5237\u65b0\u5230\u5185\u6838\u7ea7\u7f13\u51b2\u533a，\u4e5f\u6ca1\u6709\u5199\u5165log.txt，\u6700\u7ec8\u968f\u7740\u7a0b\u5e8f\u9000\u51fa，\u7f13\u51b2\u533a\u88ab\u91ca\u653e，\u6570\u636e\u4e22\u5931\u3002<\/p>\n

                                \u53e6\u4e00\u4e2a\u4f8b\u5b50：<\/p>\n

                                #<\/span>include<\/span><stdio.h><\/span><\/span>
                                \n#<\/span>include<\/span><sys\/types.h><\/span><\/span>
                                \n#<\/span>include<\/span><sys\/stat.h><\/span><\/span>
                                \n#<\/span>include<\/span><fcntl.h><\/span><\/span>
                                \n#<\/span>include<\/span><unistd.h><\/span><\/span>
                                \n#<\/span>include<\/span><string.h><\/span><\/span>
                                \nint<\/span> main<\/span>(<\/span>)<\/span>
                                \n{<\/span>
                                \n close<\/span>(<\/span>1<\/span>)<\/span>;<\/span>
                                \n int<\/span> fd =<\/span> open<\/span>(<\/span>"log.txt"<\/span>,<\/span> O_CREAT |<\/span> O_WRONLY,<\/span> 0644<\/span>)<\/span>;<\/span><\/p>\n

                                printf<\/span>(<\/span>"hello, printf!\\\\n"<\/span>)<\/span>;<\/span>
                                \n const<\/span> char<\/span>*<\/span> s =<\/span> "hello, write!\\\\n"<\/span>;<\/span>
                                \nwrite<\/span>(<\/span>fd,<\/span> s,<\/span> strlen<\/span>(<\/span>s)<\/span>)<\/span>;<\/span><\/p>\n

                                fork<\/span>(<\/span>)<\/span>;<\/span>
                                \n return<\/span> 0<\/span>;<\/span>
                                \n}<\/span><\/p>\n

                                \u5411log.txt\u4e2d\u5206\u522b\u7528\u5e93\u51fd\u6570printf\u548c\u7cfb\u7edf\u8c03\u7528write\u5199\u5165，\u7136\u540e\u521b\u5efa\u4e00\u4e2a\u5b50\u8fdb\u7a0b，\u7ed3\u679c\u662f：<\/p>\n

                                \"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \u539f\u56e0：<\/p>\n

                                  \n
                                • write\u662f\u7cfb\u7edf\u8c03\u7528，\u76f4\u63a5\u64cd\u4f5c\u5185\u6838\u7ea7\u7f13\u51b2\u533a，\u8c03\u7528write\u65f6，\u6570\u636e\u76f4\u63a5\u4f20\u9012\u5230\u5185\u6838\u6001\u7f13\u51b2\u533a（\u540e\u7eed\u7531\u5185\u6838\u5237\u65b0\u5230log.txt），\u5b50\u8fdb\u7a0b\u4e0d\u4f1a\u5f71\u54cd\u3002<\/li>\n
                                • printf\u662fC\u5e93\u51fd\u6570，\u6570\u636e\u5b58\u5728C\u8bed\u8a00\u7f13\u51b2\u533a\u4e2d，\u76ee\u6807\u6587\u4ef6\u662f\u666e\u901a\u6587\u4ef6，\u7f13\u51b2\u533a\u6ca1\u6ee1，\u53ea\u6709\u8fdb\u7a0b\u7ed3\u675f\u540e\u624d\u5237\u65b0\u3002\u800cfork()\u4f1a\u5b8c\u6574\u62f7\u8d1d\u7236\u8fdb\u7a0b\u7684\u5185\u5b58\u7a7a\u95f4，\u5305\u62ecC\u5e93\u7684\u7f13\u51b2\u533a，\u5bfc\u81f4\u7236\u5b50\u8fdb\u7a0b\u7684C\u8bed\u8a00\u7f13\u51b2\u533a\u91cc\u5404\u6709\u4e00\u4efd \u201chello, printf!\\\\n\u201d\u3002\u7236\u5b50\u8fdb\u7a0b\u9000\u51fa\u65f6，\u90fd\u4f1a\u5237\u65b0\u81ea\u5df1\u7684\u7f13\u51b2\u533a，\u4e5f\u5c31\u8f93\u51fa\u4e86\u4e24\u6b21！<\/li>\n<\/ul>\n

                                  \u672c\u7bc7\u5b8c，\u611f\u8c22\u9605\u8bfb！<\/p>\n","protected":false},"excerpt":{"rendered":"

                                  \u5404\u4f4d\u8bfb\u8005\u5927\u4f6c\u597d，\u6211\u662f\u843d\u7fbd！\u4e00\u4e2a\u575a\u6301\u4e0d\u65ad\u5b66\u4e60\u8fdb\u6b65\u7684\u5b66\u751f\u3002 \u5982\u679c\u60a8\u89c9\u5f97\u6211\u7684\u6587\u7ae0\u8fd8\u4e0d\u9519，\u6b22\u8fce\u591a\u591a\u4e09\u8fde\u5206\u4eab\u4ea4\u6d41，\u4e00\u8d77\u5b66\u4e60\u8fdb\u6b65！ \u6b22\u8fce\u5173\u6ce8\u6211\u7684blog\u4e3b\u9875: \u843d\u7fbd\u7684\u843d\u7fbd \u6587\u7ae0\u76ee\u5f55\u4e00\u3001C\u8bed\u8a00\u4e2d\u7684\u6587\u4ef6IO\u64cd\u4f5c\u4e8c\u3001Linux\u4e2d\u7684\u6587\u4ef6IO\u7cfb\u7edf\u8c03\u75281. open\u3001write\u3001close\u4e09\u3001\u6587\u4ef6\u63cf\u8ff0\u7b26fd1. \u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u672c\u8d282. \u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u5206\u914d\u89c4\u52193. \u91cd\u5b9a\u5411\u56db\u3001\u7f13\u51b2\u533a\u4e0e\u5237\u65b0\u64cd\u4f5c1. \u4e3a\u4ec0\u4e48\u8981\u6709\u7f13\u51b2\u533a2. \u8bed\u8a00\u7ea7\u7f13\u51b2\u533a\u4e0e<\/p>\n","protected":false},"author":2,"featured_media":72198,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[55,58,50,190,1813,43,207],"topic":[],"class_list":["post-72218","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-server","tag-c","tag-linux","tag-50","tag-190","tag-1813","tag-43","tag-207"],"yoast_head":"\n\u3010Linux\u7cfb\u7edf\u3011\u6587\u4ef6IO\uff1a\u7406\u89e3\u6587\u4ef6\u63cf\u8ff0\u7b26\u3001\u91cd\u5b9a\u5411\u3001\u7f13\u51b2\u533a - 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