diff --git a/src/pkg/net/fd_windows.go b/src/pkg/net/fd_windows.go
--- a/src/pkg/net/fd_windows.go
+++ b/src/pkg/net/fd_windows.go
@@ -27,7 +27,42 @@
 // package uses CancelIoEx API, if present, otherwise it fallback
 // to CancelIo.
 
-var canCancelIO bool // determines if CancelIoEx API is present
+var (
+	canCancelIO                               bool // determines if CancelIoEx API is present
+	skipSyncNotif                             bool
+	hasLoadSetFileCompletionNotificationModes bool
+)
+
+func loadProtoInfo() ([]syscall.WSAProtocolInfo, error) {
+	protos := [2]int32{syscall.IPPROTO_TCP, 0}
+	var l uint32
+	_, err := syscall.WSAEnumProtocols(&protos[0], nil, &l)
+	if err != syscall.WSAENOBUFS {
+		return nil, errors.New("WSAEnumProtocols should return WSAENOBUFS")
+	}
+	buf := make([]byte, l)
+	p := (*[1 << 20]syscall.WSAProtocolInfo)(unsafe.Pointer(&buf[0]))[:]
+	n, err := syscall.WSAEnumProtocols(&protos[0], &p[0], &l)
+	if err != nil {
+		return nil, err
+	}
+	return p[:n], err
+}
+
+func isNonIFSLSPInstalled() bool {
+	// It's not safe to use FILE_SKIP_COMPLETION_PORT_ON_SUCCESS if non IFS providers are installed:
+	// http://support.microsoft.com/kb/2568167
+	pi, err := loadProtoInfo()
+	if err != nil {
+		return false
+	}
+	for _, i := range pi {
+		if i.ServiceFlags1&syscall.XP1_IFS_HANDLES == 0 {
+			return false
+		}
+	}
+	return true
+}
 
 func sysInit() {
 	var d syscall.WSAData
@@ -40,6 +75,10 @@
 		lookupPort = newLookupPort
 		lookupIP = newLookupIP
 	}
+	hasLoadSetFileCompletionNotificationModes = syscall.LoadSetFileCompletionNotificationModes() == nil
+	if hasLoadSetFileCompletionNotificationModes {
+		skipSyncNotif = isNonIFSLSPInstalled()
+	}
 }
 
 func closesocket(s syscall.Handle) error {
@@ -148,7 +187,12 @@
 	}
 	switch err {
 	case nil:
-		// IO completed immediately, but we need to get our completion message anyway.
+		// IO completed immediately
+		if o.fd.skipSyncNotif {
+			// No completion message will follow, so return immediately.
+			return int(o.qty), nil
+		}
+		// Need to get our completion message anyway.
 	case syscall.ERROR_IO_PENDING:
 		// IO started, and we have to wait for its completion.
 		err = nil
@@ -222,13 +266,14 @@
 	closing bool
 
 	// immutable until Close
-	sysfd       syscall.Handle
-	family      int
-	sotype      int
-	isConnected bool
-	net         string
-	laddr       Addr
-	raddr       Addr
+	sysfd         syscall.Handle
+	family        int
+	sotype        int
+	isConnected   bool
+	skipSyncNotif bool
+	net           string
+	laddr         Addr
+	raddr         Addr
 
 	rop operation // read operation
 	wop operation // write operation
@@ -249,6 +294,19 @@
 	if err := fd.pd.Init(fd); err != nil {
 		return err
 	}
+	if hasLoadSetFileCompletionNotificationModes {
+		// We do not use events, so we can skip them always.
+		flags := uint8(syscall.FILE_SKIP_SET_EVENT_ON_HANDLE)
+		// It's not safe to skip completion notifications for UDP:
+		// http://blogs.technet.com/b/winserverperformance/archive/2008/06/26/designing-applications-for-high-performance-part-iii.aspx
+		if skipSyncNotif && fd.net == "tcp" {
+			flags |= syscall.FILE_SKIP_COMPLETION_PORT_ON_SUCCESS
+		}
+		err := syscall.SetFileCompletionNotificationModes(fd.sysfd, flags)
+		if err == nil && flags&syscall.FILE_SKIP_COMPLETION_PORT_ON_SUCCESS != 0 {
+			fd.skipSyncNotif = true
+		}
+	}
 	fd.rop.mode = 'r'
 	fd.wop.mode = 'w'
 	fd.rop.fd = fd
diff --git a/src/pkg/syscall/syscall_windows.go b/src/pkg/syscall/syscall_windows.go
--- a/src/pkg/syscall/syscall_windows.go
+++ b/src/pkg/syscall/syscall_windows.go
@@ -508,6 +508,10 @@
 	return procCancelIoEx.Find()
 }
 
+func LoadSetFileCompletionNotificationModes() error {
+	return procSetFileCompletionNotificationModes.Find()
+}
+
 // net api calls
 
 const socket_error = uintptr(^uint32(0))
@@ -541,6 +545,8 @@
 //sys	FreeAddrInfoW(addrinfo *AddrinfoW) = ws2_32.FreeAddrInfoW
 //sys	GetIfEntry(pIfRow *MibIfRow) (errcode error) = iphlpapi.GetIfEntry
 //sys	GetAdaptersInfo(ai *IpAdapterInfo, ol *uint32) (errcode error) = iphlpapi.GetAdaptersInfo
+//sys	SetFileCompletionNotificationModes(handle Handle, flags uint8) (err error) = kernel32.SetFileCompletionNotificationModes
+//sys	WSAEnumProtocols(protocols *int32, protocolBuffer *WSAProtocolInfo, bufferLength *uint32) (n uintptr, err error) [failretval==socket_error] = ws2_32.WSAEnumProtocolsW
 
 // For testing: clients can set this flag to force
 // creation of IPv6 sockets to return EAFNOSUPPORT.
diff --git a/src/pkg/syscall/zsyscall_windows_386.go b/src/pkg/syscall/zsyscall_windows_386.go
--- a/src/pkg/syscall/zsyscall_windows_386.go
+++ b/src/pkg/syscall/zsyscall_windows_386.go
@@ -18,139 +18,141 @@
 	modnetapi32 = NewLazyDLL("netapi32.dll")
 	moduserenv  = NewLazyDLL("userenv.dll")
 
