Easy way to detect bpftrace has attached to all the probes and is ready to trace?

[0mp]

Hello!

I'm dealing with large bpftrace scripts and sometimes it takes a couple of seconds or minutes for bpftrace to start tracing. This is not an issue if I'm providing the command via -c, but I'd like to know if there is a way detect that the bpftrace program is ready to trace in general. I'd like to run my command outside of bpftrace (i.e., without using -c) but I need to know that bpftrace is ready.

Now that I think about it, I could probably use -c for that, e.g., -c "/bin/sh -c 'touch /tmp/bpftrace.ready && sleep infinity'". If there is a better way that does not feel like a hack, then please let me know.

[viktormalik]

This is an interesting point. I'd have to look more but I believe that the probes are attached in the order that they appear in the script. So, if you create a BEGIN probe as the last probe of you script and let it print something, then once the text is printed, the script should be ready.

[0mp]

Hmm, that's an interesting implementation detail that could help. Thanks.