/*++
Copyright (c) 1989 Microsoft Corporation
Module Name:
srvobjmn.c
Abstract:
This is the local object manager module for the OS/2 Subsystem Server
Author:
Mark Lucovsky (markl) 10-Jul-1990
Environment:
User Mode Only
Revision History:
--*/
#include "os2srv.h"
NTSTATUS
Os2InitializeLocalObjectManager( VOID )
/*++
Routine Description:
This function initializes the local object manager for
named Os2 objects.
The local object directory is used to translate an object
name/type into an object handle.
Arguments:
None
Return Value:
NT_SUCCESS() - Function completed without error
!NT_SUCCESS() - Function failed
--*/
{
//
// Create a generic table for object names.
//
RtlInitializeGenericTable (
&Os2LocalObjectNames,
Os2LocalObjectCompare,
Os2LocalObjectDirentAllocate,
Os2LocalObjectDirentDeallocate,
NULL
);
return(STATUS_SUCCESS);
}
RTL_GENERIC_COMPARE_RESULTS
Os2LocalObjectCompare(
IN struct _RTL_GENERIC_TABLE *Table,
IN PVOID FirstStruct,
IN PVOID SecondStruct
)
/*++
Routine Description:
This function is called during local object name lookup to
determine if an object is in the local object directory.
Arguments:
Table - Not used
FirstStruct - Supplies the address of a local object directory entry
whose name is compared against the equvalent value in
SecondStruct.
SecondStruct - Supplies the address of a local object directory entry
whose name is compared against the equvalent value in
FirstStruct.
Return Value:
GenericLessThan - FirstStruct is less than SecondStruct
GenericGreaterThan - FirstStruct is greater than SecondStruct
GenericEqual - FirstStruct and SecondStruct are equal
--*/
{
POS2_LOCAL_OBJECT_DIRENT FirstDirent;
POS2_LOCAL_OBJECT_DIRENT SecondDirent;
LONG CompareResult;
UNREFERENCED_PARAMETER(Table);
FirstDirent = (POS2_LOCAL_OBJECT_DIRENT) FirstStruct;
SecondDirent = (POS2_LOCAL_OBJECT_DIRENT) SecondStruct;
CompareResult = RtlCompareString(
&FirstDirent->ObjectName,
&SecondDirent->ObjectName,
TRUE
);
if ( CompareResult ) {
if ( CompareResult < 0 ) {
return GenericLessThan;
} else {
return GenericGreaterThan;
}
} else {
return GenericEqual;
}
}
PVOID
Os2LocalObjectDirentAllocate(
IN struct _RTL_GENERIC_TABLE *Table,
IN CLONG ByteSize
)
/*++
Routine Description:
This function is called during local object directory entry
creation to allocate space for an object directory entry.
Arguments:
Table - Not used.
ByteSize - Supplies the amount of space to allocate to store the
directory entry.
Return Value:
NON-NULL - returns the address of the allocated dirent
--*/
{
UNREFERENCED_PARAMETER(Table);
return RtlAllocateHeap( Os2Heap, 0, ByteSize );
}
VOID
Os2LocalObjectDirentDeallocate(
IN struct _RTL_GENERIC_TABLE *Table,
IN PVOID Buffer
)
/*++
Routine Description:
This function is called to deallocate a local object dirent.
Arguments:
Table - Not Used.
Buffer - Supplies the address of the dirent to deallocate
Return Value:
None.
--*/
{
UNREFERENCED_PARAMETER(Table);
RtlFreeHeap( Os2Heap, 0, Buffer );
}
POS2_LOCAL_OBJECT_DIRENT
Os2LookupLocalObjectByName(
IN PSTRING ObjectName,
IN OS2_LOCAL_OBJECT_TYPE ObjectType
)
/*++
Routine Description:
This function looks up the specified object name in the
local object directory. If a matching object is found,
its type is checked against the specified type and the
address of the directory entry is returned.
Arguments:
ObjectName - Supplies the name of the object to lookup
in the local object directory.
ObjectType - Supplies the object type to match against. A value
of LocalObjectAnyType matches all object types (just performs
a name lookup).
Return Value:
NULL - The object was not found, or the object was found but its type
did not match.
NON-NULL - Returns a pointer to the matching directory entry.
--*/
{
POS2_LOCAL_OBJECT_DIRENT Match;
OS2_LOCAL_OBJECT_DIRENT Template;
Template.ObjectName = *ObjectName;
Match = RtlLookupElementGenericTable(
&Os2LocalObjectNames,
&Template
);
if ( Match ) {
if (ObjectType != LocalObjectAnyType) {
if ( ObjectType != Match->ObjectType ) {
Match = NULL;
}
}
}
return Match;
}
POS2_LOCAL_OBJECT_DIRENT
Os2InsertLocalObjectName(
IN PSTRING ObjectName,
IN OS2_LOCAL_OBJECT_TYPE ObjectType,
IN ULONG ObjectHandle
)
/*++
Routine Description:
This function inserts an object name into the local object
directory creating a directory entry. Duplicate names are
not supported (assertion). description-of-function.
Arguments:
ObjectName - Supplies the name of the object to insert
in the local object directory.
ObjectType - Supplies the object type to match against.
Handle - Supplies a handle to the object.
Return Value:
NON-NULL - Returns the address of the inserted dirent.
NULL - No memory to allocate the dirent exists.
--*/
{
POS2_LOCAL_OBJECT_DIRENT Match;
OS2_LOCAL_OBJECT_DIRENT Template;
BOOLEAN Inserted;
Template.ObjectType = ObjectType;
Template.ObjectName = *ObjectName;
Template.ObjectHandle = ObjectHandle;
try {
Match = RtlInsertElementGenericTable(
&Os2LocalObjectNames,
&Template,
sizeof(Template),
&Inserted
);
} except ( EXCEPTION_EXECUTE_HANDLER ) {
return NULL;
}
ASSERT(Inserted);
return Match;
}
VOID
Os2DeleteLocalObject(
IN POS2_LOCAL_OBJECT_DIRENT Dirent
)
/*++
Routine Description:
This function deletes an object directory entry (name, handle, type)
from the local object directory.
Arguments:
Dirent - Supplies the directory entry of the object to
remove from the table.
Return Value:
None.
--*/
{
BOOLEAN ret;
ret = RtlDeleteElementGenericTable(
&Os2LocalObjectNames,
Dirent
);
ASSERT(ret);
}
