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Comment:Merge reflected channel improvements.
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SHA1:3c6eba5c93f16e93dc574cd68a75b0318be5d8a2
User & Date: dgp 2014-04-17 18:10:02
Context
2014-04-21
19:04
Merge refcounting machinery for ChannelBuffer. check-in: 0c1015d94d user: dgp tags: trunk
2014-04-20
15:29
merge trunk check-in: 95c09d2f0b user: dkf tags: dkf-http-cookies
2014-04-17
19:11
merge trunk check-in: 15f3a695ca user: dgp tags: dgp-trunk-read
18:10
Merge reflected channel improvements. check-in: 3c6eba5c93 user: dgp tags: trunk
17:55
Reflected channels. Keep a set of method names cached so we don't create new each operation, and we... check-in: 4c7df62128 user: dgp tags: core-8-5-branch
14:01
Remove all win95-specific test-cases, since Windows 95 is not supported any more. check-in: 324a458635 user: jan.nijtmans tags: trunk
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Changes to generic/tclIORChan.c.

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				 * command is gone.
				 */
#ifdef TCL_THREADS
    Tcl_ThreadId thread;	/* Thread the 'interp' belongs to. == Handler thread */
    Tcl_ThreadId owner;         /* Thread owning the structure.    == Channel thread */
#endif
    Tcl_Obj *cmd;		/* Callback command prefix */
    int methods;		/* Bitmask of supported methods */

    /*
     * NOTE (9): Should we have predefined shared literals for the method
     * names?
     */


    int mode;			/* Mask of R/W mode */
    int interest;		/* Mask of events the channel is interested
				 * in. */

    int dead;			/* Boolean signal that some operations
				 * should no longer be attempted. */
................................................................................
			    const char *objName, Tcl_Obj *obj, int *mask);
static Tcl_Obj *	DecodeEventMask(int mask);
static ReflectedChannel * NewReflectedChannel(Tcl_Interp *interp,
			    Tcl_Obj *cmdpfxObj, int mode, Tcl_Obj *handleObj);
static Tcl_Obj *	NextHandle(void);
static void		FreeReflectedChannel(ReflectedChannel *rcPtr);
static int		InvokeTclMethod(ReflectedChannel *rcPtr,
			    const char *method, Tcl_Obj *argOneObj,
			    Tcl_Obj *argTwoObj, Tcl_Obj **resultObjPtr);

static ReflectedChannelMap *	GetReflectedChannelMap(Tcl_Interp *interp);
static void		DeleteReflectedChannelMap(ClientData clientData,
			    Tcl_Interp *interp);
static int		ErrnoReturn(ReflectedChannel *rcPtr, Tcl_Obj *resObj);

................................................................................
/*
 * Global constant strings (messages). ==================
 * These string are used directly as bypass errors, thus they have to be valid
 * Tcl lists where the last element is the message itself. Hence the
 * list-quoting to keep the words of the message together. See also [x].
 */

static const char *msg_read_unsup = "{read not supported by Tcl driver}";
static const char *msg_read_toomuch = "{read delivered more than requested}";
static const char *msg_write_unsup = "{write not supported by Tcl driver}";
static const char *msg_write_toomuch = "{write wrote more than requested}";
static const char *msg_write_nothing = "{write wrote nothing}";
static const char *msg_seek_beforestart = "{Tried to seek before origin}";
#ifdef TCL_THREADS
static const char *msg_send_originlost = "{Channel thread lost}";
static const char *msg_send_dstlost    = "{Owner lost}";
#endif /* TCL_THREADS */
................................................................................

    /*
     * Now create the channel.
     */

    rcId = NextHandle();
    rcPtr = NewReflectedChannel(interp, cmdObj, mode, rcId);
    chan = Tcl_CreateChannel(&tclRChannelType, TclGetString(rcId), rcPtr,
	    mode);
    rcPtr->chan = chan;
    Tcl_Preserve(chan);
    chanPtr = (Channel *) chan;

    /*
     * Invoke 'initialize' and validate that the handler is present and ok.
     * Squash the channel if not.
     *
     * Note: The conversion of 'mode' back into a Tcl_Obj ensures that
     * 'initialize' is invoked with canonical mode names, and no
     * abbreviations. Using modeObj directly could feed abbreviations into the
     * handler, and the handler is not specified to handle such.
     */

    modeObj = DecodeEventMask(mode);
    /* assert modeObj.refCount == 1 */
    result = InvokeTclMethod(rcPtr, "initialize", modeObj, NULL, &resObj);
    Tcl_DecrRefCount(modeObj);

    if (result != TCL_OK) {
	UnmarshallErrorResult(interp, resObj);
	Tcl_DecrRefCount(resObj);	/* Remove reference held from invoke */
	goto error;
    }
................................................................................

