{"id":41532,"date":"2025-06-03T15:46:00","date_gmt":"2025-06-03T07:46:00","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/41532.html"},"modified":"2025-06-03T15:46:00","modified_gmt":"2025-06-03T07:46:00","slug":"%e3%80%90linux%e3%80%91%e5%9f%ba%e7%a1%80%e6%96%87%e4%bb%b6io","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/41532.html","title":{"rendered":"\u3010Linux\u3011\u57fa\u7840\u6587\u4ef6IO"},"content":{"rendered":"<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/06\/20250603074556-683ea834a37c5.png\" alt=\"\" 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class=\"token string\">&lt;sys\/types.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;sys\/stat.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;fcntl.h&gt;<\/span><\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">open<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">const<\/span> <span class=\"token keyword\">char<\/span> <span class=\"token operator\">*<\/span>pathname<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> flags<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> <span class=\"token function\">open<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">const<\/span> <span class=\"token keyword\">char<\/span> <span class=\"token operator\">*<\/span>pathname<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> flags<span class=\"token punctuation\">,<\/span> mode_t mode<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u53c2\u6570pathname&#xff1a;\u8981\u6253\u5f00\u7684\u6587\u4ef6\u8def\u5f84&#xff08;\u7528\u5b57\u7b26\u4e32\u8868\u793a&#xff09;<\/p>\n<p>\u53c2\u6570flags&#xff1a;\u8868\u793a\u6253\u5f00\u6587\u4ef6\u7684\u65b9\u5f0f\u3002\u53ef\u4f20\u5165\u7684\u53c2\u6570\u6709\u5982\u4e0b\u51e0\u79cd\u5b8f&#xff1a;<\/p>\n<ul>\n<li>O_RDONLY&#xff1a;\u53ea\u8bfb\u6a21\u5f0f\u6253\u5f00\u6587\u4ef6\u3002<\/li>\n<li>O_WRONLY&#xff1a;\u53ea\u5199\u6a21\u5f0f\u6253\u5f00\u6587\u4ef6\u3002<\/li>\n<li>O_RDWR&#xff1a;\u8bfb\u5199\u6a21\u5f0f\u6253\u5f00\u6587\u4ef6\u3002<\/li>\n<li>O_CREAT&#xff1a;\u5982\u679c\u6587\u4ef6\u4e0d\u5b58\u5728&#xff0c;\u5219\u521b\u5efa\u6587\u4ef6&#xff08;\u6b64\u65f6\u9700\u8981\u4f20\u7b2c\u4e09\u4e2a\u53c2\u6570&#xff09;\u3002<\/li>\n<li>O_TRUNC&#xff1a;\u5982\u679c\u6587\u4ef6\u5df2\u5b58\u5728&#xff0c;\u6e05\u7a7a\u5176\u5185\u5bb9\u3002<\/li>\n<li>O_APPEND&#xff1a;\u5199\u5165\u65f6\u8ffd\u52a0\u5230\u6587\u4ef6\u672b\u5c3e\u3002<\/li>\n<\/ul>\n<p>\u4e0d\u96be\u53d1\u73b0&#xff0c;\u4e0a\u8ff0\u7684\u67d0\u4e9b\u8bbe\u5b9a\u662f\u53ef\u4ee5\u540c\u65f6\u5b58\u5728&#xff08;\u4f8b\u5982\u53ea\u5199\u6253\u5f00\u65f6&#xff0c;\u5982\u679c\u6587\u4ef6\u4e0d\u5b58\u5728\u53ef\u4ee5\u8bbe\u5b9a\u521b\u5efa\u6587\u4ef6&#xff0c;\u5982\u679c\u5df2\u7ecf\u5b58\u5728\u5219\u6e05\u7a7a&#xff09;&#xff0c;\u56e0\u6b64\u8fd9\u4e9b\u53c2\u6570\u53ef\u4ee5\u81ea\u884c\u9009\u62e9\u540c\u65f6\u4f20\u5165&#xff08;\u4f8b\u5982O_WRONLY | O_CREAT | O_TRUNC&#xff09;\u3002\u4e3a\u4ec0\u4e48\u53ef\u4ee5\u7528\u6309\u4f4d\u6216\u7684\u65b9\u5f0f\u4f20\u5165\u591a\u4e2a\u53c2\u6570\u5462&#xff1f;\u5176\u5b9e\u662f\u7531\u4f4d\u63a9\u7801\u5b9e\u73b0\u7684&#xff1a;<\/p>\n<p>\u5047\u5982\u5b8fO_WRONLY\u88ab\u66ff\u6362\u4e3a0000 0001(\u4e8c\u8fdb\u5236)&#xff0c;\u800c\u5b8fO_CREAT\u88ab\u66ff\u6362\u4e3a0000 0010(\u4e8c\u8fdb\u5236)&#xff0c;\u5b8fO_TRUNC\u88ab\u66ff\u6362\u4e3a0000 0100(\u4e8c\u8fdb\u5236)&#xff0c;\u4e09\u8005\u6309\u4f4d\u6216\u7684\u7ed3\u679c\u5c31\u662f0000 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class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;sys\/types.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;sys\/stat.h&gt;<\/span><\/span><\/p>\n<p>mode_t <span class=\"token function\">umask<\/span><span class=\"token punctuation\">(<\/span>mode_t mask<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u53c2\u6570\u662f\u516b\u8fdb\u5236\u5f62\u5f0f\u7684\u65b0\u6743\u9650&#xff0c;\u8fd4\u56de\u65e7\u6743\u9650<\/span><\/p>\n<h4>close<\/h4>\n<p>\u7cfb\u7edf\u8c03\u7528close\u7684\u4f5c\u7528\u662f\u5173\u95ed\u6587\u4ef6\u3002\u5176\u51fd\u6570\u539f\u578b\u5982\u4e0b&#xff1a;<\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;unistd.h&gt;<\/span><\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> fd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u53c2\u6570&#xff1a;\u6587\u4ef6\u63cf\u8ff0\u7b26&#xff0c;\u8868\u793a\u8981\u5173\u95ed\u54ea\u4e00\u4e2a\u6587\u4ef6\u3002<\/p>\n<p>\u8fd4\u56de\u503c&#xff1a;\u6210\u529f\u8fd4\u56de0&#xff0c;\u5931\u8d25\u8fd4\u56de-1\u3002<\/p>\n<p>\u4ece\u8fd9\u91cc\u6211\u4eec\u4e5f\u4e0d\u96be\u770b\u51fa&#xff0c;\u6587\u4ef6\u63cf\u8ff0\u7b26\u4ee3\u8868\u4e86\u6587\u4ef6&#xff0c;\u5bf9\u6587\u4ef6\u7684\u5404\u79cd\u64cd\u4f5c\u9700\u8981\u914d\u5408\u6587\u4ef6\u63cf\u8ff0\u7b26\u8fdb\u884c\u3002<\/p>\n<hr \/>\n<p>\u6587\u4ef6\u6253\u5f00\u4e0e\u5173\u95ed\u4f7f\u7528\u793a\u4f8b&#xff1a;<\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;iostream&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;unistd.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;sys\/types.