Detect Directory Services Restore Mode in code

On a Windows domain controller, how can I verify from code that I am running in 'Directory Services Restore Mode'?

I need开发者_StackOverflow社区 to do this from either Java, C or C++ but other code samples are welcome.

Invoke the Win API function GetSystemMetrics(SM_CLEANBOOT). It gives an int result which can then be interpreted as follows:

• 0 = Running in Normal Mode
• 1 = Running in Safe Mode
• 2 = Running in Safe Mode with Networking
• 3 = Running in Directory Services Restore Mode

An alternative is to inspect the registry at:

HKLM\SYSTEM\CurrentControlSet\Control\SafeBoot\Option\OptionValue

When booting in Safe Mode, this registry key (which doesn't exist when booted normally) will contain a DWORD value that corresponds to the above values.

If the option value is 1 then only services and drivers specified under

HKLM\SYSTEM\CurrentControlSet\Control\SafeBoot\Minimal

will be loaded. Likewise if the value is 2 then only services and drivers specified under

HKLM\SYSTEM\CurrentControlSet\Control\SafeBoot\Network

will be loaded