{"id":37837,"date":"2025-05-18T01:06:03","date_gmt":"2025-05-17T17:06:03","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/37837.html"},"modified":"2025-05-18T01:06:03","modified_gmt":"2025-05-17T17:06:03","slug":"%e3%80%90linux%e7%b3%bb%e7%bb%9f%e3%80%91%e4%bb%8e-c-%e8%af%ad%e8%a8%80%e6%96%87%e4%bb%b6%e6%93%8d%e4%bd%9c%e5%88%b0%e7%b3%bb%e7%bb%9f%e8%b0%83%e7%94%a8%e7%9a%84%e6%a0%b8%e5%bf%83%e5%8e%9f%e7%90%86","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/37837.html","title":{"rendered":"\u3010Linux\u7cfb\u7edf\u3011\u4ece C \u8bed\u8a00\u6587\u4ef6\u64cd\u4f5c\u5230\u7cfb\u7edf\u8c03\u7528\u7684\u6838\u5fc3\u539f\u7406"},"content":{"rendered":"<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/05\/20250517170602-6828c1fa535c4.gif\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<\/p>\n<h4>\u6587\u7ae0\u76ee\u5f55<\/h4>\n<ul>\n<li>\u524d\u8a00<\/li>\n<li>lesson 15_\u57fa\u7840IO<\/li>\n<li>\n<ul>\n<li>\u4e00\u3001\u5171\u8bc6\u539f\u7406<\/li>\n<li>\u4e8c\u3001\u56de\u987eC\u8bed\u8a00\u63a5\u53e3<\/li>\n<li>\n<ul>\n<li>2.1 \u6587\u4ef6\u7684\u6253\u5f00\u64cd\u4f5c<\/li>\n<li>2.2 \u6587\u4ef6\u7684\u8bfb\u53d6\u4e0e\u5199\u5165\u64cd\u4f5c<\/li>\n<li>2.3 \u4e09\u4e2a\u6807\u51c6\u8f93\u5165\u8f93\u51fa\u6d41<\/li>\n<\/ul>\n<\/li>\n<li>\u4e09\u3001\u8fc7\u6e21\u5230\u7cfb\u7edf&#xff0c;\u8ba4\u8bc6\u6587\u4ef6\u7cfb\u7edf\u8c03\u7528<\/li>\n<li>\n<ul>\n<li>3.1 &#096;open&#096; \u7cfb\u7edf\u8c03\u7528<\/li>\n<li>\n<ul>\n<li>1. \u6bd4\u7279\u4f4d\u6807\u5fd7\u4f4d\u793a\u4f8b<\/li>\n<\/ul>\n<\/li>\n<li>3.2 &#096;write&#096; \u7cfb\u7edf\u8c03\u7528<\/li>\n<li>\n<ul>\n<li>1. \u6a21\u62df\u5b9e\u73b0 &#096;w&#096; \u9009\u9879<\/li>\n<li>2. \u6a21\u62df\u5b9e\u73b0 &#096;a&#096; \u9009\u9879<\/li>\n<\/ul>\n<\/li>\n<li>3.3 &#096;read&#096; \u7cfb\u7edf\u8c03\u7528<\/li>\n<\/ul>\n<\/li>\n<li>\u56db\u3001\u8bbf\u95ee\u6587\u4ef6\u7684\u672c\u8d28<\/li>\n<\/ul>\n<\/li>\n<li>\u7ed3\u8bed<\/li>\n<\/ul>\n<hr \/>\n<h2>\u524d\u8a00<\/h2>\n<p>\u672c\u6587\u5c06\u4ece\u6587\u4ef6\u7684\u57fa\u672c\u6982\u5ff5\u51fa\u53d1&#xff0c;\u5148\u56de\u987e C \u8bed\u8a00\u4e2d\u6587\u4ef6\u64cd\u4f5c\u7684\u5e38\u7528\u63a5\u53e3&#xff0c;\u518d\u9010\u6b65\u8fc7\u6e21\u5230 Linux \u7cfb\u7edf\u8c03\u7528&#xff0c;\u89e3\u6790\u6587\u4ef6\u63cf\u8ff0\u7b26\u3001\u6587\u4ef6\u6253\u5f00\u5bf9\u8c61\u3001\u8fdb\u7a0b\u4e0e\u6587\u4ef6\u7684\u5173\u7cfb\u7b49\u5173\u952e\u6982\u5ff5\u3002\u901a\u8fc7\u4ee3\u7801\u793a\u4f8b\u548c\u539f\u7406\u5206\u6790&#xff0c;\u5e26\u4f60\u63ed\u5f00 Linux \u57fa\u7840 IO \u7684\u795e\u79d8\u9762\u7eb1&#xff0c;\u7406\u89e3\u64cd\u4f5c\u7cfb\u7edf\u5982\u4f55\u7ba1\u7406\u6587\u4ef6\u3001\u8fdb\u7a0b\u5982\u4f55\u4e0e\u6587\u4ef6\u4ea4\u4e92\u7684\u5e95\u5c42\u903b\u8f91\u3002<\/p>\n<hr \/>\n<h2>lesson 15_\u57fa\u7840IO<\/h2>\n<h3>\u4e00\u3001\u5171\u8bc6\u539f\u7406<\/h3>\n<ul>\n<li>\n<p>\u6587\u4ef6 &#061; \u5185\u5bb9 &#043; \u5c5e\u6027\u3002<\/p>\n<\/li>\n<li>\n<p>\u6587\u4ef6\u5206\u4e3a \u6253\u5f00\u7684\u6587\u4ef6 \u548c \u6ca1\u6253\u5f00\u7684\u6587\u4ef6\u3002<\/p>\n<\/li>\n<li>\n<p>\u6253\u5f00\u7684\u6587\u4ef6&#xff1a;\u8c01\u6253\u5f00\u7684&#xff1f;\u8fdb\u7a0b&#xff01;\u2014\u2014 \u672c\u8d28\u662f\u7814\u7a76\u8fdb\u7a0b\u548c\u6587\u4ef6\u7684\u5173\u7cfb\u3002<\/p>\n<\/li>\n<li>\n<p>\u6ca1\u6253\u5f00\u7684\u6587\u4ef6&#xff1a;\u5728\u54ea\u91cc\u653e\u7740\u5462&#xff1f;\u5728\u78c1\u76d8\u4e0a\u3002\u6211\u4eec\u6700\u5173\u6ce8\u7684\u95ee\u9898&#xff1f;\u6ca1\u6709\u88ab\u6253\u5f00\u7684\u6587\u4ef6\u975e\u5e38\u591a&#xff0c;\u6587\u4ef6\u5982\u4f55\u88ab\u5206\u95e8\u522b\u7c7b\u7684\u653e\u7f6e\u597d&#xff08;\u5982\u4f55\u5b58\u50a8&#xff09; \u2014\u2014 \u6211\u4eec\u8981\u5feb\u901f\u7684\u8fdb\u884c\u589e\u5220\u67e5\u6539 \u2014\u2014 \u5feb\u901f\u627e\u5230\u6587\u4ef6\u3002<\/p>\n<\/li>\n<li>\n<p>\u6587\u4ef6\u88ab\u6253\u5f00&#xff0c;\u5fc5\u987b\u5148\u88ab\u52a0\u8f7d\u5230\u5185\u5b58&#xff01;<\/p>\n<\/li>\n<li>\n<p>\u8fdb\u7a0b&#xff1a;\u6253\u5f00\u7684\u6587\u4ef6 &#061; 1&#xff1a;n\u3002<\/p>\n<\/li>\n<\/ul>\n<p>\u5c0f\u7ed3&#xff1a;\u64cd\u4f5c\u7cfb\u7edf\u5185\u90e8&#xff0c;\u4e00\u5b9a\u5b58\u5728\u5927\u91cf\u7684\u522b\u6253\u5f00\u7684\u6587\u4ef6&#xff01;\u2014\u2014 OS \u8981\u4e0d\u8981\u7ba1\u7406\u8fd9\u4e9b\u88ab\u6253\u5f00\u7684\u6587\u4ef6\u5462&#xff1f; \u2014\u2014 \u600e\u4e48\u7ba1\u7406&#xff1f;&#xff1f;&#xff1f;\u2014\u2014 \u5148\u63cf\u8ff0&#xff0c;\u5728\u7ec4\u7ec7\u3002\u2014\u2014 \u5728\u5185\u6838\u4e2d&#xff0c;\u4e00\u4e2a\u88ab\u6253\u5f00\u7684\u6587\u4ef6\u90fd\u5fc5\u987b\u6709\u81ea\u5df1\u7684\u6587\u4ef6\u6253\u5f00\u5bf9\u8c61&#xff0c;\u5305\u542b\u6587\u4ef6\u7684\u5f88\u591a\u5c5e\u6027\u3002struct XXX{\u6587\u4ef6\u5c5e\u6027&#xff1b;struct XXX *next};<\/p>\n<h3>\u4e8c\u3001\u56de\u987eC\u8bed\u8a00\u63a5\u53e3<\/h3>\n<h4>2.1 \u6587\u4ef6\u7684\u6253\u5f00\u64cd\u4f5c<\/h4>\n<ul>\n<li>\n<p>fopen \u51fd\u6570\u7528\u4e8e\u6253\u5f00\u6587\u4ef6&#xff0c;\u683c\u5f0f\u4e3a<\/p>\n<ul>\n<li> FILE <span class=\"token operator\">*<\/span><span class=\"token function\">fopen<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">const<\/span> <span class=\"token keyword\">char<\/span> <span class=\"token operator\">*<\/span>path<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">const<\/span> <span class=\"token keyword\">char<\/span> <span class=\"token operator\">*<\/span>mode<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\n <\/li>\n<li>\n<p>path: \u6587\u4ef6\u8def\u5f84\u6216\u6587\u4ef6\u540d\u3002\u5982\u679c\u53ea\u6709\u6587\u4ef6\u540d&#xff0c;\u64cd\u4f5c\u7cfb\u7edf\u4f1a\u5728\u5f53\u524d\u5de5\u4f5c\u76ee\u5f55&#xff08;cwd&#xff09;\u4e0b\u67e5\u627e\u8be5\u6587\u4ef6\u3002<\/p>\n<\/li>\n<li>\n<p>mode: \u6587\u4ef6\u6253\u5f00\u6a21\u5f0f\u3002\u5e38\u89c1\u6a21\u5f0f\u6709&#xff1a;<\/p>\n<ul>\n<li>w: \u5982\u679c\u6587\u4ef6\u5df2\u5b58\u5728&#xff0c;\u5148\u6e05\u7a7a\u6587\u4ef6\u518d\u5199\u5165\u3002\u5982\u679c\u6587\u4ef6\u4e0d\u5b58\u5728&#xff0c;\u521b\u5efa\u65b0\u6587\u4ef6\u3002<\/li>\n<li>a: \u4ee5\u8ffd\u52a0\u6a21\u5f0f\u6253\u5f00\u6587\u4ef6&#xff0c;\u5728\u6587\u4ef6\u672b\u5c3e\u6dfb\u52a0\u5185\u5bb9\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>\u5f53\u524d\u8def\u5f84 (cwd): \u6bcf\u4e2a\u8fdb\u7a0b\u7ef4\u62a4\u4e00\u4e2a\u5f53\u524d\u5de5\u4f5c\u76ee\u5f55&#xff0c;\u64cd\u4f5c\u7cfb\u7edf\u4f1a\u6839\u636e\u8be5\u76ee\u5f55\u6765\u67e5\u627e\u6587\u4ef6\u3002\u5982\u679c\u8def\u5f84\u6ca1\u6709\u6307\u5b9a&#xff0c;fopen \u4f1a\u4f7f\u7528\u8fdb\u7a0b\u7684\u5f53\u524d\u5de5\u4f5c\u8def\u5f84\u3002<\/p>\n<\/li>\n<li>\n<h4>2.2 \u6587\u4ef6\u7684\u8bfb\u53d6\u4e0e\u5199\u5165\u64cd\u4f5c<\/h4>\n<ul>\n<li>\n<p>fwrite \u7528\u4e8e\u5411\u6587\u4ef6\u5199\u5165\u6570\u636e\u3002\u5176\u51fd\u6570\u58f0\u660e\u4e3a&#xff1a;<\/p>\n<p> <span class=\"token class-name\">size_t<\/span> <span class=\"token function\">fwrite<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">const<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token operator\">*<\/span>ptr<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">size_t<\/span> size<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">size_t<\/span> nmemb<span class=\"token punctuation\">,<\/span> FILE <span class=\"token operator\">*<\/span>stream<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<ul>\n<li>ptr: \u6307\u5411\u8981\u5199\u5165\u6570\u636e\u7684\u6307\u9488\u3002<\/li>\n<li>size: \u6bcf\u4e2a\u5199\u5165\u5bf9\u8c61\u7684\u5927\u5c0f\u3002<\/li>\n<li>nmemb: \u8981\u5199\u5165\u7684\u5bf9\u8c61\u4e2a\u6570\u3002<\/li>\n<li>stream:\u6587\u4ef6\u6d41\u6307\u9488<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>\u4e3e\u4f8b\u4f7f\u7528&#xff1a;<\/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    FILE <span class=\"token operator\">*<\/span>fp <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">fopen<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;log.txt&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;w&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>fp <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;fopen&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> errno<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span> str <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;Hello Linux!&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">fwrite<\/span><span class=\"token punctuation\">(<\/span>str<span class=\"token punctuation\">,<\/span> <span class=\"token function\">strlen<\/span><span class=\"token punctuation\">(<\/span>str<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> fp<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">fclose<\/span><span class=\"token punctuation\">(<\/span>fp<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<ul>\n<li>\n<p>fwrite\u7684\u7b2c\u4e8c\u4e2a\u53c2\u6570\u662f\u6307\u6bcf\u4e2a\u5199\u5165\u5bf9\u8c61\u7684\u5927\u5c0f&#xff0c;strlen\u51fd\u6570\u8fd4\u56de\u7684\u503c\u662f\u4e0d\u5305\u542b\u5b57\u7b26\u4e32\u7ed3\u675f\u6807\u8bc6\u7b26&#xff0c;\u90a3\u4e48\u6211\u4eec\u4f20\u53c2\u662f\u52a0\u4e00\u8fd8\u662f\u4e0d\u52a0\u4e00\u5462&#xff1f;\u52a0\u4e00\u5c31\u4ee3\u8868\u628a\\\\0\u5199\u5165\u5230\u6587\u4ef6\u4e2d&#xff0c;\u90a3\u4e48\u6211\u4eec\u662f\u5e94\u8be5\u600e\u4e48\u9009\u62e9\u5462&#xff1f;\u8fd9\u91cc\u4e0d\u59a8\u8bd5\u4e00\u8bd5\u52a0\u4e00\u7684\u7ed3\u679c&#xff1a;<\/p>\n<p>\u6ce8\u610f log.txt \u6587\u4ef6\u4e2d&#xff0c;\u5b57\u7b26\u4e32\u7684\u672b\u5c3e\u6709\u4e00\u4e2a^&#064;&#xff0c;\u662f\u4ec0\u4e48\u610f\u601d\u5462&#xff1f;\u5b9e\u9645\u4e0a\u8fd9\u4e2a\u5b57\u7b26\u7ec4\u5408\u662f\u8868\u793a\\\\0\u7684ASCII\u7801&#xff0c;\u6240\u4ee5\u5199\u5165\u5b57\u7b26\u4e32\u65f6&#xff0c;\u4f7f\u7528 strlen \u8ba1\u7b97\u5b57\u7b26\u4e32\u957f\u5ea6\u65f6&#xff0c;\u4e0d\u5305\u62ec\u7ed3\u675f\u7b26 \\\\0\u3002\u901a\u5e38\u4e0d\u9700\u8981\u5c06 \\\\0 \u5199\u5165\u6587\u4ef6&#xff0c;\u56e0\u4e3a\u5b83\u662f C \u8bed\u8a00\u4e2d\u7684\u7ed3\u675f\u6807\u5fd7&#xff0c;\u800c\u5728\u5176\u5b83\u8bed\u8a00\u4e2d\u8bfb\u53d6\u6587\u4ef6\u65f6&#xff0c;\u53ef\u80fd\u4e0d\u5e0c\u671b\u770b\u5230\u8fd9\u4e9b\u65e0\u5173\u7684\u5b57\u7b26\u3002<\/p>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h4>2.3 \u4e09\u4e2a\u6807\u51c6\u8f93\u5165\u8f93\u51fa\u6d41<\/h4>\n<p>C \u7a0b\u5e8f\u542f\u52a8\u65f6&#xff0c;\u4f1a\u81ea\u52a8\u6253\u5f00\u4ee5\u4e0b\u4e09\u4e2a\u6807\u51c6\u6d41&#xff1a;<\/p>\n<ul>\n<li>stdin: \u6807\u51c6\u8f93\u5165\u6d41&#xff08;\u901a\u5e38\u4e0e\u952e\u76d8\u8fde\u63a5&#xff09;\u3002<\/li>\n<li>stdout: \u6807\u51c6\u8f93\u51fa\u6d41&#xff08;\u901a\u5e38\u4e0e\u663e\u793a\u5668\u8fde\u63a5&#xff09;\u3002<\/li>\n<li>stderr: \u6807\u51c6\u9519\u8bef\u6d41&#xff08;\u901a\u5e38\u4e0e\u663e\u793a\u5668\u8fde\u63a5&#xff09;\u3002<\/li>\n<\/ul>\n<p>\u8fd9\u4e09\u4e2a\u6d41\u90fd\u7531\u64cd\u4f5c\u7cfb\u7edf\u548c C \u6807\u51c6\u5e93\u63d0\u4f9b&#xff0c;\u5e76\u7528\u4e8e\u5904\u7406\u7a0b\u5e8f\u4e0e\u5916\u90e8\u4ea4\u4e92\u7684\u57fa\u672c\u8f93\u5165\u8f93\u51fa\u3002<\/p>\n<\/li>\n<\/ul>\n<h3>\u4e09\u3001\u8fc7\u6e21\u5230\u7cfb\u7edf&#xff0c;\u8ba4\u8bc6\u6587\u4ef6\u7cfb\u7edf\u8c03\u7528<\/h3>\n<p>\u6587\u4ef6\u5176\u5b9e\u662f\u5728\u78c1\u76d8\u4e0a\u7684&#xff0c;\u78c1\u76d8\u662f\u5916\u90e8\u8bbe\u5907&#xff0c;\u8bbf\u95ee\u78c1\u76d8\u6587\u4ef6\u5176\u5b9e\u662f\u8bbf\u95ee\u786c\u4ef6&#xff01;\u51e0\u4e4e\u6240\u6709\u7684\u5e93\u53ea\u8981\u662f\u8bbf\u95ee\u786c\u4ef6\u8bbe\u5907&#xff0c;\u5fc5\u5b9a\u8981\u5c01\u88c5\u7cfb\u7edf\u8c03\u7528\u3002<\/p>\n<h4>3.1 open \u7cfb\u7edf\u8c03\u7528<\/h4>\n<p>open \u662f\u4e00\u4e2a\u7528\u4e8e\u6253\u5f00\u6587\u4ef6\u6216\u521b\u5efa\u6587\u4ef6\u7684\u7cfb\u7edf\u8c03\u7528&#xff0c;\u5176\u539f\u578b\u4e3a&#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;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> <span class=\"token class-name\">mode_t<\/span> mode<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<ul>\n<li>\u53c2\u6570\u8bf4\u660e&#xff1a;\n<ul>\n<li>pathname: \u6587\u4ef6\u8def\u5f84\u3002<\/li>\n<li>flags: \u6253\u5f00\u6587\u4ef6\u65f6\u7684\u6807\u5fd7&#xff0c;\u4f8b\u5982&#xff1a;\n<ul>\n<li>O_RDONLY&#xff1a;\u53ea\u8bfb\u6253\u5f00\u3002<\/li>\n<li>O_WRONLY&#xff1a;\u53ea\u5199\u6253\u5f00\u3002<\/li>\n<li>O_RDWR&#xff1a;\u8bfb\u5199\u6253\u5f00\u3002<\/li>\n<li>O_CREAT&#xff1a;\u6587\u4ef6\u4e0d\u5b58\u5728\u65f6\u521b\u5efa\u6587\u4ef6\u3002<\/li>\n<li>O_TRUNC&#xff1a;\u6253\u5f00\u6587\u4ef6\u65f6\u6e05\u7a7a\u6587\u4ef6\u5185\u5bb9\u3002<\/li>\n<li>O_APPEND&#xff1a;\u4ee5\u8ffd\u52a0\u6a21\u5f0f\u6253\u5f00\u6587\u4ef6\u3002<\/li>\n<\/ul>\n<\/li>\n<li>mode: \u5728\u4f7f\u7528 O_CREAT \u65f6&#xff0c;\u9700\u8981\u6307\u5b9a\u65b0\u6587\u4ef6\u7684\u8bbf\u95ee\u6743\u9650\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\u8fd4\u56de\u503c&#xff1a;\u6210\u529f\u8fd4\u56de\u6587\u4ef6\u63cf\u8ff0\u7b26&#xff0c;\u5931\u8d25\u8fd4\u56de -1\u3002<\/li>\n<\/ul>\n<h5>1. \u6bd4\u7279\u4f4d\u6807\u5fd7\u4f4d\u793a\u4f8b<\/h5>\n<p>\u901a\u8fc7\u6309\u4f4d\u6216&#xff08;|&#xff09;\u4f20\u9012\u591a\u4e2a\u6807\u5fd7\u4f4d&#xff0c;\u53ef\u4ee5\u5728\u540c\u4e00\u6b21\u8c03\u7528\u4e2d\u540c\u65f6\u6307\u5b9a\u591a\u4e2a\u9009\u9879\u3002<\/p>\n<p>\u4ee3\u7801\u793a\u4f8b&#xff1a;<\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name\">ONE<\/span> <span class=\"token expression\"><span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token operator\">&lt;&lt;<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <\/span><span class=\"token comment\">\/\/ 1<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name\">TWO<\/span> <span class=\"token expression\"><span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token operator\">&lt;&lt;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span> <\/span><span class=\"token comment\">\/\/ 2<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name\">FOUR<\/span> <span class=\"token expression\"><span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token operator\">&lt;&lt;<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span> <\/span><span class=\"token comment\">\/\/ 4<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name\">EIGHT<\/span> <span class=\"token expression\"><span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token operator\">&lt;&lt;<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">)<\/span> <\/span><span class=\"token comment\">\/\/ 8<\/span><\/span><\/p>\n<p><span class=\"token keyword\">void<\/span> <span class=\"token function\">show<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> flags<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>flags <span class=\"token operator\">&amp;<\/span> ONE<span class=\"token