defer f.Close()
	nonblock, err := unix.IsNonblock(int(f.Fd()))
	if err != nil {
		t.Fatal(err)
	}
	if !nonblock {
		t.Errorf("file opened with O_NONBLOCK but in blocking mode")
	}
}

func TestNewFileNonBlocking(t *testing.T) {
	var p [2]int
	if err := syscall.Pipe(p[:]); err != nil {
		t.Fatal(err)
	}
	if err := syscall.SetNonblock(p[0], true); err != nil {
		t.Fatal(err)
	}