Do you mean like tcp half-close?

On Thu, May 30, 2019, 5:40 PM David Collier-Brown <dav...@spamcop.net>
wrote:

> My leaky brain has lost an old technique...
>
> Once upon a time, I would send an old copy of a program a SIGHUP, and it
> would shut down a socket listening on, for example, port 25 (SMTP). A newer
> release of the program would succeeding in binding to port 25, taking over
> any new connection requests. When the old program closed it's last email
> transfer, it would then exit.
>
> The idea was to update a (mail-)server implementation without losing
> transactions.
>
> I can no longer find the code I once used, nor other people's examples,
> much less modern Golang examples!
>
> Please tell me we haven't lost this technique (:-()
>
> --dave
>
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