{"id":211671,"date":"2023-12-22T11:51:21","date_gmt":"2023-12-22T03:51:21","guid":{"rendered":"https:\/\/www.idc.net\/help\/211671\/"},"modified":"2023-12-22T11:51:21","modified_gmt":"2023-12-22T03:51:21","slug":"%e4%bf%ae%e5%a4%8d-linux-%e9%94%99%e8%af%af-%e5%9d%8f%e7%9a%84%e6%96%87%e4%bb%b6%e6%8f%8f%e8%bf%b0%e7%ac%a6","status":"publish","type":"post","link":"https:\/\/idc.net\/help\/211671\/","title":{"rendered":"\u4fee\u590d Linux \u9519\u8bef &#8211; \u574f\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26"},"content":{"rendered":"<p><title id=\"%e4%bf%ae%e5%a4%8d-linux-%e9%94%99%e8%af%af-%e5%9d%8f%e7%9a%84%e6%96%87%e4%bb%b6%e6%8f%8f%e8%bf%b0%e7%ac%a6-yVFSCtltLK\">\u4fee\u590d Linux \u9519\u8bef - \u574f\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26<\/title><\/p>\n<h1 id=\"%e4%bf%ae%e5%a4%8d-linux-%e9%94%99%e8%af%af-%e5%9d%8f%e7%9a%84%e6%96%87%e4%bb%b6%e6%8f%8f%e8%bf%b0%e7%ac%a6-yVFSCtltLK\">\u4fee\u590d Linux \u9519\u8bef - \u574f\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26<\/h1>\n<p>\u5728\u4f7f\u7528 Linux \u64cd\u4f5c\u7cfb\u7edf\u65f6\uff0c\u60a8\u53ef\u80fd\u4f1a\u9047\u5230\u5404\u79cd\u9519\u8bef\u3002\u5176\u4e2d\u4e00\u4e2a\u5e38\u89c1\u7684\u9519\u8bef\u662f\u201c\u574f\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u201d\uff08Bad file descriptor\uff09\u3002\u5f53\u60a8\u5c1d\u8bd5\u6253\u5f00\u6216\u8bfb\u53d6\u4e00\u4e2a\u6587\u4ef6\u65f6\uff0c\u7cfb\u7edf\u4f1a\u8fd4\u56de\u8fd9\u4e2a\u9519\u8bef\u3002\u672c\u6587\u5c06\u4ecb\u7ecd\u8fd9\u4e2a\u9519\u8bef\u7684\u539f\u56e0\u4ee5\u53ca\u5982\u4f55\u4fee\u590d\u5b83\u3002<\/p>\n<h2 id=\"%e9%94%99%e8%af%af%e5%8e%9f%e5%9b%a0-yVFSCtltLK\">\u9519\u8bef\u539f\u56e0<\/h2>\n<p>\u201c\u574f\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u201d\u9519\u8bef\u901a\u5e38\u662f\u7531\u4ee5\u4e0b\u51e0\u79cd\u60c5\u51b5\u5f15\u8d77\u7684\uff1a<\/p>\n<ul>\n<li>\u6587\u4ef6\u5df2\u5173\u95ed\uff1a\u5f53\u60a8\u5c1d\u8bd5\u5bf9\u5df2\u5173\u95ed\u7684\u6587\u4ef6\u8fdb\u884c\u64cd\u4f5c\u65f6\uff0c\u7cfb\u7edf\u4f1a\u8fd4\u56de\u8fd9\u4e2a\u9519\u8bef\u3002<\/li>\n<li>\u6587\u4ef6\u63cf\u8ff0\u7b26\u65e0\u6548\uff1a\u5982\u679c\u60a8\u4f7f\u7528\u4e86\u65e0\u6548\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\uff0c\u7cfb\u7edf\u4e5f\u4f1a\u8fd4\u56de\u8fd9\u4e2a\u9519\u8bef\u3002<\/li>\n<li>\u6743\u9650\u95ee\u9898\uff1a\u5982\u679c\u60a8\u6ca1\u6709\u8db3\u591f\u7684\u6743\u9650\u6765\u6253\u5f00\u6216\u8bfb\u53d6\u6587\u4ef6\uff0c\u7cfb\u7edf\u4f1a\u8fd4\u56de\u8fd9\u4e2a\u9519\u8bef\u3002<\/li>\n<\/ul>\n<h2 id=\"%e4%bf%ae%e5%a4%8d%e6%96%b9%e6%b3%95-yVFSCtltLK\">\u4fee\u590d\u65b9\u6cd5<\/h2>\n<p>\u8981\u4fee\u590d\u201c\u574f\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u201d\u9519\u8bef\uff0c\u60a8\u53ef\u4ee5\u5c1d\u8bd5\u4ee5\u4e0b\u51e0\u79cd\u65b9\u6cd5\uff1a<\/p>\n<h3 id=\"1-%e6%a3%80%e6%9f%a5%e6%96%87%e4%bb%b6%e6%98%af%e5%90%a6%e5%b7%b2%e5%85%b3%e9%97%ad-yVFSCtltLK\">1. \u68c0\u67e5\u6587\u4ef6\u662f\u5426\u5df2\u5173\u95ed<\/h3>\n<p>\u9996\u5148\uff0c\u60a8\u9700\u8981\u786e\u4fdd\u6587\u4ef6\u6ca1\u6709\u88ab\u5173\u95ed\u3002\u5982\u679c\u60a8\u5728\u64cd\u4f5c\u6587\u4ef6\u4e4b\u524d\u5173\u95ed\u4e86\u5b83\uff0c\u60a8\u9700\u8981\u91cd\u65b0\u6253\u5f00\u6587\u4ef6\u5e76\u518d\u6b21\u5c1d\u8bd5\u64cd\u4f5c\u3002<\/p>\n<h3 