EtwEventProvider.cs

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namespace System.Diagnostics.Tracing;
 
internal sealed class EtwEventProvider : IEventProvider
{
    unsafe uint IEventProvider.EventRegister(EventSource eventSource, Interop.Advapi32.EtwEnableCallback enableCallback, void* callbackContext, ref long registrationHandle)
    {
        Guid providerId = eventSource.Guid;
        return Interop.Advapi32.EventRegister(in providerId, enableCallback, callbackContext, ref registrationHandle);
    }
 
    uint IEventProvider.EventUnregister(long registrationHandle)
    {
        return Interop.Advapi32.EventUnregister(registrationHandle);
    }
 
    unsafe EventProvider.WriteEventErrorCode IEventProvider.EventWriteTransfer(long registrationHandle, in EventDescriptor eventDescriptor, IntPtr eventHandle, Guid* activityId, Guid* relatedActivityId, int userDataCount, EventProvider.EventData* userData)
    {
        switch (Interop.Advapi32.EventWriteTransfer(registrationHandle, in eventDescriptor, activityId, relatedActivityId, userDataCount, userData))
        {
        case 234:
        case 534:
            return EventProvider.WriteEventErrorCode.EventTooBig;
        case 8:
            return EventProvider.WriteEventErrorCode.NoFreeBuffers;
        default:
            return EventProvider.WriteEventErrorCode.NoError;
        }
    }
 
    unsafe IntPtr IEventProvider.DefineEventHandle(uint eventID, string eventName, long keywords, uint eventVersion, uint level, byte* pMetadata, uint metadataLength)
    {
        throw new NotSupportedException();
    }
}