-/*\r
- * COPYRIGHT: See COPYING in the top level directory\r
- * PROJECT: ReactOS kernel\r
- * FILE: ntoskrnl/ob/object.c\r
- * PURPOSE: Implements generic object managment functions\r
- * PROGRAMMER: David Welch (welch@mcmail.com)\r
- * UPDATE HISTORY:\r
- * 10/06/98: Created\r
- */\r
-\r
-/* INCLUDES *****************************************************************/\r
-\r
-#include <ddk/ntddk.h>\r
-#include <internal/ob.h>\r
-#include <wstring.h>\r
-#include <string.h>\r
-\r
-#define NDEBUG\r
-#include <internal/debug.h>\r
-\r
-/* FUNCTIONS ************************************************************/\r
-\r
-NTSTATUS STDCALL NtSetInformationObject(IN HANDLE ObjectHandle,\r
- IN CINT ObjectInformationClass,\r
- IN PVOID ObjectInformation,\r
- IN ULONG Length)\r
-{\r
- return(ZwSetInformationObject(ObjectHandle,\r
- ObjectInformationClass,\r
- ObjectInformation,\r
- Length));\r
-}\r
-\r
-NTSTATUS STDCALL ZwSetInformationObject(IN HANDLE ObjectHandle,\r
- IN CINT ObjectInformationClass,\r
- IN PVOID ObjectInformation,\r
- IN ULONG Length)\r
-{\r
- UNIMPLEMENTED;\r
-}\r
-\r
-NTSTATUS STDCALL NtQueryObject(IN HANDLE ObjectHandle,\r
- IN CINT ObjectInformationClass,\r
- OUT PVOID ObjectInformation,\r
- IN ULONG Length,\r
- OUT PULONG ResultLength)\r
-{\r
- return(ZwQueryObject(ObjectHandle,\r
- ObjectInformationClass,\r
- ObjectInformation,\r
- Length,\r
- ResultLength));\r
-}\r
-\r
-NTSTATUS STDCALL ZwQueryObject(IN HANDLE ObjectHandle,\r
- IN CINT ObjectInformationClass,\r
- OUT PVOID ObjectInformation,\r
- IN ULONG Length,\r
- OUT PULONG ResultLength)\r
-{\r
- UNIMPLEMENTED\r
-}\r
-\r
-NTSTATUS NtMakeTemporaryObject(HANDLE Handle)\r
-{\r
- return(ZwMakeTemporaryObject(Handle));\r
-}\r
-\r
-NTSTATUS ZwMakeTemporaryObject(HANDLE Handle)\r
-{\r
- PVOID Object;\r
- NTSTATUS Status; \r
- POBJECT_HEADER ObjectHeader;\r
- \r
- Status = ObReferenceObjectByHandle(Handle,\r
- 0,\r
- NULL,\r
- KernelMode,\r
- &Object,\r
- NULL);\r
- if (Status != STATUS_SUCCESS)\r
- {\r
- return(Status);\r
- }\r
-\r
- ObjectHeader = BODY_TO_HEADER(Object);\r
- ObjectHeader->Permanent = FALSE;\r
- \r
- ObDereferenceObject(Object);\r
- \r
- return(STATUS_SUCCESS);\r
-}\r
-\r
-PVOID ObGenericCreateObject(PHANDLE Handle,\r
- ACCESS_MASK DesiredAccess,\r
- POBJECT_ATTRIBUTES ObjectAttributes,\r
- POBJECT_TYPE Type)\r
-{\r
- POBJECT_HEADER hdr = NULL;\r
- PWSTR path;\r
- PWSTR name;\r
- PWSTR Ignored;\r
- PULONG addr;\r
- PWSTR Buffer;\r
- \r
- DPRINT("ObGenericCreateObject(Handle %x, DesiredAccess %x,"\r
- "ObjectAttributes %x, Type %x)\n",Handle,DesiredAccess,\r
- ObjectAttributes,Type);\r
- \r
- /*\r
- * Allocate the object body and header\r
- */\r
- hdr=(POBJECT_HEADER)ExAllocatePool(NonPagedPool,OBJECT_ALLOC_SIZE(Type));\r
- DPRINT("OBJECT_ALLOC_SIZE(Type) %d\n",OBJECT_ALLOC_SIZE(Type));\r
