if err != nil {
			// Display windows errno in error message.
			errno, ok := toErrno(err)
			if !ok {
				return "", err
			}
			return "", fmt.Errorf("%v (windows errno=%d)", err, errno)
		}
		defer c.Close()

		b := make([]byte, 100)
		n, err := c.Read(b)
		if err == nil || err == io.EOF {
			return string(b[:n]), nil
		}
		errno, ok := toErrno(err)

	}
	tr := n.FuncType.Result
	if tr != nil {
		fmt.Fprintf(fgcc, "\t__typeof__(_cgo_a->r) _cgo_r;\n")
	}
	fmt.Fprintf(fgcc, "\t_cgo_tsan_acquire();\n")
	if n.AddError {
		fmt.Fprintf(fgcc, "\terrno = 0;\n")
	}
	fmt.Fprintf(fgcc, "\t")
	if tr != nil {
		fmt.Fprintf(fgcc, "_cgo_r = ")
		if c := tr.C.String(); c[len(c)-1] == '*' {
			fmt.Fprint(fgcc, "(__typeof__(_cgo_a->r)) ")
		}
	}