{"id":38104,"date":"2025-05-19T14:14:08","date_gmt":"2025-05-19T06:14:08","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/38104.html"},"modified":"2025-05-19T14:14:08","modified_gmt":"2025-05-19T06:14:08","slug":"%e6%b7%b1%e5%85%a5%e4%ba%86%e8%a7%a3linux%e7%b3%bb%e7%bb%9f-%e5%9f%ba%e7%a1%80io%ef%bc%88%e4%b8%8a%ef%bc%89","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/38104.html","title":{"rendered":"\u6df1\u5165\u4e86\u89e3linux\u7cfb\u7edf\u2014\u2014 \u57fa\u7840IO\uff08\u4e0a\uff09"},"content":{"rendered":"<h2>\u6587\u4ef6<\/h2>\n<p>\u5728\u4e4b\u524d\u5b66\u4e60C\u8bed\u8a00\u6587\u4ef6\u64cd\u4f5c\u65f6&#xff0c;\u6211\u4eec\u4e86\u89e3\u8fc7\u4ec0\u4e48\u662f\u6587\u4ef6&#xff0c;\u8fd9\u91cc\u7b80\u5355\u56de\u987e\u4e00\u4e0b&#xff1a;<\/p>\n<p>\u6587\u4ef6\u5b58\u5728\u78c1\u76d8\u4e2d&#xff0c;\u6587\u4ef6\u6709\u5206\u4e3a\u7a0b\u5e8f\u6587\u4ef6\u3001\u6570\u636e\u6587\u4ef6&#xff1b;\u4e8c\u8fdb\u5236\u6587\u4ef6\u548c\u6587\u672c\u6587\u4ef6\u7b49\u3002<\/p>\n<p>\u8be6\u7ec6\u63cf\u8ff0\u89c1\u6587\u7ae0&#xff1a;\u6587\u4ef6\u64cd\u4f5c\u2014\u2014C\u8bed\u8a00<\/p>\n<ul>\n<li>\u6587\u4ef6\u5728\u78c1\u76d8\u91cc&#xff0c;\u78c1\u76d8\u662f\u6c38\u4e45\u6027\u5b58\u50a8\u4ecb\u8d28&#xff0c;\u56e0\u4e3a\u6587\u4ef6\u5728\u78c1\u76d8\u4e0a\u7684\u5b58\u50a8\u662f\u6c38\u4e45\u6027\u7684&#xff1b;<\/li>\n<li>\u78c1\u76d8\u662f\u5916\u8bbe&#xff08;\u662f\u8f93\u5165\u8bbe\u5907\u4e5f\u662f\u8f93\u51fa\u8bbe\u5907&#xff09;&#xff1b;<\/li>\n<li>\u672c\u8d28\u4e0a\u5bf9\u78c1\u76d8\u662f\u6587\u4ef6\u7684\u6240\u6709\u64cd\u4f5c&#xff0c;\u90fd\u662f\u5bf9\u5916\u8bbe\u7684\u8f93\u5165\u548c\u8f93\u51fa&#xff1b;\u4e5f\u5c31\u662fI\/O\u3002<\/li>\n<\/ul>\n<p>\u5bf9\u4e8e\u6587\u4ef6\u7684\u8ba4\u8bc6&#xff1a;<\/p>\n<ul>\n<li>\u6587\u4ef6 &#061; \u6587\u4ef6\u5185\u5bb9 &#043; \u6587\u4ef6\u5c5e\u6027<\/li>\n<li>\u6587\u4ef6\u5927\u5c0f\u662f0KB\u7684\u6587\u4ef6\u4e5f\u662f\u5360\u7528\u78c1\u76d8\u7a7a\u95f4\u7684<\/li>\n<li>\u6240\u6709\u5bf9\u4e8e\u6587\u4ef6\u7684\u76f8\u5173\u64cd\u4f5c\u90fd\u662f\u5bf9\u6587\u4ef6\u5185\u5bb9\u548c\u6587\u4ef6\u5c5e\u6027\u5c31\u884c\u64cd\u4f5c\u3002<\/li>\n<\/ul>\n<p>\u5728\u7cfb\u7edf\u5c42\u9762\u7406\u89e3<\/p>\n<ul>\n<li>\u6211\u4eec\u64cd\u4f5c\u6587\u4ef6&#xff08;\u6253\u5f00&#xff0c;\u5173\u95ed\u6587\u4ef6&#xff09;&#xff0c;\u672c\u8d28\u4e0a\u662f\u8fdb\u7a0b\u5bf9\u4e8e\u6587\u4ef6\u7684\u64cd\u4f5c&#xff1b;<\/li>\n<li>\u78c1\u76d8\u7684\u7ba1\u7406\u8005\u662f\u64cd\u4f5c\u7cfb\u7edf&#xff1b;<\/li>\n<li>\u6211\u4eec\u5728C\/C&#043;&#043;\u4f7f\u7528\u5e93\u51fd\u6570\u6765\u5bf9\u6587\u4ef6\u8fdb\u884c\u8bfb\u5199\u64cd\u4f5c&#xff0c;\u672c\u8d28\u4e0a\u662f\u901a\u8fc7\u6587\u4ef6\u76f8\u5173\u7684\u7cfb\u7edf\u8c03\u7528\u53bb\u5b8c\u6210\u7684\u3002<\/li>\n<\/ul>\n<h2>C\u6587\u4ef6\u64cd\u4f5c<\/h2>\n<h3>\u6253\u5f00\u548c\u5173\u95ed\u6587\u4ef6<\/h3>\n<p>\u5728C\u8bed\u8a00\u5f53\u4e2d&#xff0c;\u6211\u4eec\u901a\u8fc7fopen\u6765\u6253\u5f00\u6587\u4ef6&#xff0c;fclose\u6765\u5173\u95ed\u6587\u4ef6&#xff1b;<\/p>\n<li>fopen&#xff1a;\u6253\u5f00\u6587\u4ef6&#xff0c;\u5982\u679c\u6253\u5f00\u6210\u529f\u8fd4\u56de\u4e00\u4e2aFILE*\u7c7b\u578b\u7684\u6307\u9488&#xff0c;\u6267\u884c\u88ab\u6253\u5f00\u7684\u6587\u4ef6&#xff1b;\u6253\u5f00\u5931\u8d25\u5219\u8fd4\u56deNULL&#xff1b;<\/li>\n<li>fclose&#xff1a;\u5173\u95ed\u6587\u4ef6&#xff0c;\u4f20\u53c2FILE*\u7c7b\u578b\u7684\u6307\u9488&#xff0c;\u5173\u95ed\u6307\u5b9a\u6587\u4ef6\u3002<\/li>\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;stdio.h&gt;<\/span><\/span><br \/>\n<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><span class=\"token comment\">\/\/\u4ee5\u8bfb\u65b9\u5f0f\u6253\u5f00&#xff0c;\u6587\u4ef6\u4e0d\u5b58\u5728\u5c31\u65b0\u5efa      <\/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><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> <span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token comment\">\/\/&#8230;.      <\/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><span class=\"token comment\">\/\/\u5173\u95ed\u6587\u4ef6                                                              <\/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<h3>\u6253\u5f00\u6587\u4ef6\u7684\u65b9\u5f0f<\/h3>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/05\/20250519061402-682acc2a76073.