    Tcl_ResetResult(interp);

    /*
     * Everything is fine now.
     */

    rcPtr->methods = methods;





    if ((methods & NULLABLE_METHODS) != NULLABLE_METHODS) {
	/*
	 * Some of the nullable methods are not supported. We clone the
	 * channel type, null the associated C functions, and use the result
	 * as the actual channel type.
	 */
................................................................................
     */

    Tcl_SetObjResult(interp,
            Tcl_NewStringObj(chanPtr->state->channelName, -1));
    return TCL_OK;

  error:
    /*
     * Signal to ReflectClose to not call 'finalize'.
     */

    rcPtr->methods = 0;
    Tcl_Close(interp, chan);
    return TCL_ERROR;

#undef MODE
#undef CMD
}
 
/*
................................................................................
	}
#endif

        Tcl_EventuallyFree(rcPtr, (Tcl_FreeProc *) FreeReflectedChannel);
	return EOK;
    }

    /*
     * -- No -- ASSERT rcPtr->methods & FLAG(METH_FINAL)
     *
     * A cleaned method mask here implies that the channel creation was
     * aborted, and "finalize" must not be called.
     */

    if (rcPtr->methods == 0) {
        Tcl_EventuallyFree(rcPtr, (Tcl_FreeProc *) FreeReflectedChannel);
	return EOK;
    }

    /*
     * Are we in the correct thread?
     */

#ifdef TCL_THREADS
    if (rcPtr->thread != Tcl_GetCurrentThread()) {
	ForwardParam p;
................................................................................
        Tcl_EventuallyFree(rcPtr, (Tcl_FreeProc *) FreeReflectedChannel);

	if (result != TCL_OK) {
	    PassReceivedErrorInterp(interp, &p);
	}
    } else {
#endif
	result = InvokeTclMethod(rcPtr, "finalize", NULL, NULL, &resObj);
	if ((result != TCL_OK) && (interp != NULL)) {
	    Tcl_SetChannelErrorInterp(interp, resObj);
	}

	Tcl_DecrRefCount(resObj);	/* Remove reference we held from the
					 * invoke */

................................................................................
{
    ReflectedChannel *rcPtr = clientData;
    Tcl_Obj *toReadObj;
    int bytec;			/* Number of returned bytes */
    unsigned char *bytev;	/* Array of returned bytes */
    Tcl_Obj *resObj;		/* Result data for 'read' */

    /*
     * The following check can be done before thread redirection, because we
     * are reading from an item which is readonly, i.e. will never change
     * during the lifetime of the channel.
     */

    if (!(rcPtr->methods & FLAG(METH_READ))) {
	SetChannelErrorStr(rcPtr->chan, msg_read_unsup);
	*errorCodePtr = EINVAL;
	return -1;
    }

    /*
     * Are we in the correct thread?
     */

#ifdef TCL_THREADS
    if (rcPtr->thread != Tcl_GetCurrentThread()) {
	ForwardParam p;
................................................................................
    /* ASSERT: rcPtr->mode & TCL_READABLE */

    Tcl_Preserve(rcPtr);

    toReadObj = Tcl_NewIntObj(toRead);
    Tcl_IncrRefCount(toReadObj);

    if (InvokeTclMethod(rcPtr, "read", toReadObj, NULL, &resObj)!=TCL_OK) {
	int code = ErrnoReturn(rcPtr, resObj);

	if (code < 0) {
	    *errorCodePtr = -code;
            goto error;
	}

................................................................................
    int *errorCodePtr)
{
    ReflectedChannel *rcPtr = clientData;
    Tcl_Obj *bufObj;
    Tcl_Obj *resObj;		/* Result data for 'write' */
    int written;

    /*
     * The following check can be done before thread redirection, because we
     * are reading from an item which is readonly, i.e. will never change
     * during the lifetime of the channel.
     */

    if (!(rcPtr->methods & FLAG(METH_WRITE))) {
	SetChannelErrorStr(rcPtr->chan, msg_write_unsup);
	*errorCodePtr = EINVAL;
	return -1;
    }

    /*
     * Are we in the correct thread?
     */

#ifdef TCL_THREADS
    if (rcPtr->thread != Tcl_GetCurrentThread()) {
	ForwardParam p;
................................................................................
    /* ASSERT: rcPtr->mode & TCL_WRITABLE */

    Tcl_Preserve(rcPtr);

    bufObj = Tcl_NewByteArrayObj((unsigned char *) buf, toWrite);
    Tcl_IncrRefCount(bufObj);

    if (InvokeTclMethod(rcPtr, "write", bufObj, NULL, &resObj) != TCL_OK) {
	int code = ErrnoReturn(rcPtr, resObj);

	if (code < 0) {
	    *errorCodePtr = -code;
            goto error;
	}

................................................................................
    offObj  = Tcl_NewWideIntObj(offset);
    baseObj = Tcl_NewStringObj(
            (seekMode == SEEK_SET) ? "start" :
            (seekMode == SEEK_CUR) ? "current" : "end", -1);
    Tcl_IncrRefCount(offObj);
    Tcl_IncrRefCount(baseObj);

    if (InvokeTclMethod(rcPtr, "seek", offObj, baseObj, &resObj) != TCL_OK) {
	Tcl_SetChannelError(rcPtr->chan, resObj);
        goto invalid;
    }

    if (Tcl_GetWideIntFromObj(rcPtr->interp, resObj, &newLoc) != TCL_OK) {
	Tcl_SetChannelError(rcPtr->chan, MarshallError(rcPtr->interp));
        goto invalid;
................................................................................
ReflectWatch(
    ClientData clientData,
    int mask)
{
    ReflectedChannel *rcPtr = clientData;
    Tcl_Obj *maskObj;

    /* ASSERT rcPtr->methods & FLAG(METH_WATCH) */

    /*
     * We restrict the interest to what the channel can support. IOW there
     * will never be write events for a channel which is not writable.
     * Analoguously for read events and non-readable channels.
     */

    mask &= rcPtr->mode;
................................................................................
    }
#endif

    Tcl_Preserve(rcPtr);

    maskObj = DecodeEventMask(mask);
    /* assert maskObj.refCount == 1 */
    (void) InvokeTclMethod(rcPtr, "watch", maskObj, NULL, NULL);
    Tcl_DecrRefCount(maskObj);

