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 "base/base_export.h"
   9 #include "base/basictypes.h"
  10 #include "base/file_path.h"
  11 #include "base/time.h"
  12
  13 #include <string>
  14
  15 class FilePath;
  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 megabytes of physical memory on the current machine.
  28   static int AmountOfPhysicalMemoryMB() {
  29     return static_cast<int>(AmountOfPhysicalMemory() / 1024 / 1024);
  30   }
  31
  32   // Return the available disk space in bytes on the volume containing |path|,
  33   // or -1 on failure.
  34   static int64 AmountOfFreeDiskSpace(const FilePath& path);
  35
  36   // Returns the name of the host operating system.
  37   static std::string OperatingSystemName();
  38
  39   // Returns the version of the host operating system.
  40   static std::string OperatingSystemVersion();
  41
  42   // Retrieves detailed numeric values for the OS version.
  43   // TODO(port): Implement a Linux version of this method and enable the
  44   // corresponding unit test.
  45   // DON'T USE THIS ON THE MAC OR WINDOWS to determine the current OS release
  46   // for OS version-specific feature checks and workarounds. If you must use
  47   // an OS version check instead of a feature check, use the base::mac::IsOS*
  48   // family from base/mac/mac_util.h, or base::win::GetVersion from
  49   // base/win/windows_version.h.
  50   static void OperatingSystemVersionNumbers(int32* major_version,
  51                                             int32* minor_version,
  52                                             int32* bugfix_version);
  53
  54   // Returns the CPU architecture of the system. Exact return value may differ
  55   // across platforms.
  56   static std::string CPUArchitecture();
  57
  58   // Return the smallest amount of memory (in bytes) which the VM system will
  59   // allocate.
  60   static size_t VMAllocationGranularity();
  61
  62 #if defined(OS_POSIX) && !defined(OS_MACOSX)
  63   // Returns the maximum SysV shared memory segment size.
  64   static size_t MaxSharedMemorySize();
  65 #endif // defined(OS_POSIX) && !defined(OS_MACOSX)
  66
  67 #if defined(OS_CHROMEOS)
  68   // Returns the name of the version entry we wish to look up in the
  69   // Linux Standard Base release information file.
  70   static std::string GetLinuxStandardBaseVersionKey();
  71
  72   // Parses /etc/lsb-release to get version information for Google Chrome OS.
  73   // Declared here so it can be exposed for unit testing.
  74   static void ParseLsbRelease(const std::string& lsb_release,
  75                               int32* major_version,
  76                               int32* minor_version,
  77                               int32* bugfix_version);
  78
  79   // Returns the path to the lsb-release file.
  80   static FilePath GetLsbReleaseFilePath();
  81 #endif // defined(OS_CHROMEOS)
  82
  83 #if defined(OS_ANDROID)
  84   // Returns the Android build's codename.
  85   static std::string GetAndroidBuildCodename();
  86
  87   // Returns the Android build ID.
  88   static std::string GetAndroidBuildID();
  89
  90   // Returns the device's name.
  91   static std::string GetDeviceName();
  92
  93   static int DalvikHeapSizeMB();
  94 #endif // defined(OS_ANDROID)
  95 };
  96
  97 }  // namespace base
  98
  99 #endif  // BASE_SYS_INFO_H_