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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.
*
* RCS: @(#) $Id: tclIORChan.c,v 1.1.2.2 2005/08/25 15:46:31 dgp Exp $
*/
#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.
*/
/* Required */
static int RcClose _ANSI_ARGS_((ClientData clientData,
Tcl_Interp *interp));
/* Required, "read" is optional despite this. */
static int RcInput _ANSI_ARGS_((ClientData clientData,
char *buf, int toRead, int *errorCodePtr));
/* Required, "write" is optional despite this. */
static int RcOutput _ANSI_ARGS_((ClientData clientData,
CONST char *buf, int toWrite, int *errorCodePtr));
/* Required */
static void RcWatch _ANSI_ARGS_((ClientData clientData, int mask));
/* NULL'able - "blocking", is optional */
static int RcBlock _ANSI_ARGS_((ClientData clientData,
int mode));
/* NULL'able - "seek", is optional */
static Tcl_WideInt RcSeekWide _ANSI_ARGS_((ClientData clientData,
Tcl_WideInt offset,
int mode, int *errorCodePtr));
static int RcSeek _ANSI_ARGS_((ClientData clientData,
long offset, int mode, int *errorCodePtr));
/* NULL'able - "cget" / "cgetall", are optional */
static int RcGetOption _ANSI_ARGS_((ClientData clientData,
Tcl_Interp* interp,
CONST char *optionName,
Tcl_DString *dsPtr));
/* NULL'able - "configure", is optional */
static int RcSetOption _ANSI_ARGS_((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 Tcl_ChannelType tclRChannelType = {
"tclrchannel", /* Type name. */
TCL_CHANNEL_VERSION_3,
RcClose, /* Close channel, clean instance data */
RcInput, /* Handle read request */
RcOutput, /* Handle write request */
RcSeek, /* Move location of access point. NULL'able */
RcSetOption, /* Set options. NULL'able */
RcGetOption, /* Get options. NULL'able */
RcWatch, /* Initialize notifier */
NULL, /* Get OS handle from the channel. NULL'able */
NULL, /* No close2 support. NULL'able */
RcBlock, /* Set blocking/nonblocking. NULL'able */
NULL, /* Flush channel. Not used by core. NULL'able */
NULL, /* Handle events. NULL'able */
RcSeekWide /* Move access point (64 bit). NULL'able */
};
/*
* 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. */
#ifdef TCL_THREADS
Tcl_ThreadId thread; /* Thread the 'interp' belongs to. */
#endif
/* See [==] as well.
* Storage for the command prefix and the additional words required
* for the invocation of methods in the command handler.
*
* argv [0] ... [.] | [argc-2] [argc-1] | [argc] [argc+2]
* cmd ... pfx | method chan | detail1 detail2
* ~~~~ CT ~~~ ~~ CT ~~
*
* CT = Belongs to the 'Command handler Thread'.
*/
int argc; /* Number of preallocated words - 2 */
Tcl_Obj** argv; /* Preallocated array for calling the handler.
* args [0] is placeholder for cmd word.
* Followed by the arguments in the prefix,
* plus 4 placeholders for method, channel,
* and at most two varying (method specific)
* words.
*/
int methods; /* Bitmask of supported methods */
/* ---------------------------------------- */
/* NOTE (9): Should we have predefined shared literals
* NOTE (9): for the method names ?
*/
/* ---------------------------------------- */
int mode; /* Mask of R/W mode */
int interest; /* Mask of events the channel is interested in. */
/* 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.
*/
} ReflectingChannel;
/*
* Event literals. ==================================================
*/
static CONST char *eventOptions[] = {
"read", "write", (char *) NULL
};
typedef enum {
EVENT_READ, EVENT_WRITE
} EventOption;
/*
* Method literals. ==================================================
*/
static CONST char *methodNames[] = {
"blocking", /* OPT */
"cget", /* OPT \/ Together or none */
"cgetall", /* OPT /\ of these two */
"configure", /* OPT */
"finalize", /* */
"initialize", /* */
"read", /* OPT */
"seek", /* OPT */
"watch", /* */
"write", /* OPT */
(char *) 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 {
RcOpClose,
RcOpInput,
RcOpOutput,
RcOpSeek,
RcOpWatch,
RcOpBlock,
RcOpSetOpt,
RcOpGetOpt,
RcOpGetOptAll
} RcOperation;
/*
* 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 RcForwardParamBase {
int code; /* O: Ok/Fail of the cmd handler */
char* msg; /* O: Error message for handler failure */
int vol; /* O: True - msg is allocated, False - msg is static */
} RcForwardParamBase;
/*
* Operation specific parameter/result structures.
