posix signal handling

[marcinpiotrsobczyk]

I have a problem while implementing posix signal handling. Application needs to perform some cleanup on exit / for example on terminal close by (x). By now its solved with installing standard python signal handler with asyncio library. Handler is async function so handler is in form lambda: asyncio.create_task(_shutdown_gracefully()) . But im afraid this is fragile solution which might break with future versions of textual (??). Maybe there is better solution for signal handling? It would be useful to have smth like that built in textual.

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