{"id":1207,"date":"2026-10-24T00:00:00","date_gmt":"2026-10-23T15:00:00","guid":{"rendered":"https:\/\/quantumsea.net\/?p=1207"},"modified":"2026-10-22T20:25:25","modified_gmt":"2026-10-22T11:25:25","slug":"qs-linux-pipe-buf-write-atomicity-20261022","status":"publish","type":"post","link":"https:\/\/quantumsea.net\/?p=1207","title":{"rendered":"PIPE_BUF\u306e\u539f\u5b50\u7684\u66f8\u304d\u8fbc\u307f\u3001\u4e00\u56de\u66f8\u3044\u305f\u30c7\u30fc\u30bf\u3092\u4e00\u56de\u3067\u8aad\u3081\u308b\u3068\u306f\u9650\u3089\u306a\u3044"},"content":{"rendered":"<p>\u8907\u6570\u306e\u51e6\u7406\u304c\u540c\u3058\u30d1\u30a4\u30d7\u3078\u30ed\u30b0\u3092\u9001\u308a\u3001\u4e00\u3064\u306e\u51e6\u7406\u304c\u307e\u3068\u3081\u3066\u8aad\u307f\u53d6\u308b\u3002\u305d\u306e\u3068\u304d\u3001\u3042\u308b\u66f8\u304d\u624b\u306e\u4e00\u884c\u306e\u9014\u4e2d\u3078\u3001\u5225\u306e\u66f8\u304d\u624b\u306e\u6587\u5b57\u304c\u5165\u308a\u8fbc\u3080\u3068\u3001\u53d7\u4fe1\u5074\u306f\u8a18\u9332\u3092\u6b63\u3057\u304f\u89e3\u91c8\u3067\u304d\u307e\u305b\u3093\u3002Linux\u306e\u30d1\u30a4\u30d7\u306b\u306f\u3001\u5c0f\u3055\u306a\u66f8\u304d\u8fbc\u307f\u3092\u4ed6\u306e\u66f8\u304d\u8fbc\u307f\u3068\u6df7\u305c\u306a\u3044\u305f\u3081\u306e\u4e0a\u9650\u3001<strong>PIPE_BUF<\/strong>\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u305f\u3060\u3057\u3001\u3053\u306e\u4fdd\u8a3c\u306f\u300c\u4e00\u56de\u306ewrite\u306b\u5bfe\u5fdc\u3057\u3066\u3001\u4e00\u56de\u306eread\u304c\u8fd4\u308b\u300d\u3068\u3044\u3046\u610f\u5473\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u66f8\u304d\u8fbc\u307f\u540c\u58eb\u304c\u6df7\u3056\u3089\u306a\u3044\u3053\u3068\u3068\u3001\u8aad\u307f\u53d6\u308a\u304c\u8a18\u9332\u306e\u5883\u754c\u3092\u4fdd\u3064\u3053\u3068\u306f\u5225\u3067\u3059\u3002\u901a\u5e38\u306e\u30d1\u30a4\u30d7\u306e\u30d0\u30a4\u30c8\u30b9\u30c8\u30ea\u30fc\u30e0\u3092\u5bfe\u8c61\u306b\u3001\u305d\u306e\u9055\u3044\u3092\u6574\u7406\u3057\u307e\u3059\u3002[1]<\/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>Linux\u3067\u306fPIPE_BUF\u306f4096\u30d0\u30a4\u30c8\u3067\u3059\u3002\u3053\u306e\u7bc4\u56f2\u5185\u306e\u4e00\u56de\u306e\u66f8\u304d\u8fbc\u307f\u306f\u3001\u307b\u304b\u306e\u66f8\u304d\u624b\u306e\u30c7\u30fc\u30bf\u304c\u9014\u4e2d\u306b\u5165\u308a\u8fbc\u307e\u306a\u3044\u5358\u4f4d\u3068\u3057\u3066\u6271\u308f\u308c\u307e\u3059\u3002<\/li>\n<li>PIPE_BUF\u306f\u30d1\u30a4\u30d7\u5168\u4f53\u306e\u5bb9\u91cf\u3068\u306f\u5225\u3067