Linux kernel auxiliary tool function inventory: analysis and application of container_of macro
Scan and pay attention to learn embedded, learn together, and grow together. The Linux kernel is an independent software. He does not use any C language library. He has implemented many tools and auxiliary tools by himself. This series of articles will take stock of some auxiliary tool functions provided by the kernel. When compiling a driver program for the Linux driver kernel, we can use the tool functions provided by the kernel to easily achieve the target function. The macro definition of macro container_of is very famous, and many articles have analyzed it, but this macro is often seen in the kernel and drivers. The function of this macro is to derive the address of the structure through the address of the structure members and the structure type. li under the toolsincludelinuxkernel.h file of the linux source code
Jul 16, 2024 am 09:38 AM
jdk1.6 for linux 32: Java core programming software, the first step to learn Java well
jdk1.6forlinux32 is the core programming software of Java, the most popular programming language nowadays. It provides Java with a lot of effective content such as running environment, tools, data interpreters and so on. Therefore, if you want to learn Java well, install Linuxjdk6.032 bit (6u24). One step, recommend it to colleagues in need! Introduction to Linuxjdk6.0 32-bit (6u24) JDK (Java Development Kit) is SunMicrosystems' product for java developers. Since the launch of Java, 64-bit linux installation 32-bit jdk red flag linux6.0 tutorial, JDK has become the most widely used JavaSD
Jul 16, 2024 am 04:17 AM
Four ways to execute python system commands
There are several common methods of executing system commands in Python. Note: The following example code runs successfully under Python 3.5. 1. The os.system method os.system(cmd) runs the system command in the sub-terminal, and you can obtain the return information after the command execution and the status returned by the execution >>>importos>>>os.system('date') 2018 4 Sunday, August 8, 19:29:13 CST0# Running status number, 0 means that two lines of results will be returned after correct execution. The first line is the result, and the second line is the execution status information. 2. os.popen method os.popen(cmd ) not only executes orders
Jul 16, 2024 am 02:46 AM
Explore the basics of Linux: the mysteries of hard drives and partitioning techniques
1. Linux basic knowledge points Hard disk drive is a medium that can store a large amount of information resources. The hard drive we usually see is a square and heavy iron box. Although the hard drive is round, after adding some control circuits, it is designed into a round case for easy portability. And the hard disk is really round. I'm not going to lie to you. How else would it be called a disk? Second, what you need to know is that hard drives can be partitioned. You can partition a hard disk into multiple partitions and exit without saving under Linux. It seems that a partition is both a ranking and a tense. What are the partitions called rankings? Today's hard drives are getting larger and larger, storing more and more resources. In order to more reasonably manage the use of hard disk resources and more effectively improve query speed and access quality, we can define hard disks as many
Jul 15, 2024 pm 06:41 PM
What are pipes and named pipes used for in Linux? One article will help you understand
The editor would like to share with you the uses of pipelines and named pipes in Linux. I believe that most people don’t know much about it, so I share this article with you to refer to Linux named pipe cases. I hope you will finish reading this article. There is a lot to gain, let’s find out together below! In Linux, pipe allows you to send the output of one command to another command. Pipes, as their name suggests, redirect the standard output, input, and errors of one process to another process for further processing. The sentence pattern of the "pipeline" (or "unnamed pipeline") command is to add the | character between the two commands: Command-1|Command-2
Jul 15, 2024 pm 06:07 PM
Shell basic command learning
1: Write the shell script vitest.sh#!/bin/bash#Specify what interpreter this script needs to execute echo "HelloWorld!" #The echo command is used to output text to the window 2: Execute the shell script cd into the directory where the file exists chmod +x./test.sh#Enable the script to have execution permissions./test.sh#Execute script 3: Shell variable understanding example: your_name="wangzhi.cn" Note: There cannot be a space between the variable name and the equal sign: (1). The first letter must be the letter (a-z, A-Z) (2). There can be no space in the middle
Jul 15, 2024 pm 03:35 PM
MinGW-w64 C/C++ compiler version introduction and download link
1. Direct link to download MinGW-w64C/C++ compiler resources from the official website: 2. Product introduction There are a total of five versions that can run on Windows. Let’s talk about the differences of each version separately. 1-cygwin: Equivalent to the Linux compatibility layer of Windows. Linux installs gcc, which can run most Linux software environments (not within the scope of discussion) 2-llvm: Another famous compiler clang under Unix systems and Linux systems (some The feature is not supported under Windows, but it is not gcc red flag linux download and is not recommended) 3-w6464devkit: development tool suite including gcc (recommended, other
Jul 15, 2024 pm 03:19 PM
Does the database automatically increment the primary key?
