{"version":"1.0","provider_name":"Blog - Silicon Cloud","provider_url":"https:\/\/www.silicloud.com\/blog","author_name":"Olivia Parker","author_url":"https:\/\/www.silicloud.com\/blog\/author\/oliviaparker\/","title":"What is the usage of getsockopt in Linux?","type":"rich","width":600,"height":338,"html":"<blockquote class=\"wp-embedded-content\" data-secret=\"SNNrbU8Veo\"><a href=\"https:\/\/www.silicloud.com\/blog\/what-is-the-usage-of-getsockopt-in-linux\/\">What is the usage of getsockopt in Linux?<\/a><\/blockquote><iframe sandbox=\"allow-scripts\" security=\"restricted\" src=\"https:\/\/www.silicloud.com\/blog\/what-is-the-usage-of-getsockopt-in-linux\/embed\/#?secret=SNNrbU8Veo\" width=\"600\" height=\"338\" title=\"&#8220;What is the usage of getsockopt in Linux?&#8221; &#8212; Blog - Silicon Cloud\" data-secret=\"SNNrbU8Veo\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\" class=\"wp-embedded-content\"><\/iframe><script type=\"text\/javascript\">\n\/* <![CDATA[ *\/\n\/*! This file is auto-generated *\/\n!function(d,l){\"use strict\";l.querySelector&&d.addEventListener&&\"undefined\"!=typeof URL&&(d.wp=d.wp||{},d.wp.receiveEmbedMessage||(d.wp.receiveEmbedMessage=function(e){var t=e.data;if((t||t.secret||t.message||t.value)&&!\/[^a-zA-Z0-9]\/.test(t.secret)){for(var s,r,n,a=l.querySelectorAll('iframe[data-secret=\"'+t.secret+'\"]'),o=l.querySelectorAll('blockquote[data-secret=\"'+t.secret+'\"]'),c=new RegExp(\"^https?:$\",\"i\"),i=0;i<o.length;i++)o[i].style.display=\"none\";for(i=0;i<a.length;i++)s=a[i],e.source===s.contentWindow&&(s.removeAttribute(\"style\"),\"height\"===t.message?(1e3<(r=parseInt(t.value,10))?r=1e3:~~r<200&&(r=200),s.height=r):\"link\"===t.message&&(r=new URL(s.getAttribute(\"src\")),n=new URL(t.value),c.test(n.protocol))&&n.host===r.host&&l.activeElement===s&&(d.top.location.href=t.value))}},d.addEventListener(\"message\",d.wp.receiveEmbedMessage,!1),l.addEventListener(\"DOMContentLoaded\",function(){for(var e,t,s=l.querySelectorAll(\"iframe.wp-embedded-content\"),r=0;r<s.length;r++)(t=(e=s[r]).getAttribute(\"data-secret\"))||(t=Math.random().toString(36).substring(2,12),e.src+=\"#?secret=\"+t,e.setAttribute(\"data-secret\",t)),e.contentWindow.postMessage({message:\"ready\",secret:t},\"*\")},!1)))}(window,document);\n\/\/# sourceURL=https:\/\/www.silicloud.com\/blog\/wp-includes\/js\/wp-embed.min.js\n\/* ]]> *\/\n<\/script>\n","description":"`getsockopt()` in Linux is a system call function used to retrieve the value of socket options. Its prototype is as follows: #include&nbsp;&lt;sys\/socket.h&gt;int&nbsp;getsockopt(int&nbsp;sockfd,&nbsp;int&nbsp;level,&nbsp;int&nbsp;optname,&nbsp;void&nbsp;*optval,&nbsp;socklen_t&nbsp;*optlen); The meanings of the parameters are as follows: sockfd\uff1a\u5957\u63a5\u5b57\u6587\u4ef6\u63cf\u8ff0\u7b26\uff0c\u6307\u5b9a\u8981\u83b7\u53d6\u9009\u9879\u7684\u5957\u63a5\u5b57\u3002level\uff1a\u9009\u9879\u6240\u5c5e\u7684\u534f\u8bae\u5c42\u7ea7\uff0c\u5e38\u89c1\u7684\u503c\u6709&nbsp;SOL_SOCKET\uff08\u901a\u7528\u5957\u63a5\u5b57\u9009\u9879\uff09\u548c&nbsp;IPPROTO_TCP\uff08TCP\u534f\u8bae\u9009\u9879\uff09\u7b49\u3002optname\uff1a\u9009\u9879\u7684\u540d\u79f0\uff0c\u8868\u793a\u60a8\u8981\u83b7\u53d6\u7684\u5177\u4f53\u9009\u9879\u3002optval\uff1a\u6307\u5411\u5b58\u50a8\u9009\u9879\u503c\u7684\u7f13\u51b2\u533a\u7684\u6307\u9488\u3002optlen\uff1a\u6307\u5411\u4e00\u4e2a\u6574\u6570\u7684\u6307\u9488\uff0c\u7528\u4e8e\u6307\u5b9a\u7f13\u51b2\u533a\u7684\u5927\u5c0f\uff0c\u5e76\u8fd4\u56de\u5b9e\u9645\u9009\u9879\u6570\u636e\u7684\u957f\u5ea6\u3002 The function `getsockopt()` retrieves the current value of the corresponding option by passing the `sockfd`, `level`, and `optname` parameters, and stores it in the [&hellip;]"}