Distinguish symbolic link from file (stat function)

This is a discussion on Distinguish symbolic link from file (stat function) within the C Programming forums, part of the General Programming Boards category; Hi, I'm new to the forum. Sorry fo my bad English I've a problem to distinguish symbolic link from file, ...

  1. #1
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    Distinguish symbolic link from file (stat function)

    Hi, I'm new to the forum. Sorry fo my bad English
    I've a problem to distinguish symbolic link from file, I created a link ("mylink") to a file, but when I run the following code,
    1. On Debian (gcc-4.3), I get that it is a regular file
    2. On Windows (Dev-C++), I get this error: "undefined reference to S_ISLNK"

    Code:
    #include <stdio.h>
    #include <sys/stat.h>
    #include <sys/types.h>
    
    struct stat file;
    int status;
        
    main() {
         status = stat("/home/mario/Desktop/mylink", &file);
         if (S_ISLNK(file.st_mode))
    	  printf("Is a link\n");
         else if (S_ISREG(file.st_mode))
    	  printf("Is a file\n");
    }
    How can I fix the problem?
    Thanks!

  2. #2
    a_capitalist_story
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    Probably because Windows doesn't support symbolic links? And your English is fine.

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    Quote Originally Posted by rags_to_riches View Post
    Probably because Windows doesn't support symbolic links? And your English is fine.
    Why on Debian it is not identified as a link?

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    Because stat() returns information about the file that the link refers to.
    To get information about the symbolic link itself, use the lstat() call.

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    Is there a way to fix the problem on Windows?

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    Quote Originally Posted by mario++ View Post
    Is there a way to fix the problem on Windows?
    Yes, sure. In windows, remove all the code and make it:
    Code:
    printf("Is a file\n");
    As stated before, Windows doesn't support symbolic links. So files are never symbolic links.

  7. #7
    and the hat of sweating
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    Quote Originally Posted by EVOEx View Post
    Yes, sure. In windows, remove all the code and make it:
    Code:
    printf("Is a file\n");
    As stated before, Windows doesn't support symbolic links. So files are never symbolic links.
    I'm sure he's referring to Windows Shortcuts as 'symbolic links' though.
    "I am probably the laziest programmer on the planet, a fact with which anyone who has ever seen my code will agree." - esbo, 11/15/2008

    "the internet is a scary place to be thats why i dont use it much." - billet, 03/17/2010

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    Quote Originally Posted by cpjust View Post
    I'm sure he's referring to Windows Shortcuts as 'symbolic links' though.
    Yes, I'm refferring to Windows Shortcut

  9. #9
    'Allo, 'Allo, Allo
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    Quote Originally Posted by EVOEx View Post
    As stated before, Windows doesn't support symbolic links.
    In the best Botchamania tradition: Huh!? Symbolic Links (Windows)

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    Quote Originally Posted by mario++ View Post
    Yes, I'm refferring to Windows Shortcut
    What I mean: Is it possible to distinguish a Windows Shortcut (.lnk) from a file?

  11. #11
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    Quote Originally Posted by mario++ View Post
    What I mean: Is it possible to distinguish a Windows Shortcut (.lnk) from a file?
    The Windows Shortcut is nothing more than a glorified ini file (last time i checked). It has no special meaning whatsoever on the filesystem unlike the *nix symoblic links.

    Since a Windows Shortcut is recognizable by its extension, you answered your own question.
    Last edited by Florian; 05-07-2010 at 05:29 PM.

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