Programmer Think

Virtual File System VFS (Part 2) 9 catalog item object VFS treats directories as files, so in the path / bin/vi, bin and vi belong to files - bin is a special directory file, vi is an ordinary file, and each component in the path is represented by an index node object. Although it can be uniformly represented by index nodes, VFS needs to ofte ...

1 Linux overview 1.1 introduction to Linux operating system architecture Linux operating system is generally composed of Linux kernel and GNU system. Specifically, it is composed of four main parts, namely Linux kernel, Shell, file system and application program. Kernel, Shell and file system constitute the basic structure of the operating sy ...

tc source code analysis II, the location of flow control code in the kernel Kernel version used Linux 4.3 Problem exploration We should study the source code. In addition to being curious about the way the code is written, we are most concerned about the actual logic of the code, so that we can easily understand what is happening inside. Be ...

Abstract: This paper introduces the implementation of LiteOS-M kernel Newlib C, especially the file system and memory allocation release part, and finally introduces the Newlib hook function. This article is shared from Huawei cloud community< Hongmeng light kernel M core source code analysis series 20 Newlib C >, author: zhushy. When ...

Kernel source code compilation For the Jetson board made by yourself, you generally need to modify the device tree and driver, compile, and then replace the kernel image and device tree. Refer to the following Makefile file: make env_ Dependent, installation environment dependentmake download, download the BSP source code (Sources include ...

buddy algorithm is an old module in the kernel, which solves the problem of adjacent physical memory fragmentation, namely "internal fragmentation problem". At the same time, it takes into account the efficiency of memory application and release. Since the introduction of the algorithm, the kernel has been able to complete good luck o ...

0 background The previous blog gave an overview of system calls. Interested partners can check it out: One of Linux system calls -- overview and introduction , here is the main introduction to the system call mechanism. Whether it is GUI (user graphical interface), application program, or command line interface, it needs to be implemented by ...

1. About pathname lookup 1.1 treatment process VFS pathname lookup, that is, how to export the corresponding inode from the file pathname. This process can be briefly described as: check the directory entry matching the first name to obtain the corresponding index node. Then, read the directory file containing that inode from the disk, and ch ...

The previous chapter introduced linux network namespace, and then discussed how to make an independent network namespace communicate with the host network. Here we need to use the linux virtual network device veth. veth equipment veth devices always appear in pairs. They are usually used to connect different network namespaces (hereinafter re ...

Nameless pipe ❤️ ❤️ ❤️ Pipe is also called anonymous pipe. It is the oldest form of IPC (interprocess communication) in UNIX system. All UNIX systems support this communication mechanism.When the parent process calls the pipe function, the kernel will create a cache in the kernel space when executing the pipe function. This cache is the ...