在 Debian 系统中,可以使用 readdir
函数来读取目录内容,并结合其他函数进行目录同步。以下是一个简单的示例,展示如何使用 readdir
进行目录同步:
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安装必要的库: 确保你已经安装了
libncurses5-dev
和libncursesw5-dev
库,这些库提供了readdir
函数所需的头文件和库文件。sudo apt-get update sudo apt-get install libncurses5-dev libncursesw5-dev
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编写目录同步脚本: 下面是一个简单的 C 程序示例,展示如何使用
readdir
函数读取目录内容,并进行目录同步。#include
#include #include #include #include #include void sync_directories(const char *src_dir, const char *dest_dir) { DIR *src_dp = opendir(src_dir); if (!src_dp) { perror("opendir"); return; } struct dirent *entry; while ((entry = readdir(src_dp)) != NULL) { if (strcmp(entry->d_name, ".") == 0 || strcmp(entry->d_name, "..") == 0) { continue; } char src_path[1024], 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 src_stat, dest_stat; if (stat(src_path, &src_stat) == -1) { perror("stat"); continue; } if (S_ISDIR(src_stat.st_mode)) { // Directory exists in source, check if it exists in destination if (access(dest_path, F_OK) == -1) { // Directory does not exist in destination, create it mkdir(dest_path, src_stat.st_mode); } else { // Directory exists in both, sync recursively sync_directories(src_path, dest_path); } } else { // File exists in source, check if it exists in destination if (access(dest_path, F_OK) == -1) { // File does not exist in destination, copy it FILE *src_fp = fopen(src_path, "rb"); FILE *dest_fp = fopen(dest_path, "wb"); if (src_fp && dest_fp) { char buffer[1024]; size_t bytes_read; while ((bytes_read = fread(buffer, 1, sizeof(buffer), src_fp)) > 0) { fwrite(buffer, 1, bytes_read, dest_fp); } fclose(src_fp); fclose(dest_fp); } else { perror("fopen"); } } else { // File exists in both, check if they are the same if (stat(dest_path, &dest_stat) == -1) { perror("stat"); continue; } if (memcmp(src_stat.st_ino, dest_stat.st_ino, sizeof(src_stat.st_ino)) != 0) { // Files are different, copy it FILE *src_fp = fopen(src_path, "rb"); FILE *dest_fp = fopen(dest_path, "wb"); if (src_fp && dest_fp) { char buffer[1024]; size_t bytes_read; while ((bytes_read = fread(buffer, 1, sizeof(buffer), src_fp)) > 0) { fwrite(buffer, 1, bytes_read, dest_fp); } fclose(src_fp); fclose(dest_fp); } else { perror("fopen"); } } } } } closedir(src_dp); } int main(int argc, char *argv[]) { if (argc != 3) { fprintf(stderr, "Usage: %s \n", argv[0]); return 1; } const char *src_dir = argv[1]; const char *dest_dir = argv[2]; sync_directories(src_dir, dest_dir); return 0; } -
编译程序: 使用
gcc
编译上述程序。gcc -o sync_directories sync_directories.c
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运行程序: 运行编译后的程序,传入源目录和目标目录作为参数。
./sync_directories /path/to/source /path/to/destination
这个示例程序会递归地同步源目录和目标目录中的文件和子目录。它会检查文件是否存在、是否相同,并在必要时进行复制或创建目录。请注意,这个示例程序是一个简单的实现,可能需要根据具体需求进行调整和优化。