Programming VIP

preface Errors and exceptions: Errors and exceptions are errors that occur during program compilation or running. The difference is that exceptions can be caught and handled by developers; Errors generally do not need to be handled by developers (and cannot be handled), such as memory overflow. If exceptions are not handled in time, errors may ...

Catalogue of series articles preface The generation mode of learning process, such as fork(), system(), exec() functions, etcCommunication and synchronization between Linux processes, including pipe, named pipe fifo, semaphore sem, shared memory shm, message queue msg, and signal. Record their learningLearn the thread programming mo ...

Platform: ubuntu 16.04, the kernel version is 4.15.0. Theoretically, any platform can, even android, as long as it can be compiled. Functions to be completed: there may be multiple recording channels in a codec. What should I do if I want to open a channel for recording? Purpose: just like doing a math problem, read the answer once and think ...

1. Background linux time management includes the concepts of clocksource, clockevent, timer, tick, timekeeper and so on. These concepts organically form a complete time code system. Of course, there will be bugs in the code. This paper starts with a bug to deepen the understanding of the theory in practice. Get the time, but crash. 2. Fault p ...

This experiment requires two hosts nodea and nodeb 1. Explanation of dns terms DNS: domain name service 1) About clients: /etc/resolv.conf    ## dns points to file nameserver 172.25.254.117 2) Test: host www.baidu.com       ## Address resolution command dig www.baidu.com      &nbsp ...

1. Basic communication process between client and server in network programming 2. Server and client programming < iterative server > 2.1. Iterative server programming 2.1.1. Command line parameter parsing The server parameter only has the port number. Add a help parameter < - H > to explain the usage of this commandThe co ...

Author: Grey Original address: Use KeepAlived to implement a highly available DR model operating system CentOS 8 Related tools keepalivedipvsadmhttpd preparation Prepare four nodes, as shown in the figure above, Node01 ~ Node04. By default, you will install Linux on VMWare and configure relevant information. If this content is not clear, ...

Linux disk partition preparation in advance The first step is to open the virtual machine and click Edit virtual machine settings Click the Add button Select the hard drive and click next Select SCSI typeSelect create new virtual hard disk Specify the disk size and select the second or third option (remember not to select the first one, ...

brief introduction ftp is the user interface of Internet standard file transfer protocol, which allows users to transfer files with remote network sites Using FTP client to upload files requires an FTP server. This paper mainly introduces the commands related to FTP client uploading. By default, the FTP server has been installed The FTP se ...

Docker introduction What is Docker? When people say "Docker", they usually refer to Docker Engine, which is a client server application, which is controlled by Docker A daemon, a REST API that specifies the interface to interact with the daemon, and a command line interface (CLI) to communicate with the daemon (by encapsulating ...