{"id":1223,"date":"2026-10-24T04:00:00","date_gmt":"2026-10-23T19:00:00","guid":{"rendered":"https:\/\/quantumsea.net\/?p=1223"},"modified":"2026-10-22T21:30:13","modified_gmt":"2026-10-22T12:30:13","slug":"qs-pread-offset-concurrency-20261022","status":"publish","type":"post","link":"https:\/\/quantumsea.net\/?p=1223","title":{"rendered":"pread\u306e\u4f4d\u7f6e\u6307\u5b9a\u3001\u5171\u6709\u30aa\u30d5\u30bb\u30c3\u30c8\u3092\u52d5\u304b\u3055\u305a\u306b\u30d5\u30a1\u30a4\u30eb\u3092\u8aad\u3080\u4ed5\u7d44\u307f"},"content":{"rendered":"<p>\u4e00\u3064\u306e\u5927\u304d\u306a\u30d5\u30a1\u30a4\u30eb\u3092\u3001\u8907\u6570\u306e\u51e6\u7406\u3067\u5206\u62c5\u3057\u3066\u8aad\u307f\u305f\u3044\u3068\u3057\u307e\u3059\u3002\u5404\u51e6\u7406\u304c\u300c\u8aad\u307f\u305f\u3044\u4f4d\u7f6e\u3078\u79fb\u52d5\u3057\u3066\u304b\u3089\u8aad\u3080\u300d\u3068\u3044\u3046\u4e8c\u6bb5\u968e\u3092\u4f7f\u3046\u3068\u3001\u4f4d\u7f6e\u3092\u52d5\u304b\u3057\u3066\u304b\u3089\u8aad\u3080\u307e\u3067\u306e\u9593\u306b\u3001\u5225\u306e\u51e6\u7406\u304c\u305d\u306e\u4f4d\u7f6e\u3092\u5909\u3048\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002Linux\u306e<strong>pread<\/strong>\u306f\u3001\u8aad\u307f\u53d6\u308a\u4f4d\u7f6e\u3092\u547c\u3073\u51fa\u3057\u306e\u5f15\u6570\u3068\u3057\u3066\u6e21\u3057\u3001\u5171\u6709\u306e\u30d5\u30a1\u30a4\u30eb\u30aa\u30d5\u30bb\u30c3\u30c8\u3092\u52d5\u304b\u3055\u305a\u306b\u8aad\u3080\u305f\u3081\u306e\u4ed5\u7d44\u307f\u3067\u3059\u3002<\/p>\n<section class=\"influvetor-quick-summary\" aria-label=\"\u7c21\u5358\u306b\u307e\u3068\u3081\u308b\u3068\uff1f\">\n<p><strong>\u7c21\u5358\u306b\u307e\u3068\u3081\u308b\u3068\uff1f<\/strong><\/p>\n<ul>\n<li>pread\u306f\u3001\u5148\u982d\u304b\u3089\u4f55\u30d0\u30a4\u30c8\u76ee\u3092\u8aad\u3080\u304b\u3092\u76f4\u63a5\u6307\u5b9a\u3057\u307e\u3059\u3002\u540c\u3058\u30d5\u30a1\u30a4\u30eb\u8a18\u8ff0\u5b50\u3092\u4f7f\u3046\u5225\u306e\u51e6\u7406\u304c\u5171\u6709\u4f4d\u7f6e\u3092\u52d5\u304b\u3057\u3066\u3082\u3001\u305d\u306e\u4f4d\u7f6e\u5909\u66f4\u306b\u8aad\u307f\u59cb\u3081\u3092\u5de6\u53f3\u3055\u308c\u307e\u305b\u3093\u3002<\/li>\n<li>\u4f4d\u7f6e\u3092\u6307\u5b9a\u3059\u308b\u3053\u3068\u3068\u3001\u8981\u6c42\u3057\u305f\u5168\u30d0\u30a4\u30c8\u3092\u53d6\u5f97\u3059\u308b\u3053\u3068\u306f\u5225\u3067\u3059\u3002\u77ed\u3044\u8aad\u307f\u53d6\u308a\u3067\u306f\u3001\u5b9f\u969b\u306