sys_info.h revision c7f5f8508d98d5952d42ed7648c2a8f30a4da156 
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
12class FilePath;
13
14namespace base {
15
16class 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