{"id":1150,"date":"2026-10-23T11:00:00","date_gmt":"2026-10-23T02:00:00","guid":{"rendered":"https:\/\/quantumsea.net\/?p=1150"},"modified":"2026-10-22T16:36:17","modified_gmt":"2026-10-22T07:36:17","slug":"qs-udp-datagram-truncation-20261022","status":"publish","type":"post","link":"https:\/\/quantumsea.net\/?p=1150","title":{"rendered":"UDP\u306e\u53d7\u4fe1\u9818\u57df\u304c\u8db3\u308a\u306a\u3044\u3068\u304d\u3001\u7d9a\u304d\u3092\u8aad\u3081\u306a\u3044\u7406\u7531\u3068MSG_TRUNC"},"content":{"rendered":"<p>UDP\u3067\u9001\u3063\u305f\u30c7\u30fc\u30bf\u304c\u3001\u53d7\u4fe1\u5074\u3067\u306f\u9014\u4e2d\u307e\u3067\u3057\u304b\u898b\u3048\u306a\u3044\u3002\u6b21\u306e\u53d7\u4fe1\u3067\u7d9a\u304d\u3092\u8aad\u3081\u308b\u3068\u601d\u3063\u3066\u5f85\u3064\u3068\u3001\u5225\u306e\u30c7\u30fc\u30bf\u304c\u8fd4\u3063\u3066\u304f\u308b\u3002\u3053\u3046\u3057\u305f\u554f\u984c\u3092\u8abf\u3079\u308b\u306b\u306f\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306e\u6b20\u843d\u3068\u3001\u53d7\u4fe1\u51e6\u7406\u304c\u7528\u610f\u3057\u305f\u9818\u57df\u306e\u4e0d\u8db3\u3092\u5206\u3051\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002Linux\u306e\u901a\u5e38\u306eUDP\u53d7\u4fe1\u3092\u4f8b\u306b\u3001\u30e1\u30c3\u30bb\u30fc\u30b8\u306e\u5883\u754c\u3068\u5207\u308a\u8a70\u3081\u306e\u691c\u51fa\u3092\u6574\u7406\u3057\u307e\u3059\u3002<\/p>\n<section 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style=\"margin:24px 0;max-width:100%;\"><img decoding=\"async\" src=\"https:\/\/quantumsea.net\/wp-content\/uploads\/2026\/10\/qs-udp-datagram-truncation-20261022-figure-53b569a71745.png\" alt=\"6\u30d0\u30a4\u30c8\u306eABCDEF\u30682\u30d0\u30a4\u30c8\u306eXY\u304c\u5f85\u3063\u3066\u3044\u308b\u4f8b\u30024\u30d0\u30a4\u30c8\u306e\u9818\u57df\u3067UDP\u3092\u53d7\u4fe1\u3059\u308b\u3068\u3001\u4e00\u56de\u76ee\u306fABCD\u3067EF\u306f\u5207\u308a\u6368\u3066\u3001\u4e8c\u56de\u76ee\u306fXY\u306b\u306a\u308b\u3002\u9023\u7d9a\u30d0\u30a4\u30c8\u5217\u306e\u30e2\u30c7\u30eb\u3067\u306fABCD\u3068EFXY\u306b\u306a\u308b\u3002\" 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057\u305f\u6761\u4ef6\u3092\u4e00\u7dd2\u306b\u8aad\u307f\u307e\u3059\u3002<\/p>\n<p>\u53d7\u4fe1\u5f85\u3061\u306e\u30c7\u30fc\u30bf\u304c\u306a\u3044\u975e\u30d6\u30ed\u30c3\u30ad\u30f3\u30b0\u64cd\u4f5c\u3067\u306f\u3001EAGAIN\u3084EWOULDBLOCK\u3068\u3044\u3046\u30a8\u30e9\u30fc\u6761\u4ef6\u3082\u3042\u308a\u307e\u3059\u3002\u3053\u308c\u306f\u3001\u6b63\u5e38\u306b\u53d7\u3051\u53d6\u3063\u305f\u7a7a\u306e\u30e1\u30c3\u30bb\u30fc\u30b8\u3068\u306f\u5225\u3067\u3059\u3002\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u72b6\u614b\u8868\u306b\u306f\u300c\u5b8c\u5168\u306a\u30c7\u30fc\u30bf\u30b0\u30e9\u30e0\u300d\u300c\u5207\u308a\u8a70\u3081\u300d\u300c\u7a7a\u306e\u30c7\u30fc\u30bf\u30b0\u30e9\u30e0\u300d\u300c\u4eca\u306f\u30c7\u30fc\u30bf\u306a\u3057\u300d\u3092\u5206\u3051\u3066\u7f6e\u304f\u3068\u3001\u518d\u8a66\u884c\u3084\u7834\u68c4\u306e\u7406\u7531\u304c\u66d6\u6627\u306b\u306a\u308a\u306b\u