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972c4594b6
resolvePortPid shelled out to lsof alone. On a host without it, spawn raises ENOENT, the error handler turned that into null, and the caller could not tell 'nothing holds this port' from 'I have no way to look' - so a service adopted on a supervisor restart kept pid: null forever, silently, which is the regression the adopt-branch test guards against. Probes lsof, then ss, then netstat, sharing one deadline so the whole lookup still costs at most PID_RESOLVE_TIMEOUT_MS. Output parsing for each is a pure exported function so the formats are unit-testable without the binary being installed. netstat cannot filter by port, so its parser matches the local-address column rather than scanning the line, keeping a foreign address that ends in the same number from being read as a listener.