{"id":96426,"date":"2024-03-21T20:37:26","date_gmt":"2024-03-21T11:37:26","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/linux-%e3%81%a7%e9%9d%9e%e3%83%96%e3%83%ad%e3%83%83%e3%82%ad%e3%83%b3%e3%82%b0%e6%8e%a5%e7%b6%9a%e6%99%82%e3%81%ab%e7%99%ba%e7%94%9f%e3%81%99%e3%82%8b%e3%82%a8%e3%83%a9%e3%83%bc%e3%82%b3%e3%83%bc\/"},"modified":"2024-03-27T02:38:49","modified_gmt":"2024-03-26T17:38:49","slug":"linux-%e3%81%a7%e9%9d%9e%e3%83%96%e3%83%ad%e3%83%83%e3%82%ad%e3%83%b3%e3%82%b0%e6%8e%a5%e7%b6%9a%e6%99%82%e3%81%ab%e7%99%ba%e7%94%9f%e3%81%99%e3%82%8b%e3%82%a8%e3%83%a9%e3%83%bc%e3%82%b3%e3%83%bc","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/linux-%e3%81%a7%e9%9d%9e%e3%83%96%e3%83%ad%e3%83%83%e3%82%ad%e3%83%b3%e3%82%b0%e6%8e%a5%e7%b6%9a%e6%99%82%e3%81%ab%e7%99%ba%e7%94%9f%e3%81%99%e3%82%8b%e3%82%a8%e3%83%a9%e3%83%bc%e3%82%b3%e3%83%bc\/","title":{"rendered":"Linux \u3067\u975e\u30d6\u30ed\u30c3\u30ad\u30f3\u30b0\u63a5\u7d9a\u6642\u306b\u767a\u751f\u3059\u308b\u30a8\u30e9\u30fc\u30b3\u30fc\u30c9 EINPROGRESS \u306e\u5bfe\u51e6\u6cd5"},"content":{"rendered":"<p>\u975e\u30d6\u30ed\u30c3\u30ad\u30f3\u30b0(connect)\u3092\u5229\u7528\u3057\u3066\u3044\u308b\u3068\u304d\u3001\u63a5\u7d9a\u51e6\u7406\u306e\u9032\u884c\u4e2d\u3092\u793a\u3059\u30a8\u30e9\u30fc\u30b3\u30fc\u30c9EINPROGRESS\u304c\u8fd4\u3055\u308c\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u308c\u306f\u975e\u30d6\u30ed\u30c3\u30ad\u30f3\u30b0\u63a5\u7d9a\u304c\u975e\u540c\u671f\u3067\u3042\u308b\u305f\u3081\u3001\u5373\u5ea7\u306b\u8fd4\u5374\u3055\u308c\u3001\u63a5\u7d9a\u51e6\u7406\u306f\u30d0\u30c3\u30af\u30b0\u30e9\u30a6\u30f3\u30c9\u3067\u884c\u308f\u308c\u3066\u3044\u308b\u305f\u3081\u3067\u3059\u3002\u3053\u306e\u554f\u984c\u3092\u89e3\u6c7a\u3059\u308b\u305f\u3081\u306b\u306f\u4ee5\u4e0b\u306e\u3044\u305a\u308c\u304b\u306e\u65b9\u6cd5\u3092\u4f7f\u7528\u3067\u304d\u307e\u3059\u3002<\/p>\n<ol>\n<li>select\u3084epoll\u306a\u3069\u306e\u30de\u30eb\u30c1\u30d7\u30ec\u30af\u30b5\u7cfb\u6280\u8853\u3092\u7528\u3044\u3066\u3001\u63a5\u7d9a\u5b8c\u4e86\u307e\u3067\u5f85\u3064\u3053\u3068\u306b\u3088\u308a\u3001\u63a5\u7d9a\u5b8c\u4e86\u5f8c\u306b\u51e6\u7406\u3092\u7d9a\u884c\u3067\u304d\u307e\u3059\u3002<\/li>\n<li>\u63a5\u7d9a\u304c\u78ba\u7acb\u3057\u3066\u3044\u308b\u304b\u3069\u3046\u304b\u3092\u78ba\u8a8d\u3059\u308b\u306b\u306f\uff08\u975e\u30d6\u30ed\u30c3\u30ad\u30f3\u30b0I\/O\u3092\u4f7f\u7528\u3057\u3066\u3044\u308b\u5834\u5408\uff09\u3001poll\u3084epoll\u306a\u3069\u306e\u95a2\u6570\u3092\u4f7f\u3063\u3066\u3001\u30bd\u30b1\u30c3\u30c8\u306e\u66f8\u304d\u8fbc\u307f\u53ef\u80fd\u30a4\u30d9\u30f3\u30c8\u3092\u8abf\u3079\u308b\u3053\u3068\u3067\u5224\u65ad\u3067\u304d\u307e\u3059\u3002<\/li>\n<li>\u975e\u540c\u671fI\/O\u3092\u4f7f\u7528\u3059\u308b\u5834\u5408\u306b\u306f\u3001connect()\u547c\u3073\u51fa\u3057\u306f\u975e\u540c\u671f\u3067\u884c\u308f\u308c\u3001\u3059\u3050\u306b\u8fd4\u308a\u307e\u3059\u304c\u3001\u305d\u308c\u4ee5\u964d\u306fpoll()\u3084epoll()\u306a