tcl.git - Tcl is a high-level, general-purpose, interpreted, dynamic programming language. It was designed with the goal of being very simple but powerful.

Tcl is a high-level, general-purpose, interpreted, dynamic programming language. It was designed with the goal of being very simple but powerful.

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/*
 * tclIORChan.c --
 *
 *	This file contains the implementation of Tcl's generic channel
 *	reflection code, which allows the implementation of Tcl channels in
 *	Tcl code.
 *
 *	Parts of this file are based on code contributed by Jean-Claude
 *	Wippler.
 *
 *	See TIP #219 for the specification of this functionality.
 *
 * Copyright (c) 2004-2005 ActiveState, a divison of Sophos
 *
 * See the file "license.terms" for information on usage and redistribution of
 * this file, and for a DISCLAIMER OF ALL WARRANTIES.
 */

#include "tclInt.h"
#include "tclIO.h"
#include <assert.h>

#ifndef EINVAL
#define EINVAL	9
#endif
#ifndef EOK
#define EOK	0
#endif

/*
 * Signatures of all functions used in the C layer of the reflection.
 */

static int		ReflectClose(ClientData clientData,
			    Tcl_Interp *interp);
static int		ReflectInput(ClientData clientData, char *buf,
			    int toRead, int *errorCodePtr);
static int		ReflectOutput(ClientData clientData, const char *buf,
			    int toWrite, int *errorCodePtr);
static void		ReflectWatch(ClientData clientData, int mask);
static int		ReflectBlock(ClientData clientData, int mode);
#ifdef TCL_THREADS
static void		ReflectThread(ClientData clientData, int action);
#endif
static Tcl_WideInt	ReflectSeekWide(ClientData clientData,
			    Tcl_WideInt offset, int mode, int *errorCodePtr);
static int		ReflectSeek(ClientData clientData, long offset,
			    int mode, int *errorCodePtr);
static int		ReflectGetOption(ClientData clientData,
			    Tcl_Interp *interp, const char *optionName,
			    Tcl_DString *dsPtr);
static int		ReflectSetOption(ClientData clientData,
			    Tcl_Interp *interp, const char *optionName,
			    const char *newValue);

/*
 * The C layer channel type/driver definition used by the reflection. This is
 * a version 3 structure.
 */

static const Tcl_ChannelType tclRChannelType = {
    "tclrchannel",	   /* Type name.				  */
    TCL_CHANNEL_VERSION_5, /* v5 channel */
    ReflectClose,	   /* Close channel, clean instance data	  */
    ReflectInput,	   /* Handle read request			  */
    ReflectOutput,	   /* Handle write request			  */
    ReflectSeek,	   /* Move location of access point.	NULL'able */
    ReflectSetOption,	   /* Set options.			NULL'able */
    ReflectGetOption,	   /* Get options.			NULL'able */
    ReflectWatch,	   /* Initialize notifier			  */
    NULL,		   /* Get OS handle from the channel.	NULL'able */
    NULL,		   /* No close2 support.		NULL'able */
    ReflectBlock,	   /* Set blocking/nonblocking.		NULL'able */
    NULL,		   /* Flush channel. Not used by core.	NULL'able */
    NULL,		   /* Handle events.			NULL'able */
    ReflectSeekWide,	   /* Move access point (64 bit).	NULL'able */
#ifdef TCL_THREADS
    ReflectThread,         /* thread action, tracking owner */
#else
    NULL,		   /* thread action */
#endif
    NULL		   /* truncate */
};

/*
 * Instance data for a reflected channel. ===========================
 */

typedef struct {
    Tcl_Channel chan;		/* Back reference to generic channel
				 * structure. */
    Tcl_Interp *interp;		/* Reference to the interpreter containing the
				 * Tcl level part of the channel. NULL here
				 * signals the channel is dead because the
				 * interpreter/thread containing its Tcl
				 * 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. */

    /*
     * Note regarding the usage of timers.
     *
     * Most channel implementations need a timer in the C level to ensure that
     * data in buffers is flushed out through the generation of fake file
     * events.
     *
     * See 'rechan', 'memchan', etc.
     *
     * Here this is _not_ required. Interest in events is posted to the Tcl
     * level via 'watch'. And posting of events is possible from the Tcl level
     * as well, via 'chan postevent'. This means that the generation of all
     * events, fake or not, timer based or not, is completely in the hands of
     * the Tcl level. Therefore no timer here.
     */
} ReflectedChannel;

/*
 * Structure of the table maping from channel handles to reflected
 * channels. Each interpreter which has the handler command for one or more
 * reflected channels records them in such a table, so that 'chan postevent'
 * is able to find them even if the actual channel was moved to a different
 * interpreter and/or thread.
 *
 * The table is reachable via the standard interpreter AssocData, the key is
 * defined below.
 */

typedef struct {
    Tcl_HashTable map;
} ReflectedChannelMap;

#define RCMKEY "ReflectedChannelMap"

/*
 * Event literals. ==================================================
 */

static const char *const eventOptions[] = {
    "read", "write", NULL
};
typedef enum {
    EVENT_READ, EVENT_WRITE
} EventOption;

/*
 * Method literals. ==================================================
 */

static const char *const methodNames[] = {
    "blocking",		/* OPT */
    "cget",		/* OPT \/ Together or none */
    "cgetall",		/* OPT /\ of these two     */
    "configure",	/* OPT */
    "finalize",		/*     */
    "initialize",	/*     */
    "read",		/* OPT */
    "seek",		/* OPT */
    "watch",		/*     */
    "write",		/* OPT */
    NULL
};
typedef enum {
    METH_BLOCKING,
    METH_CGET,
    METH_CGETALL,
    METH_CONFIGURE,
    METH_FINAL,
    METH_INIT,
    METH_READ,
    METH_SEEK,
    METH_WATCH,
    METH_WRITE
} MethodName;

#define FLAG(m) (1 << (m))
#define REQUIRED_METHODS \
	(FLAG(METH_INIT) | FLAG(METH_FINAL) | FLAG(METH_WATCH))
#define NULLABLE_METHODS \
	(FLAG(METH_BLOCKING) | FLAG(METH_SEEK) | \
	FLAG(METH_CONFIGURE) | FLAG(METH_CGET) | FLAG(METH_CGETALL))

