sysctl and _ARRAY_SIZE

• Subject: sysctl and _ARRAY_SIZE
• From: David Burnett <email@hidden>
• Date: Sat, 31 Dec 2005 18:28:41 +0000
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Hi,
I'm try to write some code to determine the amount of
physical memory available to my program. The method I'm
trying to use is...

  double mem_available;

  unsigned int physmem;
  size_t len = sizeof(physmem);
  static int mib[2] = { CTL_HW, HW_PHYSMEM };

  if (sysctl (mib, ARRAY_SIZE (mib), &physmem, &len, NULL, 0) == 0
	      && len == sizeof (physmem)) {
	mem_available = (double )physmem;
  } else {
	fprintf(stderr,
		"warning: unable to determine physical memory.\n");
	mem_available = 2e9;
  }

which compiles fine, but linking I get an error

/usr/bin/ld: Undefined symbols:
_ARRAY_SIZE
collect2: ld returned 1 exit status

Any one know what dylib I'm missing. or know a better
way to do the same thing (either unix or Cocoa).

Dave
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