[wdmaudiodev] Re: using CreateFile for creating multi handles for an device

  • From: Eugene Muzychenko <emuzychenko@xxxxxxxxx>
  • To: Karthik Gurumurthy <wdmaudiodev@xxxxxxxxxxxxx>
  • Date: Mon, 8 Jun 2009 16:02:45 +0700

Hello Karthik,

> For the creation of handle it is working File, Now if i try to create
> another handle with
...
> This is failing with ACCESS_DENIED

To have an ability to create more than a single handle, device driver
must support creation of multiple instances. For each CreateFile call, the
IRP_MJ_CREATE request is sent to the driver. Many drivers allow only a
single open/create request, and will fail subsequent requests until
the handle is closed.

Regards,
Eugene

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