{"id":73177,"date":"2024-03-20T12:40:06","date_gmt":"2024-03-20T03:40:06","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/%e9%9d%9e%e5%90%8c%e6%9c%9f-nonblocking-%e3%81%a7-linux-%e3%82%bd%e3%82%b1%e3%83%83%e3%83%88%e3%82%92%e6%89%b1%e3%81%86%e6%96%b9%e6%b3%95%e3%81%ab%e3%81%a4%e3%81%84%e3%81%a6\/"},"modified":"2025-08-11T01:27:49","modified_gmt":"2025-08-10T16:27:49","slug":"%e9%9d%9e%e5%90%8c%e6%9c%9f-nonblocking-%e3%81%a7-linux-%e3%82%bd%e3%82%b1%e3%83%83%e3%83%88%e3%82%92%e6%89%b1%e3%81%86%e6%96%b9%e6%b3%95%e3%81%ab%e3%81%a4%e3%81%84%e3%81%a6","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/%e9%9d%9e%e5%90%8c%e6%9c%9f-nonblocking-%e3%81%a7-linux-%e3%82%bd%e3%82%b1%e3%83%83%e3%83%88%e3%82%92%e6%89%b1%e3%81%86%e6%96%b9%e6%b3%95%e3%81%ab%e3%81%a4%e3%81%84%e3%81%a6\/","title":{"rendered":"\u975e\u540c\u671f nonblocking \u3067 linux \u30bd\u30b1\u30c3\u30c8\u3092\u6271\u3046\u65b9\u6cd5"},"content":{"rendered":"<p>Linux \u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u3067\u306f\u3001\u30bd\u30b1\u30c3\u30c8\u306e\u975e\u540c\u671f I\/O \u306b\u306f\u6b21\u306e\u3088\u3046\u306a\u65b9\u6cd5\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<ol>\n<li>O_NONBLOCK \u30d5\u30e9\u30b0\u3067\u3001\u30bd\u30b1\u30c3\u30c8\u3092\u975e\u30d6\u30ed\u30c3\u30af\u30e2\u30fc\u30c9\u306b\u8a2d\u5b9a\u3059\u308b:<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><span class=\"hljs-type\">int<\/span> flags = fcntl(socket_fd, F_GETFL, <span class=\"hljs-number\">0<\/span>);\r\nfcntl(socket_fd, F_SETFL, flags | O_NONBLOCK);\r\n<\/code><\/pre>\n<p>\u3053\u306e\u8a2d\u5b9a\u3092\u884c\u3046\u3068\u3001Socket \u306e\u8aad\u307f\u66f8\u304d\u64cd\u4f5c\u306f\u30d6\u30ed\u30c3\u30af\u3055\u308c\u305a\u3001\u3059\u3050\u306b\u8fd4\u3055\u308c\u307e\u3059\u3002<\/p>\n<ol>\n<li>select\u3084poll\u95a2\u6570\u3092\u4f7f\u7528\u3057\u305f\u30de\u30eb\u30c1\u30d7\u30ec\u30af\u30b7\u30f3\u30b0<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code>fd_set read_fds;\r\nFD_ZERO(&amp;read_fds);\r\nFD_SET(socket_fd, &amp;read_fds);\r\n\r\n<span class=\"hljs-class\"><span class=\"hljs-keyword\">struct<\/span> <span class=\"hljs-title\">timeval<\/span> <span class=\"hljs-title\">timeout<\/span>;<\/span>\r\ntimeout.tv_sec = <span class=\"hljs-number\">0<\/span>;\r\ntimeout.tv_usec = <span class=\"hljs-number\">0<\/span>;\r\n\r\n<span class=\"hljs-type\">int<\/span> num_ready = select(socket_fd + <span class=\"hljs-number\">1<\/span>, &amp;read_fds, <span class=\"hljs-literal\">NULL<\/span>, <span class=\"hljs-literal\">NULL<\/span>, &amp;timeout);\r\n<span class=\"hljs-keyword\">if<\/span> (num_ready &gt; <span class=\"hljs-number\">0<\/span> &amp;&amp; FD_ISSET(socket_fd, &amp;read_fds)) {\r\n    <span class=\"hljs-comment\">\/\/ Socket\u6709\u6570\u636e\u53ef\u8bfb<\/span>\r\n}\r\n<\/code><\/pre>\n<p>select\u95a2\u6570\u306f\u8907\u6570\u306e\u30bd\u30b1\u30c3\u30c8\u3092\u76e3\u8996\u3057\u3001\u3044\u305a\u308c\u304b\u306e\u30bd\u30b1\u30c3\u30c8\u306b\u8aad\u307f\u53d6\u308a\u53ef\u80fd\u306a\u30c7\u30fc\u30bf\u304c\u3042\u308b\u3068\u8fd4\u5374\u3057\u3001\u8fd4\u5374\u5f8c\u306b\u9069\u5207\u306a\u51e6\u7406\u3092\u884c\u3046\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<ol>\n<li>epoll\u95a2\u6570\u3092\u5229\u7528\u3057\u305f\u30a4\u30d9\u30f3\u30c8\u99c6\u52d5<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><span