\u3069\u306e\u95a2\u6570\u3067\u63a5\u7d9a\u72b6\u614b\u3092\u78ba\u8a8d\u3057\u3066\u3001\u63a5\u7d9a\u304c\u5b8c\u4e86\u3059\u308b\u307e\u3067\u78ba\u8a8d\u3092\u7e70\u308a\u8fd4\u3059\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/li>\n<\/ol>\n<p>\u4ee5\u4e0b\u306f\u3001\u975e\u30d6\u30ed\u30c3\u30ad\u30f3\u30b0connect\u3092\u4f7f\u7528\u3059\u308b\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u3059<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-meta\">#<span class=\"hljs-keyword\">include<\/span> <span class=\"hljs-string\">&lt;stdio.h&gt;<\/span><\/span>\r\n<span class=\"hljs-meta\">#<span class=\"hljs-keyword\">include<\/span> <span class=\"hljs-string\">&lt;unistd.h&gt;<\/span><\/span>\r\n<span class=\"hljs-meta\">#<span class=\"hljs-keyword\">include<\/span> <span class=\"hljs-string\">&lt;fcntl.h&gt;<\/span><\/span>\r\n<span class=\"hljs-meta\">#<span class=\"hljs-keyword\">include<\/span> <span class=\"hljs-string\">&lt;sys\/socket.h&gt;<\/span><\/span>\r\n<span class=\"hljs-meta\">#<span class=\"hljs-keyword\">include<\/span> <span class=\"hljs-string\">&lt;netinet\/in.h&gt;<\/span><\/span>\r\n<span class=\"hljs-meta\">#<span class=\"hljs-keyword\">include<\/span> <span class=\"hljs-string\">&lt;arpa\/inet.h&gt;<\/span><\/span>\r\n<span class=\"hljs-meta\">#<span class=\"hljs-keyword\">include<\/span> <span class=\"hljs-string\">&lt;errno.h&gt;<\/span><\/span>\r\n\r\n<span class=\"hljs-type\">int<\/span> <span class=\"hljs-title function_\">connect_nonblock<\/span><span class=\"hljs-params\">(<span class=\"hljs-type\">int<\/span> sockfd, <span class=\"hljs-type\">const<\/span> <span class=\"hljs-keyword\">struct<\/span> sockaddr *addr, <span class=\"hljs-type\">socklen_t<\/span> addrlen, <span class=\"hljs-type\">int<\/span> timeout)<\/span> {\r\n    <span class=\"hljs-type\">int<\/span> flags, ret;\r\n    fd_set rset, wset;\r\n    <span class=\"hljs-class\"><span class=\"hljs-keyword\">struct<\/span> <span class=\"hljs-title\">timeval<\/span> <span class=\"hljs-title\">tv<\/span>;<\/span>\r\n\r\n    <span class=\"hljs-comment\">\/\/ \u8bbe\u7f6e\u5957\u63a5\u5b57\u4e3a\u975e\u963b\u585e\u6a21\u5f0f<\/span>\r\n    flags = fcntl(sockfd, F_GETFL, <span class=\"hljs-number\">0<\/span>);\r\n    fcntl(sockfd, F_SETFL, flags | O_NONBLOCK);\r\n\r\n    <span class=\"hljs-comment\">\/\/ \u53d1\u8d77\u975e\u963b\u585e\u8fde\u63a5<\/span>\r\n    ret = connect(sockfd, addr, addrlen);\r\n    <span class=\"hljs-keyword\">if<\/span> (ret == <span class=\"hljs-number\">0<\/span>) {\r\n        <span class=\"hljs-comment\">\/\/ \u8fde\u63a5\u6210\u529f\uff0c\u6062\u590d\u5957\u63a5\u5b57\u963b\u585e\u6a21\u5f0f<\/span>\r\n        fcntl(sockfd, F_SETFL, flags);\r\n        <span class=\"hljs-keyword\">return<\/span> ret;\r\n    } <span class=\"hljs-keyword\">else<\/span> <span class=\"hljs-keyword\">if<\/span> (ret &lt; <span class=\"hljs-number\">0<\/span> &amp;&amp; errno != EINPROGRESS) {\r\n        <span class=\"hljs-comment\">\/\/ \u8fde\u63a5\u51fa\u9519<\/span>\r\n        <span class=\"hljs-keyword\">return<\/span> ret;\r\n    }\r\n\r\n    <span class=\"hljs-comment\">\/\/ \u4f7f\u7528select\u7b49\u5f85\u8fde\u63a5\u5b8c\u6210<\/span>\r\n    FD_ZERO(&amp;rset);\r\n    FD_SET(sockfd, &amp;rset);\r\n    wset = rset;\r\n    tv.tv_sec = timeout;\r\n    tv.tv_usec = <span class=\"hljs-number\">0<\/span>;\r\n\r\n    ret = select(sockfd + <span class=\"hljs-number\">1<\/span>, &amp;rset, &amp;wset, <span class=\"hljs-literal\">NULL<\/span>, &amp;tv);\r\n    <span class=\"hljs-keyword\">if<\/span> (ret &lt;= <span class=\"hljs-number\">0<\/span>) {\r\n        <span class=\"hljs-comment\">\/\/ \u8fde\u63a5\u8d85\u65f6\u6216\u51fa\u9519<\/span>\r\n        <span class=\"hljs-keyword\">return<\/span> ret;\r\n    }\r\n\r\n    <span class=\"hljs-keyword\">if<\/span> (FD_ISSET(sockfd, &amp;rset) || FD_ISSET(sockfd, &amp;wset)) {\r\n        <span class=\"hljs-comment\">\/\/ \u8fde\u63a5\u5b8c\u6210\uff0c\u6062\u590d\u5957\u63a5\u5b57\u963b\u585e\u6a21\u5f0f<\/span>\r\n        fcntl(sockfd, F_SETFL, flags);\r\n        <span class=\"hljs-keyword\">return<\/span> ret;\r\n    }\r\n\r\n    <span class=\"hljs-comment\">\/\/ \u8fde\u63a5\u8d85\u65f6<\/span>\r\n    errno = ETIMEDOUT;\r\n    <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-number\">-1<\/span>;\r\n}\r\n\r\n<span class=\"hljs-type\">int<\/span> <span class=\"hljs-title function_\">main<\/span><span class=\"hljs-params\">()<\/span> {\r\n    <span class=\"hljs-type\">int<\/span> sockfd;\r\n    <span class=\"hljs-class\"><span class=\"hljs-keyword\">struct<\/span> <span class=\"hljs-title\">sockaddr_in<\/span> <span class=\"hljs-title\">servaddr<\/span>;<\/span>\r\n\r\n    sockfd = socket(AF_INET, SOCK_STREAM, <span class=\"hljs-number\">0<\/span>);\r\n\r\n    bzero(&amp;servaddr, <span class=\"hljs-keyword\">sizeof<\/span>(servaddr));\r\n    servaddr.sin_family = AF_INET;\r\n    servaddr.sin_port = htons(<span class=\"hljs-number\">80<\/span>);\r\n    inet_pton(AF_INET, <span class=\"hljs-string\">\"127.0.0.1\"<\/span>, &amp;servaddr.sin_addr);\r\n\r\n    <span class=\"hljs-keyword\">if<\/span> (connect_nonblock(sockfd, (<span class=\"hljs-keyword\">struct<\/span> sockaddr *)&amp;servaddr, <span class=\"hljs-keyword\">sizeof<\/span>(servaddr), <span class=\"hljs-number\">5<\/span>) &lt; <span class=\"hljs-number\">0<\/span>) {\r\n        perror(<span class=\"hljs-string\">\"connect_nonblock\"<\/span>);\r\n        <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-number\">-1<\/span>;\r\n    }\r\n\r\n    <span class=\"hljs-comment\">\/\/ \u8fde\u63a5\u5b8c\u6210\uff0c\u8fdb\u884c\u540e\u7eed\u64cd\u4f5c<\/span>\r\n    <span class=\"hljs-comment\">\/\/ ...