{"id":134495,"date":"2024-03-26T08:00:43","date_gmt":"2024-03-25T23:00:43","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/linux-%e3%81%ae-lseek-%e9%96%a2%e6%95%b0%e3%81%ae%e4%bd%bf%e3%81%84%e6%96%b9\/"},"modified":"2024-04-05T01:18:52","modified_gmt":"2024-04-04T16:18:52","slug":"linux-%e3%81%ae-lseek-%e9%96%a2%e6%95%b0%e3%81%ae%e4%bd%bf%e3%81%84%e6%96%b9","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/linux-%e3%81%ae-lseek-%e9%96%a2%e6%95%b0%e3%81%ae%e4%bd%bf%e3%81%84%e6%96%b9\/","title":{"rendered":"Linux \u306e lseek \u95a2\u6570\u306e\u4f7f\u3044\u65b9"},"content":{"rendered":"<p>Linux\u306b\u304a\u3051\u308blseek\u95a2\u6570\u306f\u3001\u30d5\u30a1\u30a4\u30eb\u5185\u306e\u8aad\u307f\u66f8\u304d\u4f4d\u7f6e\u3092\u6307\u5b9a\u3059\u308b\u305f\u3081\u30d5\u30a1\u30a4\u30eb\u30aa\u30d5\u30bb\u30c3\u30c8\u3092\u8a2d\u5b9a\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>lseek\u95a2\u6570\u306e\u30d7\u30ed\u30c8\u30bf\u30a4\u30d7\u3092\u6b21\u306b\u793a\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-meta\">#<span class=\"hljs-keyword\">include<\/span> <span class=\"hljs-string\">&lt;sys\/types.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<span class=\"hljs-type\">off_t<\/span> <span class=\"hljs-title function_\">lseek<\/span><span class=\"hljs-params\">(<span class=\"hljs-type\">int<\/span> fd, <span class=\"hljs-type\">off_t<\/span> offset, <span class=\"hljs-type\">int<\/span> whence)<\/span>;\r\n<\/code><\/pre>\n<p>\u5f15\u6570\u306e\u8aac\u660e:<\/p>\n<ol>\n<li>fd\uff1a\u30d5\u30a1\u30a4\u30eb\u30c7\u30a3\u30b9\u30af\u30ea\u30d7\u30bf\u3002\u30b7\u30fc\u30af\u3059\u308b\u30d5\u30a1\u30a4\u30eb\u3092\u8868\u3057\u307e\u3059\u3002<\/li>\n<li>\u30aa\u30d5\u30bb\u30c3\u30c8: whence\u30d1\u30e9\u30e1\u30fc\u30bf\u3067\u6307\u5b9a\u3057\u305f\u4f4d\u7f6e\u304b\u3089\u306e\u4f4d\u7f6e\u3092\u793a\u3057\u307e\u3059\u3002<\/li>\n<li>\u4f4d\u7f6e\u6c7a\u3081\u65b9\u6cd5\u3067\u3001\u4ee5\u4e0b\u306e\u5024\u304c\u3042\u308a\u307e\u3059\u3002<\/li>\n<li>SEEK_SET\uff1a \u30d5\u30a1\u30a4\u30eb\u306e\u59cb\u3081\u304b\u3089\u30aa\u30d5\u30bb\u30c3\u30c8\u3092\u8a08\u7b97\u3059\u308b\u3002<\/li>\n<li>SEEK_CUR\uff1a\u73fe\u5728\u306e\u4f4d\u7f6e\u304b\u3089\u306e\u30aa\u30d5\u30bb\u30c3\u30c8\u91cf<\/li>\n<li>SEEK_END:\u30d5\u30a1\u30a4\u30eb\u672b\u5c3e\u304b\u3089\u30aa\u30d5\u30bb\u30c3\u30c8\u3092\u8a08\u7b97\u3057\u307e\u3059\u3002<\/li>\n<\/ol>\n<p>\u8fd4\u5374\u5024<\/p>\n<ol>\n<li>\u6210\u529f\u3057\u305f\u5834\u5408\u3001\u65b0\u3057\u3044\u30aa\u30d5\u30bb\u30c3\u30c8\u3092\u8fd4\u3057\u307e\u3059\u3002<\/li>\n<li>\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u305f\u5834\u5408\u306f-1\u3092\u8fd4\u3057\u3001errno\u306b\u30a8\u30e9\u30fc\u30b3\u30fc\u30c9\u3092\u30bb\u30c3\u30c8\u3059\u308b\u3002<\/li>\n<\/ol>\n<p>\u4ee5\u4e0b\u306e\u4f8b\u3067\u306f\u3001lseek \u95a2\u6570\u306e\u4f7f\u7528\u6cd5\u3092\u793a\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-meta\">#<span class=\"hljs-keyword\">include<\/span> <span class=\"hljs-string\">&lt;sys\/types.h&gt;<\/span><\/span>\r\n<span class=\"hljs-meta\">#<span class=\"hljs-keyword\">include<\/span> <span class=\"hljs-string\">&lt;sys\/stat.h&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<span class=\"hljs-meta\">#<span class=\"hljs-keyword\">include<\/span> <span class=\"hljs-string\">&lt;stdio.h&gt;<\/span><\/span>\r\n<span class=\"hljs-type\">int<\/span> <span class=\"hljs-title function_\">main<\/span><span class=\"hljs-params\">()<\/span> {\r\n<span class=\"hljs-type\">int<\/span> fd;\r\n<span class=\"hljs-type\">off_t<\/span> offset;\r\n<span class=\"hljs-comment\">\/\/ \u6253\u5f00\u4e00\u4e2a\u6587\u4ef6<\/span>\r\nfd = open(<span class=\"hljs-string\">\"file.txt\"<\/span>, O_RDONLY);\r\n<span class=\"hljs-keyword\">if<\/span> (fd == <span class=\"hljs-number\">-1<\/span>) {\r\nperror(<span class=\"hljs-string\">\"open\"<\/span>);\r\n<span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-number\">1<\/span>;\r\n}\r\n<span class=\"hljs-comment\">\/\/ \u8bbe\u7f6e\u6587\u4ef6\u504f\u79fb\u91cf\u4e3a10<\/span>\r\noffset = lseek(fd, <span class=\"hljs-number\">10<\/span>, SEEK_SET);\r\n<span class=\"hljs-keyword\">if<\/span> (offset == <span class=\"hljs-number\">-1<\/span>) {\r\nperror(<span class=\"hljs-string\">\"lseek\"<\/span>);\r\n<span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-number\">1<\/span>;\r\n}\r\n<span class=\"hljs-comment\">\/\/ \u8bfb\u53d6\u6587\u4ef6\u4e2d\u7684\u6570\u636e<\/span>\r\n<span class=\"hljs-type\">char<\/span> buffer[<span class=\"hljs-number\">10<\/span>];\r\n<span class=\"hljs-type\">ssize_t<\/span> bytesRead = read(fd, buffer, <span class=\"hljs-keyword\">sizeof<\/span>(buffer));\r\n<span class=\"hljs-keyword\">if<\/span> (bytesRead == <span class=\"hljs-number\">-1<\/span>) {\r\nperror(<span class=\"hljs-string\">\"read\"<\/span>);\r\n<span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-number\">1<\/span>;\r\n}\r\n<span class=\"hljs-comment\">\/\/ \u8f93\u51fa\u8bfb\u53d6\u7684\u6570\u636e<\/span>\r\n<span class=\"hljs-built_in\">printf<\/span>(<span class=\"hljs-string\">\"Read: %.*s\\n\"<\/span>, (<span class=\"hljs-type\">int<\/span>)bytesRead, buffer);\r\n<span class=\"hljs-comment\">\/\/ \u5173\u95ed\u6587\u4ef6<\/span>\r\nclose(fd);\r\n<span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-number\">0<\/span>;\r\n}\r\n<\/code><\/pre>\n<p>\u4e0a\u306e\u4f8b\u3067\u306f\u3001\u307e\u305aopen\u95a2\u6570\u3067\u30d5\u30a1\u30a4\u30eb\u3092\u958b\u304d\u3001\u30d5\u30a1\u30a4\u30eb\u8a18\u8ff0\u5b50fd\u3092\u53d6\u5f97\u3057\u307e\u3057\u305f\u3002\u6b21\u306blseek\u95a2\u6570\u3067\u30d5\u30a1\u30a4\u30eb\u30aa\u30d5\u30bb\u30c3\u30c8\u309210\u306b\u8a2d\u5b9a\u3057\u307e\u3057\u305f\u3002\u7d9a\u3044\u3066read\u95a2\u6570\u3067\u30aa\u30d5\u30bb\u30c3\u30c8\u4f4d\u7f6e\u304b\u308910\u30d0\u30a4\u30c8\u306e\u30c7\u30fc\u30bf\u3092\u8aad\u307f\u8fbc\u307f\u3001\u30b3\u30f3\u30bd\u30fc\u30eb\u306b\u51fa\u529b\u3057\u307e\u3057\u305f\u3002\u6700\u5f8c\u306bclose\u95a2\u6570\u3067\u30d5\u30a1\u30a4\u30eb\u3092\u9589\u3058\u307e\u3057\u305f\u3002<\/p>\n<p>lseek\u95a2\u6570\u306f\u30d5\u30a1\u30a4\u30eb\u4e0a\u306e\u4efb\u610f\u306e\u4f4d\u7f6e\u304b\u3089\u8aad\u307f\u66f8\u304d\u304c\u53ef\u80fd\u3067\u3059\u304c\u3001\u30aa\u30d5\u30bb\u30c3\u30c8\u3092\u30d5\u30a1\u30a4\u30eb\u306e\u672b\u5c3e\u4ee5\u964d\u306b\u8a2d\u5b9a\u3059\u308b\u3068\u30c7\u30fc\u30bf\u306e\u8aad\u307f\u66f8\u304d\u306f\u884c\u3048\u307e\u305b\u3093\u3002\u30d5\u30a1\u30a4\u30eb\u306e\u30b5\u30a4\u30ba\u306f\u81ea\u52d5\u7684\u306b\u62e1\u5f35\u3055\u308c\u306a\u3044\u304b\u3089\u3067\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Linux\u306b\u304a\u3051\u308blseek\u95a2\u6570\u306f\u3001\u30d5\u30a1\u30a4\u30eb\u5185\u306e\u8aad\u307f\u66f8\u304d\u4f4d\u7f6e\u3092\u6307\u5b9a\u3059\u308b\u305f\u3081\u30d5\u30a1\u30a4\u30eb\u30aa\u30d5\u30bb\u30c3\u30c8\u3092\u8a2d\u5b9a\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3067\u304d\u307e\u3059\u3002 lseek\u95a2\u6570\u306e\u30d7\u30ed\u30c8\u30bf\u30a4\u30d7\u3092\u6b21\u306b\u793a\u3057\u307e\u3059\u3002 #include &lt;sys\/types.h&#038; [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-134495","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>Linux \u306e lseek \u95a2\u6570\u306e\u4f7f\u3044\u65b9 - 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\/linux-\u306e-lseek-\u95a2\u6570\u306e\u4f7f\u3044\u65b9\/\" \/>\n<meta property=\"og:locale\" content=\"ja_JP\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Linux \u306e lseek \u95a2\u6570\u306e\u4f7f\u3044\u65b9\" \/>\n<meta property=\"og:description\" content=\"Linux\u306b\u304a\u3051\u308blseek\u95a2\u6570\u306f\u3001\u30d5\u30a1\u30a4\u30eb\u5185\u306e\u8aad\u307f\u66f8\u304d\u4f4d\u7f6e\u3092\u6307\u5b9a\u3059\u308b\u305f\u3081\u30d5\u30a1\u30a4\u30eb\u30aa\u30d5\u30bb\u30c3\u30c8\u3092\u8a2d\u5b9a\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3067\u304d\u307e\u3059\u3002 lseek\u95a2\u6570\u306e\u30d7\u30ed\u30c8\u30bf\u30a4\u30d7\u3092\u6b21\u306b\u793a\u3057\u307e\u3059\u3002 #include &lt;sys\/types.h&amp; [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/ja\/blog\/linux-\u306e-lseek-\u95a2\u6570\u306e\u4f7f\u3044\u65b9\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - Silicon Cloud\" \/>\n<meta property=\"article:published_time\" content=\"2024-03-25T23:00:43+00:00\" \/>\n<meta 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