defer ln.Close()

		cc1, err := ln.(*TCPListener).SyscallConn()
		if err != nil {
			t.Fatal(err)
		}
		if err := controlRawConn(cc1, ln.Addr()); err != nil {
			t.Fatal(err)
		}

		c, err := Dial(ln.Addr().Network(), ln.Addr().String())
		if err != nil {
			t.Fatal(err)
		}
		defer c.Close()

		cc2, err := c.(*TCPConn).SyscallConn()
		if err != nil {
			t.Fatal(err)
		}

func TestAppendPortIfNeeded(t *testing.T) {
	testCases := []struct {
		name   string
		addr   string
		port   int32
		expect string
	}{
		{
			name:   "IPv4 all-zeros bind address has port",
			addr:   "0.0.0.0:12345",
			port:   23456,
			expect: "0.0.0.0:12345",
		},
		{
			name:   "non-zeros IPv4 config",
			addr:   "9.8.7.6",
			port:   12345,
			expect: "9.8.7.6:12345",
		},
		{

	if err != nil {
		return Data{}, fmt.Errorf("CreateFileMapping %s: %w", f.Name(), err)
	}

	addr, err := syscall.MapViewOfFile(h, syscall.FILE_MAP_READ, 0, 0, 0)
	if err != nil {
		return Data{}, fmt.Errorf("MapViewOfFile %s: %w", f.Name(), err)
	}
	var info windows.MemoryBasicInformation
	err = windows.VirtualQuery(addr, &info, unsafe.Sizeof(info))
	if err != nil {
		return Data{}, fmt.Errorf("VirtualQuery %s: %w", f.Name(), err)

	SYS_MUNMAP         = 73  // { int sys_munmap(void *addr, size_t len); }
	SYS_MPROTECT       = 74  // { int sys_mprotect(void *addr, size_t len, \
	SYS_MADVISE        = 75  // { int sys_madvise(void *addr, size_t len, \
	SYS_UTIMES         = 76  // { int sys_utimes(const char *path, \
	SYS_FUTIMES        = 77  // { int sys_futimes(int fd, \
	SYS_MQUERY         = 78  // { void *sys_mquery(void *addr, size_t len, int prot, \

		return &OpError{Op: "set", Net: c.fd.net, Source: c.fd.laddr, Addr: c.fd.raddr, Err: err}
	}
	if err := setKeepAliveIdle(c.fd, config.Idle); err != nil {
		return &OpError{Op: "set", Net: c.fd.net, Source: c.fd.laddr, Addr: c.fd.raddr, Err: err}
	}
	if err := setKeepAliveInterval(c.fd, config.Interval); err != nil {
		return &OpError{Op: "set", Net: c.fd.net, Source: c.fd.laddr, Addr: c.fd.raddr, Err: err}
	}

	LOCK
	ANDB	BX, (AX)
	RET

// func Or(addr *uint32, v uint32)
TEXT ·Or(SB), NOSPLIT, $0-12
	MOVQ	ptr+0(FP), AX
	MOVL	val+8(FP), BX
	LOCK
	ORL	BX, (AX)
	RET

// func And(addr *uint32, v uint32)
TEXT ·And(SB), NOSPLIT, $0-12
	MOVQ	ptr+0(FP), AX
	MOVL	val+8(FP), BX
	LOCK
	ANDL	BX, (AX)
	RET

// func Or32(addr *uint32, v uint32) old uint32
TEXT ·Or32(SB), NOSPLIT, $0-20

		case _C_AF_INET:
			sa := (*syscall.RawSockaddrInet4)(unsafe.Pointer(*_C_ai_addr(r)))
			addr := IPAddr{IP: copyIP(sa.Addr[:])}
			addrs = append(addrs, addr)
		case _C_AF_INET6:
			sa := (*syscall.RawSockaddrInet6)(unsafe.Pointer(*_C_ai_addr(r)))
			addr := IPAddr{IP: copyIP(sa.Addr[:]), Zone: zoneCache.name(int(sa.Scope_id))}
			addrs = append(addrs, addr)
		}
	}
	return addrs, nil
}

	foundFree := func(addr offAddr, size uintptr) {
		if firstFree.base.lessEqual(addr) && addr.add(size-1).lessEqual(firstFree.bound) {
			// This range fits within the current firstFree window, so narrow
			// down the firstFree window to the base and bound of this range.
			firstFree.base = addr
			firstFree.bound = addr.add(size - 1)

	}

	return d, nil
}

// lookup finds the symbol name containing addr.
func (d *Disasm) lookup(addr uint64) (name string, base uint64) {
	i := sort.Search(len(d.syms), func(i int) bool { return addr < d.syms[i].Addr })
	if i > 0 {
		s := d.syms[i-1]
		if s.Addr != 0 && s.Addr <= addr && addr < s.Addr+uint64(s.Size) {
			return s.Name, s.Addr
		}
	}
	return "", 0
}

	// all 65535 valid (fake) ports. The listener is already using one, so
	// we should be able to Dial the remaining 65534.
	for len(dialed) < (1<<16)-2 {
		c, err := Dial(ln.Addr().Network(), ln.Addr().String())
		if err != nil {
			t.Fatalf("unexpected error from Dial with %v connections: %v", len(dialed), err)
		}
		dialed = append(dialed, c)
		if testing.Verbose() && len(dialed)%(1<<12) == 0 {