/* * tclWinSock.c -- * * This file contains Windows-specific socket related code. * * Copyright (c) 1995-1997 Sun Microsystems, Inc. * * See the file "license.terms" for information on usage and redistribution * of this file, and for a DISCLAIMER OF ALL WARRANTIES. * * RCS: @(#) $Id: tclWinSock.c,v 1.36.2.6 2006/09/26 21:40:37 patthoyts Exp $ */ #include "tclWinInt.h" /* * Make sure to remove the redirection defines set in tclWinPort.h * that is in use in other sections of the core, except for us. */ #undef getservbyname #undef getsockopt #undef ntohs #undef setsockopt /* * The following variable is used to tell whether this module has been * initialized. */ static int initialized = 0; static int hostnameInitialized = 0; static char hostname[255]; /* This buffer should be big enough for * hostname plus domain name. */ TCL_DECLARE_MUTEX(socketMutex) /* * Mingw and Cygwin may not have LPFN_* typedefs. */ #ifdef HAVE_NO_LPFN_DECLS typedef SOCKET (PASCAL FAR *LPFN_ACCEPT)(SOCKET s, struct sockaddr FAR * addr, int FAR * addrlen); typedef int (PASCAL FAR *LPFN_BIND)(SOCKET s, const struct sockaddr FAR *addr, int namelen); typedef int (PASCAL FAR *LPFN_CLOSESOCKET)(SOCKET s); typedef int (PASCAL FAR *LPFN_CONNECT)(SOCKET s, const struct sockaddr FAR *name, int namelen); typedef struct hostent FAR * (PASCAL FAR *LPFN_GETHOSTBYADDR) (const char FAR *addr, int addrlen, int addrtype); typedef struct hostent FAR * (PASCAL FAR *LPFN_GETHOSTBYNAME) (const char FAR * name); typedef int (PASCAL FAR *LPFN_GETHOSTNAME)(char FAR * name, int namelen); typedef int (PASCAL FAR *LPFN_GETPEERNAME)(SOCKET sock, struct sockaddr FAR *name, int FAR *namelen); typedef struct servent FAR * (PASCAL FAR *LPFN_GETSERVBYNAME) (const char FAR * name, const char FAR * proto); typedef int (PASCAL FAR *LPFN_GETSOCKNAME)(SOCKET sock, struct sockaddr FAR *name, int FAR *namelen); typedef int (PASCAL FAR *LPFN_GETSOCKOPT)(SOCKET s, int level, int optname, char FAR * optval, int FAR *optlen); typedef u_short (PASCAL FAR *LPFN_HTONS)(u_short hostshort); typedef unsigned long (PASCAL FAR *LPFN_INET_ADDR) (const char FAR * cp); typedef char FAR * (PASCAL FAR *LPFN_INET_NTOA) (struct in_addr in); typedef int (PASCAL FAR *LPFN_IOCTLSOCKET)(SOCKET s, long cmd, u_long FAR *argp); typedef int (PASCAL FAR *LPFN_LISTEN)(SOCKET s, int backlog); typedef u_short (PASCAL FAR *LPFN_NTOHS)(u_short netshort); typedef int (PASCAL FAR *LPFN_RECV)(SOCKET s, char FAR * buf, int len, int flags); typedef int (PASCAL FAR *LPFN_SELECT)(int nfds, fd_set FAR * readfds, fd_set FAR * writefds, fd_set FAR * exceptfds, const struct timeval FAR * timeout); typedef int (PASCAL FAR *LPFN_SEND)(SOCKET s, const char FAR * buf, int len, int flags); typedef int (PASCAL FAR *LPFN_SETSOCKOPT)(SOCKET s, int level, int optname, const char FAR * optval, int optlen); typedef SOCKET (PASCAL FAR *LPFN_SOCKET)(int af, int type, int protocol); typedef int (PASCAL FAR *LPFN_WSAASYNCSELECT)(SOCKET s, HWND hWnd, u_int wMsg, long lEvent); typedef int (PASCAL FAR *LPFN_WSACLEANUP)(void); typedef int (PASCAL FAR *LPFN_WSAGETLASTERROR)(void); typedef int (PASCAL FAR *LPFN_WSASTARTUP)(WORD wVersionRequired, LPWSADATA lpWSAData); #endif /* * The following structure contains pointers to all of the WinSock API * entry points used by Tcl. It is initialized by InitSockets. Since * we dynamically load the Winsock DLL on demand, we must use this * function table to refer to functions in the winsock API. */ static struct { HMODULE hModule; /* Handle to WinSock library. */ /* Winsock 1.1 functions */ LPFN_ACCEPT accept; LPFN_BIND bind; LPFN_CLOSESOCKET closesocket; LPFN_CONNECT connect; LPFN_GETHOSTBYADDR gethostbyaddr; LPFN_GETHOSTBYNAME gethostbyname; LPFN_GETHOSTNAME gethostname; LPFN_GETPEERNAME getpeername; LPFN_GETSERVBYNAME getservbyname; LPFN_GETSOCKNAME getsockname; LPFN_GETSOCKOPT getsockopt; LPFN_HTONS htons; LPFN_INET_ADDR inet_addr; LPFN_INET_NTOA inet_ntoa; LPFN_IOCTLSOCKET ioctlsocket; LPFN_LISTEN listen; LPFN_NTOHS ntohs; LPFN_RECV recv; LPFN_SELECT select; LPFN_SEND send; LPFN_SETSOCKOPT setsockopt; LPFN_SOCKET socket; LPFN_WSAASYNCSELECT WSAAsyncSelect; LPFN_WSACLEANUP WSACleanup; LPFN_WSAGETLASTERROR WSAGetLastError; LPFN_WSASTARTUP WSAStartup; } winSock; /* * The following defines declare the messages used on socket windows. */ #define SOCKET_MESSAGE WM_USER+1 #define SOCKET_SELECT WM_USER+2 #define SOCKET_TERMINATE WM_USER+3 #define SELECT TRUE #define UNSELECT FALSE /* * The following structure is used to store the data associated with * each socket. */ typedef struct SocketInfo { Tcl_Channel channel; /* Channel associated with this * socket. */ SOCKET socket; /* Windows SOCKET handle. */ int flags; /* Bit field comprised of the flags * described below. */ int watchEvents; /* OR'ed combination of FD_READ, * FD_WRITE, FD_CLOSE, FD_ACCEPT and * FD_CONNECT that indicate which * events are interesting. */ int readyEvents; /* OR'ed combination of FD_READ, * FD_WRITE, FD_CLOSE, FD_ACCEPT and * FD_CONNECT that indicate which * events have occurred. */ int selectEvents; /* OR'ed combination of FD_READ, * FD_WRITE, FD_CLOSE, FD_ACCEPT and * FD_CONNECT that indicate which * events are currently being * selected. */ int acceptEventCount; /* Count of the current number of * FD_ACCEPTs that have arrived and * not yet processed. */ Tcl_TcpAcceptProc *acceptProc; /* Proc to call on accept. */ ClientData acceptProcData; /* The data for the accept proc. */ int lastError; /* Error code from last message. */ struct SocketInfo *nextPtr; /* The next socket on the per-thread * socket list. */ } SocketInfo; /* * The following structure is what is added to the Tcl event queue when * a socket event occurs. */ typedef struct SocketEvent { Tcl_Event header; /* Information that is standard for * all events. */ SOCKET socket; /* Socket descriptor that is ready. Used * to find the SocketInfo structure for * the file (can't point directly to the * SocketInfo structure because it could * go away while the event is queued). */ } SocketEvent; /* * This defines the minimum buffersize maintained by the kernel. */ #define TCP_BUFFER_SIZE 4096 /* * The following macros may be used to set the flags field of * a SocketInfo structure. */ #define SOCKET_ASYNC (1<<0) /* The socket is in blocking * mode. */ #define SOCKET_EOF (1<<1) /* A zero read happened on * the socket. */ #define SOCKET_ASYNC_CONNECT (1<<2) /* This socket uses async * connect. */ #define SOCKET_PENDING (1<<3) /* A message has been sent * for this socket */ typedef struct ThreadSpecificData { HWND hwnd; /* Handle to window for socket messages. */ HANDLE socketThread; /* Thread handling the window */ Tcl_ThreadId threadId; /* Parent thread. */ HANDLE readyEvent; /* Event indicating that a socket event is * ready. Also used to indicate that the * socketThread has been initialized and has * started. */ HANDLE socketListLock; /* Win32 Event to lock the socketList */ SocketInfo *socketList; /* Every open socket in this thread has an * entry on this list. */ } ThreadSpecificData; static Tcl_ThreadDataKey dataKey; static WNDCLASS windowClass; /* * Static functions defined in this file. */ static SocketInfo * CreateSocket _ANSI_ARGS_((Tcl_Interp *interp, int port, CONST char *host, int server, CONST char *myaddr, int myport, int async)); static int CreateSocketAddress _ANSI_ARGS_( (LPSOCKADDR_IN sockaddrPtr, CONST char *host, int port)); static void InitSockets _ANSI_ARGS_((void)); static SocketInfo * NewSocketInfo _ANSI_ARGS_((SOCKET socket)); static Tcl_EventCheckProc SocketCheckProc; static Tcl_EventProc SocketEventProc; static void SocketExitHandler _ANSI_ARGS_(( ClientData clientData)); static LRESULT CALLBACK SocketProc _ANSI_ARGS_((HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)); static Tcl_EventSetupProc SocketSetupProc; static int SocketsEnabled _ANSI_ARGS_((void)); static void TcpAccept _ANSI_ARGS_((SocketInfo *infoPtr)); static Tcl_DriverBlockModeProc TcpBlockProc; static Tcl_DriverCloseProc TcpCloseProc; static Tcl_DriverSetOptionProc TcpSetOptionProc; static Tcl_DriverGetOptionProc TcpGetOptionProc; static Tcl_DriverInputProc TcpInputProc; static Tcl_DriverOutputProc TcpOutputProc; static Tcl_DriverWatchProc TcpWatchProc; static Tcl_DriverGetHandleProc TcpGetHandleProc; static int WaitForSocketEvent _ANSI_ARGS_(( SocketInfo *infoPtr, int events, int *errorCodePtr)); static DWORD