{"id":1385,"date":"2026-10-25T20:00:00","date_gmt":"2026-10-25T11:00:00","guid":{"rendered":"https:\/\/quantumsea.net\/?p=1385"},"modified":"2026-10-23T06:25:47","modified_gmt":"2026-10-22T21:25:47","slug":"qs-readlink-byte-count-truncation-20261023","status":"publish","type":"post","link":"https:\/\/quantumsea.net\/?p=1385","title":{"rendered":"readlink\u306e\u623b\u308a\u5024\u3001\u6210\u529f\u3057\u3066\u3082\u30ea\u30f3\u30af\u5148\u3092\u5168\u90e8\u8aad\u3081\u305f\u3068\u306f\u9650\u3089\u306a\u3044"},"content":{"rendered":"<p>\u30b7\u30f3\u30dc\u30ea\u30c3\u30af\u30ea\u30f3\u30af\u306e\u4e2d\u306b\u8a18\u9332\u3055\u308c\u305f\u540d\u524d\u3092\u8aad\u3080readlink\u306f\u3001\u547c\u3073\u51fa\u3057\u304c\u6210\u529f\u3057\u3066\u3082\u3001\u305d\u306e\u540d\u524d\u3092\u5168\u90e8\u53d7\u3051\u53d6\u308c\u305f\u3068\u306f\u9650\u308a\u307e\u305b\u3093\u3002\u3055\u3089\u306b\u3001\u7d50\u679c\u306e\u672b\u5c3e\u3078C\u8a00\u8a9e\u306e\u6587\u5b57\u5217\u3092\u7d42\u3048\u308b\u30bc\u30ed\u30d0\u30a4\u30c8\u3092\u4ed8\u3051\u3066\u304f\u308c\u308b\u308f\u3051\u3067\u3082\u3042\u308a\u307e\u305b\u3093\u3002\u8fd4\u3055\u308c\u305f\u30d0\u30a4\u30c8\u6570\u3068\u3001\u6e21\u3057\u305f\u9818\u57df\u306e\u5927\u304d\u3055\u3092\u3069\u3046\u6bd4\u3079\u308b\u304b\u304c\u3001\u8aad\u307f\u53d6\u3063\u305f\u5185\u5bb9\u3092\u6b63\u3057\u304f\u6271\u3046\u9375\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<section class=\"influvetor-quick-summary\">\n<p><strong>\u7c21\u5358\u306b\u307e\u3068\u3081\u308b\u3068\uff1f<\/strong><\/p>\n<ul>\n<li>readlink\u306f\u30ea\u30f3\u30af\u306b\u8a18\u9332\u3055\u308c\u305f\u5185\u5bb9\u3092\u30d0\u30c3\u30d5\u30a1\u3078\u30b3\u30d4\u30fc\u3057\u3001\u66f8\u304d\u8fbc\u3093\u3060\u30d0\u30a4\u30c8\u6570\u3092\u8fd4\u3057\u307e\u3059\u3002\u6210\u529f\u6642\u3082\u672b\u5c3e\u306eNUL\u306f\u8ffd\u52a0\u3057\u307e\u305b\u3093\u3002<\/li>\n<li>\u623b\u308a\u5024\u304c\u30d0\u30c3\u30d5\u30a1\u5bb9\u91cf\u3088\u308a\u5c0f\u3055\u3051\u308c\u3070\u3001\u305d\u306e\u547c\u3073\u51fa\u3057\u3067\u306f\u5185\u5bb9\u304c\u53ce\u307e\u3063\u3066\u3044\u307e\u3059\u3002\u5bb9\u91cf\u3068\u540c\u3058\u306a\u3089\u3001\u3074\u3063\u305f\u308a\u53ce\u307e\u3063\u305f\u5834\u5408\u3068\u9014\u4e2d\u3067\u5207\u308c\u305f\u5834\u5408\u3092\u533a\u5225\u3067\u304d\u307e\u305b\u3093\u3002<\/li>\n<li>lstat\u3067\u5148\u306b\u5927\u304d\u3055\u3092\u8abf\u3079\u3066\u3082\u3001\u8aad\u307f\u53d6\u308a\u307e\u3067\u306b\u30ea\u30f3\u30