public Privilege( string privilegeName )
{
if ( privilegeName == null )
{
throw new ArgumentNullException( "privilegeName" );
}
this.luid = LuidFromPrivilege( privilegeName );
}
//
// This routine is a wrapper around a hashtable containing mappings
// of privilege names to luids
//
private static Luid LuidFromPrivilege( string privilege )
{
Luid luid;
luid.LowPart = 0;
luid.HighPart = 0;
//
// Look up the privilege LUID inside the cache
//
try
{
privilegeLock.AcquireReaderLock(Timeout.Infinite);
if ( luids.Contains( privilege ))
{
luid = ( Luid )luids[ privilege ];
privilegeLock.ReleaseReaderLock();
}
else
{
privilegeLock.ReleaseReaderLock();
if ( false == NativeMethods.LookupPrivilegeValue( null, privilege, ref luid ))
{
int error = Marshal.GetLastWin32Error();
if ( error == NativeMethods.ERROR_NOT_ENOUGH_MEMORY )
{
throw new OutOfMemoryException();
}
else if ( error == NativeMethods.ERROR_ACCESS_DENIED )
{
throw new UnauthorizedAccessException( "Caller does not have the rights to look up privilege local unique identifier" );
}
else if ( error == NativeMethods.ERROR_NO_SUCH_PRIVILEGE )
{
throw new ArgumentException(
string.Format( "{0} is not a valid privilege name", privilege ),
"privilege" );
}
else
{
throw new Win32Exception( error );
}
}
privilegeLock.AcquireWriterLock(Timeout.Infinite);
}
}
finally
{
if ( privilegeLock.IsReaderLockHeld )
{
privilegeLock.ReleaseReaderLock();
}
if ( privilegeLock.IsWriterLockHeld )
{
if ( !luids.Contains( privilege ))
{
luids[ privilege ] = luid;
privileges[ luid ] = privilege;
}
privilegeLock.ReleaseWriterLock();
}
}
return luid;
}