b\u8aad\u3081\u305f\u9577\u3055\u3060\u3051\u6b21\u306e\u6307\u5b9a\u4f4d\u7f6e\u3092\u9032\u3081\u307e\u3059\u3002<\/li>\n<li>pread\u306f\u30d5\u30a1\u30a4\u30eb\u5185\u5bb9\u306e\u30b9\u30ca\u30c3\u30d7\u30b7\u30e7\u30c3\u30c8\u3084\u30ed\u30c3\u30af\u3092\u4f5c\u308a\u307e\u305b\u3093\u3002\u66f8\u304d\u63db\u3048\u3068\u306e\u6574\u5408\u6027\u306f\u5225\u306b\u8a2d\u8a08\u3057\u3001\u66f8\u304d\u8fbc\u307f\u5074\u306epwrite\u3067\u306fLinux\u306eO_APPEND\u3068\u306e\u7d44\u5408\u305b\u306b\u3082\u6ce8\u610f\u3057\u307e\u3059\u3002<\/li>\n<\/ul>\n<\/section>\n<h2>lseek\u3068read\u306e\u9593\u306b\u3042\u308b\u9699\u9593<\/h2>\n<p>\u30d5\u30a1\u30a4\u30eb\u30aa\u30d5\u30bb\u30c3\u30c8\u306f\u3001\u901a\u5e38\u30d5\u30a1\u30a4\u30eb\u306e\u300c\u6b21\u306b\u8aad\u307f\u66f8\u304d\u3059\u308b\u4f4d\u7f6e\u300d\u3067\u3059\u3002\u5148\u982d\u30920\u3068\u3059\u308b\u30d0\u30a4\u30c8\u5358\u4f4d\u306e\u4f4d\u7f6e\u3067\u3001\u30aa\u30fc\u30d7\u30f3\u30d5\u30a1\u30a4\u30eb\u8a18\u8ff0\u3068\u3044\u3046\u30ab\u30fc\u30cd\u30eb\u5074\u306e\u72b6\u614b\u306b\u4fdd\u6301\u3055\u308c\u307e\u3059\u3002\u540c\u3058\u30d5\u30a1\u30a4\u30eb\u8a18\u8ff0\u5b50\u3092\u8907\u6570\u306e\u30b9\u30ec\u30c3\u30c9\u304c\u4f7f\u3046\u5834\u5408\u3084\u3001dup\u3067\u756a\u53f7\u3092\u8907\u88fd\u3057\u305f\u5834\u5408\u3001\u3053\u306e\u4f4d\u7f6e\u3092\u5171\u6709\u3057\u307e\u3059\u3002<\/p>\n<p><code>lseek(fd, offset, SEEK_SET)<\/code>\u306f\u4f4d\u7f6e\u3092\u5148\u982d\u304b\u3089offset\u30d0\u30a4\u30c8\u76ee\u3078\u79fb\u3057\u3001\u305d\u306e\u5f8c\u306e<code>read()<\/code>\u306f\u5171\u6709\u4f4d\u7f6e\u304b\u3089\u8aad\u307f\u307e\u3059\u3002\u3053\u306e\u4e8c\u3064\u306f\u5225\u306e\u547c\u3073\u51fa\u3057\u3067\u3059\u3002\u51e6\u7406A\u304c\u4f4d\u7f6e\u30920\u3078\u623b\u3057\u305f\u76f4\u5f8c\u3001\u51e6\u7406B\u304c\u4f4d\u7f6e\u30924\u3078\u79fb\u3059\u3068\u3001A\u306eread\u30824\u304b\u3089\u8aad\u307f\u59cb\u3081\u5f97\u307e\u3059\u3002\u500b\u3005\u306e\u547c\u3073\u51fa\u3057\u304c\u6b63\u5e38\u306b\u7d42\u308f\u3063\u3066\u3082\u3001A\u306e\u610f\u56f3\u3057\u305f\u4e00\u9023\u306e\u64cd\u4f5c\u306b\u306f\u306a\u308a\u307e\u305b\u3093\u3002<\/p>\n<p>\u5185\u5bb9\u304c<code>ABCDEFGH<\/code>\u3067\u3001A\u304c\u5148\u982d2\u30d0\u30a4\u30c8\u306eAB\u3001B\u304c\u4f4d\u7f6e4\u304b\u30892\u30d0\u30a4\u30c8\u306eEF\u3092\u8aad\u307f\u305f\u3044\u5834\u5408\u3092\u8003\u3048\u307