1// Copyright (c) 2011 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#include "base/sys_info.h"
6
7#include <sys/sysctl.h>
8
9#include "base/logging.h"
10
11namespace base {
12
13int64 SysInfo::AmountOfPhysicalMemory() {
14  int pages, page_size;
15  size_t size = sizeof(pages);
16  sysctlbyname("vm.stats.vm.v_page_count", &pages, &size, NULL, 0);
17  sysctlbyname("vm.stats.vm.v_page_size", &page_size, &size, NULL, 0);
18  if (pages == -1 || page_size == -1) {
19    NOTREACHED();
20    return 0;
21  }
22  return static_cast<int64>(pages) * page_size;
23}
24
25// static
26size_t SysInfo::MaxSharedMemorySize() {
27  size_t limit;
28  size_t size = sizeof(limit);
29  if (sysctlbyname("kern.ipc.shmmax", &limit, &size, NULL, 0) < 0) {
30    NOTREACHED();
31    return 0;
32  }
33  return limit;
34}
35
36}  // namespace base
37