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      1 /*	$NetBSD: meminfo.c,v 1.4 2025/01/26 16:25:37 christos Exp $	*/
      2 
      3 /*
      4  * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
      5  *
      6  * SPDX-License-Identifier: MPL-2.0
      7  *
      8  * This Source Code Form is subject to the terms of the Mozilla Public
      9  * License, v. 2.0. If a copy of the MPL was not distributed with this
     10  * file, you can obtain one at https://mozilla.org/MPL/2.0/.
     11  *
     12  * See the COPYRIGHT file distributed with this work for additional
     13  * information regarding copyright ownership.
     14  */
     15 
     16 #include <inttypes.h>
     17 #include <unistd.h>
     18 
     19 #include <isc/meminfo.h>
     20 #if defined(HAVE_SYS_SYSCTL_H) && !defined(__linux__)
     21 #include <sys/sysctl.h>
     22 #endif /* if defined(HAVE_SYS_SYSCTL_H) && !defined(__linux__) */
     23 
     24 uint64_t
     25 isc_meminfo_totalphys(void) {
     26 #if defined(CTL_HW) && (defined(HW_PHYSMEM64) || defined(HW_MEMSIZE))
     27 	int mib[2];
     28 	mib[0] = CTL_HW;
     29 #if defined(HW_MEMSIZE)
     30 	mib[1] = HW_MEMSIZE;
     31 #elif defined(HW_PHYSMEM64)
     32 	mib[1] = HW_PHYSMEM64;
     33 #endif /* if defined(HW_MEMSIZE) */
     34 	uint64_t size = 0;
     35 	size_t len = sizeof(size);
     36 	if (sysctl(mib, 2, &size, &len, NULL, 0) == 0) {
     37 		return size;
     38 	}
     39 #endif /* if defined(CTL_HW) && (defined(HW_PHYSMEM64) || defined(HW_MEMSIZE)) \
     40 	* */
     41 #if defined(_SC_PHYS_PAGES) && defined(_SC_PAGESIZE)
     42 	long pages = sysconf(_SC_PHYS_PAGES);
     43 	long pagesize = sysconf(_SC_PAGESIZE);
     44 
     45 	if (pages < 0 || pagesize < 0) {
     46 		return 0;
     47 	}
     48 
     49 	return (uint64_t)pages * pagesize;
     50 #endif /* if defined(_SC_PHYS_PAGES) && defined(_SC_PAGESIZE) */
     51 	return 0;
     52 }
     53