id=\"2-%e6%a3%80%e6%9f%a5%e6%96%87%e4%bb%b6%e6%8f%8f%e8%bf%b0%e7%ac%a6%e6%98%af%e5%90%a6%e6%9c%89%e6%95%88-yVFSCtltLK\">2. \u68c0\u67e5\u6587\u4ef6\u63cf\u8ff0\u7b26\u662f\u5426\u6709\u6548<\/h3>\n<p>\u5982\u679c\u60a8\u4f7f\u7528\u4e86\u65e0\u6548\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\uff0c\u60a8\u9700\u8981\u786e\u4fdd\u60a8\u6b63\u5728\u4f7f\u7528\u6b63\u786e\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u3002\u60a8\u53ef\u4ee5\u901a\u8fc7\u68c0\u67e5\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u503c\u6765\u786e\u8ba4\u5b83\u662f\u5426\u6709\u6548\u3002\u5982\u679c\u6587\u4ef6\u63cf\u8ff0\u7b26\u4e3a\u8d1f\u6570\u6216\u4e3a\u96f6\uff0c\u90a3\u4e48\u5b83\u662f\u65e0\u6548\u7684\u3002\u60a8\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u4ee3\u7801\u793a\u4f8b\u6765\u68c0\u67e5\u6587\u4ef6\u63cf\u8ff0\u7b26\uff1a<\/p>\n<pre><code>\n#include &lt;stdio.h&gt;\n#include &lt;fcntl.h&gt;\n\nint main() {\n    int fd = open(\"file.txt\", O_RDONLY);\n    if (fd &lt;= 0) {\n        printf(\"Invalid file descriptorn\");\n    } else {\n        printf(\"Valid file descriptorn\");\n    }\n    return 0;\n}\n<\/code><\/pre>\n<p>\u5728\u4e0a\u9762\u7684\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u4f7f\u7528\u4e86 open() \u51fd\u6570\u6765\u6253\u5f00\u4e00\u4e2a\u6587\u4ef6\uff0c\u5e76\u68c0\u67e5\u8fd4\u56de\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u662f\u5426\u6709\u6548\u3002<\/p>\n<h3 id=\"3-%e6%a3%80%e6%9f%a5%e6%96%87%e4%bb%b6%e6%9d%83%e9%99%90-yVFSCtltLK\">3. \u68c0\u67e5\u6587\u4ef6\u6743\u9650<\/h3>\n<p>\u5982\u679c\u60a8\u6ca1\u6709\u8db3\u591f\u7684\u6743\u9650\u6765\u6253\u5f00\u6216\u8bfb\u53d6\u6587\u4ef6\uff0c\u60a8\u9700\u8981\u68c0\u67e5\u6587\u4ef6\u7684\u6743\u9650\u8bbe\u7f6e\u3002\u60a8\u53ef\u4ee5\u4f7f\u7528 ls -l \u547d\u4ee4\u6765\u67e5\u770b\u6587\u4ef6\u7684\u6743\u9650\u3002\u5982\u679c\u60a8\u6ca1\u6709\u8db3\u591f\u7684\u6743\u9650\uff0c\u60a8\u53ef\u4ee5\u4f7f\u7528 chmod \u547d\u4ee4\u6765\u66f4\u6539\u6587\u4ef6\u7684\u6743\u9650\u3002<\/p>\n<pre><code>\nchmod +r file.txt\n<\/code><\/pre>\n<p>\u4e0a\u9762\u7684\u547d\u4ee4\u5c06\u6587\u4ef6 file.txt \u7684\u6743\u9650\u8bbe\u7f6e\u4e3a\u53ef\u8bfb\u3002<\/p>\n<h2 id=\"%e6%80%bb%e7%bb%93-yVFSCtltLK\">\u603b\u7ed3<\/h2>\n<p>\u4fee\u590d Linux \u9519\u8bef - \u574f\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u53ef\u80fd\u9700\u8981\u60a8\u68c0\u67e5\u6587\u4ef6\u662f\u5426\u5df2\u5173\u95ed\u3001\u6587\u4ef6\u63cf\u8ff0\u7b26\u662f\u5426\u6709\u6548\u4ee5\u53ca\u6587\u4ef6\u7684\u6743\u9650\u8bbe\u7f6e\u3002\u901a\u8fc7\u9075\u5faa\u4e0a\u8ff0\u65b9\u6cd5\uff0c\u60a8\u5e94\u8be5\u80fd\u591f\u89e3\u51b3\u8fd9\u4e2a\u9519\u8bef\u3002<\/p>\n<p>\u9999\u6e2f\u670d\u52a1\u5668\u9996\u9009\u540e\u6d6a\u4e91\uff0c\u63d0\u4f9b\u53ef\u9760\u7684\u4e91\u8ba1\u7b97\u670d\u52a1\u3002\u60a8\u53ef\u4ee5\u5728<a href=\"https:\/\/idc.net\">https:\/\/idc.net<\/a>\u4e86\u89e3\u66f4\u591a\u5173\u4e8e\u6211\u4eec\u7684\u4ea7\u54c1\u548c\u670d\u52a1\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4fee\u590d Linux \u9519\u8bef - \u574f\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26 \u4fee\u590d Linux \u9519\u8bef - \u574f\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26 \u5728\u4f7f\u7528 Linux \u64cd [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[27],"tags":[],"class_list":["post-211671","post","type-post","status-publish","format-standard","hentry","category-centos"],"_links":{"self":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts\/211671","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/comments?post=211671"}],"version-history":[{"count":0,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts\/211671\/revisions"}],"wp:attachment":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/media?parent=211671"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/categories?post=211671"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/tags?post=211671"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}