//sys   munmap(addr uintptr, length uintptr) (err error)
//sys	readlen(fd int, buf *byte, nbuf int) (n int, err error) = SYS_READ
//sys	accept4(fd int, rsa *RawSockaddrAny, addrlen *_Socklen, flags int) (nfd int, err error)
//sys	utimensat(dirfd int, path string, times *[2]Timespec, flag int) (err error)
//sys	getcwd(buf []byte) (n int, err error) = SYS___GETCWD

//sys	accept(s int, rsa *RawSockaddrAny, addrlen *_Socklen) (fd int, err error) = SYS___ACCEPT_A
//sys	accept4(s int, rsa *RawSockaddrAny, addrlen *_Socklen, flags int) (fd int, err error) = SYS___ACCEPT4_A
//sys	bind(s int, addr unsafe.Pointer, addrlen _Socklen) (err error) = SYS___BIND_A
//sys	connect(s int, addr unsafe.Pointer, addrlen _Socklen) (err error) = SYS___CONNECT_A

//sys	mmap(addr uintptr, length uintptr, prot int, flag int, fd int, pos int64) (ret uintptr, err error)
//sys	munmap(addr uintptr, length uintptr) (err error)
//sys	accept4(fd int, rsa *RawSockaddrAny, addrlen *_Socklen, flags int) (nfd int, err error)

	REG_DWORD = REG_DWORD_LITTLE_ENDIAN
	REG_QWORD = REG_QWORD_LITTLE_ENDIAN
)

type AddrinfoW struct {
	Flags     int32
	Family    int32
	Socktype  int32
	Protocol  int32
	Addrlen   uintptr
	Canonname *uint16
	Addr      Pointer
	Next      *AddrinfoW
}

const (
	AI_PASSIVE     = 1
	AI_CANONNAME   = 2
	AI_NUMERICHOST = 4
)

type GUID struct {

//sys	mmap(addr uintptr, length uintptr, prot int, flag int, fd int, pos int64) (ret uintptr, err error)
//sys	munmap(addr uintptr, length uintptr) (err error)
//sys	accept4(fd int, rsa *RawSockaddrAny, addrlen *_Socklen, flags int) (nfd int, err error)

	MOVQ	name+0(FP), SI
	MOVL	mode+8(FP), DX
	MOVL	$0, R10
	MOVL	$SYS_faccessat, AX
	SYSCALL
	MOVL	AX, ret+16(FP)
	RET

// int connect(int fd, const struct sockaddr *addr, socklen_t addrlen)
TEXT runtime·connect(SB),NOSPLIT,$0-28
	MOVL	fd+0(FP), DI
	MOVQ	addr+8(FP), SI
	MOVL	len+16(FP), DX
	MOVL	$SYS_connect, AX
	SYSCALL
	MOVL	AX, ret+24(FP)
	RET

//sys	Closesocket(s Handle) (err error) [failretval==socket_error] = ws2_32.closesocket
//sys	AcceptEx(ls Handle, as Handle, buf *byte, rxdatalen uint32, laddrlen uint32, raddrlen uint32, recvd *uint32, overlapped *Overlapped) (err error) = mswsock.AcceptEx
//sys	GetAcceptExSockaddrs(buf *byte, rxdatalen uint32, laddrlen uint32, raddrlen uint32, lrsa **RawSockaddrAny, lrsalen *int32, rrsa **RawSockaddrAny, rrsalen *int32) = mswsock.GetAcceptExSockaddrs

	}
	return
}

func AcceptEx(ls Handle, as Handle, buf *byte, rxdatalen uint32, laddrlen uint32, raddrlen uint32, recvd *uint32, overlapped *Overlapped) (err error) {
	r1, _, e1 := syscall.Syscall9(procAcceptEx.Addr(), 8, uintptr(ls), uintptr(as), uintptr(unsafe.Pointer(buf)), uintptr(rxdatalen), uintptr(laddrlen), uintptr(raddrlen), uintptr(unsafe.Pointer(recvd)), uintptr(unsafe.Pointer(overlapped)), 0)
	if r1 == 0 {

//sys	Closesocket(s Handle) (err error) [failretval==socket_error] = ws2_32.closesocket
//sys	AcceptEx(ls Handle, as Handle, buf *byte, rxdatalen uint32, laddrlen uint32, raddrlen uint32, recvd *uint32, overlapped *Overlapped) (err error) = mswsock.AcceptEx
//sys	GetAcceptExSockaddrs(buf *byte, rxdatalen uint32, laddrlen uint32, raddrlen uint32, lrsa **RawSockaddrAny, lrsalen *int32, rrsa **RawSockaddrAny, rrsalen *int32) = mswsock.GetAcceptExSockaddrs

}

// AcceptEx wraps [syscall.AcceptEx].
func (sw *Switch) AcceptEx(ls syscall.Handle, as syscall.Handle, b *byte, rxdatalen uint32, laddrlen uint32, raddrlen uint32, rcvd *uint32, overlapped *syscall.Overlapped) error {
	so := sw.sockso(ls)
	if so == nil {
		return syscall.AcceptEx(ls, as, b, rxdatalen, laddrlen, raddrlen, rcvd, overlapped)
	}
	sw.fmu.RLock()
	f, _ := sw.fltab[FilterAccept]
	sw.fmu.RUnlock()

	af, err := f.apply(so)