e\u3059\u3002A\u306elseek\u3001B\u306elseek\u3001A\u306eread\u3001B\u306eread\u306e\u9806\u306b\u52d5\u304d\u3001\u5404read\u304c2\u30d0\u30a4\u30c8\u3092\u8fd4\u305b\u3070\u3001A\u306b\u306fEF\u3001B\u306b\u306fGH\u304c\u6e21\u308a\u307e\u3059\u3002\u554f\u984c\u306f\u30d5\u30a1\u30a4\u30eb\u306e\u4e2d\u8eab\u3067\u306f\u306a\u304f\u3001\u8aad\u307f\u59cb\u3081\u3092\u6c7a\u3081\u308b\u5171\u6709\u72b6\u614b\u306e\u53d6\u308a\u5408\u3044\u306b\u3042\u308a\u307e\u3059\u3002[1\u30012]<\/p>\n<h2>\u8aad\u307f\u59cb\u3081\u3092\u5f15\u6570\u3067\u6e21\u3059pread<\/h2>\n<p><code>pread(fd, buf, count, offset)<\/code>\u306f\u3001offset\u3067\u6307\u5b9a\u3057\u305f\u4f4d\u7f6e\u304b\u3089\u6700\u5927count\u30d0\u30a4\u30c8\u3092buf\u3078\u8aad\u307f\u307e\u3059\u3002\u3053\u306e\u547c\u3073\u51fa\u3057\u306b\u3088\u3063\u3066\u5171\u6709\u306e\u30d5\u30a1\u30a4\u30eb\u30aa\u30d5\u30bb\u30c3\u30c8\u306f\u5909\u308f\u308a\u307e\u305b\u3093\u3002A\u304coffset\u30920\u3001B\u304c4\u3068\u3057\u3066\u547c\u3079\u3070\u3001\u5148\u307b\u3069\u306e\u5171\u6709\u4f4d\u7f6e\u5909\u66f4\u306e\u9699\u9593\u3092\u4f7f\u308f\u305a\u306b\u3001\u305d\u308c\u305e\u308c\u306e\u8aad\u307f\u59cb\u3081\u3092\u6307\u5b9a\u3067\u304d\u307e\u3059\u3002[1]<\/p>\n<figure><img decoding=\"async\" src=\"https:\/\/quantumsea.net\/wp-content\/uploads\/2026\/10\/qs-pread-offset-concurrency-20261022-figure-bb49bf16d0d4.png\" alt=\"8\u30d0\u30a4\u30c8\u306eABCDEFGH\u3092\u8aad\u3080\u8aac\u660e\u30e2\u30c7\u30eb\u3002lseek\u3092\u631f\u3093\u3060\u9806\u5e8f\u3067\u306fA\u304cEF\u3001B\u304cGH\u3092\u53d6\u5f97\u3002pread\u3067\u306f\u4f4d\u7f6e0\u306eA\u304cAB\u3001\u4f4d\u7f6e4\u306eB\u304cEF\u3092\u53d6\u5f97\u3057\u3001\u5171\u6709\u4f4d\u7f6e\u306f\u5909\u308f\u3089\u306a\u3044\u3002\" style=\"display:block;width:100%;max-width:100%;height:auto\"\/><figcaption>\u5404\u56de2\u30d0\u30a4\u30c8\u3092\u8aad\u3081\u3001\u5185\u5bb9\u304c\u5909\u5316\u3057\u306a\u3044\u5834\u5408\u306e\u72ec\u81ea\u30e2\u30c7\u30eb\u3002\u4e0a\u6bb5\u306f\u4e00\u3064\u306e\u4ecb\u5165\u9806\u5e8f\u306e\u4f8b\u3001\u4e0b\u6bb5\u306f\u547c\u3073\u51fa\u3057\u3054\u3068\u306b\u6307\u5b9a\u3057\u305f\u4f4d\u7f6e\u3067\u3059\u3002<\/figcaption><\/figure>\n<p>\u4f8b\u3048\u3070\u3001\u5148\u982d\u306b\u30d8\u30c3\u30c0\u30fc\u3001\u4f4d\u7f6e\u3092\u8a08\u7b97\u3067\u304d\u308b\u5834\u6240\u306b\u56fa\u5b9a\u9577\u30ec\u30b3\u30fc\u30c9