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>\u6211\u4eec\u77e5\u9053\u5728C\u8bed\u8a00\u7684fopen\u63a5\u53e3\u6253\u5f00\u6587\u4ef6\u662f\u6709\u5f88\u591a\u6253\u5f00\u65b9\u5f0f<\/p>\n<p>r&#xff1a;\u4ee5\u8bfb\u65b9\u5f0f\u6253\u5f00\u3001w\u4ee5\u5199\u65b9\u5f0f\u6253\u5f00\u3001a\u4ee5\u8ffd\u52a0\u65b9\u5f0f\u6253\u5f00\u3002<\/p>\n<p>r\u65b9\u5f0f&#xff0c;\u5f53\u6587\u4ef6\u4e0d\u5b58\u5728\u65f6\u5c31\u6253\u5f00\u6587\u4ef6\u5931\u8d25&#xff1b;<\/p>\n<p>w\u65b9\u5f0f&#xff0c;\u5f53\u6587\u4ef6\u4e0d\u5b58\u5728\u65f6\u5c31\u65b0\u5efa\u6587\u4ef6&#xff08;\u5728\u5f53\u524d\u5de5\u4f5c\u8def\u5f84\u4e0b\u521b\u5efa&#xff0c;\u8fdb\u7a0b\u5f53\u4e2d\u5b58\u653e\u4e86\u5f53\u524d\u5de5\u4f5c\u8def\u5f84&#xff09;&#xff1b;\u5982\u679c\u6587\u4ef6\u5b58\u5728\u4f1a\u6e05\u7a7a\u5f53\u524d\u6587\u4ef6\u7684\u5185\u5bb9&#xff1b;\u7136\u540e\u5728\u8fdb\u5165\u5199\u5165\u3002<\/p>\n<p>a\u65b9\u5f0f&#xff0c;\u8ffd\u52a0&#xff0c;\u5f53\u6587\u4ef6\u4e0d\u5b58\u5728\u5c31\u65b0\u5efa\u6587\u4ef6&#xff1b;\u5982\u679c\u6587\u4ef6\u5df2\u7ecf\u5b58\u5728&#xff0c;\u6253\u5f00\u65f6\u4e0d\u4f1a\u6e05\u7a7a\u6587\u4ef6\u5185\u5bb9&#xff0c;\u800c\u662f\u5728\u6587\u4ef6\u672b\u5c3e\u8fdb\u884c\u5199\u5165<\/p>\n<h3>\u5199\u6587\u4ef6<\/h3>\n<p>\u5f53\u6211\u4eec\u4ee5w\/r\u65b9\u5f0f\u6253\u5f00\u4e00\u4e2a\u6587\u4ef6&#xff0c;\u6211\u4eec\u8981\u5c06\u5185\u5bb9\u5199\u5230\u6587\u4ef6\u5f53\u4e2d&#xff1b;<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/05\/20250519061402-682acc2aec712.png\" alt=\"img\" \/><\/p>\n<p>\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528fputc\u3001fputs\u3001fwrite\u3001fprintf\u8fdb\u884c\u6587\u4ef6\u7684\u5199\u5165&#xff1b;<\/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;stdio.h&gt;<\/span><\/span><br \/>\n<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><span class=\"token comment\">\/\/\u4ee5\u8bfb\u65b9\u5f0f\u6253\u5f00&#xff0c;\u6587\u4ef6\u4e0d\u5b58\u5728\u5c31\u65b0\u5efa      <\/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><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> <span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">for<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">char<\/span> ch <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#039;a&#039;<\/span><span class=\"token punctuation\">;<\/span>ch <span class=\"token operator\">&lt;&#061;<\/span> <span class=\"token string\">&#039;z&#039;<\/span><span class=\"token punctuation\">;<\/span>ch<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">fputc<\/span><span class=\"token punctuation\">(<\/span>ch<span class=\"token punctuation\">,<\/span>fp<span class=\"token punctuation\">)<\/span><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 punctuation\">(<\/span><span class=\"token keyword\">char<\/span><span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span><span class=\"token string\">&#034;I love you\\\\n&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">fputs<\/span><span class=\"token punctuation\">(<\/span>str<span class=\"token punctuation\">,<\/span>fp<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> x <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">100<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">fprintf<\/span><span class=\"token punctuation\">(<\/span>fp<span class=\"token punctuation\">,<\/span><span class=\"token string\">&#034;x &#061; %d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span>x<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><span class=\"token comment\">\/\/\u5173\u95ed\u6587\u4ef6                                                              <\/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\/05\/20250519061403-682acc2b0f421.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h3>\u6587\u4ef6\u8bfb\u53d6<\/h3>\n<p>\u6211\u4eec\u4ee5r\u65b9\u5f0f\u6253\u5f00\u4e00\u4e2a\u6587\u4ef6&#xff0c;\u6211\u4eec\u8981\u50cf\u8bfb\u53d6\u8fd9\u4e2a\u6587\u4ef6\u7684\u5185\u5bb9&#xff0c;\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528fgetc\u3001fgets\u3001fscanf\u8fdb\u5165\u6587\u4ef6\u5185\u5bb9\u7684\u8bfb\u53d6\u64cd\u4f5c&#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;stdio.h&gt;<\/span><\/span><br \/>\n<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><span class=\"token comment\">\/\/\u4ee5\u8bfb\u65b9\u5f0f\u6253\u5f00&#xff0c;\u6587\u4ef6\u4e0d\u5b58\u5728\u5c31\u65b0\u5efa      <\/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><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> <span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">for<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span>i<span class=\"token operator\">&lt;<\/span><span class=\"token number\">26<\/span><span class=\"token punctuation\">;<\/span>i<span class=\"token operator\">&#043;&#043;<\/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;%c&#034;<\/span><span class=\"token punctuation\">,<\/span><span class=\"token function\">fgetc<\/span><span class=\"token punctuation\">(<\/span>fp<span class=\"token punctuation\">)<\/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;\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><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 