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I have a c++ application linked against some c libraries.
Are there possible approaches to encapsulate the signal handling in a C++ class, so it could be handled as a c++ exception?
You can’t and if you could a lot of things would break.
What you should do is set a flag in the signal handler, periodically check in your code and throw an exception when you detect the flag is set.
Such an approach is similar to how threads get interrupted in Boost.Threads, which I strongly suggest you study.