<\/span>\r\n\r\n    close(sockfd);\r\n\r\n    <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-number\">0<\/span>;\r\n}\r\n<\/code><\/pre>\n<p>select\u306a\u3069\u306e\u30de\u30eb\u30c1\u30d7\u30ec\u30af\u30b5\u306f\u3001\u3053\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u63a5\u7d9a\u5b8c\u4e86\u3092\u5f85\u3064\u306e\u306b\u4f7f\u7528\u3055\u308c\u3066\u3044\u307e\u3059\u304c\u3001\u4ed6\u306e\u30cb\u30fc\u30ba\u306b\u57fa\u3065\u3044\u3066\u3001\u7f6e\u304d\u63db\u3048\u308b\u305f\u3081\u306b\u4ed6\u306e\u30de\u30eb\u30c1\u30d7\u30ec\u30af\u30b5\u6280\u8853\u3092\u9078\u629e\u3067\u304d\u307e\u3059\u3002connect_nonblock\u3067\u306f\u3001\u30bd\u30b1\u30c3\u30c8\u306f\u30ce\u30f3\u30d6\u30ed\u30c3\u30ad\u30f3\u30b0\u30e2\u30fc\u30c9\u306b\u8a2d\u5b9a\u3055\u308c\u3001\u30ce\u30f3\u30d6\u30ed\u30c3\u30ad\u30f3\u30b0\u63a5\u7d9a\u304c\u958b\u59cb\u3055\u308c\u307e\u3059\u3002\u63a5\u7d9a\u304c\u6210\u529f\u3059\u308b\u3068\u3001\u30bd\u30b1\u30c3\u30c8\u306f\u30d6\u30ed\u30c3\u30ad\u30f3\u30b0\u30e2\u30fc\u30c9\u306b\u5fa9\u5e30\u3057\u3001\u623b\u308a\u307e\u3059\u3002\u63a5\u7d9a\u306b\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u305f\u5834\u5408\u306f\u3001\u30a8\u30e9\u30fc\u30b3\u30fc\u30c9\u304c\u76f4\u63a5\u8fd4\u3055\u308c\u307e\u3059\u3002\u63a5\u7d9a\u304c\u5b8c\u4e86\u3057\u3066\u3044\u306a\u3044\u5834\u5408\u3001select\u306f\u63a5\u7d9a\u5b8c\u4e86\u3092\u5f85\u3063\u3066\u304b\u3089\u30bd\u30b1\u30c3\u30c8\u3092\u30d6\u30ed\u30c3\u30ad\u30f3\u30b0\u30e2\u30fc\u30c9\u306b\u5fa9\u5e30\u3057\u3001\u623b\u3057\u307e\u3059\u3002\u63a5\u7d9a\u304c\u30bf\u30a4\u30e0\u30a2\u30a6\u30c8\u3057\u305f\u5834\u5408\u306f\u3001NSError ETIMEDOUT\u304c\u8fd4\u3055\u308c\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u975e\u30d6\u30ed\u30c3\u30ad\u30f3\u30b0(connect)\u3092\u5229\u7528\u3057\u3066\u3044\u308b\u3068\u304d\u3001\u63a5\u7d9a\u51e6\u7406\u306e\u9032\u884c\u4e2d\u3092\u793a\u3059\u30a8\u30e9\u30fc\u30b3\u30fc\u30c9EINPROGRESS\u304c\u8fd4\u3055\u308c\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u308c\u306f\u975e\u30d6\u30ed\u30c3\u30ad\u30f3\u30b0\u63a5\u7d9a\u304c\u975e\u540c\u671f\u3067\u3042\u308b\u305f\u3081\u3001\u5373\u5ea7\u306b\u8fd4\u5374\u3055\u308c\u3001\u63a5\u7d9a\u51e6\u7406\u306f\u30d0\u30c3\u30af\u30b0\u30e9\u30a6\u30f3 [&hellip;]<\/p>\n","protected":false},"author":12,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-96426","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"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>Linux \u3067\u975e\u30d6\u30ed\u30c3\u30ad\u30f3\u30b0\u63a5\u7d9a\u6642\u306b\u767a\u751f\u3059\u308b\u30a8\u30e9\u30fc\u30b3\u30fc\u30c9 EINPROGRESS \u306e\u5bfe\u51e6\u6cd5 - Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/ja\/blog\/linux-\u3067\u975e\u30d6\u30ed\u30c3\u30ad\u30f3\u30b0\u63a5\u7d9a\u6642\u306b\u767a\u751f\u3059\u308b\u30a8\u30e9\u30fc\u30b3\u30fc\/\" \/>\n<meta property=\"og:locale\" content=\"ja_JP\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Linux \u3067\u975e\u30d6\u30ed\u30c3\u30ad\u30f3\u30b0\u63a5\u7d9a\u6642\u306b\u767a\u751f\u3059\u308b\u30a8\u30e9\u30fc\u30b3\u30fc\u30c9 EINPROGRESS \u306e\u5bfe\u51e6\u6cd5\" \/>\n<meta property=\"og:description\" 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