如何在Debian中使用readdir进行数据备份

在Debian系统中，使用readdir函数进行数据备份通常涉及编写一个程序来遍历文件系统目录并复制文件。readdir是C语言标准库中的一个函数，用于读取目录流中的条目。以下是一个简单的示例，展示如何使用readdir进行数据备份：

安装必要的开发工具和库：确保你已经安装了GCC编译器和必要的开发库。你可以使用以下命令安装它们：
```
sudo apt update
sudo apt install build-essential
```

编写C程序：创建一个C程序来遍历源目录并将文件复制到目标目录。以下是一个简单的示例程序：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <dirent.h>
#include <sys/stat.h>
#include <unistd.h>
#include <sys/types.h>

void copy_file(const char *src, const char *dest) {
    FILE *src_file = fopen(src, "rb");
    FILE *dest_file = fopen(dest, "wb");
    if (!src_file || !dest_file) {
        perror("Failed to open file");
        return;
    }
    char buffer[4096];
    size_t bytes_read;
    while ((bytes_read = fread(buffer, 1, sizeof(buffer), src_file)) > 0) {
        fwrite(buffer, 1, bytes_read, dest_file);
    }
    fclose(src_file);
    fclose(dest_file);
}

void backup_directory(const char *src_dir, const char *dest_dir) {
    struct dirent *entry;
    DIR *dp = opendir(src_dir);
    if (!dp) {
        perror("Failed to open directory");
        return;
    }

    // Create destination directory if it doesn't exist
    mkdir(dest_dir, 0755);

    while ((entry = readdir(dp)) != NULL) {
        if (strcmp(entry->d_name, ".") == 0 || strcmp(entry->d_name, "..") == 0) {
            continue;
        }

        char src_path[1024];
        char dest_path[1024];
        snprintf(src_path, sizeof(src_path), "%s/%s", src_dir, entry->d_name);
        snprintf(dest_path, sizeof(dest_path), "%s/%s", dest_dir, entry->d_name);

        struct stat st;
        if (stat(src_path, &st) == -1) {
            perror("Failed to get file status");
            continue;
        }

        if (S_ISDIR(st.st_mode)) {
            backup_directory(src_path, dest_path);
        } else {
            copy_file(src_path, dest_path);
        }
    }

    closedir(dp);
}

int main(int argc, char *argv[]) {
    if (argc != 3) {
        fprintf(stderr, "Usage: %s <source_directory> <destination_directory>\n", argv[0]);
        return 1;
    }

    const char *src_dir = argv[1];
    const char *dest_dir = argv[2];

    backup_directory(src_dir, dest_dir);

    return 0;
}

编译程序：使用GCC编译上述程序：

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