    Tcl_Release(rcPtr);
}
 
/*
 *----------------------------------------------------------------------
................................................................................
#endif

    blockObj = Tcl_NewBooleanObj(!nonblocking);
    Tcl_IncrRefCount(blockObj);

    Tcl_Preserve(rcPtr);

    if (InvokeTclMethod(rcPtr, "blocking", blockObj, NULL, &resObj)!=TCL_OK) {
	Tcl_SetChannelError(rcPtr->chan, resObj);
	errorNum = EINVAL;
    } else {
	errorNum = EOK;
    }

    Tcl_DecrRefCount(blockObj);
................................................................................

    optionObj = Tcl_NewStringObj(optionName, -1);
    valueObj = Tcl_NewStringObj(newValue, -1);

    Tcl_IncrRefCount(optionObj);
    Tcl_IncrRefCount(valueObj);

    result = InvokeTclMethod(rcPtr, "configure",optionObj,valueObj, &resObj);
    if (result != TCL_OK) {
	UnmarshallErrorResult(interp, resObj);
    }

    Tcl_DecrRefCount(optionObj);
    Tcl_DecrRefCount(valueObj);
    Tcl_DecrRefCount(resObj);		/* Remove reference held from invoke */
................................................................................
     */

    ReflectedChannel *rcPtr = clientData;
    Tcl_Obj *optionObj;
    Tcl_Obj *resObj;		/* Result data for 'configure' */
    int listc, result = TCL_OK;
    Tcl_Obj **listv;
    const char *method;

    /*
     * Are we in the correct thread?
     */

#ifdef TCL_THREADS
    if (rcPtr->thread != Tcl_GetCurrentThread()) {
................................................................................
#endif

    if (optionName == NULL) {
	/*
	 * Retrieve all options.
	 */

	method = "cgetall";
	optionObj = NULL;
    } else {
	/*
	 * Retrieve the value of one option.
	 */

	method = "cget";
	optionObj = Tcl_NewStringObj(optionName, -1);
        Tcl_IncrRefCount(optionObj);
    }

    Tcl_Preserve(rcPtr);

    if (InvokeTclMethod(rcPtr, method, optionObj, NULL, &resObj)!=TCL_OK) {
................................................................................
NewReflectedChannel(
    Tcl_Interp *interp,
    Tcl_Obj *cmdpfxObj,
    int mode,
    Tcl_Obj *handleObj)
{
    ReflectedChannel *rcPtr;


    rcPtr = ckalloc(sizeof(ReflectedChannel));

    /* rcPtr->chan: Assigned by caller. Dummy data here. */
    /* rcPtr->methods: Assigned by caller. Dummy data here. */

    rcPtr->chan = NULL;
    rcPtr->methods = 0;
    rcPtr->interp = interp;
    rcPtr->dead = 0;
#ifdef TCL_THREADS
    rcPtr->thread = Tcl_GetCurrentThread();
#endif
    rcPtr->mode = mode;
    rcPtr->interest = 0;		/* Initially no interest registered */

    /* ASSERT: cmdpfxObj is a Tcl List */
    rcPtr->cmd = TclListObjCopy(NULL, cmdpfxObj);
    Tcl_ListObjAppendElement(NULL, rcPtr->cmd, Tcl_NewObj());


    Tcl_ListObjAppendElement(NULL, rcPtr->cmd, handleObj);




    Tcl_IncrRefCount(rcPtr->cmd);
    return rcPtr;
}
 
/*
 *----------------------------------------------------------------------
 *
 * NextHandle --
................................................................................
	 * Delete a cloned ChannelType structure.
	 */

	ckfree(chanPtr->typePtr);
	chanPtr->typePtr = NULL;
    }
    Tcl_Release(chanPtr);


    Tcl_DecrRefCount(rcPtr->cmd);
    ckfree(rcPtr);
}
 
/*
 *----------------------------------------------------------------------
 *
................................................................................
 *
 *----------------------------------------------------------------------
 */

static int
InvokeTclMethod(
    ReflectedChannel *rcPtr,
    const char *method,
    Tcl_Obj *argOneObj,		/* NULL'able */
    Tcl_Obj *argTwoObj,		/* NULL'able */
    Tcl_Obj **resultObjPtr)	/* NULL'able */
{
    Tcl_Obj *methObj = NULL;	/* Method name in object form */
    Tcl_InterpState sr;		/* State of handler interp */
    int result;			/* Result code of method invokation */
    Tcl_Obj *resObj = NULL;	/* Result of method invokation. */
    Tcl_Obj *cmd;
    int len;

    if (rcPtr->dead) {
	/*
	 * The channel is marked as dead. Bail out immediately, with an
	 * appropriate error.
	 */

................................................................................
         * Not touching argOneObj, argTwoObj, they have not been used.
         * See the contract as well.
         */

	return TCL_ERROR;
    }

    /*
     * NOTE (5): Decide impl. issue: Cache objects with method names? Needs
     * TSD data as reflections can be created in many different threads.
     * NO: Caching of command resolutions means storage per channel.
     */

    /*
     * Insert method into the callback command, after the command prefix,
     * before the channel id.
     */

    methObj = Tcl_NewStringObj(method, -1);
    cmd = TclListObjCopy(NULL, rcPtr->cmd);

    ListObjLength(cmd, len);
    Tcl_ListObjReplace(NULL, cmd, len - 2, 1, 1, &methObj);