- if (hdr==NULL)\r
- {\r
- return(NULL);\r
- }\r
- DPRINT("hdr %x\n",hdr);\r
-\r
-\r
- /*\r
- * If unnamed then initalize\r
- */\r
- if (ObjectAttributes==NULL || ObjectAttributes->ObjectName==NULL)\r
- {\r
- ObInitializeObjectHeader(Type,NULL,hdr);\r
- if (Handle != NULL)\r
- {\r
- *Handle = ObInsertHandle(KeGetCurrentProcess(),\r
- HEADER_TO_BODY(hdr),\r
- DesiredAccess,\r
- FALSE);\r
- }\r
- return(HEADER_TO_BODY(hdr));\r
- }\r
-\r
- \r
- /*\r
- * Copy the object name into a buffer\r
- */\r
-// DbgPrint("ObjectAttributes->ObjectName %x\n",ObjectAttributes->ObjectName);\r
-// DbgPrint("ObjectAttributes->ObjectName->Length %d\n",\r
-// ObjectAttributes->ObjectName->Length);\r
-// DbgPrint("ObjectAttributes->ObjectName->MaximumLength %d\n",\r
-// ObjectAttributes->ObjectName->MaximumLength);\r
- Buffer = ExAllocatePool(NonPagedPool,\r
- ((ObjectAttributes->ObjectName->Length+1)*2)); \r
- if (Buffer==NULL)\r
- {\r
- return(NULL); \r
- }\r
- memcpy(Buffer, ObjectAttributes->ObjectName->Buffer,\r
- (ObjectAttributes->ObjectName->Length+1)*2);\r
- \r
- /*\r
- * Seperate the name into a path and name \r
- */\r
- name = wcsrchr(Buffer,'\\');\r
- if (name==NULL)\r
- {\r
- name=Buffer;\r
- path=NULL;\r
- }\r
- else\r
- {\r
- path=Buffer;\r
- *name=0;\r
- name=name+1;\r
- }\r
- DPRINT("name %w path %w\n",name,path);\r
- \r
- ObLookupObject(ObjectAttributes->RootDirectory,\r
- path,\r
- &hdr->Parent,\r
- &Ignored, \r
- 0L);\r
-\r
- /*\r
- * Initialize the object header\r
- */\r
- ObInitializeObjectHeader(Type,name,hdr);\r
-\r
-\r
- ObCreateEntry(hdr->Parent,hdr);\r
-\r
- DPRINT("Handle %x\n",Handle);\r
- if (Handle != NULL)\r
- {\r
- *Handle = ObInsertHandle(KeGetCurrentProcess(),\r
- HEADER_TO_BODY(hdr),\r
- DesiredAccess,\r
- FALSE);\r
- }\r
- \r
- return(HEADER_TO_BODY(hdr));\r
-}\r
-\r
-VOID ObInitializeObjectHeader(POBJECT_TYPE Type, PWSTR name,\r
- POBJECT_HEADER ObjectHeader)\r
-/*\r
- * FUNCTION: Creates a new object\r
- * ARGUMENT:\r
- * id = Identifier for the type of object\r
- * obj = Pointer to the header of the object\r
- */\r
-{\r
- PWSTR temp_name;\r
- extern unsigned long long ticks;\r
- \r
- DPRINT("ObInitializeObjectHeader(id %x name %w obj %x)\n",Type,\r
- name,ObjectHeader);\r
-\r
- ObjectHeader->HandleCount = 0;\r
- ObjectHeader->RefCount = 0;\r
- ObjectHeader->ObjectType = Type;\r
- ObjectHeader->Permanent = FALSE;\r
- if (name==NULL)\r
- {\r
- ObjectHeader->Name.Length=0;\r
- ObjectHeader->Name.Buffer=NULL;\r
- }\r
- else\r
- {\r
- RtlInitUnicodeString(&(ObjectHeader->Name),name);\r
- }\r
-}\r
-\r
-\r
-NTSTATUS ObReferenceObjectByPointer(PVOID ObjectBody,\r
- ACCESS_MASK DesiredAccess,\r
- POBJECT_TYPE ObjectType,\r
- KPROCESSOR_MODE AccessMode)\r
-/*\r
- * FUNCTION: Increments the pointer reference count for a given object\r
- * ARGUMENTS:\r