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;sys\/stat.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;fcntl.h&gt;<\/span><\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/\u4ee5\u5199\u7684\u65b9\u5f0f\u521b\u5efa\u4e00\u4e2a\u4e0d\u5b58\u5728\u7684\u6587\u4ef6<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> fd <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">open<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;test.txt&#034;<\/span><span class=\"token punctuation\">,<\/span> O_WRONLY <span class=\"token operator\">|<\/span> O_CREAT <span class=\"token operator\">|<\/span> O_TRUNC<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>fd <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token comment\">\/\/ \u8bf4\u660e\u6587\u4ef6\u6253\u5f00\u5931\u8d25<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        std<span class=\"token double-colon punctuation\">::<\/span>cerr <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;\u6587\u4ef6\u6253\u5f00\u5931\u8d25&#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/\u5173\u95ed\u6587\u4ef6<\/span><br \/>\n    <span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>fd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u8fd0\u884c\u7ed3\u679c&#xff1a; <img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/06\/20250603074556-683ea834b8934.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>\u53ef\u4ee5\u770b\u5230&#xff0c;\u5f53\u524d\u8def\u5f84\u4e0b\u51fa\u73b0\u4e86\u4e00\u4e2a\u53eb\u505a\u201ctest.txt\u201d\u7684\u6587\u4ef6\u3002<\/p>\n<h3>\u6587\u4ef6\u7684\u8bfb\u5199\u64cd\u4f5c<\/h3>\n<h4>write<\/h4>\n<p>write\u4e5f\u662f\u4e00\u4e2a\u7cfb\u7edf\u8c03\u7528&#xff0c;\u5b83\u7684\u529f\u80fd\u662f\u5411\u6587\u4ef6\u5199\u5165\u5185\u5bb9\u3002\u51fd\u6570\u539f\u578b\u5982\u4e0b&#xff1a;<\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;unistd.h&gt;<\/span><\/span><\/p>\n<p>ssize_t <span class=\"token function\">write<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> fd<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">const<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token operator\">*<\/span>buf<span class=\"token punctuation\">,<\/span> size_t count<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u53c2\u6570fd&#xff1a;\u8981\u5199\u5165\u6587\u4ef6\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26<\/p>\n<p>\u53c2\u6570buf&#xff1a;\u8981\u5199\u5165\u7684\u6570\u636e\u7684\u8d77\u59cb\u5730\u5740<\/p>\n<p>\u53c2\u6570count&#xff1a;\u8981\u5199\u5165\u7684\u6570\u636e\u7684\u5b57\u8282\u6570<\/p>\n<p>\u8fd4\u56de\u503c&#xff1a;\u6210\u529f\u65f6\u8fd4\u56de\u6210\u529f\u5199\u5165\u7684\u5b57\u8282\u6570&#xff1b;\u5931\u8d25\u65f6\u8fd4\u56de-1\u3002<\/p>\n<p>\u6ce8&#xff1a;\u5411\u6587\u4ef6\u5199\u5165\u5b57\u7b26\u4e32\u65f6&#xff0c;\u672b\u5c3e\u4e0d\u8981\u5e26\u2019\\\\0\u2019\u3002\u56e0\u4e3a\u5b57\u7b26\u4e32\u672b\u5c3e\u6709\u2019\\\\0\u2019\u662fC\/C&#043;&#043;\u7b49\u8bed\u8a00\u5c42\u9762\u7684\u6982\u5ff5&#xff0c;\u5e76\u975e\u7cfb\u7edf\u7ea7\u8981\u6c42&#xff0c;\u5728\u6587\u4ef6\u5f53\u4e2d\u6ca1\u6709\u610f\u4e49\u3002\u5176\u6b21&#xff0c;\u6211\u4eec\u5b66\u4e60C\u8bed\u8a00\u6587\u4ef6\u5199\u5165\u63a5\u53e3\u65f6&#xff0c;\u5206\u4e3a\u6587\u672c\u5199\u5165\u548c\u4e8c\u8fdb\u5236\u5199\u5165&#xff0c;\u4f46\u5176\u5b9e\u5728\u7cfb\u7edf\u5c42\u9762&#xff0c;\u5e76\u6ca1\u6709\u6587\u672c\u6587\u4ef6\u548c\u4e8c\u8fdb\u5236\u6587\u4ef6\u7684\u533a\u5206&#xff0c;\u672c\u8d28\u4e0a\u90fd\u662f\u5b57\u8282\u6d41\u7684\u5f62\u5f0f\u3002<\/p>\n<p>\u4f7f\u7528\u793a\u4f8b&#xff1a;<\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;iostream&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;unistd.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;sys\/types.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;sys\/stat.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;fcntl.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;cstring&gt;<\/span><\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/\u4ee5\u5199\u7684\u65b9\u5f0f\u521b\u5efa\u4e00\u4e2a\u4e0d\u5b58\u5728\u7684\u6587\u4ef6<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> fd <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">open<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;test.txt&#034;<\/span><span class=\"token punctuation\">,<\/span> O_WRONLY <span class=\"token operator\">|<\/span> O_CREAT <span class=\"token operator\">|<\/span> O_TRUNC<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>fd <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token comment\">\/\/ \u8bf4\u660e\u6587\u4ef6\u6253\u5f00\u5931\u8d25<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        std<span class=\"token double-colon punctuation\">::<\/span>cerr <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;\u6587\u4ef6\u6253\u5f00\u5931\u8d25&#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">const<\/span> <span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span> s <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;hello world&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">write<\/span><span class=\"token punctuation\">(<\/span>fd<span class=\"token punctuation\">,<\/span> s<span class=\"token punctuation\">,<\/span> <span class=\"token function\">strlen<\/span><span class=\"token punctuation\">(<\/span>s<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u5199\u5165<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/\u5173\u95ed\u6587\u4ef6<\/span><br \/>\n    <span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>fd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u8fd0\u884c\u7ed3\u679c&#xff1a;<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/06\/20250603074556-683ea834c0f2a.