\u304c\u3042\u308b\u30d5\u30a1\u30a4\u30eb\u306a\u3089\u3001\u30ec\u30b3\u30fc\u30c9\u756a\u53f7\u304b\u3089\u30d0\u30a4\u30c8\u4f4d\u7f6e\u3092\u8a08\u7b97\u3057\u3066\u8aad\u3080\u8a2d\u8a08\u306b\u5411\u304d\u307e\u3059\u3002\u9806\u756a\u3069\u304a\u308a\u306b\u8aad\u3093\u3067\u3044\u308b\u51e6\u7406\u304c\u3042\u3063\u3066\u3082\u3001pread\u305d\u306e\u3082\u306e\u306f\u305d\u306e\u5171\u6709\u4f4d\u7f6e\u3092\u9032\u3081\u306a\u3044\u305f\u3081\u3001\u4f4d\u7f6e\u306e\u66f4\u65b0\u3092\u907f\u3051\u305f\u53c2\u7167\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u305f\u3060\u3057\u3001\u3059\u3079\u3066\u306e\u5165\u51fa\u529b\u5148\u306b\u4f7f\u3048\u308b\u308f\u3051\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u5bfe\u8c61\u306f\u4f4d\u7f6e\u3092\u6307\u5b9a\u3067\u304d\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u901a\u5e38\u306e\u30d5\u30a1\u30a4\u30eb\u3068\u9055\u3044\u3001\u30d1\u30a4\u30d7\u3084\u30bd\u30b1\u30c3\u30c8\u306b\u306f\u300c\u5148\u982d\u304b\u3089100\u30d0\u30a4\u30c8\u76ee\u3078\u79fb\u52d5\u3059\u308b\u300d\u3068\u3044\u3046\u64cd\u4f5c\u306f\u3067\u304d\u307e\u305b\u3093\u3002\u540d\u524d\u306bread\u304c\u5165\u3063\u3066\u3044\u3066\u3082\u3001\u30d0\u30a4\u30c8\u306e\u6d41\u308c\u304b\u3089\u6b21\u306e\u30c7\u30fc\u30bf\u3092\u8aad\u3080read\u306e\u5b8c\u5168\u306a\u4ee3\u7528\u54c1\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n<h2>\u77ed\u304f\u8aad\u3081\u305f\u3068\u304d\u306f\u3001\u5b9f\u969b\u306e\u9577\u3055\u3060\u3051\u9032\u3081\u308b<\/h2>\n<p>pread\u306ecount\u306f\u6700\u5927\u306e\u8981\u6c42\u91cf\u3067\u3059\u3002\u6210\u529f\u3057\u3066\u3082\u3001\u305d\u308c\u3088\u308a\u5c11\u306a\u3044\u30d0\u30a4\u30c8\u6570\u304c\u8fd4\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002\u623b\u308a\u5024\u304c\u6b63\u306a\u3089\u5b9f\u969b\u306b\u8aad\u3081\u305f\u30d0\u30a4\u30c8\u6570\u30010\u306a\u3089\u7d42\u7aef\u3001\u5931\u6557\u306a\u3089\u22121\u3068\u30a8\u30e9\u30fc\u60c5\u5831\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002\u4f4d\u7f6e\u3092\u76f4\u63a5\u6307\u5b9a\u3057\u305f\u3053\u3068\u3092\u3001\u5168\u91cf\u53d6\u5f97\u306e\u4fdd\u8a3c\u306b\u8aad\u307f\u66ff\u3048\u306a\u3044\u3053\u3068\u304c\u5927\u5207\u3067\u3059\u3002[1\u3001RETURN