function\">fgets<\/span><span class=\"token punctuation\">(<\/span>buff<span class=\"token punctuation\">,<\/span><span class=\"token number\">12<\/span><span class=\"token punctuation\">,<\/span>fp<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token comment\">\/\/buff[11] &#061; &#039;\\\\0&#039;;    <\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;%s&#034;<\/span><span class=\"token punctuation\">,<\/span>buff<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> x<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">fscanf<\/span><span class=\"token punctuation\">(<\/span>fp<span class=\"token punctuation\">,<\/span><span class=\"token string\">&#034;x &#061; %d&#034;<\/span><span class=\"token punctuation\">,<\/span><span class=\"token operator\">&amp;<\/span>x<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;x &#061; %d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> x<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><span class=\"token comment\">\/\/\u5173\u95ed\u6587\u4ef6                                                              <\/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\/05\/20250519061403-682acc2b4e3f1.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h3>stdin\/stdout\/stderr<\/h3>\n<p>\u5728\u6211\u4eec\u7a0b\u5e8f\u8fd0\u884c\u65f6&#xff0c;C\u8bed\u8a00\u5b83\u4f1a\u9ed8\u8ba4\u6253\u5f00\u4e09\u4e2a\u6587\u4ef6&#xff1a;stdin\u3001stdout\u548cstderr&#xff1b;<\/p>\n<p>\u6211\u4eec\u53ef\u4ee5\u53d1\u73b0\u8fd9\u4e09\u4e2a\u90fd\u662f\u6587\u4ef6\u7c7b\u578b\u6307\u9488<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/05\/20250519061403-682acc2b61d6f.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h2>\u7cfb\u7edf\u6587\u4ef6I\/O<\/h2>\n<p>\u5728\u4e0a\u8ff0C\u8bed\u8a00\u7684\u6587\u4ef6\u64cd\u4f5cfopen\u3001fclose\u90fd\u662f\u8bed\u8a00\u5c42\u63d0\u4f9b\u7ed9\u6211\u4eec\u7684\u6587\u4ef6\u64cd\u4f5c\u63a5\u53e3&#xff1b;\u4ee5\u53caC\u8bed\u8a00\u7684stdin\u3001stdout\u3001stderr&#xff1b;C&#043;&#043;\u4e2d\u7684cin\u3001cout\u3001cerr\u90fd\u662f\u8bed\u8a00\u5c42\u63d0\u4f9b\u7ed9\u6211\u4eec\u7684\u65b9\u6848&#xff1b;<\/p>\n<p>\u6211\u4eec\u77e5\u9053\u6587\u4ef6\u7684\u7ba1\u7406\u8005\u662f\u64cd\u4f5c\u7cfb\u7edf&#xff0c;\u6240\u4ee5\u6211\u4eec\u5bf9\u6587\u4ef6\u64cd\u4f5c\u90fd\u8981\u7ecf\u8fc7\u64cd\u4f5c\u7cfb\u7edf&#xff1b;<\/p>\n<p>\u90a3\u4e5f\u5c31\u662f\u8bf4\u8bed\u8a00\u5c42\u7684\u6587\u4ef6\u64cd\u4f5c\u63a5\u53e3&#xff0c;\u5176\u5e95\u5c42\u90fd\u5c01\u88c5\u4e86\u7cfb\u7edf\u8c03\u7528\u3002<\/p>\n<h3>1. \u4f20\u9012\u591a\u4e2a\u6807\u5fd7\u4f4d\u7684\u65b9\u6cd5<\/h3>\n<p>\u5728\u4e4b\u524d\u7684\u4e60\u60ef\u4e2d&#xff0c;\u6211\u4eec\u901a\u5e38\u4f7f\u7528\u4e00\u4e2a\u53c2\u6570\u6765\u4f5c\u4e3a\u4e00\u4e2a\u6807\u8bb0\u4f4d&#xff1b;\u8fd9\u6837\u6211\u4eec\u5728\u4f20\u9012\u591a\u4e2a\u6807\u5fd7\u4f4d\u65f6\u5c31\u9700\u8981\u4f20\u9012\u591a\u4e2a\u53c2\u6570\u3002<\/p>\n<p>\u73b0\u5728\u6765\u4e86\u89e3\u4e00\u79cd\u4f7f\u7528\u4e00\u4e2a\u53c2\u6570\u6765\u4f20\u9012\u591a\u4e2a\u6807\u5fd7\u4f4d\u7684\u65b9\u6cd5&#xff1a;<\/p>\n<p>\u4f7f\u7528\u4e00\u4e2abit\u4e3a\u6765\u4f5c\u4e3a\u4e00\u4e2a\u6807\u8bc6\u7b26&#xff0c;\u8fd9\u6837\u4f7f\u7528\u4e00\u4e2a\u53c2\u6570\u5c31\u53ef\u4ee5\u8868\u793a\u591a\u4e2a\u6807\u5fd7\u4f4d\u4e86\u3002<\/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;stdio.h&gt;<\/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\">ONE<\/span> <span class=\"token expression\"><span class=\"token number\">0001<\/span>   <\/span><span class=\"token comment\">\/\/0000 0001<\/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 number\">0002<\/span>   <\/span><span class=\"token comment\">\/\/0000 0010<\/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\">THREE<\/span> <span class=\"token expression\"><span class=\"token number\">0004<\/span> <\/span><span class=\"token comment\">\/\/0000 0100   <\/span><\/span><br \/>\n<span class=\"token keyword\">void<\/span> <span class=\"token function\">func<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> flag<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>flag <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;ONE &#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>flag <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;TWO &#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>flag <span class=\"token operator\">&amp;<\/span> THREE<span class=\"token punctuation\">)<\/span>  <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;THREE &#034;<\/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;\\\\n&#034;<\/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> <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\">func<\/span><span class=\"token punctuation\">(<\/span>ONE<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">func<\/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\">func<\/span><span class=\"token punctuation\">(<\/span>ONE <span class=\"token operator\">|<\/span> THREE<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">func<\/span><span class=\"token punctuation\">(<\/span>ONE <span class=\"token operator\">|<\/span> TWO <span class=\"token operator\">|<\/span> THREE<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\/05\/20250519061403-682acc2b70d69.