Function startWithPortFallback

packages/opencode/src/server/server.ts:117–122

(opts: ListenOptions)

}

function startWithPortFallback(opts: ListenOptions) {
  if (opts.port !== 0) return startListener(opts, opts.port)
  // Match the legacy listener port-resolution behavior: explicit `0` prefers
  // 4096 first, then any free port.
  return startListener(opts, 4096).pipe(Effect.catch(() => startListener(opts, 0)))
}

function startListener(opts: ListenOptions, port: number) {
  const scope = Scope.makeUnsafe()