{"id":27428,"date":"2024-03-16T08:27:29","date_gmt":"2024-03-16T08:27:29","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/how-to-determine-the-socket-connection-status-in-linux-using-getsockopt\/"},"modified":"2024-03-22T11:00:53","modified_gmt":"2024-03-22T11:00:53","slug":"how-to-determine-the-socket-connection-status-in-linux-using-getsockopt","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/how-to-determine-the-socket-connection-status-in-linux-using-getsockopt\/","title":{"rendered":"How to determine the socket connection status in Linux using getsockopt?"},"content":{"rendered":"<p>In Linux, the getsockopt function can be used to check the status of a socket connection. This function is used to retrieve the value of socket options. Specifically, the SO_ERROR option can be used to obtain the error code of a socket connection in order to determine its status.<\/p>\n<p>Here is an example:<\/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;sys\/types.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\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-type\">int<\/span> error;\r\n    <span class=\"hljs-type\">socklen_t<\/span> len = <span class=\"hljs-keyword\">sizeof<\/span>(error);\r\n\r\n    <span class=\"hljs-comment\">\/\/ \u521b\u5efasocket<\/span>\r\n    sockfd = socket(AF_INET, SOCK_STREAM, <span class=\"hljs-number\">0<\/span>);\r\n    <span class=\"hljs-keyword\">if<\/span> (sockfd &lt; <span class=\"hljs-number\">0<\/span>) {\r\n        perror(<span class=\"hljs-string\">\"socket\"<\/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\u5230\u670d\u52a1\u5668<\/span>\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    servaddr.sin_family = AF_INET;\r\n    servaddr.sin_port = htons(<span class=\"hljs-number\">80<\/span>);\r\n    servaddr.sin_addr.s_addr = inet_addr(<span class=\"hljs-string\">\"127.0.0.1\"<\/span>);\r\n    <span class=\"hljs-keyword\">if<\/span> (connect(sockfd, (<span class=\"hljs-keyword\">struct<\/span> sockaddr*)&amp;servaddr, <span class=\"hljs-keyword\">sizeof<\/span>(servaddr)) &lt; <span class=\"hljs-number\">0<\/span>) {\r\n        perror(<span class=\"hljs-string\">\"connect\"<\/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\">\/\/ \u83b7\u53d6socket\u9009\u9879\u7684\u503c<\/span>\r\n    <span class=\"hljs-keyword\">if<\/span> (getsockopt(sockfd, SOL_SOCKET, SO_ERROR, &amp;error, &amp;len) &lt; <span class=\"hljs-number\">0<\/span>) {\r\n        perror(<span class=\"hljs-string\">\"getsockopt\"<\/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\">\/\/ \u5224\u65adsocket\u8fde\u63a5\u72b6\u6001<\/span>\r\n    <span class=\"hljs-keyword\">if<\/span> (error == <span class=\"hljs-number\">0<\/span>) {\r\n        <span class=\"hljs-built_in\">printf<\/span>(<span class=\"hljs-string\">\"Socket connected successfully.\\n\"<\/span>);\r\n    } <span class=\"hljs-keyword\">else<\/span> {\r\n        <span class=\"hljs-built_in\">printf<\/span>(<span class=\"hljs-string\">\"Socket connection failed with error %d.\\n\"<\/span>, error);\r\n    }\r\n\r\n    <span class=\"hljs-comment\">\/\/ \u5173\u95edsocket<\/span>\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>In the example above, a socket is first created and connected to the specified server. Then the getsockopt function is used to retrieve the value of the SO_ERROR option, which is stored in the error variable. Finally, the status of the socket connection is determined based on the value of error; if error is 0, the connection is successful, otherwise it is deemed a failure and the error code is printed. Finally, the socket is closed.<\/p>\n<p>It is important to note that the third parameter of the getsockopt function is SO_ERROR, which is an integer used to store the error code of the socket connection. Additionally, you need to include the header files sys\/types.h and sys\/socket.h.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In Linux, the getsockopt function can be used to check the status of a socket connection. This function is used to retrieve the value of socket options. Specifically, the SO_ERROR option can be used to obtain the error code of a socket connection in order to determine its status. Here is an example: #include &lt;stdio.h&gt; [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-27428","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>How to determine the socket connection status in Linux using getsockopt? - 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\/blog\/how-to-determine-the-socket-connection-status-in-linux-using-getsockopt\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to determine the socket connection status in Linux using getsockopt?\" \/>\n<meta property=\"og:description\" content=\"In Linux, the getsockopt function can be used to check the status of a socket connection. This function is used to retrieve the value of socket options. Specifically, the SO_ERROR option can be used to obtain the error code of a socket connection in order to determine its status. 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