From ea87cfa4ba59b76ecb3f0ebc9ae90dbfde6871f1 Mon Sep 17 00:00:00 2001 From: stanton Date: Tue, 8 Jun 1999 19:02:15 +0000 Subject: * win/tclWinSock.c: Rolled back to the 8.1.0 implementation because of serious problems with the new driver. Basically no incoming socket connections would be reported to a server port. The 8.1.1 code needs to be redesigned and fixed correctly. --- win/tclWinSock.c | 4953 +++++++++++++++++++++++++----------------------------- 1 file changed, 2279 insertions(+), 2674 deletions(-) diff --git a/win/tclWinSock.c b/win/tclWinSock.c index 03ded94..03fb703 100644 --- a/win/tclWinSock.c +++ b/win/tclWinSock.c @@ -1,2674 +1,2279 @@ -/* - * 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 1.10 1999/05/26 20:24:43 redman Exp $ - */ - -#include "tclWinInt.h" - -/* - * 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. */ -static int useThreads = 0; - -static HANDLE socketThread; /* Thread used with WSAEventSelect to check - sockets for fileevents on NT (not used for - Win95 or Win98) */ -static WSAEVENT socketEvent; /* Event triggered by WSAEventSelect, for all - sockets, NT only */ -static WSAEVENT killEvent; /* Event used to kill off the socketThread, NT - only */ - -static CRITICAL_SECTION socketCS; /* Critical Section used even when building - without threads */ -TCL_DECLARE_MUTEX(socketMutex) /* Mutex used when built with multithreading - */ - - -/* - * 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 Winsock.dll on demand, we must use this function table - * to refer to functions in the socket API. - */ - -static struct { - HINSTANCE hInstance; /* Handle to WinSock library. */ - SOCKET (PASCAL FAR *accept)(SOCKET s, struct sockaddr FAR *addr, - int FAR *addrlen); - int (PASCAL FAR *bind)(SOCKET s, const struct sockaddr FAR *addr, - int namelen); - int (PASCAL FAR *closesocket)(SOCKET s); - int (PASCAL FAR *connect)(SOCKET s, const struct sockaddr FAR *name, - int namelen); - int (PASCAL FAR *ioctlsocket)(SOCKET s, long cmd, u_long FAR *argp); - int (PASCAL FAR *getsockopt)(SOCKET s, int level, int optname, - char FAR * optval, int FAR *optlen); - u_short (PASCAL FAR *htons)(u_short hostshort); - unsigned long (PASCAL FAR *inet_addr)(const char FAR * cp); - char FAR * (PASCAL FAR *inet_ntoa)(struct in_addr in); - int (PASCAL FAR *listen)(SOCKET s, int backlog); - u_short (PASCAL FAR *ntohs)(u_short netshort); - int (PASCAL FAR *recv)(SOCKET s, char FAR * buf, int len, int flags); - int (PASCAL FAR *select)(int nfds, fd_set FAR * readfds, - fd_set FAR * writefds, fd_set FAR * exceptfds, - const struct timeval FAR * tiemout); - int (PASCAL FAR *send)(SOCKET s, const char FAR * buf, int len, int flags); - int (PASCAL FAR *setsockopt)(SOCKET s, int level, int optname, - const char FAR * optval, int optlen); - int (PASCAL FAR *shutdown)(SOCKET s, int how); - SOCKET (PASCAL FAR *socket)(int af, int type, int protocol); - struct hostent FAR * (PASCAL FAR *gethostbyname)(const char FAR * name); - struct hostent FAR * (PASCAL FAR *gethostbyaddr)(const char FAR *addr, - int addrlen, int addrtype); - int (PASCAL FAR *gethostname)(char FAR * name, int namelen); - int (PASCAL FAR *getpeername)(SOCKET sock, struct sockaddr FAR *name, - int FAR *namelen); - struct servent FAR * (PASCAL FAR *getservbyname)(const char FAR * name, - const char FAR * proto); - int (PASCAL FAR *getsockname)(SOCKET sock, struct sockaddr FAR *name, - int FAR *namelen); - int (PASCAL FAR *WSAStartup)(WORD wVersionRequired, LPWSADATA lpWSAData); - int (PASCAL FAR *WSACleanup)(void); - int (PASCAL FAR *WSAGetLastError)(void); - int (PASCAL FAR *WSAAsyncSelect)(SOCKET s, HWND hWnd, u_int wMsg, - long lEvent); - - /* - * The following are used for the WinSock 2.0 for NT implementation - */ - - WSAEVENT (PASCAL FAR *WSACreateEvent)(void); - BOOL (PASCAL FAR *WSACloseEvent)(WSAEVENT event); - int (PASCAL FAR *WSAEventSelect)(SOCKET s, WSAEVENT event, long lEvent); - BOOL (PASCAL FAR *WSAResetEvent)(WSAEVENT event); - BOOL (PASCAL FAR *WSASetEvent)(WSAEVENT event); - int (PASCAL FAR *WSAEnumNetworkEvents)(SOCKET s, WSAEVENT event, - LPWSANETWORKEVENTS events); - DWORD (PASCAL FAR *WSAWaitForMultipleEvents)(DWORD cEvents, - const WSAEVENT FAR *events, - BOOL fWaitAll, DWORD dwTimeOUT, BOOL fAlertable); -} winSock; - -/* - * The following defines declare the messages used on socket windows. - */ - -#define SOCKET_MESSAGE WM_USER+1 - -/* - * The following defines the timeout value for the WSAWaitForMultipleEvents - * in milliseconds. - */ - -#define TCL_SOCKET_EVENT_TIMEOUT 100 - -/* - * 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. Not - * used for the WinSock 2.0 for NT - * implementation. */ - 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. */ - 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 global 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 { - SocketInfo *socketList; /* List of all sockets in the thread */ - - /* - * Data need for the Win95/Win98 implementation: - */ - - HWND hwnd; /* Handle to window for socket messages. */ - - /* - * Data need for the WinNT implementation: - */ - - HANDLE wakeEvent; /* Event to wake up the socket thread */ - Tcl_ThreadId threadId; /* ID of the thread */ - - struct ThreadSpecificData *next; /* Next entry in the thread list */ -} ThreadSpecificData; - -ThreadSpecificData *firstWaitingThread; /* List of threads */ - -static Tcl_ThreadDataKey dataKey; - -/* - * Static functions defined in this file. - */ - -static SocketInfo * CreateSocket _ANSI_ARGS_((Tcl_Interp *interp, - int port, char *host, int server, char *myaddr, - int myport, int async)); -static int CreateSocketAddress _ANSI_ARGS_( - (struct sockaddr_in *sockaddrPtr, - char *host, int port)); -static void InitSockets _ANSI_ARGS_((void)); -static SocketInfo * NewSocketInfo _ANSI_ARGS_((SOCKET socket)); -static void SocketCheckProc _ANSI_ARGS_((ClientData clientData, - int flags)); -static int SocketEventProc _ANSI_ARGS_((Tcl_Event *evPtr, - int flags)); -static void SocketExitHandler _ANSI_ARGS_((ClientData clientData)); -static LRESULT CALLBACK SocketProc _ANSI_ARGS_((HWND hwnd, UINT message, - WPARAM wParam, LPARAM lParam)); -static DWORD WINAPI SocketThread(LPVOID arg); -static void SocketSetupProc _ANSI_ARGS_((ClientData clientData, - int flags)); -static void SocketThreadExitHandler _ANSI_ARGS_((ClientData clientData)); -static int SocketsEnabled _ANSI_ARGS_((void)); -static void TcpAccept _ANSI_ARGS_((SocketInfo *infoPtr)); -static int TcpBlockProc _ANSI_ARGS_((ClientData instanceData, - int mode)); -static int TcpCloseProc _ANSI_ARGS_((ClientData instanceData, - Tcl_Interp *interp)); -static int TcpGetOptionProc _ANSI_ARGS_((ClientData instanceData, - Tcl_Interp *interp, char *optionName, - Tcl_DString *optionValue)); -static int TcpInputProc _ANSI_ARGS_((ClientData instanceData, - char *buf, int toRead, int *errorCode)); -static int TcpOutputProc _ANSI_ARGS_((ClientData instanceData, - char *buf, int toWrite, int *errorCode)); -static void TcpWatchProc _ANSI_ARGS_((ClientData instanceData, - int mask)); -static int TcpGetHandleProc _ANSI_ARGS_((ClientData instanceData, - int direction, ClientData *handlePtr)); -static int WaitForSocketEvent _ANSI_ARGS_((SocketInfo *infoPtr, - int events, int *errorCodePtr)); - -/* - * This structure describes the channel type structure for TCP socket - * based IO. - */ - -static Tcl_ChannelType tcpChannelType = { - "tcp", /* Type name. */ - TcpBlockProc, /* Set socket into blocking/non-blocking mode. */ - TcpCloseProc, /* Close proc. */ - TcpInputProc, /* Input proc. */ - TcpOutputProc, /* Output proc. */ - NULL, /* Seek proc. */ - NULL, /* Set option proc. */ - TcpGetOptionProc, /* Get option proc. */ - TcpWatchProc, /* Initialize notifier to watch this channel. */ - TcpGetHandleProc, /* Get an OS handle from channel. */ -}; - -/* - * Define version of Winsock required by Tcl. - */ - -#define WSA_VERSION_REQD