[Python] Send signal (SIGINT) to a C sub-process

I use some Python bindings to a C++ based library which starts some processes.

I have the problem that while the execution is within that code-path it does not "feel" a SIGINT, but as soon that context is finished, the Python process the SIGINT and use my defined handler. What is the proper procedure to "broadcast" a signal to all running sub-processes?

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