#define RANDW \
	(TCL_READABLE | TCL_WRITABLE)

#define IMPLIES(a,b)	((!(a)) || (b))
#define NEGIMPL(a,b)
#define HAS(x,f)	(x & FLAG(f))

#ifdef TCL_THREADS
/*
 * Thread specific types and structures.
 *
 * We are here essentially creating a very specific implementation of 'thread
 * send'.
 */

/*
 * Enumeration of all operations which can be forwarded.
 */

typedef enum {
    ForwardedClose,
    ForwardedInput,
    ForwardedOutput,
    ForwardedSeek,
    ForwardedWatch,
    ForwardedBlock,
    ForwardedSetOpt,
    ForwardedGetOpt,
    ForwardedGetOptAll
} ForwardedOperation;

/*
 * Event used to forward driver invocations to the thread actually managing
 * the channel. We cannot construct the command to execute and forward that.
 * Because then it will contain a mixture of Tcl_Obj's belonging to both the
 * command handler thread (CT), and the thread managing the channel (MT),
 * executed in CT. Tcl_Obj's are not allowed to cross thread boundaries. So we
 * forward an operation code, the argument details, and reference to results.
 * The command is assembled in the CT and belongs fully to that thread. No
 * sharing problems.
 */

typedef struct {
    int code;			/* O: Ok/Fail of the cmd handler */
    char *msgStr;		/* O: Error message for handler failure */
    int mustFree;		/* O: True if msgStr is allocated, false if
				 * otherwise (static). */
} ForwardParamBase;

/*
 * Operation specific parameter/result structures. (These are "subtypes" of
 * ForwardParamBase. Where an operation does not need any special types, it
 * has no "subtype" and just uses ForwardParamBase, as listed above.)
 */

struct ForwardParamInput {
    ForwardParamBase base;	/* "Supertype". MUST COME FIRST. */
    char *buf;			/* O: Where to store the read bytes */
    int toRead;			/* I: #bytes to read,
				 * O: #bytes actually read */
};
struct ForwardParamOutput {
    ForwardParamBase base;	/* "Supertype". MUST COME FIRST. */
    const char *buf;		/* I: Where the bytes to write come from */
    int toWrite;		/* I: #bytes to write,
				 * O: #bytes actually written */
};
struct ForwardParamSeek {
    ForwardParamBase base;	/* "Supertype". MUST COME FIRST. */
    int seekMode;		/* I: How to seek */
    Tcl_WideInt offset;		/* I: Where to seek,
				 * O: New location */
};
struct ForwardParamWatch {
    ForwardParamBase base;	/* "Supertype". MUST COME FIRST. */
    int mask;			/* I: What events to watch for */
};
struct ForwardParamBlock {
    ForwardParamBase base;	/* "Supertype". MUST COME FIRST. */
    int nonblocking;		/* I: What mode to activate */
};
struct ForwardParamSetOpt {
    ForwardParamBase base;	/* "Supertype". MUST COME FIRST. */
    const char *name;		/* Name of option to set */
    const char *value;		/* Value to set */
};
struct ForwardParamGetOpt {
    ForwardParamBase base;	/* "Supertype". MUST COME FIRST. */
    const char *name;		/* Name of option to get, maybe NULL */
    Tcl_DString *value;		/* Result */
};

/*
 * Now join all these together in a single union for convenience.
 */

typedef union ForwardParam {
    ForwardParamBase base;
    struct ForwardParamInput input;
    struct ForwardParamOutput output;
    struct ForwardParamSeek seek;
    struct ForwardParamWatch watch;
    struct ForwardParamBlock block;
    struct ForwardParamSetOpt setOpt;
    struct ForwardParamGetOpt getOpt;
} ForwardParam;

/*
 * Forward declaration.
 */

typedef struct ForwardingResult ForwardingResult;

/*
 * General event structure, with reference to operation specific data.
 */

typedef struct {
    Tcl_Event event;		/* Basic event data, has to be first item */
    ForwardingResult *resultPtr;
    ForwardedOperation op;	/* Forwarded driver operation */
    ReflectedChannel *rcPtr;	/* Channel instance */
    ForwardParam *param;	/* Packaged arguments and return values, a
				 * ForwardParam pointer. */
} ForwardingEvent;

/*
 * Structure to manage the result of the forwarding. This is not the result of
 * the operation itself, but about the success of the forward event itself.
 * The event can be successful, even if the operation which was forwarded
 * failed. It is also there to manage the synchronization between the involved
 * threads.
 */

struct ForwardingResult {
    Tcl_ThreadId src;		/* Originating thread. */
    Tcl_ThreadId dst;		/* Thread the op was forwarded to. */
    Tcl_Interp *dsti;		/* Interpreter in the thread the op was
				 * forwarded to. */
    /*
     * Note regarding 'dsti' above: Its information is also available via the
     * chain evPtr->rcPtr->interp, however, as can be seen, two more
     * indirections are needed to retrieve it. And the evPtr may be gone,
     * breaking the chain.
     */
    Tcl_Condition done;		/* Condition variable the forwarder blocks
				 * on. */
    int result;			/* TCL_OK or TCL_ERROR */
    ForwardingEvent *evPtr;	/* Event the result belongs to. */
    ForwardingResult *prevPtr, *nextPtr;
				/* Links into the list of pending forwarded
				 * results. */
};

typedef struct {
    /*
     * Table of all reflected channels owned by this thread. This is the
     * per-thread version of the per-interpreter map.
     */

    ReflectedChannelMap *rcmPtr;
} ThreadSpecificData;

static Tcl_ThreadDataKey dataKey;

/*
 * List of forwarded operations which have not completed yet, plus the mutex
 * to protect the access to this process global list.
 */

static ForwardingResult *forwardList = NULL;
TCL_DECLARE_MUTEX(rcForwardMutex)

/*
 * Function containing the generic code executing a forward, and wrapper
 * macros for the actual operations we wish to forward. Uses ForwardProc as
 * the event function executed by the thread receiving a forwarding event
 * (which executes the appropriate function and collects the result, if any).
 *
 * The ExitProc ensures that things do not deadlock when the sending thread
 * involved in the forwarding exits. It also clean things up so that we don't
 * leak resources when threads go away.
 */

static void		ForwardOpToHandlerThread(ReflectedChannel *rcPtr,
			    ForwardedOperation op, const void *param);
static int		ForwardProc(Tcl_Event *evPtr, int mask);
static void		SrcExitProc(ClientData clientData);

