{"id":1273,"date":"2026-10-24T17:00:00","date_gmt":"2026-10-24T08:00:00","guid":{"rendered":"https:\/\/quantumsea.net\/?p=1273"},"modified":"2026-10-23T00:41:11","modified_gmt":"2026-10-22T15:41:11","slug":"qs-oappend-write-record-boundary-20261023","status":"publish","type":"post","link":"https:\/\/quantumsea.net\/?p=1273","title":{"rendered":"O_APPEND\u306e\u8ffd\u8a18\u3001\u672b\u5c3e\u3078\u306e\u66f8\u304d\u8fbc\u307f\u3068\u4e00\u3064\u306e\u8a18\u9332\u3092\u5206\u3051\u3066\u8003\u3048\u308b"},"content":{"rendered":"<p>\u8907\u6570\u306e\u51e6\u7406\u304c\u540c\u3058\u30ed\u30b0\u3078\u66f8\u304d\u8db3\u3059\u3068\u304d\u3001\u300c\u672b\u5c3e\u3092\u8abf\u3079\u3066\u3001\u305d\u306e\u4f4d\u7f6e\u3078\u66f8\u304f\u300d\u3068\u3044\u3046\u65b9\u6cd5\u3067\u8db3\u308a\u308b\u3067\u3057\u3087\u3046\u304b\u3002\u4e8c\u3064\u306e\u51e6\u7406\u304c\u540c\u3058\u672b\u5c3e\u4f4d\u7f6e\u3092\u898b\u3064\u3051\u308c\u3070\u3001\u7247\u65b9\u306e\u8a18\u9332\u3092\u3082\u3046\u7247\u65b9\u304c\u4e0a\u66f8\u304d\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002Linux\u306e<strong>O_APPEND<\/strong>\u306f\u3001\u3053\u306e\u672b\u5c3e\u4f4d\u7f6e\u306e\u6c7a\u5b9a\u3068\u66f8\u304d\u8fbc\u307f\u306e\u9593\u306b\u3042\u308b\u9699\u9593\u3092\u306a\u304f\u3059\u305f\u3081\u306e\u6307\u5b9a\u3067\u3059\u3002<\/p>\n<p>\u305f\u3060\u3057\u3001\u8ffd\u8a18\u30e2\u30fc\u30c9\u3067\u958b\u3051\u3070\u4e00\u884c\u306e\u30ed\u30b0\u304c\u5fc5\u305a\u4e38\u3054\u3068\u4fdd\u5b58\u3055\u308c\u3001\u969c\u5bb3\u5f8c\u3082\u6b8b\u308b\u3001\u3068\u3044\u3046\u610f\u5473\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u672b\u5c3e\u3078\u7f6e\u304f\u3053\u3068\u3001\u4e00\u3064\u306e\u8a18\u9332\u3068\u3057\u3066\u307e\u3068\u307e\u308b\u3053\u3068\u3001\u4fdd\u5b58\u304c\u78ba\u5b9a\u3059\u308b\u3053\u3068\u3092\u5206\u3051\u3066\u8003\u3048\u307e\u3059\u3002<\/p>\n<section 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man-pages\u306f\u5b9a\u7fa9\u3057\u3066\u3044\u307e\u3059\u3002[1\u30012] \u3053\u3053\u3067\u4e0d\u53ef\u5206\u306a\u306e\u306f\u3001\u672b\u5c3e\u3092\u9078\u3076\u51e6\u7406\u3068\u4e00\u56de\u306ewrite\u306e\u7d44\u3067\u3059\u3002<\/p>\n<p>\u5148\u307b\u3069\u306e\u4f8b\u3067\u3001A\u306e4\u30d0\u30a4\u30c8\u66f8\u304d\u8fbc\u307f\u304c\u5148\u306b\u7d42\u308f\u308b\u306a\u3089\u3001A\u306f100\u304b\u3089103\u3078\u66f8\u304d\u3001\u6b21\u306eB\u306f\u65b0\u3057\u3044\u672b\u5c3e104\u304b\u3089107\u3078\u66f8\u304d\u307e\u3059\u3002\u30d5\u30a1\u30a4\u30eb\u306f108\u30d0\u30a4\u30c8\u3068\u306a\u308a\u3001\u8ffd\u52a0\u3055\u308c\u305f\u90e8\u5206\u306fAAAABBBB\u3067\u3059\u3002\u53cd\u5bfe\u306bB\u304c\u5148\u306a\u3089BBBBAAAA\u3068\u306a\u308a\u307e\u3059\u3002\u4e21\u65b9\u306e\u8a18\u9332\u3092\u672b\u5c3e\u306b\u7f6e\u3051\u3066\u3082\u3001\u3069\u3061\u3089\u304c\u5148\u306b\u306a\u308b\u304b\u307e\u3067O_APPEND\u304c\u696d\u52d9\u4e0a\u306e\u9806\u5e8f\u3068\u3057\u3066\u6c7a\u3081\u308b\u308f\u3051\