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175 lines
4.2 KiB
175 lines
4.2 KiB
//---------------------------------------------------------------------------
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//
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// Module: ins.h
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//
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// Description: KS Instance base class definition
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//
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//
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//@@BEGIN_MSINTERNAL
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// Development Team:
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// Mike McLaughlin
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//
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// History: Date Author Comment
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//
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//@@END_MSINTERNAL
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//---------------------------------------------------------------------------
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//
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// THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY
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// KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
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// IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR
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// PURPOSE.
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//
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// Copyright (c) 1996-1999 Microsoft Corporation. All Rights Reserved.
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//
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//---------------------------------------------------------------------------
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//---------------------------------------------------------------------------
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// Globals
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//---------------------------------------------------------------------------
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extern "C" const KSDISPATCH_TABLE DispatchTable;
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//---------------------------------------------------------------------------
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// Classes
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//---------------------------------------------------------------------------
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typedef class CInstance
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{
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friend class ListDoubleField<CInstance>;
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public:
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CInstance(
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IN PPARENT_INSTANCE pParentInstance
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);
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~CInstance(
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);
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static NTSTATUS
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DispatchClose(
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IN PDEVICE_OBJECT pDeviceObject,
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IN PIRP pIrp
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);
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static NTSTATUS
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DispatchForwardIrp(
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IN PDEVICE_OBJECT pDeviceObject,
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IN PIRP pIrp
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);
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VOID
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Invalidate(
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);
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PFILE_OBJECT
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GetNextFileObject(
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)
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{
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return(pNextFileObject);
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};
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PPIN_INSTANCE
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GetParentInstance( // inline body in pins.h
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);
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NTSTATUS
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SetNextFileObject(
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HANDLE handle
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)
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{
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//
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// SECURITY NOTE:
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// This call is OK because the handle comes always from a trusted
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// source.
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//
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return(ObReferenceObjectByHandle(
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handle,
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GENERIC_READ | GENERIC_WRITE,
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NULL,
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KernelMode,
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(PVOID*)&pNextFileObject,
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NULL));
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};
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NTSTATUS
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DispatchCreate(
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IN PIRP pIrp,
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IN UTIL_PFN pfnDispatchCreate,
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IN OUT PVOID pReference,
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IN ULONG cCreateItems = 0,
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IN PKSOBJECT_CREATE_ITEM pCreateItems = NULL,
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IN const KSDISPATCH_TABLE *pDispatchTable = &DispatchTable
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);
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VOID GrabInstanceMutex()
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{
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ASSERT(KeGetCurrentIrql() == PASSIVE_LEVEL);
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AssertStatus(
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KeWaitForMutexObject(pMutex, Executive, KernelMode, FALSE, NULL));
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};
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VOID ReleaseInstanceMutex()
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{
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ASSERT(KeGetCurrentIrql() == PASSIVE_LEVEL);
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KeReleaseMutex(pMutex, FALSE);
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};
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private:
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VOID
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AddList(
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CListDouble *pld
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)
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{
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ldiNext.AddList(pld);
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};
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VOID
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RemoveList(
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)
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{
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ldiNext.RemoveList();
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};
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//
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// This pointer to the dispatch table is used in the common
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// dispatch routines to route the IRP to the appropriate
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// handlers. This structure is referenced by the device driver
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// with IoGetCurrentIrpStackLocation( pIrp ) -> FsContext
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//
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PVOID pObjectHeader;
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PFILE_OBJECT pParentFileObject;
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PDEVICE_OBJECT pNextDeviceObject;
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PPARENT_INSTANCE pParentInstance;
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PFILE_OBJECT pNextFileObject;
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CLIST_DOUBLE_ITEM ldiNext;
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KMUTEX *pMutex;
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public:
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DefineSignature(0x534e4943); // CINS
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} INSTANCE, *PINSTANCE;
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//---------------------------------------------------------------------------
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typedef ListDoubleField<INSTANCE> LIST_INSTANCE, *PLIST_INSTANCE;
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//---------------------------------------------------------------------------
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typedef class CParentInstance
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{
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friend class CInstance;
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public:
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VOID
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Invalidate(
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);
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BOOL
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IsChildInstance(
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)
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{
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return(lstChildInstance.IsLstEmpty());
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};
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LIST_INSTANCE lstChildInstance;
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DefineSignature(0x52415043); // CPAR
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} PARENT_INSTANCE, *PPARENT_INSTANCE;
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//---------------------------------------------------------------------------
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