MAKEWORD(1,1) - - -/* - *---------------------------------------------------------------------- - * - * GetSocketState -- - * - * Retrieve the state of a given socket from the winsock API - * using WSAEnumNetWorkEvents. Modify the state appropriately - * when the winsock version is wrong. - * - * Assumes Mutex is held. - * - * Results: - * State of the socket in FD_* masks. - * - * Side effects: - * Modifies the infoPtr values to reflect the current state. - * - *---------------------------------------------------------------------- - */ - -int GetSocketState(SocketInfo *infoPtr) -{ - WSANETWORKEVENTS netEvents; - int event = 0; - - if (!useThreads) { - return infoPtr->readyEvents; - } - - EnterCriticalSection(&socketCS); - if ((*winSock.WSAEnumNetworkEvents)(infoPtr->socket, - socketEvent, &netEvents) == 0) { - - event = netEvents.lNetworkEvents; - - if (event & FD_CLOSE) { - event &= ~(FD_WRITE|FD_ACCEPT); - } - if (event & FD_CONNECT) { - /* - * The socket is now connected, so clear the - * async connect flag. - */ - - infoPtr->flags &= ~(SOCKET_ASYNC_CONNECT); - - } - if(infoPtr->flags & SOCKET_ASYNC_CONNECT) { - infoPtr->flags &= ~(SOCKET_ASYNC_CONNECT); - event |= FD_WRITE; - } - } - LeaveCriticalSection(&socketCS); - - return event; -} - -/* - *---------------------------------------------------------------------- - * - * 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. - * - * 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() -{ - WSADATA wsaData; - DWORD id; - OSVERSIONINFO info; - static WNDCLASSA class; - ThreadSpecificData *tsdPtr = - (ThreadSpecificData *)TclThreadDataKeyGet(&dataKey); - - Tcl_MutexLock(&socketMutex); - if (! initialized) { - - InitializeCriticalSection(&socketCS); - initialized = 1; - Tcl_CreateExitHandler(SocketExitHandler, (ClientData) NULL); - - /* - * Find out if we're running on Win32s. - */ - - info.dwOSVersionInfoSize = sizeof(OSVERSIONINFO); - GetVersionEx(&info); - - /* - * Check to see if Sockets are supported on this system. - * - * For WinNT, use the WinSock 2.0 API to avoid creating extra windows - * to handle socket events. - * - * Not all versions of Win95 have WinSock 2.0, don't count on it being - * there. Also, until someone can get the code to work on Win98 or - * Win95 with WinSock 2.0, use the window-based version for those - * OS's. Major socket users (servers) will probably be on NT anyway. - */ - - if ((info.dwPlatformId == VER_PLATFORM_WIN32_NT)&& - (SearchPathA(NULL, "ws2_32", ".dll", 0, NULL, NULL) != 0) ) { - useThreads = 1; - winSock.hInstance = LoadLibraryA("ws2_32.dll"); - } else if (SearchPathA(NULL, "wsock32", ".dll", 0, NULL, NULL) != 0) { - winSock.hInstance = LoadLibraryA("wsock32.dll"); - } else { - winSock.hInstance = NULL; - } - - /* - * Initialize the function table. - */ - - if (!SocketsEnabled()) { - Tcl_MutexUnlock(&socketMutex); - return; - } - - winSock.accept = (SOCKET (PASCAL FAR *)(SOCKET s, - struct sockaddr FAR *addr, int FAR *addrlen)) - GetProcAddress(winSock.hInstance, "accept"); - winSock.bind = (int (PASCAL FAR *)(SOCKET s, - const struct sockaddr FAR *addr, int namelen)) - GetProcAddress(winSock.hInstance, "bind"); - winSock.closesocket = (int (PASCAL FAR *)(SOCKET s)) - GetProcAddress(winSock.hInstance, "closesocket"); - winSock.connect = (int (PASCAL FAR *)(SOCKET s, - const struct sockaddr FAR *name, int namelen)) - GetProcAddress(winSock.hInstance, "connect"); - winSock.ioctlsocket = (int (PASCAL FAR *)(SOCKET s, long cmd, - u_long FAR *argp)) - GetProcAddress(winSock.hInstance, "ioctlsocket"); - winSock.getsockopt = (int (PASCAL FAR *)(SOCKET s, - int level, int optname, char FAR * optval, int FAR *optlen)) - GetProcAddress(winSock.hInstance, "getsockopt"); - winSock.htons = (u_short (PASCAL FAR *)(u_short hostshort)) - GetProcAddress(winSock.hInstance, "htons"); - winSock.inet_addr = (unsigned long (PASCAL FAR *)(const char FAR *cp)) - GetProcAddress(winSock.hInstance, "inet_addr"); - winSock.inet_ntoa = (char FAR * (PASCAL FAR *)(struct in_addr in)) - GetProcAddress(winSock.hInstance, "inet_ntoa"); - winSock.listen = (int (PASCAL FAR *)(SOCKET s, int backlog)) - GetProcAddress(winSock.hInstance, "listen"); - winSock.ntohs = (u_short (PASCAL FAR *)(u_short netshort)) - GetProcAddress(winSock.hInstance, "ntohs"); - winSock.recv = (int (PASCAL FAR *)(SOCKET s, char FAR * buf, - int len, int flags)) GetProcAddress(winSock.hInstance, "recv"); - winSock.select = (int (PASCAL FAR *)(int nfds, fd_set FAR * readfds, - fd_set FAR * writefds, fd_set FAR * exceptfds, - const struct timeval FAR * tiemout)) - GetProcAddress(winSock.hInstance, "select"); - winSock.send = (int (PASCAL FAR *)(SOCKET s, const char FAR * buf, - int len, int flags)) GetProcAddress(winSock.hInstance, "send"); - winSock.setsockopt = (int (PASCAL FAR *)(SOCKET s, int level, - int optname, const char FAR * optval, int optlen)) - GetProcAddress(winSock.hInstance, "setsockopt"); - winSock.shutdown = (int (PASCAL FAR *)(SOCKET s, int how)) - GetProcAddress(winSock.hInstance, "shutdown"); - winSock.socket = (SOCKET (PASCAL FAR *)(int af, int type, - int protocol)) GetProcAddress(winSock.hInstance, "socket"); - winSock.gethostbyaddr = (struct hostent FAR * (PASCAL FAR *) - (const char FAR *addr, int addrlen, int addrtype)) - GetProcAddress(winSock.hInstance, "gethostbyaddr"); - winSock.gethostbyname = (struct hostent FAR * (PASCAL FAR *) - (const char FAR *name)) - GetProcAddress(winSock.hInstance, "gethostbyname"); - winSock.gethostname = (int (PASCAL FAR *)(char FAR * name, - int namelen)) GetProcAddress(winSock.hInstance, "gethostname"); - winSock.getpeername = (int (PASCAL FAR *)(SOCKET sock, - struct sockaddr FAR *name, int FAR *namelen)) - GetProcAddress(winSock.hInstance, "getpeername"); - winSock.getservbyname = (struct servent FAR * (PASCAL FAR *) - (const char FAR * name, const char FAR * proto)) - GetProcAddress(winSock.hInstance, "getservbyname"); - winSock.getsockname = (int (PASCAL FAR *)(SOCKET sock, - struct sockaddr FAR *name, int FAR *namelen)) - GetProcAddress(winSock.hInstance, "getsockname"); - winSock.WSAStartup = (int (PASCAL FAR *)(WORD wVersionRequired, - LPWSADATA lpWSAData)) GetProcAddress(winSock.hInstance, - "WSAStartup"); - winSock.WSACleanup = (int (PASCAL FAR *)(void)) - GetProcAddress(winSock.hInstance, "WSACleanup"); - winSock.WSAGetLastError = (int (PASCAL FAR *)(void)) - GetProcAddress(winSock.hInstance, "WSAGetLastError"); - winSock.WSAAsyncSelect = (int (PASCAL FAR *)(SOCKET s, HWND hWnd, - u_int wMsg, long lEvent)) - GetProcAddress(winSock.hInstance, "WSAAsyncSelect"); - - if (useThreads) { - winSock.WSACreateEvent = (WSAEVENT (PASCAL FAR *)(void)) - GetProcAddress(winSock.hInstance, "WSACreateEvent"); - winSock.WSACloseEvent = (BOOL (PASCAL FAR *)(WSAEVENT event)) - GetProcAddress(winSock.hInstance, "WSACloseEvent"); - winSock.WSAEventSelect = (int (PASCAL FAR *)(SOCKET s, - WSAEVENT event, - long lEvent)) - GetProcAddress(winSock.hInstance, "WSAEventSelect"); - winSock.WSAResetEvent = (BOOL (PASCAL FAR *)(WSAEVENT event)) - GetProcAddress(winSock.hInstance, "WSAResetEvent"); - winSock.WSASetEvent = (BOOL (PASCAL FAR *)(WSAEVENT event)) - GetProcAddress(winSock.hInstance, "WSASetEvent"); - winSock.WSAEnumNetworkEvents = (int (PASCAL FAR *)(SOCKET s, - WSAEVENT event, - LPWSANETWORKEVENTS events)) - GetProcAddress(winSock.hInstance, "WSAEnumNetworkEvents"); - winSock.WSAWaitForMultipleEvents = - (DWORD (PASCAL FAR *)(DWORD cEvents, - const WSAEVENT FAR *events, - BOOL fWaitAll, DWORD dwTimeOUT, BOOL fAlertable)) - GetProcAddress(winSock.hInstance, "WSAWaitForMultipleEvents"); - } - - /* - * Now check that all fields are properly initialized. If not, return - * zero to indicate that we failed to initialize properly. - */ - - if ((winSock.hInstance == NULL) || - (winSock.accept == NULL) || - (winSock.bind == NULL) || - (winSock.closesocket == NULL) || - (winSock.connect == NULL) || - (winSock.ioctlsocket == NULL) || - (winSock.getsockopt == NULL) || - (winSock.htons == NULL) || - (winSock.inet_addr == NULL) || - (winSock.inet_ntoa == NULL) || - (winSock.listen == NULL) || - (winSock.ntohs == NULL) || - (winSock.recv == NULL) || - (winSock.select == NULL) || - (winSock.send == NULL) || - (winSock.setsockopt == NULL) || - (winSock.socket == NULL) || - (winSock.gethostbyname == NULL) || - (winSock.gethostbyaddr == NULL) || - (winSock.gethostname == NULL) || - (winSock.getpeername == NULL) || - (winSock.getservbyname == NULL) || - (winSock.getsockname == NULL) || - (winSock.WSAStartup == NULL) || - (winSock.WSACleanup == NULL) || - (winSock.WSAGetLastError == NULL) || - (winSock.WSAAsyncSelect == NULL)) { - goto unloadLibrary; - } else if (useThreads && - ((winSock.WSACreateEvent == NULL) || - (winSock.WSACloseEvent == NULL) || - (winSock.WSAGetLastError == NULL) || - (winSock.WSAEventSelect == NULL) || - (winSock.WSAResetEvent == NULL) || - (winSock.WSASetEvent == NULL) || - (winSock.WSAEnumNetworkEvents == NULL) || - (winSock.WSAWaitForMultipleEvents == NULL))) { - /* - * WinSock 2.0 not correctly installed, use 1.x - */ - - useThreads = 0; - } - - /* - * 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. - */ - if (!useThreads) { - class.style = 0; - class.cbClsExtra = 0; - class.cbWndExtra = 0; - class.hInstance = TclWinGetTclInstance(); - class.hbrBackground = NULL; - class.lpszMenuName = NULL; - class.lpszClassName = "TclSocket"; - class.lpfnWndProc = SocketProc; - class.hIcon = NULL; - class.hCursor = NULL; - - if (!RegisterClassA(&class)) { - TclWinConvertError(GetLastError()); - (*winSock.WSACleanup)(); - goto unloadLibrary; - } - } - - /* - * Initialize the winsock library and check the version number. - */ - - if ((*winSock.WSAStartup)(WSA_VERSION_REQD, &wsaData) != 0) { - goto unloadLibrary; - } - if (wsaData.wVersion != WSA_VERSION_REQD) { - (*winSock.WSACleanup)(); - goto unloadLibrary; - } - - if (useThreads) { - socketEvent = (*winSock.WSACreateEvent)(); - killEvent = (*winSock.WSACreateEvent)(); - socketThread = CreateThread(NULL, 8000, SocketThread, - NULL, 0, &id); - SetThreadPriority(socketThread, THREAD_PRIORITY_HIGHEST); - } - } - Tcl_MutexUnlock(&socketMutex); - - /* - * Check for per-thread initialization. - */ - - EnterCriticalSection(&socketCS); - if (tsdPtr == NULL) { - tsdPtr = TCL_TSD_INIT(&dataKey); - tsdPtr->socketList = NULL; - - if (useThreads) { - tsdPtr->wakeEvent = CreateEvent(NULL, FALSE, FALSE, NULL); - - } else { - tsdPtr->hwnd = CreateWindowA("TclSocket", "TclSocket", - WS_TILED, 0, 0, 0, 0, NULL, NULL, class.hInstance, NULL); - if (tsdPtr->hwnd == NULL) { - FreeLibrary(winSock.hInstance); - winSock.hInstance = NULL; - LeaveCriticalSection(&socketCS); - return; - } - } - - Tcl_CreateEventSource(SocketSetupProc, SocketCheckProc, NULL); - Tcl_CreateThreadExitHandler(SocketThreadExitHandler, NULL); - - tsdPtr->threadId = Tcl_GetCurrentThread(); - tsdPtr->next = firstWaitingThread; - firstWaitingThread = tsdPtr; - - } - LeaveCriticalSection(&socketCS); - return; - -unloadLibrary: - FreeLibrary(winSock.hInstance); - winSock.hInstance = NULL; - Tcl_MutexUnlock(&socketMutex); - 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; - EnterCriticalSection(&socketCS); - enabled = (winSock.hInstance != NULL); - LeaveCriticalSection(&socketCS); - return enabled; -} - - -/* - *---------------------------------------------------------------------- - * - * SocketExitHandler -- - * - * Callback invoked during 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. */ -{ - EnterCriticalSection(&socketCS); - if (useThreads && (socketThread != NULL)) { - LeaveCriticalSection(&socketCS); - (*winSock.WSASetEvent)(killEvent); - WaitForSingleObject(socketThread, INFINITE); - EnterCriticalSection(&socketCS); - CloseHandle(socketThread); - (*winSock.WSACloseEvent)(killEvent); - (*winSock.WSACloseEvent)(socketEvent); - } - if (winSock.hInstance) { - if (!useThreads) { - UnregisterClassA("TclSocket", TclWinGetTclInstance()); - } - (*winSock.WSACleanup)(); - FreeLibrary(winSock.hInstance); - winSock.hInstance = NULL; - } - initialized = 0; - hostnameInitialized = 0; - LeaveCriticalSection(&socketCS); -} - -/* - *---------------------------------------------------------------------- - * - * SocketThreadExitHandler -- - * - * Callback invoked during thread clean up to delete the socket - * event source. - * - * Results: - * None. - * - * Side effects: - * Delete the event source. - * - *---------------------------------------------------------------------- - */ - - /* ARGSUSED */ -static void -SocketThreadExitHandler(clientData) - ClientData clientData; /* Not used. */ -{ - ThreadSpecificData *tsdPtr, *nextPtr; - - tsdPtr = (ThreadSpecificData *)TclThreadDataKeyGet(&dataKey); - - if (useThreads) { - EnterCriticalSection(&socketCS); - CloseHandle(tsdPtr->wakeEvent); - - if (firstWaitingThread == tsdPtr) { - firstWaitingThread = tsdPtr->next; - } else { - for (nextPtr = firstWaitingThread; - nextPtr != NULL; - nextPtr = nextPtr->next) { - - if (nextPtr->next == tsdPtr) { - nextPtr->next = tsdPtr->next; - break; - } - } - } - LeaveCriticalSection(&socketCS); - } else { - DestroyWindow(tsdPtr->hwnd); - } - - 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: - * None. - * - *---------------------------------------------------------------------- - */ - -int -TclpHasSockets(interp) - Tcl_Interp *interp; -{ - InitSockets(); - - 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); - int readyEvents; - - if (!(flags & TCL_FILE_EVENTS)) { - return; - } - - /* - * Check to see if there is a ready socket. If so, poll. - */ - - EnterCriticalSection(&socketCS); - for (infoPtr = tsdPtr->socketList; infoPtr != NULL; - infoPtr = infoPtr->nextPtr) { - readyEvents = GetSocketState(infoPtr); - if (readyEvents & infoPtr->watchEvents) { - Tcl_SetMaxBlockTime(&blockTime); - break; - } - } - LeaveCriticalSection(&socketCS); -} - -/* - *---------------------------------------------------------------------- - * - * 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. */ -{ - int readyEvents; - 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). - */ - - EnterCriticalSection(&socketCS); - for (infoPtr = tsdPtr->socketList; infoPtr != NULL; - infoPtr = infoPtr->nextPtr) { - readyEvents = GetSocketState(infoPtr); - if ((readyEvents & infoPtr->watchEvents) - && !(infoPtr->flags & SOCKET_PENDING)) { - infoPtr->flags |= SOCKET_PENDING; - evPtr = (SocketEvent *) ckalloc(sizeof(SocketEvent)); - evPtr->header.proc = SocketEventProc; - evPtr->socket = infoPtr->socket; - LeaveCriticalSection(&socketCS); - Tcl_QueueEvent((Tcl_Event *) evPtr, TCL_QUEUE_TAIL); - EnterCriticalSection(&socketCS); - } - } - LeaveCriticalSection(&socketCS); -} - -/* - *---------------------------------------------------------------------- - * - * 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; - int readyEvents; - ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey); - - if (!