VALUE]<\/p>\n<p>\u4f4d\u7f6e100\u304b\u3089\u5408\u8a088\u30d0\u30a4\u30c8\u304c\u5fc5\u8981\u3067\u3001\u6700\u521d\u306b3\u30d0\u30a4\u30c8\u3092\u53d6\u5f97\u3057\u305f\u3068\u3057\u307e\u3059\u3002\u6b8b\u308a\u3092\u8aad\u3080\u306a\u3089\u3001\u6b21\u306e\u6307\u5b9a\u4f4d\u7f6e\u306f103\u3001\u6b8b\u308a\u306e\u8981\u6c42\u91cf\u306f5\u3067\u3059\u3002\u3082\u3046\u4e00\u5ea6\u4f4d\u7f6e100\u3092\u6307\u5b9a\u3059\u308b\u3068\u5148\u982d\u5074\u3092\u8aad\u307f\u76f4\u3057\u30018\u9032\u3081\u3066108\u304b\u3089\u8aad\u3080\u3068\u672a\u53d6\u5f97\u306e5\u30d0\u30a4\u30c8\u3092\u98db\u3070\u3057\u307e\u3059\u3002\u77ed\u3044\u8aad\u307f\u53d6\u308a\u3092\u7e70\u308a\u8fd4\u3059\u51e6\u7406\u3067\u306f\u3001\u30d0\u30c3\u30d5\u30a1\u306e\u66f8\u8fbc\u307f\u4f4d\u7f6e\u3082\u540c\u3058\u5b9f\u53d6\u5f97\u91cf\u3060\u3051\u9032\u3081\u307e\u3059\u3002<\/p>\n<p>\u7d42\u7aef\u306b\u9054\u3057\u305f\u306e\u306b\u5fc5\u8981\u91cf\u304c\u305d\u308d\u308f\u306a\u3044\u5834\u5408\u306f\u3001\u5f62\u5f0f\u4e0a\u306e\u4e0d\u8db3\u3068\u3057\u3066\u6271\u3046\u306e\u304b\u3001\u30d5\u30a1\u30a4\u30eb\u306e\u6210\u9577\u3092\u5f85\u3064\u306e\u304b\u3092\u7528\u9014\u306b\u5408\u308f\u305b\u3066\u6c7a\u3081\u307e\u3059\u3002\u623b\u308a\u5024\u304c0\u306e\u307e\u307e\u540c\u3058\u51e6\u7406\u3092\u7121\u6761\u4ef6\u306b\u7e70\u308a\u8fd4\u3057\u3066\u3082\u3001\u5fc5\u8981\u306a\u30c7\u30fc\u30bf\u304c\u5f97\u3089\u308c\u308b\u4fdd\u8a3c\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u30a8\u30e9\u30fc\u306e\u6271\u3044\u3068\u3001\u3069\u3053\u307e\u3067\u3092\u4e00\u3064\u306e\u8aad\u53d6\u308a\u5358\u4f4d\u3068\u3057\u3066\u5b8c\u6210\u3068\u3059\u308b\u304b\u3092\u7d44\u307f\u5408\u308f\u305b\u3066\u8003\u3048\u307e\u3059\u3002<\/p>\n<h2>\u4f4d\u7f6e\u304c\u5b89\u5b9a\u3057\u3066\u3082\u3001\u4e2d\u8eab\u306f\u56fa\u5b9a\u3055\u308c\u306a\u3044<\/h2>\n<p>pread\u304c\u53d6\u308a\u9664\u304f\u306e\u306f\u3001\u5171\u6709\u30aa\u30d5\u30bb\u30c3\u30c8\u306e\u79fb\u52d5\u306b\u3088\u3063\u3066\u8aad\u53d6\u308a\u958b\u59cb\u4f4d\u7f6e\u304c\u305a\u308c\u308b\u554f\u984c\u3067\u3059\u3002\u5225\u306e\u51e6\u7406\u304c\u30d5\u30a1\u30a4\u30eb\u3092\u66f8\u304d\u63db\u3048\u308b\u3053\u3068\u3001\u5207\u308a\u8a70\u3081\u308b\u3053\u3068\u3001\u8907\u6570\u306e\u8aad\u307f\u53d6\u308a\u306e\u9593\u306b\u5185\u5bb9\u306e\u7248\u304c\u5909\u308f\u308b\u3053\u3068\u307e\u3067\u306f\u9632\u304e\u307e\u305b\u3093\u3002<\/p>\n<p>\u305f\u3068\u3048\u3070\u3001\u30d8\u30c3\u30c0\u30fc\u3092\u4e00\u56de\u76ee\u3001\u672c\u6587\