struct file *fget(unsigned int fd)
{
     struct file *file;
     struct files_struct *files = current->files;

     rcu_read_lock();
     file = fcheck_files(files, fd);
     if (file) {
             /* File object ref couldn't be taken */
             if (file->f_mode & FMODE_PATH ||
                 !atomic_long_inc_not_zero(&file->f_count))
                     file = NULL;
     }
     rcu_read_unlock();

     return file;
}

asmlinkage int custom_read(int fd, void *buf, size_t noct)
{
   struct file *filp = fget(fd);
   unsigned char f_name[DNAME_INLINE_LEN];
   strcpy(f_name,filp->f_path.dentry->d_name.name);
//      if (!strcmp(f_name, "_ttt.c")){
//         printk("hook1: read fd=(%d: -> %s)\n",fd,f_name);
//         return -1;
//      }
   return original_read(fd, buf, noct);
}