124 lines
2.8 KiB
C
124 lines
2.8 KiB
C
/*++
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Copyright (c) 1991 Microsoft Corporation
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Module Name:
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devobj.c
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Abstract:
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This module contains code which implements the DEVICE_CONTEXT object.
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The device context object is a structure which contains a
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system-defined DEVICE_OBJECT followed by information which is maintained
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by the provider, called the context.
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Author:
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Colin Watson (ColinW) 13-Mar-1991
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Environment:
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Kernel mode
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Revision History:
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--*/
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#include "nb.h"
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#ifdef ALLOC_PRAGMA
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#pragma alloc_text(PAGE, NbCreateDeviceContext)
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#endif
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NTSTATUS
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NbCreateDeviceContext(
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IN PDRIVER_OBJECT DriverObject,
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IN PUNICODE_STRING DeviceName,
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IN OUT PDEVICE_CONTEXT *DeviceContext,
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IN PUNICODE_STRING RegistryPath
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)
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/*++
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Routine Description:
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This routine creates and initializes a device context structure.
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Arguments:
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DriverObject - pointer to the IO subsystem supplied driver object.
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DeviceContext - Pointer to a pointer to a transport device context object.
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DeviceName - pointer to the name of the device this device object points to.
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RegistryPath - The name of the Netbios node in the registry.
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Return Value:
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STATUS_SUCCESS if all is well; STATUS_INSUFFICIENT_RESOURCES otherwise.
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--*/
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{
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NTSTATUS status;
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PDEVICE_OBJECT deviceObject;
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PDEVICE_CONTEXT deviceContext;
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PAGED_CODE();
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//
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// Create the device object for NETBEUI.
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//
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status = IoCreateDevice(
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DriverObject,
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sizeof (DEVICE_CONTEXT) + RegistryPath->Length - sizeof (DEVICE_OBJECT),
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DeviceName,
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FILE_DEVICE_TRANSPORT,
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0,
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FALSE,
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&deviceObject);
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if (!NT_SUCCESS(status)) {
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return status;
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}
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// DeviceContext contains:
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// the device object
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// Intialized
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// RegistryPath
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deviceContext = (PDEVICE_CONTEXT)deviceObject;
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deviceObject->Flags |= DO_DIRECT_IO;
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//
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// Determine the IRP stack size that we should "export".
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//
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deviceObject->StackSize = GetIrpStackSize(
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RegistryPath,
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NB_DEFAULT_IO_STACKSIZE);
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deviceContext->RegistryPath.MaximumLength = RegistryPath->Length;
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deviceContext->RegistryPath.Buffer = (PWSTR)(deviceContext+1);
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RtlCopyUnicodeString( &deviceContext->RegistryPath, RegistryPath );
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//
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// Initialize the driver object with this driver's entry points.
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//
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DriverObject->MajorFunction [IRP_MJ_CREATE] = NbDispatch;
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DriverObject->MajorFunction [IRP_MJ_CLOSE] = NbDispatch;
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DriverObject->MajorFunction [IRP_MJ_CLEANUP] = NbDispatch;
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DriverObject->MajorFunction [IRP_MJ_DEVICE_CONTROL] = NbDispatch;
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*DeviceContext = deviceContext;
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return STATUS_SUCCESS;
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}
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