\u3059\u3002\u4fdd\u8a3c\u3055\u308c\u308b\u5358\u4f4d\u304c\u5c0f\u3055\u304f\u3066\u3082\u3001\u7a7a\u304d\u5bb9\u91cf\u304c\u8db3\u308a\u306a\u3051\u308c\u3070\u5f85\u6a5f\u3057\u305f\u308a\u3001\u975e\u30d6\u30ed\u30c3\u30ad\u30f3\u30b0\u3067\u306fEAGAIN\u306b\u306a\u3063\u305f\u308a\u3057\u307e\u3059\u3002<\/li>\n<li>\u901a\u5e38\u306e\u30d1\u30a4\u30d7\u306f\u8aad\u307f\u53d6\u308a\u5074\u3078\u30e1\u30c3\u30bb\u30fc\u30b8\u5883\u754c\u3092\u4f1d\u3048\u307e\u305b\u3093\u3002\u9577\u3055\u3084\u533a\u5207\u308a\u306e\u898f\u5247\u3092\u7528\u610f\u3057\u3001\u5206\u5272\u3055\u308c\u3066\u3082\u9023\u7d50\u3055\u308c\u3066\u3082\u8a18\u9332\u3092\u5fa9\u5143\u3067\u304d\u308b\u3088\u3046\u306b\u3057\u307e\u3059\u3002<\/li>\n<\/ul>\n<\/section>\n<h2>\u539f\u5b50\u7684\u3068\u306f\u3001\u5225\u306e\u66f8\u304d\u8fbc\u307f\u304c\u9014\u4e2d\u306b\u5165\u3089\u306a\u3044\u3053\u3068<\/h2>\n<p>\u3053\u3053\u3067\u306e\u539f\u5b50\u7684\u306a\u66f8\u304d\u8fbc\u307f\u306f\u3001\u6e21\u3057\u305f\u30d0\u30a4\u30c8\u5217\u304c\u3001\u4ed6\u306e\u30d7\u30ed\u30bb\u30b9\u306b\u3088\u308b\u66f8\u304d\u8fbc\u307f\u3068\u4ea4\u4e92\u306b\u6df7\u3056\u3089\u305a\u3001\u9023\u7d9a\u3057\u305f\u4e26\u3073\u3068\u3057\u3066\u30d1\u30a4\u30d7\u3078\u5165\u308b\u3053\u3068\u3092\u6307\u3057\u307e\u3059\u3002CPU\u306e\u4e0d\u53ef\u5206\u547d\u4ee4\u3084\u3001\u8a18\u9332\u3092\u30c7\u30a3\u30b9\u30af\u3078\u6c38\u7d9a\u5316\u3059\u308b\u8a71\u3068\u306f\u5225\u3067\u3059\u3002[1\u3001PIPE_BUF]<\/p>\n<p>\u4e8c\u3064\u306e\u66f8\u304d\u624b\u304c\u3001\u305d\u308c\u305e\u308c12\u30d0\u30a4\u30c8\u306e\u8a18\u9332A\u3068\u8a18\u9332B\u3092\u4e00\u56de\u305a\u3064write\u3078\u6e21\u3057\u305f\u3068\u3057\u307e\u3059\u3002\u4e21\u8005\u304c\u539f\u5b50\u6027\u306e\u6761\u4ef6\u3092\u6e80\u305f\u3057\u3066\u3044\u308c\u3070\u3001\u53d7\u4fe1\u3059\u308b\u30d0\u30a4\u30c8\u5217\u306e\u4e26\u3073\u306f\u3001\u4f8b\u3048\u3070A\u5168\u4f53\u306e\u5f8c\u306bB\u5168\u4f53\u3001\u307e\u305f\u306fB\u5168\u4f53\u306e\u5f8c\u306bA\u5168\u4f53\u3067\u3059\u3002A\u306e\u524d\u534a\u3001B\u306e\u4e00\u90e8\u3001A\u306e\u5f8c\u534a\u3068\u3044\u3046\u3088\u3046\u306b\u3001\u4e00\u56de\u306e\u66f8\u304d\u8fbc\u307f\u306e\u5185\u5074\u3078\u5225\u306e\u66f8\u304d\u8fbc\u307f\u304c\u5165\u308b\u3053\u3068\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n<p>\u3069\u3061\u3089\u306e\u8a18\u9332\u304c\u5148\u306b\u306a\u308b\u304b\u307e\u3067\u3001\u3053\u306e\u4fdd\u8a3c\u304b\u3089\