s = strings.Replace(s, "X__val", "MKPOSTFSIDVAL", 1)
		s = strings.Replace(s, "X__ifi_pad", "MKPOSTIFIPAD", 1)
		s = strings.Replace(s, "X_f", "MKPOSTSYSINFOTF", 1)

		// Replace other unwanted fields with blank identifiers.
		re = regexp.MustCompile("X_[A-Za-z0-9_]*")
		s = re.ReplaceAllString(s, "_")

		// Restore preserved fields.
		s = strings.Replace(s, "MKPOSTFSIDVAL", "X__val", 1)

//sys	sendmsg(s int, msg *Msghdr, flags int) (n int, err error)
//sys	mmap(addr uintptr, length uintptr, prot int, flags int, fd int, offset int64) (xaddr uintptr, err error)

type sigset_t struct {
	X__val [16]uint64
}

//sys	pselect(nfd int, r *FdSet, w *FdSet, e *FdSet, timeout *Timespec, sigmask *sigset_t) (n int, err error) = SYS_PSELECT6

	Spare   [4]int64
}

type Dirent struct {
	Ino       uint64
	Off       int64
	Reclen    uint16
	Type      uint8
	Name      [256]uint8
	Pad_cgo_0 [5]byte
}

type Fsid struct {
	X__val [2]int32
}

type Flock_t struct {
	Type      int16
	Whence    int16
	Pad_cgo_0 [4]byte
	Start     int64
	Len       int64
	Pid       int32
	Pad_cgo_1 [4]byte
}

	Spare   [4]int64
}

type Dirent struct {
	Ino       uint64
	Off       int64
	Reclen    uint16
	Type      uint8
	Name      [256]int8
	Pad_cgo_0 [5]byte
}

type Fsid struct {
	X__val [2]int32
}

type Flock_t struct {
	Type      int16
	Whence    int16
	Pad_cgo_0 [4]byte
	Start     int64
	Len       int64
	Pid       int32
	Pad_cgo_1 [4]byte
}

	Spare   [4]int64
}

type Dirent struct {
	Ino       uint64
	Off       int64
	Reclen    uint16
	Type      uint8
	Name      [256]int8
	Pad_cgo_0 [5]byte
}

type Fsid struct {
	X__val [2]int32
}

type Flock_t struct {
	Type      int16
	Whence    int16
	Start     int64
	Len       int64
	Pid       int32
	Pad_cgo_0 [4]byte
}

type RawSockaddrInet4 struct {

	Spare   [5]int64
}

type Dirent struct {
	Ino       uint64
	Off       int64
	Reclen    uint16
	Type      uint8
	Name      [256]int8
	Pad_cgo_0 [5]byte
}

type Fsid struct {
	X__val [2]int32
}

type Flock_t struct {
	Type      int16
	Whence    int16
	Pad_cgo_0 [4]byte
	Start     int64
	Len       int64
	Pid       int32
	Pad_cgo_1 [4]byte
}

//sys	sendmsg(s int, msg *Msghdr, flags int) (n int, err error)
//sys	mmap(addr uintptr, length uintptr, prot int, flags int, fd int, offset int64) (xaddr uintptr, err error)

type sigset_t struct {
	X__val [16]uint64
}

//sys	pselect(nfd int, r *FdSet, w *FdSet, e *FdSet, timeout *Timespec, sigmask *sigset_t) (n int, err error) = SYS_PSELECT6

	Pad_cgo_0 [4]byte
}

type Dirent struct {
	Ino       uint64
	Off       int64
	Reclen    uint16
	Type      uint8
	Name      [256]uint8
	Pad_cgo_0 [5]byte
}

type Fsid struct {
	X__val [2]int32
}

type Flock_t struct {
	Type      int16
	Whence    int16
	Pad_cgo_0 [4]byte
	Start     int64
	Len       int64
	Pid       int32
	Pad_cgo_1 [4]byte
}

	Spare   [5]int64
}

type Dirent struct {
	Ino       uint64
	Off       int64
	Reclen    uint16
	Type      uint8
	Name      [256]int8
	Pad_cgo_0 [5]byte
}

type Fsid struct {
	X__val [2]int32
}

type Flock_t struct {
	Type      int16
	Whence    int16
	Pad_cgo_0 [4]byte
	Start     int64
	Len       int64
	Pid       int32
	Pad_cgo_1 [4]byte
}

	Spare   [4]int64
}

type Dirent struct {
	Ino       uint64
	Off       int64
	Reclen    uint16
	Type      uint8
	Name      [256]uint8
	Pad_cgo_0 [5]byte
}

type Fsid struct {
	X__val [2]int32
}

type Flock_t struct {
	Type      int16
	Whence    int16
	Pad_cgo_0 [4]byte
	Start     int64
	Len       int64
	Pid       int32
	Pad_cgo_1 [4]byte
}