Problems sending named events to Driver

Hi NG

My driver has problems recieving a event from my user mode applikation. But
there is no problems recieving the same event in my appilication from the
device driver.

Thia is what I do:

In my DriverEntry i create the event with this:

// Create event for user-mode processes to monitor
RtlInitUnicodeString(&uszNotifyEventString,
L"\\BaseNamedObjects\\AppEvent");

// Trying to create the event
NotifyEvent = IoCreateNotificationEvent(&uszNotifyEventString,
&NotifyHandle);

if(NotifyEvent)
{
// Success
KdPrint(("NotifyEvent event created with success\r\n"));

// Clear it...
KeClearEvent(NotifyEvent);
}

I get the handle to the event in my application like this:

// Creating event. ITs created by the driver..
hEvent = OpenEvent(SYNCHRONIZE, FALSE, _T("AppEvent"));

if(NULL == hEvent )
{
return 0;
}

They both succed.
My application then waits for the event:

// The events used..
hEvents[0] = pService->HEndThread;
byNumOfEvents++;
hEvents[1] = hEvent ;
byNumOfEvents++;


dwWait = WaitForMultipleObjects(byNumOfEvents, hEvents, FALSE,
INFINITE);

if((WAIT_OBJECT_0 + 1) == dwWait)
{
// Set event again. Driver does not respond to this
SetEvent(hEvent ); <----- No responds in my driver on this
}

When my driver signals the event ( KeSetEvent(NotifyEvent, 0, TRUE) ) my
application is responding OK to the event

But when my application sets the event my driver does not respond to it.

// Setting event
KeSetEvent(NotifyEvent, 0, TRUE); <--- My application responds to this

KeResetEvent(NotifyEvent);

// Waiting for the service to answer
status = KeWaitForSingleObject(NotifyEvent, UserRequest, KernelMode,
FALSE, &WaitTimeOut);

// Never reached.
if(STATUS_SUCCESS == status)
{
KdPrint(("Got event.\r\n"));

// Service has answered. Clear the event. Shutdown in progress
KeResetEvent(NotifyEvent);
}

Any Idea ??
Schould I call the OpenEvent() with EVENT_ALL_ACCESS instead of SYNCHRONIZE
?? If I do I got an error that say "Access is denied". How can I create the
event with privilege to do this ??

Thomas

Maxim
Mon Jun 30 06:25:16 CDT 2003

> My driver has problems recieving a event from my user mode
applikation. But
> there is no problems recieving the same event in my appilication
from the
> device driver.
>
> Thia is what I do:
>
> In my DriverEntry i create the event with this:
>
> // Create event for user-mode processes to monitor
> RtlInitUnicodeString(&uszNotifyEventString,
> L"\\BaseNamedObjects\\AppEvent");

A much better way is to not use the named event. Create the unnamed
event in user mode, and pass the handle to the driver via IOCTL call.

Max

Eliyas
Mon Jun 30 12:54:28 CDT 2003

http://support.microsoft.com/default.aspx?scid=kb;EN-US;Q228785

--
-Eliyas
This posting is provided "AS IS" with no warranties, and confers no rights.
http://www.microsoft.com/whdc/hwdev/driver/kb-drv.mspx

"Maxim S. Shatskih" <maxim@storagecraft.com> wrote in message
news:uNCVsqvPDHA.2460@TK2MSFTNGP10.phx.gbl...
> > My driver has problems recieving a event from my user mode
> applikation. But
> > there is no problems recieving the same event in my appilication
> from the
> > device driver.
> >
> > Thia is what I do:
> >
> > In my DriverEntry i create the event with this:
> >
> > // Create event for user-mode processes to monitor
> > RtlInitUnicodeString(&uszNotifyEventString,
> > L"\\BaseNamedObjects\\AppEvent");
>
> A much better way is to not use the named event. Create the unnamed
> event in user mode, and pass the handle to the driver via IOCTL call.
>
> Max
>
>