How to get the name of the file pointed to by symbolic link

cs

as title,
how do do it in c language?
is there any system function can be invoked?

Thanks

无双

stat  lstat 函数

cs

you might misunderstood my means, what you do is just
to check whether  the file is a symbolic link, but what I
want to know is how to get the file name(including the whole path)
of the file that pointed to by the symbolic link, for example:

the symbolic link  is '/home/cs/temp/test_slink',  and it is
pointed to '/home/cs/share/test', then, in c func, how  do we
know that '/home/cs/temp/test_slink' is pointed to '/home/cs/share/test'?

thanks!

stevenyi

i catch what you mean. but i dont know how to do it

gadfly

U can use readlink.

#ll ee
lrwxrwxrwx    1 gadfly      gadfly             2  3月 20 13:20 ee ->; bb

getlink.c

1. 
   
2. #include <stdio.h>;
   
3. 
   
4. int main()
   
5. {
   
6. 
   
7.         char buf[256];
   
8.         int len;
   
9. 
   
10.         len = readlink("ee", buf, sizeof(buf));
    
11.         if (len >; -1) {
    
12.                 buf[len] = '\0';
    
13.                 printf("ee link from :%s\n", buf);
    
14.         }
    
15.         return 0;
    
16. }
    

复制代码

#gcc -o getlink getlink.c

./getlink
ee link from :bb

cs

thanks gadfly!