struct addrinfo *addrlist;	/* Addresses to connect to. */
    struct addrinfo *addr;	/* Iterator over addrlist. */
    struct addrinfo *myaddrlist;/* Local address. */
    struct addrinfo *myaddr;	/* Iterator over myaddrlist. */
    int connectError;		/* Cache status of async socket. */
    int cachedBlocking;         /* Cache blocking mode of async socket. */
    volatile int notifierConnectError;
				/* Async connect error set by notifier thread.
				 * This error is still a windows error code.
				 * Access must be protected by semaphore */
    struct TcpState *nextPtr;	/* The next socket on the per-thread socket
				 * list. */
};

/*
 * These bits may be ORed together into the "flags" field of a TcpState
 * structure.
 */

#define TCP_NONBLOCKING		(1<<0)	/* Socket with non-blocking I/O */
#define TCP_ASYNC_CONNECT	(1<<1)	/* Async connect in progress. */
#define SOCKET_EOF		(1<<2)	/* A zero read happened on the
					 * socket. */
#define SOCKET_PENDING		(1<<3)	/* A message has been sent for this
					 * socket */

#define TCP_ASYNC_PENDING	(1<<4)	/* TcpConnect was called to
					 * process an async connect. This
					 * flag indicates that reentry is
					 * still pending */

#define TCP_ASYNC_FAILED	(1<<5)	/* An async connect finally failed */

/*
 * The following structure is what is added to the Tcl event queue when a
 * socket event occurs.
 */

typedef struct {

    int mode)			/* The mode to set. Can be one of
				 * TCL_MODE_BLOCKING or
				 * TCL_MODE_NONBLOCKING. */
{
    TcpState *statePtr = instanceData;

    if (mode == TCL_MODE_NONBLOCKING) {
	statePtr->flags |= TCP_NONBLOCKING;
    } else {
	statePtr->flags &= ~(TCP_NONBLOCKING);
    }
    return 0;
}

/*
 *----------------------------------------------------------------------
 *
 * WaitForConnect --
 *
 *	Check the state of an async connect process. If a connection
 *	attempt terminated, process it, which may finalize it or may
 *	start the next attempt. If a connect error occures, it is saved
 *	in statePtr->connectError to be reported by 'fconfigure -error'.
 *
 *	There are two modes of operation, defined by errorCodePtr:
 *	 *  non-NULL: Called by explicite read/write command. block if
 *	    socket is blocking.
 *	    May return two error codes:
 *	     *	EWOULDBLOCK: if connect is still in progress
 *	     *	ENOTCONN: if connect failed. This would be the error
 *		message of a rect or sendto syscall so this is
 *		emulated here.
 *	 *  Null: Called by a backround operation. Do not block and
 *	    don't return any error code.
 *
 * Results:
 * 	0 if the connection has completed, -1 if still in progress
 * 	or there is an error.
 *
 * Side effects:
 *	Processes socket events off the system queue.
 *	May process asynchroneous connect.
 *
 *----------------------------------------------------------------------
 */

static int
WaitForConnect(
    TcpState *statePtr,		/* State of the socket. */
    int *errorCodePtr)		/* Where to store errors?
				 * A passed null-pointer activates background mode.




				 */
{
    int result;
    int oldMode;
    ThreadSpecificData *tsdPtr;

    /*
     * Check if an async connect failed already and error reporting is demanded,
     * return the error ENOTCONN
     */

    if ( errorCodePtr != NULL &&
	    (statePtr->flags & TCP_ASYNC_FAILED) ) {
	*errorCodePtr = ENOTCONN;

	return -1;
    }

    /*
     * Check if an async connect is running. If not return ok
     */
     
    if ( !(statePtr->flags & TCP_ASYNC_PENDING) )
	return 0;

    /*
     * Be sure to disable event servicing so we are truly modal.
     */

    oldMode = Tcl_SetServiceMode(TCL_SERVICE_NONE);

    /*
     * Loop in the blocking case until the connect signal is present
     */

    while (1) {

	/* get statePtr lock */
        tsdPtr = TclThreadDataKeyGet(&dataKey);
	WaitForSingleObject(tsdPtr->socketListLock, INFINITE);
	
	/* Check for connect event */
	if (statePtr->readyEvents & FD_CONNECT) {

	    /* Consume the connect event */
	    statePtr->readyEvents &= ~(FD_CONNECT);