-	procGetLastError                     = modkernel32.NewProc("GetLastError")
-	procLoadLibraryW                     = modkernel32.NewProc("LoadLibraryW")
-	procFreeLibrary                      = modkernel32.NewProc("FreeLibrary")
-	procGetProcAddress                   = modkernel32.NewProc("GetProcAddress")
-	procGetVersion                       = modkernel32.NewProc("GetVersion")
-	procFormatMessageW                   = modkernel32.NewProc("FormatMessageW")
-	procExitProcess                      = modkernel32.NewProc("ExitProcess")
-	procCreateFileW                      = modkernel32.NewProc("CreateFileW")
-	procReadFile                         = modkernel32.NewProc("ReadFile")
-	procWriteFile                        = modkernel32.NewProc("WriteFile")
-	procSetFilePointer                   = modkernel32.NewProc("SetFilePointer")
-	procCloseHandle                      = modkernel32.NewProc("CloseHandle")
-	procGetStdHandle                     = modkernel32.NewProc("GetStdHandle")
-	procFindFirstFileW                   = modkernel32.NewProc("FindFirstFileW")
-	procFindNextFileW                    = modkernel32.NewProc("FindNextFileW")
-	procFindClose                        = modkernel32.NewProc("FindClose")
-	procGetFileInformationByHandle       = modkernel32.NewProc("GetFileInformationByHandle")
-	procGetCurrentDirectoryW             = modkernel32.NewProc("GetCurrentDirectoryW")
-	procSetCurrentDirectoryW             = modkernel32.NewProc("SetCurrentDirectoryW")
-	procCreateDirectoryW                 = modkernel32.NewProc("CreateDirectoryW")
-	procRemoveDirectoryW                 = modkernel32.NewProc("RemoveDirectoryW")
-	procDeleteFileW                      = modkernel32.NewProc("DeleteFileW")
-	procMoveFileW                        = modkernel32.NewProc("MoveFileW")
-	procGetComputerNameW                 = modkernel32.NewProc("GetComputerNameW")
-	procSetEndOfFile                     = modkernel32.NewProc("SetEndOfFile")
-	procGetSystemTimeAsFileTime          = modkernel32.NewProc("GetSystemTimeAsFileTime")
-	procGetTimeZoneInformation           = modkernel32.NewProc("GetTimeZoneInformation")
-	procCreateIoCompletionPort           = modkernel32.NewProc("CreateIoCompletionPort")
-	procGetQueuedCompletionStatus        = modkernel32.NewProc("GetQueuedCompletionStatus")
-	procPostQueuedCompletionStatus       = modkernel32.NewProc("PostQueuedCompletionStatus")
-	procCancelIo                         = modkernel32.NewProc("CancelIo")
-	procCancelIoEx                       = modkernel32.NewProc("CancelIoEx")
-	procCreateProcessW                   = modkernel32.NewProc("CreateProcessW")
-	procOpenProcess                      = modkernel32.NewProc("OpenProcess")
-	procTerminateProcess                 = modkernel32.NewProc("TerminateProcess")
-	procGetExitCodeProcess               = modkernel32.NewProc("GetExitCodeProcess")
-	procGetStartupInfoW                  = modkernel32.NewProc("GetStartupInfoW")
-	procGetCurrentProcess                = modkernel32.NewProc("GetCurrentProcess")
-	procGetProcessTimes                  = modkernel32.NewProc("GetProcessTimes")
-	procDuplicateHandle                  = modkernel32.NewProc("DuplicateHandle")
-	procWaitForSingleObject              = modkernel32.NewProc("WaitForSingleObject")
-	procGetTempPathW                     = modkernel32.NewProc("GetTempPathW")
-	procCreatePipe                       = modkernel32.NewProc("CreatePipe")
-	procGetFileType                      = modkernel32.NewProc("GetFileType")
-	procCryptAcquireContextW             = modadvapi32.NewProc("CryptAcquireContextW")
-	procCryptReleaseContext              = modadvapi32.NewProc("CryptReleaseContext")
-	procCryptGenRandom                   = modadvapi32.NewProc("CryptGenRandom")
-	procGetEnvironmentStringsW           = modkernel32.NewProc("GetEnvironmentStringsW")
-	procFreeEnvironmentStringsW          = modkernel32.NewProc("FreeEnvironmentStringsW")
-	procGetEnvironmentVariableW          = modkernel32.NewProc("GetEnvironmentVariableW")
-	procSetEnvironmentVariableW          = modkernel32.NewProc("SetEnvironmentVariableW")
-	procSetFileTime                      = modkernel32.NewProc("SetFileTime")
-	procGetFileAttributesW               = modkernel32.NewProc("GetFileAttributesW")
-	procSetFileAttributesW               = modkernel32.NewProc("SetFileAttributesW")
-	procGetFileAttributesExW             = modkernel32.NewProc("GetFileAttributesExW")
-	procGetCommandLineW                  = modkernel32.NewProc("GetCommandLineW")
-	procCommandLineToArgvW               = modshell32.NewProc("CommandLineToArgvW")
-	procLocalFree                        = modkernel32.NewProc("LocalFree")
-	procSetHandleInformation             = modkernel32.NewProc("SetHandleInformation")
-	procFlushFileBuffers                 = modkernel32.NewProc("FlushFileBuffers")
-	procGetFullPathNameW                 = modkernel32.NewProc("GetFullPathNameW")
-	procGetLongPathNameW                 = modkernel32.NewProc("GetLongPathNameW")
-	procGetShortPathNameW                = modkernel32.NewProc("GetShortPathNameW")
-	procCreateFileMappingW               = modkernel32.NewProc("CreateFileMappingW")
-	procMapViewOfFile                    = modkernel32.NewProc("MapViewOfFile")
-	procUnmapViewOfFile                  = modkernel32.NewProc("UnmapViewOfFile")
-	procFlushViewOfFile                  = modkernel32.NewProc("FlushViewOfFile")
-	procVirtualLock                      = modkernel32.NewProc("VirtualLock")
-	procVirtualUnlock                    = modkernel32.NewProc("VirtualUnlock")
-	procTransmitFile                     = modmswsock.NewProc("TransmitFile")
-	procReadDirectoryChangesW            = modkernel32.NewProc("ReadDirectoryChangesW")
-	procCertOpenSystemStoreW             = modcrypt32.NewProc("CertOpenSystemStoreW")
-	procCertOpenStore                    = modcrypt32.NewProc("CertOpenStore")
-	procCertEnumCertificatesInStore      = modcrypt32.NewProc("CertEnumCertificatesInStore")
-	procCertAddCertificateContextToStore = modcrypt32.NewProc("CertAddCertificateContextToStore")
-	procCertCloseStore                   = modcrypt32.NewProc("CertCloseStore")
-	procCertGetCertificateChain          = modcrypt32.NewProc("CertGetCertificateChain")
-	procCertFreeCertificateChain         = modcrypt32.NewProc("CertFreeCertificateChain")
-	procCertCreateCertificateContext     = modcrypt32.NewProc("CertCreateCertificateContext")
-	procCertFreeCertificateContext       = modcrypt32.NewProc("CertFreeCertificateContext")
-	procCertVerifyCertificateChainPolicy = modcrypt32.NewProc("CertVerifyCertificateChainPolicy")
-	procRegOpenKeyExW                    = modadvapi32.NewProc("RegOpenKeyExW")
-	procRegCloseKey                      = modadvapi32.NewProc("RegCloseKey")
-	procRegQueryInfoKeyW                 = modadvapi32.NewProc("RegQueryInfoKeyW")
-	procRegEnumKeyExW                    = modadvapi32.NewProc("RegEnumKeyExW")
-	procRegQueryValueExW                 = modadvapi32.NewProc("RegQueryValueExW")
-	procGetCurrentProcessId              = modkernel32.NewProc("GetCurrentProcessId")
-	procGetConsoleMode                   = modkernel32.NewProc("GetConsoleMode")
-	procWriteConsoleW                    = modkernel32.NewProc("WriteConsoleW")
-	procReadConsoleW                     = modkernel32.NewProc("ReadConsoleW")
-	procWSAStartup                       = modws2_32.NewProc("WSAStartup")
-	procWSACleanup                       = modws2_32.NewProc("WSACleanup")
-	procWSAIoctl                         = modws2_32.NewProc("WSAIoctl")
-	procsocket                           = modws2_32.NewProc("socket")
-	procsetsockopt                       = modws2_32.NewProc("setsockopt")
-	procgetsockopt                       = modws2_32.NewProc("getsockopt")
-	procbind                             = modws2_32.NewProc("bind")
-	procconnect                          = modws2_32.NewProc("connect")
-	procgetsockname                      = modws2_32.NewProc("getsockname")
-	procgetpeername                      = modws2_32.NewProc("getpeername")
-	proclisten                           = modws2_32.NewProc("listen")
-	procshutdown                         = modws2_32.NewProc("shutdown")
-	procclosesocket                      = modws2_32.NewProc("closesocket")
-	procAcceptEx                         = modmswsock.NewProc("AcceptEx")
-	procGetAcceptExSockaddrs             = modmswsock.NewProc("GetAcceptExSockaddrs")
-	procWSARecv                          = modws2_32.NewProc("WSARecv")
-	procWSASend                          = modws2_32.NewProc("WSASend")
-	procWSARecvFrom                      = modws2_32.NewProc("WSARecvFrom")
-	procWSASendTo                        = modws2_32.NewProc("WSASendTo")
-	procgethostbyname                    = modws2_32.NewProc("gethostbyname")
-	procgetservbyname                    = modws2_32.NewProc("getservbyname")
-	procntohs                            = modws2_32.NewProc("ntohs")
-	procgetprotobyname                   = modws2_32.NewProc("getprotobyname")
-	procDnsQuery_W                       = moddnsapi.NewProc("DnsQuery_W")
-	procDnsRecordListFree                = moddnsapi.NewProc("DnsRecordListFree")
-	procGetAddrInfoW                     = modws2_32.NewProc("GetAddrInfoW")
-	procFreeAddrInfoW                    = modws2_32.NewProc("FreeAddrInfoW")
-	procGetIfEntry                       = modiphlpapi.NewProc("GetIfEntry")
-	procGetAdaptersInfo                  = modiphlpapi.NewProc("GetAdaptersInfo")
-	procTranslateNameW                   = modsecur32.NewProc("TranslateNameW")
-	procGetUserNameExW                   = modsecur32.NewProc("GetUserNameExW")
-	procNetUserGetInfo                   = modnetapi32.NewProc("NetUserGetInfo")
-	procNetGetJoinInformation            = modnetapi32.NewProc("NetGetJoinInformation")
-	procNetApiBufferFree                 = modnetapi32.NewProc("NetApiBufferFree")
-	procLookupAccountSidW                = modadvapi32.NewProc("LookupAccountSidW")
-	procLookupAccountNameW               = modadvapi32.NewProc("LookupAccountNameW")
-	procConvertSidToStringSidW           = modadvapi32.NewProc("ConvertSidToStringSidW")
-	procConvertStringSidToSidW           = modadvapi32.NewProc("ConvertStringSidToSidW")
-	procGetLengthSid                     = modadvapi32.NewProc("GetLengthSid")
-	procCopySid                          = modadvapi32.NewProc("CopySid")
-	procOpenProcessToken                 = modadvapi32.NewProc("OpenProcessToken")
-	procGetTokenInformation              = modadvapi32.NewProc("GetTokenInformation")
-	procGetUserProfileDirectoryW         = moduserenv.NewProc("GetUserProfileDirectoryW")
+	procGetLastError                       = modkernel32.NewProc("GetLastError")
+	procLoadLibraryW                       = modkernel32.NewProc("LoadLibraryW")
+	procFreeLibrary                        = modkernel32.NewProc("FreeLibrary")