1. Should every table have an auto-incrementing primary key? It does not necessarily mean that auto-incrementing the primary key can speed up the insertion of rows. It has advantages in table space utilization and the fragmentation is not obvious. But for some content, such as queries based on uid that are very frequent and relatively concentrated, if you do not use auto-incrementing the primary key, but use uid+id as the composite primary key, the query efficiency will go up, but insertion and fragmentation will increase. . But if the storage type of the database is SSD, then this problem does not exist. Therefore, in most cases, it is correct for the table to have an auto-incrementing primary key. 2. Is the auto-incrementing primary key business unique? Not necessarily under a single table structure, yes. In the case of multiple tables, not necessarily, certain strategies are required, such as setting different suffixes, the same interval, etc. 3The auto-incrementing primary key is
Jul 12, 2024 pm 06:33 PM
Hospital information management system based on Java: Exploration to improve management efficiency and service quality
Abstract Tomorrow in the 21st century, with the continuous development and progress of society, people's scientific understanding of information has developed from low level to high level, from the original perceptual understanding to rational understanding, and the importance of management work has gradually been People know that scientific management enables accurate, rapid and complete information storage, improves work management efficiency and promotes its development. The paper mainly introduces the clinic information management system, including the current status of the research and the development background involved. Then it also elaborates on the design goals of the system, as well as the system requirements, the entire design plan, and the impact on the system. The design and implementation were also explained in detail. Finally, some specific tests were conducted on the clinic information management system.
Jul 12, 2024 am 11:16 AM
Linux file permissions analysis
Commonly used permissions There are three identities for files in the Linux system u: owner g: group o: other people. These identities commonly have the following permissions for documents: r: read permission. Users can read the contents of the document, such as using cat, more View w: Write permission, the user can edit the document : Set so that the file has the permissions of the file owner during the execution phase, which is equivalent to temporarily possessing the identity of the file owner. A typical file is passwd. If a general user executes the file, the file can obtain root permissions during the execution process. This allows the user's password to be changed.
Jul 12, 2024 am 10:50 AM
Comprehensive analysis of Linux IP configuration: three network connection modes of virtual machines and precautions
Purpose of the preface article: brief, clear, and comprehensive introduction to Linux IP configuration. Notes: The article is long. If you are interested in a certain link, you can click on the table of contents to get straight to the topic. 1. Three network connection modes of virtual machines (common sense) VMnet1 and VMnet8 are two network cards that are virtualized after installing the virtual machine VMware. VMnet1 is a host network card, used to connect to the network in host mode; VMnet8 is a NAT network card, used to connect to the network in NAT mode, but their IP addresses are randomly generated. 1.Bridged bridge mode is like an independent "physical machine" that exists alone in the LAN. It can access any machine in the same LAN.
Jul 11, 2024 pm 10:07 PM
6 ways to communicate between Linux processes
The concept of process is the concept of the operating system. Whenever we execute a program, a process is created for the operating system. In this process, resources are allocated and released. A process can be thought of as an execution of a program. The concept of process communication. Process user spaces are independent of each other and generally cannot access each other. But in many cases, processes need to communicate with each other to complete a certain function of the system. Processes coordinate their behavior by communicating with the kernel and other processes. Application scenarios of process communication Data transmission: One process needs to send its data to another process, and the amount of data sent ranges from one byte to several megabytes. Shared data: Multiple processes want to operate shared data, and one process wants to operate the shared data.
Jul 11, 2024 pm 09:58 PM
Detailed explanation of Linux file system directory structure: root file system and the meaning of common folders
Note from LinuxWiki: This article has not been updated for more than 11 years (4219 days). If you find that the content is outdated or incorrect, please feel free to improve it:) Windows treats the hard disk as several independent partitions: "C drive" and "D drive" Differently, Linux regards the entire file system as a tree, and the bark of this tree is called the root file system Linux port mapping, represented by /. Each partition is accessed as a folder through "Mount". There are many folders in /. This article introduces the meaning of common folders. The directory structure of Linux is indeed relatively complex, but the settings are reasonable and the levels are clear. This article takes FHS2.3 as an example to introduce. Tip: If you like diagrams, you can refer to LinuxToy reprinted
Jul 11, 2024 pm 08:32 PM
How to upload files to image server in Tomcat container on Linux
A recent project requirement is to upload files to a picture server. The picture server is a tomcat container deployed on Linux. The Linux system uploads files. Not much to say about Linux e-books. Just code a tool class. Done: packagecom.supermap.sbsm.util;importcom.jcraft.jsch.Channel;importcom.jcraft.jsch.ChannelSftp;importcom.jcraft.jsch.JSch;importcom.jcraft.jsch.Session;
Jul 11, 2024 pm 06:35 PM
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