#define FreeReceivedError(p) \
	if ((p)->base.mustFree) {                               \
	    ckfree((p)->base.msgStr);                           \
	}
#define PassReceivedErrorInterp(i,p) \
	if ((i) != NULL) {                                      \
	    Tcl_SetChannelErrorInterp((i),                      \
		    Tcl_NewStringObj((p)->base.msgStr, -1));    \
	}                                                       \
	FreeReceivedError(p)
#define PassReceivedError(c,p) \
	Tcl_SetChannelError((c), Tcl_NewStringObj((p)->base.msgStr, -1)); \
	FreeReceivedError(p)
#define ForwardSetStaticError(p,emsg) \
	(p)->base.code = TCL_ERROR;                             \
	(p)->base.mustFree = 0;                                 \
	(p)->base.msgStr = (char *) (emsg)
#define ForwardSetDynamicError(p,emsg) \
	(p)->base.code = TCL_ERROR;                             \
	(p)->base.mustFree = 1;                                 \
	(p)->base.msgStr = (char *) (emsg)

static void		ForwardSetObjError(ForwardParam *p, Tcl_Obj *objPtr);

static ReflectedChannelMap *	GetThreadReflectedChannelMap(void);
static void		DeleteThreadReflectedChannelMap(ClientData clientData);

#endif /* TCL_THREADS */

#define SetChannelErrorStr(c,msgStr) \
	Tcl_SetChannelError((c), Tcl_NewStringObj((msgStr), -1))

static Tcl_Obj *	MarshallError(Tcl_Interp *interp);
static void		UnmarshallErrorResult(Tcl_Interp *interp,
			    Tcl_Obj *msgObj);

/*
 * Static functions for this file:
 */

static int		EncodeEventMask(Tcl_Interp *interp,
			    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);
static void		MarkDead(ReflectedChannel *rcPtr);

/*
 * 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}";
#endif /* TCL_THREADS */
static const char *msg_send_dstlost    = "{Owner lost}";
static const char *msg_dstlost    = "-code 1 -level 0 -errorcode NONE -errorinfo {} -errorline 1 {Owner lost}";

/*
 * Main methods to plug into the 'chan' ensemble'. ==================
 */

/*
 *----------------------------------------------------------------------
 *
 * TclChanCreateObjCmd --
 *
 *	This function is invoked to process the "chan create" Tcl command.
 *	See the user documentation for details on what it does.
 *
 * Results:
 *	A standard Tcl result. The handle of the new channel is placed in the
 *	interp result.
 *
 * Side effects:
 *	Creates a new channel.
 *
 *----------------------------------------------------------------------
 */

int
TclChanCreateObjCmd(
    ClientData clientData,
    Tcl_Interp *interp,
    int objc,
    Tcl_Obj *const *objv)
{
    ReflectedChannel *rcPtr;	/* Instance data of the new channel */
    Tcl_Obj *rcId;		/* Handle of the new channel */
    int mode;			/* R/W mode of new channel. Has to match
				 * abilities of handler commands */
    Tcl_Obj *cmdObj;		/* Command prefix, list of words */
    Tcl_Obj *cmdNameObj;	/* Command name */
    Tcl_Channel chan;		/* Token for the new channel */
    Tcl_Obj *modeObj;		/* mode in obj form for method call */
    int listc;			/* Result of 'initialize', and of */
    Tcl_Obj **listv;		/* its sublist in the 2nd element */
    int methIndex;		/* Encoded method name */
    int result;			/* Result code for 'initialize' */
    Tcl_Obj *resObj;		/* Result data for 'initialize' */
    int methods;		/* Bitmask for supported methods. */
    Channel *chanPtr;		/* 'chan' resolved to internal struct. */
    Tcl_Obj *err;		/* Error message */
    ReflectedChannelMap *rcmPtr;
				/* Map of reflected channels with handlers in
				 * this interp. */
    Tcl_HashEntry *hPtr;	/* Entry in the above map */
    int isNew;			/* Placeholder. */

    /*
     * Syntax:   chan create MODE CMDPREFIX
     *           [0]  [1]    [2]  [3]
     *
     * Actually: rCreate MODE CMDPREFIX
     *           [0]     [1]  [2]
     */

#define MODE	(1)
#define CMD	(2)

    /*
     * Number of arguments...
     */

    if (objc != 3) {
	Tcl_WrongNumArgs(interp, 1, objv, "mode cmdprefix");
	return TCL_ERROR;
    }

    /*
     * First argument is a list of modes. Allowed entries are "read", "write".
     * Expect at least one list element. Abbreviations are ok.
     */

    modeObj = objv[MODE];
    if (EncodeEventMask(interp, "mode", objv[MODE], &mode) != TCL_OK) {
	return TCL_ERROR;
    }

    /*
     * Second argument is command prefix, i.e. list of words, first word is
     * name of handler command, other words are fixed arguments. Run the
     * 'initialize' method to get the list of supported methods. Validate
     * this.
     */

    cmdObj = objv[CMD];

    /*
     * Basic check that the command prefix truly is a list.
     */

    if (Tcl_ListObjIndex(interp, cmdObj, 0, &cmdNameObj) != TCL_OK) {
	return TCL_ERROR;
    }

