base/sys_info_linux.cc

   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
  15 namespace {
  16
  17 int64 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
  27 int64 AmountOfPhysicalMemory() {
  28   return AmountOfMemory(_SC_PHYS_PAGES);
  29 }
  30
  31 size_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   int64 limit;
  40   if (!base::StringToInt64(contents, &limit)) {
  41     limit = 0;
  42   }
  43   if (limit < 0 ||
  44       static_cast<uint64>(limit) > std::numeric_limits<size_t>::max()) {
  45     limit = 0;
  46   }
  47   DCHECK(limit > 0);
  48   return static_cast<size_t>(limit);
  49 }
  50
  51 base::LazyInstance<
  52     base::internal::LazySysInfoValue<int64, AmountOfPhysicalMemory> >::Leaky
  53     g_lazy_physical_memory = LAZY_INSTANCE_INITIALIZER;
  54 base::LazyInstance<
  55     base::internal::LazySysInfoValue<size_t, MaxSharedMemorySize> >::Leaky
  56     g_lazy_max_shared_memory = LAZY_INSTANCE_INITIALIZER;
  57
  58 }  // namespace
  59
  60 namespace base {
  61
  62 // static
  63 int64 SysInfo::AmountOfAvailablePhysicalMemory() {
  64   return AmountOfMemory(_SC_AVPHYS_PAGES);
  65 }
  66
  67 // static
  68 int64 SysInfo::AmountOfPhysicalMemory() {
  69   return g_lazy_physical_memory.Get().value();
  70 }
  71
  72 // static
  73 size_t SysInfo::MaxSharedMemorySize() {
  74   return g_lazy_max_shared_memory.Get().value();
  75 }
  76
  77 // static
  78 std::string SysInfo::CPUModelName() {
  79 #if defined(OS_CHROMEOS) && defined(ARCH_CPU_ARMEL)
  80   const char kCpuModelPrefix[] = "Hardware";
  81 #else
  82   const char kCpuModelPrefix[] = "model name";
  83 #endif
  84   std::string contents;
  85   ReadFileToString(FilePath("/proc/cpuinfo"), &contents);
  86   DCHECK(!contents.empty());
  87   if (!contents.empty()) {
  88     std::istringstream iss(contents);
  89     std::string line;
  90     while (std::getline(iss, line)) {
  91       if (line.compare(0, strlen(kCpuModelPrefix), kCpuModelPrefix) == 0) {
  92         size_t pos = line.find(": ");
  93         return line.substr(pos + 2);
  94       }
  95     }
  96   }
  97   return std::string();
  98 }
  99
 100 }  // namespace base