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h4>read<\/h4>\n<p>read\u7684\u4f5c\u7528\u662f\u4ece\u6587\u4ef6\u8bfb\u53d6\u5185\u5bb9\u3002\u51fd\u6570\u539f\u578b\u5982\u4e0b&#xff1a;<\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;unistd.h&gt;<\/span><\/span><\/p>\n<p>ssize_t <span class=\"token function\">read<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> fd<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token operator\">*<\/span>buf<span class=\"token punctuation\">,<\/span> size_t count<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u53c2\u6570fd&#xff1a;\u8981\u8bfb\u7684\u6587\u4ef6\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26<\/p>\n<p>\u53c2\u6570buf&#xff1a;\u8f93\u51fa\u578b\u53c2\u6570&#xff0c;\u63a5\u6536\u8bfb\u5165\u7684\u6570\u636e&#xff08;\u4e00\u822c\u662f\u5b57\u7b26\u6570\u7ec4\u6216\u7ed3\u6784\u5316\u6570\u636e\u7684\u5730\u5740&#xff09;<\/p>\n<p>\u53c2\u6570count&#xff1a;\u8981\u8bfb\u53d6\u7684\u5b57\u8282\u6570&#xff08;\u4e00\u822c\u662f\u5b57\u7b26\u6570\u7ec4\u6216\u7ed3\u6784\u5316\u6570\u636e\u7684\u5927\u5c0f&#xff09;<\/p>\n<p>\u8fd4\u56de\u503c&#xff1a;\u8fd4\u56de\u6210\u529f\u8bfb\u5165\u7684\u5b57\u8282\u6570&#xff0c;0\u8868\u793a\u8bfb\u5230\u6587\u4ef6\u672b\u5c3e&#xff0c;-1\u8868\u793a\u8bfb\u53d6\u9519\u8bef\u3002<\/p>\n<p>\u4f7f\u7528\u793a\u4f8b&#xff1a;<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/06\/20250603074556-683ea834ca125.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;iostream&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;unistd.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;sys\/types.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;sys\/stat.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;fcntl.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;cstring&gt;<\/span><\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/\u4ee5\u8bfb\u7684\u65b9\u5f0f\u6253\u5f00\u6587\u4ef6test.txt<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> fd <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">open<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;test.txt&#034;<\/span><span class=\"token punctuation\">,<\/span> O_RDONLY<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>fd <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        std<span class=\"token double-colon punctuation\">::<\/span>cerr <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;\u6587\u4ef6\u6253\u5f00\u5931\u8d25&#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">char<\/span> buffer<span class=\"token punctuation\">[<\/span><span class=\"token number\">128<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u521b\u5efa\u4e00\u4e2a\u7ed3\u6784\u5316\u6570\u636e&#xff0c;\u7528\u4e8e\u5c06\u6587\u4ef6\u8bfb\u5230\u5185\u5b58\u4e2d<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> n <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">read<\/span><span class=\"token punctuation\">(<\/span>fd<span class=\"token punctuation\">,<\/span> buffer<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>buffer<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#8211;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u7ed9&#039;\\\\0&#039;\u7559\u4e00\u4e2a\u4f4d\u7f6e<\/span><br \/>\n    <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>n <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/\u7531\u4e8e\u8bfb\u5165\u7684\u662f\u5b57\u7b26\u4e32&#xff0c;\u6240\u4ee5\u8bfb\u53d6\u4e4b\u540e\u5728\u672b\u5c3e\u52a0\u4e0a&#039;\\\\0&#039;<\/span><br \/>\n        buffer<span class=\"token punctuation\">[<\/span>n<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token char\">&#039;\\\\0&#039;<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/\u8f93\u51fa\u8bfb\u5230\u7684\u6570\u636e<\/span><br \/>\n        std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> buffer <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/\u5173\u95ed\u6587\u4ef6<\/span><br \/>\n    <span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>fd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u8fd0\u884c\u7ed3\u679c&#xff1a;<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/06\/20250603074556-683ea834d7987.