    /*
     * 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;
    }

    /*
     * Verify the result.
     * - List, of method names. Convert to mask.
     *   Check for non-optionals through the mask.
     *   Compare open mode against optional r/w.
     */

    if (Tcl_ListObjGetElements(NULL, resObj, &listc, &listv) != TCL_OK) {
        Tcl_SetObjResult(interp, Tcl_ObjPrintf(
                "chan handler \"%s initialize\" returned non-list: %s",
                TclGetString(cmdObj), TclGetString(resObj)));
	Tcl_DecrRefCount(resObj);
	goto error;
    }

    methods = 0;
    while (listc > 0) {
	if (Tcl_GetIndexFromObj(interp, listv[listc-1], methodNames,
		"method", TCL_EXACT, &methIndex) != TCL_OK) {
	    TclNewLiteralStringObj(err, "chan handler \"");
	    Tcl_AppendObjToObj(err, cmdObj);
	    Tcl_AppendToObj(err, " initialize\" returned ", -1);
	    Tcl_AppendObjToObj(err, Tcl_GetObjResult(interp));
	    Tcl_SetObjResult(interp, err);
	    Tcl_DecrRefCount(resObj);
	    goto error;
	}

	methods |= FLAG(methIndex);
	listc--;
    }
    Tcl_DecrRefCount(resObj);

    if ((REQUIRED_METHODS & methods) != REQUIRED_METHODS) {
        Tcl_SetObjResult(interp, Tcl_ObjPrintf(
                "chan handler \"%s\" does not support all required methods",
                TclGetString(cmdObj)));
	goto error;
    }

    if ((mode & TCL_READABLE) && !HAS(methods, METH_READ)) {
        Tcl_SetObjResult(interp, Tcl_ObjPrintf(
                "chan handler \"%s\" lacks a \"read\" method",
                TclGetString(cmdObj)));
	goto error;
    }

    if ((mode & TCL_WRITABLE) && !HAS(methods, METH_WRITE)) {
        Tcl_SetObjResult(interp, Tcl_ObjPrintf(
                "chan handler \"%s\" lacks a \"write\" method",
                TclGetString(cmdObj)));
	goto error;
    }

    if (!IMPLIES(HAS(methods, METH_CGET), HAS(methods, METH_CGETALL))) {
        Tcl_SetObjResult(interp, Tcl_ObjPrintf(
                "chan handler \"%s\" supports \"cget\" but not \"cgetall\"",
                TclGetString(cmdObj)));
	goto error;
    }

    if (!IMPLIES(HAS(methods, METH_CGETALL), HAS(methods, METH_CGET))) {
        Tcl_SetObjResult(interp, Tcl_ObjPrintf(
                "chan handler \"%s\" supports \"cgetall\" but not \"cget\"",
                TclGetString(cmdObj)));
	goto error;
    }

    Tcl_ResetResult(interp);

    /*
     * Everything is fine now.
     */

    chan = Tcl_CreateChannel(&tclRChannelType, TclGetString(rcId), rcPtr,
	    mode);
    rcPtr->chan = chan;
    TclChannelPreserve(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_ChannelType *clonePtr = ckalloc(sizeof(Tcl_ChannelType));

	memcpy(clonePtr, &tclRChannelType, sizeof(Tcl_ChannelType));

	if (!(methods & FLAG(METH_CONFIGURE))) {
	    clonePtr->setOptionProc = NULL;
	}

	if (!(methods & FLAG(METH_CGET)) && !(methods & FLAG(METH_CGETALL))) {
	    clonePtr->getOptionProc = NULL;
	}
	if (!(methods & FLAG(METH_BLOCKING))) {
	    clonePtr->blockModeProc = NULL;
	}
	if (!(methods & FLAG(METH_SEEK))) {
	    clonePtr->seekProc = NULL;
	    clonePtr->wideSeekProc = NULL;
	}

	chanPtr->typePtr = clonePtr;
    }

    /*
     * Register the channel in the I/O system, and in our our map for 'chan
     * postevent'.
     */

    Tcl_RegisterChannel(interp, chan);

    rcmPtr = GetReflectedChannelMap(interp);
    hPtr = Tcl_CreateHashEntry(&rcmPtr->map, chanPtr->state->channelName,
	    &isNew);
    if (!isNew && chanPtr != Tcl_GetHashValue(hPtr)) {
	Tcl_Panic("TclChanCreateObjCmd: duplicate channel names");
    }
    Tcl_SetHashValue(hPtr, chan);
#ifdef TCL_THREADS
    rcmPtr = GetThreadReflectedChannelMap();
    hPtr = Tcl_CreateHashEntry(&rcmPtr->map, chanPtr->state->channelName,
	    &isNew);
    Tcl_SetHashValue(hPtr, chan);
#endif

    /*
     * Return handle as result of command.
     */

    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(rcPtr);
    return TCL_ERROR;

#undef MODE
#undef CMD
}

/*
 *----------------------------------------------------------------------
 *
 * TclChanPostEventObjCmd --
 *
 *	This function is invoked to process the "chan postevent" Tcl command.
 *	See the user documentation for details on what it does.
 *
 * Results:
 *	A standard Tcl result.
 *
 * Side effects:
 *	Posts events to a reflected channel, invokes event handlers. The
 *	latter implies that arbitrary side effects are possible.
 *
 *----------------------------------------------------------------------
 */

typedef struct {
    Tcl_Event header;
    ReflectedChannel *rcPtr;
    int events;
} ReflectEvent;

static int
ReflectEventRun(
    Tcl_Event *ev,
    int flags)
{
    /* OWNER thread
     *
     * Note: When the channel is closed any pending events of this type are
     * deleted. See ReflectClose() for the Tcl_DeleteEvents() calls
     * accomplishing that.
     */

    ReflectEvent *e = (ReflectEvent *) ev;

    Tcl_NotifyChannel(e->rcPtr->chan, e->events);
    return 1;
}

static int
ReflectEventDelete(
    Tcl_Event *ev,
    ClientData cd)
{
    /* OWNER thread
     *
     * Invoked by DeleteThreadReflectedChannelMap() and ReflectClose(). The
     * latter ensures that no pending events of this type are run on an
     * invalid channel.
     */

    ReflectEvent *e = (ReflectEvent *) ev;

    if ((ev->proc != ReflectEventRun) || ((cd != NULL) && (cd != e->rcPtr))) {
        return 0;
    }
    return 1;
}

int
TclChanPostEventObjCmd(
    ClientData clientData,
    Tcl_Interp *interp,
    int objc,
    Tcl_Obj *const *objv)
{
    /*
     * Ensure -> HANDLER thread
     *
     * Syntax:   chan postevent CHANNEL EVENTSPEC
     *           [0]  [1]       [2]     [3]
     *
     * Actually: rPostevent CHANNEL EVENTSPEC
     *           [0]        [1]     [2]
     *
     * where EVENTSPEC = {read write ...} (Abbreviations allowed as well).
     */