af\u304c\u5909\u308f\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u898b\u7a4d\u3082\u308a\u3060\u3051\u306b\u983c\u3089\u305a\u3001\u5b9f\u969b\u306e\u623b\u308a\u5024\u3068\u518d\u8a66\u884c\u306e\u4e0a\u9650\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002<\/li>\n<\/ul>\n<\/section>\n<h2>\u6587\u5b57\u5217\u3092\u8fd4\u3059\u306e\u3067\u306f\u306a\u304f\u3001\u30d0\u30a4\u30c8\u5217\u3092\u9818\u57df\u3078\u66f8\u304d\u8fbc\u3080<\/h2>\n<p>readlink(path, buf, bufsiz)\u306f\u3001path\u3067\u6307\u5b9a\u3057\u305f\u30b7\u30f3\u30dc\u30ea\u30c3\u30af\u30ea\u30f3\u30af\u306e\u5185\u5bb9\u3092\u3001buf\u304c\u6307\u3059\u9818\u57df\u3078\u6700\u5927bufsiz\u30d0\u30a4\u30c8\u66f8\u304d\u8fbc\u307f\u307e\u3059\u3002Linux man-pages\u306ereadlink(2)\u306f\u3001\u6210\u529f\u3057\u305f\u3068\u304d\u306e\u623b\u308a\u5024\u3092\u3001\u5b9f\u969b\u306b\u66f8\u304d\u8fbc\u3093\u3060\u30d0\u30a4\u30c8\u6570\u3068\u5b9a\u7fa9\u3057\u3066\u3044\u307e\u3059\u3002\u5931\u6557\u6642\u306f\u22121\u3092\u8fd4\u3057\u3001errno\u306b\u7406\u7531\u3092\u8a2d\u5b9a\u3057\u307e\u3059\u3002[1\u3001DESCRIPTION\u3001RETURN VALUE]<\/p>\n<p>\u3053\u3053\u3067\u8aad\u3080\u306e\u306f\u30ea\u30f3\u30af\u306e\u5185\u5bb9\u3067\u3059\u3002\u30ea\u30f3\u30af\u5148\u306e\u30d5\u30a1\u30a4\u30eb\u672c\u4f53\u3092\u958b\u3044\u3066\u4e2d\u8eab\u3092\u8aad\u3080\u64cd\u4f5c\u3084\u3001\u3059\u3079\u3066\u306e\u5225\u540d\u3092\u89e3\u6c7a\u3057\u305f\u7d76\u5bfe\u30d1\u30b9\u306e\u751f\u6210\u3068\u6df7\u540c\u3057\u306a\u3044\u3053\u3068\u304c\u5927\u5207\u3067\u3059\u3002\u76f8\u5bfe\u7684\u306a\u540d\u524d\u304c\u8a18\u9332\u3055\u308c\u3066\u3044\u308b\u306a\u3089\u3001\u305d\u306e\u540d\u524d\u306e\u6587\u5b57\u5217\u304c\u7d50\u679c\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>C\u8a00\u8a9e\u3067\u306f\u6587\u5b57\u5217\u306e\u7d42\u308f\u308a\u3092NUL\u3001\u5024\u304c0\u306e\u30d0\u30a4\u30c8\u3067\u793a\u3059\u3053\u3068\u304c\u591a\u304f\u3042\u308a\u307e\u3059\u3002\u3057\u304b\u3057readlink\u306f\u3001\u305d\u306e\u7d42\u7aef\u3092\u8ffd\u52a0\u3057\u307e\u305b\u3093\u3002\u53d7\u3051\u53d6\u3063\u305f\u9818\u57df\u3092\u305d\u306e\u307e\u307e\u7d42\u7aef\u4ed8\u304d\u6587\u5b57\u5217\u3068\u3057\u3066\u6271\u3046\u3068\u3001\u66f8\u304d\u8fbc\u307e\u308c\u305f\u7bc4\u56f2\u3092\u8d8a\u3048\u3066\u8aad\u307f\u9032\u3081\u308b\u304a\u305d\u308c\u304c\u3042\u308a\u307e\u3059\u3002\u307e\u305a\u300c\u6709\u52b9\u306a\u30c7\u30fc\u30bf\u306f\u5148\u982d\u304b\u