Leaked source code of windows server 2003
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/*++
Copyright (c) 1991 Microsoft Corporation
Module Name:
devobj.c
Abstract:
This module contains code which implements the DEVICE_CONTEXT object.
The device context object is a structure which contains a
system-defined DEVICE_OBJECT followed by information which is maintained
by the provider, called the context.
Author:
Colin Watson (ColinW) 13-Mar-1991
Environment:
Kernel mode
Revision History:
--*/
#include "nb.h"
#ifdef ALLOC_PRAGMA
#pragma alloc_text(INIT, NbCreateDeviceContext)
#endif
NTSTATUS
NbCreateDeviceContext(
IN PDRIVER_OBJECT DriverObject,
IN PUNICODE_STRING DeviceName,
IN OUT PDEVICE_CONTEXT *DeviceContext,
IN PUNICODE_STRING RegistryPath
)
/*++
Routine Description:
This routine creates and initializes a device context structure.
Arguments:
DriverObject - pointer to the IO subsystem supplied driver object.
DeviceContext - Pointer to a pointer to a transport device context object.
DeviceName - pointer to the name of the device this device object points to.
RegistryPath - The name of the Netbios node in the registry.
Return Value:
STATUS_SUCCESS if all is well; STATUS_INSUFFICIENT_RESOURCES otherwise.
--*/
{
NTSTATUS status;
PDEVICE_OBJECT deviceObject;
PDEVICE_CONTEXT deviceContext;
PAGED_CODE();
//
// Create the device object for NETBEUI.
//
status = IoCreateDevice(
DriverObject,
sizeof (DEVICE_CONTEXT) + RegistryPath->Length - sizeof (DEVICE_OBJECT),
DeviceName,
FILE_DEVICE_TRANSPORT,
FILE_DEVICE_SECURE_OPEN,
FALSE,
&deviceObject);
if (!NT_SUCCESS(status)) {
return status;
}
// DeviceContext contains:
// the device object
// Intialized
// RegistryPath
deviceContext = (PDEVICE_CONTEXT)deviceObject;
deviceObject->Flags |= DO_DIRECT_IO;
//
// Determine the IRP stack size that we should "export".
//
deviceObject->StackSize = GetIrpStackSize(
RegistryPath,
NB_DEFAULT_IO_STACKSIZE);
deviceContext->RegistryPath.MaximumLength = RegistryPath->Length;
deviceContext->RegistryPath.Buffer = (PWSTR)(deviceContext+1);
RtlCopyUnicodeString( &deviceContext->RegistryPath, RegistryPath );
//
// Initialize the driver object with this driver's entry points.
//
DriverObject->MajorFunction [IRP_MJ_CREATE] = NbDispatch;
DriverObject->MajorFunction [IRP_MJ_CLOSE] = NbDispatch;
DriverObject->MajorFunction [IRP_MJ_CLEANUP] = NbDispatch;
DriverObject->MajorFunction [IRP_MJ_DEVICE_CONTROL] = NbDispatch;
DriverObject-> DriverUnload = NbDriverUnload;
*DeviceContext = deviceContext;
return STATUS_SUCCESS;
}