5 ms·

Too simple ;) void * p; p = talloc(1, NULL); talloc_set_parent(p, p); tfree(p);

• esneider 13y ago
  Yep, you can also do void *p; free(p); free(p); Don't get me wrong, I get where you are going. But C philosophy is that libraries shouldn't do expensive checking to detect programmers' errors.
  • huhtenberg 13y ago
    I'm not going anywhere. Double-free is a known pitfall. People watch for it and a lot of standard libraries have safeguards against it. On the other hand tfree() hangs if a prior call to talloc_set_parent() is passed certain arguments. Just more ammunition to shoot one's own foot. (p, p) might be a degenerate case, but real code will create cyclic references. In such case blaming programmer is the least productive way to handle it.
    • esneider 13y ago
      Fair enough... I thought it would be more difficult/inefficient to check for cyclic hierarchies, but it wasn't. Fixed! Thanks.