Windows System Software -- Consulting, Training, Development -- Unique Expertise, Guaranteed Results


Before Posting...

Please check out the Community Guidelines in the Announcements and Administration Category.

More Info on Driver Writing and Debugging

The free OSR Learning Library has more than 50 articles on a wide variety of topics about writing and debugging device drivers and Minifilters. From introductory level to advanced. All the articles have been recently reviewed and updated, and are written using the clear and definitive style you've come to expect from OSR over the years.

Check out The OSR Learning Library at:

Using `FltCreateNamedPipeFile` to create a NamedPipe in minifilter

dilawardilawar Member Posts: 6
edited November 8 in NTDEV

I am using a relatively new API called FltCreateNamedPipeFile ( to create a named pipe in my DfLoad routine of mini filter.

I am feeling a bit lazy to create MWE. The function InitializeNamedPipe creates a named pipe.

// globals.
UNICODE_STRING gServerNamedPipe = RTL_CONSTANT_STRING(L"\\\\.\\pipe\\SubComPipe");
HANDLE gServerNamedPipeHandle;

// ... 
InitializeNamedPipe(IN PUNICODE_STRING PipeName, IN PFLT_FILTER Filter)
    IO_STATUS_BLOCK ioStatusBlock;

    NTSTATUS status;
    InitializeObjectAttributes(&objAttr, &gServerNamedPipe, OBJ_KERNEL_HANDLE, NULL, NULL);

    status = FltCreateNamedPipeFile(Filter, /* Filter */
        NULL,                               /* Instance */
        &gServerNamedPipeHandle,            /* FileHandle */
        NULL,                               /* *FileObject */
        FILE_WRITE_DATA,                    /* DesiredAccess */
        &objAttr,                           /* ObjectAttributes */
        &ioStatusBlock,                     /* IoStatusBlock */
        FILE_SHARE_READ,                    /* ShareAccess */
        FILE_OPEN_IF,                       /* CreateDisposition */
        FILE_WRITE_THROUGH,                 /* CreateOptions */
        FILE_PIPE_BYTE_STREAM_TYPE,         /* NamedPipeType */
        FILE_PIPE_BYTE_STREAM_MODE,         /* ReadMode */
        FILE_PIPE_COMPLETE_OPERATION,       /* CompletionMode */
        NULL,                               /* MaximumInstnaces */
        1024,                               /* InboundQuota */
        4096,                               /* OutboundQuota */
        NULL,                               /* DefaultTimeOut */
        NULL                                /* DriverContext */
    DFLOG(INFO, __FUNCTION__ ": IoStatusBlock status %X", ioStatusBlock.Status);
    return status;

This routine returns (status in functions above) code C0000033 which -- according to the NTSTATUS reference page -- means that The object name is invalid. From a brief search, I am getting the hint that maybe there is something wrong with the gServerNamedPipe?! On the other hand, windivert.c ( is using a similar naming scheme for named pipes (but without \\pipe\\).

InitializeNamedPipe: IoStatusBlock status 0
Shield>DriverEntry: NamePipeCreation code - C0000033

I am pretty sure I am doing something wrong but can't figure out how to go about debugging it.

Sign In or Register to comment.

Howdy, Stranger!

It looks like you're new here. Sign in or register to get started.

Upcoming OSR Seminars
OSR has suspended in-person seminars due to the Covid-19 outbreak. But, don't miss your training! Attend via the internet instead!
Kernel Debugging 30 January 2023 Live, Online
Developing Minifilters 20 March 2023 Live, Online
Writing WDF Drivers TBD 2023 Live, Online
Internals & Software Drivers 17 April 2023 Live, Online