How a Kernel mode Driver detects that if Device is DISABLED/ENABLE D through Device manager.

NTDEV
1

Dear Group,

I have some doubts regarding the following,

If we Disable/Enable/Upgrade the Driver for a particular device through Device manager ,

  1. How a kernel mode driver will come to know about this action.
  2. If the driver receive some IRP/message/Event about this action,
    what are the further steps for a driver should do.
  3. How the USER mode Applications will come to know about this action.

Thanks,

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2

  1. your driver does not know about the specific action. A driver has
    no idea about the difference between a disable or an uninstall or an
    upgrade, it just sees a query remove -> remove.

  2. your driver will receive a query remove -> remove on the device.
    You must succeed the query remove so that the action can be taken

  3. applications are notified about the impending removal of a device if
    they have a handle open on the device. The application would then
    register for handle notifications on the handle
    (RegisterDeviceNotification,
    http://msdn2.microsoft.com/en-us/library/aa363431.aspx, type
    DBT_DEVTYP_HANDLE) and close the handle to allow the query remove to
    succeed.

d

From: xxxxx@lists.osr.com
[mailto:xxxxx@lists.osr.com] On Behalf Of aare ravinder
Sent: Monday, April 09, 2007 3:58 AM
To: Windows System Software Devs Interest List
Subject: [ntdev] How a Kernel mode Driver detects that if Device is
DISABLED/ENABLE D through Device manager.

Dear Group,

I have some doubts regarding the following,

If we Disable/Enable/Upgrade the Driver for a particular device through
Device manager ,

  1. How a kernel mode driver will come to know about this action.

  2. If the driver receive some IRP/message/Event about this
    action,

what are the further steps for a drivershould do.

  1. How the USER mode Applications will come to know about this action.

Thanks,

TV dinner still cooling?
Check out “Tonight’s Picks”
http:</http:> on Yahoo! TV.
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