/*
 * Copyright (C) 2015  Internet Systems Consortium, Inc. ("ISC")
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
 * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
 * PERFORMANCE OF THIS SOFTWARE.
 */

#include <isc/meminfo.h>
#include <unistd.h>
#include <sys/sysctl.h>

isc_uint64_t
isc_meminfo_totalphys(void) {
#if defined(CTL_HW) && (defined(HW_PHYSMEM64) || defined(HW_MEMSIZE))
	int mib[2];
	mib[0] = CTL_HW;
#if defined(HW_MEMSIZE)
	mib[1] = HW_MEMSIZE;
#elif defined(HW_PHYSMEM64)
	mib[1] = HW_PHYSMEM64;
#endif
	isc_uint64_t size = 0;
	size_t len = sizeof(size);
	if (sysctl(mib, 2, &size, &len, NULL, 0) == 0)
		return (size);
#endif
#if defined(_SC_PHYS_PAGES) && defined(_SC_PAGESIZE)
	return ((size_t) (sysconf(_SC_PHYS_PAGES) * sysconf(_SC_PAGESIZE)));
#endif
	return (0);
}