+	procGetProcAddress                     = modkernel32.NewProc("GetProcAddress")
+	procGetVersion                         = modkernel32.NewProc("GetVersion")
+	procFormatMessageW                     = modkernel32.NewProc("FormatMessageW")
+	procExitProcess                        = modkernel32.NewProc("ExitProcess")
+	procCreateFileW                        = modkernel32.NewProc("CreateFileW")
+	procReadFile                           = modkernel32.NewProc("ReadFile")
+	procWriteFile                          = modkernel32.NewProc("WriteFile")
+	procSetFilePointer                     = modkernel32.NewProc("SetFilePointer")
+	procCloseHandle                        = modkernel32.NewProc("CloseHandle")
+	procGetStdHandle                       = modkernel32.NewProc("GetStdHandle")
+	procFindFirstFileW                     = modkernel32.NewProc("FindFirstFileW")
+	procFindNextFileW                      = modkernel32.NewProc("FindNextFileW")
+	procFindClose                          = modkernel32.NewProc("FindClose")
+	procGetFileInformationByHandle         = modkernel32.NewProc("GetFileInformationByHandle")
+	procGetCurrentDirectoryW               = modkernel32.NewProc("GetCurrentDirectoryW")
+	procSetCurrentDirectoryW               = modkernel32.NewProc("SetCurrentDirectoryW")
+	procCreateDirectoryW                   = modkernel32.NewProc("CreateDirectoryW")
+	procRemoveDirectoryW                   = modkernel32.NewProc("RemoveDirectoryW")
+	procDeleteFileW                        = modkernel32.NewProc("DeleteFileW")
+	procMoveFileW                          = modkernel32.NewProc("MoveFileW")
+	procGetComputerNameW                   = modkernel32.NewProc("GetComputerNameW")
+	procSetEndOfFile                       = modkernel32.NewProc("SetEndOfFile")
+	procGetSystemTimeAsFileTime            = modkernel32.NewProc("GetSystemTimeAsFileTime")
+	procGetTimeZoneInformation             = modkernel32.NewProc("GetTimeZoneInformation")
+	procCreateIoCompletionPort             = modkernel32.NewProc("CreateIoCompletionPort")
+	procGetQueuedCompletionStatus          = modkernel32.NewProc("GetQueuedCompletionStatus")
+	procPostQueuedCompletionStatus         = modkernel32.NewProc("PostQueuedCompletionStatus")
+	procCancelIo                           = modkernel32.NewProc("CancelIo")
+	procCancelIoEx                         = modkernel32.NewProc("CancelIoEx")
+	procCreateProcessW                     = modkernel32.NewProc("CreateProcessW")
+	procOpenProcess                        = modkernel32.NewProc("OpenProcess")
+	procTerminateProcess                   = modkernel32.NewProc("TerminateProcess")
+	procGetExitCodeProcess                 = modkernel32.NewProc("GetExitCodeProcess")
+	procGetStartupInfoW                    = modkernel32.NewProc("GetStartupInfoW")
+	procGetCurrentProcess                  = modkernel32.NewProc("GetCurrentProcess")
+	procGetProcessTimes                    = modkernel32.NewProc("GetProcessTimes")
+	procDuplicateHandle                    = modkernel32.NewProc("DuplicateHandle")
+	procWaitForSingleObject                = modkernel32.NewProc("WaitForSingleObject")
+	procGetTempPathW                       = modkernel32.NewProc("GetTempPathW")
+	procCreatePipe                         = modkernel32.NewProc("CreatePipe")
+	procGetFileType                        = modkernel32.NewProc("GetFileType")
+	procCryptAcquireContextW               = modadvapi32.NewProc("CryptAcquireContextW")
+	procCryptReleaseContext                = modadvapi32.NewProc("CryptReleaseContext")
+	procCryptGenRandom                     = modadvapi32.NewProc("CryptGenRandom")
+	procGetEnvironmentStringsW             = modkernel32.NewProc("GetEnvironmentStringsW")
+	procFreeEnvironmentStringsW            = modkernel32.NewProc("FreeEnvironmentStringsW")
+	procGetEnvironmentVariableW            = modkernel32.NewProc("GetEnvironmentVariableW")
+	procSetEnvironmentVariableW            = modkernel32.NewProc("SetEnvironmentVariableW")
+	procSetFileTime                        = modkernel32.NewProc("SetFileTime")
+	procGetFileAttributesW                 = modkernel32.NewProc("GetFileAttributesW")
+	procSetFileAttributesW                 = modkernel32.NewProc("SetFileAttributesW")
+	procGetFileAttributesExW               = modkernel32.NewProc("GetFileAttributesExW")
+	procGetCommandLineW                    = modkernel32.NewProc("GetCommandLineW")
+	procCommandLineToArgvW                 = modshell32.NewProc("CommandLineToArgvW")
+	procLocalFree                          = modkernel32.NewProc("LocalFree")
+	procSetHandleInformation               = modkernel32.NewProc("SetHandleInformation")
+	procFlushFileBuffers                   = modkernel32.NewProc("FlushFileBuffers")
+	procGetFullPathNameW                   = modkernel32.NewProc("GetFullPathNameW")
+	procGetLongPathNameW                   = modkernel32.NewProc("GetLongPathNameW")
+	procGetShortPathNameW                  = modkernel32.NewProc("GetShortPathNameW")
+	procCreateFileMappingW                 = modkernel32.NewProc("CreateFileMappingW")
+	procMapViewOfFile                      = modkernel32.NewProc("MapViewOfFile")
+	procUnmapViewOfFile                    = modkernel32.NewProc("UnmapViewOfFile")
+	procFlushViewOfFile                    = modkernel32.NewProc("FlushViewOfFile")
+	procVirtualLock                        = modkernel32.NewProc("VirtualLock")
+	procVirtualUnlock                      = modkernel32.NewProc("VirtualUnlock")
+	procTransmitFile                       = modmswsock.NewProc("TransmitFile")
+	procReadDirectoryChangesW              = modkernel32.NewProc("ReadDirectoryChangesW")
+	procCertOpenSystemStoreW               = modcrypt32.NewProc("CertOpenSystemStoreW")
+	procCertOpenStore                      = modcrypt32.NewProc("CertOpenStore")
+	procCertEnumCertificatesInStore        = modcrypt32.NewProc("CertEnumCertificatesInStore")
+	procCertAddCertificateContextToStore   = modcrypt32.NewProc("CertAddCertificateContextToStore")
+	procCertCloseStore                     = modcrypt32.NewProc("CertCloseStore")
+	procCertGetCertificateChain            = modcrypt32.NewProc("CertGetCertificateChain")
+	procCertFreeCertificateChain           = modcrypt32.NewProc("CertFreeCertificateChain")
+	procCertCreateCertificateContext       = modcrypt32.NewProc("CertCreateCertificateContext")
+	procCertFreeCertificateContext         = modcrypt32.NewProc("CertFreeCertificateContext")
+	procCertVerifyCertificateChainPolicy   = modcrypt32.NewProc("CertVerifyCertificateChainPolicy")
+	procRegOpenKeyExW                      = modadvapi32.NewProc("RegOpenKeyExW")
+	procRegCloseKey                        = modadvapi32.NewProc("RegCloseKey")
+	procRegQueryInfoKeyW                   = modadvapi32.NewProc("RegQueryInfoKeyW")
+	procRegEnumKeyExW                      = modadvapi32.NewProc("RegEnumKeyExW")
+	procRegQueryValueExW                   = modadvapi32.NewProc("RegQueryValueExW")
+	procGetCurrentProcessId                = modkernel32.NewProc("GetCurrentProcessId")
+	procGetConsoleMode                     = modkernel32.NewProc("GetConsoleMode")
+	procWriteConsoleW                      = modkernel32.NewProc("WriteConsoleW")
+	procReadConsoleW                       = modkernel32.NewProc("ReadConsoleW")
+	procWSAStartup                         = modws2_32.NewProc("WSAStartup")
+	procWSACleanup                         = modws2_32.NewProc("WSACleanup")
+	procWSAIoctl                           = modws2_32.NewProc("WSAIoctl")
+	procsocket                             = modws2_32.NewProc("socket")
+	procsetsockopt                         = modws2_32.NewProc("setsockopt")
+	procgetsockopt                         = modws2_32.NewProc("getsockopt")
+	procbind                               = modws2_32.NewProc("bind")
+	procconnect                            = modws2_32.NewProc("connect")
+	procgetsockname                        = modws2_32.NewProc("getsockname")
+	procgetpeername                        = modws2_32.NewProc("getpeername")
+	proclisten                             = modws2_32.NewProc("listen")
+	procshutdown                           = modws2_32.NewProc("shutdown")
+	procclosesocket                        = modws2_32.NewProc("closesocket")
+	procAcceptEx                           = modmswsock.NewProc("AcceptEx")
+	procGetAcceptExSockaddrs               = modmswsock.NewProc("GetAcceptExSockaddrs")
+	procWSARecv                            = modws2_32.NewProc("WSARecv")
+	procWSASend                            = modws2_32.NewProc("WSASend")
+	procWSARecvFrom                        = modws2_32.NewProc("WSARecvFrom")
+	procWSASendTo                          = modws2_32.NewProc("WSASendTo")
+	procgethostbyname                      = modws2_32.NewProc("gethostbyname")
+	procgetservbyname                      = modws2_32.NewProc("getservbyname")
+	procntohs                              = modws2_32.NewProc("ntohs")
+	procgetprotobyname                     = modws2_32.NewProc("getprotobyname")
+	procDnsQuery_W                         = moddnsapi.NewProc("DnsQuery_W")
+	procDnsRecordListFree                  = moddnsapi.NewProc("DnsRecordListFree")
+	procGetAddrInfoW                       = modws2_32.NewProc("GetAddrInfoW")
+	procFreeAddrInfoW                      = modws2_32.NewProc("FreeAddrInfoW")
+	procGetIfEntry                         = modiphlpapi.NewProc("GetIfEntry")
+	procGetAdaptersInfo                    = modiphlpapi.NewProc("GetAdaptersInfo")
+	procSetFileCompletionNotificationModes = modkernel32.NewProc("SetFileCompletionNotificationModes")
+	procWSAEnumProtocolsW                  = modws2_32.NewProc("WSAEnumProtocolsW")
+	procTranslateNameW                     = modsecur32.NewProc("TranslateNameW")
+	procGetUserNameExW                     = modsecur32.NewProc("GetUserNameExW")
+	procNetUserGetInfo                     = modnetapi32.NewProc("NetUserGetInfo")
+	procNetGetJoinInformation              = modnetapi32.NewProc("NetGetJoinInformation")
+	procNetApiBufferFree                   = modnetapi32.NewProc("NetApiBufferFree")
+	procLookupAccountSidW                  = modadvapi32.NewProc("LookupAccountSidW")
+	procLookupAccountNameW                 = modadvapi32.NewProc("LookupAccountNameW")
+	procConvertSidToStringSidW             = modadvapi32.NewProc("ConvertSidToStringSidW")
+	procConvertStringSidToSidW             = modadvapi32.NewProc("ConvertStringSidToSidW")
+	procGetLengthSid                       = modadvapi32.NewProc("GetLengthSid")
+	procCopySid                            = modadvapi32.NewProc("CopySid")
+	procOpenProcessToken                   = modadvapi32.NewProc("OpenProcessToken")
+	procGetTokenInformation                = modadvapi32.NewProc("GetTokenInformation")
+	procGetUserProfileDirectoryW           = moduserenv.NewProc("GetUserProfileDirectoryW")
 )
 