u6c7a\u307e\u308b\u308f\u3051\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u540c\u6642\u306b\u52d5\u304f\u51e6\u7406\u306e\u9806\u5e8f\u3084\u3001\u516c\u5e73\u306b\u4ea4\u4ee3\u3059\u308b\u3053\u3068\u3001\u5f85\u3061\u6642\u9593\u306e\u4e0a\u9650\u3092\u7d04\u675f\u3059\u308b\u6761\u4ef6\u3067\u3082\u3042\u308a\u307e\u305b\u3093\u3002\u300c\u6df7\u3056\u3089\u306a\u3044\u300d\u3068\u300c\u671b\u3093\u3060\u9806\u756a\u3067\u5c4a\u304f\u300d\u3092\u5206\u3051\u3066\u8003\u3048\u307e\u3059\u3002<\/p>\n<h2>4096\u30d0\u30a4\u30c8\u306e\u5883\u754c\u3068\u3001\u30d1\u30a4\u30d7\u306e\u7a7a\u304d\u5bb9\u91cf<\/h2>\n<p>Linux man-pages\u306e\u8aac\u660e\u3067\u306f\u3001Linux\u306ePIPE_BUF\u306f4096\u30d0\u30a4\u30c8\u3067\u3059\u3002\u66f8\u304d\u8fbc\u3080\u9577\u3055n\u304c\u3053\u306e\u5024\u4ee5\u4e0b\u306e\u5834\u5408\u3068\u3001\u8d85\u3048\u308b\u5834\u5408\u3092\u5206\u3051\u3066\u3044\u307e\u3059\u3002POSIX\u304c\u8981\u6c42\u3059\u308b\u6700\u5c0f\u5024\u306f512\u30d0\u30a4\u30c8\u306a\u306e\u3067\u3001Linux\u306e4096\u3068\u3044\u3046\u5024\u3092\u3001\u3059\u3079\u3066\u306e\u74b0\u5883\u306b\u5171\u901a\u3059\u308b\u5b9a\u6570\u3068\u3057\u3066\u4f7f\u3046\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u3002[1]<\/p>\n<p>\u6570\u3048\u308b\u306e\u306f\u6587\u5b57\u6570\u3067\u306f\u306a\u304f\u3001write\u3078\u6e21\u3059\u30d0\u30a4\u30c8\u6570\u3067\u3059\u3002\u65e5\u672c\u8a9e\u3092\u542b\u3080\u8a18\u9332\u3092UTF-8\u3067\u7b26\u53f7\u5316\u3059\u308b\u3068\u3001\u4e00\u6587\u5b57\u304c\u8907\u6570\u30d0\u30a4\u30c8\u306b\u306a\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002\u898b\u305f\u76ee\u306e\u6587\u5b57\u6570\u304c\u540c\u3058\u3067\u3082\u3001\u9001\u308b\u9577\u3055\u306f\u540c\u3058\u3068\u306f\u9650\u308a\u307e\u305b\u3093\u3002\u30d8\u30c3\u30c0\u30fc\u3084\u533a\u5207\u308a\u6587\u5b57\u3082\u542b\u3081\u3066\u3001\u4e00\u56de\u306e\u66f8\u304d\u8fbc\u307f\u306e\u5168\u4f53\u3092\u6570\u3048\u307e\u3059\u3002<\/p>\n<p>\u307e\u305f\u3001PIPE_BUF\u3068\u30d1\u30a4\u30d7\u306e\u5bb9\u91cf\u306f\u7570\u306a\u308a\u307e\u3059\u3002\u5bb9\u91cf\u306f\u3001\u307e\u3060\u8aad\u307f\u53d6\u3089\u308c\u3066\u3044\u306a\u3044\u30c7\u30fc\u30bf\u3092\u3069\u308c\u3060\u3051\u4fdd\u6301\u3067\u304d\u308b\u304b\u306b\u95a2\u4fc2\u3057\u307e\u3059\u3002\u7a7a\u304d\u304c\u591a\u3044\u3068\u3044\u3046\u7406\u7531\u3060\u3051\u3067\u3001PIPE_BUF\u3092\u8d85\u3048\u308b\u66f8\u304d\u8fbc\u307f\u307e\u3067\u539f\u5b50\u7684\u