WINAPI SocketThread _ANSI_ARGS_((LPVOID arg)); static void TcpThreadActionProc _ANSI_ARGS_ (( ClientData instanceData, int action)); /* * This structure describes the channel type structure for TCP socket * based IO. */ static Tcl_ChannelType tcpChannelType = { "tcp", /* Type name. */ TCL_CHANNEL_VERSION_4, /* v4 channel */ TcpCloseProc, /* Close proc. */ TcpInputProc, /* Input proc. */ TcpOutputProc, /* Output proc. */ NULL, /* Seek proc. */ TcpSetOptionProc, /* Set option proc. */ TcpGetOptionProc, /* Get option proc. */ TcpWatchProc, /* Set up notifier to watch this channel. */ TcpGetHandleProc, /* Get an OS handle from channel. */ NULL, /* close2proc. */ TcpBlockProc, /* Set socket into (non-)blocking mode. */ NULL, /* flush proc. */ NULL, /* handler proc. */ NULL, /* wide seek proc */ TcpThreadActionProc, /* thread action proc */ }; /* *---------------------------------------------------------------------- * * InitSockets -- * * Initialize the socket module. Attempts to load the wsock32.dll * library and set up the winSock function table. If successful, * registers the event window for the socket notifier code. * * Assumes socketMutex is held. * * Results: * None. * * Side effects: * Dynamically loads wsock32.dll, and registers a new window * class and creates a window for use in asynchronous socket * notification. * *---------------------------------------------------------------------- */ static void InitSockets() { DWORD id; WSADATA wsaData; DWORD err; ThreadSpecificData *tsdPtr = (ThreadSpecificData *)TclThreadDataKeyGet(&dataKey); if (!initialized) { initialized = 1; Tcl_CreateExitHandler(SocketExitHandler, (ClientData) NULL); winSock.hModule = LoadLibraryA("wsock32.dll"); if (winSock.hModule == NULL) { return; } /* * Initialize the function table. */ winSock.accept = (LPFN_ACCEPT) GetProcAddress(winSock.hModule, "accept"); winSock.bind = (LPFN_BIND) GetProcAddress(winSock.hModule, "bind"); winSock.closesocket = (LPFN_CLOSESOCKET) GetProcAddress(winSock.hModule, "closesocket"); winSock.connect = (LPFN_CONNECT) GetProcAddress(winSock.hModule, "connect"); winSock.gethostbyaddr = (LPFN_GETHOSTBYADDR) GetProcAddress(winSock.hModule, "gethostbyaddr"); winSock.gethostbyname = (LPFN_GETHOSTBYNAME) GetProcAddress(winSock.hModule, "gethostbyname"); winSock.gethostname = (LPFN_GETHOSTNAME) GetProcAddress(winSock.hModule, "gethostname"); winSock.getpeername = (LPFN_GETPEERNAME) GetProcAddress(winSock.hModule, "getpeername"); winSock.getservbyname = (LPFN_GETSERVBYNAME) GetProcAddress(winSock.hModule, "getservbyname"); winSock.getsockname = (LPFN_GETSOCKNAME) GetProcAddress(winSock.hModule, "getsockname"); winSock.getsockopt = (LPFN_GETSOCKOPT) GetProcAddress(winSock.hModule, "getsockopt"); winSock.htons = (LPFN_HTONS) GetProcAddress(winSock.hModule, "htons"); winSock.inet_addr = (LPFN_INET_ADDR) GetProcAddress(winSock.hModule, "inet_addr"); winSock.inet_ntoa = (LPFN_INET_NTOA) GetProcAddress(winSock.hModule, "inet_ntoa"); winSock.ioctlsocket = (LPFN_IOCTLSOCKET) GetProcAddress(winSock.hModule, "ioctlsocket"); winSock.listen = (LPFN_LISTEN) GetProcAddress(winSock.hModule, "listen"); winSock.ntohs = (LPFN_NTOHS) GetProcAddress(winSock.hModule, "ntohs"); winSock.recv = (LPFN_RECV) GetProcAddress(winSock.hModule, "recv"); winSock.select = (LPFN_SELECT) GetProcAddress(winSock.hModule, "select"); winSock.send = (LPFN_SEND) GetProcAddress(winSock.hModule, "send"); winSock.setsockopt = (LPFN_SETSOCKOPT) GetProcAddress(winSock.hModule, "setsockopt"); winSock.socket = (LPFN_SOCKET) GetProcAddress(winSock.hModule, "socket"); winSock.WSAAsyncSelect = (LPFN_WSAASYNCSELECT) GetProcAddress(winSock.hModule, "WSAAsyncSelect"); winSock.WSACleanup = (LPFN_WSACLEANUP) GetProcAddress(winSock.hModule, "WSACleanup"); winSock.WSAGetLastError = (LPFN_WSAGETLASTERROR) GetProcAddress(winSock.hModule, "WSAGetLastError"); winSock.WSAStartup = (LPFN_WSASTARTUP) GetProcAddress(winSock.hModule, "WSAStartup"); /* * Now check that all fields are properly initialized. If not, * return zero to indicate that we failed to initialize * properly. */ if ((winSock.accept == NULL) || (winSock.bind == NULL) || (winSock.closesocket == NULL) || (winSock.connect == NULL) || (winSock.gethostbyname == NULL) || (winSock.gethostbyaddr == NULL) || (winSock.gethostname == NULL) || (winSock.getpeername == NULL) || (winSock.getservbyname == NULL) || (winSock.getsockname == NULL) || (winSock.getsockopt == NULL) || (winSock.htons == NULL) || (winSock.inet_addr == NULL) || (winSock.inet_ntoa == NULL) || (winSock.ioctlsocket == NULL) || (winSock.listen == NULL) || (winSock.ntohs == NULL) || (winSock.recv == NULL) || (winSock.select == NULL) || (winSock.send == NULL) || (winSock.setsockopt == NULL) || (winSock.socket == NULL) || (winSock.WSAAsyncSelect == NULL) || (winSock.WSACleanup == NULL) || (winSock.WSAGetLastError == NULL) || (winSock.WSAStartup == NULL)) { goto unloadLibrary; } /* * Create the async notification window with a new class. We * must create a new class to avoid a Windows 95 bug that causes * us to get the wrong message number for socket events if the * message window is a subclass of a static control. */ windowClass.style = 0; windowClass.cbClsExtra = 0; windowClass.cbWndExtra = 0; windowClass.hInstance = TclWinGetTclInstance(); windowClass.hbrBackground = NULL; windowClass.lpszMenuName = NULL; windowClass.lpszClassName = "TclSocket"; windowClass.lpfnWndProc = SocketProc; windowClass.hIcon = NULL; windowClass.hCursor = NULL; if (!RegisterClassA(&windowClass)) { TclWinConvertError(GetLastError()); goto unloadLibrary; } /* * Initialize the winsock library and check the interface * version actually loaded. We only ask for the 1.1 interface * and do require that it not be less than 1.1. */ #define WSA_VERSION_MAJOR 1 #define WSA_VERSION_MINOR 1 #define WSA_VERSION_REQD MAKEWORD(WSA_VERSION_MAJOR, WSA_VERSION_MINOR) if ((err = winSock.WSAStartup(WSA_VERSION_REQD, &wsaData)) != 0) { TclWinConvertWSAError(err); goto unloadLibrary; } /* * Note the byte positions are swapped for the comparison, so * that 0x0002 (2.0, MAKEWORD(2,0)) doesn't look less than 0x0101 * (1.1). We want the comparison to be 0x0200 < 0x0101. */ if (MAKEWORD(HIBYTE(wsaData.wVersion), LOBYTE(wsaData.wVersion)) < MAKEWORD(WSA_VERSION_MINOR, WSA_VERSION_MAJOR)) { TclWinConvertWSAError(WSAVERNOTSUPPORTED); winSock.WSACleanup(); goto unloadLibrary; } #undef WSA_VERSION_REQD #undef WSA_VERSION_MAJOR #undef WSA_VERSION_MINOR } /* * Check for per-thread initialization. */ if (tsdPtr == NULL) { tsdPtr = TCL_TSD_INIT(&dataKey); tsdPtr->socketList = NULL; tsdPtr->hwnd = NULL; tsdPtr->threadId = Tcl_GetCurrentThread(); tsdPtr->readyEvent = CreateEvent(NULL, FALSE, FALSE, NULL); if (tsdPtr->readyEvent == NULL) { goto unloadLibrary; } tsdPtr->socketListLock = CreateEvent(NULL, FALSE, TRUE, NULL); if (tsdPtr->socketListLock == NULL) { goto unloadLibrary; } tsdPtr->socketThread = CreateThread(NULL, 256, SocketThread, tsdPtr, 0, &id); if (tsdPtr->socketThread == NULL) { goto unloadLibrary; } SetThreadPriority(tsdPtr->socketThread, THREAD_PRIORITY_HIGHEST); /* * Wait for the thread to signal when the window has * been created and if it is ready to go. */ WaitForSingleObject(tsdPtr->readyEvent, INFINITE); if (tsdPtr->hwnd == NULL) { goto unloadLibrary; /* Trouble creating the window */ } Tcl_CreateEventSource(SocketSetupProc, SocketCheckProc, NULL); } return; unloadLibrary: TclpFinalizeSockets(); FreeLibrary(winSock.hModule); winSock.hModule = NULL; return; } /* *---------------------------------------------------------------------- * * SocketsEnabled -- * * Check that the WinSock DLL is loaded and ready. * * Results: * 1 if it is. * * Side effects: * None. * *---------------------------------------------------------------------- */ /* ARGSUSED */ static int SocketsEnabled() { int enabled; Tcl_MutexLock(&socketMutex); enabled = (winSock.hModule != NULL); Tcl_MutexUnlock(&socketMutex); return enabled; } /* *---------------------------------------------------------------------- * * SocketExitHandler -- * * Callback invoked during app exit clean up to delete the socket * communication window and to release the WinSock DLL. * * Results: * None. * * Side effects: * None. * *---------------------------------------------------------------------- */ /* ARGSUSED */ static void SocketExitHandler(clientData) ClientData clientData; /* Not used. */ { Tcl_MutexLock(&socketMutex); if (winSock.hModule) { /* * Make sure the socket event handling window is cleaned-up * for, at most, this thread. */ TclpFinalizeSockets(); UnregisterClass("TclSocket", TclWinGetTclInstance()); winSock.WSACleanup(); FreeLibrary(winSock.hModule); winSock.hModule = NULL; } initialized = 0; hostnameInitialized = 0; Tcl_MutexUnlock(&socketMutex); } /* *---------------------------------------------------------------------- * * TclpFinalizeSockets -- * * This function is called from Tcl_FinalizeThread to finalize * the platform specific socket subsystem. * Also, it may be called from within this module to cleanup * the state if unable to initialize the sockets subsystem. * * Results: * None. * * Side effects: * Deletes the event source and destroys the socket thread. * *---------------------------------------------------------------------- */ void TclpFinalizeSockets() { ThreadSpecificData *tsdPtr; tsdPtr = (ThreadSpecificData *)TclThreadDataKeyGet(&dataKey); if (tsdPtr != NULL) { if (tsdPtr->socketThread != NULL) { if (tsdPtr->hwnd != NULL) { PostMessage(tsdPtr->hwnd, SOCKET_TERMINATE, 0, 0); /* * Wait for the thread to exit. This ensures that we are * completely cleaned up before we leave this function. */ WaitForSingleObject(tsdPtr->readyEvent, INFINITE); tsdPtr->hwnd = NULL; } CloseHandle(tsdPtr->socketThread); tsdPtr->socketThread = NULL; } if (tsdPtr->readyEvent != NULL) { CloseHandle(tsdPtr->readyEvent); tsdPtr->readyEvent = NULL; } if (tsdPtr->socketListLock != NULL) { CloseHandle(tsdPtr->socketListLock); tsdPtr->socketListLock = NULL; } Tcl_DeleteEventSource(SocketSetupProc, SocketCheckProc, NULL); } } /* *---------------------------------------------------------------------- * * TclpHasSockets -- * * This function determines whether sockets are available on the * current system and returns an error in interp if they are not. * Note that interp may be NULL. * * Results: * Returns TCL_OK if the system supports sockets, or TCL_ERROR with * an error in interp. * * Side effects: * If not already prepared, initializes the TSD structure and * socket message handling thread associated to the calling thread * for the subsystem of the driver. * *---------------------------------------------------------------------- */ int TclpHasSockets(interp) Tcl_Interp *interp; { Tcl_MutexLock(&socketMutex); InitSockets(); Tcl_MutexUnlock(&socketMutex); if (SocketsEnabled()) { return TCL_OK; } if (interp != NULL) { Tcl_AppendResult(interp, "sockets are not available on this system", NULL); } return TCL_ERROR; } /* *---------------------------------------------------------------------- * * SocketSetupProc -- * * This procedure is invoked before Tcl_DoOneEvent blocks waiting * for an event. * * Results: * None. * * Side effects: * Adjusts the block time if needed. * *---------------------------------------------------------------------- */ void SocketSetupProc(data, flags) ClientData data; /* Not used. */ int flags; /* Event flags as passed to Tcl_DoOneEvent. */ { SocketInfo *infoPtr; Tcl_Time blockTime = { 0, 0 }; ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey); if (!(flags & TCL_FILE_EVENTS)) { return; } /* * Check to see if there is a ready socket. If so, poll. */ WaitForSingleObject(tsdPtr->socketListLock, INFINITE); for (infoPtr = tsdPtr->socketList; infoPtr != NULL; infoPtr = infoPtr->nextPtr) { if (infoPtr->readyEvents & infoPtr->watchEvents) { Tcl_SetMaxBlockTime(&blockTime); break; } } SetEvent(tsdPtr->socketListLock); } /* *---------------------------------------------------------------------- * * SocketCheckProc -- * * This procedure is called by Tcl_DoOneEvent to check the socket * event source for events. * * Results: * None. * * Side effects: * May queue an event. * *---------------------------------------------------------------------- */ static void SocketCheckProc(data, flags) ClientData data; /* Not used. */ int flags; /* Event flags as passed to Tcl_DoOneEvent. */ { SocketInfo *infoPtr; SocketEvent *evPtr; ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey); if (!(flags & TCL_FILE_EVENTS)) { return; } /* * Queue events for any ready sockets that don't already have events * queued (caused by persistent states that won't generate WinSock * events). */ WaitForSingleObject(tsdPtr->socketListLock, INFINITE); for (infoPtr = tsdPtr->socketList; infoPtr != NULL; infoPtr = infoPtr->nextPtr) { if ((infoPtr->readyEvents & infoPtr->watchEvents) && !(infoPtr->flags & SOCKET_PENDING)) { infoPtr->flags |= SOCKET_PENDING; evPtr = (SocketEvent *) ckalloc(sizeof(SocketEvent)); evPtr->header.proc = SocketEventProc; evPtr->socket = infoPtr->socket; Tcl_QueueEvent((Tcl_Event *) evPtr, TCL_QUEUE_TAIL); } } SetEvent(tsdPtr->socketListLock); } /* *---------------------------------------------------------------------- * * SocketEventProc -- * * This procedure is called by Tcl_ServiceEvent when a socket event * reaches the front of the event queue. This procedure is * responsible for notifying the generic channel code. * * Results: * Returns 1 if the event was handled, meaning it should be removed * from the queue. Returns 0 if the event was not handled, meaning * it should stay on the queue. The only time the event isn't * handled is if the TCL_FILE_EVENTS flag bit isn't set. * * Side effects: * Whatever the channel callback procedures do. * *---------------------------------------------------------------------- */ static int SocketEventProc(evPtr, flags) Tcl_Event *evPtr; /* Event to service. */ int flags; /* Flags that indicate what events to * handle, such as TCL_FILE_EVENTS. */ { SocketInfo *infoPtr; SocketEvent *eventPtr = (SocketEvent *) evPtr; int mask = 0; int events; ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey); if (!(flags & TCL_FILE_EVENTS)) { return 0; } /* * Find the specified socket on the socket list. */ WaitForSingleObject(tsdPtr->socketListLock, INFINITE); for (infoPtr = tsdPtr->socketList; infoPtr != NULL; infoPtr = infoPtr->nextPtr) { if (infoPtr->socket == eventPtr->socket) { break; } } SetEvent(tsdPtr->socketListLock); /* * Discard events that have gone stale. */ if (!infoPtr) { return 1; } infoPtr->flags &= ~SOCKET_PENDING; /* * Handle connection requests directly. */ if (infoPtr->readyEvents & FD_ACCEPT) { TcpAccept(infoPtr); return 1; } /* * Mask off unwanted events and compute the read/write mask so * we can notify the channel. */ events = infoPtr->readyEvents & infoPtr->watchEvents; if (events & FD_CLOSE) { /* * If the socket was closed and the channel is still interested * in read events, then we need to ensure that we keep polling * for this event until someone does something with the channel. * Note that we do this before calling Tcl_NotifyChannel so we don't * have to watch out for the channel being deleted out from under * us. This may cause a redundant trip through the event loop, but * it's simpler than trying to do unwind protection. */ Tcl_Time blockTime = { 0, 0 }; Tcl_SetMaxBlockTime(&blockTime); mask |= TCL_READABLE|TCL_WRITABLE; } else if (events & FD_READ) { fd_set readFds; struct timeval timeout; /* * We must check to see if data is really available, since someone * could have consumed the data in the meantime. Turn off async * notification so select will work correctly. If the socket is * still readable, notify the channel driver, otherwise reset the * async select handler and keep waiting. */ SendMessage(tsdPtr->hwnd, SOCKET_SELECT, (WPARAM) UNSELECT, (LPARAM) infoPtr); FD_ZERO(&readFds); FD_SET(infoPtr->socket, &readFds); timeout.tv_usec = 0; timeout.tv_sec = 0; if (winSock.select(0, &readFds, NULL, NULL, &timeout) != 0) { mask |= TCL_READABLE; } else { infoPtr->readyEvents &= ~(FD_READ); SendMessage(tsdPtr->hwnd, SOCKET_SELECT, (WPARAM) SELECT, (LPARAM) infoPtr); } } if (events & (FD_WRITE | FD_CONNECT)) { mask |= TCL_WRITABLE; if (events & FD_CONNECT && infoPtr->lastError != NO_ERROR) { /* connect errors should also fire the readable handler. */ mask |= TCL_READABLE; } } if (mask) { Tcl_NotifyChannel(infoPtr->channel, mask); } return 1; } /* *---------------------------------------------------------------------- * * TcpBlockProc -- * * Sets a socket into blocking or non-blocking mode. * * Results: * 0 if successful, errno if there was an error. * * Side effects: * None. * *---------------------------------------------------------------------- */ static int