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git config credential.helper store

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vim /etc/docker/daemon.json

{
"registry-mirrors": [
  "https://ung2thfc.mirror.aliyuncs.com",
  "https://registry.docker-cn.com",
  "http://hub-mirror.c.163.com",
  "https://docker.mirrors.ustc.edu.cn"
 ]

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set ts=4
set softtabstop=4
set shiftwidth=4
set expandtab
set autoindent

set hlsearch
set backspace=2
set autoindent

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curl -fsSL https://get.docker.com -o get-docker.sh bash get-docker.sh

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vim ~/.pip/pip.conf, make sure the ~/.pip directory exists. fill pip.conf with:

[global]
index-url = https://pypi.tuna.tsinghua.edu.cn/simple
[install]
trusted-host = https://pypi.tuna.tsinghua.edu.cn

you can replace the tsinghua mirror with any of:

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1. install snap

sudo apt update
sudo apt install snapd

2. reboot system

sudo reboot

3. install snap core

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compile with debug

gcc yourfile.c -o test -g

debug

1. start gdb with -tui flag so that you can see C source file while debuging.

gdb test -tui

2. enable assembly next line

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#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/init.h> 
#include <linux/fs.h> 
#include <linux/mm.h> 
#include <asm/uaccess.h>

#define MAX_SIZE (PAGE_SIZE * 2)   /* max size mmaped to userspace */
#define DEVICE_NAME "mchar"