{"id":115842,"date":"2024-03-23T04:21:26","date_gmt":"2024-03-22T19:21:26","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/c%e3%81%aeopen%e9%96%a2%e6%95%b0%e3%81%ae%e4%bd%bf%e3%81%84%e6%96%b9%e3%81%af\/"},"modified":"2024-03-28T01:46:53","modified_gmt":"2024-03-27T16:46:53","slug":"c%e3%81%aeopen%e9%96%a2%e6%95%b0%e3%81%ae%e4%bd%bf%e3%81%84%e6%96%b9%e3%81%af","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/c%e3%81%aeopen%e9%96%a2%e6%95%b0%e3%81%ae%e4%bd%bf%e3%81%84%e6%96%b9%e3%81%af\/","title":{"rendered":"C++\u306eopen\u95a2\u6570\u306e\u4f7f\u3044\u65b9\u306f?"},"content":{"rendered":"<p>C++ \u306e open() \u95a2\u6570\u306f\u30d5\u30a1\u30a4\u30eb\u3092\u30aa\u30fc\u30d7\u30f3\u3057\u3001\u305d\u306e\u5f8c\u306e\u8aad\u307f\u66f8\u304d\u64cd\u4f5c\u306b\u4f7f\u7528\u3067\u304d\u308b\u30d5\u30a1\u30a4\u30eb\u30c7\u30a3\u30b9\u30af\u30ea\u30d7\u30bf\u3092\u8fd4\u3057\u307e\u3059\u3002\u3053\u306e\u95a2\u6570\u306e\u30d7\u30ed\u30c8\u30bf\u30a4\u30d7\u306f\u6b21\u306e\u3068\u304a\u308a\u3067\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-meta\">#<span class=\"hljs-keyword\">include<\/span> <span class=\"hljs-string\">&lt;fcntl.h&gt;<\/span><\/span>\r\n\r\n<span class=\"hljs-function\"><span class=\"hljs-type\">int<\/span> <span class=\"hljs-title\">open<\/span><span class=\"hljs-params\">(<span class=\"hljs-type\">const<\/span> <span class=\"hljs-type\">char<\/span> *pathname, <span class=\"hljs-type\">int<\/span> flags)<\/span><\/span>;\r\n<span class=\"hljs-function\"><span class=\"hljs-type\">int<\/span> <span class=\"hljs-title\">open<\/span><span class=\"hljs-params\">(<span class=\"hljs-type\">const<\/span> <span class=\"hljs-type\">char<\/span> *pathname, <span class=\"hljs-type\">int<\/span> flags, <span class=\"hljs-type\">mode_t<\/span> mode)<\/span><\/span>;\r\n<\/code><\/pre>\n<p>\u30d1\u30e9\u30e1\u30fc\u30bf\u30fc\u306e\u8aac\u660e\u3002<\/p>\n<ol>\n<li>pathname:\u30d5\u30a1\u30a4\u30eb\u3092\u958b\u304f\u70ba\u306e\u30d1\u30b9\u540d\u3067\u3059\u3002<\/li>\n<li>flags: \u30d5\u30a1\u30a4\u30eb\u306e\u30aa\u30fc\u30d7\u30f3\u65b9\u6cd5\u3068\u64cd\u4f5c\u65b9\u6cd5\u3092\u6307\u5b9a\u3059\u308b\u30d5\u30e9\u30b0\u30d1\u30e9\u30e1\u30fc\u30bf<\/li>\n<li>mode\uff1a\u30d5\u30a1\u30a4\u30eb\u306e\u30d1\u30fc\u30df\u30c3\u30b7\u30e7\u30f3\u3092\u6307\u5b9a\u3059\u308b\u305f\u3081\u306e\u30aa\u30d7\u30b7\u30e7\u30f3\u5f15\u6570<\/li>\n<\/ol>\n<p>open()\u95a2\u6570\u306f\u6b63\u306e\u6574\u6570\u3067\uff0c\u30d5\u30a1\u30a4\u30eb\u30c7\u30a3\u30b9\u30af\u30ea\u30d7\u30bf\u3092\u8868\u3057\u307e\u3059\u3002\u30d5\u30a1\u30a4\u30eb\u3092\u958b\u304f\u3053\u3068\u304c\u5931\u6557\u3057\u305f\u5834\u5408\u3001-1\u3092\u8fd4\u3057\u3001\u30a8\u30e9\u30fc\u306e\u7a2e\u985e\u3092\u793a\u3059errno\u30b0\u30ed\u30fc\u30d0\u30eb\u5909\u6570\u3092\u8a2d\u5b9a\u3057\u307e\u3059\u3002<\/p>\n<p>\u6b21\u306b\u4e00\u822c\u7684\u306a flags \u30d1\u30e9\u30e1\u30fc\u30bf\u30fc\u3068\u5bfe\u5fdc\u3059\u308b\u610f\u5473\u3092\u793a\u3057\u307e\u3059\u3002<\/p>\n<ol>\n<li>O_RDONLY\uff1a\u30d5\u30a1\u30a4\u30eb\u3092\u3001\u8aad\u307f\u53d6\u308a\u5c02\u7528\u30e2\u30fc\u30c9\u3067\u958b\u304d\u307e\u3059\u3002<\/li>\n<li>\u66f8\u304d\u8fbc\u307f\u5c02\u7528\u3067\u30d5\u30a1\u30a4\u30eb\u3092\u958b\u304f<\/li>\n<li>O_RDWR: \u30d5\u30a1\u30a4\u30eb\u3092\u8aad\u307f\u66f8\u304d\u30e2\u30fc\u30c9\u3067\u958b\u304f\u3002<\/li>\n<li>\u30d5\u30a1\u30a4\u30eb\u304c\u5b58\u5728\u3057\u306a\u3044\u5834\u5408\u3001\u30d5\u30a1\u30a4\u30eb\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002<\/li>\n<li>\u30d5\u30a1\u30a4\u30eb\u304c\u3059\u3067\u306b\u5b58\u5728\u3057\u3066\u3044\u3066\u66f8\u304d\u8fbc\u307f\u53ef\u80fd\u3067\u3042\u308c\u3070\u3001\u30d5\u30a1\u30a4\u30eb\u9577\u30920\u306b\u5207\u308a\u8a70\u3081\u307e\u3059\u3002<\/li>\n<li>\u30d5\u30a1\u30a4\u30eb\u306e\u5185\u5bb9\u306e\u672b\u5c3e\u306b\u8ffd\u52a0\u3067\u66f8\u304d\u8fbc\u3080<\/li>\n<\/ol>\n<p>\u4ee5\u4e0b\u306b open() \u95a2\u6570\u3092\u4f7f\u7528\u3057\u3066\u30d5\u30a1\u30a4\u30eb\u3092\u30aa\u30fc\u30d7\u30f3\u3057\u3066\u8aad\u307f\u66f8\u304d\u64cd\u4f5c\u3059\u308b\u65b9\u6cd5\u3092\u793a\u3059\u3001\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3092\u8a18\u8f09\u3057\u307e\u3059\uff1a<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-meta\">#<span class=\"hljs-keyword\">include<\/span> <span class=\"hljs-string\">&lt;iostream&gt;<\/span><\/span>\r\n<span class=\"hljs-meta\">#<span class=\"hljs-keyword\">include<\/span> <span class=\"hljs-string\">&lt;fcntl.h&gt;<\/span><\/span>\r\n<span class=\"hljs-meta\">#<span class=\"hljs-keyword\">include<\/span> <span class=\"hljs-string\">&lt;unistd.h&gt;<\/span><\/span>\r\n\r\n<span class=\"hljs-function\"><span class=\"hljs-type\">int<\/span> <span class=\"hljs-title\">main<\/span><span class=\"hljs-params\">()<\/span> <\/span>{\r\n    <span class=\"hljs-type\">int<\/span> fd = <span class=\"hljs-built_in\">open<\/span>(<span class=\"hljs-string\">\"example.txt\"<\/span>, O_RDWR | O_CREAT, <span class=\"hljs-number\">0644<\/span>); <span class=\"hljs-comment\">\/\/ \u6253\u5f00\u6216\u521b\u5efaexample.txt\u6587\u4ef6\uff0c\u5e76\u4ee5\u8bfb\u5199\u65b9\u5f0f\u6253\u5f00<\/span>\r\n\r\n    <span class=\"hljs-keyword\">if<\/span> (fd == <span class=\"hljs-number\">-1<\/span>) { <span class=\"hljs-comment\">\/\/ \u6253\u5f00\u6587\u4ef6\u5931\u8d25<\/span>\r\n        std::cerr &lt;&lt; <span class=\"hljs-string\">\"Failed to open file\"<\/span> &lt;&lt; std::endl;\r\n        <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-number\">1<\/span>;\r\n    }\r\n\r\n    <span class=\"hljs-type\">char<\/span> buffer[<span class=\"hljs-number\">100<\/span>];\r\n    <span class=\"hljs-type\">ssize_t<\/span> bytesRead = <span class=\"hljs-built_in\">read<\/span>(fd, buffer, <span class=\"hljs-built_in\">sizeof<\/span>(buffer)); <span class=\"hljs-comment\">\/\/ \u4ece\u6587\u4ef6\u4e2d\u8bfb\u53d6\u6570\u636e<\/span>\r\n\r\n    <span class=\"hljs-keyword\">if<\/span> (bytesRead == <span class=\"hljs-number\">-1<\/span>) { <span class=\"hljs-comment\">\/\/ \u8bfb\u53d6\u6587\u4ef6\u5931\u8d25<\/span>\r\n        std::cerr &lt;&lt; <span class=\"hljs-string\">\"Failed to read file\"<\/span> &lt;&lt; std::endl;\r\n        <span class=\"hljs-built_in\">close<\/span>(fd);\r\n        <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-number\">1<\/span>;\r\n    }\r\n\r\n    <span class=\"hljs-type\">ssize_t<\/span> bytesWritten = <span class=\"hljs-built_in\">write<\/span>(fd, <span class=\"hljs-string\">\"Hello, World!