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 <limits>
8
9#include "base/files/file_util.h"
10#include "base/lazy_instance.h"
11#include "base/logging.h"
12#include "base/strings/string_number_conversions.h"
13#include "base/sys_info_internal.h"
14
15namespace {
16
17int64 AmountOfMemory(int pages_name) {
18  long pages = sysconf(pages_name);
19  long page_size = sysconf(_SC_PAGESIZE);
20  if (pages == -1 || page_size == -1) {
21    NOTREACHED();
22    return 0;
23  }
24  return static_cast<int64>(pages) * page_size;
25}
26
27int64 AmountOfPhysicalMemory() {
28  return AmountOfMemory(_SC_PHYS_PAGES);
29}
30
31size_t MaxSharedMemorySize() {
32  std::string contents;
33  base::ReadFileToString(base::FilePath("/proc/sys/kernel/shmmax"), &contents);
34  DCHECK(!contents.empty());
35  if (!contents.empty() && contents[contents.length() - 1] == '\n') {
36    contents.erase(contents.length() - 1);
37  }
38
39  uint64 limit;
40  if (!base::StringToUint64(contents, &limit)) {
41    limit = 0;
42  }
43  if (limit > std::numeric_limits<size_t>::max()) {
44    limit = 0;
45  }
46  DCHECK(limit > 0);
47  return static_cast<size_t>(limit);
48}
49
50base::LazyInstance<
51    base::internal::LazySysInfoValue<int64, AmountOfPhysicalMemory> >::Leaky
52    g_lazy_physical_memory = LAZY_INSTANCE_INITIALIZER;
53base::LazyInstance<
54    base::internal::LazySysInfoValue<size_t, MaxSharedMemorySize> >::Leaky
55    g_lazy_max_shared_memory = LAZY_INSTANCE_INITIALIZER;
56
57}  // namespace
58
59namespace base {
60
61// static
62int64 SysInfo::AmountOfAvailablePhysicalMemory() {
63  return AmountOfMemory(_SC_AVPHYS_PAGES);
64}
65
66// static
67int64 SysInfo::AmountOfPhysicalMemory() {
68  return g_lazy_physical_memory.Get().value();
69}
70
71// static
72size_t SysInfo::MaxSharedMemorySize() {
73  return g_lazy_max_shared_memory.Get().value();
74}
75
76// static
77std::string SysInfo::CPUModelName() {
78#if defined(OS_CHROMEOS) && defined(ARCH_CPU_ARMEL)
79  const char kCpuModelPrefix[] = "Hardware";
80#else
81  const char kCpuModelPrefix[] = "model name";
82#endif
83  std::string contents;
84  ReadFileToString(FilePath("/proc/cpuinfo"), &contents);
85  DCHECK(!contents.empty());
86  if (!contents.empty()) {
87    std::istringstream iss(contents);
88    std::string line;
89    while (std::getline(iss, line)) {
90      if (line.compare(0, strlen(kCpuModelPrefix), kCpuModelPrefix) == 0) {
91        size_t pos = line.find(": ");
92        return line.substr(pos + 2);
93      }
94    }
95  }
96  return std::string();
97}
98
99}  // namespace base
100