*/
typedef struct RcForwardParamClose {
RcForwardParamBase b;
} RcForwardParamClose;
typedef struct RcForwardParamInput {
RcForwardParamBase b;
char* buf; /* O: Where to store the read bytes */
int toRead; /* I: #bytes to read,
* O: #bytes actually read */
} RcForwardParamInput;
typedef struct RcForwardParamOutput {
RcForwardParamBase b;
CONST char* buf; /* I: Where the bytes to write come from */
int toWrite; /* I: #bytes to write,
* O: #bytes actually written */
} RcForwardParamOutput;
typedef struct RcForwardParamSeek {
RcForwardParamBase b;
int seekMode; /* I: How to seek */
Tcl_WideInt offset; /* I: Where to seek,
* O: New location */
} RcForwardParamSeek;
typedef struct RcForwardParamWatch {
RcForwardParamBase b;
int mask; /* I: What events to watch for */
} RcForwardParamWatch;
typedef struct RcForwardParamBlock {
RcForwardParamBase b;
int nonblocking; /* I: What mode to activate */
} RcForwardParamBlock;
typedef struct RcForwardParamSetOpt {
RcForwardParamBase b;
CONST char* name; /* Name of option to set */
CONST char* value; /* Value to set */
} RcForwardParamSetOpt;
typedef struct RcForwardParamGetOpt {
RcForwardParamBase b;
CONST char* name; /* Name of option to get, maybe NULL */
Tcl_DString* value; /* Result */
} RcForwardParamGetOpt;
/*
* General event structure, with reference to
* operation specific data.
*/
typedef struct RcForwardingEvent {
Tcl_Event event; /* Basic event data, has to be first item */
struct RcForwardingResult* resultPtr;
RcOperation op; /* Forwarded driver operation */
ReflectingChannel* rcPtr; /* Channel instance */
CONST RcForwardParamBase* param; /* Arguments, a RcForwardParamXXX pointer */
} RcForwardingEvent;
/*
* 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.
*/
typedef struct RcForwardingResult {
Tcl_ThreadId src; /* Originating thread. */
Tcl_ThreadId dst; /* Thread the op was forwarded to. */
Tcl_Condition done; /* Condition variable the forwarder blocks on. */
int result; /* TCL_OK or TCL_ERROR */
struct RcForwardingEvent* evPtr; /* Event the result belongs to. */
struct RcForwardingResult* prevPtr; /* Links into the list of pending */
struct RcForwardingResult* nextPtr; /* forwarded results. */
} RcForwardingResult;
/*
* List of forwarded operations which have not completed yet, plus the
* mutex to protect the access to this process global list.
*/
static RcForwardingResult* forwardList = (RcForwardingResult*) NULL;
TCL_DECLARE_MUTEX (rcForwardMutex)
/*
* Function containing the generic code executing a forward, and
* wrapper macros for the actual operations we wish to forward.
*/
static void
RcForwardOp _ANSI_ARGS_ ((ReflectingChannel* rcPtr, RcOperation op,
Tcl_ThreadId dst, CONST VOID* param));
/*
* The event function executed by the thread receiving a forwarding
* event. Executes the appropriate function and collects the result,
* if any.
*/
static int
RcForwardProc _ANSI_ARGS_ ((Tcl_Event *evPtr, int mask));
/*
* Helpers which intercept when threads are going away, and clean up
* after pending forwarding events. Different actions depending on
* which thread went away, originator (src), or receiver (dst).
*/
static void
RcSrcExitProc _ANSI_ARGS_ ((ClientData clientData));
static void
RcDstExitProc _ANSI_ARGS_ ((ClientData clientData));
#define RcFreeReceivedError(pb) \
if ((pb).vol) {ckfree ((pb).msg);}
#define RcPassReceivedErrorInterp(i,pb) \
if ((i)) {Tcl_SetChannelErrorInterp ((i), Tcl_NewStringObj ((pb).msg,-1));} \
RcFreeReceivedError (pb)
#define RcPassReceivedError(c,pb) \
Tcl_SetChannelError ((c), Tcl_NewStringObj ((pb).msg,-1)); \
RcFreeReceivedError (pb)
#define RcForwardSetStaticError(p,emsg) \
(p)->code = TCL_ERROR; (p)->vol = 0; (p)->msg = (char*) (emsg);
#define RcForwardSetDynError(p,emsg) \
(p)->code = TCL_ERROR; (p)->vol = 1; (p)->msg = (char*) (emsg);
static void
RcForwardSetObjError _ANSI_ARGS_ ((RcForwardParamBase* p,
Tcl_Obj* obj));
#endif /* TCL_THREADS */
#define RcSetChannelErrorStr(c,msg) \
Tcl_SetChannelError ((c), Tcl_NewStringObj ((msg),-1))
static Tcl_Obj* RcErrorMarshall _ANSI_ARGS_ ((Tcl_Interp *interp));
static void RcErrorReturn _ANSI_ARGS_ ((Tcl_Interp* interp, Tcl_Obj* msg));
/*
* Static functions for this file:
*/
static int RcEncodeEventMask _ANSI_ARGS_((Tcl_Interp* interp,
CONST char* objName, Tcl_Obj* obj,
int* mask));
static Tcl_Obj* RcDecodeEventMask _ANSI_ARGS_ ((int mask));
static ReflectingChannel* RcNew _ANSI_ARGS_ ((Tcl_Interp* interp,
