I figured it out. This is 'nc' from the base, imported from OpenBSD 5.6.
nc has two flaws in its code: it listens with backlog=5 (not 1), and it
doesn't close the listening socket after accept, only after client is
done communicating.
Fixing these two problems makes my app work.
I first confused it with net/netcat from ports, which is totally
different codebase, and isn't duplex. Looking into their code confused
me into making original wrong assumptions.
Thanks!
Yuri
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