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h2>\u4e09\u3001\u6587\u4ef6\u63cf\u8ff0\u7b26<\/h2>\n<p>\u521a\u624d\u5b66\u4e60\u7cfb\u7edf\u6587\u4ef6\u64cd\u4f5c\u63a5\u53e3\u65f6&#xff0c;\u6211\u4eec\u5df2\u7ecf\u521d\u6b65\u63a5\u89e6\u5230\u4e86\u201c\u6587\u4ef6\u63cf\u8ff0\u7b26\u201d\u3002\u6587\u4ef6\u63cf\u8ff0\u7b26\u5176\u5b9e\u5c31\u662f\u4e00\u4e2a\u6574\u6570&#xff0c;\u7528\u6765\u552f\u4e00\u6807\u8bc6\u5df2\u7ecf\u6253\u5f00\u7684\u6587\u4ef6&#xff0c;\u7cfb\u7edf\u8c03\u7528\u63a5\u53e3\u53ea\u901a\u8fc7\u6587\u4ef6\u63cf\u8ff0\u7b26\u6765\u533a\u5206\u6587\u4ef6\u3002<\/p>\n<p>C\u8bed\u8a00\u7684FILE\u7ed3\u6784\u4f53\u5185\u90e8\u5c31\u5c01\u88c5\u4e86\u6587\u4ef6\u63cf\u8ff0\u7b26&#xff0c;\u5bf9\u5e94\u6210\u5458\u53eb\u505a_fileno\u3002<\/p>\n<h3>\u9ed8\u8ba4\u6253\u5f00\u7684\u4e09\u4e2a\u6d41<\/h3>\n<p>\u4e4b\u524d\u5b66\u4e60C\u8bed\u8a00\u6587\u4ef6\u63a5\u53e3\u65f6&#xff0c;\u6211\u4eec\u77e5\u9053\u4e00\u4e2a\u7a0b\u5e8f\u542f\u52a8\u65f6\u4f1a\u9ed8\u8ba4\u6253\u5f00\u4e09\u4e2a\u6d41&#xff0c;\u5206\u522b\u662f\u6807\u51c6\u8f93\u5165\u6d41\u3001\u6807\u51c6\u8f93\u51fa\u6d41\u548c\u6807\u51c6\u9519\u8bef\u6d41&#xff0c;\u8fd9\u4e09\u4e2a\u6d41\u5206\u522b\u5bf9\u5e94\u6587\u4ef6\u63cf\u8ff0\u7b260\u30011\u30012\u3002\u4f60\u53ef\u80fd\u4f1a\u95ee&#xff1a;\u4e09\u4e2a\u6d41\u96be\u9053\u662f\u6587\u4ef6\u5417&#xff1f;\u5b9e\u9645\u4e0a\u662f\u5982\u6b64\u3002\u5728Linux\u4e0b&#xff0c;\u5728\u8fdb\u7a0b\u5c42\u9762\u6211\u4eec\u8ba4\u4e3a\u201c\u4e00\u5207\u7686\u6587\u4ef6\u201d&#xff0c;\u90a3\u4e48\u663e\u793a\u5668\u548c\u952e\u76d8\u4e5f\u53ef\u4ee5\u770b\u4f5c\u6587\u4ef6\u3002\u6211\u4eec\u80fd\u4ece\u952e\u76d8\u8f93\u5165\u6570\u636e&#xff0c;\u5b9e\u9645\u4e0a\u662f\u4ece\u201c\u952e\u76d8\u6587\u4ef6\u201d\u8bfb\u53d6\u6570\u636e&#xff1b;\u80fd\u5728\u663e\u793a\u5668\u4e0a\u770b\u5230\u6570\u636e&#xff0c;\u5b9e\u9645\u4e0a\u662f\u5411\u201c\u663e\u793a\u5668\u6587\u4ef6\u201d\u5199\u5165\u6570\u636e\u3002<\/p>\n<p>\u7531\u4e8e\u7a0b\u5e8f\u542f\u52a8\u65f6\u9ed8\u8ba4\u5c31\u6253\u5f00\u4e86\u8fd9\u4e09\u4e2a\u6d41&#xff0c;\u6240\u4ee5\u6211\u4eec\u5728\u8fdb\u884c\u952e\u76d8\u8f93\u5165\/\u663e\u793a\u5668\u8f93\u51fa\u65f6&#xff0c;\u65e0\u9700\u6253\u5f00\u6587\u4ef6\u3002\u8fd9\u4e09\u4e2a\u6d41\u5f53\u4e2d&#xff0c;\u6807\u51c6\u8f93\u5165\u6d41\u5bf9\u5e94\u952e\u76d8&#xff0c;\u800c\u6807\u51c6\u8f93\u51fa\u6d41\u548c\u6807\u51c6\u9519\u8bef\u6d41\u5bf9\u5e94\u663e\u793a\u5668\u3002<\/p>\n<p>\u6ce8&#xff1a;\u201c\u9ed8\u8ba4\u6253\u5f00\u8f93\u5165\u8f93\u51fa\u6d41\u201d\u7684\u7279\u6027\u5e76\u4e0d\u662f\u67d0\u79cd\u8bed\u8a00\u6240\u7279\u6709\u7684&#xff0c;\u800c\u662f\u64cd\u4f5c\u7cfb\u7edf\u652f\u6301\u7684\u3002<\/p>\n<p>\u63a5\u4e0b\u6765\u6211\u4eec\u5c1d\u8bd5\u5bf9\u63cf\u8ff0\u7b26\u4e3a0\u30011\u30012\u7684\u6587\u4ef6\u8fdb\u884c\u7b80\u5355\u64cd\u4f5c&#xff0c;\u9a8c\u8bc1\u521a\u624d\u7684\u8bf4\u6cd5&#xff1a;<\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;iostream&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;unistd.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;sys\/types.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;sys\/stat.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;fcntl.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;cstring&gt;<\/span><\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/\u4ece\u6807\u51c6\u8f93\u5165\u6d41\u8bfb\u53d6\u6570\u636e<\/span><br \/>\n    std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;\u8bf7\u8f93\u5165&#xff1a;&#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>flush<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">char<\/span> buff<span class=\"token punctuation\">[<\/span><span class=\"token number\">20<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> n <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">read<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> buff<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">sizeof<\/span><span class=\"token punctuation\">(<\/span>buff<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#8211;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/\u5411\u6807\u51c6\u8f93\u51fa\u6d41\u5199\u5165\u6570\u636e<\/span><br \/>\n    std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;\u6807\u51c6\u8f93\u51fa\u6d41&#xff1a;&#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>flush<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">write<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> buff<span class=\"token punctuation\">,<\/span> n<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/\u5411\u6807\u51c6\u9519\u8bef\u6d41\u5199\u5165\u6570\u636e<\/span><br \/>\n    std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;\u6807\u51c6\u9519\u8bef\u6d41&#xff1a;&#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>flush<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">write<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> buff<span class=\"token punctuation\">,<\/span> n<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u8fd0\u884c\u7ed3\u679c&#xff1a;<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/06\/20250603074556-683ea834e8e30.