TcpBlockProc(instanceData, mode) ClientData instanceData; /* The socket to block/un-block. */ int mode; /* TCL_MODE_BLOCKING or * TCL_MODE_NONBLOCKING. */ { SocketInfo *infoPtr = (SocketInfo *) instanceData; if (mode == TCL_MODE_NONBLOCKING) { infoPtr->flags |= SOCKET_ASYNC; } else { infoPtr->flags &= ~(SOCKET_ASYNC); } return 0; } /* *---------------------------------------------------------------------- * * TcpCloseProc -- * * This procedure is called by the generic IO level to perform * channel type specific cleanup on a socket based channel * when the channel is closed. * * Results: * 0 if successful, the value of errno if failed. * * Side effects: * Closes the socket. * *---------------------------------------------------------------------- */ /* ARGSUSED */ static int TcpCloseProc(instanceData, interp) ClientData instanceData; /* The socket to close. */ Tcl_Interp *interp; /* Unused. */ { SocketInfo *infoPtr = (SocketInfo *) instanceData; /* TIP #218 */ int errorCode = 0; ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey); /* * Check that WinSock is initialized; do not call it if not, to * prevent system crashes. This can happen at exit time if the exit * handler for WinSock ran before other exit handlers that want to * use sockets. */ if (SocketsEnabled()) { /* * Clean up the OS socket handle. The default Windows setting * for a socket is SO_DONTLINGER, which does a graceful shutdown * in the background. */ if (winSock.closesocket(infoPtr->socket) == SOCKET_ERROR) { TclWinConvertWSAError((DWORD) winSock.WSAGetLastError()); errorCode = Tcl_GetErrno(); } } /* TIP #218. Removed the code removing the structure * from the global socket list. This is now done by * the thread action callbacks, and only there. This * happens before this code is called. We can free * without fear of damanging the list. */ ckfree((char *) infoPtr); return errorCode; } /* *---------------------------------------------------------------------- * * NewSocketInfo -- * * This function allocates and initializes a new SocketInfo * structure. * * Results: * Returns a newly allocated SocketInfo. * * Side effects: * None, except for allocation of memory. * *---------------------------------------------------------------------- */ static SocketInfo * NewSocketInfo(socket) SOCKET socket; { SocketInfo *infoPtr; infoPtr = (SocketInfo *) ckalloc((unsigned) sizeof(SocketInfo)); infoPtr->socket = socket; infoPtr->flags = 0; infoPtr->watchEvents = 0; infoPtr->readyEvents = 0; infoPtr->selectEvents = 0; infoPtr->acceptEventCount = 0; infoPtr->acceptProc = NULL; infoPtr->lastError = 0; /* TIP #218. Removed the code inserting the new structure * into the global list. This is now handled in the thread * action callbacks, and only there. */ infoPtr->nextPtr = NULL; return infoPtr; } /* *---------------------------------------------------------------------- * * CreateSocket -- * * This function opens a new socket and initializes the * SocketInfo structure. * * Results: * Returns a new SocketInfo, or NULL with an error in interp. * * Side effects: * None, except for allocation of memory. * *---------------------------------------------------------------------- */ static SocketInfo * CreateSocket(interp, port, host, server, myaddr, myport, async) Tcl_Interp *interp; /* For error reporting; can be NULL. */ int port; /* Port number to open. */ CONST char *host; /* Name of host on which to open port. */ int server; /* 1 if socket should be a server socket, * else 0 for a client socket. */ CONST char *myaddr; /* Optional client-side address */ int myport; /* Optional client-side port */ int async; /* If nonzero, connect client socket * asynchronously. */ { u_long flag = 1; /* Indicates nonblocking mode. */ int asyncConnect = 0; /* Will be 1 if async connect is * in progress. */ SOCKADDR_IN sockaddr; /* Socket address */ SOCKADDR_IN mysockaddr; /* Socket address for client */ SOCKET sock = INVALID_SOCKET; SocketInfo *infoPtr; /* The returned value. */ ThreadSpecificData *tsdPtr = (ThreadSpecificData *)TclThreadDataKeyGet(&dataKey); /* * Check that WinSock is initialized; do not call it if not, to * prevent system crashes. This can happen at exit time if the exit * handler for WinSock ran before other exit handlers that want to * use sockets. */ if (!SocketsEnabled()) { return NULL; } if (! CreateSocketAddress(&sockaddr, host, port)) { goto error; } if ((myaddr != NULL || myport != 0) && ! CreateSocketAddress(&mysockaddr, myaddr, myport)) { goto error; } sock = winSock.socket(AF_INET, SOCK_STREAM, 0); if (sock == INVALID_SOCKET) { goto error; } /* * Win-NT has a misfeature that sockets are inherited in child * processes by default. Turn off the inherit bit. */ SetHandleInformation( (HANDLE) sock, HANDLE_FLAG_INHERIT, 0 ); /* * Set kernel space buffering */ TclSockMinimumBuffers((int) sock, TCP_BUFFER_SIZE); if (server) { /* * Bind to the specified port. Note that we must not call setsockopt * with SO_REUSEADDR because Microsoft allows addresses to be reused * even if they are still in use. * * Bind should not be affected by the socket having already been * set into nonblocking mode. If there is trouble, this is one place * to look for bugs. */ if (winSock.bind(sock, (SOCKADDR *) &sockaddr, sizeof(SOCKADDR_IN)) == SOCKET_ERROR) { goto error; } /* * Set the maximum number of pending connect requests to the * max value allowed on each platform (Win32 and Win32s may be * different, and there may be differences between TCP/IP stacks). */ if (winSock.listen(sock, SOMAXCONN) == SOCKET_ERROR) { goto error; } /* * Add this socket to the global list of sockets. */ infoPtr = NewSocketInfo(sock); /* * Set up the select mask for connection request events. */ infoPtr->selectEvents = FD_ACCEPT; infoPtr->watchEvents |= FD_ACCEPT; } else { /* * Try to bind to a local port, if specified. */ if (myaddr != NULL || myport != 0) { if (winSock.bind(sock, (SOCKADDR *) &mysockaddr, sizeof(SOCKADDR_IN)) == SOCKET_ERROR) { goto error; } } /* * Set the socket into nonblocking mode if the connect should be * done in the background. */ if (async) { if (winSock.ioctlsocket(sock, (long) FIONBIO, &flag) == SOCKET_ERROR) { goto error; } } /* * Attempt to connect to the remote socket. */ if (winSock.connect(sock, (SOCKADDR *) &sockaddr, sizeof(SOCKADDR_IN)) == SOCKET_ERROR) { TclWinConvertWSAError((DWORD) winSock.WSAGetLastError()); if (Tcl_GetErrno() != EWOULDBLOCK) { goto error; } /* * The connection is progressing in the background. */ asyncConnect = 1; } /* * Add this socket to the global list of sockets. */ infoPtr = NewSocketInfo(sock); /* * Set up the select mask for read/write events. If the connect * attempt has not completed, include connect events. */ infoPtr->selectEvents = FD_READ | FD_WRITE | FD_CLOSE; if (asyncConnect) { infoPtr->flags |= SOCKET_ASYNC_CONNECT; infoPtr->selectEvents |= FD_CONNECT; } } /* * Register for interest in events in the select mask. Note that this * automatically places the socket into non-blocking mode. */ winSock.ioctlsocket(sock, (long) FIONBIO, &flag); SendMessage(tsdPtr->hwnd, SOCKET_SELECT, (WPARAM) SELECT, (LPARAM) infoPtr); return infoPtr; error: TclWinConvertWSAError((DWORD) winSock.WSAGetLastError()); if (interp != NULL) { Tcl_AppendResult(interp, "couldn't open socket: ", Tcl_PosixError(interp), (char *) NULL); } if (sock != INVALID_SOCKET) { winSock.closesocket(sock); } return NULL; } /* *---------------------------------------------------------------------- * * CreateSocketAddress -- * * This function initializes a sockaddr structure for a host and port. * * Results: * 1 if the host was valid, 0 if the host could not be converted to * an IP address. * * Side effects: * Fills in the *sockaddrPtr structure. * *---------------------------------------------------------------------- */ static int CreateSocketAddress(sockaddrPtr, host, port) LPSOCKADDR_IN sockaddrPtr; /* Socket address */ CONST char *host; /* Host. NULL implies INADDR_ANY */ int port; /* Port number */ { struct hostent *hostent; /* Host database entry */ struct in_addr addr; /* For 64/32 bit madness */ /* * Check that WinSock is initialized; do not call it if not, to * prevent system crashes. This can happen at exit time if the exit * handler for WinSock ran before other exit handlers that want to * use sockets. */ if (!SocketsEnabled()) { Tcl_SetErrno(EFAULT); return 0; } ZeroMemory(sockaddrPtr, sizeof(SOCKADDR_IN)); sockaddrPtr->sin_family = AF_INET; sockaddrPtr->sin_port = winSock.htons((u_short) (port & 0xFFFF)); if (host == NULL) { addr.s_addr = INADDR_ANY; } else { addr.s_addr = winSock.inet_addr(host); if (addr.s_addr == INADDR_NONE) { hostent = winSock.gethostbyname(host); if (hostent != NULL) { memcpy(&addr, hostent->h_addr, (size_t) hostent->h_length); } else { #ifdef EHOSTUNREACH Tcl_SetErrno(EHOSTUNREACH); #else #ifdef ENXIO Tcl_SetErrno(ENXIO); #endif #endif return 0; /* Error. */ } } } /* * NOTE: On 64 bit machines the assignment below is rumored to not * do the right thing. Please report errors related to this if you * observe incorrect behavior on 64 bit machines such as DEC Alphas. * Should we modify this code to do an explicit memcpy? */ sockaddrPtr->sin_addr.s_addr = addr.s_addr; return 1; /* Success. */ } /* *---------------------------------------------------------------------- * * WaitForSocketEvent -- * * Waits until one of the specified events occurs on a socket. * * Results: * Returns 1 on success or 0 on failure, with an error code in * errorCodePtr. * * Side effects: * Processes socket events off the system queue. * *---------------------------------------------------------------------- */ static int WaitForSocketEvent(infoPtr, events, errorCodePtr) SocketInfo *infoPtr; /* Information about this socket. */ int events; /* Events to look for. */ int *errorCodePtr; /* Where to store errors? */ { int result = 1; int oldMode; ThreadSpecificData *tsdPtr = (ThreadSpecificData *)TclThreadDataKeyGet(&dataKey); /* * Be sure to disable event servicing so we are truly modal. */ oldMode = Tcl_SetServiceMode(TCL_SERVICE_NONE); /* * Reset WSAAsyncSelect so we have a fresh set of events pending. */ SendMessage(tsdPtr->hwnd, SOCKET_SELECT, (WPARAM) UNSELECT, (LPARAM) infoPtr); SendMessage(tsdPtr->hwnd, SOCKET_SELECT, (WPARAM) SELECT, (LPARAM) infoPtr); while (1) { if (infoPtr->lastError) { *errorCodePtr = infoPtr->lastError; result = 0; break; } else if (infoPtr->readyEvents & events) { break; } else if (infoPtr->flags & SOCKET_ASYNC) { *errorCodePtr = EWOULDBLOCK; result = 0; break; } /* * Wait until something happens. */ WaitForSingleObject(tsdPtr->readyEvent, INFINITE); } (void) Tcl_SetServiceMode(oldMode); return result; } /* *---------------------------------------------------------------------- * * Tcl_OpenTcpClient -- * * Opens a TCP client socket and creates a channel around it. * * Results: * The channel or NULL if failed. An error message is returned * in the interpreter on failure. * * Side effects: * Opens a client socket and creates a new channel. * *---------------------------------------------------------------------- */ Tcl_Channel Tcl_OpenTcpClient(interp, port, host, myaddr, myport, async) Tcl_Interp *interp; /* For error reporting; can be NULL. */ int port; /* Port number to open. */ CONST char *host; /* Host on which to open port. */ CONST char *myaddr; /* Client-side address */ int myport; /* Client-side port */ int async; /* If nonzero, should connect * client socket asynchronously. */ { SocketInfo *infoPtr; char channelName[16 + TCL_INTEGER_SPACE]; if (TclpHasSockets(interp) != TCL_OK) { return NULL; } /* * Create a new client socket and wrap it in a channel. */ infoPtr = CreateSocket(interp, port, host, 0, myaddr, myport, async); if (infoPtr == NULL) { return NULL; } wsprintfA(channelName, "sock%d", infoPtr->socket); infoPtr->channel = Tcl_CreateChannel(&tcpChannelType, channelName, (ClientData) infoPtr, (TCL_READABLE | TCL_WRITABLE)); if (Tcl_SetChannelOption(interp, infoPtr->channel, "-translation", "auto crlf") == TCL_ERROR) { Tcl_Close((Tcl_Interp *) NULL, infoPtr->channel); return (Tcl_Channel) NULL; } if (Tcl_SetChannelOption(NULL, infoPtr->channel, "-eofchar", "") == TCL_ERROR) { Tcl_Close((Tcl_Interp *) NULL, infoPtr->channel); return (Tcl_Channel) NULL; } return infoPtr->channel; } /* *---------------------------------------------------------------------- * * Tcl_MakeTcpClientChannel -- * * Creates a Tcl_Channel from an existing client TCP socket. * * Results: * The Tcl_Channel wrapped around the preexisting TCP socket. * * Side effects: * None. * * NOTE: Code contributed by Mark Diekhans (markd@grizzly.com) * *---------------------------------------------------------------------- */ Tcl_Channel Tcl_MakeTcpClientChannel(sock) ClientData sock; /* The socket to wrap up into a channel. */ { SocketInfo *infoPtr; char channelName[16 + TCL_INTEGER_SPACE]; ThreadSpecificData *tsdPtr; if (TclpHasSockets(NULL) != TCL_OK) { return NULL; } tsdPtr = (ThreadSpecificData *)TclThreadDataKeyGet(&dataKey); /* * Set kernel space buffering and non-blocking. */ TclSockMinimumBuffers((int) sock, TCP_BUFFER_SIZE); infoPtr = NewSocketInfo((SOCKET) sock); /* * Start watching for read/write events on the socket. */ infoPtr->selectEvents = FD_READ | FD_CLOSE | FD_WRITE; SendMessage(tsdPtr->hwnd, SOCKET_SELECT, (WPARAM) SELECT, (LPARAM) infoPtr); wsprintfA(channelName, "sock%d", infoPtr->socket); infoPtr->channel = Tcl_CreateChannel(&tcpChannelType, channelName, (ClientData) infoPtr, (TCL_READABLE | TCL_WRITABLE)); Tcl_SetChannelOption(NULL, infoPtr->channel, "-translation", "auto crlf"); return infoPtr->channel; } /* *---------------------------------------------------------------------- * * Tcl_OpenTcpServer -- * * Opens a TCP server socket and creates a channel around it. * * Results: * The channel or NULL if failed. An error message is returned * in the interpreter on failure. * * Side effects: * Opens a server socket and creates a new channel. * *---------------------------------------------------------------------- */ Tcl_Channel Tcl_OpenTcpServer(interp, port, host, acceptProc, acceptProcData) Tcl_Interp *interp; /* For error reporting - may be * NULL. */ int port; /* Port number to open. */ CONST char *host; /* Name of local host. */ Tcl_TcpAcceptProc *acceptProc; /* Callback for accepting connections * from new clients. */ ClientData acceptProcData; /* Data for the callback. */ { SocketInfo *infoPtr; char channelName[16 + TCL_INTEGER_SPACE]; if (TclpHasSockets(interp) != TCL_OK) { return NULL; } /* * Create a new client socket and wrap it in a channel. */ infoPtr = CreateSocket(interp, port, host, 1, NULL, 0, 0); if (infoPtr == NULL) { return NULL; } infoPtr->acceptProc = acceptProc; infoPtr->acceptProcData = acceptProcData; wsprintfA(channelName, "sock%d", infoPtr->socket); infoPtr->channel = Tcl_CreateChannel(&tcpChannelType, channelName, (ClientData) infoPtr, 0); if (Tcl_SetChannelOption(interp, infoPtr->channel, "-eofchar", "") == TCL_ERROR) { Tcl_Close((Tcl_Interp *) NULL, infoPtr->channel); return (Tcl_Channel) NULL; } return infoPtr->channel; } /* *---------------------------------------------------------------------- * * TcpAccept -- * Accept a TCP socket connection. This is called by * SocketEventProc and it in turns calls the registered accept * procedure. * * Results: * None. * * Side effects: * Invokes the accept proc which may invoke arbitrary Tcl code. * *---------------------------------------------------------------------- */ static void TcpAccept(infoPtr) SocketInfo *infoPtr; /* Socket to accept. */ { SOCKET newSocket; SocketInfo *newInfoPtr; SOCKADDR_IN addr; int len; char channelName[16 + TCL_INTEGER_SPACE]; ThreadSpecificData *tsdPtr = (ThreadSpecificData *)TclThreadDataKeyGet(&dataKey); /* * Accept the incoming connection request. */ len = sizeof(SOCKADDR_IN); newSocket = winSock.accept(infoPtr->socket, (SOCKADDR *)&addr, &len); /* * Clear the ready mask so we can detect the next connection request. * Note that connection requests are level triggered, so if there is * a request already pending, a new event will be generated. */ if (newSocket == INVALID_SOCKET) { infoPtr->acceptEventCount = 0; infoPtr->readyEvents &= ~(FD_ACCEPT); return; } /* * It is possible that more than one FD_ACCEPT has been sent, so an extra * count must be kept. Decrement the count, and reset the readyEvent bit * if the count is no longer > 0. */ infoPtr->acceptEventCount--; if (infoPtr->acceptEventCount <= 0) { infoPtr->readyEvents &= ~(FD_ACCEPT); } /* * Win-NT has a misfeature that sockets are inherited in child * processes by default. Turn off the inherit bit. */ SetHandleInformation( (HANDLE) newSocket, HANDLE_FLAG_INHERIT, 0 ); /* * Add this socket to the global list of sockets. */ newInfoPtr = NewSocketInfo(newSocket); /* * Select