- * ObjectBody = Object's body\r
- * DesiredAccess = Desired access to the object\r
- * ObjectType = Points to the object type structure\r
- * AccessMode = Type of access check to perform\r
- * RETURNS: Status\r
- */\r
-{\r
- POBJECT_HEADER Object;\r
-\r
- DPRINT("ObReferenceObjectByPointer(%x)\n",ObjectBody);\r
- \r
- Object = BODY_TO_HEADER(ObjectBody);\r
- Object->RefCount++;\r
- return(STATUS_SUCCESS);\r
-}\r
-\r
-NTSTATUS ObPerformRetentionChecks(POBJECT_HEADER Header)\r
-{\r
- if (Header->RefCount == 0 && Header->HandleCount == 0 &&\r
- !Header->Permanent)\r
- {\r
- ObRemoveEntry(Header);\r
- ExFreePool(Header);\r
- }\r
- return(STATUS_SUCCESS);\r
-}\r
-\r
-VOID ObDereferenceObject(PVOID ObjectBody)\r
-/*\r
- * FUNCTION: Decrements a given object's reference count and performs\r
- * retention checks\r
- * ARGUMENTS:\r
- * ObjectBody = Body of the object\r
- */\r
-{\r
- POBJECT_HEADER Header = BODY_TO_HEADER(ObjectBody);\r
- Header->RefCount--;\r
- ObPerformRetentionChecks(Header);\r
-}\r
-\r
-\r
-NTSTATUS NtClose(HANDLE Handle)\r
-{\r
- return(ZwClose(Handle));\r
-}\r
-\r
-NTSTATUS ZwClose(HANDLE Handle)\r
-/*\r
- * FUNCTION: Closes a handle reference to an object\r
- * ARGUMENTS:\r
- * Handle = handle to close\r
- * RETURNS: Status\r
- */\r
-{\r
- PVOID ObjectBody;\r
- POBJECT_HEADER Header;\r
- PHANDLE_REP HandleRep;\r
- \r
- assert_irql(PASSIVE_LEVEL);\r
- \r
- HandleRep = ObTranslateHandle(KeGetCurrentProcess(),Handle);\r
- if (HandleRep == NULL)\r
- {\r
- return(STATUS_INVALID_HANDLE);\r
- } \r
- ObjectBody = HandleRep->ObjectBody;\r
- \r
- HandleRep->ObjectBody = NULL;\r
- \r
- Header = BODY_TO_HEADER(ObjectBody);\r
- \r
- Header->HandleCount--;\r
- ObPerformRetentionChecks(Header);\r
- \r
- return(STATUS_SUCCESS);\r
-}\r
-\r
-NTSTATUS ObReferenceObjectByHandle(HANDLE Handle,\r
- ACCESS_MASK DesiredAccess,\r
- POBJECT_TYPE ObjectType,\r
- KPROCESSOR_MODE AccessMode,\r
- PVOID* Object,\r
- POBJECT_HANDLE_INFORMATION \r
- HandleInformationPtr\r
- )\r
-/*\r
- * FUNCTION: Increments the reference count for an object and returns a \r
- * pointer to its body\r
- * ARGUMENTS:\r
- * Handle = Handle for the object\r
- * DesiredAccess = Desired access to the object\r
- * ObjectType\r
- * AccessMode \r
- * Object (OUT) = Points to the object body on return\r
- * HandleInformation (OUT) = Contains information about the handle \r
- * on return\r
- * RETURNS: Status\r
- */\r
-{\r
- PHANDLE_REP HandleRep;\r
- POBJECT_HEADER ObjectHeader;\r
- \r
- ASSERT_IRQL(PASSIVE_LEVEL);\r
- \r
- DPRINT("ObReferenceObjectByHandle(Handle %x, DesiredAccess %x, "\r
- "ObjectType %x, AccessMode %d, Object %x)\n",Handle,DesiredAccess,\r
- ObjectType,AccessMode,Object);\r
- \r
- if (Handle == NtCurrentProcess())\r
- {\r
- *Object = PsGetCurrentProcess();\r
- return(STATUS_SUCCESS);\r
- }\r