    /*
     * Append the additional argument containing method specific details
     * behind the channel id. If specified.
     *
     * Because of the contract there is no need to increment the refcounts.
     * The objects will survive the Tcl_EvalObjv without change.
................................................................................
			"chan handler returned bad code: %d", result));
		Tcl_LogCommandInfo(rcPtr->interp, cmdString, cmdString,
			cmdLen);
		Tcl_DecrRefCount(cmd);
		result = TCL_ERROR;
	    }
	    Tcl_AppendObjToErrorInfo(rcPtr->interp, Tcl_ObjPrintf(
		    "\n    (chan handler subcommand \"%s\")", method));

	    resObj = MarshallError(rcPtr->interp);
	}
	Tcl_IncrRefCount(resObj);
    }
    Tcl_DecrRefCount(cmd);
    Tcl_RestoreInterpState(rcPtr->interp, sr);
    Tcl_Release(rcPtr->interp);
................................................................................
	 */

    case ForwardedClose:
	/*
	 * No parameters/results.
	 */

	if (InvokeTclMethod(rcPtr, "finalize", NULL, NULL, &resObj)!=TCL_OK) {
	    ForwardSetObjError(paramPtr, resObj);
	}

	/*
	 * Freeing is done here, in the origin thread, callback command
	 * objects belong to this thread. Deallocating them in a different
	 * thread is not allowed
................................................................................
	break;

    case ForwardedInput: {
	Tcl_Obj *toReadObj = Tcl_NewIntObj(paramPtr->input.toRead);
        Tcl_IncrRefCount(toReadObj);

        Tcl_Preserve(rcPtr);
	if (InvokeTclMethod(rcPtr, "read", toReadObj, NULL, &resObj)!=TCL_OK){
	    int code = ErrnoReturn(rcPtr, resObj);

	    if (code < 0) {
		paramPtr->base.code = code;
	    } else {
		ForwardSetObjError(paramPtr, resObj);
	    }
................................................................................

    case ForwardedOutput: {
	Tcl_Obj *bufObj = Tcl_NewByteArrayObj((unsigned char *)
                paramPtr->output.buf, paramPtr->output.toWrite);
        Tcl_IncrRefCount(bufObj);

        Tcl_Preserve(rcPtr);
	if (InvokeTclMethod(rcPtr, "write", bufObj, NULL, &resObj) != TCL_OK) {
	    int code = ErrnoReturn(rcPtr, resObj);

	    if (code < 0) {
		paramPtr->base.code = code;
	    } else {
		ForwardSetObjError(paramPtr, resObj);
	    }
................................................................................
                (paramPtr->seek.seekMode==SEEK_SET) ? "start" :
                (paramPtr->seek.seekMode==SEEK_CUR) ? "current" : "end", -1);

        Tcl_IncrRefCount(offObj);
        Tcl_IncrRefCount(baseObj);

        Tcl_Preserve(rcPtr);
	if (InvokeTclMethod(rcPtr, "seek", offObj, baseObj, &resObj)!=TCL_OK){
	    ForwardSetObjError(paramPtr, resObj);
	    paramPtr->seek.offset = -1;
	} else {
	    /*
	     * Process a regular result. If the type is wrong this may change
	     * into an error.
	     */
................................................................................
    }

    case ForwardedWatch: {
	Tcl_Obj *maskObj = DecodeEventMask(paramPtr->watch.mask);
        /* assert maskObj.refCount == 1 */

        Tcl_Preserve(rcPtr);
	(void) InvokeTclMethod(rcPtr, "watch", maskObj, NULL, NULL);
	Tcl_DecrRefCount(maskObj);
        Tcl_Release(rcPtr);
	break;
    }

    case ForwardedBlock: {
	Tcl_Obj *blockObj = Tcl_NewBooleanObj(!paramPtr->block.nonblocking);

        Tcl_IncrRefCount(blockObj);
        Tcl_Preserve(rcPtr);
	if (InvokeTclMethod(rcPtr, "blocking", blockObj, NULL,
                &resObj) != TCL_OK) {
	    ForwardSetObjError(paramPtr, resObj);
	}
        Tcl_Release(rcPtr);
        Tcl_DecrRefCount(blockObj);
	break;
    }
................................................................................
    case ForwardedSetOpt: {
	Tcl_Obj *optionObj = Tcl_NewStringObj(paramPtr->setOpt.name, -1);
	Tcl_Obj *valueObj  = Tcl_NewStringObj(paramPtr->setOpt.value, -1);

        Tcl_IncrRefCount(optionObj);
        Tcl_IncrRefCount(valueObj);
        Tcl_Preserve(rcPtr);
	if (InvokeTclMethod(rcPtr, "configure", optionObj, valueObj,
                &resObj) != TCL_OK) {
	    ForwardSetObjError(paramPtr, resObj);
	}
        Tcl_Release(rcPtr);
        Tcl_DecrRefCount(optionObj);
        Tcl_DecrRefCount(valueObj);
	break;
................................................................................
	 * Retrieve the value of one option.
	 */

	Tcl_Obj *optionObj = Tcl_NewStringObj(paramPtr->getOpt.name, -1);

        Tcl_IncrRefCount(optionObj);
        Tcl_Preserve(rcPtr);
	if (InvokeTclMethod(rcPtr, "cget", optionObj, NULL, &resObj)!=TCL_OK){
	    ForwardSetObjError(paramPtr, resObj);
	} else {
	    TclDStringAppendObj(paramPtr->getOpt.value, resObj);
	}
        Tcl_Release(rcPtr);
        Tcl_DecrRefCount(optionObj);
	break;
................................................................................