on read/write events and create the channel. */ newInfoPtr->selectEvents = (FD_READ | FD_WRITE | FD_CLOSE); SendMessage(tsdPtr->hwnd, SOCKET_SELECT, (WPARAM) SELECT, (LPARAM) newInfoPtr); wsprintfA(channelName, "sock%d", newInfoPtr->socket); newInfoPtr->channel = Tcl_CreateChannel(&tcpChannelType, channelName, (ClientData) newInfoPtr, (TCL_READABLE | TCL_WRITABLE)); if (Tcl_SetChannelOption(NULL, newInfoPtr->channel, "-translation", "auto crlf") == TCL_ERROR) { Tcl_Close((Tcl_Interp *) NULL, newInfoPtr->channel); return; } if (Tcl_SetChannelOption(NULL, newInfoPtr->channel, "-eofchar", "") == TCL_ERROR) { Tcl_Close((Tcl_Interp *) NULL, newInfoPtr->channel); return; } /* * Invoke the accept callback procedure. */ if (infoPtr->acceptProc != NULL) { (infoPtr->acceptProc) (infoPtr->acceptProcData, newInfoPtr->channel, winSock.inet_ntoa(addr.sin_addr), winSock.ntohs(addr.sin_port)); } } /* *---------------------------------------------------------------------- * * TcpInputProc -- * * This procedure is called by the generic IO level to read data from * a socket based channel. * * Results: * The number of bytes read or -1 on error. * * Side effects: * Consumes input from the socket. * *---------------------------------------------------------------------- */ static int TcpInputProc(instanceData, buf, toRead, errorCodePtr) ClientData instanceData; /* The socket state. */ char *buf; /* Where to store data. */ int toRead; /* Maximum number of bytes to read. */ int *errorCodePtr; /* Where to store error codes. */ { SocketInfo *infoPtr = (SocketInfo *) instanceData; int bytesRead; DWORD error; ThreadSpecificData *tsdPtr = (ThreadSpecificData *)TclThreadDataKeyGet(&dataKey); *errorCodePtr = 0; /* * Check that WinSock is initialized; do not call it if not, to * prevent system crashes. This can happen at exit time if the exit * handler for WinSock ran before other exit handlers that want to * use sockets. */ if (!SocketsEnabled()) { *errorCodePtr = EFAULT; return -1; } /* * First check to see if EOF was already detected, to prevent * calling the socket stack after the first time EOF is detected. */ if (infoPtr->flags & SOCKET_EOF) { return 0; } /* * Check to see if the socket is connected before trying to read. */ if ((infoPtr->flags & SOCKET_ASYNC_CONNECT) && ! WaitForSocketEvent(infoPtr, FD_CONNECT, errorCodePtr)) { return -1; } /* * No EOF, and it is connected, so try to read more from the socket. * Note that we clear the FD_READ bit because read events are level * triggered so a new event will be generated if there is still data * available to be read. We have to simulate blocking behavior here * since we are always using non-blocking sockets. */ while (1) { SendMessage(tsdPtr->hwnd, SOCKET_SELECT, (WPARAM) UNSELECT, (LPARAM) infoPtr); bytesRead = winSock.recv(infoPtr->socket, buf, toRead, 0); infoPtr->readyEvents &= ~(FD_READ); /* * Check for end-of-file condition or successful read. */ if (bytesRead == 0) { infoPtr->flags |= SOCKET_EOF; } if (bytesRead != SOCKET_ERROR) { break; } /* * If an error occurs after the FD_CLOSE has arrived, * then ignore the error and report an EOF. */ if (infoPtr->readyEvents & FD_CLOSE) { infoPtr->flags |= SOCKET_EOF; bytesRead = 0; break; } /* * Check for error condition or underflow in non-blocking case. */ error = winSock.WSAGetLastError(); if ((infoPtr->flags & SOCKET_ASYNC) || (error != WSAEWOULDBLOCK)) { TclWinConvertWSAError(error); *errorCodePtr = Tcl_GetErrno(); bytesRead = -1; break; } /* * In the blocking case, wait until the file becomes readable * or closed and try again. */ if (!WaitForSocketEvent(infoPtr, FD_READ|FD_CLOSE, errorCodePtr)) { bytesRead = -1; break; } } SendMessage(tsdPtr->hwnd, SOCKET_SELECT, (WPARAM) SELECT, (LPARAM) infoPtr); return bytesRead; } /* *---------------------------------------------------------------------- * * TcpOutputProc -- * * This procedure is called by the generic IO level to write data * to a socket based channel. * * Results: * The number of bytes written or -1 on failure. * * Side effects: * Produces output on the socket. * *---------------------------------------------------------------------- */ static int TcpOutputProc(instanceData, buf, toWrite, errorCodePtr) ClientData instanceData; /* The socket state. */ CONST char *buf; /* Where to get data. */ int toWrite; /* Maximum number of bytes to write. */ int *errorCodePtr; /* Where to store error codes. */ { SocketInfo *infoPtr = (SocketInfo *) instanceData; int bytesWritten; DWORD error; ThreadSpecificData *tsdPtr = (ThreadSpecificData *)TclThreadDataKeyGet(&dataKey); *errorCodePtr = 0; /* * Check that WinSock is initialized; do not call it if not, to * prevent system crashes. This can happen at exit time if the exit * handler for WinSock ran before other exit handlers that want to * use sockets. */ if (!SocketsEnabled()) { *errorCodePtr = EFAULT; return -1; } /* * Check to see if the socket is connected before trying to write. */ if ((infoPtr->flags & SOCKET_ASYNC_CONNECT) && ! WaitForSocketEvent(infoPtr, FD_CONNECT, errorCodePtr)) { return -1; } while (1) { SendMessage(tsdPtr->hwnd, SOCKET_SELECT, (WPARAM) UNSELECT, (LPARAM) infoPtr); bytesWritten = winSock.send(infoPtr->socket, buf, toWrite, 0); if (bytesWritten != SOCKET_ERROR) { /* * Since Windows won't generate a new write event until we hit * an overflow condition, we need to force the event loop to * poll until the condition changes. */ if (infoPtr->watchEvents & FD_WRITE) { Tcl_Time blockTime = { 0, 0 }; Tcl_SetMaxBlockTime(&blockTime); } break; } /* * Check for error condition or overflow. In the event of overflow, we * need to clear the FD_WRITE flag so we can detect the next writable * event. Note that Windows only sends a new writable event after a * send fails with WSAEWOULDBLOCK. */ error = winSock.WSAGetLastError(); if (error == WSAEWOULDBLOCK) { infoPtr->readyEvents &= ~(FD_WRITE); if (infoPtr->flags & SOCKET_ASYNC) { *errorCodePtr = EWOULDBLOCK; bytesWritten = -1; break; } } else { TclWinConvertWSAError(error); *errorCodePtr = Tcl_GetErrno(); bytesWritten = -1; break; } /* * In the blocking case, wait until the file becomes writable * or closed and try again. */ if (!WaitForSocketEvent(infoPtr, FD_WRITE|FD_CLOSE, errorCodePtr)) { bytesWritten = -1; break; } } SendMessage(tsdPtr->hwnd, SOCKET_SELECT, (WPARAM) SELECT, (LPARAM) infoPtr); return bytesWritten; } /* *---------------------------------------------------------------------- * * TcpSetOptionProc -- * * Sets Tcp channel specific options. * * Results: * None, unless an error happens. * * Side effects: * Changes attributes of the socket at the system level. * *---------------------------------------------------------------------- */ static int TcpSetOptionProc ( ClientData instanceData, /* Socket state. */ Tcl_Interp *interp, /* For error reporting - can be NULL. */ CONST char *optionName, /* Name of the option to set. */ CONST char *value) /* New value for option. */ { SocketInfo *infoPtr; SOCKET sock; /* BOOL val = FALSE; int boolVar, rtn; */ /* * Check that WinSock is initialized; do not call it if not, to * prevent system crashes. This can happen at exit time if the exit * handler for WinSock ran before other exit handlers that want to * use sockets. */ if (!SocketsEnabled()) { if (interp) { Tcl_AppendResult(interp, "winsock is not initialized", NULL); } return TCL_ERROR; } infoPtr = (SocketInfo *) instanceData; sock = infoPtr->socket; /* if (!stricmp(optionName, "-keepalive")) { if (Tcl_GetBoolean(interp, value, &boolVar) != TCL_OK) { return TCL_ERROR; } if (boolVar) val = TRUE; rtn = winSock.setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, (const char *) &val, sizeof(BOOL)); if (rtn != 0) { TclWinConvertWSAError(winSock.WSAGetLastError()); if (interp) { Tcl_AppendResult(interp, "couldn't set socket option: ", Tcl_PosixError(interp), NULL); } return TCL_ERROR; } return TCL_OK; } else if (!stricmp(optionName, "-nagle")) { if (Tcl_GetBoolean(interp, value, &boolVar) != TCL_OK) { return TCL_ERROR; } if (!boolVar) val = TRUE; rtn = winSock.setsockopt(sock, IPPROTO_TCP, TCP_NODELAY, (const char *) &val, sizeof(BOOL)); if (rtn != 0) { TclWinConvertWSAError(winSock.WSAGetLastError()); if (interp) { Tcl_AppendResult(interp, "couldn't set socket option: ", Tcl_PosixError(interp), NULL); } return TCL_ERROR; } return TCL_OK; } return Tcl_BadChannelOption(interp, optionName, "keepalive