_PORT_ALERT_UPDATE = 0x2
)

type semt struct {
	sem_count uint32
	sem_type  uint16
	sem_magic uint16
	sem_pad1  [3]uint64
	sem_pad2  [2]uint64
}

type sigset struct {
	__sigbits [4]uint32
}

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

type siginfo struct {
	si_signo int32
	si_code  int32
	si_errno int32