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/*
* Copyright 2009, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef O3D_PLUGIN_WIN_UPDATE_LOCK_H_
#define O3D_PLUGIN_WIN_UPDATE_LOCK_H_
#if !defined(O3D_INTERNAL_PLUGIN)
#include <windows.h>
#include "base/basictypes.h"
namespace update_lock {
const TCHAR kRunningEventName[] =
L"Global\\{AA4817F6-5DB2-482f-92E9-6BD2FF9F3B14}";
class HandleWrapper {
public:
HandleWrapper(HANDLE handle) {
handle_ = handle;
}
~HandleWrapper() {
CloseHandle(handle_);
}
HANDLE handle() {
return handle_;
}
private:
HANDLE handle_;
DISALLOW_IMPLICIT_CONSTRUCTORS(HandleWrapper);
}; // HandleWrapper
// Returns true if the software is currently not running and can be updated.
bool CanUpdate() {
// Look for Global kernel object created when application is running
HandleWrapper running_event(
OpenEvent(EVENT_ALL_ACCESS, FALSE, kRunningEventName));
if (NULL != running_event.handle()) {
return false;
}
return true;
}
// Returns a HANDLE that should be closed when the software is shutting down.
HANDLE LockFromUpdates() {
SECURITY_ATTRIBUTES* security_attributes = NULL;
SECURITY_ATTRIBUTES security_attributes_buffer;
SECURITY_DESCRIPTOR security_descriptor;
ZeroMemory(&security_attributes_buffer, sizeof(security_attributes_buffer));
security_attributes_buffer.nLength = sizeof(security_attributes_buffer);
security_attributes_buffer.bInheritHandle = FALSE;
// initialize the security descriptor and give it a NULL DACL
if (InitializeSecurityDescriptor(&security_descriptor,
SECURITY_DESCRIPTOR_REVISION)) {
if (SetSecurityDescriptorDacl(&security_descriptor, TRUE,
(PACL)NULL, FALSE)) {
security_attributes_buffer.lpSecurityDescriptor = &security_descriptor;
security_attributes = &security_attributes_buffer;
}
}
// An event is used to lock out updates since events are closed by the OS
// if their process dies. So, updates can still happen if an O3D executable
// crashes (as long as all instances of the running event are closed, either
// properly or due to a crash).
return CreateEvent(security_attributes, FALSE, FALSE, kRunningEventName);
}
} // namespace update_lock
#endif // O3D_INTERNAL_PLUGIN
#endif // O3D_PLUGIN_WIN_UPDATE_LOCK_H_
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