Use of NSZoneStat()

[amon]

I am trying to get a handle on storage leaks and NSZoneStat()
would be ideal... except it doesn't work.

  NSZone *dftzone = NSDefaultMallocZone();
  NSZone *curzone = NSZoneFromPointer ( (void *) arglist);
  printf ("dft = %lx cur  = %lx\n",
          (long unsigned int) dftzone,
          (long unsigned int) curzone);

  struct NSZoneStats zs0 = NSZoneStats (dftzone);
  printf ("Bytes Used %d Free %d\n",
          (int) zs0.bytes_used,
          (int) zs0.bytes_free);

dft = 7ffcfdf26200 cur  = 7ffcfdf26200
bin/gpstest: Uncaught exception NSGenericException, reason: No 
statistics for default zone

--
+---------------------------------------------------------------+
|   Dale Amon                  Immortal Data                    |
|   CEO             Midland International Air and Space Port    |
| amon@vnl.com       "Data Systems for Deep Space and Time"     |
+---------------------------------------------------------------+