#define CHAN	(1)
#define EVENT	(2)

    const char *chanId;		/* Tcl level channel handle */
    Tcl_Channel chan;		/* Channel associated to the handle */
    const Tcl_ChannelType *chanTypePtr;
				/* Its associated driver structure */
    ReflectedChannel *rcPtr;	/* Associated instance data */
    int events;			/* Mask of events to post */
    ReflectedChannelMap *rcmPtr;/* Map of reflected channels with handlers in
				 * this interp. */
    Tcl_HashEntry *hPtr;	/* Entry in the above map */

    /*
     * Number of arguments...
     */

    if (objc != 3) {
	Tcl_WrongNumArgs(interp, 1, objv, "channel eventspec");
	return TCL_ERROR;
    }

    /*
     * First argument is a channel, a reflected channel, and the call of this
     * command is done from the interp defining the channel handler cmd.
     */

    chanId = TclGetString(objv[CHAN]);

    rcmPtr = GetReflectedChannelMap(interp);
    hPtr = Tcl_FindHashEntry(&rcmPtr->map, chanId);

    if (hPtr == NULL) {
	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
                "can not find reflected channel named \"%s\"", chanId));
	Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "CHANNEL", chanId, NULL);
	return TCL_ERROR;
    }

    /*
     * Note that the search above subsumes several of the older checks,
     * namely:
     *
     * (1) Does the channel handle refer to a reflected channel?
     * (2) Is the post event issued from the interpreter holding the handler
     *     of the reflected channel?
     *
     * A successful search answers yes to both. Because the map holds only
     * handles of reflected channels, and only of such whose handler is
     * defined in this interpreter.
     *
     * We keep the old checks for both, for paranioa, but abort now instead of
     * throwing errors, as failure now means that our internal datastructures
     * have gone seriously haywire.
     */

    chan = Tcl_GetHashValue(hPtr);
    chanTypePtr = Tcl_GetChannelType(chan);

    /*
     * We use a function referenced by the channel type as our cookie to
     * detect calls to non-reflecting channels. The channel type itself is not
     * suitable, as it might not be the static definition in this file, but a
     * clone thereof. And while we have reserved the name of the type nothing
     * in the core checks against violation, so someone else might have
     * created a channel type using our name, clashing with ourselves.
     */

    if (chanTypePtr->watchProc != &ReflectWatch) {
	Tcl_Panic("TclChanPostEventObjCmd: channel is not a reflected channel");
    }

    rcPtr = Tcl_GetChannelInstanceData(chan);

    if (rcPtr->interp != interp) {
	Tcl_Panic("TclChanPostEventObjCmd: postevent accepted for call from outside interpreter");
    }

    /*
     * Second argument is a list of events. Allowed entries are "read",
     * "write". Expect at least one list element. Abbreviations are ok.
     */

    if (EncodeEventMask(interp, "event", objv[EVENT], &events) != TCL_OK) {
	return TCL_ERROR;
    }

    /*
     * Check that the channel is actually interested in the provided events.
     */

    if (events & ~rcPtr->interest) {
	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
                "tried to post events channel \"%s\" is not interested in",
                chanId));
	return TCL_ERROR;
    }

    /*
     * We have the channel and the events to post.
     */

#ifdef TCL_THREADS
    if (rcPtr->owner == rcPtr->thread) {
#endif
        Tcl_NotifyChannel(chan, events);
#ifdef TCL_THREADS
    } else {
        ReflectEvent *ev = ckalloc(sizeof(ReflectEvent));

        ev->header.proc = ReflectEventRun;
        ev->events = events;
        ev->rcPtr = rcPtr;

        /*
         * We are not preserving the structure here. When the channel is
         * closed any pending events are deleted, see ReflectClose(), and
         * ReflectEventDelete(). Trying to preserve and later release when the
         * event is run may generate a situation where the channel structure
         * is deleted but not our structure, crashing in
         * FreeReflectedChannel().
         *
         * Force creation of the RCM, for proper cleanup on thread teardown.
         * The teardown of unprocessed events is currently coupled to the
         * thread reflected channel map
         */

        (void) GetThreadReflectedChannelMap();

        /*
         * XXX Race condition !!
         * XXX The destination thread may not exist anymore already.
         * XXX (Delayed postevent executed after channel got removed).
         * XXX Can we detect this ? (check the validity of the owner threadid ?)
         * XXX Actually, in that case the channel should be dead also !
         */

        Tcl_ThreadQueueEvent(rcPtr->owner, (Tcl_Event *) ev, TCL_QUEUE_TAIL);
        Tcl_ThreadAlert(rcPtr->owner);
    }
#endif

    /*
     * Squash interp results left by the event script.
     */

    Tcl_ResetResult(interp);
    return TCL_OK;

#undef CHAN
#undef EVENT
}

/*
 * Channel error message marshalling utilities.
 */

static Tcl_Obj *
MarshallError(
    Tcl_Interp *interp)
{
    /*
     * Capture the result status of the interpreter into a string. => List of
     * options and values, followed by the error message. The result has
     * refCount 0.
     */

    Tcl_Obj *returnOpt = Tcl_GetReturnOptions(interp, TCL_ERROR);

    /*
     * => returnOpt.refCount == 0. We can append directly.
     */

    Tcl_ListObjAppendElement(NULL, returnOpt, Tcl_GetObjResult(interp));
    return returnOpt;
}

static void
UnmarshallErrorResult(
    Tcl_Interp *interp,
    Tcl_Obj *msgObj)
{
    int lc;
    Tcl_Obj **lv;
    int explicitResult;
    int numOptions;

    /*
     * Process the caught message.
     *
     * Syntax = (option value)... ?message?
     *
     * Bad syntax causes a panic. This is OK because the other side uses
     * Tcl_GetReturnOptions and list construction functions to marshall the
     * information; if we panic here, something has gone badly wrong already.
     */

    if (Tcl_ListObjGetElements(interp, msgObj, &lc, &lv) != TCL_OK) {
	Tcl_Panic("TclChanCaughtErrorBypass: Bad syntax of caught result");
    }
    if (interp == NULL) {
	return;
    }

    explicitResult = lc & 1;		/* Odd number of values? */
    numOptions = lc - explicitResult;

    if (explicitResult) {
	Tcl_SetObjResult(interp, lv[lc-1]);
    }

    (void) Tcl_SetReturnOptions(interp, Tcl_NewListObj(numOptions, lv));
    ((Interp *) interp)->flags &= ~ERR_ALREADY_LOGGED;
}

int
TclChanCaughtErrorBypass(
    Tcl_Interp *interp,
    Tcl_Channel chan)
{
    Tcl_Obj *chanMsgObj = NULL;
    Tcl_Obj *interpMsgObj = NULL;
    Tcl_Obj *msgObj = NULL;

