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1. Introduction to fork function fork function is a very important function in linux. It can create a new process from an existing process. The new process is a child process and the original process is a parent process. The return value of fork function is as follows: 1. In the parent process, fork returns the PID number of the newly created ...

Some time ago, there was a problem with the company's Android packaging service. The phenomenon is that when uploading the 360 server for reinforcement, it is very likely to get stuck in the upload stage, retry for a long time, and finally fail. I have conducted some troubleshooting and Analysis on this situation, solved this problem, wrote thi ...

Managing environment variables with Modules Official website link: http://modules.sourceforge.net/ Official documents: https://modules.readthedocs.io/en/latest/ 1, What are Modules Typically, users initialize their environment at login by setting environment information for each application they will reference during the session. The Environmen ...

How does the linux kernel finally mount the root file system 1, Past life and present life In kernel_ Kernel will be called in init thread function_ init_ Freeable() function, in the kernel_init_ Prepare will be called in the freeable function_ The namespace () function mounts the root file system. [it's a long way to go, mounting begins!! ...

Container data volume What is a container data volume Review of docker concept Package the application and environment into one image data If the data is in the container, we will delete the container and lose the data! Requirement: data can be persistent Mysql, delete the container, delete the database and run! Requirement: MySQL data ...

1, Principle of topic communication The implementation model of topic communication is complex, as shown in the figure below. The model involves three roles: ROS Master (Manager) Talker (publisher) Listener (subscriber) The ROS Master is responsible for keeping the registered information of Talker and Listener, matching Talker and Listener wi ...

The general usage of Metasploit was described in the previous article, so this article focuses on the commands of the tool. Use it further, and follow and trust me if you are interested Meterpreter System commands: 1,getuid Command: Used to return the captured or running user name on the target machine 2,getpid Command: used to return the curr ...

This part is about Linux kernel timer. Basic concepts System timer: a programmable hardware chip that can generate interrupts at a fixed frequency. Timer interrupt: the interrupt generated by the fixed time cycle of the system timer, in which the interrupt handler is responsible for updating the system time and executing periodic tasks. Dynam ...

Asynchronous notification When using sleep wake and POLL mechanisms, sleep is required. When waiting for an event to occur, the difference between them is that the latter can specify the duration of sleep. What if APP doesn't want to sleep? There are similar methods: when the driver has data, it actively notifies the APP, and the APP executes ...

catalogue Qinheng ch32f103c8t6 (I): Keil5 environment configuration, sample operation and burning Qinheng ch32f103c8t6 (II): Linux PlatformIO environment configuration, sample operation and burning Qinheng ch32f103c8t6 (III): download configuration of PlatformIO DAPLink and WCHLink Burning with DAP link DAP link is an open-source debugging ...