304f\u304f\u306a\u308a\u307e\u3059\u3002<\/p>\n<h2>\u53d7\u4fe1\u5148\u306e\u9818\u57df\u3092\u5897\u3084\u3059\u3060\u3051\u3067\u89e3\u6c7a\u3059\u308b\u304b<\/h2>\n<p>\u4eca\u56de\u4e0d\u8db3\u3057\u3066\u3044\u305f\u306e\u306f\u3001\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u304c\u4e00\u56de\u306e\u53d7\u4fe1\u306b\u6e21\u3057\u305f\u9818\u57df\u3067\u3059\u3002\u30ab\u30fc\u30cd\u30eb\u5074\u3067\u53d7\u4fe1\u5f85\u3061\u306e\u30c7\u30fc\u30bf\u3092\u84c4\u3048\u308b\u5bb9\u91cf\u3084\u3001\u7d4c\u8def\u4e0a\u3067\u6271\u3048\u308b\u30d1\u30b1\u30c3\u30c8\u306e\u5927\u304d\u3055\u3068\u306f\u3001\u540c\u3058\u3082\u306e\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u4e00\u3064\u306e\u8a2d\u5b9a\u5024\u3092\u5927\u304d\u304f\u3057\u3066\u3001\u4e09\u3064\u306e\u554f\u984c\u304c\u307e\u3068\u3081\u3066\u89e3\u6d88\u3059\u308b\u3068\u8003\u3048\u306a\u3044\u3088\u3046\u306b\u3057\u307e\u3059\u3002<\/p>\n<p>\u53d7\u4fe1\u5074\u3067\u306e\u6bd4\u8f03\u6750\u6599\u306f\u3001\u901a\u4fe1\u898f\u7d04\u304c\u8a31\u3059\u6700\u5927\u9577\u3001\u305d\u306e\u9577\u3055\u3092\u53ce\u3081\u308b\u9818\u57df\u3001\u5207\u308a\u8a70\u3081\u305f\u969b\u306e\u6271\u3044\u3067\u3059\u3002\u90e8\u5206\u7684\u306aJSON\u3084\u56fa\u5b9a\u9577\u306e\u8a08\u6e2c\u8a18\u9332\u3092\u901a\u5e38\u306e\u30c7\u30fc\u30bf\u3068\u3057\u3066\u51e6\u7406\u3059\u308b\u524d\u306b\u3001\u5b8c\u5168\u306a\u30e1\u30c3\u30bb\u30fc\u30b8\u3060\u3063\u305f\u304b\u3092\u78ba\u304b\u3081\u307e\u3059\u3002\u518d\u9001\u304c\u5fc5\u8981\u306a\u3089\u3001\u76f8\u624b\u3078\u4f55\u3092\u8981\u6c42\u3059\u308b\u304b\u3001\u540c\u3058\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u3069\u3046\u8b58\u5225\u3059\u308b\u304b\u3082\u901a\u4fe1\u898f\u7d04\u306b\u542b\u3081\u307e\u3059\u3002<\/p>\n<p>MSG_WAITALL\u3092\u4f7f\u3048\u3070\u8907\u6570\u56de\u5206\u3092\u3064\u306a\u3044\u3067\u57cb\u3081\u3089\u308c\u308b\u3001\u3068\u3044\u3046\u89e3\u6c7a\u7b56\u3082UDP\u306b\u306f\u5f53\u3066\u306f\u307e\u308a\u307e\u305b\u3093\u3002Linux\u306e\u8cc7\u6599\u3067\u306f\u3001\u3053\u306e\u6307\u5b9a\u306f\u30c7\u30fc\u30bf\u30b0\u30e9\u30e0\u30bd\u30b1\u30c3\u30c8\u306b\u52b9\u679c\u304c\u306a\u3044\u3068\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u53d7\u4fe1\u65b9\u6cd5\u306e\u5951\u7d04\u3092\u5909\u3048\u305a\u306b\u3001\u30d0\u30c3\u30d5\u30a1\u3060\u3051\u3092\u6e80\u305f\u3059\u767a\u60f3\u3078\u5bc4\u305b\u306a\u3044\u3053\u3068\u304c\u5927\u5207\u3067\u3059\u3002<\/p>\n<p>\u306a\u304a\u3001UDP_GRO\u3092\u660e\u793a\u7684\u306b\u4f7f\u3046\u69cb\u6210\u3067\u306f\u3001\u8907\u6570\u30c7\u30fc\u30bf\u30b0\u30e9\u30e0\u5206\u3092\u307e\u3068\u3081\u305f\u9818\u57df\u3068\u3001\u533a\u5207\u308a\u3092\u8868\u3059\u88dc\u52a9\u60c5\u5831\u3092\u53d7\u3051\u53d6\u308b\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002\u672c\u7a3f\u306e\u901a\u5e38\u53d7\u4fe1\u30e2\u30c7\u30eb\u3092\u3001\u305d\u306e\u8a2d\u5b9a\u3078\u7121\u6761\u4ef6\u306b\u5e83\u3052\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u3002\u307e\u305a\u6709\u52b9\u306a\u30bd\u30b1\u30c3\u30c8\u30aa\u30d7\u30b7\u30e7\u30f3\u3092\u78ba\u8a8d\u3057\u3001\u305d\u306e\u4e0a\u3067\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u304c\u53d7\u3051\u53d6\u308b\u5358\u4f4d\u3092\u8ffd\u3044\u307e\u3059\u3002<\/p>\n<h2>\u51fa\u5178\u30fb\u53c2\u8003\u8cc7\u6599<\/h2>\n<ul>\n<li><a