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1, Why multithreading? else if(60<xy.x && xy.x<300 && 240<xy.y && xy.y<300)//Enter LCD detection { printf("enter LCD checking\n"); while(1) { lcd_show_color(RED); xy = get_ts_xy();//block else if(700<xy.x && xy.x<800 && 0<xy.y && xy.y<50)// ...

shell programming shell overview The parsers provided by Linux are [root@pihao01 ~]# cat /etc/shells /bin/sh /bin/bash /usr/bin/sh /usr/bin/bash [root@pihao01 ~]# Relationship between bash and sh [root@pihao01 bin]# ll |grep bash -rwxr-xr-x. 1 root root 1219248 Nov 9 2019 bash lrwxrwxrwx. 1 root root 4 Nov 9 2019 sh ...

Disk boot mbr represents the master boot record, located in track 0 and sector 1, with a size of 446 bytes, as shown in the following figure: mbr function: Record the location of grub2 boot files When mbr data is lost, the system will stop starting because the boot partition cannot be found Problem simulation mode [root@localhost Desktop]# ...

Prometheus Deployment Lab Server Assignment host name address Installation package prometheus 192.168.80.1 prometheus-2.27.1.linux-amd64.tar.gz server1 192.168.80.2 node_exporter-1.1.2.linux-amd64.tar.gz server2 192.168.80.3 server3 192.168.80.4 1. Make time synchronization ntpdate ntp1.aliyun. ...

1, Basic measures for account security 1. System account cleaning (1) Set the Shell of the non logged in user to / sbin/nologin           usermod -S /sbin/nologin (2) Lock accounts that have not been used for a long time           usermod-L user name           passwd - | user name   ...

1, What is a drive frame 1. Who wrote the driver (1) Drive development engineer (2) Kernel maintainer 2. Driver programming collaboration requirements (1) The interface should be standardized. Don't make a mess. There are several sets of interfaces (2) Minimize the difficulty of driving developers 3. What is the driver framework (1) The ...

catalogue Working principle and significance of CRTCInitialization and function of CRTC module 0. Introduction CRTC under DRM represents RGB data pipeline from & DRM_ The plane receives the pixel data and mixes them together and transmits them to the lower level display device DRM_ encoder. By & DRM_ display_ Mode controls timin ...

Linux Interrupt Subsystem (3) GIC Interrupt Processing Remarks: _1.Kernel version: 5.4 _2.Use tools: Source Insight 4.0 _3.Reference Blog: Linux interrupt subsystem (1) Interrupt controller and driver analysis Linux Interrupt Subsystem (2) - General Framework Processing Hematemesis | Liver flip Linux interrupts all knowledge points Linux kerne ...

After installing mysql, I found that you can enter MySQL without entering a password. After studying for a long time, I finally found a solution. Step 1: input in the console (modify mysqld.cnf file) sudo vim /etc/mysql/mysql.conf.d/mysqld.cnf Enter the mysqld.cnf configuration file, and then add the sentence skip grant tables in the [mysql ...

Process communication - mmap file memory mapping #include <sys/mman.h> void *mmap(void *addr, size_t length, int prot, int flags, int fd, off_t offset); int munmap(void *addr, size_t length); PROT_EXEC //Pages may be executed. PROT_READ // Pages may be read. PROT_WRITE // Pages may be written. PROT_NONE // Pages may n ...