Ngroups int16
	Groups  [16]uint32
	_       *byte
}

type Linger struct {
	Onoff  int32
	Linger int32
}

type Iovec struct {
	Base *byte
	Len  uint64
}

type IPMreq struct {
	Multiaddr [4]byte /* in_addr */
	Interface [4]byte /* in_addr */
}

type IPMreqn struct {
	Multiaddr [4]byte /* in_addr */
	Address   [4]byte /* in_addr */
	Ifindex   int32
}

	"fmt"
)

// Gob codec version. Permits backward-compatible changes to the encoding.
const intGobVersion byte = 1

// GobEncode implements the [encoding/gob.GobEncoder] interface.
func (x *Int) GobEncode() ([]byte, error) {
	if x == nil {
		return nil, nil
	}
	buf := make([]byte, 1+len(x.abs)*_S) // extra byte for version and sign bit
	i := x.abs.bytes(buf) - 1            // i >= 0

	F_asyncwrites uint64
	F_asyncreads  uint64
	F_fsid        Fsid
	F_namemax     uint32
	F_owner       uint32
	F_ctime       uint64
	F_fstypename  [16]byte
	F_mntonname   [90]byte
	F_mntfromname [90]byte
	F_mntfromspec [90]byte
	_             [2]byte
	Mount_info    [160]byte
}

type Flock_t struct {
	Start  int64
	Len    int64
	Pid    int32
	Type   int16
	Whence int16
}

type Dirent struct {

)

type FdSet struct {
	Bits [1024]int64
}

type Utsname struct {
	Sysname  [257]byte
	Nodename [257]byte
	Release  [257]byte
	Version  [257]byte
	Machine  [257]byte
}

type Ustat_t struct {
	Tfree  int64
	Tinode uint64
	Fname  [6]int8
	Fpack  [6]int8
	_      [4]byte
}

const (
	AT_FDCWD            = 0xffd19553
	AT_SYMLINK_NOFOLLOW = 0x1000

	Arsize   [20]byte // File member size
	Arnxtmem [20]byte // Next member pointer
	Arprvmem [20]byte // Previous member pointer
	Ardate   [12]byte // File member date
	Aruid    [12]byte // File member uid
	Argid    [12]byte // File member gid
	Armode   [12]byte // File member mode (octal)
	Arnamlen [4]byte  // File member name length
	// _ar_nam is removed because it's easier to get name without it.
}

	rb := New(1024)
	data := []byte(strings.Repeat("a", 512))
	buf := make([]byte, 512)

	b.ResetTimer()
	for i := 0; i < b.N; i++ {
		rb.Write(data)
		rb.Read(buf)
	}
}

func BenchmarkRingBuffer_AsyncRead(b *testing.B) {
	// Pretty useless benchmark, but it's here for completeness.
	rb := New(1024)
	data := []byte(strings.Repeat("a", 512))
	buf := make([]byte, 512)

	go func() {
		for {

	// Playback header: 0 0 P B <8-byte time> <4-byte data length> (big endian)
	var buf [4 + 8 + 4]byte
	buf[2] = 'P'
	buf[3] = 'B'
	tu := uint64(t)
	buf[4] = byte(tu >> (7 * 8))
	buf[5] = byte(tu >> (6 * 8))
	buf[6] = byte(tu >> (5 * 8))
	buf[7] = byte(tu >> (4 * 8))
	buf[8] = byte(tu >> (3 * 8))
	buf[9] = byte(tu >> (2 * 8))
	buf[10] = byte(tu >> (1 * 8))
	buf[11] = byte(tu >> (0 * 8))
	nu := uint32(n)

	return &d, nil
}

// pbit8 copies the 8-bit number v to b and returns the remaining slice of b.
func pbit8(b []byte, v uint8) []byte {
	b[0] = byte(v)
	return b[1:]
}

// pbit16 copies the 16-bit number v to b in little-endian order and returns the remaining slice of b.
func pbit16(b []byte, v uint16) []byte {
	byteorder.LePutUint16(b, v)
	return b[2:]
}

	Version uint8
	Type    uint8
	Addrs   int32
	Flags   int32
	Index   uint16
	Addrlen uint8
	_       [1]byte
}

type FdSet struct {
	Bits [1024]int64
}

type Utsname struct {
	Sysname  [32]byte
	Nodename [32]byte
	Release  [32]byte
	Version  [32]byte
	Machine  [32]byte
}

type Ustat_t struct{}

type Sigset_t struct {
	Set [4]uint64
}

const (

	sink = &([]byte(s))[10] // ERROR "\(\[\]byte\)\(s\) escapes to heap"
}

func h(out []byte, s string) { // ERROR "mutates param: out derefs=0" "s does not escape, mutate, or call"
	copy(out, []byte(s)) // ERROR "zero-copy string->\[\]byte conversion" "\(\[\]byte\)\(s\) does not escape"
}

func i(s string) byte { // ERROR "s does not escape, mutate, or call"