nagle"); */ return Tcl_BadChannelOption(interp, optionName, ""); } /* *---------------------------------------------------------------------- * * TcpGetOptionProc -- * * Computes an option value for a TCP socket based channel, or a * list of all options and their values. * * Note: This code is based on code contributed by John Haxby. * * Results: * A standard Tcl result. The value of the specified option or a * list of all options and their values is returned in the * supplied DString. * * Side effects: * None. * *---------------------------------------------------------------------- */ static int TcpGetOptionProc(instanceData, interp, optionName, dsPtr) ClientData instanceData; /* Socket state. */ Tcl_Interp *interp; /* For error reporting - can be NULL */ CONST char *optionName; /* Name of the option to * retrieve the value for, or * NULL to get all options and * their values. */ Tcl_DString *dsPtr; /* Where to store the computed * value; initialized by caller. */ { SocketInfo *infoPtr; SOCKADDR_IN sockname; SOCKADDR_IN peername; struct hostent *hostEntPtr; SOCKET sock; int size = sizeof(SOCKADDR_IN); size_t len = 0; char buf[TCL_INTEGER_SPACE]; /* * Check that WinSock is initialized; do not call it if not, to * prevent system crashes. This can happen at exit time if the exit * handler for WinSock ran before other exit handlers that want to * use sockets. */ if (!SocketsEnabled()) { if (interp) { Tcl_AppendResult(interp, "winsock is not initialized", NULL); } return TCL_ERROR; } infoPtr = (SocketInfo *) instanceData; sock = (int) infoPtr->socket; if (optionName != (char *) NULL) { len = strlen(optionName); } if ((len > 1) && (optionName[1] == 'e') && (strncmp(optionName, "-error", len) == 0)) { int optlen; DWORD err; int ret; optlen = sizeof(int); ret = TclWinGetSockOpt(sock, SOL_SOCKET, SO_ERROR, (char *)&err, &optlen); if (ret == SOCKET_ERROR) { err = winSock.WSAGetLastError(); } if (err) { TclWinConvertWSAError(err); Tcl_DStringAppend(dsPtr, Tcl_ErrnoMsg(Tcl_GetErrno()), -1); } return TCL_OK; } if ((len == 0) || ((len > 1) && (optionName[1] == 'p') && (strncmp(optionName, "-peername", len) == 0))) { if (winSock.getpeername(sock, (LPSOCKADDR) &peername, &size) == 0) { if (len == 0) { Tcl_DStringAppendElement(dsPtr, "-peername"); Tcl_DStringStartSublist(dsPtr); } Tcl_DStringAppendElement(dsPtr, winSock.inet_ntoa(peername.sin_addr)); if (peername.sin_addr.s_addr == 0) { hostEntPtr = (struct hostent *) NULL; } else { hostEntPtr = winSock.gethostbyaddr( (char *) &(peername.sin_addr), sizeof(peername.sin_addr), AF_INET); } if (hostEntPtr != (struct hostent *) NULL) { Tcl_DStringAppendElement(dsPtr, hostEntPtr->h_name); } else { Tcl_DStringAppendElement(dsPtr, winSock.inet_ntoa(peername.sin_addr)); } TclFormatInt(buf, winSock.ntohs(peername.sin_port)); Tcl_DStringAppendElement(dsPtr, buf); if (len == 0) { Tcl_DStringEndSublist(dsPtr); } else { return TCL_OK; } } else { /* * getpeername failed - but if we were asked for all the options * (len==0), don't flag an error at that point because it could * be an fconfigure request on a server socket. (which have * no peer). {copied from unix/tclUnixChan.c} */ if (len) { TclWinConvertWSAError((DWORD) winSock.WSAGetLastError()); if (interp) { Tcl_AppendResult(interp, "can't get peername: ", Tcl_PosixError(interp), (char *) NULL); } return TCL_ERROR; } } } if ((len == 0) || ((len > 1) && (optionName[1] == 's') && (strncmp(optionName, "-sockname", len) == 0))) { if (winSock.getsockname(sock, (LPSOCKADDR) &sockname, &size) == 0) { if (len == 0) { Tcl_DStringAppendElement(dsPtr, "-sockname"); Tcl_DStringStartSublist(dsPtr); } Tcl_DStringAppendElement(dsPtr, winSock.inet_ntoa(sockname.sin_addr)); if (sockname.sin_addr.s_addr == 0) { hostEntPtr = (struct hostent *) NULL; } else { hostEntPtr = winSock.gethostbyaddr( (char *) &(sockname.sin_addr), sizeof(peername.sin_addr), AF_INET); } if (hostEntPtr != (struct hostent *) NULL) { Tcl_DStringAppendElement(dsPtr, hostEntPtr->h_name); } else { Tcl_DStringAppendElement(dsPtr, winSock.inet_ntoa(sockname.sin_addr)); } TclFormatInt(buf, winSock.ntohs(sockname.sin_port)); Tcl_DStringAppendElement(dsPtr, buf); if (len == 0) { Tcl_DStringEndSublist(dsPtr); } else { return TCL_OK; } } else { if (interp) { TclWinConvertWSAError((DWORD) winSock.WSAGetLastError()); Tcl_AppendResult(interp, "can't get sockname: ", Tcl_PosixError(interp), (char *) NULL); } return TCL_ERROR; } } /* if (len == 0 || !strncmp(optionName, "-keepalive", len)) { int optlen; BOOL opt = FALSE; if (len == 0) { Tcl_DStringAppendElement(dsPtr, "-keepalive"); } optlen = sizeof(BOOL); winSock.getsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, (char *)&opt, &optlen); if (opt) { Tcl_DStringAppendElement(dsPtr, "1"); } else { Tcl_DStringAppendElement(dsPtr, "0"); } if (len > 0) return TCL_OK; } if (len == 0 || !strncmp(optionName, "-nagle", len)) { int optlen; BOOL opt = FALSE; if (len == 0) { Tcl_DStringAppendElement(dsPtr, "-nagle"); } optlen = sizeof(BOOL); winSock.getsockopt(sock, IPPROTO_TCP, TCP_NODELAY, (char *)&opt, &optlen); if (opt) { Tcl_DStringAppendElement(dsPtr, "0"); } else { Tcl_DStringAppendElement(dsPtr, "1"); } if (len > 0) return TCL_OK; } */ if (len > 0) { /*return Tcl_BadChannelOption(interp, optionName, "peername sockname keepalive nagle");*/ return Tcl_BadChannelOption(interp, optionName, "peername sockname"); } return TCL_OK; } /* *---------------------------------------------------------------------- * * TcpWatchProc -- * * Informs the channel driver of the events that the generic * channel code wishes to receive on this socket. * * Results: * None. * * Side effects: * May cause the notifier to poll if any of the specified * conditions are already true. * *---------------------------------------------------------------------- */ static void TcpWatchProc(instanceData, mask) ClientData instanceData; /* The socket state. */ int mask; /* Events of interest; an OR-ed * combination of TCL_READABLE, * TCL_WRITABLE and TCL_EXCEPTION. */ { SocketInfo *infoPtr = (SocketInfo *) instanceData; /* * Update the watch events mask. Only if the socket is not a * server socket. Fix for SF Tcl Bug #557878. */ if (!infoPtr->acceptProc) { infoPtr->watchEvents = 0; if (mask & TCL_READABLE) { infoPtr->watchEvents |= (FD_READ|FD_CLOSE|FD_ACCEPT); } if (mask & TCL_WRITABLE) { infoPtr->watchEvents |= (FD_WRITE|FD_CLOSE|FD_CONNECT); } /* * If there are any conditions already set, then tell the notifier to poll * rather than block. */ if (infoPtr->readyEvents & infoPtr->watchEvents) { Tcl_Time blockTime = { 0, 0 }; Tcl_SetMaxBlockTime(&blockTime); } } } /* *---------------------------------------------------------------------- * * TcpGetProc -- * * Called from Tcl_GetChannelHandle to retrieve an OS handle from inside * a TCP socket based channel. * * Results: * Returns TCL_OK with the socket in handlePtr. * * Side effects: * None. * *---------------------------------------------------------------------- */ static int TcpGetHandleProc(instanceData, direction, handlePtr) ClientData instanceData; /* The socket state. */ int direction; /* Not used. */ ClientData *handlePtr; /* Where to store the handle. */ { SocketInfo *statePtr = (SocketInfo *) instanceData; *handlePtr = (ClientData) statePtr->socket; return TCL_OK; } /* *---------------------------------------------------------------------- * * SocketThread -- * * Helper thread used to manage the socket event handling window. * * Results: * 1 if unable to create socket event window, 0 otherwise. * * Side effects: * None. * *---------------------------------------------------------------------- */ static DWORD WINAPI SocketThread(LPVOID arg) { MSG msg; ThreadSpecificData *tsdPtr = (ThreadSpecificData *)(arg); /* * Create a dummy window receiving socket events. */ tsdPtr->hwnd = CreateWindow("TclSocket", "TclSocket", WS_TILED, 0, 0, 0, 0, NULL, NULL, windowClass.hInstance, arg); /* * Signalize thread creator that we are done creating the window. */ SetEvent(tsdPtr->readyEvent); /* * If unable to create the window, exit this thread immediately. */ if (tsdPtr->hwnd == NULL) { return 1; } /* * Process all messages on the socket window until WM_QUIT. * This threads exits only when instructed to do so by the * call to PostMessage(SOCKET_TERMINATE) in TclpFinalizeSockets(). */ while (GetMessage(&msg, NULL, 0, 0) > 0) { DispatchMessage(&msg); } /* * This releases