306b\u306a\u308b\u308f\u3051\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u53cd\u5bfe\u306b\u3001\u5c0f\u3055\u306a\u66f8\u304d\u8fbc\u307f\u3067\u3082\u3001\u4eca\u306e\u7a7a\u304d\u304c\u5c11\u306a\u3051\u308c\u3070\u76f4\u3061\u306b\u5b8c\u4e86\u3067\u304d\u308b\u3068\u306f\u9650\u308a\u307e\u305b\u3093\u3002<\/p>\n<h2>\u5f85\u3064\u65b9\u5f0f\u3068\u3001\u5f85\u305f\u306a\u3044\u65b9\u5f0f\u3067\u7d50\u679c\u304c\u5909\u308f\u308b<\/h2>\n<p>\u30d6\u30ed\u30c3\u30ad\u30f3\u30b0\u65b9\u5f0f\u3067n\u304cPIPE_BUF\u4ee5\u4e0b\u306a\u3089\u3001n\u30d0\u30a4\u30c8\u3092\u539f\u5b50\u7684\u306b\u66f8\u304d\u8fbc\u307f\u307e\u3059\u3002\u305f\u3060\u3057\u3001\u3059\u3050\u306bn\u30d0\u30a4\u30c8\u5206\u3092\u5165\u308c\u308b\u7a7a\u304d\u304c\u306a\u3051\u308c\u3070\u3001write\u306f\u5f85\u3064\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002\u539f\u5b50\u6027\u3092\u6e80\u305f\u3059\u3053\u3068\u3068\u3001\u547c\u3073\u51fa\u3057\u304c\u5373\u5ea7\u306b\u623b\u308b\u3053\u3068\u306f\u72ec\u7acb\u3057\u305f\u6761\u4ef6\u3067\u3059\u3002<\/p>\n<p><code>O_NONBLOCK<\/code>\u3092\u6307\u5b9a\u3057\u305f\u975e\u30d6\u30ed\u30c3\u30ad\u30f3\u30b0\u65b9\u5f0f\u3067\u306f\u3001n\u304cPIPE_BUF\u4ee5\u4e0b\u3067\u3001\u5fc5\u8981\u306a\u7a7a\u304d\u304c\u3042\u308c\u3070\u5168n\u30d0\u30a4\u30c8\u3092\u66f8\u304d\u8fbc\u307f\u307e\u3059\u3002\u7a7a\u304d\u304c\u8db3\u308a\u306a\u3051\u308c\u3070\u3001\u9014\u4e2d\u306e\u4e00\u90e8\u3060\u3051\u3092\u5165\u308c\u308b\u4ee3\u308f\u308a\u306b\u3001<code>EAGAIN<\/code>\u3067\u5931\u6557\u3057\u307e\u3059\u3002\u3053\u306e\u5834\u5408\u306f\u300c\u4eca\u306f\u3053\u306e\u5358\u4f4d\u3092\u66f8\u3051\u306a\u3044\u300d\u3068\u3044\u3046\u6271\u3044\u3067\u3059\u3002[1]<\/p>\n<p>\u4e00\u65b9\u3001n\u304cPIPE_BUF\u3092\u8d85\u3048\u308b\u3068\u3001\u5225\u306e\u66f8\u304d\u624b\u306e\u30c7\u30fc\u30bf\u304c\u9014\u4e2d\u3078\u5165\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u975e\u30d6\u30ed\u30c3\u30ad\u30f3\u30b0\u65b9\u5f0f\u3067\u306f\u3001\u7a7a\u304d\u304c\u3042\u3063\u3066\u3082\u8981\u6c42\u3057\u305f\u5168\u9577\u3088\u308a\u77ed\u3044\u66f8\u304d\u8fbc\u307f\u306b\u306a\u308b\u5834\u5408\u304c\u3042\u308a\u3001\u623b\u308a\u5024\u304c\u5b9f\u969b\u306b\u53d7\u3051\u4ed8\u3051\u3089\u308c\u305f\u30d0\u30a4\u30c8\u6570\u3092\u793a\u3057\u307e\u3059\u3002\u6e80\u676f\u306a\u3089EAGAIN\u3067\u3059\u3002\u66f8\u304d\u624b\u306f\u3001\u9577\u3055\u306e\u5927\u5c0f\u3068\u5f85\u6a5f\u65b9\u5f0f\u3092