How to determine that Btrace script has successfully intruded into the code？

[jndxcaiwei]

I use the btrace script in the automated test with Linux environment.
One thread is used to run the btrace script, and the other thread performs some operations on the application to trigger the btrace. However, it is found that whether the btrace has successfully intruded into the code cannot be judged by if the PID of the btrace script process exists.
The time of each btrace intrusion into the code is inconsistent. Is there any identification indicating that the btrace has successfully worked？
Thanks a lot to your replay.

[jbachorik]

You could use eg. btrace.port system property to check whether the Btrace agent was loaded and started with the socket server.

There is no special 'event' for when a class is instrumented, I am afraid.