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>\u8fd9\u6837\u5c31\u53ef\u4ee5\u4f7f\u7528\u4e00\u4e2a\u53c2\u6570&#xff0c;\u4f20\u9012\u591a\u4e2a\u6807\u5fd7\u4f4d\u4e86\u3002<\/p>\n<p>Linux\u64cd\u4f5c\u7cfb\u7edfopen\u63a5\u53e3\u5c31\u4f7f\u7528\u4e86\u4e00\u4e2a\u53c2\u6570\u6765\u4f20\u9012\u591a\u4e2a\u6807\u5fd7\u4f4d\u3002<\/p>\n<h3>2. \u6253\u5f00\u6587\u4ef6open<\/h3>\n<p>\u5728\u8bed\u8a00\u5c42\u9762&#xff0c;\u6211\u4eec\u4f7f\u7528\u7684fopen&#xff0c;\u5b83\u672c\u8d28\u4e0a\u5c31\u662f\u5bf9\u7cfb\u7edf\u8c03\u7528\u7684\u5c01\u88c5&#xff1b;<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/05\/20250519061403-682acc2b7d367.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>\u53ef\u4ee5\u770b\u5230open\u662f\u4e00\u4e2a\u7cfb\u7edf\u8c03\u7528&#xff1b;\u5b83\u7684\u4f5c\u7528\u5c31\u662f\u6253\u5f00\u4e00\u4e2a\u6587\u4ef6&#xff0c;\u4e5f\u53ef\u80fd\u4f1a\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u6587\u4ef6\u3002<\/p>\n<p>\u6211\u4eec\u53ef\u4ee5\u770b\u5230open\u51fd\u6570\u5b83\u5b58\u5728\u4e00\u4e2a\u4e24\u4e2a\u53c2\u6570\u7684&#xff0c;\u4e5f\u5b58\u5728\u4e00\u4e2a\u4e09\u4e2a\u53c2\u6570\u7684&#xff1b;<\/p>\n<li>pathname&#xff1a;\u8868\u793a\u8981\u6253\u5f00\u6587\u4ef6\u7684\u6587\u4ef6\u540d&#xff08;\u4e0d\u5e26\u8def\u5f84\u5c31\u9ed8\u8ba4\u5728\u5f53\u524d\u5de5\u4f5c\u8def\u5f84\u4e0b&#xff09;<\/li>\n<li>flags&#xff1a;\u8868\u793a\u6587\u4ef6\u7684\u6253\u5f00\u65b9\u5f0f&#xff0c;\u5b58\u5728\u591a\u4e2a\u6807\u5fd7\u4f4d<\/li>\n<li>mode&#xff1a;\u8868\u793a\u65b0\u5efa\u6587\u4ef6\u65f6&#xff0c;\u6587\u4ef6\u7684\u9ed8\u8ba4\u6743\u9650<\/li>\n<h4>\u6587\u4ef6\u540dpathname<\/h4>\n<p>\u8fd9\u4e2a\u60f3\u5fc5\u5c31\u4e0d\u7528\u591a\u8bf4\u4e86&#xff0c;\u8868\u793a\u8981\u6253\u5f00\u6587\u4ef6\u7684\u6587\u4ef6\u540d&#xff1b;<\/p>\n<p>\u4e0d\u5e26\u8def\u5f84\u65f6&#xff0c;\u5c31\u8868\u793a\u5728\u5f53\u524d\u5de5\u4f5c\u8def\u5f84\u4e0b\u6253\u5f00\u6587\u4ef6\u3002&#xff08;\u8fdb\u7a0b\u4e2d\u5b58\u5728\u5f53\u524d\u5de5\u4f5c\u8def\u5f84cwd&#xff09;<\/p>\n<h4>\u6807\u5fd7\u4f4dflags<\/h4>\n<p>\u901a\u8fc7\u67e5\u770bopen\u51fd\u6570\u8bf4\u660e\u53ef\u4ee5\u770b\u5230&#xff0c;flags\u5b58\u5728\u975e\u5e38\u591a\u7684\u6807\u5fd7\u4f4d&#xff1b;\u8fd9\u91cc\u5217\u4e3e\u4e00\u4e9b\u5e38\u7528\u7684\u9009\u9879<\/p>\n<p>O_RDONLY\u53ea\u8bfb\u3001O_WRONLY\u53ea\u5199\u3001O_RDWR\u8bfb\u5199&#xff1b;<\/p>\n<p>O_CREAT&#xff1a;\u6587\u4ef6\u4e0d\u5b58\u5728\u65f6\u5c31\u65b0\u5efa\u6587\u4ef6<\/p>\n<p>O_TRUNC&#xff1a;\u6253\u5f00\u6587\u4ef6\u65f6&#xff0c;\u6587\u4ef6\u5b58\u5728\u5c31\u6e05\u7a7a\u6587\u4ef6\u5185\u5bb9<\/p>\n<p>O_APPEND&#xff1a;\u6253\u5f00\u6587\u4ef6\u65f6&#xff0c;\u4ee5\u8ffd\u52a0\u5f62\u5f0f\u6253\u5f00\u3002<\/p>\n<p>\u8fd9\u91ccflags\u8868\u793a\u7684\u5c31\u662f\u6587\u4ef6\u7684\u6253\u5f00\u65b9\u5f0f&#xff1b;<\/p>\n<p>\u9996\u5148\u5c31\u662f&#xff1a;\u53ea\u8bfb\u3001\u53ea\u5199\u548c\u8bfb\u5199&#xff1b;\u5728\u6211\u4eec\u6253\u5f00\u6587\u4ef6\u65f6\u5fc5\u987b\u6307\u5b9a\u4e00\u4e2a\u4e14\u53ea\u80fd\u6307\u5b9a\u4e00\u4e2a\u3002<\/p>\n<p>O_CREAT<\/p>\n<p>\u5728\u6211\u4eec\u6253\u5f00\u4e00\u4e2a\u6587\u4ef6\u65f6&#xff0c;\u5982\u679c\u8fd9\u4e2a\u6587\u4ef6\u4e0d\u5b58\u5728&#xff0c;\u90a3open\u51fd\u6570\u5c31\u4f1a\u76f4\u63a5\u8fd4\u56de-1\u8868\u793a\u6587\u4ef6\u6253\u5f00\u5931\u8d25&#xff1b;<\/p>\n<p>\u800c\u6211\u4eec\u5e26\u4e86O_CREAT\u9009\u9879&#xff0c;\u5c31\u8868\u660e\u5f53\u6587\u4ef6\u4e0d\u5b58\u5728\u65f6&#xff0c;\u5c31\u65b0\u5efa\u6587\u4ef6&#xff1b;&#xff08;\u8fd9\u91cc\u65b0\u5efa\u6587\u4ef6\u8981\u6307\u660e\u65b0\u5efa\u6587\u4ef6\u7684\u6743\u9650&#xff0c;\u5426\u5219\u521b\u5efa\u51fa\u6765\u6587\u4ef6\u7684\u6743\u9650\u5c31\u662f\u4e71\u7801&#xff09;<\/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;stdio.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 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;love.txt&#034;<\/span><span class=\"token punctuation\">,<\/span>O_CREAT <span class=\"token operator\">|<\/span> O_WRONLY<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><span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;open&#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><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\/05\/20250519061403-682acc2b9a728.