punctuation\">)<\/span> <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;function1\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>flags <span class=\"token operator\">&amp;<\/span> TWO<span class=\"token punctuation\">)<\/span> <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;function2\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>flags <span class=\"token operator\">&amp;<\/span> FOUR<span class=\"token punctuation\">)<\/span> <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;function3\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>flags <span class=\"token operator\">&amp;<\/span> EIGHT<span class=\"token punctuation\">)<\/span> <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;function4\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">return<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/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\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8211;\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">show<\/span><span class=\"token punctuation\">(<\/span>ONE<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8211;\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">show<\/span><span class=\"token punctuation\">(<\/span>ONE <span class=\"token operator\">|<\/span> TWO<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8211;\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">show<\/span><span class=\"token punctuation\">(<\/span>ONE <span class=\"token operator\">|<\/span> TWO <span class=\"token operator\">|<\/span> FOUR <span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8211;\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">show<\/span><span class=\"token punctuation\">(<\/span>ONE <span class=\"token operator\">|<\/span> TWO <span class=\"token operator\">|<\/span> FOUR <span class=\"token operator\">|<\/span> EIGHT<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8211;\\\\n&#034;<\/span><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>\u8f93\u51fa\u793a\u4f8b&#xff1a;<\/p>\n<h4>3.2 write \u7cfb\u7edf\u8c03\u7528<\/h4>\n<p>write \u7528\u4e8e\u5c06\u6570\u636e\u5199\u5165\u6587\u4ef6&#xff0c;\u5176\u539f\u578b\u4e3a&#xff1a;<\/p>\n<p><span class=\"token class-name\">ssize_t<\/span> <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> <span class=\"token class-name\">size_t<\/span> count<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<ul>\n<li>\u53c2\u6570\u8bf4\u660e&#xff1a;\n<ul>\n<li>fd: \u6587\u4ef6\u63cf\u8ff0\u7b26\u3002<\/li>\n<li>buf: \u6307\u5411\u6570\u636e\u7f13\u51b2\u533a\u7684\u6307\u9488\u3002<\/li>\n<li>count: \u8981\u5199\u5165\u7684\u6570\u636e\u5b57\u8282\u6570\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\u8fd4\u56de\u503c&#xff1a;\u5b9e\u9645\u5199\u5165\u7684\u5b57\u8282\u6570\u3002<\/li>\n<\/ul>\n<h5>1. \u6a21\u62df\u5b9e\u73b0 w \u9009\u9879<\/h5>\n<p>\u6a21\u62df fopen \u7684 w \u6a21\u5f0f&#xff08;\u6e05\u7a7a\u6587\u4ef6\u540e\u5199\u5165&#xff09;&#xff1a;<\/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\">umask<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u5c06\u6743\u9650\u63a9\u7801\u8bbe\u7f6e\u62100000<\/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;log.