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>\u6ce8&#xff1a;\u8fd9\u91cc\u6211\u4eec\u867d\u7136\u6ca1\u6709\u663e\u5f0f\u8f93\u51fa\u6362\u884c\u7b26&#xff0c;\u4f46\u662f\u5b83\u4eec\u8fd8\u662f\u81ea\u52a8\u5206\u6210\u4e86\u4e09\u884c&#xff0c;\u539f\u56e0\u662fread\u662f\u4ee5\u5b57\u8282\u6d41\u7684\u65b9\u5f0f\u8bfb\u5165\u7684&#xff0c;\u6211\u4eec\u4ece\u952e\u76d8\u8f93\u5165\u6570\u636e\u65f6&#xff0c;\u6309\u4e0bEnter\u65f6\u5c06\u6362\u884c\u7b26\u4e5f\u8bfb\u8fdb\u4e86buff&#xff0c;\u56e0\u6b64\u8f93\u51fa\u65f6\u4e5f\u5e26\u4e0a\u4e86\u6362\u884c\u7b26\u3002<\/p>\n<h3>\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u672c\u8d28\u4e0e\u6587\u4ef6\u7684\u6253\u5f00\u8fc7\u7a0b<\/h3>\n<p>\u5f88\u660e\u663e&#xff0c;\u4e00\u4e2a\u8fdb\u7a0b\u53ef\u4ee5\u6253\u5f00\u591a\u4e2a\u6587\u4ef6\u3002\u800c\u64cd\u4f5c\u7cfb\u7edf\u4e2d\u5b58\u5728\u7740\u5927\u91cf\u8fdb\u7a0b&#xff0c;\u4e5f\u5c31\u610f\u5473\u7740\u64cd\u4f5c\u7cfb\u7edf\u4e2d\u5b58\u5728\u8005\u5927\u91cf\u5df2\u6253\u5f00\u7684\u6587\u4ef6\u3002<\/p>\n<p>\u5c31\u50cf\u7ba1\u7406\u8fdb\u7a0b\u4e00\u6837&#xff0c;\u64cd\u4f5c\u7cfb\u7edf\u5fc5\u7136\u8981\u5bf9\u8fd9\u4e9b\u6587\u4ef6\u8fdb\u884c\u7ba1\u7406\u3002\u56e0\u6b64&#xff0c;\u5c31\u4e00\u5b9a\u6709\u63cf\u8ff0\u6587\u4ef6\u7684\u7ed3\u6784\u4f53&#xff0c;\u8fd8\u6709\u6570\u636e\u7ed3\u6784\u5c06\u8fd9\u4e9b\u7ed3\u6784\u4f53\u7ec4\u7ec7\u8d77\u6765\u3002\u5728Linux\u4e0b&#xff0c;\u8be5\u7ed3\u6784\u4f53\u53eb\u505astruct file&#xff0c;\u4ee3\u8868\u88ab\u6253\u5f00\u7684\u6587\u4ef6\u3002<\/p>\n<p>\u90a3\u4e48&#xff0c;\u65e2\u7136\u662f\u8fdb\u7a0b\u6253\u5f00\u4e86\u6587\u4ef6&#xff0c;\u90a3\u4e48\u8fdb\u7a0b\u548c\u6587\u4ef6\u7684\u5bf9\u5e94\u5173\u7cfb\u662f\u5982\u4f55\u5f62\u6210\u7684\u5462&#xff1f;<\/p>\n<p>\u5b9e\u9645\u4e0atask_struct\u4e2d\u6709\u4e00\u4e2afiles_struct*\u7c7b\u578b\u7684\u6307\u9488&#xff0c;\u53eb\u505afiles&#xff0c;\u5b83\u6307\u5411\u4e00\u4e2astruct files_struct\u7ed3\u6784\u4f53&#xff0c;\u8be5\u7ed3\u6784\u4f53\u53eb\u505a\u201c\u6587\u4ef6\u63cf\u8ff0\u7b26\u8868\u201d\u3002\u6587\u4ef6\u63cf\u8ff0\u7b26\u8868\u5c31\u8868\u793a\u4e86\u5f53\u524d\u8fdb\u7a0b\u6253\u5f00\u7684\u6240\u6709\u6587\u4ef6\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/06\/20250603074557-683ea83501007.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>\u6587\u4ef6\u63cf\u8ff0\u7b26\u8868\u7ed3\u6784\u5f53\u4e2d&#xff0c;\u6709\u4e00\u4e2a\u6307\u9488\u6570\u7ec4\u53eb\u505afd_array&#xff0c;\u5b83\u7684\u6307\u9488\u7c7b\u578b\u662ffile*&#xff0c;\u521a\u597d\u6307\u5411struct file\u7ed3\u6784\u4f53&#xff0c;\u8fd9\u6837\u8fdb\u7a0b\u548c\u6587\u4ef6\u5c31\u5f7b\u5e95\u8fde\u63a5\u8d77\u6765\u4e86\u3002<\/p>\n<p>\u5230\u8fd9\u91cc&#xff0c;\u6211\u4eec\u5c31\u4e0d\u96be\u5f97\u51fa\u7ed3\u8bba&#xff1a;\u6587\u4ef6\u63cf\u8ff0\u7b26\u5c31\u662ffd_array\u7684\u6570\u7ec4\u4e0b\u6807\u3002\u6211\u4eec\u4f20\u5165\u6587\u4ef6\u63cf\u8ff0\u7b26&#xff0c;\u7cfb\u7edf\u5185\u90e8\u5c31\u5c06\u5176\u5f53\u4f5c\u4e0b\u6807\u6765\u8bbf\u95eefd_array&#xff0c;\u8fdb\u800c\u8bbf\u95ee\u5bf9\u5e94\u7684\u6587\u4ef6&#xff08;struct file\u7ed3\u6784\u4f53&#xff09;\u3002<\/p>\n<p>\u56e0\u6b64&#xff0c;\u5f53\u4e00\u4e2a\u6587\u4ef6\u88ab\u6253\u5f00\u65f6&#xff0c;\u8981\u5148\u5c06\u8be5\u6587\u4ef6\u4ece\u78c1\u76d8\u52a0\u8f7d\u5230\u5185\u5b58\u4e2d&#xff08;\u6570\u636e\u62f7\u8d1d&#xff09;&#xff0c;\u5f62\u6210\u5bf9\u5e94struct file\u7ed3\u6784\u4f53&#xff0c;\u7136\u540e\u5728fd_array\u4e2d\u5206\u914d\u4e00\u4e2a\u6307\u9488&#xff0c;\u6307\u5411file\u7ed3\u6784\u4f53\u3002\u540e\u7eed\u5c31\u53ef\u4ee5\u4f7f\u7528\u8be5\u6307\u9488\u5bf9\u5e94\u7684\u4e0b\u6807&#xff08;\u4e5f\u5c31\u662f\u6587\u4ef6\u63cf\u8ff0\u7b26&#xff09;&#xff0c;\u5bf9\u6587\u4ef6\u8fdb\u884c\u64cd\u4f5c\u4e86\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/06\/20250603074557-683ea83570ee3.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>\u90a3\u4e48&#xff0c;\u5982\u679c\u5173\u95ed\u6587\u4ef6&#xff0c;\u8be5\u6587\u4ef6\u6240\u5bf9\u5e94\u7684struct 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directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;iostream&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;unistd.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;sys\/types.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;sys\/stat.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;fcntl.