linux

Linux下copendir如何处理符号链接

小樊
48
2025-08-30 10:07:41
栏目: 智能运维

在Linux下,cop*logdir函数用于复制目录及其内容。当处理符号链接时,cop*logdir默认会复制符号链接本身,而不是链接指向的目标文件或目录。如果你想要复制符号链接指向的目标内容,可以使用cop*logdir2函数。

以下是使用cop*logdircop*logdir2的示例:

  1. 使用cop*logdir复制目录及其内容(包括符号链接本身):
#include <stdio.h>
#include <stdlib.h>
#include <dirent.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>

int main() {
    DIR *dir;
    struct dirent *entry;
    struct stat statbuf;
    char src_path[1024], dest_path[1024];

    dir = opendir(".");
    if (dir == NULL) {
        perror("opendir");
        return 1;
    }

    while ((entry = readdir(dir)) != NULL) {
        snprintf(src_path, sizeof(src_path), "./%s", entry->d_name);
        snprintf(dest_path, sizeof(dest_path), "./dest/%s", entry->d_name);

        if (lstat(src_path, &statbuf) == -1) {
            perror("lstat");
            continue;
        }

        if (S_ISDIR(statbuf.st_mode)) {
            mkdir(dest_path, statbuf.st_mode);
            cop*logdir(src_path, dest_path, NULL);
        } else {
            FILE *src_file = fopen(src_path, "rb");
            FILE *dest_file = fopen(dest_path, "wb");

            if (src_file == NULL || dest_file == NULL) {
                perror("fopen");
                continue;
            }

            char buffer[1024];
            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);
        }
    }

    closedir(dir);
    return 0;
}
  1. 使用cop*logdir2复制目录及其内容(包括符号链接指向的目标内容):
#include <stdio.h>
#include <stdlib.h>
#include <dirent.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>

int main() {
    DIR *dir;
    struct dirent *entry;
    struct stat statbuf;
    char src_path[1024], dest_path[1024];

    dir = opendir(".");
    if (dir == NULL) {
        perror("opendir");
        return 1;
    }

    while ((entry = readdir(dir)) != NULL) {
        snprintf(src_path, sizeof(src_path), "./%s", entry->d_name);
        snprintf(dest_path, sizeof(dest_path), "./dest/%s", entry->d_name);

        if (lstat(src_path, &statbuf) == -1) {
            perror("lstat");
            continue;
        }

        if (S_ISDIR(statbuf.st_mode)) {
            mkdir(dest_path, statbuf.st_mode);
            cop*logdir2(src_path, dest_path, NULL, 0);
        } else {
            FILE *src_file = fopen(src_path, "rb");
            FILE *dest_file = fopen(dest_path, "wb");

            if (src_file == NULL || dest_file == NULL) {
                perror("fopen");
                continue;
            }

            char buffer[1024];
            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);
        }
    }

    closedir(dir);
    return 0;
}

请注意,这些示例仅用于演示目的,实际使用时可能需要根据你的需求进行调整。

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