type Cipher struct {
	s    [256]uint32
	i, j uint8
}

type KeySizeError int

func (k KeySizeError) Error() string {
	return "crypto/rc4: invalid key size " + strconv.Itoa(int(k))
}

// NewCipher creates and returns a new [Cipher]. The key argument should be the
// RC4 key, at least 1 byte and at most 256 bytes.
func NewCipher(key []byte) (*Cipher, error) {
	k := len(key)

}

// Currently, pc(2) takes over 400ns, which is too expensive
// to call it for every log message.
func BenchmarkPC(b *testing.B) {
	for depth := 0; depth < 5; depth++ {
		b.Run(strconv.Itoa(depth), func(b *testing.B) {
			b.ReportAllocs()
			var x uintptr
			for i := 0; i < b.N; i++ {
				x = callerPC(depth)
			}
			_ = x
		})
	}
}

func BenchmarkRecord(b *testing.B) {

			}
			if err := f.Close(); err != nil {
				t.Error(err)
				return
			}
		}
	}()

	dir := t.TempDir()
	<-start
	for i := 0; i < attempts; i++ {
		name := filepath.Join(dir, strconv.Itoa(i))
		if err := syscall.Mkfifo(name, 0o600); err != nil {
			t.Fatal(err)
		}
		// The problem only occurs if we use O_NONBLOCK here.
		rd, err := os.OpenFile(name, os.O_RDONLY|syscall.O_NONBLOCK, 0o600)