	    /*
	     * For blocking sockets and foreground processing
	     * disable async connect as we continue now synchoneously
	     */
	    if ( errorCodePtr != NULL &&
		    ! (statePtr->flags & TCP_NONBLOCKING) ) {
		CLEAR_BITS(statePtr->flags, TCP_ASYNC_CONNECT);
	    }

	    /* Free list lock */
	    SetEvent(tsdPtr->socketListLock);

	    /*
	     * Continue connect.
	     * If switched to synchroneous connect, the connect is terminated.
	     */
	    result = TcpConnect(NULL, statePtr);

	    /* Restore event service mode */
	    (void) Tcl_SetServiceMode(oldMode);

	    /*
	     * Check for Succesfull connect or async connect restart
	     */

	    if (result == TCL_OK) {
		/*
		 * Check for async connect restart
		 * (not possible for foreground blocking operation)
		 */
		if ( statePtr->flags & TCP_ASYNC_PENDING ) {
		    if (errorCodePtr != NULL) {
			*errorCodePtr = EWOULDBLOCK;
		    }
		    return -1;
		}
		return 0;
	    }

	    /*
	     * Connect finally failed.
	     * For foreground operation return ENOTCONN.
	     */

	    if (errorCodePtr != NULL) {
		*errorCodePtr = ENOTCONN;


	    }
	    return -1;
	}

        /* Free list lock */
        SetEvent(tsdPtr->socketListLock);

	/*
	 * Background operation returns with no action as there was no connect
	 * event
	 */

	if ( errorCodePtr == NULL ) {

	    return -1;
	}

	/*
	 * A non blocking socket waiting for an asyncronous connect
	 * returns directly the error EWOULDBLOCK
	 */

	if (statePtr->flags & TCP_NONBLOCKING) {
	    *errorCodePtr = EWOULDBLOCK;
	    return -1;
	}

	/*
	 * Wait until something happens.
	 */

	    break;
	}

	/*
	 * Check for error condition or underflow in non-blocking case.
	 */

	if ((statePtr->flags & TCP_NONBLOCKING) || (error != WSAEWOULDBLOCK)) {
	    TclWinConvertError(error);
	    *errorCodePtr = Tcl_GetErrno();
	    bytesRead = -1;
	    break;
	}

	/*

	 * event. Note that Windows only sends a new writable event after a
	 * send fails with WSAEWOULDBLOCK.
	 */

	error = WSAGetLastError();
	if (error == WSAEWOULDBLOCK) {
	    statePtr->readyEvents &= ~(FD_WRITE);
	    if (statePtr->flags & TCP_NONBLOCKING) {
		*errorCodePtr = EWOULDBLOCK;
		written = -1;
		break;
	    }
	} else {
	    TclWinConvertError(error);
	    *errorCodePtr = Tcl_GetErrno();

    if ((len > 1) && (optionName[1] == 'e') &&
	    (strncmp(optionName, "-error", len) == 0)) {

	/*
	* Do not return any errors if async connect is running
	*/
	if ( ! (statePtr->flags & TCP_ASYNC_PENDING) ) {


	    if ( statePtr->flags & TCP_ASYNC_FAILED ) {

		/*
		 * In case of a failed async connect, eventually report the
		 * connect error only once.
		 * Do not report the system error, as this comes again and again.
		 */

		int ret;
		DWORD err;

		/*
		 * Populater the err Variable with a possix error
		 */
		optlen = sizeof(int);
		ret = getsockopt(sock, SOL_SOCKET, SO_ERROR,
			(char *)&err, &optlen);
		/*
		 * The error was not returned directly but should be
		 * taken from WSA
		 */
		if (ret == SOCKET_ERROR) {
		    err = WSAGetLastError();

	return TCL_OK;
    }

    if ((len > 1) && (optionName[1] == 'c') &&
	    (strncmp(optionName, "-connecting", len) == 0)) {

	Tcl_DStringAppend(dsPtr,
		(statePtr->flags & TCP_ASYNC_PENDING)
		? "1" : "0", -1);
        return TCL_OK;
    }

    if (interp != NULL && Tcl_GetVar(interp, SUPPRESS_RDNS_VAR, 0) != NULL) {
	reverseDNS = NI_NUMERICHOST;
    }

	    /* get statePtr lock */
	    WaitForSingleObject(tsdPtr->socketListLock, INFINITE);