(flags & TCL_FILE_EVENTS)) { - return 0; - } - - /* - * Find the specified socket on the socket list. - */ - - EnterCriticalSection(&socketCS); - for (infoPtr = tsdPtr->socketList; infoPtr != NULL; - infoPtr = infoPtr->nextPtr) { - if (infoPtr->socket == eventPtr->socket) { - break; - } - } - LeaveCriticalSection(&socketCS); - - /* - * Discard events that have gone stale. - */ - - if (!infoPtr) { - return 1; - } - - infoPtr->flags &= ~SOCKET_PENDING; - - /* - * Handle connection requests directly. - */ - - readyEvents = GetSocketState(infoPtr); - if (readyEvents & FD_ACCEPT) { - TcpAccept(infoPtr); - return 1; - } - - - /* - * Mask off unwanted events and compute the read/write mask so - * we can notify the channel. - */ - - events = 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; - } 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. - */ - - if (!useThreads) { - (void) (*winSock.WSAAsyncSelect)(infoPtr->socket, - tsdPtr->hwnd, 0, 0); - } - - 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 if (!useThreads) { - (void) (*winSock.WSAAsyncSelect)(infoPtr->socket, tsdPtr->hwnd, - SOCKET_MESSAGE, infoPtr->selectEvents); - } - infoPtr->readyEvents &= ~(FD_READ); - } - if (events & (FD_WRITE | FD_CONNECT)) { - mask |= TCL_WRITABLE; - } - - 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; - SocketInfo **nextPtrPtr; - 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((*winSock.WSAGetLastError)()); - errorCode = Tcl_GetErrno(); - } - } - - /* - * Remove the socket from socketList. - */ - - EnterCriticalSection(&socketCS); - for (nextPtrPtr = &(tsdPtr->socketList); (*nextPtrPtr) != NULL; - nextPtrPtr = &((*nextPtrPtr)->nextPtr)) { - if ((*nextPtrPtr) == infoPtr) { - (*nextPtrPtr) = infoPtr->nextPtr; - break; - } - } - LeaveCriticalSection(&socketCS); - - ckfree((char *) infoPtr); - return errorCode; -} - -/* - *---------------------------------------------------------------------- - * - * NewSocketInfo -- - * - * This function allocates and initializes a new SocketInfo - * structure. - * - * Results: - * Returns a newly allocated SocketInfo. - * - * Side effects: - * Adds the socket to the global socket list. - * - *---------------------------------------------------------------------- - */ - -static SocketInfo * -NewSocketInfo(socket) - SOCKET socket; -{ - SocketInfo *infoPtr; - ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey); - - infoPtr = (SocketInfo *) ckalloc((unsigned) sizeof(SocketInfo)); - infoPtr->socket = socket; - infoPtr->flags = 0; - infoPtr->watchEvents = 0; - infoPtr->readyEvents = 0; - infoPtr->selectEvents = 0; - infoPtr->acceptProc = NULL; - infoPtr->lastError = 0; - - EnterCriticalSection(&socketCS); - infoPtr->nextPtr = tsdPtr->socketList; - tsdPtr->socketList = infoPtr; - LeaveCriticalSection(&socketCS); - - 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: - * Adds a new socket to the socketList. - * - *---------------------------------------------------------------------- - */ - -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. */ - 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. */ - 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. */ - struct sockaddr_in sockaddr; /* Socket address */ - struct sockaddr_in mysockaddr; /* Socket address for client */ - SOCKET sock; - 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(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, (struct sockaddr *) &sockaddr, - sizeof(sockaddr)) == 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. - */ - - EnterCriticalSection(&socketCS); - infoPtr->selectEvents = FD_ACCEPT; - infoPtr->watchEvents |= FD_ACCEPT; - LeaveCriticalSection(&socketCS); - - } else { - - /* - * Try to bind to a local port, if specified. - */ - - if (myaddr != NULL || myport != 0) { - if ((*winSock.bind)(sock, (struct sockaddr *) &mysockaddr, - sizeof(struct sockaddr)) == 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, FIONBIO, &flag) == SOCKET_ERROR) { - goto error; - } - } - - /* - * Attempt to connect to the remote socket. - */ - - if ((*winSock.connect)(sock, (struct sockaddr *) &sockaddr, - sizeof(sockaddr)) == SOCKET_ERROR) { - TclWinConvertWSAError((*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. - */ - - EnterCriticalSection(&socketCS); - infoPtr->selectEvents = FD_READ | FD_WRITE | FD_CLOSE; - if (asyncConnect) { - infoPtr->flags |= SOCKET_ASYNC_CONNECT; - infoPtr->selectEvents |= FD_CONNECT; - } - LeaveCriticalSection(&socketCS); - } - - /* - * Register for interest in events in the select mask. Note that this - * automatically places the socket into non-blocking mode. - */ - - if (useThreads) { - (void) (*winSock.WSAEventSelect)(infoPtr->socket, socketEvent, - infoPtr->selectEvents); - } else { - (*winSock.ioctlsocket)(sock, FIONBIO, &flag); - (void) (*winSock.WSAAsyncSelect)(infoPtr->socket, tsdPtr->hwnd, - SOCKET_MESSAGE, infoPtr->selectEvents); - } - - return infoPtr; - -error: - TclWinConvertWSAError((*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) - struct sockaddr_in *sockaddrPtr; /* Socket address */ - 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; - } - - (void) memset((char *) sockaddrPtr, '\0', sizeof(struct sockaddr_in)); - sockaddrPtr->sin_family = AF_INET; - sockaddrPtr->sin_port = (*winSock.htons)((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((char *) &addr, - (char *) hostent->h_addr_list[0], - (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? */ -{ - MSG msg; - int readyEvents; - 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); - - if (useThreads) { - - while (1) { - readyEvents = GetSocketState(infoPtr); - if (infoPtr->lastError) { - *errorCodePtr = infoPtr->lastError; - result = 0; - break; - } else if (readyEvents & events) { - break; - } else if (infoPtr->flags & SOCKET_ASYNC) { - *errorCodePtr = EWOULDBLOCK; - result = 0; - break; - } - WaitForSingleObject(tsdPtr->wakeEvent, 100); -// Tcl_ServiceAll(); - } - } else { - - /* - * Reset WSAAsyncSelect so we have a fresh set of events pending. - */ - - (void) (*winSock.WSAAsyncSelect)(infoPtr->socket, tsdPtr->hwnd, 0, 0); - (void) (*winSock.WSAAsyncSelect)(infoPtr->socket, tsdPtr->hwnd, - SOCKET_MESSAGE, infoPtr->selectEvents); - - while (1) { - /* - * Process all outstanding messages on the socket window. - */ - - while (PeekMessage(&msg, tsdPtr->hwnd, 0, 0, PM_REMOVE)) { - DispatchMessage(&msg); - } - - 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. - */ - - WaitMessage(); - } - } - (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. */ - char *host; /* Host on which to open port. */ - 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 = - (ThreadSpecificData *)TclThreadDataKeyGet(&dataKey); - - if (TclpHasSockets(NULL) != TCL_OK) { - return NULL; - } - - /* - * Set kernel space buffering and non-blocking. - */ - - TclSockMinimumBuffers((SOCKET) sock, TCP_BUFFER_SIZE); - - infoPtr = NewSocketInfo((SOCKET) sock); - - if (infoPtr == NULL) { - return NULL; - } - - /* - * Start watching for read/write events on the socket. - */ - - infoPtr->selectEvents = FD_READ | FD_CLOSE | FD_WRITE; - - if (useThreads) { - (void) (*winSock.WSAEventSelect)(infoPtr->socket, socketEvent, - infoPtr->selectEvents); - } else { - (void) (*winSock.WSAAsyncSelect)(infoPtr->socket, tsdPtr->hwnd, - SOCKET_MESSAGE, infoPtr->selectEvents); - } - - 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. */ - 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; - struct sockaddr_in addr; - int len; - char channelName[16 + TCL_INTEGER_SPACE]; - ThreadSpecificData *tsdPtr = - (ThreadSpecificData *)TclThreadDataKeyGet(&dataKey); - - /* - * Accept the incoming connection request. - */ - - len = sizeof(struct sockaddr_in); - newSocket = (*winSock.accept)(infoPtr->socket, (struct 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. - */ - - infoPtr->readyEvents &= ~(FD_ACCEPT); - - if (newSocket == INVALID_SOCKET) { - return; - } - - /* - * 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); - if (useThreads) { - (void) (*winSock.WSAEventSelect)(newInfoPtr->socket, socketEvent, - newInfoPtr->selectEvents); - } else { - (void) (*winSock.WSAAsyncSelect)(newInfoPtr->socket, tsdPtr->hwnd, - SOCKET_MESSAGE, newInfoPtr->selectEvents); - } - - 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; - int error; - int readyEvents; - 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. - */ - infoPtr->selectEvents |= FD_READ | FD_CLOSE; - - if (useThreads) { - (void) (*winSock.WSAEventSelect)(infoPtr->socket, socketEvent, - infoPtr->selectEvents); - } - - 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) { - - if (!useThreads) { - (void) (*winSock.WSAAsyncSelect)(infoPtr->socket, tsdPtr->hwnd, - 0, 0); - } - 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. - */ - readyEvents = GetSocketState(infoPtr); - - if (readyEvents & FD_CLOSE) { - infoPtr->flags |= SOCKET_EOF; - bytesRead = 0; - break; - } - - /* - * Check for error condition or underflow in non-blocking case. - */ - - error = (*winSock.WSAGetLastError)(); - if ((error != 0) && ((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; - } - } - - if (!useThreads) { - (void) (*winSock.WSAAsyncSelect)(infoPtr->socket, tsdPtr->hwnd, - SOCKET_MESSAGE, infoPtr->selectEvents); - } - 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. */ - 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; - int 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) { - if (!useThreads) { - (void) (*winSock.WSAAsyncSelect)(infoPtr->socket, tsdPtr->hwnd, - 0, 0); - } - - bytesWritten = (*winSock.send)(infoPtr->socket, buf, toWrite, 0); - if (bytesWritten != SOCKET_ERROR) { - if (!useThreads && (infoPtr->watchEvents & FD_WRITE)) { - /* - * 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. - */ - - 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; - } - } - - if (!useThreads) { - (void) (*winSock.WSAAsyncSelect)(infoPtr->socket, tsdPtr->hwnd, - SOCKET_MESSAGE, infoPtr->selectEvents); - } - return bytesWritten; -} - -/* - *---------------------------------------------------------------------- - * - * 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 */ - 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; - struct sockaddr_in sockname; - struct sockaddr_in peername; - struct hostent *hostEntPtr; - SOCKET sock; - int size = sizeof(struct 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; - int err, 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, (struct sockaddr *) &peername, &size) - == 0) { - if (len == 0) { - Tcl_DStringAppendElement(dsPtr, "-peername"); - Tcl_DStringStartSublist(dsPtr); - } - Tcl_DStringAppendElement(dsPtr, - (*winSock.inet_ntoa)(peername.sin_addr)); - 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((*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, (struct sockaddr *) &sockname, &size) - == 0) { - if (len == 0) { - Tcl_DStringAppendElement(dsPtr, "-sockname"); - Tcl_DStringStartSublist(dsPtr); - } - Tcl_DStringAppendElement(dsPtr, - (*winSock.inet_ntoa)(sockname.sin_addr)); - 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((*winSock.WSAGetLastError)()); - Tcl_AppendResult(interp, "can't get sockname: ", - Tcl_PosixError(interp), - (char *) NULL); - } - return TCL_ERROR; - } - } - - if (len > 0) { - 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. */ -{ - int readyEvents; - SocketInfo *infoPtr = (SocketInfo *) instanceData; - - /* - * Update the watch events mask. - */ - - EnterCriticalSection(&socketCS); - infoPtr->watchEvents = 0; - if (mask & TCL_READABLE) { - infoPtr->watchEvents |= (FD_READ|FD_CLOSE|FD_ACCEPT); - } - if (mask & TCL_WRITABLE) { - infoPtr->watchEvents |= (FD_WRITE|FD_CONNECT); - } - LeaveCriticalSection(&socketCS); - - /* - * If there are any conditions already set, then tell the notifier to poll - * rather than block. - */ - - readyEvents = GetSocketState(infoPtr); - if (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 -- - * - * Use a separate thread to check state for the sockets in each - * thread. Using a window isn't the best way, especially if the - * WinSock2 API is available and working. Also, creating N threads - * per socket like the pipe, console, and serial drivers isn't - * very efficient. Currently, all sockets are tied to one event. - * The overhead involved in creating an event for each socket is - * a concern. But, in order to avoid deadlocks, the call to - * WSAWaitForMultipleEvents() needs to timeout to check for - * status changes which haven't been handled (race condition). - * - * Results: - * 0 on success. - * - * Side effects: - * - *---------------------------------------------------------------------- - */ - -static DWORD WINAPI -SocketThread(LPVOID arg) -{ - SocketInfo *infoPtr; - WSAEVENT events[2]; - ThreadSpecificData *tsdPtr; - DWORD result; - - /* - * Find the specified socket on the socket list and update its - * eventState flag. - */ - - events[0] = killEvent; - events[1] = socketEvent; - - while (1) { - - result = (*winSock.WSAWaitForMultipleEvents)(2, events, FALSE, - TCL_SOCKET_EVENT_TIMEOUT, FALSE); - - switch (result) { - case WSA_WAIT_TIMEOUT: - case (WSA_WAIT_EVENT_0 +1): - - /* - * A socket event has fired, determine which socket(s) it was - * and which thread(s) it came from. - */ - - EnterCriticalSection(&socketCS); - for (tsdPtr = firstWaitingThread; tsdPtr != NULL; - tsdPtr = tsdPtr->next) { - - for (infoPtr = tsdPtr->socketList; infoPtr != NULL; - infoPtr = infoPtr->nextPtr) { - - if (GetSocketState(infoPtr) & infoPtr->watchEvents) { - Tcl_ThreadAlert(tsdPtr->threadId); - SetEvent(tsdPtr->wakeEvent); - } - } - } - LeaveCriticalSection(&socketCS); - (*winSock.WSAResetEvent)(socketEvent); - break; - - case WSA_WAIT_EVENT_0: - /* - * This thread is supposed to kill itself off - */ - - return 0; - break; - - default: - /* - * The thread has detected a fatal error - */ - - return 1; - break; - } - } - - return 0; -} - -/* - *---------------------------------------------------------------------- - * - * 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 = TCL_TSD_INIT(&dataKey); - - if (message != SOCKET_MESSAGE) { - return DefWindowProc(hwnd, message, wParam, lParam); - } - - event = WSAGETSELECTEVENT(lParam); - error = WSAGETSELECTERROR(lParam); - socket = (SOCKET) wParam; - - /* - * Find the specified socket on the socket list and update its - * eventState flag. - */ - - for (infoPtr = tsdPtr->socketList; infoPtr != NULL; - infoPtr = infoPtr->nextPtr) { - if (infoPtr->socket == socket) { - /* - * Update the socket state. - */ - - if (event & FD_CLOSE) { - infoPtr->readyEvents &= ~(FD_WRITE|FD_ACCEPT); - } - if (event & FD_CONNECT) { - /* - * The socket is now connected, so 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(error); - infoPtr->lastError = Tcl_GetErrno(); - } - - } - if(infoPtr->flags & SOCKET_ASYNC_CONNECT) { - infoPtr->flags &= ~(SOCKET_ASYNC_CONNECT); - if (error != ERROR_SUCCESS) { - TclWinConvertWSAError(error); - infoPtr->lastError = Tcl_GetErrno(); - } - infoPtr->readyEvents |= FD_WRITE; - } - infoPtr->readyEvents |= event; - break; - } - } - - /* - * Flush the Tcl event queue before returning to the event loop. - */ - - Tcl_ServiceAll(); - - 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. - * - *---------------------------------------------------------------------- - */ - -char * -Tcl_GetHostName() -{ - DWORD length; - WCHAR wbuf[MAX_COMPUTERNAME_LENGTH + 1]; - - Tcl_MutexLock(&socketMutex); - if (hostnameInitialized) { - Tcl_MutexUnlock(&socketMutex); - return hostname; - } - - if (TclpHasSockets(NULL) == TCL_OK) { - /* - * INTL: bug - */ - - if ((*winSock.gethostname)(hostname, sizeof(hostname)) == 0) { - hostnameInitialized = 1; - Tcl_MutexUnlock(&socketMutex); - return hostname; - } - } - 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); -} +/* + * 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 1.11 1999/06/08 19:02:15 stanton Exp $ + */ + +#include "tclWinInt.h" + +/* + * 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) + +/* + * 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 Winsock.dll on demand, we must use this function table + * to refer to functions in the socket API. + */ + +static struct { + HINSTANCE hInstance; /* Handle to WinSock library. */ + SOCKET (PASCAL FAR *accept)(SOCKET s, struct sockaddr FAR *addr, + int FAR *addrlen); + int (PASCAL FAR *bind)(SOCKET s, const struct sockaddr FAR *addr, + int namelen); + int (PASCAL FAR *closesocket)(SOCKET s); + int (PASCAL FAR *connect)(SOCKET s, const struct sockaddr FAR *name, + int namelen); + int (PASCAL FAR *ioctlsocket)(SOCKET s, long cmd, u_long FAR *argp); + int (PASCAL FAR *getsockopt)(SOCKET s, int level, int optname, + char FAR * optval, int FAR *optlen); + u_short (PASCAL FAR *htons)(u_short hostshort); + unsigned long (PASCAL FAR *inet_addr)(const char FAR * cp); + char FAR * (PASCAL FAR *inet_ntoa)(struct in_addr in); + int (PASCAL FAR *listen)(SOCKET s, int backlog); + u_short (PASCAL FAR *ntohs)(u_short netshort); + int (PASCAL FAR *recv)(SOCKET s, char FAR * buf, int len, int flags); + int (PASCAL FAR *select)(int nfds, fd_set FAR * readfds, + fd_set FAR * writefds, fd_set FAR * exceptfds, + const struct timeval FAR * tiemout); + int (PASCAL FAR *send)(SOCKET s, const char FAR * buf, int len, int flags); + int (PASCAL FAR *setsockopt)(SOCKET s, int level, int optname, + const char FAR * optval, int optlen); + int (PASCAL FAR *shutdown)(SOCKET s, int how); + SOCKET (PASCAL FAR *socket)(int af, int type, int protocol); + struct hostent FAR * (PASCAL FAR *gethostbyname)(const char FAR * name); + struct hostent FAR * (PASCAL FAR *gethostbyaddr)(const char FAR *addr, + int addrlen, int addrtype); + int (PASCAL FAR *gethostname)(char FAR * name, int namelen); + int (PASCAL FAR *getpeername)(SOCKET sock, struct sockaddr FAR *name, + int FAR *namelen); + struct servent FAR * (PASCAL FAR *getservbyname)(const char FAR * name, + const char FAR * proto); + int (PASCAL FAR *getsockname)(SOCKET sock, struct sockaddr FAR *name, + int FAR *namelen); + int (PASCAL FAR *WSAStartup)(WORD wVersionRequired, LPWSADATA lpWSAData); + int (PASCAL FAR *WSACleanup)(void); + int (PASCAL FAR *WSAGetLastError)(void); + int (PASCAL FAR *WSAAsyncSelect)(SOCKET s, HWND hWnd, u_int wMsg, + long lEvent); +} winSock; + +/* + * The following defines declare the messages used on socket windows. + */ + +#define SOCKET_MESSAGE WM_USER+1 + +/* + * 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. */ + 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 global 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 { + /* + * Every open socket has an entry on the following list. + */ + + HWND hwnd; /* Handle to window for socket messages. */ + SocketInfo *socketList; +} ThreadSpecificData; + +static Tcl_ThreadDataKey dataKey; + +/* + * Static functions defined in this file. + */ + +static SocketInfo * CreateSocket _ANSI_ARGS_((Tcl_Interp *interp, + int port, char *host, int server, char *myaddr, + int myport, int async)); +static int CreateSocketAddress _ANSI_ARGS_( + (struct sockaddr_in *sockaddrPtr, + char *host, int port)); +static void InitSockets _ANSI_ARGS_((void)); +static SocketInfo * NewSocketInfo _ANSI_ARGS_((SOCKET socket)); +static void SocketCheckProc _ANSI_ARGS_((ClientData clientData, + int flags)); +static int SocketEventProc _ANSI_ARGS_((Tcl_Event *evPtr, + int flags)); +static void SocketExitHandler _ANSI_ARGS_((ClientData clientData)); +static LRESULT CALLBACK SocketProc _ANSI_ARGS_((HWND hwnd, UINT message, + WPARAM wParam, LPARAM lParam)); +static void SocketSetupProc _ANSI_ARGS_((ClientData clientData, + int flags)); +static void SocketThreadExitHandler _ANSI_ARGS_((ClientData clientData)); +static int SocketsEnabled _ANSI_ARGS_((void)); +static void TcpAccept _ANSI_ARGS_((SocketInfo *infoPtr)); +static int TcpBlockProc _ANSI_ARGS_((ClientData instanceData, + int mode)); +static int TcpCloseProc _ANSI_ARGS_((ClientData instanceData, + Tcl_Interp *interp)); +static int TcpGetOptionProc _ANSI_ARGS_((ClientData instanceData, + Tcl_Interp *interp, char *optionName, + Tcl_DString *optionValue)); +static int TcpInputProc _ANSI_ARGS_((ClientData instanceData, + char *buf, int toRead, int *errorCode)); +static int TcpOutputProc _ANSI_ARGS_((ClientData instanceData, + char *buf, int toWrite, int *errorCode)); +static void TcpWatchProc _ANSI_ARGS_((ClientData instanceData, + int mask)); +static int TcpGetHandleProc _ANSI_ARGS_((ClientData instanceData, + int direction, ClientData *handlePtr)); +static int WaitForSocketEvent _ANSI_ARGS_((SocketInfo *infoPtr, + int events, int *errorCodePtr)); + +/* + * This structure describes the channel type structure for TCP socket + * based IO. + */ + +static Tcl_ChannelType tcpChannelType = { + "tcp", /* Type name. */ + TcpBlockProc, /* Set socket into blocking/non-blocking mode. */ + TcpCloseProc, /* Close proc. */ + TcpInputProc, /* Input proc. */ + TcpOutputProc, /* Output proc. */ + NULL, /* Seek proc. */ + NULL, /* Set option proc. */ + TcpGetOptionProc, /* Get option proc. */ + TcpWatchProc, /* Initialize notifier to watch this channel. */ + TcpGetHandleProc, /* Get an OS handle from channel. */ +}; + +/* + * Define version of Winsock required by Tcl. + */ + +#define WSA_VERSION_REQD MAKEWORD(1,1) + +/* + *---------------------------------------------------------------------- + * + * 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 Mutex 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() +{ + WSADATA wsaData; + OSVERSIONINFO info; + static WNDCLASSA class; + ThreadSpecificData *tsdPtr = + (ThreadSpecificData *)TclThreadDataKeyGet(&dataKey); + + if (! initialized) { + initialized = 1; + Tcl_CreateExitHandler(SocketExitHandler, (ClientData) NULL); + + /* + * Find out if we're running on Win32s. + */ + + info.dwOSVersionInfoSize = sizeof(OSVERSIONINFO); + GetVersionEx(&info); + + /* + * Check to see if Sockets are supported on this system. Since + * win32s panics if we call WSAStartup on a system that doesn't + * have winsock.dll, we need to look for it on the system first. + * If we find winsock, then load the library and initialize the + * stub table. + */ + + if ((info.dwPlatformId != VER_PLATFORM_WIN32s) + || (SearchPathA(NULL, "WINSOCK", ".DLL", 0, NULL, NULL) != 0)) { + winSock.hInstance = LoadLibraryA("wsock32.dll"); + } else { + winSock.hInstance = NULL; + } + + /* + * Initialize the function table. + */ + + if (!SocketsEnabled()) { + return; + } + + winSock.accept = (SOCKET (PASCAL FAR *)(SOCKET s, + struct sockaddr FAR *addr, int FAR *addrlen)) + GetProcAddress(winSock.hInstance, "accept"); + winSock.bind = (int (PASCAL FAR *)(SOCKET s, + const struct sockaddr FAR *addr, int namelen)) + GetProcAddress(winSock.hInstance, "bind"); + winSock.closesocket = (int (PASCAL FAR *)(SOCKET s)) + GetProcAddress(winSock.hInstance, "closesocket"); + winSock.connect = (int (PASCAL FAR *)(SOCKET s, + const struct sockaddr FAR *name, int namelen)) + GetProcAddress(winSock.hInstance, "connect"); + winSock.ioctlsocket = (int (PASCAL FAR *)(SOCKET s, long cmd, + u_long FAR *argp)) + GetProcAddress(winSock.hInstance, "ioctlsocket"); + winSock.getsockopt = (int (PASCAL FAR *)(SOCKET s, + int level, int optname, char FAR * optval, int FAR *optlen)) + GetProcAddress(winSock.hInstance, "getsockopt"); + winSock.htons = (u_short (PASCAL FAR *)(u_short hostshort)) + GetProcAddress(winSock.hInstance, "htons"); + winSock.inet_addr = (unsigned long (PASCAL FAR *)(const char FAR *cp)) + GetProcAddress(winSock.hInstance, "inet_addr"); + winSock.inet_ntoa = (char FAR * (PASCAL FAR *)(struct in_addr in)) + GetProcAddress(winSock.hInstance, "inet_ntoa"); + winSock.listen = (int (PASCAL FAR *)(SOCKET s, int backlog)) + GetProcAddress(winSock.hInstance, "listen"); + winSock.ntohs = (u_short (PASCAL FAR *)(u_short netshort)) + GetProcAddress(winSock.hInstance, "ntohs"); + winSock.recv = (int (PASCAL FAR *)(SOCKET s, char FAR * buf, + int len, int flags)) GetProcAddress(winSock.hInstance, "recv"); + winSock.select = (int (PASCAL FAR *)(int nfds, fd_set FAR * readfds, + fd_set FAR * writefds, fd_set FAR * exceptfds, + const struct timeval FAR * tiemout)) + GetProcAddress(winSock.hInstance, "select"); + winSock.send = (int (PASCAL FAR *)(SOCKET s, const char FAR * buf, + int len, int flags)) GetProcAddress(winSock.hInstance, "send"); + winSock.setsockopt = (int (PASCAL FAR *)(SOCKET s, int level, + int optname, const char FAR * optval, int optlen)) + GetProcAddress(winSock.hInstance, "setsockopt"); + winSock.shutdown = (int (PASCAL FAR *)(SOCKET s, int how)) + GetProcAddress(winSock.hInstance, "shutdown"); + winSock.socket = (SOCKET (PASCAL FAR *)(int af, int type, + int protocol)) GetProcAddress(winSock.hInstance, "socket"); + winSock.gethostbyaddr = (struct hostent FAR * (PASCAL FAR *) + (const char FAR *addr, int addrlen, int addrtype)) + GetProcAddress(winSock.hInstance, "gethostbyaddr"); + winSock.gethostbyname = (struct hostent FAR * (PASCAL FAR *) + (const char FAR *name)) + GetProcAddress(winSock.hInstance, "gethostbyname"); + winSock.gethostname = (int (PASCAL FAR *)(char FAR * name, + int namelen)) GetProcAddress(winSock.hInstance, "gethostname"); + winSock.getpeername = (int (PASCAL FAR *)(SOCKET sock, + struct sockaddr FAR *name, int FAR *namelen)) + GetProcAddress(winSock.hInstance, "getpeername"); + winSock.getservbyname = (struct servent FAR * (PASCAL FAR *) + (const char FAR * name, const char FAR * proto)) + GetProcAddress(winSock.hInstance, "getservbyname"); + winSock.getsockname = (int (PASCAL FAR *)(SOCKET sock, + struct sockaddr FAR *name, int FAR *namelen)) + GetProcAddress(winSock.hInstance, "getsockname"); + winSock.WSAStartup = (int (PASCAL FAR *)(WORD wVersionRequired, + LPWSADATA lpWSAData)) GetProcAddress(winSock.hInstance, "WSAStartup"); + winSock.WSACleanup = (int (PASCAL FAR *)(void)) + GetProcAddress(winSock.hInstance, "WSACleanup"); + winSock.WSAGetLastError = (int (PASCAL FAR *)(void)) + GetProcAddress(winSock.hInstance, "WSAGetLastError"); + winSock.WSAAsyncSelect = (int (PASCAL FAR *)(SOCKET s, HWND hWnd, + u_int wMsg, long lEvent)) + GetProcAddress(winSock.hInstance, "WSAAsyncSelect"); + + /* + * Now check that all fields are properly initialized. If not, return + * zero to indicate that we failed to initialize properly. + */ + + if ((winSock.hInstance == NULL) || + (winSock.accept == NULL) || + (winSock.bind == NULL) || + (winSock.closesocket == NULL) || + (winSock.connect == NULL) || + (winSock.ioctlsocket == NULL) || + (winSock.getsockopt == NULL) || + (winSock.htons == NULL) || + (winSock.inet_addr == NULL) || + (winSock.inet_ntoa == NULL) || + (winSock.listen == NULL) || + (winSock.ntohs == NULL) || + (winSock.recv == NULL) || + (winSock.select == NULL) || + (winSock.send == NULL) || + (winSock.setsockopt == NULL) || + (winSock.socket == NULL) || + (winSock.gethostbyname == NULL) || + (winSock.gethostbyaddr == NULL) || + (winSock.gethostname == NULL) || + (winSock.getpeername == NULL) || + (winSock.getservbyname == NULL) || + (winSock.getsockname == NULL) || + (winSock.WSAStartup == NULL) || + (winSock.WSACleanup == NULL) || + (winSock.WSAGetLastError == NULL) || + (winSock.WSAAsyncSelect == 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. + */ + + class.style = 0; + class.cbClsExtra = 0; + class.cbWndExtra = 0; + class.hInstance = TclWinGetTclInstance(); + class.hbrBackground = NULL; + class.lpszMenuName = NULL; + class.lpszClassName = "TclSocket"; + class.lpfnWndProc = SocketProc; + class.hIcon = NULL; + class.hCursor = NULL; + + if (!RegisterClassA(&class)) { + TclWinConvertError(GetLastError()); + (*winSock.WSACleanup)(); + goto unloadLibrary; + } + + /* + * Initialize the winsock library and check the version number. + */ + + if ((*winSock.WSAStartup)(WSA_VERSION_REQD, &wsaData) != 0) { + goto unloadLibrary; + } + if (wsaData.wVersion != WSA_VERSION_REQD) { + (*winSock.WSACleanup)(); + goto unloadLibrary; + } + } + + /* + * Check for per-thread initialization. + */ + + if (tsdPtr == NULL) { + tsdPtr = TCL_TSD_INIT(&dataKey); + tsdPtr->socketList = NULL; + + tsdPtr->hwnd = CreateWindowA("TclSocket", "TclSocket", + WS_TILED, 0, 0, 0, 0, NULL, NULL, class.hInstance, NULL); + + if (tsdPtr->hwnd == NULL) { + goto unloadLibrary; + } + + Tcl_CreateEventSource(SocketSetupProc, SocketCheckProc, NULL); + Tcl_CreateThreadExitHandler(SocketThreadExitHandler, NULL); + } + return; + +unloadLibrary: + FreeLibrary(winSock.hInstance); + winSock.hInstance = 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.hInstance != NULL); + Tcl_MutexUnlock(&socketMutex); + return enabled; +} + + +/* + *---------------------------------------------------------------------- + * + * SocketExitHandler -- + * + * Callback invoked during 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.hInstance) { + UnregisterClassA("TclSocket", TclWinGetTclInstance()); + (*winSock.WSACleanup)(); + FreeLibrary(winSock.hInstance); + winSock.hInstance = NULL; + } + initialized = 0; + hostnameInitialized = 0; + Tcl_MutexUnlock(&socketMutex); +} + +/* + *---------------------------------------------------------------------- + * + * SocketThreadExitHandler -- + * + * Callback invoked during thread clean up to delete the socket + * event source. + * + * Results: + * None. + * + * Side effects: + * Delete the event source. + * + *---------------------------------------------------------------------- + */ + + /* ARGSUSED */ +static void +SocketThreadExitHandler(clientData) + ClientData clientData; /* Not used. */ +{ + ThreadSpecificData *tsdPtr = + (ThreadSpecificData *)TclThreadDataKeyGet(&dataKey); + + DestroyWindow(tsdPtr->hwnd); + + 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: + * None. + * + *---------------------------------------------------------------------- + */ + +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. + */ + + for (infoPtr = tsdPtr->socketList; infoPtr != NULL; + infoPtr = infoPtr->nextPtr) { + if (infoPtr->readyEvents & infoPtr->watchEvents) { + Tcl_SetMaxBlockTime(&blockTime); + break; + } + } +} + +/* + *---------------------------------------------------------------------- + * + * 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). + */ + + 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); + } + } +} + +/* + *---------------------------------------------------------------------- + * + * 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. + */ + + for (infoPtr = tsdPtr->socketList; infoPtr != NULL; + infoPtr = infoPtr->nextPtr) { + if (infoPtr->socket == eventPtr->socket) { + break; + } + } + + /* + * 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; + } 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. + */ + + (void) (*winSock.WSAAsyncSelect)(infoPtr->socket, tsdPtr->hwnd, 0, 0); + + 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 { + (void) (*winSock.WSAAsyncSelect)(infoPtr->socket, tsdPtr->hwnd, + SOCKET_MESSAGE, infoPtr->selectEvents); + infoPtr->readyEvents &= ~(FD_READ); + } + } + if (events & (FD_WRITE | FD_CONNECT)) { + mask |= TCL_WRITABLE; + } + + 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; + SocketInfo **nextPtrPtr; + 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((*winSock.WSAGetLastError)()); + errorCode = Tcl_GetErrno(); + } + } + + /* + * Remove the socket from socketList. + */ + + for (nextPtrPtr = &(tsdPtr->socketList); (*nextPtrPtr) != NULL; + nextPtrPtr = &((*nextPtrPtr)->nextPtr)) { + if ((*nextPtrPtr) == infoPtr) { + (*nextPtrPtr) = infoPtr->nextPtr; + break; + } + } + + ckfree((char *) infoPtr); + return errorCode; +} + +/* + *---------------------------------------------------------------------- + * + * NewSocketInfo -- + * + * This function allocates and initializes a new SocketInfo + * structure. + * + * Results: + * Returns a newly allocated SocketInfo. + * + * Side effects: + * Adds the socket to the global socket list. + * + *---------------------------------------------------------------------- + */ + +static SocketInfo * +NewSocketInfo(socket) + SOCKET socket; +{ + SocketInfo *infoPtr; + ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey); + + infoPtr = (SocketInfo *) ckalloc((unsigned) sizeof(SocketInfo)); + infoPtr->socket = socket; + infoPtr->flags = 0; + infoPtr->watchEvents = 0; + infoPtr->readyEvents = 0; + infoPtr->selectEvents = 0; + infoPtr->acceptProc = NULL; + infoPtr->lastError = 0; + + infoPtr->nextPtr = tsdPtr->socketList; + tsdPtr->socketList = infoPtr; + + 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: + * Adds a new socket to the socketList. + * + *---------------------------------------------------------------------- + */ + +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. */ + 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. */ + 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. */ + struct sockaddr_in sockaddr; /* Socket address */ + struct sockaddr_in mysockaddr; /* Socket address for client */ + SOCKET sock; + 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(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, (struct sockaddr *) &sockaddr, + sizeof(sockaddr)) == 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, (struct sockaddr *) &mysockaddr, + sizeof(struct sockaddr)) == 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, FIONBIO, &flag) == SOCKET_ERROR) { + goto error; + } + } + + /* + * Attempt to connect to the remote socket. + */ + + if ((*winSock.connect)(sock, (struct sockaddr *) &sockaddr, + sizeof(sockaddr)) == SOCKET_ERROR) { + TclWinConvertWSAError((*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, FIONBIO, &flag); + (void) (*winSock.WSAAsyncSelect)(infoPtr->socket, tsdPtr->hwnd, + SOCKET_MESSAGE, infoPtr->selectEvents); + + return infoPtr; + +error: + TclWinConvertWSAError((*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) + struct sockaddr_in *sockaddrPtr; /* Socket address */ + 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; + } + + (void) memset((char *) sockaddrPtr, '\0', sizeof(struct sockaddr_in)); + sockaddrPtr->sin_family = AF_INET; + sockaddrPtr->sin_port = (*winSock.htons)((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((char *) &addr, + (char *) hostent->h_addr_list[0], + (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? */ +{ + MSG msg; + 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. + */ + + (void) (*winSock.WSAAsyncSelect)(infoPtr->socket, tsdPtr->hwnd, 0, 0); + (void) (*winSock.WSAAsyncSelect)(infoPtr->socket, tsdPtr->hwnd, + SOCKET_MESSAGE, infoPtr->selectEvents); + + while (1) { + /* + * Process all outstanding messages on the socket window. + */ + + while (PeekMessage(&msg, tsdPtr->hwnd, 0, 0, PM_REMOVE)) { + DispatchMessage(&msg); + } + + 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. + */ + + WaitMessage(); + } + + + (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. */ + char *host; /* Host on which to open port. */ + 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 = + (ThreadSpecificData *)TclThreadDataKeyGet(&dataKey); + + if (TclpHasSockets(NULL) != TCL_OK) { + return NULL; + } + + /* + * Set kernel space buffering and non-blocking. + */ + + TclSockMinimumBuffers((SOCKET) 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; + (void) (*winSock.WSAAsyncSelect)(infoPtr->socket, tsdPtr->hwnd, + SOCKET_MESSAGE, infoPtr->selectEvents); + + 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. */ + 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; + struct sockaddr_in addr; + int len; + char channelName[16 + TCL_INTEGER_SPACE]; + ThreadSpecificData *tsdPtr = + (ThreadSpecificData *)TclThreadDataKeyGet(&dataKey); + + /* + * Accept the incoming connection request. + */ + + len = sizeof(struct sockaddr_in); + newSocket = (*winSock.accept)(infoPtr->socket, (struct 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. + */ + + infoPtr->readyEvents &= ~(FD_ACCEPT); + + if (newSocket == INVALID_SOCKET) { + return; + } + + /* + * 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); + (void) (*winSock.WSAAsyncSelect)(newInfoPtr->socket, tsdPtr->hwnd, + SOCKET_MESSAGE, newInfoPtr->selectEvents); + + 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; + int 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) { + (void) (*winSock.WSAAsyncSelect)(infoPtr->socket, tsdPtr->hwnd, + 0, 0); + 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; + } + } + + (void) (*winSock.WSAAsyncSelect)(infoPtr->socket, tsdPtr->hwnd, + SOCKET_MESSAGE, infoPtr->selectEvents); + 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. */ + 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; + int 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) { + (void) (*winSock.WSAAsyncSelect)(infoPtr->socket, tsdPtr->hwnd, + 0, 0); + 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; + } + } + + (void) (*winSock.WSAAsyncSelect)(infoPtr->socket, tsdPtr->hwnd, + SOCKET_MESSAGE, infoPtr->selectEvents); + return bytesWritten; +} + +/* + *---------------------------------------------------------------------- + * + * 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 */ + 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; + struct sockaddr_in sockname; + struct sockaddr_in peername; + struct hostent *hostEntPtr; + SOCKET sock; + int size = sizeof(struct 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; + int err, 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, (struct sockaddr *) &peername, &size) + == 0) { + if (len == 0) { + Tcl_DStringAppendElement(dsPtr, "-peername"); + Tcl_DStringStartSublist(dsPtr); + } + Tcl_DStringAppendElement(dsPtr, + (*winSock.inet_ntoa)(peername.sin_addr)); + 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((*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, (struct sockaddr *) &sockname, &size) + == 0) { + if (len == 0) { + Tcl_DStringAppendElement(dsPtr, "-sockname"); + Tcl_DStringStartSublist(dsPtr); + } + Tcl_DStringAppendElement(dsPtr, + (*winSock.inet_ntoa)(sockname.sin_addr)); + 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((*winSock.WSAGetLastError)()); + Tcl_AppendResult(interp, "can't get sockname: ", + Tcl_PosixError(interp), + (char *) NULL); + } + return TCL_ERROR; + } + } + + if (len > 0) { + 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. + */ + + infoPtr->watchEvents = 0; + if (mask & TCL_READABLE) { + infoPtr->watchEvents |= (FD_READ|FD_CLOSE|FD_ACCEPT); + } + if (mask & TCL_WRITABLE) { + infoPtr->watchEvents |= (FD_WRITE|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; +} + +/* + *---------------------------------------------------------------------- + * + * 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 = TCL_TSD_INIT(&dataKey); + + if (message != SOCKET_MESSAGE) { + return DefWindowProc(hwnd, message, wParam, lParam); + } + + event = WSAGETSELECTEVENT(lParam); + error = WSAGETSELECTERROR(lParam); + socket = (SOCKET) wParam; + + /* + * Find the specified socket on the socket list and update its + * eventState flag. + */ + + for (infoPtr = tsdPtr->socketList; infoPtr != NULL; + infoPtr = infoPtr->nextPtr) { + if (infoPtr->socket == socket) { + /* + * Update the socket state. + */ + + if (event & FD_CLOSE) { + infoPtr->readyEvents &= ~(FD_WRITE|FD_ACCEPT); + } + if (event & FD_CONNECT) { + /* + * The socket is now connected, so 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(error); + infoPtr->lastError = Tcl_GetErrno(); + } + + } + if(infoPtr->flags & SOCKET_ASYNC_CONNECT) { + infoPtr->flags &= ~(SOCKET_ASYNC_CONNECT); + if (error != ERROR_SUCCESS) { + TclWinConvertWSAError(error); + infoPtr->lastError = Tcl_GetErrno(); + } + infoPtr->readyEvents |= FD_WRITE; + } + infoPtr->readyEvents |= event; + break; + } + } + + /* + * Flush the Tcl event queue before returning to the event loop. + */ + + Tcl_ServiceAll(); + + 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. + * + *---------------------------------------------------------------------- + */ + +char * +Tcl_GetHostName() +{ + DWORD length; + WCHAR wbuf[MAX_COMPUTERNAME_LENGTH + 1]; + + Tcl_MutexLock(&socketMutex); + if (hostnameInitialized) { + Tcl_MutexUnlock(&socketMutex); + return hostname; + } + + if (TclpHasSockets(NULL) == TCL_OK) { + /* + * INTL: bug + */ + + if ((*winSock.gethostname)(hostname, sizeof(hostname)) == 0) { + hostnameInitialized = 1; + Tcl_MutexUnlock(&socketMutex); + return hostname; + } + } + 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); +} -- cgit v0.12