Researchers from Kaspersky Lab periodically analyze the popular security technologies in the cybersecurity market. This time, they decided to study what security technologies operating system developers provide for embedded systems (in other words, the Internet of Things). Our main interest lies in how these operating systems address issues related to cybersecurity. Note that during the … Read more
Background Read the fucking source code! –By Lu Xun A picture is worth a thousand words. –By Gorky Note: Kernel version: 4.14 ARM64 processor, Cortex-A53, dual-core Tools used: Source Insight 3.5, Visio 1. Overview In the Linux kernel, real-time processes always have a higher priority than ordinary processes. The scheduling of real-time processes is managed … Read more
(Click the public account above, to quickly follow) Original: Dan Nanni Translation: KayGuoWhu Link: https://linux.cn/article-4326-1.html Nowadays, many system administrators still configure network functions and troubleshoot network issues using command-line tools such as ifconfig, route, arp, and netstat (collectively known as net-tools). Net-tools originated from the BSD TCP/IP toolbox and later became the tool for configuring … Read more
Why TCP/IP Exists All around the world, various computers running different operating systems serve their purposes. However, the methods they use to express the same information can vary greatly. It’s akin to how God confused the languages of people in the Bible, preventing them from cooperating. Computer users realized that individual computers would not be … Read more
Static IP Routing A Simple Routing Table Routing is one of the most important functions at the IP layer. The previous sections have briefly discussed how routers select routes based on the IP addresses of IP packets. We will not repeat that here. First, let’s take a look at a simple system routing table. Destination … Read more
Finally, I have come to the TCP protocol, which is the most important and exciting part of TCP/IP detailed explanation, and it requires significant effort to read. Brief Introduction TCP and UDP are at the same layer— the transport layer. However, the most significant difference between TCP and UDP is that TCP provides a reliable … Read more
Today, I will introduce the core part of Linux networking technology – the TCP/IP protocol stack. First, let’s look at the abstract network protocol stack model. TCP/IP Four-layer (Reference) Model Next, we’ll look at the Linux kernel protocol stack implementation framework from a layered perspective. Top-Down Approach Socket / L4 TCP Layer 1. Socket Layer … Read more
Introduction A few days ago, I saw Teacher Ye using <span>sed</span> to modify the mysqld version number, which I thought was very impressive. However, since this involves restarting the database, many environments may not allow a restart. So what should we do? Approach Previously, when we compiled mysqld, we demonstrated how to modify the version … Read more
Author: Liu Yuwei EET Electronic Engineering Magazine Original Every era has its unique electronic products, and each type of product has its own compatible operating system. For instance, early multitasking operating systems like MULTICS and UNIX, the multi-processor operating systems used in personal computers like LINUX and Windows, and the mobile operating systems of the … Read more
1What is Makefile In the previous study of compiling C programs, we learned that compiling a program is relatively simple. However, if we need to compile multiple files or files in different folders, we need to generate different library files and determine the compilation order of these files, which often requires many complex command lines … Read more