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        <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;open file error\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><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> str <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;bbb&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">ssize_t<\/span> ret <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">write<\/span><span class=\"token punctuation\">(<\/span>fd<span class=\"token punctuation\">,<\/span> str<span class=\"token punctuation\">,<\/span> <span class=\"token function\">strlen<\/span><span class=\"token punctuation\">(<\/span>str<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>fd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <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<h5>2. \u6a21\u62df\u5b9e\u73b0 a \u9009\u9879<\/h5>\n<p>\u6a21\u62df fopen \u7684 a \u6a21\u5f0f&#xff08;\u8ffd\u52a0\u5199&#xff09;&#xff1a;<\/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\">umask<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><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;log.txt&#034;<\/span><span class=\"token punctuation\">,<\/span> O_WRONLY <span class=\"token operator\">|<\/span> O_CREAT <span class=\"token operator\">|<\/span> O_APPEND<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        <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;open file error\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> errno<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> str <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;bbb&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">ssize_t<\/span> ret <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">write<\/span><span class=\"token punctuation\">(<\/span>fd<span class=\"token punctuation\">,<\/span> str<span class=\"token punctuation\">,<\/span> <span class=\"token function\">strlen<\/span><span class=\"token punctuation\">(<\/span>str<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token function\">close<\/span><span class=\"token punctuation\">(<\/span>fd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <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<h4>3.3 read \u7cfb\u7edf\u8c03\u7528<\/h4>\n<p>read \u7528\u4e8e\u4ece\u6587\u4ef6\u4e2d\u8bfb\u53d6\u6570\u636e&#xff0c;\u5176\u539f\u578b\u4e3a&#xff1a;<\/p>\n<p><span class=\"token class-name\">ssize_t<\/span> <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> <span class=\"token class-name\">size_t<\/span> count<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<ul>\n<li>\u53c2\u6570\u8bf4\u660e&#xff1a;\n<ul>\n<li>fd: \u6587\u4ef6\u63cf\u8ff0\u7b26\u3002<\/li>\n<li>buf: \u5b58\u50a8\u8bfb\u53d6\u6570\u636e\u7684\u7f13\u51b2\u533a\u3002<\/li>\n<li>count: \u7f13\u51b2\u533a\u7684\u5927\u5c0f\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\u8fd4\u56de\u503c&#xff1a;\u5b9e\u9645\u8bfb\u53d6\u7684\u5b57\u8282\u6570\u3002<\/li>\n<\/ul>\n<h3>\u56db\u3001\u8bbf\u95ee\u6587\u4ef6\u7684\u672c\u8d28<\/h3>\n<li>struct file \u7ed3\u6784\u4f53\u7684\u4f5c\u7528<\/li>\n<ul>\n<li>\u5f53\u6587\u4ef6\u88ab\u6253\u5f00\u65f6&#xff0c;\u64cd\u4f5c\u7cfb\u7edf\u4e3a\u8be5\u6587\u4ef6\u521b\u5efa\u4e00\u4e2a struct file \u7ed3\u6784\u4f53\u5bf9\u8c61&#xff0c;\u8d1f\u8d23\u7ba1\u7406\u8be5\u6587\u4ef6\u7684\u5143\u6570\u636e\u548c\u8bbf\u95ee\u4fe1\u606f\u3002<\/li>\n<li>\u64cd\u4f5c\u7cfb\u7edf\u5bf9\u6587\u4ef6\u7684\u7ba1\u7406\u672c\u8d28\u4e0a\u5c31\u662f\u5bf9\u8fd9\u4e9b struct file \u7ed3\u6784\u4f53\u5bf9\u8c61\u7684\u7ba1\u7406&#xff0c;\u5b83\u4eec\u88ab\u7ec4\u7ec7\u6210\u4e00\u4e2a\u53cc\u94fe\u8868&#xff0c;\u4fdd\u5b58\u6240\u6709\u5f53\u524d\u6253\u5f00\u7684\u6587\u4ef6\u3002<\/li>\n<\/ul>\n<li>\u6587\u4ef6\u63cf\u8ff0\u7b26\u8868&#xff08;files_struct&#xff09;<\/li>\n<ul>\n<li>\u6bcf\u4e2a\u8fdb\u7a0b\u90fd\u6709\u4e00\u4e2a struct files_struct \u7c7b\u578b\u7684\u5bf9\u8c61&#xff0c;\u5b83\u8bb0\u5f55\u4e86\u8be5\u8fdb\u7a0b\u6240\u6253\u5f00\u7684\u6240\u6709\u6587\u4ef6\u7684\u4fe1\u606f\u3002<\/li>\n<li>struct files_struct \u4e2d\u6709\u4e00\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\u8868&#xff0c;\u7ef4\u62a4\u4e86\u4e00\u4e2a