\u7d44\u307f\u5408\u308f\u305b\u3066\u5224\u65ad\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u3053\u308c\u3089\u306f\u901a\u5e38\u306e\u5bb9\u91cf\u6761\u4ef6\u306b\u3064\u3044\u3066\u306e\u6574\u7406\u3067\u3059\u3002\u30b7\u30b0\u30ca\u30eb\u5272\u8fbc\u307f\u3084\u3001\u8aad\u307f\u53d6\u308a\u7aef\u304c\u3059\u3079\u3066\u9589\u3058\u3089\u308c\u305f\u5834\u5408\u306a\u3069\u3001\u5225\u306e\u5931\u6557\u6761\u4ef6\u307e\u3067\u306a\u304f\u306a\u308b\u308f\u3051\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u539f\u5b50\u6027\u3092\u7406\u7531\u306b\u623b\u308a\u5024\u3084\u30a8\u30e9\u30fc\u306e\u78ba\u8a8d\u3092\u7701\u304b\u306a\u3044\u3088\u3046\u306b\u3057\u307e\u3059\u3002<\/p>\n<h2>\u539f\u5b50\u7684\u306b\u66f8\u3044\u3066\u3082\u30018\u30d0\u30a4\u30c8\u305a\u3064\u8aad\u3081\u3070\u8a18\u9332\u306f\u5206\u304b\u308c\u308b<\/h2>\n<p>\u5148\u307b\u3069\u306eA\u3001B\u304c\u305d\u308c\u305e\u308c12\u30d0\u30a4\u30c8\u3067\u3001A\u5168\u4f53\u306e\u5f8c\u306bB\u5168\u4f53\u304c\u66f8\u304b\u308c\u305f\u3068\u3057\u307e\u3059\u3002\u53d7\u4fe1\u5074\u304c8\u30d0\u30a4\u30c8\u305a\u3064\u53d6\u5f97\u3057\u3001\u305d\u306e\u90fd\u5ea68\u30d0\u30a4\u30c8\u3092\u53d7\u3051\u53d6\u308c\u308b\u5834\u5408\u3092\u8003\u3048\u308b\u3068\u3001\u6700\u521d\u306fA\u306e\u5148\u982d8\u30d0\u30a4\u30c8\u3001\u6b21\u306fA\u306e\u6b8b\u308a4\u30d0\u30a4\u30c8\u3068B\u306e\u5148\u982d4\u30d0\u30a4\u30c8\u3001\u6700\u5f8c\u306fB\u306e\u6b8b\u308a8\u30d0\u30a4\u30c8\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<figure><img decoding=\"async\" src=\"https:\/\/quantumsea.net\/wp-content\/uploads\/2026\/10\/qs-linux-pipe-buf-write-atomicity-20261022-figure-f460df0826a9.png\" alt=\"\u66f8\u304d\u8fbc\u307f\u3067\u306fA12\u30d0\u30a4\u30c8\u3001B12\u30d0\u30a4\u30c8\u304c\u9023\u7d9a\u3002\u8aad\u307f\u53d6\u308a\u30928\u30d0\u30a4\u30c8\u305a\u3064\u306b\u5206\u3051\u308b\u3068\u3001\u4e8c\u56de\u76ee\u306fA\u306e\u672b\u5c3e4\u30d0\u30a4\u30c8\u3068B\u306e\u5148\u982d4\u30d0\u30a4\u30c8\u3092\u542b\u3080\u3002\" style=\"max-width:100%;height:auto\"\/><figcaption>\u66f8\u304d\u8fbc\u307f\u9806\u3092A\u3001B\u3068\u56fa\u5b9a\u3057\u305f\u72ec\u81ea\u306e\u30d0\u30a4\u30c8\u5217\u30e2\u30c7\u30eb\u3002read\u304c\u5404\u56de8\u30d0\u30a4\u30c8\u3092\u8fd4\u3059\u5834\u5408\u306e\u4e00\u4f8b\u3067\u3001\u5b9f\u969b\u306b\u306f\u77ed\u3044\u8aad\u307f\u53d6\u308a\u3082\u8d77\u3053\u308a\u5f97\u307e\u3059\u3002<\/figcaption><\/figure>\n<p>\u4e8c\u56de