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;cstring&gt;<\/span><\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> fd1 <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">open<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;test1.txt&#034;<\/span><span class=\"token punctuation\">,<\/span> O_WRONLY <span class=\"token operator\">|<\/span> O_CREAT <span class=\"token operator\">|<\/span> O_TRUNC<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0666<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;fd1 : &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> fd1 <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">int<\/span> fd2 <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">open<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;test2.txt&#034;<\/span><span class=\"token punctuation\">,<\/span> O_WRONLY <span class=\"token operator\">|<\/span> O_CREAT <span class=\"token operator\">|<\/span> O_TRUNC<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0666<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;fd2 : &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> fd2 <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/\u5173\u95ed\u6807\u51c6\u8f93\u5165\u6d41<\/span><br \/>\n    <span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">int<\/span> fd3 <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">open<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;test3.txt&#034;<\/span><span class=\"token punctuation\">,<\/span> O_WRONLY <span class=\"token operator\">|<\/span> O_CREAT <span class=\"token operator\">|<\/span> O_TRUNC<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0666<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;fd3 : &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> fd3 <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">int<\/span> fd4 <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">open<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;test4.txt&#034;<\/span><span class=\"token punctuation\">,<\/span> O_WRONLY <span class=\"token operator\">|<\/span> O_CREAT <span class=\"token operator\">|<\/span> O_TRUNC<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0666<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;fd4 : &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> fd4 <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">int<\/span> fd5 <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">open<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;test5.txt&#034;<\/span><span class=\"token punctuation\">,<\/span> O_WRONLY <span class=\"token operator\">|<\/span> O_CREAT <span class=\"token operator\">|<\/span> O_TRUNC<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0666<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;fd5 : &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> fd5 <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>fd1<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>fd2<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>fd3<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>fd4<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>fd5<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/06\/20250603074558-683ea83632a22.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" 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property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;iostream&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;unistd.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;sys\/types.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;sys\/stat.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;fcntl.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;cstring&gt;<\/span><\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u5173\u95ed\u6807\u51c6\u8f93\u51fa\u6d41<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> fd <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">open<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;test.txt&#034;<\/span><span class=\"token punctuation\">,<\/span> O_WRONLY <span class=\"token operator\">|<\/span> O_CREAT <span class=\"token operator\">|<\/span> O_TRUNC<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0666<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>fd <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        std<span class=\"token double-colon punctuation\">::<\/span>cerr <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;open error&#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;hello world&#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>fd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u4e0a\u8ff0\u4ee3\u7801\u4e2d&#xff0c;\u6211\u4eec\u9996\u5148\u5173\u95ed\u4e86\u6807\u51c6\u8f93\u51fa\u6d41&#xff0c;\u7136\u540e\u521b\u5efa\u4e86\u4e00\u4e2a\u65b0\u6587\u4ef6\u3002\u6309\u7167\u5206\u914d\u89c4\u5219&#xff0c;\u5219\u65b0\u6587\u4ef6\u4f1a\u5360\u636e\u539f\u672c\u6807\u51c6\u8f93\u51fa\u6d41\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u201c1\u201d&#xff0c;\u6b64\u65f6\u6211\u4eec\u518d\u4f7f\u7528cout\u5411\u6807\u51c6\u8f93\u51fa\u6d41\u6253\u5370\u3002\u7ed3\u679c\u5982\u4e0b&#xff1a;<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/06\/20250603074558-683ea8363f63d.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>\u53ef\u4ee5\u770b\u5230&#xff0c;\u51fa\u73b0\u4e86\u4e00\u4e2a\u6587\u4ef6&#xff0c;\u5176\u5185\u5bb9\u5305\u542b\u4e86\u6211\u4eec\u8981\u6253\u5370\u7684\u5b57\u7b26\u4e32\u3002\u5176\u5b9e\u8fd9\u79cd\u64cd\u4f5c\u5c31\u53eb\u505a\u201c\u8f93\u51fa\u91cd\u5b9a\u5411\u201d\u3002\u7531\u4e8e\u6807\u51c6\u8f93\u51fa\u53ea\u9488\u5bf9\u4e0e\u6587\u4ef6\u63cf\u8ff0\u7b26\u4e3a1\u7684\u6587\u4ef6&#xff0c;\u6240\u4ee5\u91cd\u5b9a\u5411\u64cd\u4f5c\u662f\u5c06fd_array\u6570\u7ec4\u4e0b\u6807\u4e3a1\u7684\u6307\u9488\u6307\u5411\u4fee\u6539\u5230\u5176\u4ed6\u6587\u4ef6&#xff0c;\u5bfc\u81f4\u6807\u51c6\u8f93\u51fa\u4e0d\u518d\u4f5c\u7528\u4e8e\u663e\u793a\u5668\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/06\/20250603074558-683ea83647e70.