class=\"hljs-type\">int<\/span> epoll_fd = epoll_create1(<span class=\"hljs-number\">0<\/span>);\r\n<span class=\"hljs-class\"><span class=\"hljs-keyword\">struct<\/span> <span class=\"hljs-title\">epoll_event<\/span> <span class=\"hljs-title\">event<\/span>;<\/span>\r\nevent.data.fd = socket_fd;\r\nevent.events = EPOLLIN | EPOLLET; <span class=\"hljs-comment\">\/\/ \u76d1\u542c\u53ef\u8bfb\u4e8b\u4ef6\uff0c\u91c7\u7528\u8fb9\u6cbf\u89e6\u53d1\u6a21\u5f0f<\/span>\r\nepoll_ctl(epoll_fd, EPOLL_CTL_ADD, socket_fd, &amp;event);\r\n\r\n<span class=\"hljs-class\"><span class=\"hljs-keyword\">struct<\/span> <span class=\"hljs-title\">epoll_event<\/span> <span class=\"hljs-title\">events<\/span>[<span class=\"hljs-title\">MAX_EVENTS<\/span>];<\/span>\r\n<span class=\"hljs-type\">int<\/span> num_events = epoll_wait(epoll_fd, events, MAX_EVENTS, <span class=\"hljs-number\">0<\/span>);\r\n<span class=\"hljs-keyword\">for<\/span> (<span class=\"hljs-type\">int<\/span> i = <span class=\"hljs-number\">0<\/span>; i &lt; num_events; i++) {\r\n    <span class=\"hljs-keyword\">if<\/span> (events[i].data.fd == socket_fd &amp;&amp; events[i].events &amp; EPOLLIN) {\r\n        <span class=\"hljs-comment\">\/\/ Socket\u6709\u6570\u636e\u53ef\u8bfb<\/span>\r\n    }\r\n}\r\n<\/code><\/pre>\n<p>epoll\u95a2\u6570\u306f\u3001\u30bd\u30b1\u30c3\u30c8\u3092epoll\u76e3\u8996\u96c6\u5408\u306b\u8ffd\u52a0\u3059\u308b\u3053\u3068\u3067\u3001\u30a4\u30d9\u30f3\u30c8\u304c\u767a\u751f\u3057\u305f\u3068\u304d\u306b\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306b\u51e6\u7406\u3092\u901a\u77e5\u3059\u308b\u3001Linux\u72ec\u81ea\u306e\u30cf\u30a4\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9I\/O\u30a4\u30d9\u30f3\u30c8\u901a\u77e5\u30e1\u30ab\u30cb\u30ba\u30e0\u3067\u3059\u3002<\/p>\n<p>Linux\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u3067\u306e\u30bd\u30b1\u30c3\u30c8\u975e\u30d6\u30ed\u30c3\u30ad\u30f3\u30b0\u51e6\u7406\u3092\u5b9f\u73fe\u3059\u308b\u4e00\u822c\u7684\u306a\u624b\u6cd5\u306f\u4ee5\u4e0a\u3067\u3001\u5177\u4f53\u7684\u306a\u30cb\u30fc\u30ba\u306b\u5fdc\u3058\u3066\u9069\u5207\u306a\u624b\u6cd5\u3092\u9078\u629e\u3057\u3066\u5b9f\u88c5\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Linux \u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u3067\u306f\u3001\u30bd\u30b1\u30c3\u30c8\u306e\u975e\u540c\u671f I\/O \u306b\u306f\u6b21\u306e\u3088\u3046\u306a\u65b9\u6cd5\u304c\u3042\u308a\u307e\u3059\u3002 O_NONBLOCK \u30d5\u30e9\u30b0\u3067\u3001\u30bd\u30b1\u30c3\u30c8\u3092\u975e\u30d6\u30ed\u30c3\u30af\u30e2\u30fc\u30c9\u306b\u8a2d\u5b9a\u3059\u308b: int flags = fcntl(socket_fd, F [&hellip;]<\/p>\n","protected":false},"author":12,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[26,61],"class_list":["post-73177","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-26","tag-61"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u975e\u540c\u671f nonblocking \u3067 linux \u30bd\u30b1\u30c3\u30c8\u3092\u6271\u3046\u65b9\u6cd5 - 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