Tcl_Obj* cmdpfxObj, int mode,
Tcl_Obj* id));
static Tcl_Obj* RcNewHandle _ANSI_ARGS_ ((void));
static void RcFree _ANSI_ARGS_ ((ReflectingChannel* rcPtr));
static void
RcInvokeTclMethod _ANSI_ARGS_((ReflectingChannel* rcPtr,
CONST char* method, Tcl_Obj* argone, Tcl_Obj* argtwo,
int* result, Tcl_Obj** resultObj, int capture));
#define NO_CAPTURE (0)
#define DO_CAPTURE (1)
/*
* 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_seek_beforestart = "{Tried to seek before origin}";
#ifdef TCL_THREADS
static CONST char* msg_send_originlost = "{Origin thread lost}";
static CONST char* msg_send_dstlost = "{Destination thread lost}";
#endif /* TCL_THREADS */
/*
* Main methods to plug into the 'chan' ensemble'. ==================
*/
/*
*----------------------------------------------------------------------
*
* TclChanCreateObjCmd --
*
* This procedure 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 (/*ignored*/ clientData, interp, objc, objv)
ClientData clientData;
Tcl_Interp* interp;
int objc;
Tcl_Obj* CONST* objv;
{
ReflectingChannel* 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 res; /* Result code for 'initialize' */
Tcl_Obj* resObj; /* Result data for 'initialize' */
int methods; /* Bitmask for supported methods. */
Channel* chanPtr; /* 'chan' resolved to internal struct. */
/* 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 (RcEncodeEventMask (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 '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 = RcNewHandle ();
rcPtr = RcNew (interp, cmdObj, mode, rcId);
chan = Tcl_CreateChannel (&tclRChannelType,
Tcl_GetString (rcId),
rcPtr, mode);
rcPtr->chan = 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 = RcDecodeEventMask (mode);
RcInvokeTclMethod (rcPtr, "initialize", modeObj, NULL,
&res, &resObj, NO_CAPTURE);
Tcl_DecrRefCount (modeObj);
if (res != TCL_OK) {
Tcl_Obj* err = Tcl_NewStringObj ("Initialize failure: ",-1);
Tcl_AppendObjToObj(err,resObj);
Tcl_SetObjResult (interp,err);
Tcl_DecrRefCount (resObj); /* Remove reference we held from the 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.
*/
Tcl_AppendResult (interp, "Initialize failure: ", (char*) NULL);
if (Tcl_ListObjGetElements (interp, resObj,
&listc, &listv) != TCL_OK) {
/* The function above replaces my prefix in case of an error,
* so more work for us to get the prefix back into the error
* message
*/
Tcl_Obj* err = Tcl_NewStringObj ("Initialize failure: ",-1);
Tcl_AppendObjToObj(err,Tcl_GetObjResult (interp));
Tcl_SetObjResult (interp,err);
goto error;
}
methods = 0;
while (listc > 0) {
if (Tcl_GetIndexFromObj (interp, listv [listc-1],
methodNames, "method", TCL_EXACT, &methIndex) != TCL_OK) {
Tcl_Obj* err = Tcl_NewStringObj ("Initialize failure: ",-1);
Tcl_AppendObjToObj(err,Tcl_GetObjResult (interp));
Tcl_SetObjResult (interp,err);
goto error;
}
methods |= FLAG (methIndex);
listc --;
}
if ((REQUIRED_METHODS & methods) != REQUIRED_METHODS) {
Tcl_AppendResult (interp, "Not all required methods supported",
(char*) NULL);
goto error;
}
if ((mode & TCL_READABLE) && !HAS(methods,METH_READ)) {
Tcl_AppendResult (interp, "Reading not supported, but requested",
(char*) NULL);
goto error;
}
if ((mode & TCL_WRITABLE) && !HAS(methods,METH_WRITE)) {
Tcl_AppendResult (interp, "Writing not supported, but requested",
(char*) NULL);
goto error;
}
if (!IMPLIES (HAS(methods,METH_CGET), HAS(methods,METH_CGETALL))) {
Tcl_AppendResult (interp, "'cgetall' not supported, but should be, as 'cget' is",
(char*) NULL);
goto error;
}
if (!IMPLIES (HAS(methods,METH_CGETALL),HAS(methods,METH_CGET))) {
Tcl_AppendResult (interp, "'cget' not supported, but should be, as 'cgetall' is",
(char*) NULL);
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_ChannelType* clonePtr = (Tcl_ChannelType*) ckalloc (sizeof (Tcl_ChannelType));
if (clonePtr == (Tcl_ChannelType*) NULL) {
Tcl_Panic ("Out of memory in Tcl_RcCreate");
}
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;
}
Tcl_RegisterChannel (interp, chan);
/* Return handle as result of command */
Tcl_SetObjResult (interp, rcId);
return TCL_OK;
error:
/* Signal to RcClose to not call 'finalize' */
rcPtr->methods = 0;
Tcl_Close (interp, chan);
return TCL_ERROR;
#undef MODE
#undef CMD
}
/*
*----------------------------------------------------------------------
*
* TclChanPostEventObjCmd --
*
* This procedure 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.