- if (Handle == NtCurrentThread())\r
- {\r
- *Object = PsGetCurrentThread();\r
- return(STATUS_SUCCESS);\r
- }\r
- \r
- HandleRep = ObTranslateHandle(KeGetCurrentProcess(),Handle);\r
- if (HandleRep == NULL || HandleRep->ObjectBody == NULL)\r
- {\r
- return(STATUS_INVALID_HANDLE);\r
- }\r
- \r
- ObjectHeader = BODY_TO_HEADER(HandleRep->ObjectBody);\r
- \r
- if (ObjectType != NULL && ObjectType != ObjectHeader->ObjectType)\r
- {\r
- return(STATUS_UNSUCCESSFUL);\r
- } \r
- \r
- if (!(HandleRep->GrantedAccess & DesiredAccess))\r
- {\r
- return(STATUS_ACCESS_DENIED);\r
- }\r
- \r
- ObjectHeader->RefCount++;\r
- \r
- *Object = HandleRep->ObjectBody;\r
- \r
- return(STATUS_SUCCESS);\r
-}\r
+/* $Id: object.c,v 1.46 2002/03/05 00:19:28 ekohl Exp $
+ *
+ * COPYRIGHT: See COPYING in the top level directory
+ * PROJECT: ReactOS kernel
+ * FILE: ntoskrnl/ob/object.c
+ * PURPOSE: Implements generic object managment functions
+ * PROGRAMMER: David Welch (welch@cwcom.net)
+ * UPDATE HISTORY:
+ * 10/06/98: Created
+ */
+
+/* INCLUDES *****************************************************************/
+
+#include <ddk/ntddk.h>
+#include <roscfg.h>
+#include <internal/ob.h>
+#include <internal/ps.h>
+#include <internal/id.h>
+#include <internal/ke.h>
+
+#define NDEBUG
+#include <internal/debug.h>
+
+/* FUNCTIONS ************************************************************/
+
+PVOID HEADER_TO_BODY(POBJECT_HEADER obj)
+{
+ return(((void *)obj)+sizeof(OBJECT_HEADER)-sizeof(COMMON_BODY_HEADER));
+}
+
+POBJECT_HEADER BODY_TO_HEADER(PVOID body)
+{
+ PCOMMON_BODY_HEADER chdr = (PCOMMON_BODY_HEADER)body;
+ return(CONTAINING_RECORD((&(chdr->Type)),OBJECT_HEADER,Type));
+}
+
+
+/**********************************************************************
+ * NAME PRIVATE
+ * ObInitializeObject
+ *
+ * DESCRIPTION
+ *
+ * ARGUMENTS
+ *
+ * RETURN VALUE
+ */
+VOID ObInitializeObject(POBJECT_HEADER ObjectHeader,
+ PHANDLE Handle,
+ ACCESS_MASK DesiredAccess,
+ POBJECT_TYPE Type,
+ POBJECT_ATTRIBUTES ObjectAttributes)
+{
+ ObjectHeader->HandleCount = 0;
+ ObjectHeader->RefCount = 1;
+ ObjectHeader->ObjectType = Type;
+ if (ObjectAttributes != NULL &&
+ ObjectAttributes->Attributes & OBJ_PERMANENT)
+ {
+ ObjectHeader->Permanent = TRUE;
+ }
+ else
+ {
+ ObjectHeader->Permanent = FALSE;
+ }
+ RtlInitUnicodeString(&(ObjectHeader->Name),NULL);
+ if (Handle != NULL)
+ {
+ ObCreateHandle(PsGetCurrentProcess(),
+ HEADER_TO_BODY(ObjectHeader),
+ DesiredAccess,
+ FALSE,
+ Handle);
+ }
+}
+
+
+/**********************************************************************
+ * NAME PRIVATE
+ * ObFindObject@16
+ *
+ * DESCRIPTION
+ *
+ * ARGUMENTS
+ * ObjectAttributes
+ *
+ * ReturnedObject
+ *
+ * RemainigPath
+ * Pointer to a unicode string that will contain the
+ * remaining path if the function returns successfully.
