internal static void StopSession()
{
ulong sessionHandle = 0;
GetSessionHandle(ref sessionHandle);
// session not exists
if (sessionHandle == 0)
{
return;
}
// disable provider first
Guid providerGuid = new Guid(WsatProviderGuid);
uint err = SafeNativeMethods.EnableTrace(0, 0, 0, ref providerGuid, sessionHandle);
if (err == SafeNativeMethods.ERROR_SUCCESS)
{
EVENT_TRACE_PROPERTIES properties = new EVENT_TRACE_PROPERTIES(String.Empty, String.Empty);
err = SafeNativeMethods.StopTrace(0, WsatTraceSessionName, ref properties);
}
// still check for SessionExist as the StopTrace API always treats us
if (err != SafeNativeMethods.ERROR_SUCCESS || IsSessionExist())
{
if (err == SafeNativeMethods.ERROR_ACCESS_DENIED)
{
// throw access denied
throw new WsatAdminException(WsatAdminErrorCode.ETW_SESSION_ACCESS_DENIED,
SR.GetString(SR.ErrorSessionStopAccessDenied));
}
else
{
// throw general error message
throw new WsatAdminException(WsatAdminErrorCode.ETW_SESSION_ERROR,
SR.GetString(SR.ErrorSessionStop, err));
}
}
}
internal static void StartSession(uint logFileSize)
{
if (IsSessionExist())
{
return;
}
string logFileName = String.Empty;
uint logBuffers = 0;
ReadParamFromReg(out logFileName, out logBuffers);
BackUpLogFile(logFileName);
EVENT_TRACE_PROPERTIES properties = new EVENT_TRACE_PROPERTIES(WsatTraceSessionName, logFileName);
ulong sessionHandle = 0;
properties.Head.Wnode.Flags = SafeNativeMethods.WNODE_FLAG_TRACED_GUID;
properties.Head.Wnode.Guid = new Guid(WsatTraceSessionGuid);
properties.Head.Wnode.ClientContext = 1; //QPC clock resolution
properties.Head.LogFileMode = SafeNativeMethods.EVENT_TRACE_FILE_MODE_CIRCULAR | SafeNativeMethods.EVENT_TRACE_USE_PAGED_MEMORY;
properties.Head.MaximumBuffers = logBuffers;
properties.Head.MaximumFileSize = logFileSize;
uint err = SafeNativeMethods.StartTrace(out sessionHandle, WsatTraceSessionName, ref properties);
if (err != SafeNativeMethods.ERROR_SUCCESS)
{
switch (err)
{
case SafeNativeMethods.ERROR_BAD_PATHNAME:
throw new WsatAdminException(WsatAdminErrorCode.ETW_SESSION_BAD_PATHNAME,
SR.GetString(SR.ErrorSessionStartBadPathname));
case SafeNativeMethods.ERROR_DISK_FULL:
throw new WsatAdminException(WsatAdminErrorCode.ETW_SESSION_DISK_FULL,
SR.GetString(SR.ErrorSessionStartDiskFull));
case SafeNativeMethods.ERROR_FILE_NOT_FOUND:
throw new WsatAdminException(WsatAdminErrorCode.ETW_SESSION_FILE_NOT_FOUND,
SR.GetString(SR.ErrorSessionStartFileNotFound, logFileName));
case SafeNativeMethods.ERROR_PATH_NOT_FOUND:
throw new WsatAdminException(WsatAdminErrorCode.ETW_SESSION_PATH_NOT_FOUND,
SR.GetString(SR.ErrorSessionStartPathNotFound, logFileName));
default:
throw new WsatAdminException(WsatAdminErrorCode.ETW_SESSION_ERROR,
SR.GetString(SR.ErrorSessionStart, err));
}
}
Guid providerGuid = new Guid(WsatProviderGuid);
err = SafeNativeMethods.EnableTrace(1, 0, 0, ref providerGuid, sessionHandle);
if (err != SafeNativeMethods.ERROR_SUCCESS)
{
// stop trace session
EVENT_TRACE_PROPERTIES properties2 = new EVENT_TRACE_PROPERTIES(String.Empty, String.Empty);
SafeNativeMethods.StopTrace(0, WsatTraceSessionName, ref properties2);
if (err == SafeNativeMethods.ERROR_ACCESS_DENIED)
{
throw new WsatAdminException(WsatAdminErrorCode.ETW_SESSION_ACCESS_DENIED,
SR.GetString(SR.ErrorSessionEnableProviderAccessDenied));
}
else
{
throw new WsatAdminException(WsatAdminErrorCode.ETW_SESSION_ERROR,
SR.GetString(SR.ErrorSessionEnableProviderError, err));
}
}
SaveMaxTraceFileSizeToReg(logFileSize);
}
