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
14class FilePath;
15
16namespace base {
17
18class 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