 func GetLastError() (lasterr error) {
@@ -1582,6 +1584,31 @@
 	return
 }
 
+func SetFileCompletionNotificationModes(handle Handle, flags uint8) (err error) {
+	r1, _, e1 := Syscall(procSetFileCompletionNotificationModes.Addr(), 2, uintptr(handle), uintptr(flags), 0)
+	if r1 == 0 {
+		if e1 != 0 {
+			err = error(e1)
+		} else {
+			err = EINVAL
+		}
+	}
+	return
+}
+
+func WSAEnumProtocols(protocols *int32, protocolBuffer *WSAProtocolInfo, bufferLength *uint32) (n uintptr, err error) {
+	r0, _, e1 := Syscall(procWSAEnumProtocolsW.Addr(), 3, uintptr(unsafe.Pointer(protocols)), uintptr(unsafe.Pointer(protocolBuffer)), uintptr(unsafe.Pointer(bufferLength)))
+	n = uintptr(r0)
+	if n == socket_error {
+		if e1 != 0 {
+			err = error(e1)
+		} else {
+			err = EINVAL
+		}
+	}
+	return
+}
+
 func TranslateName(accName *uint16, accNameFormat uint32, desiredNameFormat uint32, translatedName *uint16, nSize *uint32) (err error) {
 	r1, _, e1 := Syscall6(procTranslateNameW.Addr(), 5, uintptr(unsafe.Pointer(accName)), uintptr(accNameFormat), uintptr(desiredNameFormat), uintptr(unsafe.Pointer(translatedName)), uintptr(unsafe.Pointer(nSize)), 0)
 	if r1&0xff == 0 {
diff --git a/src/pkg/syscall/zsyscall_windows_amd64.go b/src/pkg/syscall/zsyscall_windows_amd64.go
--- a/src/pkg/syscall/zsyscall_windows_amd64.go
+++ b/src/pkg/syscall/zsyscall_windows_amd64.go
@@ -18,139 +18,141 @@
 	modnetapi32 = NewLazyDLL("netapi32.dll")
 	moduserenv  = NewLazyDLL("userenv.dll")
 