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>\u4e00\u822c\u60c5\u51b5\u4e0b&#xff0c;\u5728\u4ee5\u5199\u65b9\u5f0f\u6253\u5f00\u6587\u4ef6&#xff0c;\u6587\u4ef6\u4e0d\u5b58\u5728\u5c31\u65b0\u5efa&#xff0c;\u5c31\u8981\u6307\u660e\u6587\u4ef6\u7684\u6743\u9650\u3002<\/p>\n<p>&#xff08;\u4ee5\u53ea\u8bfb\u8bfb\u65b9\u5f0fO_RDONLY&#xff0c;\u6587\u4ef6\u4e0d\u5b58\u5728\u65b0\u5efa\u51fa\u7684\u6587\u4ef6\u662f\u7a7a\u7684&#xff0c;\u6ca1\u6709\u4ec0\u4e48\u610f\u4e49&#xff09;<\/p>\n<p>O_TRUNC<\/p>\n<p>\u5f53\u6211\u4eec\u6253\u5f00\u4e00\u4e2a\u6587\u4ef6\u65f6&#xff0c;\u5982\u679c\u8fd9\u4e2a\u6587\u4ef6\u5df2\u7ecf\u5b58\u5728\u4e86&#xff0c;\u90a3\u5c31\u6253\u5f00\u8fd9\u4e2a\u5df2\u6709\u7684\u6587\u4ef6&#xff1b;<\/p>\n<p>\u5982\u679c\u6211\u4eec\u5e26\u4e86O_TRUNC\u9009\u9879&#xff0c;\u5c31\u8868\u793a\u6e05\u7a7a\u8fd9\u4e2a\u6587\u4ef6\u7684\u5185\u5bb9&#xff1b;<\/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;stdio.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 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;love.txt&#034;<\/span><span class=\"token punctuation\">,<\/span>O_CREAT <span class=\"token operator\">|<\/span> O_WRONLY <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><span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;open&#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><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\/05\/20250519061404-682acc2c4c33b.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>O_APPEND<\/p>\n<p>\u5728C\u8bed\u8a00\u7684\u6587\u4ef6\u64cd\u4f5c\u4e2d&#xff0c;fopen\u6253\u5f00\u6587\u4ef6&#xff0c;w\u5c31\u662f\u4ee5\u5199\u65b9\u5f0f\u6253\u5f00\u3001\u6587\u4ef6\u4e0d\u5b58\u5728\u5c31\u65b0\u5efa\u3001\u6587\u4ef6\u5b58\u5728\u5c31\u6e05\u7a7a\u6587\u4ef6\u7684\u5185\u5bb9&#xff1b;&#xff08;\u8fd9\u5c31\u5bf9\u5e94\u4e86\u4e0a\u8ff0\u9009\u9879\u7684O_WRONLY\u3001O_CREAT\u3001O_TRUNC&#xff09;<\/p>\n<p>\u4f46\u662f\u6211\u4eecfopen\u8fd8\u53ef\u4ee5\u4ee5a\u65b9\u5f0f\u6253\u5f00\u6587\u4ef6&#xff0c;\u4e5f\u5c31\u662f\u8ffd\u52a0\u65b9\u5f0f&#xff1b;\u8fd9\u91cc\u7684O_APPEND\u5c31\u662f\u4ee5\u8ffd\u52a0\u7684\u65b9\u5f0f\u6253\u5f00\u6587\u4ef6\u3002<\/p>\n<p>\u8fd9\u91cc\u6211\u4eec\u5148\u770b\u4e00\u79cd\u73b0\u8c61&#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;stdio.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 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;love.txt&#034;<\/span><span class=\"token punctuation\">,<\/span>O_CREAT <span class=\"token operator\">|<\/span> O_WRONLY<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><span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;open&#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><br \/>\n    <span class=\"token keyword\">char<\/span> buff<span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;abcdef&#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>buff<span class=\"token punctuation\">,<\/span><span class=\"token function\">strlen<\/span><span class=\"token punctuation\">(<\/span>buff<span class=\"token punctuation\">)<\/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><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/05\/20250519061404-682acc2cd8eaa.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>\u53ef\u4ee5\u770b\u5230&#xff0c;\u6211\u4eec\u4e0d\u5e26O_APPEND\u9009\u9879&#xff0c;\u5199\u5165\u7684\u65f6\u5019\u662f\u5728\u6587\u4ef6\u7684\u5f00\u5934\u4f4d\u7f6e\u8fdb\u884c\u5199\u5165\u7684\u3002<\/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;stdio.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 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;love.txt&#034;<\/span><span class=\"token punctuation\">,<\/span>O_CREAT <span class=\"token operator\">|<\/span> O_WRONLY <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><span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">perror<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;open&#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><br \/>\n    <span class=\"token keyword\">char<\/span> buff<span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;abcdef&#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>buff<span class=\"token punctuation\">,<\/span><span class=\"token function\">strlen<\/span><span class=\"token punctuation\">(<\/span>buff<span class=\"token punctuation\">)<\/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><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/05\/20250519061405-682acc2d726d1.