3089\u4f55\u30d0\u30a4\u30c8\u304b\u300d\u3092\u623b\u308a\u5024\u3067\u7ba1\u7406\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<h2>\u623b\u308a\u5024\u304c\u5bb9\u91cf\u3068\u7b49\u3057\u3044\u3068\u304d\u306f\u3001\u4e8c\u3064\u306e\u53ef\u80fd\u6027\u304c\u6b8b\u308b<\/h2>\n<p>\u30ea\u30f3\u30af\u306b\u8a18\u9332\u3055\u308c\u3066\u3044\u308b\u5185\u5bb9\u3092\u3001ASCII\u30679\u30d0\u30a4\u30c8\u306edocs\/v1\/a\u3068\u3057\u307e\u3059\u30028\u30d0\u30a4\u30c8\u306e\u9818\u57df\u3092\u6e21\u3059\u3068\u3001\u5148\u982d8\u30d0\u30a4\u30c8\u306edocs\/v1\/\u3060\u3051\u304c\u5165\u308a\u3001\u623b\u308a\u5024\u306f8\u3067\u3059\u3002\u5c0f\u3055\u3044\u9818\u57df\u306b\u5408\u308f\u305b\u3066\u5185\u5bb9\u304c\u5207\u308a\u8a70\u3081\u3089\u308c\u307e\u3059\u304c\u3001\u305d\u308c\u3060\u3051\u3067\u30a8\u30e9\u30fc\u306b\u306a\u308b\u308f\u3051\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002[1\u3001DESCRIPTION]<\/p>\n<p>\u540c\u3058\u30ea\u30f3\u30af\u306b9\u30d0\u30a4\u30c8\u306e\u9818\u57df\u3092\u6e21\u3059\u3068\u3001docs\/v1\/a\u306e\u51689\u30d0\u30a4\u30c8\u304c\u5165\u308a\u3001\u623b\u308a\u5024\u306f9\u306b\u306a\u308a\u307e\u3059\u3002\u3053\u306e\u5834\u5408\u306f\u5168\u90e8\u5165\u3063\u3066\u3044\u307e\u3059\u304c\u3001\u547c\u3073\u51fa\u3057\u305f\u5074\u304c\u5143\u306e\u9577\u3055\u3092\u77e5\u3089\u306a\u3044\u306a\u3089\u3001\u623b\u308a\u5024\u3060\u3051\u3067\u305d\u308c\u3092\u78ba\u8a8d\u3067\u304d\u307e\u305b\u3093\u300210\u30d0\u30a4\u30c8\u4ee5\u4e0a\u306e\u5185\u5bb9\u304c\u9014\u4e2d\u3067\u5207\u3089\u308c\u305f\u5834\u5408\u3082\u30019\u30d0\u30a4\u30c8\u306e\u9818\u57df\u306b\u5bfe\u3059\u308b\u623b\u308a\u5024\u306f9\u306b\u306a\u308a\u5f97\u308b\u305f\u3081\u3067\u3059\u3002<\/p>\n<p>10\u30d0\u30a4\u30c8\u306e\u9818\u57df\u306a\u3089\u3001\u623b\u308a\u50249\u306f\u5bb9\u91cf10\u3088\u308a\u5c0f\u3055\u304f\u306a\u308a\u307e\u3059\u3002\u3053\u306e\u6bd4\u8f03\u304b\u3089\u3001\u305d\u306e\u547c\u3073\u51fa\u3057\u3067\u5185\u5bb9\u304c\u53ce\u307e\u3063\u305f\u3068\u5224\u65ad\u3067\u304d\u307e\u3059\u3002\u305f\u3060\u3057\u3001\u4f59\u3063\u305f\u6700\u5f8c\u306e1\u30d0\u30a4\u30c8\u3078NUL\u304c\u81ea\u52d5\u3067\u66f8\u304b\u308c\u308b\u308f\u3051\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u5185\u5bb9\u304c\u53ce\u307e\u308b\u3053\u3068\u3068\u3001\u7d42\u7aef\u304c\u4ed8\u304f\u3053\u3068\u306f\u5225\u3067\u3059\u3002<\/p>\n<figure><img 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