waiters on thread exit in TclpFinalizeSockets() */ SetEvent(tsdPtr->readyEvent); return (DWORD)msg.wParam; } /* *---------------------------------------------------------------------- * * SocketProc -- * * This function is called when WSAAsyncSelect has been used * to register interest in a socket event, and the event has * occurred. * * Results: * 0 on success. * * Side effects: * The flags for the given socket are updated to reflect the * event that occured. * *---------------------------------------------------------------------- */ static LRESULT CALLBACK SocketProc(hwnd, message, wParam, lParam) HWND hwnd; UINT message; WPARAM wParam; LPARAM lParam; { int event, error; SOCKET socket; SocketInfo *infoPtr; ThreadSpecificData *tsdPtr = #ifdef _WIN64 (ThreadSpecificData *) GetWindowLongPtr(hwnd, GWLP_USERDATA); #else (ThreadSpecificData *) GetWindowLong(hwnd, GWL_USERDATA); #endif switch (message) { default: return DefWindowProc(hwnd, message, wParam, lParam); break; case WM_CREATE: /* * store the initial tsdPtr, it's from a different thread, so it's * not directly accessible, but needed. */ #ifdef _WIN64 SetWindowLongPtr(hwnd, GWLP_USERDATA, (LONG_PTR) ((LPCREATESTRUCT)lParam)->lpCreateParams); #else SetWindowLong(hwnd, GWL_USERDATA, (LONG) ((LPCREATESTRUCT)lParam)->lpCreateParams); #endif break; case WM_DESTROY: PostQuitMessage(0); break; case SOCKET_MESSAGE: event = WSAGETSELECTEVENT(lParam); error = WSAGETSELECTERROR(lParam); socket = (SOCKET) wParam; /* * Find the specified socket on the socket list and update its * eventState flag. */ WaitForSingleObject(tsdPtr->socketListLock, INFINITE); for (infoPtr = tsdPtr->socketList; infoPtr != NULL; infoPtr = infoPtr->nextPtr) { if (infoPtr->socket == socket) { /* * Update the socket state. */ /* * A count of FD_ACCEPTS is stored, so if an FD_CLOSE * event happens, then clear the FD_ACCEPT count. * Otherwise, increment the count if the current * event is an FD_ACCEPT. */ if (event & FD_CLOSE) { infoPtr->acceptEventCount = 0; infoPtr->readyEvents &= ~(FD_WRITE|FD_ACCEPT); } else if (event & FD_ACCEPT) { infoPtr->acceptEventCount++; } if (event & FD_CONNECT) { /* * The socket is now connected, * clear the async connect flag. */ infoPtr->flags &= ~(SOCKET_ASYNC_CONNECT); /* * Remember any error that occurred so we can report * connection failures. */ if (error != ERROR_SUCCESS) { TclWinConvertWSAError((DWORD) error); infoPtr->lastError = Tcl_GetErrno(); } } if(infoPtr->flags & SOCKET_ASYNC_CONNECT) { infoPtr->flags &= ~(SOCKET_ASYNC_CONNECT); if (error != ERROR_SUCCESS) { TclWinConvertWSAError((DWORD) error); infoPtr->lastError = Tcl_GetErrno(); } infoPtr->readyEvents |= FD_WRITE; } infoPtr->readyEvents |= event; /* * Wake up the Main Thread. */ SetEvent(tsdPtr->readyEvent); Tcl_ThreadAlert(tsdPtr->threadId); break; } } SetEvent(tsdPtr->socketListLock); break; case SOCKET_SELECT: infoPtr = (SocketInfo *) lParam; if (wParam == SELECT) { winSock.WSAAsyncSelect(infoPtr->socket, hwnd, SOCKET_MESSAGE, infoPtr->selectEvents); } else { /* * Clear the selection mask */ winSock.WSAAsyncSelect(infoPtr->socket, hwnd, 0, 0); } break; case SOCKET_TERMINATE: DestroyWindow(hwnd); break; } return 0; } /* *---------------------------------------------------------------------- * * Tcl_GetHostName -- * * Returns the name of the local host. * * Results: * A string containing the network name for this machine, or * an empty string if we can't figure out the name. The caller * must not modify or free this string. * * Side effects: * None. * *---------------------------------------------------------------------- */ CONST char * Tcl_GetHostName() { DWORD length; WCHAR wbuf[MAX_COMPUTERNAME_LENGTH + 1]; Tcl_MutexLock(&socketMutex); InitSockets(); if (hostnameInitialized) { Tcl_MutexUnlock(&socketMutex); return hostname; } Tcl_MutexUnlock(&socketMutex); if (TclpHasSockets(NULL) == TCL_OK) { /* * INTL: bug */ if (winSock.gethostname(hostname, sizeof(hostname)) == 0) { Tcl_MutexLock(&socketMutex); hostnameInitialized = 1; Tcl_MutexUnlock(&socketMutex); return hostname; } } Tcl_MutexLock(&socketMutex); length = sizeof(hostname); if ((*tclWinProcs->getComputerNameProc)(wbuf, &length) != 0) { /* * Convert string from native to UTF then change to lowercase. */ Tcl_DString ds; lstrcpynA(hostname, Tcl_WinTCharToUtf((TCHAR *) wbuf, -1, &ds), sizeof(hostname)); Tcl_DStringFree(&ds); Tcl_UtfToLower(hostname); } else { hostname[0] = '\0'; } hostnameInitialized = 1; Tcl_MutexUnlock(&socketMutex); return hostname; } /* *---------------------------------------------------------------------- * * TclWinGetSockOpt, et al. -- * * These functions are wrappers that let us bind the WinSock * API dynamically so we can run on systems that don't have * the wsock32.dll. We need wrappers for these interfaces * because they are called from the generic Tcl code. * * Results: * As defined for each function. * * Side effects: * As defined for each function. * *---------------------------------------------------------------------- */ int TclWinGetSockOpt(SOCKET s, int level, int optname, char * optval, int FAR *optlen) { /* * Check that WinSock is initialized; do not call it if not, to * prevent system crashes. This can happen at exit time if the exit * handler for WinSock ran before other exit handlers that want to * use sockets. */ if (!SocketsEnabled()) { return SOCKET_ERROR; } return winSock.getsockopt(s, level, optname, optval, optlen); } int TclWinSetSockOpt(SOCKET s, int level, int optname, const char * optval, int optlen) { /* * Check that WinSock is initialized; do not call it if not, to * prevent system crashes. This can happen at exit time if the exit * handler for WinSock ran before other exit handlers that want to * use sockets. */ if (!SocketsEnabled()) { return SOCKET_ERROR; } return winSock.setsockopt(s, level, optname, optval, optlen); } u_short TclWinNToHS(u_short netshort) { /* * Check that WinSock is initialized; do not call it if not, to * prevent system crashes. This can happen at exit time if the exit * handler for WinSock ran before other exit handlers that want to * use sockets. */ if (!SocketsEnabled()) { return (u_short) -1; } return winSock.ntohs(netshort); } struct servent * TclWinGetServByName(const char * name, const char * proto) { /* * Check that WinSock is initialized; do not call it if not, to * prevent system crashes. This can happen at exit time if the exit * handler for WinSock ran before other exit handlers that want to * use sockets. */ if (!SocketsEnabled()) { return (struct servent *) NULL; } return winSock.getservbyname(name, proto); } /* *---------------------------------------------------------------------- * * TcpThreadActionProc -- * * Insert or remove any thread local refs to this channel. * * Results: * None. * * Side effects: * Changes thread local list of valid channels. * *---------------------------------------------------------------------- */ static void TcpThreadActionProc (instanceData, action) ClientData instanceData; int action; { ThreadSpecificData *tsdPtr; SocketInfo *infoPtr = (SocketInfo *) instanceData; int notifyCmd; if (action == TCL_CHANNEL_THREAD_INSERT) { /* * Ensure that socket subsystem is initialized in this thread, or * else sockets will not work. */ Tcl_MutexLock(&socketMutex); InitSockets(); Tcl_MutexUnlock(&socketMutex); tsdPtr = TCL_TSD_INIT(&dataKey); WaitForSingleObject(tsdPtr->socketListLock, INFINITE); infoPtr->nextPtr = tsdPtr->socketList; tsdPtr->socketList = infoPtr; SetEvent(tsdPtr->socketListLock); notifyCmd = SELECT; } else { SocketInfo **nextPtrPtr; int removed = 0; tsdPtr = TCL_TSD_INIT(&dataKey); /* TIP #218, Bugfix: All access to socketList has to be protected by the lock */ WaitForSingleObject(tsdPtr->socketListLock, INFINITE); for (nextPtrPtr = &(tsdPtr->socketList); (*nextPtrPtr) != NULL; nextPtrPtr = &((*nextPtrPtr)->nextPtr)) { if ((*nextPtrPtr) == infoPtr) { (*nextPtrPtr) = infoPtr->nextPtr; removed = 1; break; } } SetEvent(tsdPtr->socketListLock); /* * This could happen if the channel was created in one thread * and then moved to another without updating the thread * local data in each thread. */ if (!removed) { Tcl_Panic("file info ptr not on thread channel list"); } notifyCmd = UNSELECT; } /* * Ensure that, or stop, notifications for the socket occur in this thread. */ SendMessage(tsdPtr->hwnd, SOCKET_SELECT, (WPARAM) notifyCmd, (LPARAM) infoPtr); }