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h4>\u6587\u4ef6\u6743\u9650mode<\/h4>\n<p>\u5f53\u6253\u5f00\u6587\u4ef6&#xff0c;\u6587\u4ef6\u4e0d\u5b58\u5728&#xff0c;\u6211\u4eec\u8fd8\u5e26\u4e86O_CREAT\u9009\u9879\u65f6&#xff1b;\u5982\u679c\u6211\u4eec\u4e0d\u5e26\u6587\u4ef6\u7684\u6743\u9650&#xff0c;\u90a3\u65b0\u5efa\u6587\u4ef6\u7684\u6743\u9650\u5c31\u662f\u4e71\u7801&#xff1b;<\/p>\n<p>\u800c\u65b0\u5efa\u7684\u6587\u4ef6\u7684\u6743\u9650&#xff1a;\u6587\u4ef6\u6743\u9650 &#061; \u9ed8\u8ba4\u6743\u9650 &amp;&#xff08;~umask)<\/p>\n<h3>3. \u5173\u95ed\u6587\u4ef6<\/h3>\n<p>\u5173\u95ed\u6587\u4ef6\u7684\u7cfb\u7edf\u8c03\u7528close&#xff0c;\u6839\u636e\u6587\u4ef6\u63cf\u8ff0\u7b26&#xff0c;\u5173\u95ed\u6307\u5b9a\u6587\u4ef6\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/05\/20250519061405-682acc2dcbe70.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>\u5bf9\u4e8e\u8fd9\u91cc\u7684fd&#xff0c;\u5b83\u6307\u7684\u662f\u6587\u4ef6\u63cf\u8ff0\u7b26&#xff0c;\u5f53\u6211\u4eec\u6253\u5f00\u6587\u4ef6\u6210\u529f\u65f6&#xff0c;\u4f1a\u8fd4\u56de\u7ed9\u6211\u4eec\u8be5\u6587\u4ef6\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26&#xff1b;<\/p>\n<p>\u6211\u4eec\u5bf9\u6307\u5b9a\u6587\u4ef6\u7684\u8bfb\u5199\u64cd\u4f5c&#xff0c;\u4ee5\u53ca\u5173\u95ed\u6587\u4ef6\u90fd\u8981\u4f7f\u7528\u6307\u5b9a\u6587\u4ef6\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u3002<\/p>\n<h3>4. \u6587\u4ef6\u5199\u5165write<\/h3>\n<p>\u5728C\u8bed\u8a00\u4e2d&#xff0c;\u6211\u4eec\u8fdb\u884c\u6587\u4ef6\u5199\u5165\u65f6&#xff0c;\u6211\u4eec\u6709\u975e\u5e38\u591a\u7684\u63a5\u53e3&#xff1b;<\/p>\n<p>\u4f46\u662f\u5728\u7cfb\u7edf\u5c42\u9762&#xff0c;\u6211\u4eec\u5bf9\u6587\u4ef6\u8fdb\u884c\u5199\u5165\u53ea\u6709\u4e00\u4e2a\u63a5\u53e3&#xff0c;\u5c31\u662fwrite\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/05\/20250519061405-682acc2ddc701.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>write\u6709\u4e09\u4e2a\u53c2\u6570&#xff0c;\u5206\u522b\u662ffd\u3001buf\u3001\u548ccount&#xff1b;<\/p>\n<p>\u5176\u4e2dfd\u6307\u7684\u662f\u6587\u4ef6\u63cf\u8ff0\u7b26&#xff0c;\u8868\u793a\u6211\u4eec\u8981\u5411\u54ea\u4e00\u4e2a\u6587\u4ef6\u8fdb\u884c\u5199\u5165&#xff1b;<\/p>\n<p>buf\u8868\u793a\u6211\u4eec\u8981\u8fdb\u884c\u5199\u5165\u7684\u5185\u5bb9&#xff0c;\u5b83\u662fvoid*\u7c7b\u578b\u7684\u6307\u9488&#xff0c;\u53ef\u4ee5\u5199\u5165\u4efb\u4f55\u6570\u636e<\/p>\n<p>count\u5c31\u8868\u793a&#xff0c;\u6211\u4eec\u8981\u5199\u5165\u5185\u5bb9\u7684\u957f\u5ea6\u3002<\/p>\n<p>\u8fd9\u91cc\u503c\u7684\u6ce8\u610f\u7684\u662f&#xff1a;\u8fd9\u91ccwrite\u4e3b\u8981\u7528\u4e8e\u5b57\u7b26\u5199\u5165<\/p>\n<p>\u5f53\u7136&#xff0c;\u6211\u4eec\u4e4b\u524d\u542c\u8fc7\u6587\u672c\u5199\u5165\u548c\u4e8c\u8fdb\u5236\u5199\u5165&#xff0c;\u90a3\u90fd\u662f\u8bed\u8a00\u5c42\u7684\u6982\u5ff5&#xff1b;<\/p>\n<p>\u518d\u8fd9\u91cc\u6211\u4eec\u64cd\u4f5c\u7cfb\u7edf\u4e0d\u7ba1\u8fd9\u4e9b&#xff0c;write\u5c31\u5c06\u7ed9\u5b9a\u7684\u5185\u5bb9\u5199\u5165\u5230\u6587\u4ef6\u7f13\u51b2\u533a\u4e2d\u3002<\/p>\n<h3>5. \u6587\u4ef6\u8bfb\u53d6read<\/h3>\n<p>\u548c\u5199\u5165\u4e00\u6837&#xff0c;\u5728\u8bed\u8a00\u5c42\u6211\u4eec\u6709\u975e\u5e38\u591a\u7684\u51fd\u6570\u63a5\u53e3&#xff0c;\u4f46\u662f\u5728\u7cfb\u7edf\u5c42\u9762&#xff0c;\u5c31\u53ea\u6709read\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/05\/20250519061406-682acc2e01975.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>\u8fd9\u6837\u5b58\u5728\u4e09\u4e2a\u53c2\u6570&#xff1b;<\/p>\n<p>fd\u6587\u4ef6\u63cf\u8ff0\u7b26&#xff0c;\u8868\u793a\u8981\u4ece\u54ea\u4e00\u4e2a\u6587\u4ef6\u8bfb\u53d6\u6570\u636e&#xff1b;<\/p>\n<p>buf&#xff0c;\u8868\u793a\u6211\u4eec\u8981\u5c06\u6587\u4ef6\u4e2d\u7684\u6570\u636e\u8bfb\u53d6\u5230buf\u4e2d&#xff1b;<\/p>\n<p>count\u8868\u793a\u8981\u8bfb\u53d6\u5185\u5bb9\u7684\u957f\u5ea6\u3002<\/p>\n<h2>\u6587\u4ef6\u63cf\u8ff0\u7b26<\/h2>\n<p>\u5728\u4e0a\u9762\u63cf\u8ff0\u4e2d&#xff0c;\u6211\u4eec\u4e86\u89e3\u4e86\u6587\u4ef6\u64cd\u4f5c\u76f8\u5173\u7684\u7cfb\u7edf\u8c03\u7528&#xff1b;<\/p>\n<p>\u5728open\u3001write\u3001read\u3001close\u8fd9\u4e9b\u7cfb\u7edf\u8c03\u7528\u4e2d&#xff0c;\u90fd\u7528\u5230\u4e86\u4e00\u4e2afd\u6765\u6307\u660e\u4e00\u4e2a\u6587\u4ef6&#xff1b;\u90a3\u8fd9\u4e2afd\u7a76\u7adf\u662f\u4ec0\u4e48\u5462&#xff1f;<\/p>\n<h3>open\u51fd\u6570\u7684\u8fd4\u56de\u503c<\/h3>\n<p>\u5728\u4e0a\u8ff0\u4f7f\u7528open\u51fd\u6570\u65f6&#xff0c;\u6211\u4eec\u5e76\u6ca1\u6709\u5173\u5fc3open\u51fd\u6570\u7684\u8fd4\u56de\u503c&#xff0c;\u4e5f\u6ca1\u6709\u8bf4\u660e\u6587\u4ef6\u63cf\u8ff0\u7b26\u5230\u5e95\u662f\u4ec0\u4e48&#xff1f;<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/05\/20250519061406-682acc2e1b1f6.