1.1 --- a/GateKeeper.cpp	Sat Nov 12 21:52:41 2016 +0100
     1.2 +++ b/GateKeeper.cpp	Sun Nov 13 08:13:54 2016 +0100
     1.3 @@ -380,15 +380,23 @@
     1.4      void GateKeeper::update_product(product p, DWORD context)
     1.5      {
     1.6  		{
     1.7 -			HANDLE hSemaphore = CreateSemaphore(NULL, 0, 2, _T("PEPINSTALLERSEMAPHORE"));
     1.8 -			DWORD le = GetLastError();
     1.9 -			if (hSemaphore) {
    1.10 -				CloseHandle(hSemaphore);
    1.11 -				if (le == ERROR_ALREADY_EXISTS)
    1.12 -					return;
    1.13 +			const tstring _fileName = _T("\\pEpSetup.lck");
    1.14 +
    1.15 +			unique_ptr < TCHAR[] > _pathName(new TCHAR[MAX_PATH + 1]);
    1.16 +			DWORD size = GetTempPath(MAX_PATH, _pathName.get());
    1.17 +			if (size > MAX_PATH - _fileName.size())
    1.18 +				throw runtime_error("TEMP path too long");
    1.19 +
    1.20 +			tstring fileName(_pathName.get());
    1.21 +			fileName += _fileName;
    1.22 +
    1.23 +			HANDLE file = CreateFile(fileName.c_str(), GENERIC_READ | GENERIC_WRITE, 0, NULL, CREATE_NEW, FILE_ATTRIBUTE_NORMAL, NULL);
    1.24 +			if (file == INVALID_HANDLE_VALUE) {
    1.25 +				return;
    1.26  			}
    1.27  			else {
    1.28 -				return;
    1.29 +				CloseHandle(file);
    1.30 +				DeleteFile(fileName.c_str());
    1.31  			}
    1.32  		}
    1.33