u3092\u4e8c\u56de\u76ee\u306epread\u3067\u8aad\u3080\u9593\u306b\u66f4\u65b0\u304c\u5165\u308b\u3068\u3001\u4e8c\u3064\u306e\u8aad\u53d6\u308a\u304c\u540c\u3058\u7248\u3092\u898b\u305f\u3068\u306f\u3001\u3053\u306e\u4ed5\u7d44\u307f\u3060\u3051\u3067\u306f\u5224\u65ad\u3067\u304d\u307e\u305b\u3093\u3002\u5909\u66f4\u3055\u308c\u306a\u3044\u30d5\u30a1\u30a4\u30eb\u3092\u8aad\u3080\u8a2d\u8a08\u3001\u95a2\u4fc2\u3059\u308b\u66f8\u304d\u624b\u3082\u5f93\u3046\u30ed\u30c3\u30af\u3001\u7248\u756a\u53f7\u306e\u691c\u8a3c\u306a\u3069\u3001\u5185\u5bb9\u306e\u4e00\u8cab\u6027\u3092\u78ba\u4fdd\u3059\u308b\u65b9\u6cd5\u304c\u5225\u306b\u5fc5\u8981\u306b\u306a\u308a\u307e\u3059\u3002\u5358\u306b\u4e8c\u3064\u306e\u4f4d\u7f6e\u3092\u6b63\u3057\u304f\u6307\u5b9a\u3067\u304d\u305f\u3001\u3068\u3044\u3046\u4e8b\u5b9f\u3068\u5206\u3051\u3066\u6271\u3044\u307e\u3059\u3002<\/p>\n<p>\u307e\u305f\u3001pread\u304c\u8907\u6570\u30b9\u30ec\u30c3\u30c9\u306e\u4f4d\u7f6e\u6307\u5b9a\u306b\u4fbf\u5229\u3067\u3042\u308b\u3053\u3068\u306f\u3001\u5fc5\u305a\u9ad8\u901f\u306b\u306a\u308b\u3068\u3044\u3046\u610f\u5473\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u30b9\u30c8\u30ec\u30fc\u30b8\u3001\u30ad\u30e3\u30c3\u30b7\u30e5\u3001\u30a2\u30af\u30bb\u30b9\u306e\u5c40\u6240\u6027\u3001\u51e6\u7406\u5358\u4f4d\u306b\u3088\u3063\u3066\u901f\u5ea6\u306f\u5909\u308f\u308a\u307e\u3059\u3002\u4eca\u56de\u306e\u56f3\u306f\u547c\u3073\u51fa\u3057\u306e\u610f\u5473\u3092\u78ba\u304b\u3081\u308b\u30e2\u30c7\u30eb\u3067\u3001Linux\u30ab\u30fc\u30cd\u30eb\u3084\u30b9\u30c8\u30ec\u30fc\u30b8\u306e\u6027\u80fd\u6e2c\u5b9a\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n<h2>pwrite\u3068\u8ffd\u8a18\u30e2\u30fc\u30c9\u3092\u7d44\u307f\u5408\u308f\u305b\u308b\u524d\u306b<\/h2>\n<p>\u66f8\u304d\u8fbc\u307f\u5074\u306e\u5bfe\u5fdc\u3059\u308b\u64cd\u4f5c\u306f<code>pwrite()<\/code>\u3067\u3059\u3002\u6307\u5b9a\u4f4d\u7f6e\u3078\u6700\u5927count\u30d0\u30a4\u30c8\u3092\u66f8\u304d\u8fbc\u307f\u3001\u5171\u6709\u30aa\u30d5\u30bb\u30c3\u30c8\u306f\u5909\u66f4\u3057\u306a\u3044\u3001\u3068\u3044\u3046\u5f79\u5272\u3092\u6301\u3061\u307e\u3059\u3002\u3053\u3061\u3089\u3082\u623b\u308a\u5024\u306f\u5b9f\u969b\u306e\u66f8\u8fbc\u307f\u91cf\u3067\u3042\u308a\u3001\u4e00\u56de\u3067\u8981\u6c42\u91cf\u304c\u5b8c\u4e86\u3059\u308b\u3068\u306f\u9650\u308a\u307e\u305b\u3093\u3002[1]<\/p>\n<p>\u7279\u306bLinux man-pages 