    case ForwardedGetOptAll:
	/*
	 * Retrieve all options.
	 */

        Tcl_Preserve(rcPtr);
	if (InvokeTclMethod(rcPtr, "cgetall", NULL, NULL, &resObj) != TCL_OK){
	    ForwardSetObjError(paramPtr, resObj);
	} else {
	    /*
	     * Extract list, validate that it is a list, and #elements. See
	     * NOTE (4) as well.
	     */








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96
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103





104
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...
425
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439
...
440
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446

447

448
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...
554
555
556
557
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559
560





561
562
563
564
565
566
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568
569
570
571
572
573
574
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577
578
579
580
581
...
650
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657
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661
662
663
664
665
666
667
668
...
715
716
717
718
719
720
721
722
723
724
725


726
727
728
729
730
731
732
....
1148
1149
1150
1151
1152
1153
1154












1155
1156
1157
1158
1159
1160
1161
....
1172
1173
1174
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1177
1178
1179
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1182
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1184
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1186
....
1246
1247
1248
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1251
1252












1253
1254
1255
1256
1257
1258
1259
....
1284
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1292
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1294
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1296
1297
1298
....
1349
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1355












1356
1357
1358
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1360
1361
1362
....
1387
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1400
1401
....
1501
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1511
1512
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1514
1515
....
1572
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1578


1579
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1585
....
1614
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....
1673
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....
1785
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....
1830
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....
1869
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....
2090
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2101

2102
2103

2104
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2110
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....
2176
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2178
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....
2209
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2222
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2226
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....
2240
2241
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2247
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2250
2251

2252
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2255
2256
2257
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2260
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....
2313
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2321
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2325
2326
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....
2875
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....
2906
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....
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....
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....
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....
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....
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....
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3100
3101
				 * command is gone.
				 */
#ifdef TCL_THREADS
    Tcl_ThreadId thread;	/* Thread the 'interp' belongs to. == Handler thread */
    Tcl_ThreadId owner;         /* Thread owning the structure.    == Channel thread */
#endif
    Tcl_Obj *cmd;		/* Callback command prefix */
    Tcl_Obj *methods;		/* Methods to append to command prefix */





    Tcl_Obj *name;		/* Name of the channel as created */

    int mode;			/* Mask of R/W mode */
    int interest;		/* Mask of events the channel is interested
				 * in. */

    int dead;			/* Boolean signal that some operations
				 * should no longer be attempted. */
................................................................................
			    const char *objName, Tcl_Obj *obj, int *mask);
static Tcl_Obj *	DecodeEventMask(int mask);
static ReflectedChannel * NewReflectedChannel(Tcl_Interp *interp,
			    Tcl_Obj *cmdpfxObj, int mode, Tcl_Obj *handleObj);
static Tcl_Obj *	NextHandle(void);
static void		FreeReflectedChannel(ReflectedChannel *rcPtr);
static int		InvokeTclMethod(ReflectedChannel *rcPtr,
			    MethodName method, Tcl_Obj *argOneObj,
			    Tcl_Obj *argTwoObj, Tcl_Obj **resultObjPtr);

static ReflectedChannelMap *	GetReflectedChannelMap(Tcl_Interp *interp);
static void		DeleteReflectedChannelMap(ClientData clientData,
			    Tcl_Interp *interp);
static int		ErrnoReturn(ReflectedChannel *rcPtr, Tcl_Obj *resObj);

................................................................................
/*
 * Global constant strings (messages). ==================
 * These string are used directly as bypass errors, thus they have to be valid
 * Tcl lists where the last element is the message itself. Hence the
 * list-quoting to keep the words of the message together. See also [x].
 */


static const char *msg_read_toomuch = "{read delivered more than requested}";

static const char *msg_write_toomuch = "{write wrote more than requested}";
static const char *msg_write_nothing = "{write wrote nothing}";
static const char *msg_seek_beforestart = "{Tried to seek before origin}";
#ifdef TCL_THREADS
static const char *msg_send_originlost = "{Channel thread lost}";
static const char *msg_send_dstlost    = "{Owner lost}";
#endif /* TCL_THREADS */
................................................................................

    /*
     * Now create the channel.
     */

    rcId = NextHandle();
    rcPtr = NewReflectedChannel(interp, cmdObj, mode, rcId);






    /*
     * Invoke 'initialize' and validate that the handler is present and ok.
     * Squash the channel if not.
     *
     * Note: The conversion of 'mode' back into a Tcl_Obj ensures that
     * 'initialize' is invoked with canonical mode names, and no
     * abbreviations. Using modeObj directly could feed abbreviations into the
     * handler, and the handler is not specified to handle such.
     */

    modeObj = DecodeEventMask(mode);
    /* assert modeObj.refCount == 1 */
    result = InvokeTclMethod(rcPtr, METH_INIT, modeObj, NULL, &resObj);
    Tcl_DecrRefCount(modeObj);

    if (result != TCL_OK) {
	UnmarshallErrorResult(interp, resObj);
	Tcl_DecrRefCount(resObj);	/* Remove reference held from invoke */
	goto error;
    }
................................................................................