struct file* \u7c7b\u578b\u7684\u6570\u7ec4\u3002\u6570\u7ec4\u7684\u4e0b\u6807\u5c31\u662f\u6587\u4ef6\u63cf\u8ff0\u7b26&#xff0c;\u6307\u5411\u8fdb\u7a0b\u6253\u5f00\u7684\u6587\u4ef6\u7684 struct file \u7ed3\u6784\u4f53\u5bf9\u8c61\u3002<\/li>\n<\/ul>\n<li>\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u5206\u914d\u89c4\u5219<\/li>\n<ul>\n<li>\u64cd\u4f5c\u7cfb\u7edf\u4f1a\u4e3a\u8fdb\u7a0b\u6253\u5f00\u7684\u65b0\u6587\u4ef6\u5206\u914d\u4e00\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26&#xff0c;\u5206\u914d\u4ece 3 \u5f00\u59cb&#xff08;\u56e0\u4e3a\u6807\u51c6\u8f93\u5165\u3001\u8f93\u51fa\u3001\u9519\u8bef\u6d41\u5360\u7528\u6587\u4ef6\u63cf\u8ff0\u7b26 0\u30011\u30012&#xff09;\u3002<\/li>\n<li>\u65b0\u6253\u5f00\u7684\u6587\u4ef6\u5c06\u4ece\u8fdb\u7a0b\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u8868\u4e2d\u627e\u5230\u6700\u5c0f\u7684\u672a\u4f7f\u7528\u4e0b\u6807&#xff0c;\u4f5c\u4e3a\u6587\u4ef6\u63cf\u8ff0\u7b26\u3002<\/li>\n<\/ul>\n<li>FILE \u7c7b\u578b\u5728 C \u8bed\u8a00\u4e2d\u7684\u4f5c\u7528<\/li>\n<ul>\n<li>\n<p>FILE \u662f C \u8bed\u8a00\u5e93\u4e2d\u7684\u5c01\u88c5\u7c7b\u578b&#xff0c;\u7528\u4e8e\u63cf\u8ff0\u6587\u4ef6&#xff0c;\u5b83\u63d0\u4f9b\u4e86\u66f4\u9ad8\u5c42\u6b21\u7684\u6587\u4ef6\u64cd\u4f5c\u63a5\u53e3\u3002<\/p>\n<\/li>\n<li>\n<p>FILE \u7c7b\u578b\u5185\u90e8\u5c01\u88c5\u4e86\u6587\u4ef6\u63cf\u8ff0\u7b26&#xff0c;_fileno \u5b57\u6bb5\u5c31\u662f\u5bf9\u5e94\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26&#xff0c;\u53ef\u4ee5\u901a\u8fc7\u5b83\u6765\u8bbf\u95ee\u5e95\u5c42\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u3002<\/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\">umask<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><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;log1.txt&#034;<\/span><span class=\"token punctuation\">,<\/span> O_WRONLY <span class=\"token operator\">|<\/span> O_CREAT <span class=\"token operator\">|<\/span> O_APPEND<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\">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;log2.txt&#034;<\/span><span class=\"token punctuation\">,<\/span> O_WRONLY <span class=\"token operator\">|<\/span> O_CREAT <span class=\"token operator\">|<\/span> O_APPEND<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\">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;log3.txt&#034;<\/span><span class=\"token punctuation\">,<\/span> O_WRONLY <span class=\"token operator\">|<\/span> O_CREAT <span class=\"token operator\">|<\/span> O_APPEND<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\">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;log4.txt&#034;<\/span><span class=\"token punctuation\">,<\/span> O_WRONLY <span class=\"token operator\">|<\/span> O_CREAT <span class=\"token operator\">|<\/span> O_APPEND<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 function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;fd1: %d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> fd1<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;fd2: %d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> fd2<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;fd3: %d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> fd3<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;fd4: %d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> fd4<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span>\n <\/li>\n<\/ul>\n<li>\u6587\u4ef6\u7684\u5f15\u7528\u8ba1\u6570\u4e0e\u5173\u95ed<\/li>\n<ul>\n<li>\u6587\u4ef6\u53ef\u4ee5\u88ab\u591a\u4e2a\u8fdb\u7a0b\u540c\u65f6\u6253\u5f00&#xff0c;struct file \u4e2d\u6709\u4e00\u4e2a f_count \u5b57\u6bb5\u6765\u8bb0\u5f55\u6587\u4ef6\u7684\u5f15\u7528\u8ba1\u6570\u3002<\/li>\n<li>\u5f53\u8fdb\u7a0b\u5173\u95ed\u6587\u4ef6\u65f6&#xff0c;close \u7cfb\u7edf\u8c03\u7528\u4f1a\u5c06\u6587\u4ef6\u63cf\u8ff0\u7b26\u8868\u4e2d\u5bf9\u5e94\u4f4d\u7f6e\u7684\u5185\u5bb9\u7f6e\u4e3a NULL&#xff0c;\u51cf\u5c11\u6587\u4ef6\u7684\u5f15\u7528\u8ba1\u6570\u3002\u5982\u679c\u5f15\u7528\u8ba1\u6570\u4e3a 0&#xff0c;\u64cd\u4f5c\u7cfb\u7edf\u4f1a\u56de\u6536\u8be5\u6587\u4ef6\u5bf9\u5e94\u7684\u8d44\u6e90\u3002<\/li>\n<\/ul>\n<li>\u6807\u51c6\u8f93\u5165\u3001\u8f93\u51fa\u548c\u9519\u8bef\u6d41&#xff08;\u6587\u4ef6\u63cf\u8ff0\u7b26 0, 1, 2&#xff09;<\/li>\n<ul>\n<li>\n<p>\u64cd\u4f5c\u7cfb\u7edf\u4f1a\u5728\u7a0b\u5e8f\u542f\u52a8\u65f6\u81ea\u52a8\u6253\u5f00\u6807\u51c6\u8f93\u5165&#xff08;\u6587\u4ef6\u63cf\u8ff0\u7b26 0&#xff09;\u3001\u6807\u51c6\u8f93\u51fa&#xff08;\u6587\u4ef6\u63cf\u8ff0\u7b26 1&#xff09;\u548c\u6807\u51c6\u9519\u8bef&#xff08;\u6587\u4ef6\u63cf\u8ff0\u7b26 2&#xff09;\u3002<\/p>\n<\/li>\n<li>\n<p>\u8fd9\u4e09\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\u662f\u9884\u7559\u7684&#xff0c;\u7a0b\u5e8f\u4e2d\u6253\u5f00\u7684\u65b0\u6587\u4ef6\u4f1a\u4ece\u6587\u4ef6\u63cf\u8ff0\u7b26 3 \u5f00\u59cb\u3002<\/p>\n<\/li>\n<\/ul>\n<li>\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u5173\u95ed\u4e0e\u8f93\u51fa<\/li>\n<ul>\n<li>\n<p>\u901a\u8fc7 close \u7cfb\u7edf\u8c03\u7528\u5173\u95ed\u6587\u4ef6\u63cf\u8ff0\u7b26\u540e&#xff0c;\u8fdb\u7a0b\u65e0\u6cd5\u518d\u901a\u8fc7\u8be5\u6587\u4ef6\u63cf\u8ff0\u7b26\u8fdb\u884c\u6587\u4ef6\u64cd\u4f5c\u3002\u4f8b\u5982&#xff0c;\u5173\u95ed\u6807\u51c6\u8f93\u51fa&#xff08;close(1)&#xff09;\u4f1a\u5bfc\u81f4\u540e\u7eed\u7684 printf \u8f93\u51fa\u65e0\u6cd5\u663e\u793a&#xff0c;\u4f46\u5176\u4ed6\u6d41\u5982\u6807\u51c6\u9519\u8bef\u4ecd\u7136\u6709\u6548\u3002<\/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\">\/\/ \u5c06 stdout \u5173\u95ed<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> ret <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;stdin-&gt;fd: %d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token constant\">stdin<\/span><span class=\"token operator\">-&gt;<\/span>_fileno<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;stdout-&gt;fd: %d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token constant\">stdout<\/span><span class=\"token operator\">-&gt;<\/span>_fileno<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;stderr-&gt;fd: %d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token constant\">stderr<\/span><span class=\"token operator\">-&gt;<\/span>_fileno<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token function\">fprintf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token constant\">stderr<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;printf ret: %d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> ret<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>\n <\/li>\n<\/ul>\n<hr \/>\n<h2>\u7ed3\u8bed<\/h2>\n<p>IO \u64cd\u4f5c\u662f\u64cd\u4f5c\u7cfb\u7edf\u7684 \u201c\u8840\u8109\u201d&#xff0c;\u7406\u89e3\u5176\u5e95\u5c42\u539f\u7406\u4e0d\u4ec5\u80fd\u5e2e\u52a9\u6211\u4eec\u5199\u51fa\u66f4\u5065\u58ee\u7684\u4ee3\u7801&#xff0c;\u8fd8\u80fd\u4e3a\u6df1\u5165\u5b66\u4e60\u8fdb\u7a0b\u901a\u4fe1\u3001\u7f51\u7edc\u7f16\u7a0b\u7b49\u9ad8\u7ea7\u4e3b\u9898\u5960\u5b9a\u57fa\u7840\u3002\u5e0c\u671b\u672c\u6587\u80fd\u6210\u4e3a\u4f60\u63a2\u7d22 Linux \u7cfb\u7edf\u7f16\u7a0b\u7684\u4e00\u5757\u57fa\u77f3&#xff0c;\u5728\u540e\u7eed\u7684\u5b66\u4e60\u4e2d&#xff0c;\u4f60\u53ef\u4ee5\u5c1d\u8bd5\u7ed3\u5408\u5b9e\u9645\u9879\u76ee&#xff0c;\u5bf9\u6bd4\u4e0d\u540c IO 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