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n<p>\u91cd\u8981\u306a\u306e\u306f\u3001\u672b\u5c3e\u3078\u306e\u79fb\u52d5\u304c\u300c\u958b\u3044\u305f\u3068\u304d\u306b\u4e00\u5ea6\u3060\u3051\u300d\u3067\u306f\u306a\u304f\u3001write\u3054\u3068\u306b\u884c\u308f\u308c\u308b\u70b9\u3067\u3059\u3002\u6700\u521d\u306blseek\u3067\u672b\u5c3e\u3078\u79fb\u52d5\u3057\u3066\u304a\u304f\u3053\u3068\u3084\u3001\u4e00\u5ea6\u5f97\u305f\u30d5\u30a1\u30a4\u30eb\u30b5\u30a4\u30ba\u3092\u4fdd\u5b58\u3057\u3066\u304a\u304f\u3053\u3068\u3067\u306f\u3001\u5f8c\u304b\u3089\u5225\u306e\u66f8\u304d\u624b\u304c\u5ef6\u3070\u3057\u305f\u9577\u3055\u306b\u8ffd\u968f\u3067\u304d\u307e\u305b\u3093\u3002<\/p>\n<figure><a href=\"https:\/\/quantumsea.net\/wp-content\/uploads\/2026\/10\/qs-oappend-write-record-boundary-20261023-figure-fc13965afa13.png\"><img decoding=\"async\" src=\"https:\/\/quantumsea.net\/wp-content\/uploads\/2026\/10\/qs-oappend-write-record-boundary-20261023-figure-fc13965afa13.png\" alt=\"\u5225\u3005\u306b\u672b\u5c3e100\u3092\u9078\u3076\u3068A\u3068B\u304c\u540c\u3058\u4f4d\u7f6e\u306b\u66f8\u304d\u9577\u3055104\u3002\u8ffd\u8a18\u64cd\u4f5c\u304c\u9806\u306b\u5b8c\u4e86\u3059\u308b\u3068A\u306f100\u3001B\u306f104\u304b\u3089\u66f8\u304d\u9577\u3055108\u3002\" style=\"width:100%;height:auto;max-width:1200px\"><\/a><figcaption>\u5404write\u304c4\u30d0\u30a4\u30c8\u3059\u3079\u3066\u3092\u66f8\u3051\u308b\u3068\u4eee\u5b9a\u3057\u305f\u72ec\u81ea\u306e\u9806\u5e8f\u30e2\u30c7\u30eb\u3002\u5225\u3005\u306e\u30aa\u30fc\u30d7\u30f3\u30d5\u30a1\u30a4\u30eb\u8a18\u8ff0\u3092\u4f7f\u3044\u3001A\u306e\u66f8\u304d\u8fbc\u307f\u5f8c\u306bB\u304c\u66f8\u304f\u4e00\u3064\u306e\u9806\u5e8f\u3092\u793a\u3059\u3002\u5b9f\u6a5f\u306e\u4e26\u884c\u8ca0\u8377\u8a66\u9a13\u3067\u306f\u306a\u3044\u3002<\/figcaption><\/figure>\n<h2>\u4e00\u884c\u3068\u3001\u4e00\u56de\u306ewrite\u306f\u540c\u3058\u3068\u306f\u9650\u3089\u306a\u3044<\/h2>\n<p>\u30ed\u30b0\u306e\u4e00\u884c\u3092\u4e00\u3064\u306e\u8a18\u9332\u3068\u3057\u3066\u6271\u3044\u305f\u3044\u3068\u3057\u307e\u3059\u3002\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3067\u306f\u4e00\u884c\u3067\u3082\u3001\u5b9f\u969b\u306b\u306f\u300c\u6642\u523b\u3068\u8b58\u5225\u5b50\u300d\u300c\u672c\u6587\u300d\u300c\u6539\u884c\u300d\u3092\u5225\u3005\u306ewrite\u3067\u9001\u3063\u3066\u3044\u308b\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u3002O_APPEND\u306f\u3001\u305d\u308c\u3089\u8907\u6570\u56de\u306e\u547c\u3073\u51fa\u3057\u3092\u4e00\u3064\u306e\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3\u306b\u307e\u3068\u3081\u307e\u305b\u3093\u3002<\/p>\n<p>\u8aac\u660e\u7528\u306b\u3001A\u306e\u8a18\u9332\u3092<code>A[<\/code>\u3068<code>]\\n<\/code>\u306e\u4e8c\u56de\u306b\u5206\u3051\uff08\\n\u306f\u6539\u884c\u3092\u8868\u3059\uff09\u3001\u305d\u306e\u9593\u306bB\u304c<code>B\\n<\/code>\u3092\u66f8\u3044\u305f\u9806\u5e8f\u3092\u8003\u3048\u307e\u3059\u3002\u3059\u3079\u3