    Tcl_ResetResult(interp);

    /*
     * Everything is fine now.
     */

    chan = Tcl_CreateChannel(&tclRChannelType, TclGetString(rcId), rcPtr,
	    mode);
    rcPtr->chan = chan;
    Tcl_Preserve(chan);
    chanPtr = (Channel *) chan;

    if ((methods & NULLABLE_METHODS) != NULLABLE_METHODS) {
	/*
	 * Some of the nullable methods are not supported. We clone the
	 * channel type, null the associated C functions, and use the result
	 * as the actual channel type.
	 */
................................................................................
     */

    Tcl_SetObjResult(interp,
            Tcl_NewStringObj(chanPtr->state->channelName, -1));
    return TCL_OK;

  error:
    Tcl_DecrRefCount(rcPtr->name);
    Tcl_DecrRefCount(rcPtr->methods);
    Tcl_DecrRefCount(rcPtr->cmd);
    ckfree((char*) rcPtr);


    return TCL_ERROR;

#undef MODE
#undef CMD
}
 
/*
................................................................................
	}
#endif

        Tcl_EventuallyFree(rcPtr, (Tcl_FreeProc *) FreeReflectedChannel);
	return EOK;
    }













    /*
     * Are we in the correct thread?
     */

#ifdef TCL_THREADS
    if (rcPtr->thread != Tcl_GetCurrentThread()) {
	ForwardParam p;
................................................................................
        Tcl_EventuallyFree(rcPtr, (Tcl_FreeProc *) FreeReflectedChannel);

	if (result != TCL_OK) {
	    PassReceivedErrorInterp(interp, &p);
	}
    } else {
#endif
	result = InvokeTclMethod(rcPtr, METH_FINAL, NULL, NULL, &resObj);
	if ((result != TCL_OK) && (interp != NULL)) {
	    Tcl_SetChannelErrorInterp(interp, resObj);
	}

	Tcl_DecrRefCount(resObj);	/* Remove reference we held from the
					 * invoke */

................................................................................
{
    ReflectedChannel *rcPtr = clientData;
    Tcl_Obj *toReadObj;
    int bytec;			/* Number of returned bytes */
    unsigned char *bytev;	/* Array of returned bytes */
    Tcl_Obj *resObj;		/* Result data for 'read' */













    /*
     * Are we in the correct thread?
     */

#ifdef TCL_THREADS
    if (rcPtr->thread != Tcl_GetCurrentThread()) {
	ForwardParam p;
................................................................................
    /* ASSERT: rcPtr->mode & TCL_READABLE */

    Tcl_Preserve(rcPtr);

    toReadObj = Tcl_NewIntObj(toRead);
    Tcl_IncrRefCount(toReadObj);

    if (InvokeTclMethod(rcPtr, METH_READ, toReadObj, NULL, &resObj)!=TCL_OK) {
	int code = ErrnoReturn(rcPtr, resObj);

	if (code < 0) {
	    *errorCodePtr = -code;
            goto error;
	}

................................................................................
    int *errorCodePtr)
{
    ReflectedChannel *rcPtr = clientData;
    Tcl_Obj *bufObj;
    Tcl_Obj *resObj;		/* Result data for 'write' */
    int written;













    /*
     * Are we in the correct thread?
     */

#ifdef TCL_THREADS
    if (rcPtr->thread != Tcl_GetCurrentThread()) {
	ForwardParam p;
................................................................................
    /* ASSERT: rcPtr->mode & TCL_WRITABLE */

    Tcl_Preserve(rcPtr);

    bufObj = Tcl_NewByteArrayObj((unsigned char *) buf, toWrite);
    Tcl_IncrRefCount(bufObj);

    if (InvokeTclMethod(rcPtr, METH_WRITE, bufObj, NULL, &resObj) != TCL_OK) {
	int code = ErrnoReturn(rcPtr, resObj);

	if (code < 0) {
	    *errorCodePtr = -code;
            goto error;
	}

................................................................................
    offObj  = Tcl_NewWideIntObj(offset);
    baseObj = Tcl_NewStringObj(
            (seekMode == SEEK_SET) ? "start" :
            (seekMode == SEEK_CUR) ? "current" : "end", -1);
    Tcl_IncrRefCount(offObj);
    Tcl_IncrRefCount(baseObj);

    if (InvokeTclMethod(rcPtr, METH_SEEK, offObj, baseObj, &resObj)!=TCL_OK) {
	Tcl_SetChannelError(rcPtr->chan, resObj);
        goto invalid;
    }

    if (Tcl_GetWideIntFromObj(rcPtr->interp, resObj, &newLoc) != TCL_OK) {
	Tcl_SetChannelError(rcPtr->chan, MarshallError(rcPtr->interp));
        goto invalid;
................................................................................
ReflectWatch(
    ClientData clientData,
    int mask)
{
    ReflectedChannel *rcPtr = clientData;
    Tcl_Obj *maskObj;



    /*
     * We restrict the interest to what the channel can support. IOW there
     * will never be write events for a channel which is not writable.
     * Analoguously for read events and non-readable channels.
     */

    mask &= rcPtr->mode;
................................................................................
    }
#endif

    Tcl_Preserve(rcPtr);

    maskObj = DecodeEventMask(mask);
    /* assert maskObj.refCount == 1 */
    (void) InvokeTclMethod(rcPtr, METH_WATCH, maskObj, NULL, NULL);
    Tcl_DecrRefCount(maskObj);

    Tcl_Release(rcPtr);
}
 
/*
 *----------------------------------------------------------------------
................................................................................
#endif

    blockObj = Tcl_NewBooleanObj(!nonblocking);
    Tcl_IncrRefCount(blockObj);

    Tcl_Preserve(rcPtr);

    if (InvokeTclMethod(rcPtr,METH_BLOCKING,blockObj,NULL,&resObj)!=TCL_OK) {
	Tcl_SetChannelError(rcPtr->chan, resObj);
	errorNum = EINVAL;
    } else {
	errorNum = EOK;
    }

    Tcl_DecrRefCount(blockObj);
................................................................................

