windows_version.cc revision ddb351dbec246cf1fab5ec20d2d5520909041de1 
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#include "base/win/windows_version.h"
6
7#include <windows.h>
8
9#include "base/logging.h"
10
11namespace base {
12namespace win {
13
14// static
15OSInfo* OSInfo::GetInstance() {
16  return Singleton<OSInfo>::get();
17}
18
19OSInfo::OSInfo()
20    : version_(VERSION_PRE_XP),
21      architecture_(OTHER_ARCHITECTURE),
22      wow64_status_(GetWOW64StatusForProcess(GetCurrentProcess())) {
23  OSVERSIONINFOEX version_info = { sizeof version_info };
24  GetVersionEx(reinterpret_cast<OSVERSIONINFO*>(&version_info));
25  version_number_.major = version_info.dwMajorVersion;
26  version_number_.minor = version_info.dwMinorVersion;
27  version_number_.build = version_info.dwBuildNumber;
28  if ((version_number_.major == 5) && (version_number_.minor > 0)) {
29    version_ = (version_number_.minor == 1) ? VERSION_XP : VERSION_SERVER_2003;
30  } else if (version_number_.major == 6) {
31    if (version_info.wProductType == VER_NT_WORKSTATION)
32      version_ = (version_number_.minor == 0) ? VERSION_VISTA : VERSION_WIN7;
33    else
34      version_ = VERSION_SERVER_2008;
35  } else if (version_number_.major > 6) {
36    version_ = VERSION_WIN7;
37  }
38  service_pack_.major = version_info.wServicePackMajor;
39  service_pack_.minor = version_info.wServicePackMinor;
40
41  SYSTEM_INFO system_info = { 0 };
42  GetNativeSystemInfo(&system_info);
43  switch (system_info.wProcessorArchitecture) {
44    case PROCESSOR_ARCHITECTURE_INTEL: architecture_ = X86_ARCHITECTURE; break;
45    case PROCESSOR_ARCHITECTURE_AMD64: architecture_ = X64_ARCHITECTURE; break;
46    case PROCESSOR_ARCHITECTURE_IA64:  architecture_ = IA64_ARCHITECTURE; break;
47  }
48  processors_ = system_info.dwNumberOfProcessors;
49  allocation_granularity_ = system_info.dwAllocationGranularity;
50}
51
52OSInfo::~OSInfo() {
53}
54
55// static
56OSInfo::WOW64Status OSInfo::GetWOW64StatusForProcess(HANDLE process_handle) {
57  typedef BOOL (WINAPI* IsWow64ProcessFunc)(HANDLE, PBOOL);
58  IsWow64ProcessFunc is_wow64_process = reinterpret_cast<IsWow64ProcessFunc>(
59      GetProcAddress(GetModuleHandle(L"kernel32.dll"), "IsWow64Process"));
60  if (!is_wow64_process)
61    return WOW64_DISABLED;
62  BOOL is_wow64 = FALSE;
63  if (!(*is_wow64_process)(process_handle, &is_wow64))
64    return WOW64_UNKNOWN;
65  return is_wow64 ? WOW64_ENABLED : WOW64_DISABLED;
66}
67
68Version GetVersion() {
69  return OSInfo::GetInstance()->version();
70}
71
72}  // namespace win
73}  // namespace base
74