\"<\/span>, <span class=\"hljs-number\">13<\/span>); <span class=\"hljs-comment\">\/\/ \u5411\u6587\u4ef6\u4e2d\u5199\u5165\u6570\u636e<\/span>\r\n\r\n    <span class=\"hljs-keyword\">if<\/span> (bytesWritten == <span class=\"hljs-number\">-1<\/span>) { <span class=\"hljs-comment\">\/\/ \u5199\u5165\u6587\u4ef6\u5931\u8d25<\/span>\r\n        std::cerr &lt;&lt; <span class=\"hljs-string\">\"Failed to write file\"<\/span> &lt;&lt; std::endl;\r\n        <span class=\"hljs-built_in\">close<\/span>(fd);\r\n        <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-number\">1<\/span>;\r\n    }\r\n\r\n    <span class=\"hljs-built_in\">close<\/span>(fd); <span class=\"hljs-comment\">\/\/ \u5173\u95ed\u6587\u4ef6\u63cf\u8ff0\u7b26<\/span>\r\n\r\n    <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-number\">0<\/span>;\r\n}\r\n<\/code><\/pre>\n<p>\u4e0a\u8a18\u30b5\u30f3\u30d7\u30eb\u3067\u306f\u3001open()\u95a2\u6570\u3067example.txt\u3068\u3044\u3046\u30d5\u30a1\u30a4\u30eb\u3092\u958b\u304f\u304b\u4f5c\u6210\u3057\u3001\u8aad\u307f\u66f8\u304d\u30e2\u30fc\u30c9\u3067\u30aa\u30fc\u30d7\u30f3\u3057\u307e\u3059\u3002\u6b21\u306b\u3001read()\u95a2\u6570\u3067\u30d5\u30a1\u30a4\u30eb\u304b\u3089\u30c7\u30fc\u30bf\u3092\u8aad\u307f\u51fa\u3057\u3001\u305d\u306e\u30c7\u30fc\u30bf\u3092buffer\u3068\u3044\u3046\u914d\u5217\u306b\u683c\u7d0d\u3057\u307e\u3059\u3002\u7d9a\u3044\u3066\u3001write()\u95a2\u6570\u3067\u30d5\u30a1\u30a4\u30eb\u306b\u30c7\u30fc\u30bf\u3092\u66f8\u304d\u8fbc\u307f\u307e\u3059\u3002\u6700\u5f8c\u306b\u3001close()\u95a2\u6570\u3067\u30d5\u30a1\u30a4\u30eb\u30c7\u30a3\u30b9\u30af\u30ea\u30d7\u30bf\u3092\u30af\u30ed\u30fc\u30ba\u3057\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>C++ \u306e open() \u95a2\u6570\u306f\u30d5\u30a1\u30a4\u30eb\u3092\u30aa\u30fc\u30d7\u30f3\u3057\u3001\u305d\u306e\u5f8c\u306e\u8aad\u307f\u66f8\u304d\u64cd\u4f5c\u306b\u4f7f\u7528\u3067\u304d\u308b\u30d5\u30a1\u30a4\u30eb\u30c7\u30a3\u30b9\u30af\u30ea\u30d7\u30bf\u3092\u8fd4\u3057\u307e\u3059\u3002\u3053\u306e\u95a2\u6570\u306e\u30d7\u30ed\u30c8\u30bf\u30a4\u30d7\u306f\u6b21\u306e\u3068\u304a\u308a\u3067\u3059\u3002 #include &lt;fcntl.h&gt; int  [&hellip;]<\/p>\n","protected":false},"author":12,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-115842","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>C++\u306eopen\u95a2\u6570\u306e\u4f7f\u3044\u65b9\u306f? - Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/ja\/blog\/c\u306eopen\u95a2\u6570\u306e\u4f7f\u3044\u65b9\u306f\/\" \/>\n<meta property=\"og:locale\" content=\"ja_JP\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"C++\u306eopen\u95a2\u6570\u306e\u4f7f\u3044\u65b9\u306f?\" \/>\n<meta property=\"og:description\" content=\"C++ \u306e open() \u95a2\u6570\u306f\u30d5\u30a1\u30a4\u30eb\u3092\u30aa\u30fc\u30d7\u30f3\u3057\u3001\u305d\u306e\u5f8c\u306e\u8aad\u307f\u66f8\u304d\u64cd\u4f5c\u306b\u4f7f\u7528\u3067\u304d\u308b\u30d5\u30a1\u30a4\u30eb\u30c7\u30a3\u30b9\u30af\u30ea\u30d7\u30bf\u3092\u8fd4\u3057\u307e\u3059\u3002\u3053\u306e\u95a2\u6570\u306e\u30d7\u30ed\u30c8\u30bf\u30a4\u30d7\u306f\u6b21\u306e\u3068\u304a\u308a\u3067\u3059\u3002 #include &lt;fcntl.h&gt; int [&hellip;]\" \/>\n<meta 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