EventPipeEventProvider.cs

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namespace System.Diagnostics.Tracing;
 
internal sealed class EventPipeEventProvider : IEventProvider
{
    private IntPtr m_provHandle = IntPtr.Zero;
 
    unsafe uint IEventProvider.EventRegister(EventSource eventSource, Interop.Advapi32.EtwEnableCallback enableCallback, void* callbackContext, ref long registrationHandle)
    {
        uint result = 0u;
        m_provHandle = EventPipeInternal.CreateProvider(eventSource.Name, enableCallback);
        if (m_provHandle != IntPtr.Zero)
        {
            registrationHandle = 1L;
        }
        else
        {
            result = 1u;
        }
        return result;
    }
 
    uint IEventProvider.EventUnregister(long registrationHandle)
    {
        EventPipeInternal.DeleteProvider(m_provHandle);
        return 0u;
    }
 
    unsafe EventProvider.WriteEventErrorCode IEventProvider.EventWriteTransfer(long registrationHandle, in EventDescriptor eventDescriptor, IntPtr eventHandle, Guid* activityId, Guid* relatedActivityId, int userDataCount, EventProvider.EventData* userData)
    {
        if (eventHandle != IntPtr.Zero)
        {
            if (userDataCount == 0)
            {
                EventPipeInternal.WriteEventData(eventHandle, null, 0u, activityId, relatedActivityId);
                return EventProvider.WriteEventErrorCode.NoError;
            }
            if (eventDescriptor.Channel == 11)
            {
                userData += 3;
                userDataCount -= 3;
            }
            EventPipeInternal.WriteEventData(eventHandle, userData, (uint)userDataCount, activityId, relatedActivityId);
        }
        return EventProvider.WriteEventErrorCode.NoError;
    }
 
    unsafe IntPtr IEventProvider.DefineEventHandle(uint eventID, string eventName, long keywords, uint eventVersion, uint level, byte* pMetadata, uint metadataLength)
    {
        return EventPipeInternal.DefineEvent(m_provHandle, eventID, keywords, eventVersion, level, pMetadata, metadataLength);
    }
 
    internal static int EventActivityIdControl(Interop.Advapi32.ActivityControl ControlCode, ref Guid ActivityId)
    {
        return EventPipeInternal.EventActivityIdControl((uint)ControlCode, ref ActivityId);
    }
}