+ * The caller must free the buffer after use by calling
+ * RtlFreeUnicodeString ().
+ *
+ * ObjectType
+ * Optional pointer to an object type. This is used to
+ * descide if a symbolic link object will be parsed or not.
+ *
+ * RETURN VALUE
+ */
+NTSTATUS ObFindObject(POBJECT_ATTRIBUTES ObjectAttributes,
+ PVOID* ReturnedObject,
+ PUNICODE_STRING RemainingPath,
+ POBJECT_TYPE ObjectType)
+{
+ PVOID NextObject;
+ PVOID CurrentObject;
+ PVOID RootObject;
+ POBJECT_HEADER CurrentHeader;
+ NTSTATUS Status;
+ PWSTR Path;
+ PWSTR current;
+ UNICODE_STRING PathString;
+
+ DPRINT("ObFindObject(ObjectAttributes %x, ReturnedObject %x, "
+ "RemainingPath %x)\n",ObjectAttributes,ReturnedObject,RemainingPath);
+ DPRINT("ObjectAttributes->ObjectName %wZ\n",
+ ObjectAttributes->ObjectName);
+
+ RtlInitUnicodeString (RemainingPath, NULL);
+
+ if (ObjectAttributes->RootDirectory == NULL)
+ {
+ ObReferenceObjectByPointer(NameSpaceRoot,
+ DIRECTORY_TRAVERSE,
+ NULL,
+ UserMode);
+ CurrentObject = NameSpaceRoot;
+ }
+ else
+ {
+ Status = ObReferenceObjectByHandle(ObjectAttributes->RootDirectory,
+ DIRECTORY_TRAVERSE,
+ NULL,
+ UserMode,
+ &CurrentObject,
+ NULL);
+ if (!NT_SUCCESS(Status))
+ {
+ return(Status);
+ }
+ }
+
+ Path = ObjectAttributes->ObjectName->Buffer;
+
+ if (Path[0] == 0)
+ {
+ *ReturnedObject = CurrentObject;
+ return(STATUS_SUCCESS);
+ }
+
+ if ((ObjectAttributes->RootDirectory == NULL) && (Path[0] != '\\'))
+ {
+ ObDereferenceObject(CurrentObject);
+ return(STATUS_UNSUCCESSFUL);
+ }
+
+ if (Path)
+ {
+ RtlCreateUnicodeString (&PathString, Path);
+ current = PathString.Buffer;
+ }
+ else
+ {
+ RtlInitUnicodeString (&PathString, NULL);
+ current = NULL;
+ }
+
+ RootObject = CurrentObject;
+
+ while (TRUE)
+ {
+ DPRINT("current %S\n",current);
+ CurrentHeader = BODY_TO_HEADER(CurrentObject);
+
+ DPRINT("Current ObjectType %wZ\n",
+ &CurrentHeader->ObjectType->TypeName);
+
+ if (CurrentHeader->ObjectType->Parse == NULL)
+ {
+ DPRINT("Current object can't parse\n");
+ break;
+ }
+ Status = CurrentHeader->ObjectType->Parse(CurrentObject,
+ &NextObject,
+ &PathString,
+ ¤t,
+ ObjectType,
+ ObjectAttributes->Attributes);
+ if (Status == STATUS_REPARSE)
+ {
+ /* reparse the object path */
+ NextObject = RootObject;
+ current = PathString.Buffer;
+
+ ObReferenceObjectByPointer(NextObject,
+ DIRECTORY_TRAVERSE,
+ NULL,
+ UserMode);
+ }
+
+ if (NextObject == NULL)
+ {
+ break;
+ }
+ ObDereferenceObject(CurrentObject);
+ CurrentObject = NextObject;
+ }
+
+ if (current)
+ RtlCreateUnicodeString (RemainingPath, current);
+ RtlFreeUnicodeString (&PathString);
+ *ReturnedObject = CurrentObject;
+
+ return(STATUS_SUCCESS);
+}
+
+
+/**********************************************************************
