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List: cygwin-patches
Subject: Re: [Patch] Allow access to /proc/registry/HKEY_PERFORMANCE_DATA
From: Christian Franke <Christian.Franke () t-online ! de>
Date: 2008-12-19 17:35:54
Message-ID: 494BDB7A.4000103 () t-online ! de
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Chris January wrote:
> On Fri, Dec 19, 2008 at 1:58 PM, Christian Franke wrote:
>
>> (fhandler_registry::fill_filebuf): Use larger buffer to speed up
>> access to HKEY_PERFORMANCE_DATA values. Remove check for possible
>> subkey. Add RegCloseKey ().
>>
>
> + /* RegQueryValueEx () opens HKEY_PERFORMANCE_DATA. */
> + RegCloseKey (handle);
>
> I'm slightly puzzled by this change. handle is usually closed in
> fhandler_register::close. If you close it here then won't CloseHandle
> be called with an invalid handle in that method?
>
>
fhandler_registry::close() closes only handles < HKEY_CLASSES_ROOT.
Normally, it is not necessary to close predefined keys.
HKEY_PERFORMANCE_DATA is an exception: It has no subkeys and access to a
value opens the predefined key. Therefore, the key is closed immediately
after value access. Doing this in close() would require to pass a new
'key_is_open' flag from fill_filebuf().
Christian
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