6.19\u306f\u3001<code>O_APPEND<\/code>\u3067\u958b\u3044\u305f\u30d5\u30a1\u30a4\u30eb\u3078\u306epwrite\u306b\u4ed5\u69d8\u4e0a\u306e\u6ce8\u610f\u70b9\u3092\u8a18\u3057\u3066\u3044\u307e\u3059\u3002POSIX\u3067\u306fO_APPEND\u304cpwrite\u306e\u66f8\u8fbc\u307f\u4f4d\u7f6e\u306b\u5f71\u97ff\u3057\u306a\u3044\u3053\u3068\u3092\u6c42\u3081\u308b\u4e00\u65b9\u3001\u540c\u30de\u30cb\u30e5\u30a2\u30eb\u304c\u8aac\u660e\u3059\u308bLinux\u306e\u6319\u52d5\u3067\u306f\u3001offset\u306e\u5024\u306b\u3088\u3089\u305a\u30d5\u30a1\u30a4\u30eb\u672b\u5c3e\u3078\u8ffd\u8a18\u3057\u307e\u3059\u3002\u6307\u5b9a\u4f4d\u7f6e\u3078\u66f4\u65b0\u3059\u308b\u3064\u3082\u308a\u3067\u8ffd\u8a18\u7528\u306e\u8a18\u8ff0\u5b50\u3092\u4f7f\u308f\u306a\u3044\u3088\u3046\u3001\u958b\u304f\u3068\u304d\u306e\u30d5\u30e9\u30b0\u307e\u3067\u78ba\u8a8d\u3057\u307e\u3059\u3002[1\u3001BUGS]<\/p>\n<p>\u5206\u62c5\u8aad\u53d6\u308a\u3092\u8a2d\u8a08\u3059\u308b\u306a\u3089\u3001\u307e\u305a\u5171\u6709\u4f4d\u7f6e\u3092\u4f7f\u3046\u5fc5\u8981\u304c\u3042\u308b\u304b\u3001\u4f4d\u7f6e\u3092\u547c\u3073\u51fa\u3057\u3054\u3068\u306b\u6307\u5b9a\u3067\u304d\u308b\u304b\u3092\u6c7a\u3081\u307e\u3059\u3002\u305d\u306e\u3046\u3048\u3067\u3001\u77ed\u3044\u8aad\u53d6\u308a\u306e\u7d9a\u304d\u3001\u7d42\u7aef\u3068\u30a8\u30e9\u30fc\u3001\u66f4\u65b0\u4e2d\u306e\u5185\u5bb9\u306e\u4e00\u8cab\u6027\u3092\u5225\u3005\u306b\u70b9\u691c\u3057\u307e\u3059\u3002pread\u306f\u305d\u306e\u3046\u3061\u300c\u3069\u3053\u304b\u3089\u8aad\u3080\u304b\u300d\u3092\u660e\u78ba\u306b\u3059\u308b\u9053\u5177\u3067\u3059\u3002<\/p>\n<h2>\u51fa\u5178\u30fb\u53c2\u8003\u8cc7\u6599<\/h2>\n<ul>\n<li>[1] <a href=\"https:\/\/man7.org\/linux\/man-pages\/man2\/pread.2.html\">Linux man-pages 6.19 \u2014 pread(2), pwrite(2)<\/a>\uff1aDESCRIPTION\u3001RETURN VALUE\u3001NOTES\u3001BUGS\u30022026\u5e742\u67088\u65e5\u8868\u8a18\u30012026\u5e7410\u670822\u65e5\u53d6\u5f97\u3002<\/li>\n<li>[2] <a href=\"https:\/\/man7.org\/linux\/man-pages\/man2\/lseek.2.html\">Linux man-pages 6.19 \u2014 lseek(2)<\/a>\uff1a\u30d5\u30a1\u30a4\u30eb\u30aa\u30d5\u30bb\u30c3\u30c8\u3068SEEK_SET\u3001\u4f4d\u7f6e\u6307\u5b9a\u3067\u304d\u306a\u3044\u5bfe\u8c61\u3002\u4e26\u884c\u9806\u5e8f\u3068\u77ed\u3044\u8aad\u53d6\u308a\u306e\u6570\u5024\u4f8b\u306f\u72ec\u81ea\u306e\u8aac\u660e\u30e2\u30c7\u30eb\u3067\u3059\u3002<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>\u