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 // Copyright (c) 2012 The Chromium Authors. All rights reserved.

 // Use of this source code is governed by a BSD-style license that can be

 // found in the LICENSE file.

 #ifndef BASE_SYS_INFO_H_

 #define BASE_SYS_INFO_H_

 #include <string>

 #include "base/base_export.h"

 #include "base/basictypes.h"

 #include "base/files/file_path.h"

 #include "build/build_config.h"

 namespace base {

 class BASE_EXPORT SysInfo {

  public:

   // Return the number of logical processors/cores on the current machine.

   static int NumberOfProcessors();

   // Return the number of bytes of physical memory on the current machine.

   static int64 AmountOfPhysicalMemory();

   // Return the number of bytes of current available physical memory on the

   // machine.

   static int64 AmountOfAvailablePhysicalMemory();

   // Return the number of megabytes of physical memory on the current machine.

   static int AmountOfPhysicalMemoryMB() {

     return static_cast<int>(AmountOfPhysicalMemory() / 1024 / 1024);

   }

   // Return the available disk space in bytes on the volume containing |path|,

   // or -1 on failure.

   static int64 AmountOfFreeDiskSpace(const FilePath& path);

   // Returns system uptime in milliseconds.

   static int64 Uptime();

   // Returns the name of the host operating system.

   static std::string OperatingSystemName();

   // Returns the version of the host operating system.

   static std::string OperatingSystemVersion();

   // Retrieves detailed numeric values for the OS version.

   // TODO(port): Implement a Linux version of this method and enable the

   // corresponding unit test.

   // DON'T USE THIS ON THE MAC OR WINDOWS to determine the current OS release

   // for OS version-specific feature checks and workarounds. If you must use

   // an OS version check instead of a feature check, use the base::mac::IsOS*

   // family from base/mac/mac_util.h, or base::win::GetVersion from

   // base/win/windows_version.h.

   static void OperatingSystemVersionNumbers(int32* major_version,

                                             int32* minor_version,

                                             int32* bugfix_version);

   // Returns the architecture of the running operating system.

   // Exact return value may differ across platforms.

   // e.g. a 32-bit x86 kernel on a 64-bit capable CPU will return "x86",

   //      whereas a x86-64 kernel on the same CPU will return "x86_64"

   static std::string OperatingSystemArchitecture();

   // Avoid using this. Use base/cpu.h to get information about the CPU instead.

   // http://crbug.com/148884

   // Returns the CPU model name of the system. If it can not be figured out,

   // an empty string is returned.

   static std::string CPUModelName();

   // Return the smallest amount of memory (in bytes) which the VM system will

   // allocate.

   static size_t VMAllocationGranularity();

 #if defined(OS_POSIX) && !defined(OS_MACOSX)

   // Returns the maximum SysV shared memory segment size.

   static size_t MaxSharedMemorySize();

 #endif  // defined(OS_POSIX) && !defined(OS_MACOSX)

 #if defined(OS_CHROMEOS)

   // Returns the name of the version entry we wish to look up in the

   // Linux Standard Base release information file.

   static std::string GetLinuxStandardBaseVersionKey();

   // Parses /etc/lsb-release to get version information for Google Chrome OS.

   // Declared here so it can be exposed for unit testing.

   static void ParseLsbRelease(const std::string& lsb_release,

                               int32* major_version,

                               int32* minor_version,

                               int32* bugfix_version);

   // Returns the path to the lsb-release file.

   static FilePath GetLsbReleaseFilePath();

 #endif  // defined(OS_CHROMEOS)

 #if defined(OS_ANDROID)

   // Returns the Android build's codename.

   static std::string GetAndroidBuildCodename();

   // Returns the Android build ID.

   static std::string GetAndroidBuildID();

   // Returns the device's name.

   static std::string GetDeviceName();

   static int DalvikHeapSizeMB();

   static int DalvikHeapGrowthLimitMB();

 #endif  // defined(OS_ANDROID)

 };

 }  // namespace base

 #endif  // BASE_SYS_INFO_H_