Programmer Think

1, Experimental purpose 1. Understand the content of virtual file system in Linux 2. Learn how to write kernel modules 3. Implementation of file operation algorithm in virtual file system / proc 2, Experimental environment Centos7.9，vim 3, Experimental content Write a kernel module, add a directory hello in the / proc file system, and add a fi ...

What is an interrupt interrupt   It is a mechanism to notify the CPU after the external device completes some work (for example, after the hard disk completes the read-write operation, it informs the CPU that it has completed through interrupt). In the early days, computers without interrupt mechanism had to query the status of external d ...

##########1, Features of Selinux############### 1. ObservationWhen Selinux is not turned on The files created in / mnt are moved to / var/ftp and can be accessed by vsftpd service Anonymous users can upload files after setting Displays "? When viewing a file using ls -Z /var/ftp When selinux is on: The files created in / mnt are mov ...

1. Process and memory management Kernel functions: process management, memory management, file system, network function, driver, security function, etc 1.1 what is a process Process: a copy of a running program, a collection of instructions loaded into memory, and a unit of resource allocation The Process ID (PID) number is used to mark ea ...

1.5 Route Linux does not have a direct command brctl like creating a virtual Bridge, and it does not have an indirect command. It cannot create a virtual Router... Because it is a Router! However, Linux does not turn on the routing and forwarding function by default. You can use this command to verify: cat /proc/sys/net/ipv4/ip_forward 0 ...

Linux development is usually coded on Windows, and then the files are transmitted to Linux for compilation. When the project is a little large or multiple people develop at the same time, the whole process will become very cumbersome. If there is a tool that can be implemented, the code written will be synchronized to Linux in real time Samb ...

WeChat official account: operation and development story, author: Jiang Zong Write in front With the rapid development of cloud native era, all walks of life have entered k8s. In just two or three years, recruitment requires "at least one year k8s practical experience". So that many traditional technologies used by many people in ...

7.9 examples Example: generate 10 random numbers, save them in the array, and find their maximum and minimum values [root@rocky8 ~]# vim max_min.sh #!/bin/bash # #********************************************************************************************** #Author: Raymond #QQ: 88563128 #Date: 2021-10-22 #FileName: ...

preface Testers who can test and understand programming are still scarce, and most organizations may not invest in this aspect. Therefore, let ordinary test engineers simply learn to carry out automated testing, which is still in market demand. Before, I was confused that ordinary test engineers could not deeply participate in the case prep ...

How does the Linux kernel load and start an executable program Understand the process of compiling links and ELF executable file format: Creation process of executable file: c code (. c) - after preprocessing by the compiler, compile it into assembly code (. asm) - assembler, generate object code (. o) - linker, link it into executable file ...