Re: Re: [ntdev] Question regarding export drivers

First of all, thanks a lot for the responses. I am so grateful to get
responses on such an off topic.

“There’s really no good mechanism to manage a shared export driver across
multiple driver packages” - exactly what I found with my experiments and
hence the question if the driver can act as both regular driver and export
driver.

Doron,
Can you elaborate on load order problems?

If I am able to work around whatever problems are, will such driver be
eligible for certification?

Regards,
Chakri

On Mon, Apr 13, 2015 at 4:52 AM, Martin O’Brien <
xxxxx@gmail.com> wrote:

So true – unless you really need them (which sometimes you do), DLL’s are
just more trouble than they are worth, IMO.

mm

*From:* xxxxx@lists.osr.com [mailto:
xxxxx@lists.osr.com] *On Behalf Of *Marion Bond
*Sent:* Monday, April 13, 2015 7:35 AM
*To:* Windows System Software Devs Interest List
*Subject:* [ntdev] Re: [ntdev] Question regarding export drivers

Note that source code can easily be shared via encapsulation in a static
library. This produces a duplicated memory footprint, but avoids all load
order and versioning issued associated with sharing

Sent from Surface Pro

*From:* Peter Wieland
> Sent: ‎Sunday‎, ‎April‎ ‎12‎, ‎2015 ‎6‎:‎14‎ ‎PM
> To: Windows System Software Devs Interest List
>
>
>
> There’s really no good mechanism to manage a shared export driver across
> multiple driver packages. Since, as Doron pointed out, the versioning is
> done at the package level, it’s very easy for package B, which contains an
> older version of the export driver, to install and roll the export driver
> back to something older than package A requires.
>
>
>
> PNP also doesn’t know how to shut down an export driver, so when you
> install package B PNP will copy the export driver, but may not be able to
> ensure that it unloads and the newer version loads.
>
>
>
> Generally the rule is not to try and share drivers between packages.
>
>
>
> -p
>
>
>
> From: xxxxx@lists.osr.com [
> mailto:xxxxx@lists.osr.com
> ] *On Behalf Of *Doron Holan
> Sent: Saturday, April 11, 2015 9:06 PM
> To: Windows System Software Devs Interest List
> Subject: RE: [ntdev] Question regarding export drivers
>
>
>
> 1 yes, but it can get a little complicated with respect to load order
>
> 2 each package should install the export driver
>
> 3 versioning is done at the driver package level for pnp install, not at
> the binary level, so export drives are versioned by the containing pnp
> driver package that installs it
>
>
>
> From: xxxxx@lists.osr.com [
> mailto:xxxxx@lists.osr.com
> ] *On Behalf Of *Driver Learner
> Sent: Saturday, April 11, 2015 1:49 PM
> To: Windows System Software Devs Interest List
> Subject: [ntdev] Question regarding export drivers
>
>
>
> Hello Gurus,
>
>
>
> I have few questions on export drivers.
>
> 1. Can an export driver also implement and act as regular driver?
>
> 2. If more than one driver uses the export driver, how should it be
> packaged for install?
>
> 3. How is versioning maintained for the export driver? Is it same as
> regular driver?
>
>
>
> My questions are in pure academic interest and maybe dumb. Please bear
> with me.
>
> Best regards,
>
> Chakri
>
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