*
*----------------------------------------------------------------------
*/
int
TclChanPostEventObjCmd (/*ignored*/ clientData, interp, objc, objv)
ClientData clientData;
Tcl_Interp* interp;
int objc;
Tcl_Obj* CONST* objv;
{
/* 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 */
Tcl_ChannelType* chanTypePtr; /* Its associated driver structure */
ReflectingChannel* rcPtr; /* Associated instance data */
int mode; /* Dummy, r|w mode of the channel */
int events; /* Mask of events to post */
/* 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 = Tcl_GetString (objv [CHAN]);
chan = Tcl_GetChannel(interp, chanId, &mode);
if (chan == (Tcl_Channel) NULL) {
return TCL_ERROR;
}
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 != &RcWatch) {
Tcl_AppendResult(interp, "channel \"", chanId,
"\" is not a reflected channel",
(char *) NULL);
return TCL_ERROR;
}
rcPtr = (ReflectingChannel*) Tcl_GetChannelInstanceData (chan);
if (rcPtr->interp != interp) {
Tcl_AppendResult(interp, "postevent for channel \"", chanId,
"\" called from outside interpreter",
(char *) NULL);
return TCL_ERROR;
}
/* Second argument is a list of events. Allowed entries are
* "read", "write". Expect at least one list element.
* Abbreviations are ok.
*/
if (RcEncodeEventMask (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_AppendResult(interp, "tried to post events channel \"", chanId,
"\" is not interested in",
(char *) NULL);
return TCL_ERROR;
}
/* We have the channel and the events to post.
*/
Tcl_NotifyChannel (chan, events);
/* Squash interp results left by the event script.
*/
Tcl_ResetResult (interp);
return TCL_OK;
#undef CHAN
#undef EVENT
}
static Tcl_Obj*
RcErrorMarshall (interp)
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
RcErrorReturn (interp, msg)
Tcl_Interp *interp;
Tcl_Obj *msg;
{
int res;
int lc;
Tcl_Obj** lv;
int explicitResult;
int numOptions;
/* Process the caught message.
*
* Syntax = (option value)... ?message?
*
* Bad syntax causes a panic. Because the other side uses
* Tcl_GetReturnOptions and list construction functions to marshall the
* information.
*/
res = Tcl_ListObjGetElements (interp, msg, &lc, &lv);
if (res != TCL_OK) {
Tcl_Panic ("TclChanCaughtErrorBypass: Bad syntax of caught result");
}
explicitResult = (1 == (lc % 2));
numOptions = lc - explicitResult;
if (explicitResult) {
Tcl_SetObjResult (interp, lv [lc-1]);
}
(void) Tcl_SetReturnOptions(interp, Tcl_NewListObj (numOptions, lv));
}
int
TclChanCaughtErrorBypass (interp, chan)
Tcl_Interp *interp;
Tcl_Channel chan;
{
Tcl_Obj* msgc = NULL;
Tcl_Obj* msgi = NULL;
Tcl_Obj* msg = 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, &msgc);
}
if (interp != NULL) {
Tcl_GetChannelErrorInterp (interp, &msgi);
}
if (msgc != NULL) {
msg = msgc;
Tcl_IncrRefCount (msg);
} else if (msgi != NULL) {
msg = msgi;
Tcl_IncrRefCount (msg);
}
if (msgc != NULL) {
Tcl_DecrRefCount (msgc);
}
if (msgi != NULL) {
Tcl_DecrRefCount (msgi);
}
/* No message returned, nothing caught.
*/
if (msg == NULL) {
return 0;
}
RcErrorReturn (interp, msg);
Tcl_DecrRefCount (msg);
return 1;
}
/*
* Driver functions. ================================================
*/
/*
*----------------------------------------------------------------------
*
* RcClose --
*
* 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
RcClose (clientData, interp)
ClientData clientData;
Tcl_Interp* interp;
{
ReflectingChannel* rcPtr = (ReflectingChannel*) clientData;
int res; /* Result code for 'close' */
Tcl_Obj* resObj; /* Result data for 'close' */
if (interp == (Tcl_Interp*) NULL) {
/* 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: Have a thread delete handler for the origin
* thread. Use this to clean up the structure!
*/
#ifdef TCL_THREADS
/* Are we in the correct thread ?
*/
if (rcPtr->thread != Tcl_GetCurrentThread ()) {
RcForwardParamClose p;
RcForwardOp (rcPtr, RcOpClose, rcPtr->thread, &p);
res = p.b.code;
/* RcFree is done in the forwarded operation!,
* in the other thread. rcPtr here is gone!
*/
if (res != TCL_OK) {
RcFreeReceivedError (p.b);
}
} else {
#endif
RcFree (rcPtr);
#ifdef TCL_THREADS
}
#endif
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) {
RcFree (rcPtr);
return EOK;
} else {
#ifdef TCL_THREADS
/* Are we in the correct thread ?
*/
if (rcPtr->thread != Tcl_GetCurrentThread ()) {
RcForwardParamClose p;
RcForwardOp (rcPtr, RcOpClose, rcPtr->thread, &p);
res = p.b.code;
/* RcFree is done in the forwarded operation!,
* in the other thread. rcPtr here is gone!