-	procGetLastError                     = modkernel32.NewProc("GetLastError")
-	procLoadLibraryW                     = modkernel32.NewProc("LoadLibraryW")
-	procFreeLibrary                      = modkernel32.NewProc("FreeLibrary")
-	procGetProcAddress                   = modkernel32.NewProc("GetProcAddress")
-	procGetVersion                       = modkernel32.NewProc("GetVersion")
-	procFormatMessageW                   = modkernel32.NewProc("FormatMessageW")
-	procExitProcess                      = modkernel32.NewProc("ExitProcess")
-	procCreateFileW                      = modkernel32.NewProc("CreateFileW")
-	procReadFile                         = modkernel32.NewProc("ReadFile")
-	procWriteFile                        = modkernel32.NewProc("WriteFile")
-	procSetFilePointer                   = modkernel32.NewProc("SetFilePointer")
-	procCloseHandle                      = modkernel32.NewProc("CloseHandle")
-	procGetStdHandle                     = modkernel32.NewProc("GetStdHandle")
-	procFindFirstFileW                   = modkernel32.NewProc("FindFirstFileW")
-	procFindNextFileW                    = modkernel32.NewProc("FindNextFileW")
-	procFindClose                        = modkernel32.NewProc("FindClose")
-	procGetFileInformationByHandle       = modkernel32.NewProc("GetFileInformationByHandle")
-	procGetCurrentDirectoryW             = modkernel32.NewProc("GetCurrentDirectoryW")
-	procSetCurrentDirectoryW             = modkernel32.NewProc("SetCurrentDirectoryW")
-	procCreateDirectoryW                 = modkernel32.NewProc("CreateDirectoryW")
-	procRemoveDirectoryW                 = modkernel32.NewProc("RemoveDirectoryW")
-	procDeleteFileW                      = modkernel32.NewProc("DeleteFileW")
-	procMoveFileW                        = modkernel32.NewProc("MoveFileW")
-	procGetComputerNameW                 = modkernel32.NewProc("GetComputerNameW")
-	procSetEndOfFile                     = modkernel32.NewProc("SetEndOfFile")
-	procGetSystemTimeAsFileTime          = modkernel32.NewProc("GetSystemTimeAsFileTime")
-	procGetTimeZoneInformation           = modkernel32.NewProc("GetTimeZoneInformation")
-	procCreateIoCompletionPort           = modkernel32.NewProc("CreateIoCompletionPort")
-	procGetQueuedCompletionStatus        = modkernel32.NewProc("GetQueuedCompletionStatus")
-	procPostQueuedCompletionStatus       = modkernel32.NewProc("PostQueuedCompletionStatus")
-	procCancelIo                         = modkernel32.NewProc("CancelIo")
-	procCancelIoEx                       = modkernel32.NewProc("CancelIoEx")
-	procCreateProcessW                   = modkernel32.NewProc("CreateProcessW")
-	procOpenProcess                      = modkernel32.NewProc("OpenProcess")
-	procTerminateProcess                 = modkernel32.NewProc("TerminateProcess")
-	procGetExitCodeProcess               = modkernel32.NewProc("GetExitCodeProcess")
-	procGetStartupInfoW                  = modkernel32.NewProc("GetStartupInfoW")
-	procGetCurrentProcess                = modkernel32.NewProc("GetCurrentProcess")
-	procGetProcessTimes                  = modkernel32.NewProc("GetProcessTimes")
-	procDuplicateHandle                  = modkernel32.NewProc("DuplicateHandle")
-	procWaitForSingleObject              = modkernel32.NewProc("WaitForSingleObject")
-	procGetTempPathW                     = modkernel32.NewProc("GetTempPathW")
-	procCreatePipe                       = modkernel32.NewProc("CreatePipe")
-	procGetFileType                      = modkernel32.NewProc("GetFileType")
-	procCryptAcquireContextW             = modadvapi32.NewProc("CryptAcquireContextW")
-	procCryptReleaseContext              = modadvapi32.NewProc("CryptReleaseContext")
-	procCryptGenRandom                   = modadvapi32.NewProc("CryptGenRandom")
-	procGetEnvironmentStringsW           = modkernel32.NewProc("GetEnvironmentStringsW")
-	procFreeEnvironmentStringsW          = modkernel32.NewProc("FreeEnvironmentStringsW")
-	procGetEnvironmentVariableW          = modkernel32.NewProc("GetEnvironmentVariableW")
-	procSetEnvironmentVariableW          = modkernel32.NewProc("SetEnvironmentVariableW")
-	procSetFileTime                      = modkernel32.NewProc("SetFileTime")
-	procGetFileAttributesW               = modkernel32.NewProc("GetFileAttributesW")
-	procSetFileAttributesW               = modkernel32.NewProc("SetFileAttributesW")
-	procGetFileAttributesExW             = modkernel32.NewProc("GetFileAttributesExW")
-	procGetCommandLineW                  = modkernel32.NewProc("GetCommandLineW")
-	procCommandLineToArgvW               = modshell32.NewProc("CommandLineToArgvW")
-	procLocalFree                        = modkernel32.NewProc("LocalFree")
-	procSetHandleInformation             = modkernel32.NewProc("SetHandleInformation")
-	procFlushFileBuffers                 = modkernel32.NewProc("FlushFileBuffers")
-	procGetFullPathNameW                 = modkernel32.NewProc("GetFullPathNameW")
-	procGetLongPathNameW                 = modkernel32.NewProc("GetLongPathNameW")
-	procGetShortPathNameW                = modkernel32.NewProc("GetShortPathNameW")
-	procCreateFileMappingW               = modkernel32.NewProc("CreateFileMappingW")
-	procMapViewOfFile                    = modkernel32.NewProc("MapViewOfFile")
-	procUnmapViewOfFile                  = modkernel32.NewProc("UnmapViewOfFile")
-	procFlushViewOfFile                  = modkernel32.NewProc("FlushViewOfFile")
-	procVirtualLock                      = modkernel32.NewProc("VirtualLock")
-	procVirtualUnlock                    = modkernel32.NewProc("VirtualUnlock")
-	procTransmitFile                     = modmswsock.NewProc("TransmitFile")
-	procReadDirectoryChangesW            = modkernel32.NewProc("ReadDirectoryChangesW")
-	procCertOpenSystemStoreW             = modcrypt32.NewProc("CertOpenSystemStoreW")
-	procCertOpenStore                    = modcrypt32.NewProc("CertOpenStore")
-	procCertEnumCertificatesInStore      = modcrypt32.NewProc("CertEnumCertificatesInStore")
-	procCertAddCertificateContextToStore = modcrypt32.NewProc("CertAddCertificateContextToStore")
-	procCertCloseStore                   = modcrypt32.NewProc("CertCloseStore")
-	procCertGetCertificateChain          = modcrypt32.NewProc("CertGetCertificateChain")
-	procCertFreeCertificateChain         = modcrypt32.NewProc("CertFreeCertificateChain")
-	procCertCreateCertificateContext     = modcrypt32.NewProc("CertCreateCertificateContext")
-	procCertFreeCertificateContext       = modcrypt32.NewProc("CertFreeCertificateContext")
-	procCertVerifyCertificateChainPolicy = modcrypt32.NewProc("CertVerifyCertificateChainPolicy")
-	procRegOpenKeyExW                    = modadvapi32.NewProc("RegOpenKeyExW")
-	procRegCloseKey                      = modadvapi32.NewProc("RegCloseKey")
-	procRegQueryInfoKeyW                 = modadvapi32.NewProc("RegQueryInfoKeyW")
-	procRegEnumKeyExW                    = modadvapi32.NewProc("RegEnumKeyExW")
-	procRegQueryValueExW                 = modadvapi32.NewProc("RegQueryValueExW")
-	procGetCurrentProcessId              = modkernel32.NewProc("GetCurrentProcessId")
-	procGetConsoleMode                   = modkernel32.NewProc("GetConsoleMode")
-	procWriteConsoleW                    = modkernel32.NewProc("WriteConsoleW")
