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RaduBerinde
49e0c36a0f
`WithOnListen` tells an embedder when the S3 server is serving, but not where: the callback takes no arguments, and the server reports the addresses it bound nowhere else. An embedder that wants an ephemeral port therefore cannot ask for port 0; it has to pick a free port itself, release it, and pass it in, which loses to any other process that binds the same port in between. Add `WithOnListenAddrs`, which passes the callback the address of every listener the server bound, in port-specification order, so an embedder can serve on `127.0.0.1:0` and learn the port the kernel chose. `WithOnListen` is unchanged. `MultiListener` gains `Addrs`, the every-listener counterpart of `Addr`, to supply them.