STATUS PENDING IN XP

NTFSD
1

Hello,
I have a filter driver which in the presence of certain other filter
drivers does not return from IoCallDriver in XP but is working fine in
2000 / NT. Please point me to any documentation of handling STATUS_PENDING
in XP or what could be wrong with the code below in the dispatch of
create.
******************
PtrNextIoStackLocation = IoGetNextIrpStackLocation(Irp);
*PtrNextIoStackLocation = *PtrCurrentStackLocation;
IoSetCompletionRoutine(Irp,CompletionRoutine,
LocalContext,TRUE,TRUE,TRUE);
IoMarkIrpPending(Irp);
RC = IoCallDriver(PtrTargetDeviceObject, Irp);
return STATUS_PENDING;
********************************
Regards,
Dinesh

2

Read Walter Oney’s book, or the Viscarola & Mason book, or the OSR website
and DDK documentation. This is not the correct way to copy one stack
location to the next.

----- Original Message -----
From: “Dinesh Sinha”
To: “File Systems Developers”
Sent: Tuesday, April 15, 2003 4:28 PM
Subject: [ntfsd] STATUS PENDING IN XP

> Hello,
> I have a filter driver which in the presence of certain other filter
> drivers does not return from IoCallDriver in XP but is working fine in
> 2000 / NT. Please point me to any documentation of handling STATUS_PENDING
> in XP or what could be wrong with the code below in the dispatch of
> create.
>
> PtrNextIoStackLocation = IoGetNextIrpStackLocation(Irp);
> *PtrNextIoStackLocation = *PtrCurrentStackLocation;
> IoSetCompletionRoutine(Irp,CompletionRoutine,
> LocalContext,TRUE,TRUE,TRUE);
> IoMarkIrpPending(Irp);
> RC = IoCallDriver(PtrTargetDeviceObject, Irp);
> return STATUS_PENDING;
>**************
> Regards,
> Dinesh
>
> —
> You are currently subscribed to ntfsd as: xxxxx@yoshimuni.com
> To unsubscribe send a blank email to xxxxx@lists.osr.com
>

3

The effect of IoCopyCurrentStackLocationToNext + IoSetCompletionRoutine is
the same as the code below.

Read Walter Oney’s book, or the Viscarola & Mason book, or the OSR website and
DDK documentation. This is not the correct way to copy one stack location to
the next.
> PtrNextIoStackLocation = IoGetNextIrpStackLocation(Irp);
> *PtrNextIoStackLocation = *PtrCurrentStackLocation;
> IoSetCompletionRoutine(Irp,CompletionRoutine,
> LocalContext,TRUE,TRUE,TRUE);
> IoMarkIrpPending(Irp);
> RC = IoCallDriver(PtrTargetDeviceObject, Irp);
> return STATUS_PENDING;

–
Kind regards, Dejan M. MVP for DDK
http://www.alfasp.com E-mail: xxxxx@alfasp.com
Alfa Transparent File Encryptor - Transparent file encryption services.
Alfa File Protector - File protection and hiding library for Win32 developers.
Alfa File Monitor - File monitoring library for Win32 developers.

4

How about Context? It is set in the macro. It might matter otherwise zero
it out?

----- Original Message -----
From: “Dejan Maksimovic”
To: “File Systems Developers”
Sent: Tuesday, April 15, 2003 6:03 PM
Subject: [ntfsd] Re: STATUS PENDING IN XP

>
> The effect of IoCopyCurrentStackLocationToNext +
IoSetCompletionRoutine is
> the same as the code below.
>
> > Read Walter Oney’s book, or the Viscarola & Mason book, or the OSR
website and
> > DDK documentation. This is not the correct way to copy one stack
location to
> > the next.
> > > PtrNextIoStackLocation = IoGetNextIrpStackLocation(Irp);
> > > *PtrNextIoStackLocation = *PtrCurrentStackLocation;
> > > IoSetCompletionRoutine(Irp,CompletionRoutine,
> > > LocalContext,TRUE,TRUE,TRUE);
> > > IoMarkIrpPending(Irp);
> > > RC = IoCallDriver(PtrTargetDeviceObject, Irp);
> > > return STATUS_PENDING;
>
> –
> Kind regards, Dejan M. MVP for DDK
> http://www.alfasp.com E-mail: xxxxx@alfasp.com
> Alfa Transparent File Encryptor - Transparent file encryption services.
> Alfa File Protector - File protection and hiding library for Win32
developers.
> Alfa File Monitor - File monitoring library for Win32 developers.
>
>
>
>
> —
> You are currently subscribed to ntfsd as: xxxxx@yoshimuni.com
> To unsubscribe send a blank email to xxxxx@lists.osr.com
>

5

IoSetCompletionRoutine sets the Context. And both have that.

How about Context? It is set in the macro. It might matter otherwise zero
it out?

–
Kind regards, Dejan M. MVP for DDK
http://www.alfasp.com E-mail: xxxxx@alfasp.com
Alfa Transparent File Encryptor - Transparent file encryption services.
Alfa File Protector - File protection and hiding library for Win32 developers.
Alfa File Monitor - File monitoring library for Win32 developers.

6

Thanks Dejan and David for your responses.
I will try to make the description more elaborate if it helps.
The other driver in question is Norton Antivirus version 9.00.68b.

  1. When I trace a create call to a file “1.txt”, it first comes to our
    filter driver. I call IoCallDriver and return STATUS_PENDING as shown in
    my first mail. But the call does not return from IoCallDriver immediately.
  2. Another Create call comes to me. It does appear to be generated from
    the driver below my driver (probably norton antivirus).
  3. If I again call IoCallDriver and return STATUS_PENDING, it hangs. If I
    return STATUS_SUCCESS without setting any completion routine, things work
    fine. In this case, I see a return from IoCallDriver in this step as well
    as the IoCallDriver described in step 1.

Regards,
Dinesh