142 lines
3.2 KiB
C
142 lines
3.2 KiB
C
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/*++
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Copyright (c) 1989 Microsoft Corporation
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Module Name:
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eventid.c
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Abstract:
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This module implements a data base for Event Ids for use by the Rtl
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Event package. This insures that Event Ids are global for the system.
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Author:
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Steve Wood (stevewo) 16-Sep-1993
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Revision History:
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--*/
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#include "exp.h"
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#if DBG
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FAST_MUTEX ExpEventIdListMutex;
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LIST_ENTRY ExpEventIdListHead;
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ULONG ExpNextEventId;
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BOOLEAN
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ExpInitializeEventIds( VOID )
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{
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ExInitializeFastMutex( &ExpEventIdListMutex );
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InitializeListHead( &ExpEventIdListHead );
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ExpNextEventId = 1;
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return TRUE;
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}
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PRTL_EVENT_ID_INFO
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ExDefineEventId(
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IN PRTL_EVENT_ID_INFO EventId
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)
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{
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PLIST_ENTRY Head, Next;
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PRTL_EVENT_ID_INFO EventId1;
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ExAcquireFastMutex( &ExpEventIdListMutex );
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try {
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Head = &ExpEventIdListHead;
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Next = Head->Flink;
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while (Next != Head) {
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EventId1 = CONTAINING_RECORD( Next, RTL_EVENT_ID_INFO, Entry );
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if (EventId->EventId == 0) {
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if (!_stricmp( EventId->Name, EventId1->Name )) {
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EventId->EventId = EventId1->EventId;
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EventId = EventId1;
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leave;
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}
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}
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else
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if (EventId->EventId == EventId1->EventId) {
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EventId = EventId1;
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leave;
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}
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Next = Next->Flink;
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}
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if (ExpNextEventId > 0xFFFF) {
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EventId = NULL;
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leave;
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}
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EventId->EventId = (USHORT)ExpNextEventId++;
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InsertTailList( &ExpEventIdListHead, &EventId->Entry );
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}
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finally {
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ExReleaseFastMutex( &ExpEventIdListMutex );
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}
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return EventId;
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}
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NTSTATUS
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ExpQueryEventIds(
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OUT PRTL_EVENT_ID_INFO EventIds,
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IN ULONG EventIdsLength,
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OUT PULONG ReturnLength OPTIONAL
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)
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{
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NTSTATUS Status;
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PLIST_ENTRY Head, Next;
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PRTL_EVENT_ID_INFO EventId;
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ULONG TotalLength;
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ExAcquireFastMutex( &ExpEventIdListMutex );
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Status = STATUS_SUCCESS;
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try {
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Head = &ExpEventIdListHead;
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Next = Head->Flink;
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TotalLength = sizeof( ULONG );
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while (Next != Head) {
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EventId = CONTAINING_RECORD( Next, RTL_EVENT_ID_INFO, Entry );
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TotalLength += EventId->Length;
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Next = Next->Flink;
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}
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if (ARGUMENT_PRESENT( ReturnLength )) {
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*ReturnLength = TotalLength;
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}
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if (TotalLength > EventIdsLength) {
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Status = STATUS_INFO_LENGTH_MISMATCH;
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leave;
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}
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Head = &ExpEventIdListHead;
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Next = Head->Flink;
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TotalLength = 0;
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while (Next != Head) {
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EventId = CONTAINING_RECORD( Next, RTL_EVENT_ID_INFO, Entry );
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RtlMoveMemory( (PCHAR)EventIds + TotalLength,
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EventId,
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EventId->Length
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);
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TotalLength += EventId->Length;
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Next = Next->Flink;
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}
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RtlZeroMemory( (PCHAR)EventIds + TotalLength, sizeof( ULONG ) );
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}
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finally {
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ExReleaseFastMutex( &ExpEventIdListMutex );
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}
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return Status;
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}
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#endif // DBG
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