base/sys_info.h

   1 // Copyright (c) 2012 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 #ifndef BASE_SYS_INFO_H_
   6 #define BASE_SYS_INFO_H_
   7
   8 #include <map>
   9 #include <string>
  10
  11 #include "base/base_export.h"
  12 #include "base/basictypes.h"
  13 #include "base/files/file_path.h"
  14 #include "base/time/time.h"
  15 #include "build/build_config.h"
  16
  17 namespace base {
  18
  19 class BASE_EXPORT SysInfo {
  20  public:
  21   // Return the number of logical processors/cores on the current machine.
  22   static int NumberOfProcessors();
  23
  24   // Return the number of bytes of physical memory on the current machine.
  25   static int64 AmountOfPhysicalMemory();
  26
  27   // Return the number of bytes of current available physical memory on the
  28   // machine.
  29   static int64 AmountOfAvailablePhysicalMemory();
  30
  31   // Return the number of megabytes of physical memory on the current machine.
  32   static int AmountOfPhysicalMemoryMB() {
  33     return static_cast<int>(AmountOfPhysicalMemory() / 1024 / 1024);
  34   }
  35
  36   // Return the available disk space in bytes on the volume containing |path|,
  37   // or -1 on failure.
  38   static int64 AmountOfFreeDiskSpace(const FilePath& path);
  39
  40   // Returns system uptime in milliseconds.
  41   static int64 Uptime();
  42
  43   // Returns the name of the host operating system.
  44   static std::string OperatingSystemName();
  45
  46   // Returns the version of the host operating system.
  47   static std::string OperatingSystemVersion();
  48
  49   // Retrieves detailed numeric values for the OS version.
  50   // TODO(port): Implement a Linux version of this method and enable the
  51   // corresponding unit test.
  52   // DON'T USE THIS ON THE MAC OR WINDOWS to determine the current OS release
  53   // for OS version-specific feature checks and workarounds. If you must use
  54   // an OS version check instead of a feature check, use the base::mac::IsOS*
  55   // family from base/mac/mac_util.h, or base::win::GetVersion from
  56   // base/win/windows_version.h.
  57   static void OperatingSystemVersionNumbers(int32* major_version,
  58                                             int32* minor_version,
  59                                             int32* bugfix_version);
  60
  61   // Returns the architecture of the running operating system.
  62   // Exact return value may differ across platforms.
  63   // e.g. a 32-bit x86 kernel on a 64-bit capable CPU will return "x86",
  64   //      whereas a x86-64 kernel on the same CPU will return "x86_64"
  65   static std::string OperatingSystemArchitecture();
  66
  67   // Avoid using this. Use base/cpu.h to get information about the CPU instead.
  68   // http://crbug.com/148884
  69   // Returns the CPU model name of the system. If it can not be figured out,
  70   // an empty string is returned.
  71   static std::string CPUModelName();
  72
  73   // Return the smallest amount of memory (in bytes) which the VM system will
  74   // allocate.
  75   static size_t VMAllocationGranularity();
  76
  77 #if defined(OS_POSIX) && !defined(OS_MACOSX)
  78   // Returns the maximum SysV shared memory segment size, or zero if there is no
  79   // limit.
  80   static size_t MaxSharedMemorySize();
  81 #endif  // defined(OS_POSIX) && !defined(OS_MACOSX)
  82
  83 #if defined(OS_CHROMEOS)
  84   typedef std::map<std::string, std::string> LsbReleaseMap;
  85
  86   // Returns the contents of /etc/lsb-release as a map.
  87   static const LsbReleaseMap& GetLsbReleaseMap();
  88
  89   // If |key| is present in the LsbReleaseMap, sets |value| and returns true.
  90   static bool GetLsbReleaseValue(const std::string& key, std::string* value);
  91
  92   // Convenience function for GetLsbReleaseValue("CHROMEOS_RELEASE_BOARD",...).
  93   // Returns "unknown" if CHROMEOS_RELEASE_BOARD is not set.
  94   static std::string GetLsbReleaseBoard();
  95
  96   // Returns the creation time of /etc/lsb-release. (Used to get the date and
  97   // time of the Chrome OS build).
  98   static Time GetLsbReleaseTime();
  99
 100   // Returns true when actually running in a Chrome OS environment.
 101   static bool IsRunningOnChromeOS();
 102
 103   // Test method to force re-parsing of lsb-release.
 104   static void SetChromeOSVersionInfoForTest(const std::string& lsb_release,
 105                                             const Time& lsb_release_time);
 106 #endif  // defined(OS_CHROMEOS)
 107
 108 #if defined(OS_ANDROID)
 109   // Returns the Android build's codename.
 110   static std::string GetAndroidBuildCodename();
 111
 112   // Returns the Android build ID.
 113   static std::string GetAndroidBuildID();
 114
 115   // Returns the device's name.
 116   static std::string GetDeviceName();
 117
 118   static int DalvikHeapSizeMB();
 119   static int DalvikHeapGrowthLimitMB();
 120 #endif  // defined(OS_ANDROID)
 121 };
 122
 123 }  // namespace base
 124
 125 #endif  // BASE_SYS_INFO_H_