4e00\u3064\u306e\u5927\u304d\u306a\u30d5\u30a1\u30a4\u30eb\u3092\u3001\u8907\u6570\u306e\u51e6\u7406\u3067\u5206\u62c5\u3057\u3066\u8aad\u307f\u305f\u3044\u3068\u3057\u307e\u3059\u3002\u5404\u51e6\u7406\u304c\u300c\u8aad\u307f\u305f\u3044\u4f4d\u7f6e\u3078\u79fb\u52d5\u3057\u3066\u304b\u3089\u8aad\u3080\u300d\u3068\u3044\u3046\u4e8c\u6bb5\u968e\u3092\u4f7f\u3046\u3068\u3001\u4f4d\u7f6e\u3092\u52d5\u304b\u3057\u3066\u304b\u3089\u8aad\u3080\u307e\u3067\u306e\u9593\u306b\u3001\u5225\u306e\u51e6\u7406\u304c\u305d\u306e\u4f4d\u7f6e\u3092\u5909\u3048\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002Linux\u306epre [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":1221,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":true,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":false,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[30],"tags":[244],"class_list":["post-1223","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-computing","tag-linux"],"jetpack_publicize_connections":[],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"https:\/\/quantumsea.net\/wp-content\/uploads\/2026\/10\/qs-pread-offset-concurrency-20261022-featured-7c45d7b96ab1.png","_links":{"self":[{"href":"https:\/\/quantumsea.net\/index.php?rest_route=\/wp\/v2\/posts\/1223","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/quantumsea.net\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/quantumsea.net\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/quantumsea.net\/index.php?rest_route=\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/quantumsea.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1223"}],"version-history":[{"count":1,"href":"https:\/\/quantumsea.net\/index.php?rest_route=\/wp\/v2\/posts\/1223\/revisions"}],"predecessor-version":[{"id":1226,"href":"https:\/\/quantumsea.net\/index.php?rest_route=\/wp\/v2\/posts\/1223\/revisions\/1226"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/quantumsea.net\/index.php?rest_route=\/wp\/v2\/media\/1221"}],"wp:attachment":[{"href":"https:\/\/quantumsea.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1223"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/quantumsea.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1223"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/quantumsea.net\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1223"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}