    /*
     * Get a bypassed error message from channel and/or interpreter, save the
     * reference, then kill the returned objects, if there were any. If there
     * are messages in both the channel has preference.
     */

    if ((chan == NULL) && (interp == NULL)) {
	return 0;
    }

    if (chan != NULL) {
	Tcl_GetChannelError(chan, &chanMsgObj);
    }
    if (interp != NULL) {
	Tcl_GetChannelErrorInterp(interp, &interpMsgObj);
    }

    if (chanMsgObj != NULL) {
	msgObj = chanMsgObj;
    } else if (interpMsgObj != NULL) {
	msgObj = interpMsgObj;
    }
    if (msgObj != NULL) {
	Tcl_IncrRefCount(msgObj);
    }

    if (chanMsgObj != NULL) {
	Tcl_DecrRefCount(chanMsgObj);
    }
    if (interpMsgObj != NULL) {
	Tcl_DecrRefCount(interpMsgObj);
    }

    /*
     * No message returned, nothing caught.
     */

    if (msgObj == NULL) {
	return 0;
    }

    UnmarshallErrorResult(interp, msgObj);

    Tcl_DecrRefCount(msgObj);
    return 1;
}

/*
 * Driver functions. ================================================
 */

/*
 *----------------------------------------------------------------------
 *
 * ReflectClose --
 *
 *	This function is invoked when the channel is closed, to delete the
 *	driver specific instance data.
 *
 * Results:
 *	A posix error.
 *
 * Side effects:
 *	Releases memory. Arbitrary, as it calls upon a script.
 *
 *----------------------------------------------------------------------
 */

static int
ReflectClose(
    ClientData clientData,
    Tcl_Interp *interp)
{
    ReflectedChannel *rcPtr = clientData;
    int result;			/* Result code for 'close' */
    Tcl_Obj *resObj;		/* Result data for 'close' */
    ReflectedChannelMap *rcmPtr;/* Map of reflected channels with handlers in
				 * this interp */
    Tcl_HashEntry *hPtr;	/* Entry in the above map */
    const Tcl_ChannelType *tctPtr;

    if (TclInThreadExit()) {
	/*
	 * This call comes from TclFinalizeIOSystem. There are no
	 * interpreters, and therefore we cannot call upon the handler command
	 * anymore. Threading is irrelevant as well. We simply clean up all
	 * our C level data structures and leave the Tcl level to the other
	 * finalization functions.
	 */

	/*
	 * THREADED => Forward this to the origin thread
	 *
	 * Note: DeleteThreadReflectedChannelMap() is the thread exit handler
	 * for the origin thread. Use this to clean up the structure? Except
	 * if lost?
	 */

#ifdef TCL_THREADS
	if (rcPtr->thread != Tcl_GetCurrentThread()) {
	    ForwardParam p;

	    ForwardOpToHandlerThread(rcPtr, ForwardedClose, &p);
	    result = p.base.code;

            /*
             * Now squash the pending reflection events for this channel.
             */

            Tcl_DeleteEvents(ReflectEventDelete, rcPtr);

	    if (result != TCL_OK) {
		FreeReceivedError(&p);
	    }
	}
#endif

	tctPtr = ((Channel *)rcPtr->chan)->typePtr;
	if (tctPtr && tctPtr != &tclRChannelType) {
	    ckfree(tctPtr);
	    ((Channel *)rcPtr->chan)->typePtr = NULL;
	}
        Tcl_EventuallyFree(rcPtr, (Tcl_FreeProc *) FreeReflectedChannel);
	return EOK;
    }

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

#ifdef TCL_THREADS
    if (rcPtr->thread != Tcl_GetCurrentThread()) {
	ForwardParam p;

	ForwardOpToHandlerThread(rcPtr, ForwardedClose, &p);
	result = p.base.code;

        /*
         * Now squash the pending reflection events for this channel.
         */

        Tcl_DeleteEvents(ReflectEventDelete, rcPtr);

	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 */

	/*
	 * Remove the channel from the map before releasing the memory, to
	 * prevent future accesses (like by 'postevent') from finding and
	 * dereferencing a dangling pointer.
	 *
	 * NOTE: The channel may not be in the map. This is ok, that happens
	 * when the channel was created in a different interpreter and/or
	 * thread and then was moved here.
	 *
	 * NOTE: The channel may have been removed from the map already via
	 * the per-interp DeleteReflectedChannelMap exit-handler.
	 */

	if (!rcPtr->dead) {
	    rcmPtr = GetReflectedChannelMap(rcPtr->interp);
	    hPtr = Tcl_FindHashEntry(&rcmPtr->map,
		    Tcl_GetChannelName(rcPtr->chan));
	    if (hPtr) {
		Tcl_DeleteHashEntry(hPtr);
	    }
	}
#ifdef TCL_THREADS
	rcmPtr = GetThreadReflectedChannelMap();
	hPtr = Tcl_FindHashEntry(&rcmPtr->map,
		Tcl_GetChannelName(rcPtr->chan));
	if (hPtr) {
	    Tcl_DeleteHashEntry(hPtr);
	}
    }
#endif
    tctPtr = ((Channel *)rcPtr->chan)->typePtr;
    if (tctPtr && tctPtr != &tclRChannelType) {
	ckfree(tctPtr);
	((Channel *)rcPtr->chan)->typePtr = NULL;
    }
    Tcl_EventuallyFree(rcPtr, (Tcl_FreeProc *) FreeReflectedChannel);
    return (result == TCL_OK) ? EOK : EINVAL;
}

/*
 *----------------------------------------------------------------------
 *
 * ReflectInput --
 *
 *	This function is invoked when more data is requested from the channel.
 *
 * Results:
 *	The number of bytes read.
 *
 * Side effects:
 *	Allocates memory. Arbitrary, as it calls upon a script.
 *
 *----------------------------------------------------------------------
 */

static int
ReflectInput(
    ClientData clientData,
    char *buf,
    int toRead,
    int *errorCodePtr)
{
    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;

	p.input.buf = buf;
	p.input.toRead = toRead;