*/
if (res != TCL_OK) {
RcPassReceivedErrorInterp (interp, p.b);
}
} else {
#endif
RcInvokeTclMethod (rcPtr, "finalize", NULL, NULL,
&res, &resObj, DO_CAPTURE);
if ((res != TCL_OK) && (interp != NULL)) {
Tcl_SetChannelErrorInterp (interp, resObj);
}
Tcl_DecrRefCount (resObj); /* Remove reference we held from the invoke */
#ifdef TCL_THREADS
RcFree (rcPtr);
}
#endif
return (res == TCL_OK) ? EOK : EINVAL;
}
Tcl_Panic ("Should not be reached");
return EINVAL;
}
/*
*----------------------------------------------------------------------
*
* RcInput --
*
* 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
RcInput (clientData, buf, toRead, errorCodePtr)
ClientData clientData;
char* buf;
int toRead;
int* errorCodePtr;
{
ReflectingChannel* rcPtr = (ReflectingChannel*) clientData;
Tcl_Obj* toReadObj;
int bytec; /* Number of returned bytes */
unsigned char* bytev; /* Array of returned bytes */
int res; /* Result code for 'read' */
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))) {
RcSetChannelErrorStr (rcPtr->chan, msg_read_unsup);
*errorCodePtr = EINVAL;
return -1;
}
#ifdef TCL_THREADS
/* Are we in the correct thread ?
*/
if (rcPtr->thread != Tcl_GetCurrentThread ()) {
RcForwardParamInput p;
p.buf = buf;
p.toRead = toRead;
RcForwardOp (rcPtr, RcOpInput, rcPtr->thread, &p);
if (p.b.code != TCL_OK) {
RcPassReceivedError (rcPtr->chan, p.b);
*errorCodePtr = EINVAL;
} else {
*errorCodePtr = EOK;
}
return p.toRead;
}
#endif
/* -------- */
/* ASSERT: rcPtr->method & FLAG (METH_READ) */
/* ASSERT: rcPtr->mode & TCL_READABLE */
toReadObj = Tcl_NewIntObj(toRead);
if (toReadObj == (Tcl_Obj*) NULL) {
Tcl_Panic ("Out of memory in RcInput");
}
RcInvokeTclMethod (rcPtr, "read", toReadObj, NULL,
&res, &resObj, DO_CAPTURE);
if (res != TCL_OK) {
Tcl_SetChannelError (rcPtr->chan, resObj);
Tcl_DecrRefCount (resObj); /* Remove reference we held from the invoke */
*errorCodePtr = EINVAL;
return -1;
}
bytev = Tcl_GetByteArrayFromObj(resObj, &bytec);
if (toRead < bytec) {
Tcl_DecrRefCount (resObj); /* Remove reference we held from the invoke */
RcSetChannelErrorStr (rcPtr->chan, msg_read_toomuch);
*errorCodePtr = EINVAL;
return -1;
}
*errorCodePtr = EOK;
if (bytec > 0) {
memcpy (buf, bytev, bytec);
}
Tcl_DecrRefCount (resObj); /* Remove reference we held from the invoke */
return bytec;
}
/*
*----------------------------------------------------------------------
*
* RcOutput --
*
* 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
RcOutput (clientData, buf, toWrite, errorCodePtr)
ClientData clientData;
CONST char* buf;
int toWrite;
int* errorCodePtr;
{
ReflectingChannel* rcPtr = (ReflectingChannel*) clientData;
Tcl_Obj* bufObj;
int res; /* Result code for 'write' */
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))) {
RcSetChannelErrorStr (rcPtr->chan, msg_write_unsup);
*errorCodePtr = EINVAL;
return -1;
}
#ifdef TCL_THREADS
/* Are we in the correct thread ?
*/
if (rcPtr->thread != Tcl_GetCurrentThread ()) {
RcForwardParamOutput p;
p.buf = buf;
p.toWrite = toWrite;
RcForwardOp (rcPtr, RcOpOutput, rcPtr->thread, &p);
if (p.b.code != TCL_OK) {
RcPassReceivedError (rcPtr->chan, p.b);
*errorCodePtr = EINVAL;
} else {
*errorCodePtr = EOK;
}
return p.toWrite;
}
#endif
/* -------- */
/* ASSERT: rcPtr->method & FLAG (METH_WRITE) */
/* ASSERT: rcPtr->mode & TCL_WRITABLE */
bufObj = Tcl_NewByteArrayObj((unsigned char*) buf, toWrite);
if (bufObj == (Tcl_Obj*) NULL) {
Tcl_Panic ("Out of memory in RcOutput");
}
RcInvokeTclMethod (rcPtr, "write", bufObj, NULL,
&res, &resObj, DO_CAPTURE);
if (res != TCL_OK) {
Tcl_SetChannelError (rcPtr->chan, resObj);
Tcl_DecrRefCount (resObj); /* Remove reference we held from the invoke */
*errorCodePtr = EINVAL;
return -1;
}
res = Tcl_GetIntFromObj (rcPtr->interp, resObj, &written);
if (res != TCL_OK) {
Tcl_DecrRefCount (resObj); /* Remove reference we held from the invoke */
Tcl_SetChannelError (rcPtr->chan, RcErrorMarshall (rcPtr->interp));
*errorCodePtr = EINVAL;
return -1;
}
Tcl_DecrRefCount (resObj); /* Remove reference we held from the invoke */
if ((written == 0) || (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.