+ * NAME EXPORTED
+ * ObCreateObject@36
+ *
+ * DESCRIPTION
+ *
+ * ARGUMENTS
+ *
+ * RETURN VALUE
+ */
+NTSTATUS STDCALL
+ObCreateObject(OUT PHANDLE Handle,
+ IN ACCESS_MASK DesiredAccess,
+ IN POBJECT_ATTRIBUTES ObjectAttributes,
+ IN POBJECT_TYPE Type,
+ OUT PVOID *Object)
+{
+ PVOID Parent = NULL;
+ UNICODE_STRING RemainingPath;
+ POBJECT_HEADER Header;
+ POBJECT_HEADER ParentHeader = NULL;
+ NTSTATUS Status;
+ BOOLEAN ObjectAttached = FALSE;
+
+ assert_irql(APC_LEVEL);
+
+ DPRINT("ObCreateObject(Handle %x, ObjectAttributes %x, Type %x)\n",
+ Handle, ObjectAttributes, Type);
+ if (ObjectAttributes != NULL &&
+ ObjectAttributes->ObjectName != NULL)
+ {
+ DPRINT("ObjectAttributes->ObjectName->Buffer %S\n",
+ ObjectAttributes->ObjectName->Buffer);
+ }
+
+ if (ObjectAttributes != NULL &&
+ ObjectAttributes->ObjectName != NULL)
+ {
+ Status = ObFindObject(ObjectAttributes,
+ &Parent,
+ &RemainingPath,
+ NULL);
+ if (!NT_SUCCESS(Status))
+ {
+ DPRINT("ObFindObject() failed! (Status 0x%x)\n", Status);
+ return(Status);
+ }
+ }
+ else
+ {
+ RtlInitUnicodeString(&RemainingPath, NULL);
+ }
+
+ RtlMapGenericMask(&DesiredAccess,
+ Type->Mapping);
+
+ Header = (POBJECT_HEADER)ExAllocatePoolWithTag(NonPagedPool,
+ OBJECT_ALLOC_SIZE(Type),
+ Type->Tag);
+ ObInitializeObject(Header,
+ Handle,
+ DesiredAccess,
+ Type,
+ ObjectAttributes);
+
+ if (Parent != NULL)
+ {
+ ParentHeader = BODY_TO_HEADER(Parent);
+ }
+
+ if (ParentHeader != NULL &&
+ ParentHeader->ObjectType == ObDirectoryType &&
+ RemainingPath.Buffer != NULL)
+ {
+ ObpAddEntryDirectory(Parent,
+ Header,
+ RemainingPath.Buffer+1);
+ ObjectAttached = TRUE;
+ }
+
+ if ((Header->ObjectType != NULL) &&
+ (Header->ObjectType->Create != NULL))
+ {
+ DPRINT("Calling %x\n", Header->ObjectType->Create);
+ Status = Header->ObjectType->Create(HEADER_TO_BODY(Header),
+ Parent,
+ RemainingPath.Buffer,
+ ObjectAttributes);
+ if (!NT_SUCCESS(Status))
+ {
+ if (ObjectAttached == TRUE)
+ {
+ ObpRemoveEntryDirectory(Header);
+ }
+ if (Parent)
+ {
+ ObDereferenceObject(Parent);
+ }
+ RtlFreeUnicodeString(&Header->Name);
+ RtlFreeUnicodeString(&RemainingPath);
+ ExFreePool(Header);
+ return(Status);
+ }
+ }
+ RtlFreeUnicodeString( &RemainingPath );
+
+ *Object = HEADER_TO_BODY(Header);
+
+ return(STATUS_SUCCESS);
+}
+
+
+NTSTATUS STDCALL
+ObReferenceObjectByPointer(IN PVOID Object,
+ IN ACCESS_MASK DesiredAccess,
+ IN POBJECT_TYPE ObjectType,
+ IN KPROCESSOR_MODE AccessMode)
+/*
+ * FUNCTION: Increments the pointer reference count for a given object
+ * ARGUMENTS:
+ * ObjectBody = Object's body
+ * DesiredAccess = Desired access to the object
+ * ObjectType = Points to the object type structure
+ * AccessMode = Type of access check to perform