    optionObj = Tcl_NewStringObj(optionName, -1);
    valueObj = Tcl_NewStringObj(newValue, -1);

    Tcl_IncrRefCount(optionObj);
    Tcl_IncrRefCount(valueObj);

    result = InvokeTclMethod(rcPtr, METH_CONFIGURE,optionObj,valueObj, &resObj);
    if (result != TCL_OK) {
	UnmarshallErrorResult(interp, resObj);
    }

    Tcl_DecrRefCount(optionObj);
    Tcl_DecrRefCount(valueObj);
    Tcl_DecrRefCount(resObj);		/* Remove reference held from invoke */
................................................................................
     */

    ReflectedChannel *rcPtr = clientData;
    Tcl_Obj *optionObj;
    Tcl_Obj *resObj;		/* Result data for 'configure' */
    int listc, result = TCL_OK;
    Tcl_Obj **listv;
    MethodName method;

    /*
     * Are we in the correct thread?
     */

#ifdef TCL_THREADS
    if (rcPtr->thread != Tcl_GetCurrentThread()) {
................................................................................
#endif

    if (optionName == NULL) {
	/*
	 * Retrieve all options.
	 */

	method = METH_CGETALL;
	optionObj = NULL;
    } else {
	/*
	 * Retrieve the value of one option.
	 */

	method = METH_CGET;
	optionObj = Tcl_NewStringObj(optionName, -1);
        Tcl_IncrRefCount(optionObj);
    }

    Tcl_Preserve(rcPtr);

    if (InvokeTclMethod(rcPtr, method, optionObj, NULL, &resObj)!=TCL_OK) {
................................................................................
NewReflectedChannel(
    Tcl_Interp *interp,
    Tcl_Obj *cmdpfxObj,
    int mode,
    Tcl_Obj *handleObj)
{
    ReflectedChannel *rcPtr;
    MethodName mn = METH_BLOCKING;

    rcPtr = ckalloc(sizeof(ReflectedChannel));

    /* rcPtr->chan: Assigned by caller. Dummy data here. */


    rcPtr->chan = NULL;

    rcPtr->interp = interp;
    rcPtr->dead = 0;
#ifdef TCL_THREADS
    rcPtr->thread = Tcl_GetCurrentThread();
#endif
    rcPtr->mode = mode;
    rcPtr->interest = 0;		/* Initially no interest registered */

    /* ASSERT: cmdpfxObj is a Tcl List */
    rcPtr->cmd = TclListObjCopy(NULL, cmdpfxObj);
    Tcl_IncrRefCount(rcPtr->cmd);
    rcPtr->methods = Tcl_NewListObj(METH_WRITE + 1, NULL);
    while (mn <= METH_WRITE) {
	Tcl_ListObjAppendElement(NULL, rcPtr->methods,
		Tcl_NewStringObj(methodNames[mn++], -1));
    }
    Tcl_IncrRefCount(rcPtr->methods);
    rcPtr->name = handleObj;
    Tcl_IncrRefCount(rcPtr->name);
    return rcPtr;
}
 
/*
 *----------------------------------------------------------------------
 *
 * NextHandle --
................................................................................
	 * Delete a cloned ChannelType structure.
	 */

	ckfree(chanPtr->typePtr);
	chanPtr->typePtr = NULL;
    }
    Tcl_Release(chanPtr);
    Tcl_DecrRefCount(rcPtr->name);
    Tcl_DecrRefCount(rcPtr->methods);
    Tcl_DecrRefCount(rcPtr->cmd);
    ckfree(rcPtr);
}
 
/*
 *----------------------------------------------------------------------
 *
................................................................................
 *
 *----------------------------------------------------------------------
 */

static int
InvokeTclMethod(
    ReflectedChannel *rcPtr,
    MethodName method,
    Tcl_Obj *argOneObj,		/* NULL'able */
    Tcl_Obj *argTwoObj,		/* NULL'able */
    Tcl_Obj **resultObjPtr)	/* NULL'able */
{
    Tcl_Obj *methObj = NULL;	/* Method name in object form */
    Tcl_InterpState sr;		/* State of handler interp */
    int result;			/* Result code of method invokation */
    Tcl_Obj *resObj = NULL;	/* Result of method invokation. */
    Tcl_Obj *cmd;


    if (rcPtr->dead) {
	/*
	 * The channel is marked as dead. Bail out immediately, with an
	 * appropriate error.
	 */

................................................................................
         * Not touching argOneObj, argTwoObj, they have not been used.
         * See the contract as well.
         */

	return TCL_ERROR;
    }







    /*
     * Insert method into the callback command, after the command prefix,
     * before the channel id.
     */


    cmd = TclListObjCopy(NULL, rcPtr->cmd);

    Tcl_ListObjIndex(NULL, rcPtr->methods, method, &methObj);
    Tcl_ListObjAppendElement(NULL, cmd, methObj);
    Tcl_ListObjAppendElement(NULL, cmd, rcPtr->name);

    /*
     * Append the additional argument containing method specific details
     * behind the channel id. If specified.
     *
     * Because of the contract there is no need to increment the refcounts.
     * The objects will survive the Tcl_EvalObjv without change.
................................................................................
			"chan handler returned bad code: %d", result));
		Tcl_LogCommandInfo(rcPtr->interp, cmdString, cmdString,
			cmdLen);
		Tcl_DecrRefCount(cmd);
		result = TCL_ERROR;
	    }
	    Tcl_AppendObjToErrorInfo(rcPtr->interp, Tcl_ObjPrintf(
		    "\n    (chan handler subcommand \"%s\")",
		    methodNames[method]));
	    resObj = MarshallError(rcPtr->interp);
	}
	Tcl_IncrRefCount(resObj);
    }
    Tcl_DecrRefCount(cmd);
    Tcl_RestoreInterpState(rcPtr->interp, sr);
    Tcl_Release(rcPtr->interp);
................................................................................
	 */

    case ForwardedClose:
	/*
	 * No parameters/results.
	 */

	if (InvokeTclMethod(rcPtr, METH_FINAL, NULL, NULL, &resObj)!=TCL_OK) {
	    ForwardSetObjError(paramPtr, resObj);
	}