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>\u5f53\u7136&#xff0c;\u540c\u6837\u7684\u539f\u7406\u4e5f\u53ef\u5b9e\u73b0\u201c\u8f93\u5165\u91cd\u5b9a\u5411\u201d\u201c\u8ffd\u52a0\u91cd\u5b9a\u5411&#xff08;\u4e0d\u6e05\u7a7a\u91cd\u5b9a\u5411\u7684\u6587\u4ef6\u8fdb\u884c\u8ffd\u52a0\u5199\u5165&#xff09;\u201d\u7b49\u64cd\u4f5c\u3002<\/p>\n<p>Linux\u4e0b&#xff0c;\u6709\u5e2e\u52a9\u6211\u4eec\u8fdb\u884c\u91cd\u5b9a\u5411\u7684\u7cfb\u7edf\u8c03\u7528&#xff1a;<\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;unistd.h&gt;<\/span><\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">dup2<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> oldfd<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> newfd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u8be5\u51fd\u6570\u4f1a\u8ba9\u6587\u4ef6\u63cf\u8ff0\u7b26newfd\u6240\u5bf9\u5e94\u7684\u6307\u9488\u6307\u5411oldfd\u6240\u5bf9\u5e94\u7684\u6587\u4ef6\u3002\u5982\u679c\u6210\u529f&#xff0c;\u8fd4\u56denewfd&#xff1b;\u5426\u5219\u8fd4\u56de-1\u3002\u6ce8\u610f&#xff1a;oldfd\u5fc5\u987b\u662f\u4e00\u4e2a\u6709\u6548\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u3002<\/p>\n<p>\u4f7f\u7528\u793a\u4f8b&#xff1a;<\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;iostream&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;unistd.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;sys\/types.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;sys\/stat.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;fcntl.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;cstring&gt;<\/span><\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> fd <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">open<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;test.txt&#034;<\/span><span class=\"token punctuation\">,<\/span> O_WRONLY <span class=\"token operator\">|<\/span> O_CREAT <span class=\"token operator\">|<\/span> O_TRUNC<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0666<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>fd <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        std<span class=\"token double-colon punctuation\">::<\/span>cerr <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;open error&#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token function\">dup2<\/span><span class=\"token punctuation\">(<\/span>fd<span class=\"token punctuation\">,<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u8ba9\u6807\u51c6\u8f93\u51fa\u6307\u5411\u521b\u5efa\u7684\u65b0\u6587\u4ef6<\/span><\/p>\n<p>    std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;hello world&#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>fd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h2>\u56db\u3001\u7f13\u51b2\u533a<\/h2>\n<p>\u4e4b\u524d\u6211\u4eec\u5b66\u4e60C\u8bed\u8a00\u65f6&#xff0c;\u5c31\u5df2\u7ecf\u63a5\u89e6\u8fc7\u201c\u7f13\u51b2\u533a\u201d\u7684\u6982\u5ff5&#xff0c;\u4eca\u5929\u6211\u4eec\u5c31\u7ed3\u5408\u5bf9\u5185\u5b58\u7ea7\u6587\u4ef6\u7684\u4e86\u89e3&#xff0c;\u6df1\u5165\u5b66\u4e60\u4e00\u4e0b\u7f13\u51b2\u533a\u3002<\/p>\n<p>\u7f13\u51b2\u533a\u7684\u672c\u8d28\u5c31\u662f\u4e00\u5757\u5185\u5b58\u533a\u57df\u3002\u5728\u64cd\u4f5c\u7cfb\u7edf\u4e2d&#xff0c;\u5b9e\u9645\u4e0a\u6709\u4e24\u79cd\u4e0d\u540c\u7684\u7f13\u51b2\u533a&#xff1a;\u8bed\u8a00\u7ea7\u7f13\u51b2\u533a\u548c\u6587\u4ef6\u5185\u6838\u7f13\u51b2\u533a\u3002<\/p>\n<p>\u4ee5C\u8bed\u8a00\u4e3e\u4f8b&#xff0c;\u521b\u5efa\u6587\u4ef6\u65f6\u8981\u8c03\u7528fopen\u51fd\u6570&#xff0c;\u5b83\u8fd4\u56de\u4e00\u4e2aFILE*\u6307\u9488\u3002\u6b64\u65f6&#xff0c;\u64cd\u4f5c\u7cfb\u7edf\u5f53\u4e2d\u5c31\u4f1a\u51fa\u73b0\u4e00\u4e2aFILE\u7ed3\u6784\u5bf9\u8c61&#xff0c;\u7528\u6765\u5728\u8bed\u8a00\u5c42\u7ba1\u7406\u6587\u4ef6&#xff08;\u4f8b\u5982\u4e4b\u524d\u63d0\u5230\u7684_fileno\u5c01\u88c5&#xff09;\u3002\u800cC\u8bed\u8a00\u8bed\u8a00\u5c42\u7684\u7f13\u51b2\u533a\u5c31\u5b58\u5728\u4e8eFILE\u7ed3\u6784\u4f53\u4e2d\u3002\u5f53\u51fa\u73b0\u4ee5\u4e0b\u4e09\u79cd\u60c5\u51b5\u4e4b\u4e00&#xff0c;\u7f13\u51b2\u533a\u5185\u7684\u6570\u636e\u5c31\u4f1a\u88ab\u5237\u65b0&#xff0c;\u5199\u5165\u5230\u7cfb\u7edf\u7ea7\u7684\u6587\u4ef6\u5185\u6838\u7f13\u51b2\u533a\u4e2d&#xff1a;<\/p>\n<ul>\n<li>\u5f3a\u5236\u5237\u65b0&#xff08;\u5982\u8c03\u7528fflush&#xff09;<\/li>\n<li>\u6ee1\u8db3\u4ee5\u4e0b\u5237\u65b0\u6761\u4ef6\u4e4b\u4e00\n<li>\u5904\u4e8e\u5199\u900f\u6a21\u5f0f \u2013 \u6ca1\u6709\u7f13\u51b2\u673a\u5236&#xff0c;\u7acb\u5373\u5237\u65b0<\/li>\n<li>\u7f13\u51b2\u533a\u6ee1\u4e86<\/li>\n<li>\u884c\u7f13\u51b2&#xff08;\u6362\u884c\u65f6\u7f13\u51b2&#xff0c;\u4e00\u822c\u9488\u5bf9\u663e\u793a\u5668&#xff09;<\/li>\n<\/li>\n<li>\u8fdb\u7a0b\u9000\u51fa<\/li>\n<\/ul>\n<p>\u800c\u6587\u4ef6\u5185\u6838\u7f13\u51b2\u533a\u7684\u5237\u65b0\u7b56\u7565\u5341\u5206\u590d\u6742&#xff0c;\u6211\u4eec\u53ef\u4ee5\u7406\u89e3\u4e3a\u53ea\u8981\u4ece\u8bed\u8a00\u5c42\u7f13\u51b2\u533a\u5237\u65b0\u5230\u6587\u4ef6\u7f13\u51b2\u533a&#xff0c;\u5c31\u76f8\u5f53\u4e8e\u5c06\u6570\u636e\u4ea4\u7ed9\u4e86\u786c\u4ef6\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/06\/20250603074558-683ea836d634b.