href=\"https:\/\/man7.org\/linux\/man-pages\/man7\/udp.7.html\">Linux man-pages 6.19 \u2014 udp(7)<\/a>\uff1aDESCRIPTION\u306e\u901a\u5e38\u53d7\u4fe1\u30fb\u5207\u308a\u8a70\u3081\u3001Socket options\u306eUDP_GRO\u3002<\/li>\n<li><a href=\"https:\/\/man7.org\/linux\/man-pages\/man2\/recvmsg.2.html\">Linux man-pages 6.19 \u2014 recv(2) \/ recvmsg(2)<\/a>\uff1aflags\u5f15\u6570\u3001recvmsg\u306emsg_flags\u3001RETURN VALUE\u3002\u63b2\u8f09HTML\u30922026\u5e7410\u670822\u65e5\u78ba\u8a8d\u3002\u6587\u5b57\u5217\u306e\u6bd4\u8f03\u3068\u56f3\u306f\u672c\u7a3f\u306e\u72ec\u81ea\u30e2\u30c7\u30eb\u3002<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>UDP\u3067\u9001\u3063\u305f\u30c7\u30fc\u30bf\u304c\u3001\u53d7\u4fe1\u5074\u3067\u306f\u9014\u4e2d\u307e\u3067\u3057\u304b\u898b\u3048\u306a\u3044\u3002\u6b21\u306e\u53d7\u4fe1\u3067\u7d9a\u304d\u3092\u8aad\u3081\u308b\u3068\u601d\u3063\u3066\u5f85\u3064\u3068\u3001\u5225\u306e\u30c7\u30fc\u30bf\u304c\u8fd4\u3063\u3066\u304f\u308b\u3002\u3053\u3046\u3057\u305f\u554f\u984c\u3092\u8abf\u3079\u308b\u306b\u306f\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306e\u6b20\u843d\u3068\u3001\u53d7\u4fe1\u51e6\u7406\u304c\u7528\u610f\u3057\u305f\u9818\u57df\u306e\u4e0d\u8db3\u3092\u5206\u3051\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002L [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":1148,"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":[29],"tags":[244],"class_list":["post-1150","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-communications-networking","tag-linux"],"jetpack_publicize_connections":[],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"https:\/\/quantumsea.net\/wp-content\/uploads\/2026\/10\/qs-udp-datagram-truncation-20261022-featured-8dfdab68c81d.png","_links":{"self":[{"href":"https:\/\/quantumsea.net\/index.php?rest_route=\/wp\/v2\/posts\/1150","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=1150"}],"version-history":[{"count":1,"href":"https:\/\/quantumsea.net\/index.php?rest_route=\/wp\/v2\/posts\/1150\/revisions"}],"predecessor-version":[{"id":1155,"href":"https:\/\/quantumsea.net\/index.php?rest_route=\/wp\/v2\/posts\/1150\/revisions\/1155"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/quantumsea.net\/index.php?rest_route=\/wp\/v2\/media\/1148"}],"wp:attachment":[{"href":"https:\/\/quantumsea.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1150"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/quantumsea.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1150"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/quantumsea.net\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1150"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}