\u76ee\u306eread\u306bA\u3068B\u306e\u4e21\u65b9\u304c\u542b\u307e\u308c\u3066\u3044\u3066\u3082\u3001\u539f\u5b50\u7684\u306a\u66f8\u304d\u8fbc\u307f\u306e\u4fdd\u8a3c\u306b\u306f\u53cd\u3057\u307e\u305b\u3093\u3002\u30d1\u30a4\u30d7\u306e\u4e2d\u3067\u306fA\u3068B\u304c\u9014\u4e2d\u3067\u6df7\u3056\u3089\u305a\u306b\u4e26\u3093\u3067\u3044\u307e\u3059\u3002\u8aad\u307f\u53d6\u308a\u5074\u304c\u3001\u305d\u306e\u9023\u7d9a\u3057\u305f\u30d0\u30a4\u30c8\u5217\u3092\u5225\u306e\u5e45\u3067\u533a\u5207\u3063\u305f\u3060\u3051\u3060\u304b\u3089\u3067\u3059\u3002<\/p>\n<p>\u901a\u5e38\u306e\u30d1\u30a4\u30d7\u306f\u30e1\u30c3\u30bb\u30fc\u30b8\u5883\u754c\u3092\u6301\u305f\u306a\u3044\u305f\u3081\u3001\u4e00\u56de\u306eread\u3092\u4e00\u4ef6\u306e\u8a18\u9332\u3068\u6c7a\u3081\u4ed8\u3051\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u3002\u53d7\u4fe1\u5074\u306b\u306f\u3001\u524d\u56de\u306e\u672a\u5b8c\u4e86\u90e8\u5206\u3092\u6b8b\u3057\u3001\u65b0\u3057\u304f\u8aad\u3093\u3060\u90e8\u5206\u3092\u8db3\u3057\u3066\u3001\u5b8c\u5168\u306a\u8a18\u9332\u304c\u305d\u308d\u3063\u305f\u3068\u3053\u308d\u3067\u53d6\u308a\u51fa\u3059\u51e6\u7406\u304c\u5fc5\u8981\u3067\u3059\u3002\u6539\u884c\u3092\u533a\u5207\u308a\u306b\u3059\u308b\u306a\u3089\u3001\u672c\u6587\u4e2d\u306e\u6539\u884c\u3092\u3069\u3046\u6271\u3046\u304b\u307e\u3067\u6c7a\u3081\u307e\u3059\u3002\u5148\u982d\u306b\u9577\u3055\u3092\u7f6e\u304f\u306a\u3089\u3001\u305d\u306e\u9577\u3055\u60c5\u5831\u81ea\u4f53\u304c\u5206\u5272\u3055\u308c\u308b\u5834\u5408\u306b\u3082\u5bfe\u5fdc\u3057\u307e\u3059\u3002<\/p>\n<h2>\u4e00\u4ef6\u3092\u8907\u6570\u56de\u306b\u5206\u3051\u3066\u66f8\u304f\u3068\u3001\u4fdd\u8a3c\u306e\u5358\u4f4d\u3082\u5909\u308f\u308b<\/h2>\n<p>\u4f8b\u3048\u3070\u3001\u8a18\u9332\u306e\u30d8\u30c3\u30c0\u30fc\u3092write\u3057\u3001\u6b21\u306b\u672c\u6587\u3092\u5225\u306ewrite\u3067\u9001\u308b\u69cb\u6210\u3067\u306f\u3001\u500b\u3005\u306e\u9577\u3055\u304cPIPE_BUF\u4ee5\u4e0b\u3067\u3082\u3001\u305d\u306e\u4e8c\u56de\u3092\u307e\u3068\u3081\u305f\u4e00\u4ef6\u306e\u8a18\u9332\u304c\u539f\u5b50\u7684\u306b\u306a\u308b\u308f\u3051\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u4e8c\u3064\u306e\u547c\u3073\u51fa\u3057\u306e\u9593\u306b\u306f\u3001\u5225\u306e\u66f8\u304d\u624b\u304c\u30c7\u30fc\u30bf\u3092\u5165\u308c\u3089\u308c\u307e\u3059\u3002<\/p>\n<p>\u4e00\u4ef6\u306e\u5168\u4f53\u304c\u4e0a\u9650\u4ee5\u5185\u306a\u3089\u3001\u30d8\u30c3\u30c0\u30fc\u3084\u