void FileSort(int fd) {
   size_t ndx, limit;
   int toInsert, temp;

   limit = 0;
   lseek(fd, 0, SEEK_SET);
   while(read(fd, &toInsert, sizeof(int)))
   {
      limit++;
   }


   while(ndx = --limit)
   {
      lseek(fd,limit*sizeof(int),SEEK_SET);
      read(fd,&toInsert, sizeof(int));
      while(ndx-- >= 0)
      {
         lseek(fd, -2, SEEK_CUR);
         read(fd, &temp, sizeof(int));
         if(temp > toInsert)
         {
            lseek(fd, ndx*sizeof(int), SEEK_SET);
            write(fd, &toInsert, sizeof(int));
            lseek(fd,limit*sizeof(int),SEEK_SET);
            write(fd, &temp, sizeof(int));
            toInsert = temp;
         }
      }
   }
}