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netx: add SetTCPUserTimeout to drop dead TCP connections fast - #2
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When a peer disappears without closing the connection (e.g. its node loses its network), Linux retries unacknowledged data for ~15 min (tcp_retries2) before the call fails. SetTCPUserTimeout sets TCP_USER_TIMEOUT so the kernel drops the connection after the given time instead. Linux only; a no-op elsewhere. Meant for pgx's AfterNetConnect hook in the services that talk to Postgres. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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When a peer disappears without closing the connection (e.g. its node
loses its network), Linux retries unacknowledged data for ~15 min
(tcp_retries2) before the call fails. SetTCPUserTimeout sets
TCP_USER_TIMEOUT so the kernel drops the connection after the given
time instead. Linux only; a no-op elsewhere. Meant for pgx's
AfterNetConnect hook in the services that talk to Postgres.
Co-Authored-By: Claude Opus 5.5 noreply@anthropic.com