066\u304c\u6b63\u5e38\u306a\u8ffd\u8a18\u3067\u3082\u3001\u8ffd\u52a0\u90e8\u5206\u306f<code>A[B\\n]\\n<\/code>\u3068\u306a\u308a\u307e\u3059\u3002A\u306e\u8a18\u9332\u3092\u5b8c\u6210\u3055\u305b\u308b\u307e\u3067B\u3092\u5f85\u305f\u305b\u308b\u7d04\u675f\u306f\u3001O_APPEND\u3060\u3051\u304b\u3089\u306f\u5f97\u3089\u308c\u306a\u3044\u305f\u3081\u3067\u3059\u3002<\/p>\n<p>\u307e\u305f\u3001\u8a00\u8a9e\u306e\u300c\u4e00\u56de\u306e\u51fa\u529b\u95a2\u6570\u300d\u304c\u3001\u5fc5\u305a\u4e00\u56de\u306e\u30b7\u30b9\u30c6\u30e0\u30b3\u30fc\u30eb\u306b\u306a\u308b\u3068\u3082\u9650\u308a\u307e\u305b\u3093\u3002\u30d0\u30c3\u30d5\u30a1\u30ea\u30f3\u30b0\u3059\u308b\u30e9\u30a4\u30d6\u30e9\u30ea\u3092\u4f7f\u3046\u5834\u5408\u306b\u306f\u3001\u305d\u306e\u5c64\u3067\u3069\u306e\u5358\u4f4d\u306b\u307e\u3068\u3081\u3089\u308c\u3001\u3044\u3064write\u3078\u6e21\u3055\u308c\u308b\u306e\u304b\u3092\u78ba\u8a8d\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u3053\u3067\u554f\u984c\u306b\u3057\u3066\u3044\u308b\u5358\u4f4d\u306f\u3001\u753b\u9762\u4e0a\u306e\u884c\u6570\u3084\u95a2\u6570\u540d\u3067\u306f\u306a\u304f\u3001\u5b9f\u969b\u306e\u66f8\u304d\u8fbc\u307f\u547c\u3073\u51fa\u3057\u3067\u3059\u3002<\/p>\n<p>\u4e00\u3064\u306e\u8a18\u9332\u3092\u4e00\u3064\u306e\u30d0\u30c3\u30d5\u30a1\u306b\u307e\u3068\u3081\u3001\u5168\u91cf\u304c\u4e00\u56de\u3067\u66f8\u3051\u305f\u5834\u5408\u306f\u3001\u8907\u6570\u56de\u306b\u5206\u5272\u3057\u305f\u9699\u9593\u3092\u6e1b\u3089\u305b\u307e\u3059\u3002\u305f\u3060\u3057\u3001\u3053\u308c\u3092\u3042\u3089\u3086\u308b\u30b5\u30a4\u30ba\u30fb\u4fdd\u5b58\u5148\u3067\u306e\u7121\u6761\u4ef6\u306a\u5168\u91cf\u6210\u529f\u306e\u4fdd\u8a3c\u306b\u7f6e\u304d\u63db\u3048\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u3002<\/p>\n<h2>\u77ed\u3044\u66f8\u304d\u8fbc\u307f\u306e\u7d9a\u304d\u3092\u3001\u5225\u306e\u8ffd\u8a18\u3068\u3057\u3066\u8003\u3048\u308b<\/h2>\n<p>write\u306f\u8981\u6c42\u3057\u305f\u30d0\u30a4\u30c8\u6570\u3088\u308a\u5c11\u306a\u3044\u6570\u3092\u8fd4\u3057\u3066\u6210\u529f\u3059\u308b\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002[2] 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man-pages\u306eopen(2)\u306f\u3001NFS\u4e0a\u3067\u8907\u6570\u30d7\u30ed\u30bb\u30b9\u304c\u540c\u6642\u306b\u8ffd\u8a18\u3059\u308b\u3068\u7834\u640d\u306b\u3064\u306a\u304c\u308a\u5f97\u308b\u3068\u6ce8\u610f\u3057\u3066\u3044\u307e\u3059\u3002\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u5074\u3067\u8ffd\u8a18\u3092\u6a21\u64ec\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u3001\u7af6\u5408\u3092\u907f\u3051\u3089\u308c\u306a\u3044\u305f\u3081\u3067\u3059\u3002[1\u3001O_APPEND] \u30ed\u30fc\u30ab\u30eb\u306e\u901a\u5e38\u30d5\u30a1\u30a4\u30eb\u3067\u8aac\u660e\u3057\u305f\u4fdd\u8a3c\u3092\u3001\u30d5\u30a1\u30a4\u30eb\u30d1\u30b9\u304c\u898b\u3048\u308b\u3068\u3044\u3046\u7406\u7531\u3060\u3051\u3067\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u4e0a\u306e\u4fdd\u5b58\u5148\u3078\u5e83\u3052\u306a\u3044\u3053\u3068\u304c\u5fc5\u8981\u3067\u3059\u3002<\/p>\n<p>\u3055\u3089\u306b\u3001write\u304c\u6b63\u5e38\u306b\u623b\u3063\u305f\u3053\u3068\u306f\u3001\u30c7\u30fc\u30bf\u304c\u8a18\u61b6\u88c5\u7f6e\u3078\u6c38\u7d9a\u5316\u3055\u308c\u305f\u4fdd\u8a3c\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002[2\u3001NOTES] 