Listen to PosixSignalRegistration for events

[bruno-garcia]

Different signals can be now received in .NET 6 through PosixSignalRegistration.
We can rely on this to close a session, flush events, add breadcrumbs etc.

This task involves exploring which events are available, what are the limitations (allocations, timing, opening connections?) with regards to code we can run in there and come out with what we can build on top of it.

See: dotnet/runtime#50527

[bitsandfoxes]

Oh wow, this is actually pretty neat! I wonder if we can rely on this as well to avoid event duplication when relying on native SDKs, i.e. #3545 (comment)

[jamescrosswell]

Looks like these are the signals you can register handlers for:

        /// <summary>Hangup</summary>
        SIGHUP = -1,

        /// <summary>Interrupt</summary>
        SIGINT = -2,

        /// <summary>Quit</summary>
        SIGQUIT = -3,

        /// <summary>Termination</summary>
        SIGTERM = -4,

I take it we're looking at ways to ensure a more graceful shutdown of Sentry when the app is about to exit here (so maybe trying to send some events rather than dump these to a file and sending them on the next program execution)? Or is there something else we could do with these?

[bitsandfoxes]

Thanks for digging those up! I think we're going to have to look at what we can do first.

what are the limitations (allocations, timing, opening connections?) with regards to code we can run in there and come out with what we can build on top of it.