*/
RcSetChannelErrorStr (rcPtr->chan, msg_write_toomuch);
*errorCodePtr = EINVAL;
return -1;
}
*errorCodePtr = EOK;
return written;
}
/*
*----------------------------------------------------------------------
*
* RcSeekWide / RcSeek --
*
* 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
RcSeekWide (clientData, offset, seekMode, errorCodePtr)
ClientData clientData;
Tcl_WideInt offset;
int seekMode;
int* errorCodePtr;
{
ReflectingChannel* rcPtr = (ReflectingChannel*) clientData;
Tcl_Obj* offObj;
Tcl_Obj* baseObj;
int res; /* Result code for 'seek' */
Tcl_Obj* resObj; /* Result data for 'seek' */
Tcl_WideInt newLoc;
#ifdef TCL_THREADS
/* Are we in the correct thread ?
*/
if (rcPtr->thread != Tcl_GetCurrentThread ()) {
RcForwardParamSeek p;
p.seekMode = seekMode;
p.offset = offset;
RcForwardOp (rcPtr, RcOpSeek, rcPtr->thread, &p);
if (p.b.code != TCL_OK) {
RcPassReceivedError (rcPtr->chan, p.b);
*errorCodePtr = EINVAL;
} else {
*errorCodePtr = EOK;
}
return p.offset;
}
#endif
/* -------- */
/* ASSERT: rcPtr->method & FLAG (METH_SEEK) */
offObj = Tcl_NewWideIntObj(offset);
if (offObj == (Tcl_Obj*) NULL) {
Tcl_Panic ("Out of memory in RcSeekWide");
}
baseObj = Tcl_NewStringObj((seekMode == SEEK_SET) ?
"start" :
((seekMode == SEEK_CUR) ?
"current" :
"end"), -1);
if (baseObj == (Tcl_Obj*) NULL) {
Tcl_Panic ("Out of memory in RcSeekWide");
}
RcInvokeTclMethod (rcPtr, "seek", offObj, baseObj,
&res, &resObj, DO_CAPTURE);
if (res != TCL_OK) {
Tcl_SetChannelError (rcPtr->chan, resObj);
Tcl_DecrRefCount (resObj); /* Remove reference we held from the invoke */
*errorCodePtr = EINVAL;
return -1;
}
res = Tcl_GetWideIntFromObj (rcPtr->interp, resObj, &newLoc);
if (res != TCL_OK) {
Tcl_DecrRefCount (resObj); /* Remove reference we held from the invoke */
Tcl_SetChannelError (rcPtr->chan, RcErrorMarshall (rcPtr->interp));
*errorCodePtr = EINVAL;
return -1;
}
Tcl_DecrRefCount (resObj); /* Remove reference we held from the invoke */
if (newLoc < Tcl_LongAsWide (0)) {
RcSetChannelErrorStr (rcPtr->chan, msg_seek_beforestart);
*errorCodePtr = EINVAL;
return -1;
}
*errorCodePtr = EOK;
return newLoc;
}
static int
RcSeek (clientData, offset, seekMode, errorCodePtr)
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 o this we have to
* implement it, a dummy is not enough. We simply delegate the call
* to the wide routine.
*/
return (int) RcSeekWide (clientData, Tcl_LongAsWide (offset),
seekMode, errorCodePtr);
}
/*
*----------------------------------------------------------------------
*
* RcWatch --
*
* 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
RcWatch (clientData, mask)
ClientData clientData;
int mask;
{
ReflectingChannel* rcPtr = (ReflectingChannel*) 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. Analoguous for read events.
*/
mask = mask & rcPtr->mode;
if (mask == rcPtr->interest) {
/* Same old, same old, why should we do something ? */
return;
}
rcPtr->interest = mask;
#ifdef TCL_THREADS
/* Are we in the correct thread ?
*/
if (rcPtr->thread != Tcl_GetCurrentThread ()) {
RcForwardParamWatch p;
p.mask = mask;
RcForwardOp (rcPtr, RcOpWatch, rcPtr->thread, &p);
/* Any failure from the forward is ignored. We have no place to
* put this.
*/
return;
}
#endif
/* -------- */
maskObj = RcDecodeEventMask (mask);
RcInvokeTclMethod (rcPtr, "watch", maskObj, NULL,
NULL, NULL, NO_CAPTURE);
Tcl_DecrRefCount (maskObj);
}
/*
*----------------------------------------------------------------------
*
* RcBlock --
*
* 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
RcBlock (clientData, nonblocking)
ClientData clientData;
int nonblocking;
{
ReflectingChannel* rcPtr = (ReflectingChannel*) clientData;
Tcl_Obj* blockObj;
int res; /* Result code for 'blocking' */
Tcl_Obj* resObj; /* Result data for 'blocking' */
#ifdef TCL_THREADS
/* Are we in the correct thread ?
