#define _XOPEN_SOURCE 500
    #include <ftw.h>
    #include <stdio.h>
 
    static int display_info(const char *fpath, const struct stat *sb, int tflag, struct FTW *ftwbuf)
    {
        switch(tflag)
        {
            case FTW_D: case FTW_DP: puts(fpath); break;
        }
        return 0; /* To tell nftw() to continue */
    }
 
    int main(int argc, char *argv[])
    {
        int flags = FTW_DEPTH | FTW_MOUNT | FTW_PHYS;
 
        if (argc>1 && nftw(argv[1], display_info, 20, flags) == -1)
            perror("nftw");
    }
 

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