+ * RETURNS: Status
+ */
+{
+ POBJECT_HEADER Header;
+
+// DPRINT("ObReferenceObjectByPointer(Object %x, ObjectType %x)\n",
+// Object,ObjectType);
+
+ Header = BODY_TO_HEADER(Object);
+
+ if (ObjectType != NULL && Header->ObjectType != ObjectType)
+ {
+ DPRINT("Failed %x (type was %x %S) should be %x %S\n",
+ Header,
+ Header->ObjectType,
+ Header->ObjectType->TypeName.Buffer,
+ ObjectType,
+ ObjectType->TypeName.Buffer);
+ return(STATUS_UNSUCCESSFUL);
+ }
+ if (Header->ObjectType == PsProcessType)
+ {
+ DPRINT("Ref p 0x%x refcount %d type %x ",
+ Object, Header->RefCount, PsProcessType);
+ DPRINT("eip %x\n", ((PULONG)&Object)[-1]);
+ }
+ if (Header->ObjectType == PsThreadType)
+ {
+ DPRINT("Deref t 0x%x with refcount %d type %x ",
+ Object, Header->RefCount, PsThreadType);
+ DPRINT("eip %x\n", ((PULONG)&Object)[-1]);
+ }
+
+ Header->RefCount++;
+
+ return(STATUS_SUCCESS);
+}
+
+
+NTSTATUS STDCALL
+ObOpenObjectByPointer(IN POBJECT Object,
+ IN ULONG HandleAttributes,
+ IN PACCESS_STATE PassedAccessState,
+ IN ACCESS_MASK DesiredAccess,
+ IN POBJECT_TYPE ObjectType,
+ IN KPROCESSOR_MODE AccessMode,
+ OUT PHANDLE Handle)
+{
+ NTSTATUS Status;
+
+ DPRINT("ObOpenObjectByPointer()\n");
+
+ Status = ObReferenceObjectByPointer(Object,
+ 0,
+ ObjectType,
+ AccessMode);
+ if (!NT_SUCCESS(Status))
+ {
+ return Status;
+ }
+
+ Status = ObCreateHandle(PsGetCurrentProcess(),
+ Object,
+ DesiredAccess,
+ FALSE,
+ Handle);
+
+ ObDereferenceObject(Object);
+
+ return STATUS_SUCCESS;
+}
+
+
+static NTSTATUS
+ObpPerformRetentionChecks(POBJECT_HEADER Header)
+{
+// DPRINT("ObPerformRetentionChecks(Header %x), RefCount %d, HandleCount %d\n",
+// Header,Header->RefCount,Header->HandleCount);
+
+ if (Header->RefCount < 0)
+ {
+ CPRINT("Object %x/%x has invalid reference count (%d)\n",
+ Header, HEADER_TO_BODY(Header), Header->RefCount);
+ KeBugCheck(0);
+ }
+ if (Header->HandleCount < 0)
+ {
+ CPRINT("Object %x/%x has invalid handle count (%d)\n",
+ Header, HEADER_TO_BODY(Header), Header->HandleCount);
+ KeBugCheck(0);
+ }
+
+ if (Header->RefCount == 0 &&
+ Header->HandleCount == 0 &&
+ Header->Permanent == FALSE)
+ {
+ if (Header->ObjectType != NULL &&
+ Header->ObjectType->Delete != NULL)
+ {
+ Header->ObjectType->Delete(HEADER_TO_BODY(Header));
+ }
+ if (Header->Name.Buffer != NULL)
+ {
+ ObpRemoveEntryDirectory(Header);
+ RtlFreeUnicodeString(&Header->Name);
+ }
+ DPRINT("ObPerformRetentionChecks() = Freeing object\n");
+ ExFreePool(Header);
+ }
+ return(STATUS_SUCCESS);
+}
+
+
+/**********************************************************************
+ * NAME EXPORTED
+ * ObfReferenceObject@4
+ *
+ * DESCRIPTION
+ * Increments a given object's reference count and performs
+ * retention checks.