533a\u5207\u308a\u3082\u542b\u3081\u3066\u4e00\u3064\u306e\u30d0\u30c3\u30d5\u30a1\u3078\u7d44\u307f\u7acb\u3066\u3001\u4e00\u56de\u306e\u66f8\u304d\u8fbc\u307f\u3078\u6e21\u3059\u8a2d\u8a08\u304c\u5019\u88dc\u306b\u306a\u308a\u307e\u3059\u3002\u4e00\u4ef6\u304c\u4e0a\u9650\u3092\u8d85\u3048\u308b\u306a\u3089\u3001\u3059\u3079\u3066\u306e\u66f8\u304d\u624b\u3092\u542b\u3081\u305f\u6392\u4ed6\u5236\u5fa1\u3001\u66f8\u304d\u8fbc\u307f\u3092\u4e00\u3064\u306e\u62c5\u5f53\u3078\u96c6\u7d04\u3059\u308b\u65b9\u5f0f\u3001\u8a18\u9332\u5883\u754c\u3092\u6271\u3048\u308b\u5225\u306e\u901a\u4fe1\u65b9\u5f0f\u306a\u3069\u3092\u691c\u8a0e\u3057\u307e\u3059\u3002\u305f\u3060\u9577\u3044\u8a18\u9332\u3092\u5c0f\u7247\u3078\u5206\u3051\u305f\u3060\u3051\u3067\u306f\u3001\u5c0f\u7247\u306e\u9593\u306b\u5225\u306e\u8a18\u9332\u304c\u5165\u308b\u554f\u984c\u306f\u6b8b\u308a\u307e\u3059\u3002<\/p>\n<p>\u53d7\u4fe1\u5074\u306e\u9577\u3055\u60c5\u5831\u306f\u8a18\u9332\u3092\u533a\u5207\u308b\u52a9\u3051\u306b\u306a\u308a\u307e\u3059\u304c\u3001\u305d\u308c\u3060\u3051\u3067\u9001\u4fe1\u5074\u306e\u6df7\u5728\u3092\u9632\u3050\u3082\u306e\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u8907\u6570\u306e\u66f8\u304d\u624b\u304c\u540c\u3058\u901a\u4fe1\u8def\u3092\u4f7f\u3046\u5834\u5408\u306b\u306f\u3001\u30d0\u30a4\u30c8\u5217\u3092\u6df7\u305c\u305a\u306b\u5165\u308c\u308b\u65b9\u6cd5\u3068\u3001\u53d7\u4fe1\u3057\u305f\u30d0\u30a4\u30c8\u5217\u304b\u3089\u8a18\u9332\u3092\u53d6\u308a\u51fa\u3059\u65b9\u6cd5\u306e\u4e21\u65b9\u304c\u5fc5\u8981\u3067\u3059\u3002<\/p>\n<p>\u30ed\u30b0\u304c\u58ca\u308c\u308b\u539f\u56e0\u3092\u8ffd\u3046\u3068\u304d\u306f\u3001\u4e00\u4ef6\u306e\u7b26\u53f7\u5316\u5f8c\u306e\u9577\u3055\u3001\u4e00\u4ef6\u3042\u305f\u308a\u306ewrite\u56de\u6570\u3001\u540c\u3058\u30d1\u30a4\u30d7\u3078\u66f8\u304f\u4e3b\u4f53\u306e\u6570\u3001\u5f85\u6a5f\u65b9\u5f0f\u3001read\u306e\u623b\u308a\u5024\u306e\u6271\u3044\u3092\u4e26\u3079\u3066\u78ba\u8a8d\u3057\u307e\u3059\u3002\u30d1\u30a4\u30d7\u306e\u5bb9\u91cf\u3092\u5897\u3084\u3059\u524d\u306b\u3001\u3069\u306e\u5358\u4f4d\u306e\u539f\u5b50\u6027\u304c\u4fdd\u8a3c\u3055\u308c\u3001\u3069\u306e\u5883\u754c\u306f\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u304c\u4f5c\u308b\u306e\u304b\u3092\u660e\u78ba\u306b\u3059\u308b\u3053\u3068\u304c\u51fa\u767a\u70b9\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<h2>\u51fa\u5178<\/h2>\n<ul>\n<li>[1] <a href=\"https:\/\/man7.org\/linux\/man-pages\/man7\/pipe.7.html\">Linux