Set logging env for tracee

Author: mdh1418

src/tests/tracing/eventpipe/userevents/userevents.cs

@@ -96,6 +96,18 @@ public static int TestEntryPoint()
             traceeStartInfo.RedirectStandardOutput = true;
             traceeStartInfo.RedirectStandardError = true;
 
+            string logDirectory = helixWorkItemDirectory != null && Directory.Exists(helixWorkItemDirectory)
+                ? helixWorkItemDirectory
+                : appBaseDir;
+            string logFilePath = Path.Combine(logDirectory, "userevents.log");
+
+            traceeStartInfo.Environment["DOTNET_LogEnable"] = "1";
+            traceeStartInfo.Environment["DOTNET_LogFacility"] = "0x00001000";
+            traceeStartInfo.Environment["DOTNET_LogLevel"] = "4";
+            traceeStartInfo.Environment["DOTNET_LogToFile"] = "1";
+            traceeStartInfo.Environment["DOTNET_LogFile"] = logFilePath;
+            traceeStartInfo.Environment["DOTNET_LogWithPid"] = "1";
+
             Console.WriteLine($"Starting tracee process: {traceeStartInfo.FileName} {traceeStartInfo.Arguments}");
             using Process traceeProcess = Process.Start(traceeStartInfo);
             Console.WriteLine($"Tracee process started with PID: {traceeProcess.Id}");