*/
if (rcPtr->thread != Tcl_GetCurrentThread ()) {
RcForwardParamBlock p;
p.nonblocking = nonblocking;
RcForwardOp (rcPtr, RcOpBlock, rcPtr->thread, &p);
if (p.b.code != TCL_OK) {
RcPassReceivedError (rcPtr->chan, p.b);
return EINVAL;
} else {
return EOK;
}
}
#endif
/* -------- */
blockObj = Tcl_NewBooleanObj(!nonblocking);
if (blockObj == (Tcl_Obj*) NULL) {
Tcl_Panic ("Out of memory in RcBlock");
}
RcInvokeTclMethod (rcPtr, "blocking", blockObj, NULL,
&res, &resObj, DO_CAPTURE);
if (res != TCL_OK) {
Tcl_SetChannelError (rcPtr->chan, resObj);
res = EINVAL;
} else {
res = EOK;
}
Tcl_DecrRefCount (resObj); /* Remove reference we held from the invoke */
return res;
}
/*
*----------------------------------------------------------------------
*
* RcSetOption --
*
* 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
RcSetOption (clientData, interp, optionName, newValue)
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 */
{
ReflectingChannel* rcPtr = (ReflectingChannel*) clientData;
Tcl_Obj* optionObj;
Tcl_Obj* valueObj;
int res; /* Result code for 'configure' */
Tcl_Obj* resObj; /* Result data for 'configure' */
#ifdef TCL_THREADS
/* Are we in the correct thread ?
*/
if (rcPtr->thread != Tcl_GetCurrentThread ()) {
RcForwardParamSetOpt p;
p.name = optionName;
p.value = newValue;
RcForwardOp (rcPtr, RcOpSetOpt, rcPtr->thread, &p);
if (p.b.code != TCL_OK) {
Tcl_Obj* err = Tcl_NewStringObj (p.b.msg, -1);
RcErrorReturn (interp, err);
Tcl_DecrRefCount (err);
if (p.b.vol) {ckfree (p.b.msg);}
}
return p.b.code;
}
#endif
/* -------- */
optionObj = Tcl_NewStringObj(optionName,-1);
if (optionObj == (Tcl_Obj*) NULL) {
Tcl_Panic ("Out of memory in RcSetOption");
}
valueObj = Tcl_NewStringObj(newValue,-1);
if (valueObj == (Tcl_Obj*) NULL) {
Tcl_Panic ("Out of memory in RcSetOption");
}
RcInvokeTclMethod (rcPtr, "configure", optionObj, valueObj,
&res, &resObj, DO_CAPTURE);
if (res != TCL_OK) {
RcErrorReturn (interp, resObj);
}
Tcl_DecrRefCount (resObj); /* Remove reference we held from the invoke */
return res;
}
/*
*----------------------------------------------------------------------
*
* RcGetOption --
*
* 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
RcGetOption (clientData, interp, optionName, dsPtr)
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.
*/
ReflectingChannel* rcPtr = (ReflectingChannel*) clientData;
Tcl_Obj* optionObj;
int res; /* Result code for 'configure' */
Tcl_Obj* resObj; /* Result data for 'configure' */
int listc;
Tcl_Obj** listv;
const char* method;
#ifdef TCL_THREADS
/* Are we in the correct thread ?
*/
if (rcPtr->thread != Tcl_GetCurrentThread ()) {
int opcode;
RcForwardParamGetOpt p;
p.name = optionName;
p.value = dsPtr;
if (optionName == (char*) NULL) {
opcode = RcOpGetOptAll;
} else {
opcode = RcOpGetOpt;
}
RcForwardOp (rcPtr, opcode, rcPtr->thread, &p);
if (p.b.code != TCL_OK) {
Tcl_Obj* err = Tcl_NewStringObj (p.b.msg, -1);
RcErrorReturn (interp, err);
Tcl_DecrRefCount (err);
if (p.b.vol) {ckfree (p.b.msg);}
}
return p.b.code;
}
#endif
/* -------- */
if (optionName == (char*) NULL) {
/* Retrieve all options. */
method = "cgetall";
optionObj = NULL;
} else {
/* Retrieve the value of one option */
method = "cget";
optionObj = Tcl_NewStringObj(optionName,-1);
if (optionObj == (Tcl_Obj*) NULL) {
Tcl_Panic ("Out of memory in RcGetOption");
}
}
RcInvokeTclMethod (rcPtr, method, optionObj, NULL,
&res, &resObj, DO_CAPTURE);
if (res != TCL_OK) {
RcErrorReturn (interp, resObj);
Tcl_DecrRefCount (resObj); /* Remove reference we held from the invoke */
return res;
}
/* The result has to go into the 'dsPtr' for propagation to the
* caller of the driver.
*/
if (optionObj != NULL) {
Tcl_DStringAppend (dsPtr, Tcl_GetString (resObj), -1);
Tcl_DecrRefCount (resObj); /* Remove reference we held from the invoke */
return res;
}
/* Extract the list and append each item as element.
