Linux中copirdir的实现原理

DIR *dir = opendir(src_path);
if (dir == NULL) {
    perror("opendir");
    return 1;
}

if (mkdir(dest_path, mode) != 0) {
    perror("mkdir");
    closedir(dir);
    return 1;
}

<span>struct dirent *entry;</span>
while ((entry = readdir(dir)) != NULL) {
    // 处理每个条目
}
closedir(dir);

int src_fd = open(src_path, O_RDONLY);
if (src_fd == -1) {
    perror("open source file");
    continue;
}

int dest_fd = open(dest_path, O_WRONLY | O_CREAT, mode);
if (dest_fd == -1) {
    perror("open destination file");
    close(src_fd);
    continue;
}

char buffer[4096];
ssize_t bytes_read, bytes_written;
while ((bytes_read = read(src_fd, buffer, sizeof(buffer))) > 0) {
    bytes_written = write(dest_fd, buffer, bytes_read);
    if (bytes_written != bytes_read) {
        perror("write");
        break;
    }
}

close(src_fd);
close(dest_fd);

if (entry->d_type == DT_DIR) {
    char new_src_path[PATH_MAX];
    char new_dest_path[PATH_MAX];
    snprintf(new_src_path, sizeof(new_src_path), "%s/%s", src_path, entry->d_name);
    snprintf(new_dest_path, sizeof(new_dest_path), "%s/%s", dest_path, entry->d_name);

    if (cp_recursive(new_src_path, new_dest_path, mode) != 0) {
        perror("recursive copy");
    }
}

if (chmod(dest_path, mode) != 0) {
    perror("chmod");
}
if (chown(dest_path, uid, gid) != 0) {
    perror("chown");
}