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>\u5176\u5b9e\u4e0d\u9700\u8981\u7f13\u51b2\u533a&#xff0c;\u5c31\u53ef\u4ee5\u5b9e\u73b0\u8bed\u8a00\u5c42\u5230\u786c\u4ef6\u5c42\u7684\u6570\u636e\u4ea4\u4e92\u3002\u90a3\u4e48\u4e3a\u4ec0\u4e48\u4f1a\u5b58\u5728\u7f13\u51b2\u533a\u5462&#xff1f;<\/p>\n<ul>\n<li>\u8bed\u8a00\u5c42\u7f13\u51b2\u533a\u5b58\u5728\u7684\u610f\u4e49&#xff1a;\u5c06\u6570\u636e\u5199\u5165\u6587\u4ef6\u5fc5\u987b\u901a\u8fc7\u7cfb\u7edf\u8c03\u7528&#xff0c;\u9891\u7e41\u4f7f\u7528\u7cfb\u7edf\u8c03\u7528\u7684\u65f6\u95f4\u6210\u672c\u8fc7\u9ad8&#xff0c;\u4f7f\u7528\u8bed\u8a00\u5c42\u7f13\u51b2\u533a\u5c06\u591a\u6b21\u5199\u5165\u7684\u6570\u636e\u6536\u96c6\u8d77\u6765&#xff0c;\u518d\u7edf\u4e00\u5199\u5165&#xff0c;\u663e\u8457\u51cf\u5c11\u4e86\u4f7f\u7528\u7cfb\u7edf\u8c03\u7528\u7684\u6b21\u6570&#xff0c;\u63d0\u9ad8\u6548\u7387\u3002<\/li>\n<li>\u6587\u4ef6\u5185\u6838\u7f13\u51b2\u533a\u5b58\u5728\u7684\u610f\u4e49&#xff1a;\u63d0\u9ad8\u7cfb\u7edf\u8c03\u7528\u7684\u8fd0\u884c\u6548\u7387\u3002<\/li>\n<\/ul>\n<p>\u6ce8&#xff1a;\u5982\u679c\u8fdb\u884c\u4e86\u91cd\u5b9a\u5411&#xff0c;\u90a3\u4e48\u5bf9\u5e94\u6587\u4ef6\u7684\u7f13\u51b2\u533a\u5237\u65b0\u7b56\u7565\u4e5f\u4f1a\u4fee\u6539&#xff0c;\u56e0\u4e3a\u6587\u4ef6\u88ab\u6362\u8d70\u4e86&#xff0c;\u4e0d\u540c\u7684\u6587\u4ef6&#xff0c;\u7f13\u51b2\u533a\u5237\u65b0\u7b56\u7565\u53ef\u80fd\u4e0d\u540c\u3002<\/p>\n<p>Linux\u7684\u7cfb\u7edf\u8c03\u7528fsync\u53ef\u4ee5\u5c06\u6587\u4ef6\u7f13\u51b2\u533a\u7684\u6570\u636e\u5237\u65b0\u5230\u5916\u8bbe\u5f53\u4e2d&#xff1a;<\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;unistd.h&gt;<\/span><\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">fsync<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> fd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u4f20\u5165\u5bf9\u5e94\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26<\/span><\/p>\n<h3>\u5c0f\u7ec3\u4e60<\/h3>\n<p>\u5224\u65ad\u4ee5\u4e0b\u4ee3\u7801\u7684\u8fd0\u884c\u7ed3\u679c&#xff1a;<\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;iostream&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;unistd.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;sys\/types.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;sys\/stat.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;fcntl.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;cstring&gt;<\/span><\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> fd <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">open<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;test.txt&#034;<\/span><span class=\"token punctuation\">,<\/span> O_WRONLY <span class=\"token operator\">|<\/span> O_CREAT <span class=\"token operator\">|<\/span> O_TRUNC<span class=\"token punctuation\">,<\/span> <span class=\"token number\">0666<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>fd <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        std<span class=\"token double-colon punctuation\">::<\/span>cerr <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;open error&#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token function\">dup2<\/span><span class=\"token punctuation\">(<\/span>fd<span class=\"token punctuation\">,<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u8f93\u51fa\u91cd\u5b9a\u5411<\/span><\/p>\n<p>    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;printf\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">fprintf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token constant\">stdout<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;fprintf\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">const<\/span> <span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span> s <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;write\\\\n&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    size_t len <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">strlen<\/span><span class=\"token punctuation\">(<\/span>s<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">write<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> s<span class=\"token punctuation\">,<\/span> len<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token function\">fork<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u521b\u5efa\u5b50\u8fdb\u7a0b<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u8fd0\u884c\u7ed3\u679c&#xff1a;<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/06\/20250603074559-683ea8372bc38.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" 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