k.Ident = uint64(fd)
	k.Filter = int16(mode)
	k.Flags = uint16(flags)
}

func (iov *Iovec) SetLen(length int) {
	iov.Len = uint64(length)
}

func (msghdr *Msghdr) SetControllen(length int) {
	msghdr.Controllen = uint32(length)
}

func (cmsg *Cmsghdr) SetLen(length int) {
	cmsg.Len = uint32(length)
}

func sendfile(outfd int, infd int, offset *int64, count int) (written int, err error) {

	return Timeval{Sec: int64(sec), Usec: int32(usec)}
}

func (iov *Iovec) SetLen(length int) {
	iov.Len = uint64(length)
}

func (msghdr *Msghdr) SetControllen(length int) {
	msghdr.Controllen = uint32(length)
}

func (msghdr *Msghdr) SetIovlen(length int) {
	msghdr.Iovlen = int32(length)
}

func (cmsg *Cmsghdr) SetLen(length int) {
	cmsg.Len = uint32(length)
}

// rest to ssagen.
//
// For race detector, expand append(src, a [, b]* ) to
//
//	init {
//	  s := src
//	  const argc = len(args) - 1
//	  newLen := s.len + argc
//	  if uint(newLen) <= uint(s.cap) {
//	    s = s[:newLen]
//	  } else {
//	    s = growslice(s.ptr, newLen, s.cap, argc, elemType)
//	  }
//	  s[s.len - argc] = a
//	  s[s.len - argc + 1] = b
//	  ...
//	}
//	s

//sys	Seek(fd int, offset int64, whence int) (newoffset int64, err error) = SYS_LSEEK
//sys	getcwd(buf []byte) (n int, err error) = SYS___GETCWD

// sysctl without depending on x/sys/unix.

const (
	_CTL_QUERY = -2

	_SYSCTL_VERS_1 = 0x1000000
)

var _zero uintptr

func sysctl(mib []int32, old *byte, oldlen *uintptr, new *byte, newlen uintptr) (err error) {
	var _p0 unsafe.Pointer
	if len(mib) > 0 {
		_p0 = unsafe.Pointer(&mib[0])
	} else {
		_p0 = unsafe.Pointer(&_zero)
	}
	_, _, errno := syscall.Syscall6(
		syscall.SYS___SYSCTL,

// authentication.
func UnixCredentials(ucred *Ucred) []byte {
	b := make([]byte, CmsgSpace(SizeofUcred))
	h := (*Cmsghdr)(unsafe.Pointer(&b[0]))
	h.Level = SOL_SOCKET
	h.Type = SCM_CREDENTIALS
	h.SetLen(CmsgLen(SizeofUcred))
	*(*Ucred)(h.data(0)) = *ucred
	return b
}

// ParseUnixCredentials decodes a socket control message that contains
// credentials in a Ucred structure. To receive such a message, the

//	}
//
//	struct nlattr{
//	    __u16 nla_len:      13
//	    __u16 nla_type:     NFACCT_NAME
//	    char data:          dummy-metric\0
//	}
//
//	(padding:)
//	    data:               \0\0\0
//
//	struct nlattr{
//	    __u16 nla_len:      12
//	    __u16 nla_type:     NFACCT_PKTS
//	    __u64: data:        123
//	}
//
//	struct nlattr{
//	    __u16 nla_len:      12

	get_tls(AX)
	MOVQ	g(AX), BX
	MOVQ	g_m(BX), BX
	MOVQ	(m_mOS+mOS_errstr)(BX), CX
	MOVQ	CX, 0(SP)
	MOVQ	$ERRMAX, 8(SP)
	CALL	errstr<>(SB)
	CALL	runtime·findnull(SB)
	MOVQ	8(SP), AX
	MOVQ	AX, ret_len+8(FP)
	MOVQ	0(SP), AX
	MOVQ	AX, ret_base+0(FP)
	RET

// never called on this platform
TEXT ·sigpanictramp(SB),NOSPLIT,$0-0

func (s *emitState) openMetaFile(metaHash [16]byte, metaLen uint64) error {

	// Open meta-outfile for reading to see if it exists.
	fn := fmt.Sprintf("%s.%x", coverage.MetaFilePref, metaHash)
	s.mfname = filepath.Join(s.outdir, fn)
	fi, err := os.Stat(s.mfname)
	if err != nil || fi.Size() != int64(metaLen) {
		// We need a new meta-file.

Rematerializer::FindBestRemat(const SizeT min_savings, const int begin_len,
                              const int end_len) const {
  const auto peak = GetPeakMemory();
  SizeT best_peak_mem = peak.size;
  RematSpec best_remat = {};

  for (int len = begin_len; len < end_len; ++len) {
    std::vector<std::tuple<SizeT, int, int>> pre_screen;
    for (int begin = 0, end = begin + len; end <= peak.op_index;