null_create (const char *name)
{
  struct rw_null *rw = calloc (1, sizeof *rw);
  if (rw == NULL) { perror ("calloc"); exit (EXIT_FAILURE); }

  rw->rw.ops = &null_ops;
  rw->rw.name = name;
  rw->rw.size = INT64_MAX;
  return &rw->rw;
}
null_create (const char *name)
{
  struct rw_null *rw = calloc (1, sizeof *rw);
  if (rw == NULL) { perror ("calloc"); exit (EXIT_FAILURE); }

  rw->rw.ops = &null_ops;
  rw->rw.name = name;
  rw->rw.size = INT64_MAX;
  return &rw->rw;
}