Cool - sounds like a good approach, given that you'll have many user
mode clients of these synch objects.
As you probably know (I'm probably misinterpreting your last
paragraph) you would be able to use the synch objects from contexts other
than you user mode app (i.e. system process, other user mode processes) in
you device driver code (through kernel pointer to the dispatch objects).
Thanx, I may wind up in this route in the end. However, the reason that I
really want to use name is that the Filter driver is not the only client of
these named kernel objects. There is also COM object that talk to this user
mode application that create these kernel objects.
Also the context that the filter driver access these kernel objects is
different from the user mode application. It will be preferrable if I can
access them by name.
> -----Original Message-----
> From: Smith, Joel [SMTP:[email protected]
> Sent: Wednesday, March 01, 2000 8:31 AM
> To: File Systems Developers Interest List
> Subject: [ntfsd] RE: How to access named kernel object created by
> user mo de applicati on in kernel driver?
> You could just pass the handles of the dispatch objects to the
> kernel mode driver from the user mode application via some IRP you define.
> You will be in the same context as the user mode app, so the handles will
> be valid. You could then reference the synch objects handles with
> ObReferenceObjectByHandle, hold onto there pointers in the driver, and use
> the dispatch objects with normal kernel mode synchronization calls.
> Hi all,
> I have a user mode application that uses the SWMRG(single writer multiple
> readers guard) as implemented in chap 10 of Advanced windows to protect a
> named memory mapped file.
> In the kernel mode file filter driver, I need to access the memory mapped
> file. In ZwOpenSection, we can pass an ObjectAttributes that encapsulates
> the name. However, I did not know how to do that for Mutex, Event &
> Semaphore kernel objects.
> Any idea ?
> Jack(Wei-Chi) Cheng
> Lexis-Nexis DCE Support Team
> email: [email protected]
> phone: 937-8656800 x 4028
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