{"id":23950,"date":"2024-03-16T02:18:37","date_gmt":"2024-03-16T02:18:37","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/detailed-explanation-of-the-getsockopt-function\/"},"modified":"2024-03-22T02:30:39","modified_gmt":"2024-03-22T02:30:39","slug":"detailed-explanation-of-the-getsockopt-function","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/detailed-explanation-of-the-getsockopt-function\/","title":{"rendered":"Detailed explanation of the getsockopt( ) function"},"content":{"rendered":"<p>The getsockopt() function is used to retrieve the current value of a socket option.<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-type\">int<\/span> <span class=\"hljs-title function_\">getsockopt<\/span><span class=\"hljs-params\">(<span class=\"hljs-type\">int<\/span> sockfd, <span class=\"hljs-type\">int<\/span> level, <span class=\"hljs-type\">int<\/span> optname, <span class=\"hljs-type\">void<\/span> *optval, <span class=\"hljs-type\">socklen_t<\/span> *optlen)<\/span>;\r\n<\/code><\/pre>\n<p>Description of parameters:<\/p>\n<ol>\n<li>sockfd: socket file descriptor.<\/li>\n<li>Level: The protocol layer where the option is located.<\/li>\n<li>option name: name of the option<\/li>\n<li>optval: output parameter, used to store the value of the option.<\/li>\n<li>optlen: Input\/output parameter that specifies the size of the optval buffer and returns the actual length of the obtained option value.<\/li>\n<\/ol>\n<p>Return value:<\/p>\n<ol>\n<li>Success: 0<\/li>\n<li>Failure: -1, and set errno.<\/li>\n<\/ol>\n<p>Common parameters for level and optname:<\/p>\n<ol>\n<li>Options for level SOL_SOCKET:\n<p>&#8211; SO_SNDBUF: Size of the send buffer.<br \/>\n&#8211; SO_RCVBUF: Size of the receive buffer.<br \/>\n&#8211; SO_REUSEADDR: Allowing address reuse.<\/li>\n<li>Options with level IPPROTO_TCP:\n<p>TCP_KEEPIDLE: Timeout time when TCP connection is idle.<br \/>\nTCP_KEEPINTVL: Time interval for TCP keep-alive probes.<br \/>\nTCP_NODELAY: Disable Nagle&#8217;s algorithm.<\/li>\n<\/ol>\n<p>Example code:<\/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\/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;netinet\/tcp.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 = 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-type\">int<\/span> sndbuf;\r\n    <span class=\"hljs-type\">socklen_t<\/span> len = <span class=\"hljs-keyword\">sizeof<\/span>(sndbuf);\r\n    <span class=\"hljs-type\">int<\/span> ret = getsockopt(sockfd, SOL_SOCKET, SO_SNDBUF, &amp;sndbuf, &amp;len);\r\n    <span class=\"hljs-keyword\">if<\/span> (ret == <span class=\"hljs-number\">0<\/span>) {\r\n        <span class=\"hljs-built_in\">printf<\/span>(<span class=\"hljs-string\">\"SO_SNDBUF: %d\\n\"<\/span>, sndbuf);\r\n    } <span class=\"hljs-keyword\">else<\/span> {\r\n        perror(<span class=\"hljs-string\">\"getsockopt\"<\/span>);\r\n    }\r\n    \r\n    <span class=\"hljs-type\">int<\/span> nodelay;\r\n    len = <span class=\"hljs-keyword\">sizeof<\/span>(nodelay);\r\n    ret = getsockopt(sockfd, IPPROTO_TCP, TCP_NODELAY, &amp;nodelay, &amp;len);\r\n    <span class=\"hljs-keyword\">if<\/span> (ret == <span class=\"hljs-number\">0<\/span>) {\r\n        <span class=\"hljs-built_in\">printf<\/span>(<span class=\"hljs-string\">\"TCP_NODELAY: %d\\n\"<\/span>, nodelay);\r\n    } <span class=\"hljs-keyword\">else<\/span> {\r\n        perror(<span class=\"hljs-string\">\"getsockopt\"<\/span>);\r\n    }\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>The above code retrieves the size of the socket&#8217;s sending buffer and the status of disabling the Nagle algorithm.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The getsockopt() function is used to retrieve the current value of a socket option. int getsockopt(int sockfd, int level, int optname, void *optval, socklen_t *optlen); Description of parameters: sockfd: socket file descriptor. Level: The protocol layer where the option is located. option name: name of the option optval: output parameter, used to store the value [&hellip;]<\/p>\n","protected":false},"author":14,"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-23950","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>Detailed explanation of the getsockopt( ) function - 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\/detailed-explanation-of-the-getsockopt-function\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Detailed explanation of the getsockopt( ) function\" \/>\n<meta property=\"og:description\" content=\"The getsockopt() function is used to retrieve the current value of a socket option. int getsockopt(int sockfd, int level, int optname, void *optval, socklen_t *optlen); Description of parameters: sockfd: socket file descriptor. 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