-	procReadConsoleW                     = modkernel32.NewProc("ReadConsoleW")
-	procWSAStartup                       = modws2_32.NewProc("WSAStartup")
-	procWSACleanup                       = modws2_32.NewProc("WSACleanup")
-	procWSAIoctl                         = modws2_32.NewProc("WSAIoctl")
-	procsocket                           = modws2_32.NewProc("socket")
-	procsetsockopt                       = modws2_32.NewProc("setsockopt")
-	procgetsockopt                       = modws2_32.NewProc("getsockopt")
-	procbind                             = modws2_32.NewProc("bind")
-	procconnect                          = modws2_32.NewProc("connect")
-	procgetsockname                      = modws2_32.NewProc("getsockname")
-	procgetpeername                      = modws2_32.NewProc("getpeername")
-	proclisten                           = modws2_32.NewProc("listen")
-	procshutdown                         = modws2_32.NewProc("shutdown")
-	procclosesocket                      = modws2_32.NewProc("closesocket")
-	procAcceptEx                         = modmswsock.NewProc("AcceptEx")
-	procGetAcceptExSockaddrs             = modmswsock.NewProc("GetAcceptExSockaddrs")
-	procWSARecv                          = modws2_32.NewProc("WSARecv")
-	procWSASend                          = modws2_32.NewProc("WSASend")
-	procWSARecvFrom                      = modws2_32.NewProc("WSARecvFrom")
-	procWSASendTo                        = modws2_32.NewProc("WSASendTo")
-	procgethostbyname                    = modws2_32.NewProc("gethostbyname")
-	procgetservbyname                    = modws2_32.NewProc("getservbyname")
-	procntohs                            = modws2_32.NewProc("ntohs")
-	procgetprotobyname                   = modws2_32.NewProc("getprotobyname")
-	procDnsQuery_W                       = moddnsapi.NewProc("DnsQuery_W")
-	procDnsRecordListFree                = moddnsapi.NewProc("DnsRecordListFree")
-	procGetAddrInfoW                     = modws2_32.NewProc("GetAddrInfoW")
-	procFreeAddrInfoW                    = modws2_32.NewProc("FreeAddrInfoW")
-	procGetIfEntry                       = modiphlpapi.NewProc("GetIfEntry")
-	procGetAdaptersInfo                  = modiphlpapi.NewProc("GetAdaptersInfo")
-	procTranslateNameW                   = modsecur32.NewProc("TranslateNameW")
-	procGetUserNameExW                   = modsecur32.NewProc("GetUserNameExW")
-	procNetUserGetInfo                   = modnetapi32.NewProc("NetUserGetInfo")
-	procNetGetJoinInformation            = modnetapi32.NewProc("NetGetJoinInformation")
-	procNetApiBufferFree                 = modnetapi32.NewProc("NetApiBufferFree")
-	procLookupAccountSidW                = modadvapi32.NewProc("LookupAccountSidW")
-	procLookupAccountNameW               = modadvapi32.NewProc("LookupAccountNameW")
-	procConvertSidToStringSidW           = modadvapi32.NewProc("ConvertSidToStringSidW")
-	procConvertStringSidToSidW           = modadvapi32.NewProc("ConvertStringSidToSidW")
-	procGetLengthSid                     = modadvapi32.NewProc("GetLengthSid")
-	procCopySid                          = modadvapi32.NewProc("CopySid")
-	procOpenProcessToken                 = modadvapi32.NewProc("OpenProcessToken")
-	procGetTokenInformation              = modadvapi32.NewProc("GetTokenInformation")
-	procGetUserProfileDirectoryW         = moduserenv.NewProc("GetUserProfileDirectoryW")
+	procGetLastError                       = modkernel32.NewProc("GetLastError")
+	procLoadLibraryW                       = modkernel32.NewProc("LoadLibraryW")
+	procFreeLibrary                        = modkernel32.NewProc("FreeLibrary")
+	procGetProcAddress                     = modkernel32.NewProc("GetProcAddress")
+	procGetVersion                         = modkernel32.NewProc("GetVersion")
+	procFormatMessageW                     = modkernel32.NewProc("FormatMessageW")
+	procExitProcess                        = modkernel32.NewProc("ExitProcess")
+	procCreateFileW                        = modkernel32.NewProc("CreateFileW")
+	procReadFile                           = modkernel32.NewProc("ReadFile")
+	procWriteFile                          = modkernel32.NewProc("WriteFile")
+	procSetFilePointer                     = modkernel32.NewProc("SetFilePointer")
+	procCloseHandle                        = modkernel32.NewProc("CloseHandle")
+	procGetStdHandle                       = modkernel32.NewProc("GetStdHandle")
+	procFindFirstFileW                     = modkernel32.NewProc("FindFirstFileW")
+	procFindNextFileW                      = modkernel32.NewProc("FindNextFileW")
+	procFindClose                          = modkernel32.NewProc("FindClose")
+	procGetFileInformationByHandle         = modkernel32.NewProc("GetFileInformationByHandle")
+	procGetCurrentDirectoryW               = modkernel32.NewProc("GetCurrentDirectoryW")
+	procSetCurrentDirectoryW               = modkernel32.NewProc("SetCurrentDirectoryW")
+	procCreateDirectoryW                   = modkernel32.NewProc("CreateDirectoryW")
+	procRemoveDirectoryW                   = modkernel32.NewProc("RemoveDirectoryW")
+	procDeleteFileW                        = modkernel32.NewProc("DeleteFileW")
+	procMoveFileW                          = modkernel32.NewProc("MoveFileW")
+	procGetComputerNameW                   = modkernel32.NewProc("GetComputerNameW")
+	procSetEndOfFile                       = modkernel32.NewProc("SetEndOfFile")
+	procGetSystemTimeAsFileTime            = modkernel32.NewProc("GetSystemTimeAsFileTime")
+	procGetTimeZoneInformation             = modkernel32.NewProc("GetTimeZoneInformation")
+	procCreateIoCompletionPort             = modkernel32.NewProc("CreateIoCompletionPort")
+	procGetQueuedCompletionStatus          = modkernel32.NewProc("GetQueuedCompletionStatus")
+	procPostQueuedCompletionStatus         = modkernel32.NewProc("PostQueuedCompletionStatus")
+	procCancelIo                           = modkernel32.NewProc("CancelIo")
+	procCancelIoEx                         = modkernel32.NewProc("CancelIoEx")
+	procCreateProcessW                     = modkernel32.NewProc("CreateProcessW")
+	procOpenProcess                        = modkernel32.NewProc("OpenProcess")
+	procTerminateProcess                   = modkernel32.NewProc("TerminateProcess")
+	procGetExitCodeProcess                 = modkernel32.NewProc("GetExitCodeProcess")
+	procGetStartupInfoW                    = modkernel32.NewProc("GetStartupInfoW")
+	procGetCurrentProcess                  = modkernel32.NewProc("GetCurrentProcess")
+	procGetProcessTimes                    = modkernel32.NewProc("GetProcessTimes")
+	procDuplicateHandle                    = modkernel32.NewProc("DuplicateHandle")
+	procWaitForSingleObject                = modkernel32.NewProc("WaitForSingleObject")
+	procGetTempPathW                       = modkernel32.NewProc("GetTempPathW")
+	procCreatePipe                         = modkernel32.NewProc("CreatePipe")
+	procGetFileType                        = modkernel32.NewProc("GetFileType")
+	procCryptAcquireContextW               = modadvapi32.NewProc("CryptAcquireContextW")
+	procCryptReleaseContext                = modadvapi32.NewProc("CryptReleaseContext")
+	procCryptGenRandom                     = modadvapi32.NewProc("CryptGenRandom")
