var family int32 = syscall.AF_UNSPEC
	switch ipVersion(network) {
	case '4':
		family = syscall.AF_INET
	case '6':
		family = syscall.AF_INET6
	}

	getaddr := func() ([]IPAddr, error) {
		if err := acquireThread(ctx); err != nil {
			return nil, &DNSError{
				Name:      name,
				Err:       mapErr(err).Error(),
				IsTimeout: ctx.Err() == context.DeadlineExceeded,