man-pages 6.19 \u2014 pipe(7)<\/a>\u3001I\/O on pipes and FIFOs\u3001Pipe capacity\u3001PIPE_BUF\u3002\u901a\u5e38\u306e\u30d1\u30a4\u30d7\u306e\u30d0\u30a4\u30c8\u30b9\u30c8\u30ea\u30fc\u30e0\u3001\u539f\u5b50\u7684\u66f8\u304d\u8fbc\u307f\u306e\u56db\u6761\u4ef6\u3001Linux\u306e\u5024\u3068POSIX\u306e\u6700\u5c0f\u5024\u3092\u53c2\u7167\u30022026\u5e7410\u670822\u65e5\u4fdd\u5b58\u7248\u3002\u56f3\u306812\u30d0\u30a4\u30c8\u4e8c\u4ef6\u306e\u8aad\u307f\u53d6\u308a\u4f8b\u306f\u72ec\u81ea\u306e\u30e2\u30c7\u30eb\u3067\u3001Linux\u30ab\u30fc\u30cd\u30eb\u3092\u5b9f\u884c\u3057\u305f\u6e2c\u5b9a\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>\u8907\u6570\u306e\u51e6\u7406\u304c\u540c\u3058\u30d1\u30a4\u30d7\u3078\u30ed\u30b0\u3092\u9001\u308a\u3001\u4e00\u3064\u306e\u51e6\u7406\u304c\u307e\u3068\u3081\u3066\u8aad\u307f\u53d6\u308b\u3002\u305d\u306e\u3068\u304d\u3001\u3042\u308b\u66f8\u304d\u624b\u306e\u4e00\u884c\u306e\u9014\u4e2d\u3078\u3001\u5225\u306e\u66f8\u304d\u624b\u306e\u6587\u5b57\u304c\u5165\u308a\u8fbc\u3080\u3068\u3001\u53d7\u4fe1\u5074\u306f\u8a18\u9332\u3092\u6b63\u3057\u304f\u89e3\u91c8\u3067\u304d\u307e\u305b\u3093\u3002Linux\u306e\u30d1\u30a4\u30d7\u306b\u306f\u3001\u5c0f\u3055\u306a\u66f8\u304d\u8fbc\u307f\u3092\u4ed6\u306e\u66f8\u304d\u8fbc\u307f [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":1204,"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-1207","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-linux-pipe-buf-write-atomicity-20261022-featured-7b9be13e4b92.png","_links":{"self":[{"href":"https:\/\/quantumsea.net\/index.php?rest_route=\/wp\/v2\/posts\/1207","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=1207"}],"version-history":[{"count":1,"href":"https:\/\/quantumsea.net\/index.php?rest_route=\/wp\/v2\/posts\/1207\/revisions"}],"predecessor-version":[{"id":1208,"href":"https:\/\/quantumsea.net\/index.php?rest_route=\/wp\/v2\/posts\/1207\/revisions\/1208"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/quantumsea.net\/index.php?rest_route=\/wp\/v2\/media\/1204"}],"wp:attachment":[{"href":"https:\/\/quantumsea.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1207"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/quantumsea.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1207"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/quantumsea.net\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1207"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}