+	procGetEnvironmentStringsW             = modkernel32.NewProc("GetEnvironmentStringsW")
+	procFreeEnvironmentStringsW            = modkernel32.NewProc("FreeEnvironmentStringsW")
+	procGetEnvironmentVariableW            = modkernel32.NewProc("GetEnvironmentVariableW")
+	procSetEnvironmentVariableW            = modkernel32.NewProc("SetEnvironmentVariableW")
+	procSetFileTime                        = modkernel32.NewProc("SetFileTime")
+	procGetFileAttributesW                 = modkernel32.NewProc("GetFileAttributesW")
+	procSetFileAttributesW                 = modkernel32.NewProc("SetFileAttributesW")
+	procGetFileAttributesExW               = modkernel32.NewProc("GetFileAttributesExW")
+	procGetCommandLineW                    = modkernel32.NewProc("GetCommandLineW")
+	procCommandLineToArgvW                 = modshell32.NewProc("CommandLineToArgvW")
+	procLocalFree                          = modkernel32.NewProc("LocalFree")
+	procSetHandleInformation               = modkernel32.NewProc("SetHandleInformation")
+	procFlushFileBuffers                   = modkernel32.NewProc("FlushFileBuffers")
+	procGetFullPathNameW                   = modkernel32.NewProc("GetFullPathNameW")
+	procGetLongPathNameW                   = modkernel32.NewProc("GetLongPathNameW")
+	procGetShortPathNameW                  = modkernel32.NewProc("GetShortPathNameW")
+	procCreateFileMappingW                 = modkernel32.NewProc("CreateFileMappingW")
+	procMapViewOfFile                      = modkernel32.NewProc("MapViewOfFile")
+	procUnmapViewOfFile                    = modkernel32.NewProc("UnmapViewOfFile")
+	procFlushViewOfFile                    = modkernel32.NewProc("FlushViewOfFile")
+	procVirtualLock                        = modkernel32.NewProc("VirtualLock")
+	procVirtualUnlock                      = modkernel32.NewProc("VirtualUnlock")
+	procTransmitFile                       = modmswsock.NewProc("TransmitFile")
+	procReadDirectoryChangesW              = modkernel32.NewProc("ReadDirectoryChangesW")
+	procCertOpenSystemStoreW               = modcrypt32.NewProc("CertOpenSystemStoreW")
+	procCertOpenStore                      = modcrypt32.NewProc("CertOpenStore")
+	procCertEnumCertificatesInStore        = modcrypt32.NewProc("CertEnumCertificatesInStore")
+	procCertAddCertificateContextToStore   = modcrypt32.NewProc("CertAddCertificateContextToStore")
+	procCertCloseStore                     = modcrypt32.NewProc("CertCloseStore")
+	procCertGetCertificateChain            = modcrypt32.NewProc("CertGetCertificateChain")
+	procCertFreeCertificateChain           = modcrypt32.NewProc("CertFreeCertificateChain")
+	procCertCreateCertificateContext       = modcrypt32.NewProc("CertCreateCertificateContext")
+	procCertFreeCertificateContext         = modcrypt32.NewProc("CertFreeCertificateContext")
+	procCertVerifyCertificateChainPolicy   = modcrypt32.NewProc("CertVerifyCertificateChainPolicy")
+	procRegOpenKeyExW                      = modadvapi32.NewProc("RegOpenKeyExW")
+	procRegCloseKey                        = modadvapi32.NewProc("RegCloseKey")
+	procRegQueryInfoKeyW                   = modadvapi32.NewProc("RegQueryInfoKeyW")
+	procRegEnumKeyExW                      = modadvapi32.NewProc("RegEnumKeyExW")
+	procRegQueryValueExW                   = modadvapi32.NewProc("RegQueryValueExW")
+	procGetCurrentProcessId                = modkernel32.NewProc("GetCurrentProcessId")
+	procGetConsoleMode                     = modkernel32.NewProc("GetConsoleMode")
+	procWriteConsoleW                      = modkernel32.NewProc("WriteConsoleW")
+	procReadConsoleW                       = modkernel32.NewProc("ReadConsoleW")
+	procWSAStartup                         = modws2_32.NewProc("WSAStartup")
+	procWSACleanup                         = modws2_32.NewProc("WSACleanup")
+	procWSAIoctl                           = modws2_32.NewProc("WSAIoctl")
+	procsocket                             = modws2_32.NewProc("socket")
+	procsetsockopt                         = modws2_32.NewProc("setsockopt")
+	procgetsockopt                         = modws2_32.NewProc("getsockopt")
+	procbind                               = modws2_32.NewProc("bind")
+	procconnect                            = modws2_32.NewProc("connect")
+	procgetsockname                        = modws2_32.NewProc("getsockname")
+	procgetpeername                        = modws2_32.NewProc("getpeername")
+	proclisten                             = modws2_32.NewProc("listen")
+	procshutdown                           = modws2_32.NewProc("shutdown")
+	procclosesocket                        = modws2_32.NewProc("closesocket")
+	procAcceptEx                           = modmswsock.NewProc("AcceptEx")
+	procGetAcceptExSockaddrs               = modmswsock.NewProc("GetAcceptExSockaddrs")
+	procWSARecv                            = modws2_32.NewProc("WSARecv")
+	procWSASend                            = modws2_32.NewProc("WSASend")
+	procWSARecvFrom                        = modws2_32.NewProc("WSARecvFrom")
+	procWSASendTo                          = modws2_32.NewProc("WSASendTo")
+	procgethostbyname                      = modws2_32.NewProc("gethostbyname")
+	procgetservbyname                      = modws2_32.NewProc("getservbyname")
+	procntohs                              = modws2_32.NewProc("ntohs")
+	procgetprotobyname                     = modws2_32.NewProc("getprotobyname")
+	procDnsQuery_W                         = moddnsapi.NewProc("DnsQuery_W")
+	procDnsRecordListFree                  = moddnsapi.NewProc("DnsRecordListFree")
+	procGetAddrInfoW                       = modws2_32.NewProc("GetAddrInfoW")
+	procFreeAddrInfoW                      = modws2_32.NewProc("FreeAddrInfoW")
+	procGetIfEntry                         = modiphlpapi.NewProc("GetIfEntry")
+	procGetAdaptersInfo                    = modiphlpapi.NewProc("GetAdaptersInfo")
+	procSetFileCompletionNotificationModes = modkernel32.NewProc("SetFileCompletionNotificationModes")
+	procWSAEnumProtocolsW                  = modws2_32.NewProc("WSAEnumProtocolsW")
+	procTranslateNameW                     = modsecur32.NewProc("TranslateNameW")
+	procGetUserNameExW                     = modsecur32.NewProc("GetUserNameExW")
+	procNetUserGetInfo                     = modnetapi32.NewProc("NetUserGetInfo")
+	procNetGetJoinInformation              = modnetapi32.NewProc("NetGetJoinInformation")
+	procNetApiBufferFree                   = modnetapi32.NewProc("NetApiBufferFree")
+	procLookupAccountSidW                  = modadvapi32.NewProc("LookupAccountSidW")
+	procLookupAccountNameW                 = modadvapi32.NewProc("LookupAccountNameW")
+	procConvertSidToStringSidW             = modadvapi32.NewProc("ConvertSidToStringSidW")
+	procConvertStringSidToSidW             = modadvapi32.NewProc("ConvertStringSidToSidW")
+	procGetLengthSid                       = modadvapi32.NewProc("GetLengthSid")
+	procCopySid                            = modadvapi32.NewProc("CopySid")
+	procOpenProcessToken                   = modadvapi32.NewProc("OpenProcessToken")
+	procGetTokenInformation                = modadvapi32.NewProc("GetTokenInformation")
+	procGetUserProfileDirectoryW           = moduserenv.NewProc("GetUserProfileDirectoryW")
 )
 
