// Get a pidfd of the current process (opening of "/proc/self" won't
	// work for waitid).
	fd, err := unix.PidFDOpen(syscall.Getpid(), 0)
	if err != nil {
		return NewSyscallError("pidfd_open", err)
	}
	defer syscall.Close(int(fd))

	// Check waitid(P_PIDFD) works.
	for {
		_, _, err = syscall.Syscall6(syscall.SYS_WAITID, _P_PIDFD, fd, 0, syscall.WEXITED, 0, 0)
		if err != syscall.EINTR {
			break
		}
	}

		}
		println("runtime: netpoll: break fd ready for", ev.ident)
		throw("runtime: netpoll: break fd ready for something unexpected")
	}
	return false
}

func drainWakeupEvent(kq int32) {
	ev := keventt{
		ident:  kqIdent,
		filter: _EVFILT_USER,
		flags:  _EV_DISABLE,
	}
	kevent(kq, &ev, 1, nil, 0, nil)
}

func netpollIsPollDescriptor(fd uintptr) bool {
	return fd == uintptr(kq)

			t.Fatalf("WriteFile: %v", err)
		}
	}

	// Read files using Getdirentries
	var names2 []string
	fd, err := syscall.Open(d, syscall.O_RDONLY, 0)
	if err != nil {
		t.Fatalf("Open: %v", err)
	}
	defer syscall.Close(fd)
	var base uintptr
	var buf [2048]byte
	for {
		n, err := syscall.Getdirentries(fd, buf[:], &base)
		if err != nil {
			t.Fatalf("Getdirentries: %v", err)
		}
		if n == 0 {
			break
		}

//
// func netpollinit()
//     Initialize the poller. Only called once.
//
// func netpollopen(fd uintptr, pd *pollDesc) int32
//     Arm edge-triggered notifications for fd. The pd argument is to pass
//     back to netpollready when fd is ready. Return an errno value.
//
// func netpollclose(fd uintptr) int32
//     Disable notifications for fd. Return an errno value.
//
// func netpoll(delta int64) (gList, int32)

//sysnb exit(res int) (err error)
//sys   ptrace(request int, pid int, addr uintptr, data uintptr) (err error)
//sysnb getentropy(p []byte) (err error)
//sys   fstatat(fd int, path string, stat *Stat_t, flags int) (err error)
//sys   unlinkat(fd int, path string, flags int) (err error)

	if pfd == nil || !pfd.IsStream || !isUnixOrTCP(string(network)) {
		return
	}

	sc, err := f.SyscallConn()
	if err != nil {
		return
	}

	rerr := sc.Read(func(fd uintptr) (done bool) {
		written, err, handled = poll.SendFile(pfd, int(fd), 1<<63-1)
		return true
	})

	if err == nil {
		err = rerr
	}

	return written, handled, wrapSyscallError("sendfile", err)
}

	return time.Duration(getTickCount64()) * time.Millisecond
}

func Ftruncate(fd Handle, length int64) (err error) {
	curoffset, e := Seek(fd, 0, 1)
	if e != nil {
		return e
	}
	defer Seek(fd, curoffset, 0)
	_, e = Seek(fd, length, 0)
	if e != nil {
		return e
	}
	e = SetEndOfFile(fd)
	if e != nil {
		return e
	}
	return nil
}

//
//go:nosplit
func mmap(addr unsafe.Pointer, n uintptr, prot, flags, fd int32, off uint32) (unsafe.Pointer, int) {
	args := struct {
		addr            unsafe.Pointer
		n               uintptr
		prot, flags, fd int32
		off             uint32
		ret1            unsafe.Pointer
		ret2            int
	}{addr, n, prot, flags, fd, off, nil, 0}
	libcCall(unsafe.Pointer(abi.FuncPCABI0(mmap_trampoline)), unsafe.Pointer(&args))

	if !ok {
		return 0, nil, false
	}

	sc, err := f.SyscallConn()
	if err != nil {
		return 0, nil, false
	}

	var werr error
	err = sc.Read(func(fd uintptr) bool {
		written, werr, handled = poll.SendFile(&c.pfd, int(fd), remain)
		return true
	})
	if err == nil {
		err = werr
	}

	if lr != nil {
		lr.N = remain - written
	}
	return written, wrapSyscallError("sendfile", err), handled

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000000e0  10 01 58 cc 03 c3 53 04  03 69 80 f4 ad 4d ce 72  |..X...S..i...M.r|
000000f0  26 4e 6c c7 2c 31 69 2b  fd 97 67 5e 7d e0 05 b3  |&Nl.,1i+..g^}...|
00000100  f4 40 64 a1 bd a3 fd a8  f9 7b 18 82 89 8f 25 f9  |.@d......{....%.|
00000110  ca ca c4 8f e4 90 7b 26  7a d5 b2 1e fa 05 db ad  |......{&z.......|