	/*
	 * Freeing is done here, in the origin thread, callback command
	 * objects belong to this thread. Deallocating them in a different
	 * thread is not allowed
................................................................................
	break;

    case ForwardedInput: {
	Tcl_Obj *toReadObj = Tcl_NewIntObj(paramPtr->input.toRead);
        Tcl_IncrRefCount(toReadObj);

        Tcl_Preserve(rcPtr);
	if (InvokeTclMethod(rcPtr, METH_READ, toReadObj, NULL, &resObj)!=TCL_OK){
	    int code = ErrnoReturn(rcPtr, resObj);

	    if (code < 0) {
		paramPtr->base.code = code;
	    } else {
		ForwardSetObjError(paramPtr, resObj);
	    }
................................................................................

    case ForwardedOutput: {
	Tcl_Obj *bufObj = Tcl_NewByteArrayObj((unsigned char *)
                paramPtr->output.buf, paramPtr->output.toWrite);
        Tcl_IncrRefCount(bufObj);

        Tcl_Preserve(rcPtr);
	if (InvokeTclMethod(rcPtr, METH_WRITE, bufObj, NULL, &resObj) != TCL_OK) {
	    int code = ErrnoReturn(rcPtr, resObj);

	    if (code < 0) {
		paramPtr->base.code = code;
	    } else {
		ForwardSetObjError(paramPtr, resObj);
	    }
................................................................................
                (paramPtr->seek.seekMode==SEEK_SET) ? "start" :
                (paramPtr->seek.seekMode==SEEK_CUR) ? "current" : "end", -1);

        Tcl_IncrRefCount(offObj);
        Tcl_IncrRefCount(baseObj);

        Tcl_Preserve(rcPtr);
	if (InvokeTclMethod(rcPtr, METH_SEEK, offObj, baseObj, &resObj)!=TCL_OK){
	    ForwardSetObjError(paramPtr, resObj);
	    paramPtr->seek.offset = -1;
	} else {
	    /*
	     * Process a regular result. If the type is wrong this may change
	     * into an error.
	     */
................................................................................
    }

    case ForwardedWatch: {
	Tcl_Obj *maskObj = DecodeEventMask(paramPtr->watch.mask);
        /* assert maskObj.refCount == 1 */

        Tcl_Preserve(rcPtr);
	(void) InvokeTclMethod(rcPtr, METH_WATCH, maskObj, NULL, NULL);
	Tcl_DecrRefCount(maskObj);
        Tcl_Release(rcPtr);
	break;
    }

    case ForwardedBlock: {
	Tcl_Obj *blockObj = Tcl_NewBooleanObj(!paramPtr->block.nonblocking);

        Tcl_IncrRefCount(blockObj);
        Tcl_Preserve(rcPtr);
	if (InvokeTclMethod(rcPtr, METH_BLOCKING, blockObj, NULL,
                &resObj) != TCL_OK) {
	    ForwardSetObjError(paramPtr, resObj);
	}
        Tcl_Release(rcPtr);
        Tcl_DecrRefCount(blockObj);
	break;
    }
................................................................................
    case ForwardedSetOpt: {
	Tcl_Obj *optionObj = Tcl_NewStringObj(paramPtr->setOpt.name, -1);
	Tcl_Obj *valueObj  = Tcl_NewStringObj(paramPtr->setOpt.value, -1);

        Tcl_IncrRefCount(optionObj);
        Tcl_IncrRefCount(valueObj);
        Tcl_Preserve(rcPtr);
	if (InvokeTclMethod(rcPtr, METH_CONFIGURE, optionObj, valueObj,
                &resObj) != TCL_OK) {
	    ForwardSetObjError(paramPtr, resObj);
	}
        Tcl_Release(rcPtr);
        Tcl_DecrRefCount(optionObj);
        Tcl_DecrRefCount(valueObj);
	break;
................................................................................
	 * Retrieve the value of one option.
	 */

	Tcl_Obj *optionObj = Tcl_NewStringObj(paramPtr->getOpt.name, -1);

        Tcl_IncrRefCount(optionObj);
        Tcl_Preserve(rcPtr);
	if (InvokeTclMethod(rcPtr, METH_CGET, optionObj, NULL, &resObj)!=TCL_OK){
	    ForwardSetObjError(paramPtr, resObj);
	} else {
	    TclDStringAppendObj(paramPtr->getOpt.value, resObj);
	}
        Tcl_Release(rcPtr);
        Tcl_DecrRefCount(optionObj);
	break;
................................................................................

    case ForwardedGetOptAll:
	/*
	 * Retrieve all options.
	 */

        Tcl_Preserve(rcPtr);
	if (InvokeTclMethod(rcPtr, METH_CGETALL, NULL, NULL, &resObj) != TCL_OK){
	    ForwardSetObjError(paramPtr, resObj);
	} else {
	    /*
	     * Extract list, validate that it is a list, and #elements. See
	     * NOTE (4) as well.
	     */