Expose erldns:stop_listeners/0 - #363
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The mirror of start_listeners/0: an embedding application that defers the listeners at boot (autostart_listeners=false) until its own resources are up has no way to close them again before those resources are torn down, so a query served during shutdown can reach a pipeline stage whose ETS tables have already died with their owner. stop_listeners/0 terminates the erldns_listeners child, keeping its spec, and start_listeners/0 now falls back to restart_child/2 when the spec is present, so the pair is symmetric.
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The mirror of start_listeners/0: an embedding application that defers the listeners at boot (autostart_listeners=false) until its own resources are up has no way to close them again before those resources are torn down, so a query served during shutdown can reach a pipeline stage whose ETS tables have already died with their owner.
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