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>\u5f53\u6211\u4eec\u4f7f\u7528open\u6253\u5f00\u4e00\u4e2a\u6587\u4ef6\u65f6&#xff1a;<\/p>\n<p>\u5982\u679c\u6253\u5f00\u6210\u529f&#xff0c;\u90a3\u5c31\u8fd4\u56de\u8fd9\u4e2a\u65b0\u6253\u5f00\u6587\u4ef6\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26&#xff1b;<\/p>\n<p>\u5982\u679c\u6253\u5f00\u5931\u8d25&#xff0c;\u5c31\u8fd4\u56de-1&#xff0c;\u5e76\u4e14\u8bbe\u7f6e\u9519\u8bef\u7801\u3002<\/p>\n<h3>\u4ec0\u4e48\u662f\u6587\u4ef6\u63cf\u8ff0\u7b26<\/h3>\n<p>\u90a3\u6211\u4eec\u77e5\u9053\u4e86&#xff0c;\u6587\u4ef6\u63cf\u8ff0\u7b26\u5c31\u662f\u6807\u8bc6\u4e00\u4e2a\u6587\u4ef6\u7684\u6574\u6570&#xff0c;\u6bcf\u4e00\u4e2a\u6587\u4ef6\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u90fd\u4e0d\u4e00\u6837&#xff1b;<\/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;stdio.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 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;log.txt&#034;<\/span><span class=\"token punctuation\">,<\/span>O_CREAT <span class=\"token operator\">|<\/span> O_WRONLY <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><span class=\"token keyword\">return<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;fd : %d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span>fd<span class=\"token punctuation\">)<\/span><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><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/05\/20250519061406-682acc2e414fe.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>\u6211\u4eec\u53ef\u4ee5\u770b\u5230\u6253\u5f00\u7684\u4e00\u4e2a\u6587\u4ef6\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u662f3&#xff1b;<\/p>\n<p>\u8fd9\u91cc\u6253\u5f00\u4e00\u4e2a\u6587\u4ef6\u6211\u4eec\u770b\u4e0d\u51fa\u6765\u4ec0\u4e48&#xff0c;\u6211\u4eec\u591a\u6253\u5f00\u4e00\u4e9b\u6587\u4ef6<\/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;stdio.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 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;log1.txt&#034;<\/span><span class=\"token punctuation\">,<\/span>O_CREAT <span class=\"token operator\">|<\/span> O_WRONLY <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_CREAT <span class=\"token operator\">|<\/span> O_WRONLY <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_CREAT <span class=\"token operator\">|<\/span> O_WRONLY <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_CREAT <span class=\"token operator\">|<\/span> O_WRONLY <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 comment\">\/\/\u8fd9\u91cc\u5c31\u4e0d\u505a\u9519\u8bef\u5224\u65ad\u4e86<\/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><br \/>\n    <span class=\"token comment\">\/\/\u4e0d\u5173\u95ed\u6587\u4ef6&#xff0c;\u8fdb\u7a0b\u7ed3\u675f\u4f1a\u81ea\u52a8\u5173\u95ed<\/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\/05\/20250519061406-682acc2e6dfbe.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>\u8fd9\u91cc&#xff0c;\u6211\u4eec\u53ef\u4ee5\u53d1\u73b0\u6211\u4eec\u6253\u5f00\u591a\u4e2a\u6587\u4ef6&#xff0c;\u8fd9\u4e9b\u6587\u4ef6\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u662f\u7ebf\u6027\u589e\u957f\u7684\u3002<\/p>\n<h3>\u6587\u4ef6\u63cf\u8ff0\u7b260\/1\/2<\/h3>\n<p>\u5728\u4e0a\u8ff0\u4e2d&#xff0c;\u6211\u4eec\u53d1\u73b0&#xff0c;\u6211\u4eec\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u5b83\u662f\u7ebf\u6027\u589e\u957f\u7684&#xff0c;\u800c\u4e14\u6211\u4eec\u6253\u5f00\u7b2c\u4e00\u4e2a\u6587\u4ef6\u5b83\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u662f3&#xff1b;<\/p>\n<p>\u90a30\u30011\u30012\u6587\u4ef6\u63cf\u8ff0\u7b26\u53bb\u54ea\u91cc\u4e86\u5462&#xff1f;<\/p>\n<p>\u8fd8\u8bb0\u5f97\u5728\u7a0b\u5e8f\u8fd0\u884c\u65f6&#xff0c;C\u8bed\u8a00\u4f1a\u9ed8\u8ba4\u7ed9\u6211\u4eec\u6253\u5f00\u4e09\u4e2a\u6587\u4ef6stdin\u3001stdout\u548cstrerr&#xff1b;<\/p>\n<p>\u5728Linux\u64cd\u4f5c\u7cfb\u7edf\u4e2d&#xff0c;\u8fdb\u7a0b\u9ed8\u8ba4\u60c5\u51b5\u4e0b\u4f1a\u6709\u4e09\u4e2a\u7f3a\u7701\u6253\u5f00\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26&#xff08;0\u30011\u30012&#xff09;&#xff0c;\u5206\u522b\u662f\u6807\u51c6\u8f93\u5165\u3001\u6807\u51c6\u8f93\u51fa\u548c\u6807\u51c6\u9519\u8bef\u3002<\/p>\n<p>\u90a3\u8fd9\u91cc\u8fdb\u7a0b\u9ed8\u8ba4\u6253\u5f00\u7684\u6807\u51c6\u8f93\u5165\u3001\u6807\u51c6\u8f93\u51fa\u548c\u6807\u51c6\u9519\u8bef\u548cC\u8bed\u8a00\u4e2d\u7684stdin\u3001stdout\u548cstderr\u6709\u4ec0\u4e48\u533a\u522b\u5462&#xff1f;<\/p>\n<p>\u8fd9\u91cc0\u6807\u51c6\u8f93\u5165\u30011\u6807\u51c6\u8f93\u51fa\u30012\u6807\u51c6\u9519\u8bef&#xff1b;<\/p>\n<p>\u4e00\u822c\u60c5\u51b5\u4e0b0,1,2\u5bf9\u5e94\u7684\u7269\u7406\u8bbe\u5907\u662f\u952e\u76d8\u3001\u663e\u793a\u5668\u3001\u663e\u793a\u5668\u3002<\/p>\n<p>\u6240\u4ee5&#xff0c;\u6