What    uint16
}

type RtMsghdr struct {
	Msglen    uint16
	Version   uint8
	Type      uint8
	Index     uint16
	Pad_cgo_0 [2]byte
	Flags     int32
	Addrs     int32
	Pid       int32
	Seq       int32
	Errno     int32
	Fmask     int32
	Inits     uint64
	Rmx       RtMetrics
}

type RtMetrics struct {
	Locks    uint64
	Mtu      uint64
	Hopcount uint64
	Expire   uint64

	child_tid  unsafe.Pointer // *int32
	parent_tid *int32
	flags      int32
	rtp        *rtprio
	spare      [3]uintptr
}

type thread int32 // long

type sigset struct {
	__bits [4]uint32
}

type stackt struct {
	ss_sp    uintptr
	ss_size  uintptr
	ss_flags int32
}

type siginfo struct {
	si_signo  int32
	si_errno  int32
	si_code   int32
	si_pid    int32

	Msglen   uint16
	Version  uint8
	Type     uint8
	Hdrlen   uint16
	Index    uint16
	Tableid  uint16
	Priority uint8
	Mpls     uint8
	Addrs    int32
	Flags    int32
	Fmask    int32
	Pid      int32
	Seq      int32
	Errno    int32
	Inits    uint32
	Rmx      RtMetrics
}

type RtMetrics struct {
	Pksent   uint64
	Expire   int64
	Locks    uint32
	Mtu      uint32

	child_tid  unsafe.Pointer // *int32
	parent_tid *int32
	flags      int32
	rtp        *rtprio
	spare      [3]uintptr
}

type thread int32 // long

type sigset struct {
	__bits [4]uint32
}

type stackt struct {
	ss_sp    uintptr
	ss_size  uintptr
	ss_flags int32
}

type siginfo struct {
	si_signo  int32
	si_errno  int32
	si_code   int32
	si_pid    int32

	parent_tid *int64
	flags      int32
	pad_cgo_0  [4]byte
	rtp        *rtprio
	spare      [3]uintptr
}

type thread int64 // long

type sigset struct {
	__bits [4]uint32
}

type stackt struct {
	ss_sp     uintptr
	ss_size   uintptr
	ss_flags  int32
	pad_cgo_0 [4]byte
}

type siginfo struct {
	si_signo  int32
	si_errno  int32
	si_code   int32
	si_pid    int32

import (
	"syscall"
	_ "unsafe" // for go:linkname
)

// Implemented in the runtime package.
//
//go:linkname fcntl runtime.fcntl
func fcntl(fd int32, cmd int32, arg int32) (int32, int32)

func Fcntl(fd int, cmd int, arg int) (int, error) {
	val, errno := fcntl(int32(fd), int32(cmd), int32(arg))
	if val == -1 {
		return int(val), syscall.Errno(errno)
	}
	return int(val), nil

	i := s.sparse[k]
	return i < int32(len(s.dense)) && s.dense[i].key == k
}

// get returns the value for key k, or -1 if k does
// not appear in the map.
func (s *sparseMap) get(k ID) int32 {
	i := s.sparse[k]
	if i < int32(len(s.dense)) && s.dense[i].key == k {
		return s.dense[i].val
	}
	return -1
}

func (s *sparseMap) set(k ID, v int32) {
	i := s.sparse[k]

type SecTrustSettingsResult int32

const (
	SecTrustSettingsResultInvalid SecTrustSettingsResult = iota
	SecTrustSettingsResultTrustRoot
	SecTrustSettingsResultTrustAsRoot
	SecTrustSettingsResultDeny
	SecTrustSettingsResultUnspecified
)

type SecTrustResultType int32

const (
	SecTrustResultInvalid SecTrustResultType = iota
	SecTrustResultProceed

	uc_flags    uint32
	uc_link     *ucontext
	uc_stack    stackt
	uc_mcontext sigcontext
	uc_sigmask  uint32
	__unused    [31]int32
	uc_regspace [128]uint32
}

type timeval struct {
	tv_sec  int32
	tv_usec int32
}

func (tv *timeval) set_usec(x int32) {
	tv.tv_usec = x
}

type itimerspec struct {
	it_interval timespec
	it_value    timespec
}

type itimerval struct {

	stack      uintptr
	tid1       unsafe.Pointer // *int32
	tid2       unsafe.Pointer // *int32
}

type sigset struct {
	__bits [4]uint32
}

type stackt struct {
	ss_sp     uintptr
	ss_size   uintptr
	ss_flags  int32
	pad_cgo_0 [4]byte
}

type siginfo struct {
	si_signo  int32
	si_errno  int32
	si_code   int32
	si_pid    int32
	si_uid    uint32
	si_status int32