+ *
+ * ARGUMENTS
+ * ObjectBody = Body of the object.
+ *
+ * RETURN VALUE
+ * None.
+ */
+VOID FASTCALL
+ObfReferenceObject(IN PVOID Object)
+{
+ POBJECT_HEADER Header;
+
+ assert(Object);
+
+ Header = BODY_TO_HEADER(Object);
+
+ Header->RefCount++;
+
+ ObpPerformRetentionChecks(Header);
+}
+
+
+/**********************************************************************
+ * NAME EXPORTED
+ * ObfDereferenceObject@4
+ *
+ * DESCRIPTION
+ * Decrements a given object's reference count and performs
+ * retention checks.
+ *
+ * ARGUMENTS
+ * ObjectBody = Body of the object.
+ *
+ * RETURN VALUE
+ * None.
+ */
+VOID FASTCALL
+ObfDereferenceObject(IN PVOID Object)
+{
+ POBJECT_HEADER Header;
+ extern POBJECT_TYPE PsProcessType;
+
+ assert(Object);
+
+ Header = BODY_TO_HEADER(Object);
+
+ if (Header->ObjectType == PsProcessType)
+ {
+ DPRINT("Deref p 0x%x with refcount %d type %x ",
+ Object, Header->RefCount, PsProcessType);
+ DPRINT("eip %x\n", ((PULONG)&Object)[-1]);
+ }
+ if (Header->ObjectType == PsThreadType)
+ {
+ DPRINT("Deref t 0x%x with refcount %d type %x ",
+ Object, Header->RefCount, PsThreadType);
+ DPRINT("eip %x\n", ((PULONG)&Object)[-1]);
+ }
+
+ Header->RefCount--;
+
+ ObpPerformRetentionChecks(Header);
+}
+
+
+/**********************************************************************
+ * NAME EXPORTED
+ * ObGetObjectPointerCount@4
+ *
+ * DESCRIPTION
+ * Retrieves the pointer(reference) count of the given object.
+ *
+ * ARGUMENTS
+ * ObjectBody = Body of the object.
+ *
+ * RETURN VALUE
+ * Reference count.
+ */
+ULONG STDCALL
+ObGetObjectPointerCount(PVOID Object)
+{
+ POBJECT_HEADER Header;
+
+ assert(Object);
+ Header = BODY_TO_HEADER(Object);
+
+ return(Header->RefCount);
+}
+
+
+/**********************************************************************
+ * NAME INTERNAL
+ * ObGetObjectHandleCount@4
+ *
+ * DESCRIPTION
+ * Retrieves the handle count of the given object.
+ *
+ * ARGUMENTS
+ * ObjectBody = Body of the object.
+ *
+ * RETURN VALUE
+ * Reference count.
+ */
+ULONG
+ObGetObjectHandleCount(PVOID Object)
+{
+ POBJECT_HEADER Header;
+
+ assert(Object);
+ Header = BODY_TO_HEADER(Object);
+
+ return(Header->HandleCount);
+}
+
+/* EOF */
projects / reactos.git / blobdiff