static int  TlsCloseProc (ClientData instanceData, Tcl_Interp *interp);
static int  TlsInputProc (ClientData instanceData, char *buf, int bufSize, int *errorCodePtr);
static int  TlsOutputProc (ClientData instanceData, const char *buf, int toWrite, int *errorCodePtr);
static int  TlsGetOptionProc (ClientData instanceData, Tcl_Interp *interp, const char *optionName, Tcl_DString *dsPtr);
static void TlsWatchProc (ClientData instanceData, int mask);
static int  TlsGetHandleProc (ClientData instanceData, int direction, ClientData *handlePtr);
static int  TlsNotifyProc (ClientData instanceData, int mask);
#if 0
static void TlsChannelHandler (ClientData clientData, int mask);
#endif
static void TlsChannelHandlerTimer (ClientData clientData);

/*
 * TLS Channel Type
 */
static Tcl_ChannelType *tlsChannelType = NULL;

















/*
 *-------------------------------------------------------------------
 *
 * Tls_ChannelType --
 *
 *	Return the correct TLS channel driver info
 *
 * Results:
 *	The correct channel driver for the current version of Tcl.
 *
 * Side effects:
 *	None.
 *
 *-------------------------------------------------------------------
 */
Tcl_ChannelType *Tls_ChannelType(void) {
	unsigned int size;

	/*
	 * Initialize the channel type if necessary
	 */
	if (tlsChannelType == NULL) {
		/*
		 * Allocation of a new channeltype structure is not easy, because of
		 * the various verson of the core and subsequent changes to the
		 * structure. The main challenge is to allocate enough memory for
		 * modern versions even if this extsension is compiled against one
		 * of the older variant!
		 *
		 * (1) Versions before stubs (8.0.x) are simple, because they are
		 *     supported only if the extension is compiled against exactly
		 *     that version of the core.
		 *
		 * (2) With stubs we just determine the difference between the older
		 *     and modern variant and overallocate accordingly if compiled
		 *     against an older variant.
		 */
		size = sizeof(Tcl_ChannelType); /* Base size */

		tlsChannelType = (Tcl_ChannelType *) ckalloc(size);
		memset(tlsChannelType, 0, size);

		/*
		 * Common elements of the structure (no changes in location or name)
		 * close2Proc, seekProc, setOptionProc stay NULL.
		 */

		tlsChannelType->typeName	= "tls";
		tlsChannelType->closeProc	= TlsCloseProc;
		tlsChannelType->inputProc	= TlsInputProc;
		tlsChannelType->outputProc	= TlsOutputProc;
		tlsChannelType->getOptionProc	= TlsGetOptionProc;
		tlsChannelType->watchProc	= TlsWatchProc;
		tlsChannelType->getHandleProc	= TlsGetHandleProc;

		/*
		 * Compiled against 8.3.2+. Direct access to all elements possible. Use
		 * channelTypeVersion information to select the values to use.
		 */

		/*
		 * For the 8.3.2 core we present ourselves as a version 2
		 * driver. This means a special value in version (ex
		 * blockModeProc), blockModeProc in a different place and of
		 * course usage of the handlerProc.
		 */
		tlsChannelType->version       = TCL_CHANNEL_VERSION_5;
		tlsChannelType->blockModeProc = TlsBlockModeProc;
		tlsChannelType->handlerProc   = TlsNotifyProc;
	}

	return(tlsChannelType);
}

/*
 *-------------------------------------------------------------------
 *
 * TlsBlockModeProc --
 *