Pim van Pelt 589030cb00 doc-fix: clarify UDP listener handles multi-source peers ...

No runtime change — the listener already uses net.ListenUDP +
ReadFromUDP, which is the unconnected-socket pattern that accepts
datagrams from any source. nginx reloads (new workers with fresh
ephemeral source ports) are handled transparently.

- udp.go: expanded comment on Run() explaining the design choice and
  contrasting with the `nc -k -u -l` latching quirk (which is an nc
  bug, not a kernel behaviour).
- udp_test.go: new TestUDPListenerMultipleSources regresses against
  the multi-worker scenario by sending from three independent
  ListenPacket sockets (three different ephemeral source ports).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

2026-04-17 10:39:34 +02:00

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