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      1 // Copyright (c) 2008 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/basictypes.h"
      9 
     10 #include <string>
     11 
     12 class FilePath;
     13 
     14 namespace base {
     15 
     16 class SysInfo {
     17  public:
     18   // Return the number of logical processors/cores on the current machine.
     19   static int NumberOfProcessors();
     20 
     21   // Return the number of bytes of physical memory on the current machine.
     22   static int64 AmountOfPhysicalMemory();
     23 
     24   // Return the number of megabytes of physical memory on the current machine.
     25   static int AmountOfPhysicalMemoryMB() {
     26     return static_cast<int>(AmountOfPhysicalMemory() / 1024 / 1024);
     27   }
     28 
     29   // Return the available disk space in bytes on the volume containing |path|,
     30   // or -1 on failure.
     31   static int64 AmountOfFreeDiskSpace(const FilePath& path);
     32 
     33   // Return true if the given environment variable is defined.
     34   // TODO: find a better place for HasEnvVar.
     35   static bool HasEnvVar(const wchar_t* var);
     36 
     37   // Return the value of the given environment variable
     38   // or an empty string if not defined.
     39   // TODO: find a better place for GetEnvVar.
     40   static std::wstring GetEnvVar(const wchar_t* var);
     41 
     42   // Returns the name of the host operating system.
     43   static std::string OperatingSystemName();
     44 
     45   // Returns the version of the host operating system.
     46   static std::string OperatingSystemVersion();
     47 
     48   // Retrieves detailed numeric values for the OS version.
     49   // TODO(port): Implement a Linux version of this method and enable the
     50   // corresponding unit test.
     51   static void OperatingSystemVersionNumbers(int32 *major_version,
     52                                             int32 *minor_version,
     53                                             int32 *bugfix_version);
     54 
     55   // Returns the CPU architecture of the system. Exact return value may differ
     56   // across platforms.
     57   static std::string CPUArchitecture();
     58 
     59   // Returns the pixel dimensions of the primary display via the
     60   // width and height parameters.
     61   static void GetPrimaryDisplayDimensions(int* width, int* height);
     62 
     63   // Return the number of displays.
     64   static int DisplayCount();
     65 
     66   // Return the smallest amount of memory (in bytes) which the VM system will
     67   // allocate.
     68   static size_t VMAllocationGranularity();
     69 
     70 #if defined(OS_POSIX) && !defined(OS_MACOSX)
     71   // Returns the maximum SysV shared memory segment size.
     72   static size_t MaxSharedMemorySize();
     73 #endif
     74 
     75 #if defined(OS_CHROMEOS)
     76   // Returns the name of the version entry we wish to look up in the
     77   // Linux Standard Base release information file.
     78   static std::string GetLinuxStandardBaseVersionKey();
     79 
     80   // Parses /etc/lsb-release to get version information for Google Chrome OS.
     81   // Declared here so it can be exposed for unit testing.
     82   static void ParseLsbRelease(const std::string& lsb_release,
     83                               int32 *major_version,
     84                               int32 *minor_version,
     85                               int32 *bugfix_version);
     86 #endif
     87 };
     88 
     89 }  // namespace base
     90 
     91 #endif  // BASE_SYS_INFO_H_
     92