 func GetLastError() (lasterr error) {
@@ -1582,6 +1584,31 @@
 	return
 }
 
+func SetFileCompletionNotificationModes(handle Handle, flags uint8) (err error) {
+	r1, _, e1 := Syscall(procSetFileCompletionNotificationModes.Addr(), 2, uintptr(handle), uintptr(flags), 0)
+	if r1 == 0 {
+		if e1 != 0 {
+			err = error(e1)
+		} else {
+			err = EINVAL
+		}
+	}
+	return
+}
+
+func WSAEnumProtocols(protocols *int32, protocolBuffer *WSAProtocolInfo, bufferLength *uint32) (n uintptr, err error) {
+	r0, _, e1 := Syscall(procWSAEnumProtocolsW.Addr(), 3, uintptr(unsafe.Pointer(protocols)), uintptr(unsafe.Pointer(protocolBuffer)), uintptr(unsafe.Pointer(bufferLength)))
+	n = uintptr(r0)
+	if n == socket_error {
+		if e1 != 0 {
+			err = error(e1)
+		} else {
+			err = EINVAL
+		}
+	}
+	return
+}
+
 func TranslateName(accName *uint16, accNameFormat uint32, desiredNameFormat uint32, translatedName *uint16, nSize *uint32) (err error) {
 	r1, _, e1 := Syscall6(procTranslateNameW.Addr(), 5, uintptr(unsafe.Pointer(accName)), uintptr(accNameFormat), uintptr(desiredNameFormat), uintptr(unsafe.Pointer(translatedName)), uintptr(unsafe.Pointer(nSize)), 0)
 	if r1&0xff == 0 {
diff --git a/src/pkg/syscall/ztypes_windows.go b/src/pkg/syscall/ztypes_windows.go
--- a/src/pkg/syscall/ztypes_windows.go
+++ b/src/pkg/syscall/ztypes_windows.go
@@ -22,6 +22,7 @@
 	ERROR_OPERATION_ABORTED   Errno = 995
 	ERROR_IO_PENDING          Errno = 997
 	ERROR_NOT_FOUND           Errno = 1168
+	WSAENOBUFS                Errno = 10055
 )
 
 const (
@@ -964,3 +965,69 @@
 	0x4660,
 	[8]byte{0x8e, 0xe9, 0x76, 0xe5, 0x8c, 0x74, 0x06, 0x3e},
 }
+
+const (
+	FILE_SKIP_COMPLETION_PORT_ON_SUCCESS = 1
+	FILE_SKIP_SET_EVENT_ON_HANDLE        = 2
+)
+
+const (
+	WSAPROTOCOL_LEN    = 255
+	MAX_PROTOCOL_CHAIN = 7
+	BASE_PROTOCOL      = 1
+	LAYERED_PROTOCOL   = 0
+
+	XP1_CONNECTIONLESS           = 0x00000001
+	XP1_GUARANTEED_DELIVERY      = 0x00000002
+	XP1_GUARANTEED_ORDER         = 0x00000004
+	XP1_MESSAGE_ORIENTED         = 0x00000008
+	XP1_PSEUDO_STREAM            = 0x00000010
+	XP1_GRACEFUL_CLOSE           = 0x00000020
+	XP1_EXPEDITED_DATA           = 0x00000040
+	XP1_CONNECT_DATA             = 0x00000080
+	XP1_DISCONNECT_DATA          = 0x00000100
+	XP1_SUPPORT_BROADCAST        = 0x00000200
+	XP1_SUPPORT_MULTIPOINT       = 0x00000400
+	XP1_MULTIPOINT_CONTROL_PLANE = 0x00000800
+	XP1_MULTIPOINT_DATA_PLANE    = 0x00001000
+	XP1_QOS_SUPPORTED            = 0x00002000
+	XP1_UNI_SEND                 = 0x00008000
+	XP1_UNI_RECV                 = 0x00010000
+	XP1_IFS_HANDLES              = 0x00020000
+	XP1_PARTIAL_MESSAGE          = 0x00040000
+	XP1_SAN_SUPPORT_SDP          = 0x00080000
+
+	PFL_MULTIPLE_PROTO_ENTRIES  = 0x00000001
+	PFL_RECOMMENDED_PROTO_ENTRY = 0x00000002
+	PFL_HIDDEN                  = 0x00000004
+	PFL_MATCHES_PROTOCOL_ZERO   = 0x00000008
+	PFL_NETWORKDIRECT_PROVIDER  = 0x00000010
+)
+
+type WSAProtocolInfo struct {
+	ServiceFlags1     uint32
+	ServiceFlags2     uint32
+	ServiceFlags3     uint32
+	ServiceFlags4     uint32
+	ProviderFlags     uint32
+	ProviderId        GUID
+	CatalogEntryId    uint32
+	ProtocolChain     WSAProtocolChain
+	Version           int32
+	AddressFamily     int32
+	MaxSockAddr       int32
+	MinSockAddr       int32
+	SocketType        int32
+	Protocol          int32
+	ProtocolMaxOffset int32
+	NetworkByteOrder  int32
+	SecurityScheme    int32
+	MessageSize       uint32
+	ProviderReserved  uint32
+	ProtocolName      [WSAPROTOCOL_LEN + 1]uint16
+}
+
+type WSAProtocolChain struct {
+	ChainLen     int32
+	ChainEntries [MAX_PROTOCOL_CHAIN]uint32
+}