	ForwardOpToHandlerThread(rcPtr, ForwardedInput, &p);

	if (p.base.code != TCL_OK) {
	    if (p.base.code < 0) {
		/*
                 * No error message, this is an errno signal.
                 */

		*errorCodePtr = -p.base.code;
	    } else {
		PassReceivedError(rcPtr->chan, &p);
		*errorCodePtr = EINVAL;
	    }
	    p.input.toRead = -1;
	} else {
	    *errorCodePtr = EOK;
	}

	return p.input.toRead;
    }
#endif

    /* ASSERT: rcPtr->method & FLAG(METH_READ) */
    /* 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;
	}

	Tcl_SetChannelError(rcPtr->chan, resObj);
        goto invalid;
    }

    bytev = Tcl_GetByteArrayFromObj(resObj, &bytec);

    if (toRead < bytec) {
	SetChannelErrorStr(rcPtr->chan, msg_read_toomuch);
        goto invalid;
    }

    *errorCodePtr = EOK;

    if (bytec > 0) {
	memcpy(buf, bytev, (size_t) bytec);
    }

 stop:
    Tcl_DecrRefCount(toReadObj);
    Tcl_DecrRefCount(resObj);		/* Remove reference held from invoke */
    Tcl_Release(rcPtr);
    return bytec;
 invalid:
    *errorCodePtr = EINVAL;
 error:
    bytec = -1;
    goto stop;
}

/*
 *----------------------------------------------------------------------
 *
 * ReflectOutput --
 *
 *	This function is invoked when data is writen to the channel.
 *
 * Results:
 *	The number of bytes actually written.
 *
 * Side effects:
 *	Allocates memory. Arbitrary, as it calls upon a script.
 *
 *----------------------------------------------------------------------
 */

static int
ReflectOutput(
    ClientData clientData,
    const char *buf,
    int toWrite,
    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;

	p.output.buf = buf;
	p.output.toWrite = toWrite;

	ForwardOpToHandlerThread(rcPtr, ForwardedOutput, &p);

	if (p.base.code != TCL_OK) {
	    if (p.base.code < 0) {
		/*
                 * No error message, this is an errno signal.
                 */

		*errorCodePtr = -p.base.code;
	    } else {
                PassReceivedError(rcPtr->chan, &p);
                *errorCodePtr = EINVAL;
            }
	    p.output.toWrite = -1;
	} else {
	    *errorCodePtr = EOK;
	}

	return p.output.toWrite;
    }
#endif

    /* ASSERT: rcPtr->method & FLAG(METH_WRITE) */
    /* ASSERT: rcPtr->mode & TCL_WRITABLE */

    Tcl_Preserve(rcPtr);
    Tcl_Preserve(rcPtr->interp);

    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;
	}

	Tcl_SetChannelError(rcPtr->chan, resObj);
        goto invalid;
    }

    if (Tcl_InterpDeleted(rcPtr->interp)) {
	/*
	 * The interp was destroyed during InvokeTclMethod().
	 */

	SetChannelErrorStr(rcPtr->chan, msg_send_dstlost);
        goto invalid;
    }
    if (Tcl_GetIntFromObj(rcPtr->interp, resObj, &written) != TCL_OK) {
	Tcl_SetChannelError(rcPtr->chan, MarshallError(rcPtr->interp));
        goto invalid;
    }

    if ((written == 0) && (toWrite > 0)) {
	/*
	 * The handler claims to have written nothing of what it was given.
	 * That is bad.
	 */

	SetChannelErrorStr(rcPtr->chan, msg_write_nothing);
        goto invalid;
    }
    if (toWrite < written) {
	/*
	 * The handler claims to have written more than it was given. That is
	 * bad. Note that the I/O core would crash if we were to return this
	 * information, trying to write -nnn bytes in the next iteration.
	 */

	SetChannelErrorStr(rcPtr->chan, msg_write_toomuch);
        goto invalid;
    }

    *errorCodePtr = EOK;
 stop:
    Tcl_DecrRefCount(bufObj);
    Tcl_DecrRefCount(resObj);		/* Remove reference held from invoke */
    Tcl_Release(rcPtr->interp);
    Tcl_Release(rcPtr);
    return written;
 invalid:
    *errorCodePtr = EINVAL;
 error:
    written = -1;
    goto stop;
}

/*
 *----------------------------------------------------------------------
 *
 * ReflectSeekWide / ReflectSeek --
 *
 *	This function is invoked when the user wishes to seek on the channel.
 *
 * Results:
 *	The new location of the access point.
 *
 * Side effects:
 *	Allocates memory. Arbitrary, as it calls upon a script.
 *
 *----------------------------------------------------------------------
 */

static Tcl_WideInt
ReflectSeekWide(
    ClientData clientData,
    Tcl_WideInt offset,
    int seekMode,
    int *errorCodePtr)
{
    ReflectedChannel *rcPtr = clientData;
    Tcl_Obj *offObj, *baseObj;
    Tcl_Obj *resObj;		/* Result for 'seek' */
    Tcl_WideInt newLoc;

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

#ifdef TCL_THREADS
    if (rcPtr->thread != Tcl_GetCurrentThread()) {
	ForwardParam p;

	p.seek.seekMode = seekMode;
	p.seek.offset = offset;

	ForwardOpToHandlerThread(rcPtr, ForwardedSeek, &p);

	if (p.base.code != TCL_OK) {
	    PassReceivedError(rcPtr->chan, &p);
	    *errorCodePtr = EINVAL;
	    p.seek.offset = -1;
	} else {
	    *errorCodePtr = EOK;
	}

	return p.seek.offset;
    }
#endif

    /* ASSERT: rcPtr->method & FLAG(METH_SEEK) */

    Tcl_Preserve(rcPtr);

    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;
    }

    if (newLoc < Tcl_LongAsWide(0)) {
	SetChannelErrorStr(rcPtr->chan, msg_seek_beforestart);
        goto invalid;
    }

