jiangzc

/*
https://ext4.wiki.kernel.org/index.php/Ext4_Disk_Layout#Extent_Tree
file:///home/jzc/Desktop/e2fsprogs-1.45.6/doc/aa.html
https://bean-li.github.io/EXT4-packet-meta-blocks/
https://www.cnblogs.com/alantu2018/p/8461272.html
https://ext4.wiki.kernel.org/index.php/Ext4_Metadata_Checksums
https://metebalci.com/blog/a-minimum-complete-tutorial-of-linux-ext4-file-system/
https://wiki.archlinux.org/index.php/ext4
*/

jiangzc

// get sub process's output in parent process using pipe redirection
#include <unistd.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <stdlib.h>
#include <fcntl.h>
#include <error.h>
#define BUFFSIZE 4000

jiangzc

#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>

int **malloc_2d(int row, int col)
{
    if (row < 0 || col < 0)
        return NULL;
    int *array = (int *)malloc(row * col * sizeof(int));
    int **p = (int **)malloc(row * sizeof(int *));

jiangzc

// compile hint: gcc xxx.c -lblkid
#include <unistd.h>
#include <stdio.h>
#include <stdbool.h>
#include <errno.h>
#include <blkid/blkid.h>

int list_ext4_partitions(void)
{
    int res;

jiangzc

// complie hint: gcc xxx.c  -lmount
#include <stdio.h>
#include <unistd.h>
#include <libmount/libmount.h>

int main()
{
    const char *filename;
    struct libmnt_monitor *mn = mnt_new_monitor();

jiangzc

// monitor active window and its pid using X11 lib
// compile hint: install xlib-dev and then use g++ ./xxx.cpp -lX11
#include <X11/Xlib.h>
#include <cstring>
#include <iostream>
#define MAXSTR 1000
using namespace std;

Display *display;
unsigned char *prop;