I have an existing c++ app that is entirely event-loop driven with epoll and I am trying to figure out how to integrate Racket in the same thread and allow the existing code to work as-is. I have read the docs about the C api and the FFI but so far a straightforward and clean option is not apparent to me. The 'embedding' examples that I see appear rather opaque to me and at best seem to be geared towards an external loop based on select() rather than epoll(), so I'm assuming that the more straightforward approach would be to add the existing event handlers onto Racket's event system. To that end, it seems there should be a way to register the fd's of interest with Racket and receive a callback when they are read-ready but I can't see a way to do that. For example, how would I maintain a list of fds to pass to (sync) if I went that route? Or if it's better to work it the other way, how would I call (sync) from c code and apply the list of fds to it? I vaguely can see a way towards it but it seems at best super inefficient. Any thoughts or suggestions would be greatly appreciated!
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