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// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/win/windows_version.h"
#include <windows.h>
#include "base/logging.h"
namespace base {
namespace win {
// static
OSInfo* OSInfo::GetInstance() {
// Note: we don't use the Singleton class because it depends on AtExitManager,
// and it's convenient for other modules to use this classs without it. This
// pattern is copied from gurl.cc.
static OSInfo* info;
if (!info) {
OSInfo* new_info = new OSInfo();
if (InterlockedCompareExchangePointer(
reinterpret_cast<PVOID*>(&info), new_info, NULL)) {
delete new_info;
}
}
return info;
}
OSInfo::OSInfo()
: version_(VERSION_PRE_XP),
architecture_(OTHER_ARCHITECTURE),
wow64_status_(GetWOW64StatusForProcess(GetCurrentProcess())) {
OSVERSIONINFOEX version_info = { sizeof version_info };
GetVersionEx(reinterpret_cast<OSVERSIONINFO*>(&version_info));
version_number_.major = version_info.dwMajorVersion;
version_number_.minor = version_info.dwMinorVersion;
version_number_.build = version_info.dwBuildNumber;
if ((version_number_.major == 5) && (version_number_.minor > 0)) {
version_ = (version_number_.minor == 1) ? VERSION_XP : VERSION_SERVER_2003;
} else if (version_number_.major == 6) {
if (version_info.wProductType == VER_NT_WORKSTATION) {
switch (version_number_.minor) {
case 0:
version_ = VERSION_VISTA;
break;
case 1:
version_ = VERSION_WIN7;
break;
default: // case 2 appears to be win8.
version_ = VERSION_WIN8;
}
} else {
version_ = VERSION_SERVER_2008;
}
} else if (version_number_.major > 6) {
NOTREACHED();
version_ = VERSION_WIN_LAST;
}
service_pack_.major = version_info.wServicePackMajor;
service_pack_.minor = version_info.wServicePackMinor;
SYSTEM_INFO system_info = { 0 };
GetNativeSystemInfo(&system_info);
switch (system_info.wProcessorArchitecture) {
case PROCESSOR_ARCHITECTURE_INTEL: architecture_ = X86_ARCHITECTURE; break;
case PROCESSOR_ARCHITECTURE_AMD64: architecture_ = X64_ARCHITECTURE; break;
case PROCESSOR_ARCHITECTURE_IA64: architecture_ = IA64_ARCHITECTURE; break;
}
processors_ = system_info.dwNumberOfProcessors;
allocation_granularity_ = system_info.dwAllocationGranularity;
}
OSInfo::~OSInfo() {
}
// static
OSInfo::WOW64Status OSInfo::GetWOW64StatusForProcess(HANDLE process_handle) {
typedef BOOL (WINAPI* IsWow64ProcessFunc)(HANDLE, PBOOL);
IsWow64ProcessFunc is_wow64_process = reinterpret_cast<IsWow64ProcessFunc>(
GetProcAddress(GetModuleHandle(L"kernel32.dll"), "IsWow64Process"));
if (!is_wow64_process)
return WOW64_DISABLED;
BOOL is_wow64 = FALSE;
if (!(*is_wow64_process)(process_handle, &is_wow64))
return WOW64_UNKNOWN;
return is_wow64 ? WOW64_ENABLED : WOW64_DISABLED;
}
Version GetVersion() {
return OSInfo::GetInstance()->version();
}
} // namespace win
} // namespace base
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