Function IsPortInUse

src/common/io_util.cc:366–370

}

bool IsPortInUse(uint32_t port) {
  auto s = SockConnect("0.0.0.0", port);
  if (s) close(*s);
  return s.IsOK();
}

/* Wait for milliseconds until the given file descriptor becomes
 * writable/readable/exception */