Problem with ksycoca on windows

[Christian Ehrlicher]

> Von: Jaroslaw Staniek
> Christian Ehrlicher said the following, On 2008-02-08 07:11:
> 
> > I've a problem on windows - when ksycoca is running / the db is open, I
> > can't execute kbuildsycoca to update the db. The problem is that
> > kbuildsycoca can't overwrite an open file on windows.
> 
> Interesting that I've even complained on this during the kdepim meeting :)
> 
> Look at src/corelib/io/qfsfileengine_win.cpp:
> bool QFSFileEnginePrivate::nativeOpen(QIODevice::OpenMode openMode)
> {
> /...
>      // All files are opened in share mode (both read and write).
>      DWORD shareMode = FILE_SHARE_READ | FILE_SHARE_WRITE;
> 
> 
> So... we perhaps lack FILE_SHARE_DELETE flag here...
> 
> If we need that, we could patch Qt (and request accepting the patch by TT)
> to 
> add support for FILE_SHARE_DELETE semantics.
> 
> See also: [1] http://mg.to/2004/09/30/file_share_delete-in-shell-extension
> 
> 
> > There're two solutions
> > - let kbuildsycoca create ksyscoca.new and rename the file when db is
> closed
> 
> Good idea; Unless I have oversimplified that, as mentioned in [1], with 
> FILE_SHARE_DELETE flag the processes will still use the old file though
> unless 
> they release handles.
> 
> > - open the file in a special mode so I can delete it also someone has an
> > open file handle on it. 
> 
>  > But for this I can't use QFile
> 
> Why? because we cannot set sharing flags FILE_SHARE_WRITE |
> FILE_SHARE_READ | 
> FILE_SHARE_DELETE as in CreateFile()?
> If we cannot alter the sharing for handle returned by QFile::handle(), we 
> could develop a wrapper... but hope the changes in Qt will make it
> unnecessary.
>
Afaik ou can't change a share mode after it was opened - so you either have to patch the qt sources or write your own QFile::open().
My current problem is that I don't know what side effects FILE_SHARE_DELETE has.


Christian

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