    *errorCodePtr = EOK;
 stop:
    Tcl_DecrRefCount(offObj);
    Tcl_DecrRefCount(baseObj);
    Tcl_DecrRefCount(resObj);		/* Remove reference held from invoke */
    Tcl_Release(rcPtr);
    return newLoc;
 invalid:
    *errorCodePtr = EINVAL;
    newLoc = -1;
    goto stop;
}

static int
ReflectSeek(
    ClientData clientData,
    long offset,
    int seekMode,
    int *errorCodePtr)
{
    /*
     * This function can be invoked from a transformation which is based on
     * standard seeking, i.e. non-wide. Because of this we have to implement
     * it, a dummy is not enough. We simply delegate the call to the wide
     * routine.
     */

    return (int) ReflectSeekWide(clientData, Tcl_LongAsWide(offset), seekMode,
	    errorCodePtr);
}

/*
 *----------------------------------------------------------------------
 *
 * ReflectWatch --
 *
 *	This function is invoked to tell the channel what events the I/O
 *	system is interested in.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Allocates memory. Arbitrary, as it calls upon a script.
 *
 *----------------------------------------------------------------------
 */

static void
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;

    if (mask == rcPtr->interest) {
	/*
	 * Same old, same old, why should we do something?
	 */

	return;
    }

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

#ifdef TCL_THREADS
    if (rcPtr->thread != Tcl_GetCurrentThread()) {
	ForwardParam p;

	p.watch.mask = mask;
	ForwardOpToHandlerThread(rcPtr, ForwardedWatch, &p);

	/*
	 * Any failure from the forward is ignored. We have no place to put
	 * this.
	 */

	return;
    }
#endif

    Tcl_Preserve(rcPtr);

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

    Tcl_Release(rcPtr);
}

/*
 *----------------------------------------------------------------------
 *
 * ReflectBlock --
 *
 *	This function is invoked to tell the channel which blocking behaviour
 *	is required of it.
 *
 * Results:
 *	A posix error number.
 *
 * Side effects:
 *	Allocates memory. Arbitrary, as it calls upon a script.
 *
 *----------------------------------------------------------------------
 */

static int
ReflectBlock(
    ClientData clientData,
    int nonblocking)
{
    ReflectedChannel *rcPtr = clientData;
    Tcl_Obj *blockObj;
    int errorNum;		/* EINVAL or EOK (success). */
    Tcl_Obj *resObj;		/* Result data for 'blocking' */

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

#ifdef TCL_THREADS
    if (rcPtr->thread != Tcl_GetCurrentThread()) {
	ForwardParam p;

	p.block.nonblocking = nonblocking;

	ForwardOpToHandlerThread(rcPtr, ForwardedBlock, &p);

	if (p.base.code != TCL_OK) {
	    PassReceivedError(rcPtr->chan, &p);
	    return EINVAL;
	}

	return EOK;
    }
#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);
    Tcl_DecrRefCount(resObj);		/* Remove reference held from invoke */

    Tcl_Release(rcPtr);
    return errorNum;
}

#ifdef TCL_THREADS
/*
 *----------------------------------------------------------------------
 *
 * ReflectThread --
 *
 *	This function is invoked to tell the channel about thread movements.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Allocates memory. Arbitrary, as it calls upon a script.
 *
 *----------------------------------------------------------------------
 */

static void
ReflectThread(
    ClientData clientData,
    int action)
{
    ReflectedChannel *rcPtr = clientData;

    switch (action) {
    case TCL_CHANNEL_THREAD_INSERT:
        rcPtr->owner = Tcl_GetCurrentThread();
        break;
    case TCL_CHANNEL_THREAD_REMOVE:
        rcPtr->owner = NULL;
        break;
    default:
        Tcl_Panic("Unknown thread action code.");
        break;
    }
}

#endif
/*
 *----------------------------------------------------------------------
 *
 * ReflectSetOption --
 *
 *	This function is invoked to configure a channel option.
 *
 * Results:
 *	A standard Tcl result code.
 *
 * Side effects:
 *	Arbitrary, as it calls upon a Tcl script.
 *
 *----------------------------------------------------------------------
 */

static int
ReflectSetOption(
    ClientData clientData,	/* Channel to query */
    Tcl_Interp *interp,		/* Interpreter to leave error messages in */
    const char *optionName,	/* Name of requested option */
    const char *newValue)	/* The new value */
{
    ReflectedChannel *rcPtr = clientData;
    Tcl_Obj *optionObj, *valueObj;
    int result;			/* Result code for 'configure' */
    Tcl_Obj *resObj;		/* Result data for 'configure' */

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

#ifdef TCL_THREADS
    if (rcPtr->thread != Tcl_GetCurrentThread()) {
	ForwardParam p;

	p.setOpt.name = optionName;
	p.setOpt.value = newValue;

	ForwardOpToHandlerThread(rcPtr, ForwardedSetOpt, &p);

	if (p.base.code != TCL_OK) {
	    Tcl_Obj *err = Tcl_NewStringObj(p.base.msgStr, -1);

	    UnmarshallErrorResult(interp, err);
	    Tcl_DecrRefCount(err);
	    FreeReceivedError(&p);
	}

	return p.base.code;
    }
#endif
    Tcl_Preserve(rcPtr);

    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 */
    Tcl_Release(rcPtr);
    return result;
}

/*
 *----------------------------------------------------------------------
 *
 * ReflectGetOption --
 *
 *	This function is invoked to retrieve all or a channel option.
 *
 * Results:
 *	A standard Tcl result code.
 *
 * Side effects:
 *	Arbitrary, as it calls upon a Tcl script.
 *
 *----------------------------------------------------------------------
 */

static int
ReflectGetOption(
    ClientData clientData,	/* Channel to query */
    Tcl_Interp *interp,		/* Interpreter to leave error messages in */
    const char *optionName,	/* Name of reuqested option */
    Tcl_DString *dsPtr)		/* String to place the result into */
{
    /*
     * This code is special. It has regular passing of Tcl result, and errors.
     * The bypass functions are not required.
     */

    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()) {
	int opcode;
	ForwardParam p;

	p.getOpt.name = optionName;
	p.getOpt.value = dsPtr;

	if (optionName == NULL) {
	    opcode = ForwardedGetOptAll;
	} else {
	    opcode = ForwardedGetOpt;
	}

	ForwardOpToHandlerThread(rcPtr, opcode, &p);

	if (p.base.code != TCL_OK) {
	    Tcl_Obj *err = Tcl_NewStringObj(p.base.msgStr, -1);

	    UnmarshallErrorResult(interp, err);
	    Tcl_DecrRefCount(err);


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