211\u4eec\u4ece\u952e\u76d8\u4e2d\u8bfb\u53d6\u6570\u636e\u5c31\u662f\u4ece0\u6587\u4ef6\u4e2d\u8bfb\u53d6\u6570\u636e&#xff1b;\u5c06\u6570\u636e\u8f93\u51fa\u5230\u663e\u793a\u5668\u4e2d\u5c31\u662f\u5c06\u6570\u636e\u8f93\u51fa\u52301\u6587\u4ef6\u5f53\u4e2d\u3002<\/p>\n<h3>\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u5206\u914d\u89c4\u5219<\/h3>\n<p>\u5f53\u6211\u4eec\u6253\u5f00\u4e00\u4e2a\u6587\u4ef6\u65f6&#xff0c;\u5b83\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u662f3&#xff1b;\u6211\u4eec\u6253\u5f00\u591a\u4e2a\u6587\u4ef6\u65f6&#xff0c;\u6211\u4eec\u53ef\u4ee5\u53d1\u73b0\u5b83\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u662f\u7ebf\u6027\u589e\u957f\u7684&#xff1b;<\/p>\n<p>\u90a3\u6587\u4ef6\u63cf\u8ff0\u7b26\u662f\u5982\u4f55\u5206\u914d\u7684\u5462&#xff1f;\u662f\u4e00\u76f4\u5728\u589e\u957f\u7684\u5417&#xff1f;<\/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;stdio.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;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;string.h&gt;<\/span>      <\/span><br \/>\n<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;log1.txt&#034;<\/span><span class=\"token punctuation\">,<\/span>O_CREAT <span class=\"token operator\">|<\/span> O_WRONLY <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>fd1 <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span>  <span class=\"token keyword\">return<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/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\">close<\/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 function\">close<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">2<\/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_CREAT <span class=\"token operator\">|<\/span> O_WRONLY <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>fd2 <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span>  <span class=\"token keyword\">return<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/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 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_CREAT <span class=\"token operator\">|<\/span> O_WRONLY <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>fd3 <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span>  <span class=\"token keyword\">return<\/span> <span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/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 keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span>  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file\u7ed3\u6784\u4f53\u6765\u63cf\u8ff0\u8fd9\u4e9b\u88ab\u6253\u5f00\u7684\u6587\u4ef6&#xff08;struct file\u91cc\u5c31\u53ef\u80fd\u6709\u6587\u4ef6\u63cf\u8ff0\u7b26\u7b49\u7b49\u4e00\u4e9b\u5173\u4e8e\u6587\u4ef6\u7684\u4fe1\u606f&#xff09;\u3002<\/p>\n<p>\u6240\u4ee5&#xff0c;\u5728\u6253\u5f00\u4e00\u4e2a\u6587\u4ef6\u65f6&#xff0c;\u5c31\u53ea\u9700\u6839\u636e\u6587\u4ef6\u7684\u76f8\u5173\u5c5e\u6027\u6784\u5efa\u76f8\u5bf9\u5e94\u7684struct file\u5373\u53ef&#xff08;\u8fd8\u5b58\u5728\u6587\u4ef6\u7f13\u51b2\u533a&#xff0c;\u4e5f\u4f1a\u5c06\u90e8\u5206\u5185\u5bb9\u62f7\u8d1d\u5230\u6587\u4ef6\u7f13\u51b2\u533a\u4e2d&#xff09;<\/p>\n<p>\u518d\u7ec4\u7ec7&#xff1a; \u64cd\u4f5c\u7cfb\u7edf\u8981\u5c06\u8fd9\u4e9b\u88ab\u6253\u5f00\u6587\u4ef6&#xff08;struct file&#xff09;\u8fdb\u884c\u7ba1\u7406&#xff1b;\u5728Linux\u64cd\u4f5c\u7cfb\u7edf\u4e2d\u5c31\u5b58\u5728\u4e00\u4e2a\u5168\u5c40\u94fe\u8868&#xff0c;\u6240\u4ee5\u88ab\u6253\u5f00\u6587\u4ef6\u7684struct file\u90fd\u5728\u8fd9\u4e2a\u94fe\u8868\u5f53\u4e2d\u3002<\/p>\n<p>\u8fd9\u6837\u64cd\u4f5c\u7cfb\u7edf\u5c31\u5c06\u6240\u6709\u88ab\u6253\u5f00\u7684\u6587\u4ef6\u7ba1\u7406\u8d77\u6765\u7684&#xff0c;\u4f46\u662f\u73b0\u5728\u8fd8\u6709\u4e00\u4e2a\u95ee\u9898&#xff0c;\u7a0b\u5e8f\u6253\u5f00\u6587\u4ef6\u4e5f\u5c31\u662f\u8fdb\u7a0b\u8981\u6253\u5f00\u6587\u4ef6&#xff0c;\u90a3\u8fdb\u7a0b\u662f\u5982\u4f55\u6253\u5f00\u7684\u5462&#xff1f;<\/p>\n<p>\u8fd9\u4e2a\u95ee\u9898\u5c31\u6bd4\u8f83\u7b80\u5355\u4e86&#xff0c;\u6211\u4eec\u7684\u8fdb\u7a0b\u4e0d\u662f\u6709\u5bf9\u5e94\u7684task_struct\u5417&#xff0c;\u90a3\u6211\u4eec\u8fdb\u7a0b\u6253\u5f00\u4e86\u54ea\u4e9b\u6587\u4ef6\u5c31\u80af\u5b9a\u5728tasj_struct\u4e2d\u5b58\u50a8\u7740\u76f8\u5bf9\u5e94\u7684\u4fe1\u606f\u3002<\/p>\n<p>\u5728task_struct\u4e2d&#xff0c;\u5b58\u5728\u7740\u4e00\u4e2a\u6307\u9488struct file_struct* files&#xff0c;\u8fd9\u4e2a\u6307\u9488\u6307\u5411\u8fdb\u7a0b\u76f8\u5bf9\u5e94\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u8868&#xff1b;<\/p>\n<p>\u800c\u5728\u6587\u4ef6\u63cf\u8ff0\u7b26\u8868\u4e2d&#xff0c;\u5b58\u5728\u7740\u4e00\u4e2a\u6570\u7ec4struct file* 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