如何确定使用stat（）文件是否是符号链接？

I basically have to write a clone of the UNIX ls command for a class, and I've got almost everything working. One thing I can't seem to figure out how to do is check whether a file is a symbolic link or not. From the man page for stat(), I see that there is a mode_t value defined, S_IFLNK.

我基本上必须为一个类编写一个UNIX ls命令的克隆，而且几乎所有东西都在工作。我似乎无法弄清楚如何做的一件事是检查文件是否是符号链接。从stat（）的手册页中，我看到定义了一个mode_t值，S_IFLNK。

This is how I'm trying to check whether a file is a sym-link, with no luck (note, stbuf is the buffer that stat() returned the inode data into):

这就是我试图检查一个文件是否是一个sym-link，没有运气（注意，stbuf是stat（）返回inode数据的缓冲区）：

switch(stbuf.st_mode & S_IFMT){
    case S_IFLNK:
        printf("this is a link\n");
        break;
    case S_IFREG:
        printf("this is not a link\n");
        break;
}

My code ALWAYS prints this is not a link even if it is, and I know for a fact that the said file is a symbolic link since the actual ls command says so, plus I created the sym-link...

我的代码ALWAYS打印这不是一个链接，即使它是，并且我知道一个事实，所述文件是一个符号链接，因为实际的ls命令这样说，再加上我创建了sym-link ...

Can anyone spot what I may be doing wrong? Thanks for the help!

谁能发现我可能做错了什么？谢谢您的帮助！

1 个解决方案

#1

You can't.

你不能。

You need to use lstat() to stat the link itself, plain stat() will follow the link, and thus never "see" the link itself.

你需要使用lstat（）来统计链接本身，plain stat（）将跟随链接，因此永远不会“看到”链接本身。

#1