JDevlieghere wrote:

> We do support the `startDebugging` reverse request 
> https://microsoft.github.io/debug-adapter-protocol/specification#Reverse_Requests_StartDebugging.
>  I use this to attach to multiple processes when tests are running from some 
> scripts that involve multiple processes. I use the script hook we have
> 
> https://github.com/llvm/llvm-project/blob/680b3b742da02972bc0b5298b6f472d2b95ca90a/lldb/tools/lldb-dap/DAP.h#L135
> 
> to call this from a python script. With the lldb-dap server mode we can 
> handle multiple DAP sessions from the same binary, or you can have lldb-dap 
> launch one instance per debug session. The DAP doesn't really have a way to 
> have multiple processes per debug session, but it does allow for multiple 
> debug sessions in general. Compound launch configurations are one way to get 
> this setup 
> https://code.visualstudio.com/docs/debugtest/debugging-configuration#_compound-launch-configurations
>  for example, you could have a server and a client in a compound launch 
> configuration.

Cool, I knew we supported the request but I didn't know how that was hooked up. 
So it seems like this may be better supported than I thought. In that case we 
should definitely make sure we test that configuration and make sure it keeps 
working.

https://github.com/llvm/llvm-project/pull/140142
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