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      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 #ifndef BASE_SYS_INFO_H_
      6 #define BASE_SYS_INFO_H_
      7 #pragma once
      8 
      9 #include "base/base_api.h"
     10 #include "base/basictypes.h"
     11 
     12 #include <string>
     13 
     14 class FilePath;
     15 
     16 namespace base {
     17 
     18 class BASE_API SysInfo {
     19  public:
     20   // Return the number of logical processors/cores on the current machine.
     21   static int NumberOfProcessors();
     22 
     23   // Return the number of bytes of physical memory on the current machine.
     24   static int64 AmountOfPhysicalMemory();
     25 
     26   // Return the number of megabytes of physical memory on the current machine.
     27   static int AmountOfPhysicalMemoryMB() {
     28     return static_cast<int>(AmountOfPhysicalMemory() / 1024 / 1024);
     29   }
     30 
     31   // Return the available disk space in bytes on the volume containing |path|,
     32   // or -1 on failure.
     33   static int64 AmountOfFreeDiskSpace(const FilePath& path);
     34 
     35   // Returns the name of the host operating system.
     36   static std::string OperatingSystemName();
     37 
     38   // Returns the version of the host operating system.
     39   static std::string OperatingSystemVersion();
     40 
     41   // Retrieves detailed numeric values for the OS version.
     42   // TODO(port): Implement a Linux version of this method and enable the
     43   // corresponding unit test.
     44   static void OperatingSystemVersionNumbers(int32* major_version,
     45                                             int32* minor_version,
     46                                             int32* bugfix_version);
     47 
     48   // Returns the CPU architecture of the system. Exact return value may differ
     49   // across platforms.
     50   static std::string CPUArchitecture();
     51 
     52   // Returns the pixel dimensions of the primary display via the
     53   // width and height parameters.
     54   static void GetPrimaryDisplayDimensions(int* width, int* height);
     55 
     56   // Return the number of displays.
     57   static int DisplayCount();
     58 
     59   // Return the smallest amount of memory (in bytes) which the VM system will
     60   // allocate.
     61   static size_t VMAllocationGranularity();
     62 
     63 #if defined(OS_POSIX) && !defined(OS_MACOSX)
     64   // Returns the maximum SysV shared memory segment size.
     65   static size_t MaxSharedMemorySize();
     66 #endif
     67 
     68 #if defined(OS_CHROMEOS)
     69   // Returns the name of the version entry we wish to look up in the
     70   // Linux Standard Base release information file.
     71   static std::string GetLinuxStandardBaseVersionKey();
     72 
     73   // Parses /etc/lsb-release to get version information for Google Chrome OS.
     74   // Declared here so it can be exposed for unit testing.
     75   static void ParseLsbRelease(const std::string& lsb_release,
     76                               int32* major_version,
     77                               int32* minor_version,
     78                               int32* bugfix_version);
     79 #endif
     80 };
     81 
     82 }  // namespace base
     83 
     84 #endif  // BASE_SYS_INFO_H_
     85