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href=\"https:\/\/man7.org\/linux\/man-pages\/man2\/open.2.html\">Linux man-pages 6.19, open(2)<\/a>\u3001O_APPEND\u3002\u672b\u5c3e\u4f4d\u7f6e\u3068\u66f8\u304d\u8fbc\u307f\u306e\u4e0d\u53ef\u5206\u6027\u3001NFS\u4e0a\u306e\u6ce8\u610f\u70b9\u3002<\/li>\n<li><a href=\"https:\/\/man7.org\/linux\/man-pages\/man2\/write.2.html\">Linux man-pages 6.19, write(2)<\/a>\uff08\u30da\u30fc\u30b8\u65e5\u4ed82026\u5e742\u67088\u65e5\uff09\u3001DESCRIPTION\u3001RETURN VALUE\u3001NOTES\u3002\u77ed\u3044\u66f8\u304d\u8fbc\u307f\u3068\u6c38\u7d9a\u5316\u3068\u306e\u533a\u5225\u3002\u56f3\u3068\u6570\u5024\u4f8b\u306f\u3001\u660e\u8a18\u3057\u305f\u9806\u5e8f\u3092\u4e0e\u3048\u305f\u72ec\u81ea\u30e2\u30c7\u30eb\u3067\u3059\u3002<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"<p>\u8907\u6570\u306e\u51e6\u7406\u304c\u540c\u3058\u30ed\u30b0\u3078\u66f8\u304d\u8db3\u3059\u3068\u304d\u3001\u300c\u672b\u5c3e\u3092\u8abf\u3079\u3066\u3001\u305d\u306e\u4f4d\u7f6e\u3078\u66f8\u304f\u300d\u3068\u3044\u3046\u65b9\u6cd5\u3067\u8db3\u308a\u308b\u3067\u3057\u3087\u3046\u304b\u3002\u4e8c\u3064\u306e\u51e6\u7406\u304c\u540c\u3058\u672b\u5c3e\u4f4d\u7f6e\u3092\u898b\u3064\u3051\u308c\u3070\u3001\u7247\u65b9\u306e\u8a18\u9332\u3092\u3082\u3046\u7247\u65b9\u304c\u4e0a\u66f8\u304d\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002Linux\u306eO_APPEND\u306f\u3001\u3053 [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":1271,"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-1273","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-oappend-write-record-boundary-20261023-featured-d215fae5ea51.png","_links":{"self":[{"href":"https:\/\/quantumsea.net\/index.php?rest_route=\/wp\/v2\/posts\/1273","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=1273"}],"version-history":[{"count":1,"href":"https:\/\/quantumsea.net\/index.php?rest_route=\/wp\/v2\/posts\/1273\/revisions"}],"predecessor-version":[{"id":1277,"href":"https:\/\/quantumsea.net\/index.php?rest_route=\/wp\/v2\/posts\/1273\/revisions\/1277"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/quantumsea.net\/index.php?rest_route=\/wp\/v2\/media\/1271"}],"wp:attachment":[{"href":"https:\/\/quantumsea.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1273"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/quantumsea.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1273"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/quantumsea.net\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1273"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}