	    /*
	     * Reset last error from last try
	     */
	    statePtr->notifierConnectError = 0;
	    Tcl_SetErrno(0);
	    
	    statePtr->sockets->fd = socket(statePtr->myaddr->ai_family, SOCK_STREAM, 0);
	    
	    /* Free list lock */
	    SetEvent(tsdPtr->socketListLock);

		/*
		 * Asynchroneous connect
		 */

		/*
		 * Remember that we jump back behind this next round
		 */
		statePtr->flags |= TCP_ASYNC_PENDING;
		return TCL_OK;

	    reenter:
		/*
		 * Re-entry point for async connect after connect event or
		 * blocking operation
		 *
		 * Clear the reenter flag
		 */
		statePtr->flags &= ~(TCP_ASYNC_PENDING);
		/* get statePtr lock */
		WaitForSingleObject(tsdPtr->socketListLock, INFINITE);
		/* Get signaled connect error */
		TclWinConvertError((DWORD) statePtr->notifierConnectError);
		/* Clear eventual connect flag */
		statePtr->selectEvents &= ~(FD_CONNECT);
		/* Free list lock */
		SetEvent(tsdPtr->socketListLock);
	    }

	    /*

	     */
	    statePtr->selectEvents = FD_WRITE|FD_READ;
	    /* get statePtr lock */
	    WaitForSingleObject(tsdPtr->socketListLock, INFINITE);
	    /* Signal ready readable and writable events */
	    statePtr->readyEvents |= FD_WRITE | FD_READ;
	    /* Flag error to event routine */
	    statePtr->flags |= TCP_ASYNC_FAILED;
	    /* Save connect error to be reported by 'fconfigure -error' */
	    statePtr->connectError = Tcl_GetErrno();
	    /* Free list lock */
	    SetEvent(tsdPtr->socketListLock);
	}
	/*
	 * Error message on syncroneous connect
	 */
	if (interp != NULL) {

 * InitSockets --
 *
 *	Initialize the socket module.  If winsock startup is successful,
 *	registers the event window for the socket notifier code.
 *
 *	Assumes socketMutex is held.
 *
 * Warning:
 *	This check was useful in times of Windows98 where WinSock may
 *	not be available. This is not the case any more.
 *	This function may be removed with TCL 9.0.
 *	Any failures may be reported as panics.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Initializes winsock, registers a new window class and creates a
 *	window for use in asynchronous socket notification.
 *

/*
 *----------------------------------------------------------------------
 *
 * SocketsEnabled --
 *
 *	Check that the WinSock was successfully initialized.
 *
 * Warning:
 *	This check was useful in times of Windows98 where WinSock may
 *	not be available. This is not the case any more.
 *	This function may be removed with TCL 9.0
 *
 * Results:
 *	1 if it is.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------

    statePtr->flags &= ~SOCKET_PENDING;

    /*
     * Continue async connect if pending and ready
     */

    if ( statePtr->readyEvents & FD_CONNECT ) {
	if ( statePtr->flags & TCP_ASYNC_PENDING ) {

	    /*
	     * Do one step and save eventual connect error
	     */

	    SetEvent(tsdPtr->socketListLock);
	    WaitForConnect(statePtr,NULL);

	mask |= TCL_READABLE|TCL_WRITABLE;
    } else if (events & FD_READ) {

	/*
	 * Throw the readable event if an async connect failed.
	 */

	if ( statePtr->flags & TCP_ASYNC_FAILED ) {

	    mask |= TCL_READABLE;
	    
	} else {
	    fd_set readFds;
	    struct timeval timeout;

	/* exit loop if event occured */
	if (event_found) {
	    break;
	}
	
	/* Exit loop if event did not occur but this is a non-blocking channel */
	if (statePtr->flags & TCP_NONBLOCKING) {
	    *errorCodePtr = EWOULDBLOCK;
	    result = 0;
	    break;
	}

	/*
	 * Wait until something happens.

	    if (event & FD_CONNECT) {
		/*
		 * Remember any error that occurred so we can report
		 * connection failures.
		 */
		if (error != ERROR_SUCCESS) {

		    statePtr->notifierConnectError = error;
		}
	    }
	    /*
	     * Inform main thread about signaled events
	     */
	    statePtr->readyEvents |= event;

 *
 * 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.
 *	Those functions are exported by the stubs table.
 *
 * Warning:
 *	Those functions are depreciated and will be removed with TCL 9.0.
 *
 * Results:
 *	As defined for each function.
 *
 * Side effects:
 *	As defined for each function.
 *