*/
/* NOTE (4): If we extract the string rep we can assume a
* NOTE (4): properly quoted string. Together with a separating
* NOTE (4): space this way of simply appending the whole string
* NOTE (4): rep might be faster. It also doesn't check if the
* NOTE (4): result is a valid list. Nor that the list has an
* NOTE (4): even number elements.
* NOTE (4): ---
*/
res = Tcl_ListObjGetElements (interp, resObj, &listc, &listv);
if (res != TCL_OK) {
Tcl_DecrRefCount (resObj); /* Remove reference we held from the invoke */
return res;
}
if ((listc % 2) == 1) {
/* Odd number of elements is wrong.
*/
char buf [20];
sprintf (buf, "%d", listc);
Tcl_ResetResult (interp);
Tcl_AppendResult (interp,
"Expected list with even number of elements, got ",
buf, (listc == 1 ? " element" : " elements"),
" instead", (char*) NULL);
Tcl_DecrRefCount (resObj); /* Remove reference we held from the invoke */
return TCL_ERROR;
}
{
int len;
char* str = Tcl_GetStringFromObj (resObj, &len);
if (len) {
Tcl_DStringAppend (dsPtr, " ", 1);
Tcl_DStringAppend (dsPtr, str, len);
}
}
Tcl_DecrRefCount (resObj); /* Remove reference we held from the invoke */
return res;
}
/*
* Helpers. =========================================================
*/
/*
*----------------------------------------------------------------------
*
* RcEncodeEventMask --
*
* This function takes a list of event items and constructs the
* equivalent internal bitmask. The list has to contain at
* least one element. Elements are "read", "write", or any unique
* abbreviation thereof. Note that the bitmask is not changed if
* problems are encountered.
*
* Results:
* A standard Tcl error code. A bitmask where TCL_READABLE
* and/or TCL_WRITABLE can be set.
*
* Side effects:
* May shimmer 'obj' to a list representation. May place an
* error message into the interp result.
*
*----------------------------------------------------------------------
*/
static int
RcEncodeEventMask (interp, objName, obj, mask)
Tcl_Interp* interp;
CONST char* objName;
Tcl_Obj* obj;
int* mask;
{
int events; /* Mask of events to post */
int listc; /* #elements in eventspec list */
Tcl_Obj** listv; /* Elements of eventspec list */
int evIndex; /* Id of event for an element of the
* eventspec list */
if (Tcl_ListObjGetElements (interp, obj,
&listc, &listv) != TCL_OK) {
return TCL_ERROR;
}
if (listc < 1) {
Tcl_AppendResult(interp, "bad ", objName, " list: is empty",
(char *) NULL);
return TCL_ERROR;
}
events = 0;
while (listc > 0) {
if (Tcl_GetIndexFromObj (interp, listv [listc-1],
eventOptions, objName, 0, &evIndex) != TCL_OK) {
return TCL_ERROR;
}
switch (evIndex) {
case EVENT_READ: events |= TCL_READABLE; break;
case EVENT_WRITE: events |= TCL_WRITABLE; break;
}
listc --;
}
*mask = events;
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* RcDecodeEventMask --
*
* This function takes an internal bitmask of events and
* constructs the equivalent list of event items.
*
* Results:
* A Tcl_Obj reference. The object will have a refCount of
* one. The user has to decrement it to release the object.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
static Tcl_Obj*
RcDecodeEventMask (mask)
{
Tcl_Obj* evObj = Tcl_NewStringObj (((mask & RANDW) == RANDW) ?
"read write" :
((mask & TCL_READABLE) ?
"read" :
((mask & TCL_WRITABLE) ?
"write" : "")), -1);
if (evObj == (Tcl_Obj*) NULL) {
Tcl_Panic ("Out of memory in RcDecodeEventMask");
}
Tcl_IncrRefCount (evObj);
return evObj;
}
/*
*----------------------------------------------------------------------
*
* RcNew --
*
* This function is invoked to allocate and initialize the
* instance data of a new reflected channel.
*
* Results:
* A heap-allocated channel instance.
*
* Side effects:
* Allocates memory.
*
*----------------------------------------------------------------------
*/
static ReflectingChannel*
RcNew (interp, cmdpfxObj, mode, id)
Tcl_Interp* interp;
Tcl_Obj* cmdpfxObj;
int mode;
Tcl_Obj* id;
{
ReflectingChannel* rcPtr;
int listc;
Tcl_Obj** listv;
Tcl_Obj* word;
int i;
rcPtr = (ReflectingChannel*) ckalloc (sizeof(ReflectingChannel));
/* rcPtr->chan : Assigned by caller. Dummy data here. */
/* rcPtr->methods : Assigned by caller. Dummy data here. */
rcPtr->chan = (Tcl_Channel) NULL;
rcPtr->methods = 0;
rcPtr->interp = interp;
#ifdef TCL_THREADS
rcPtr->thread = Tcl_GetCurrentThread ();
#endif
rcPtr->mode = mode;
rcPtr->interest = 0; /* Initially no interest registered */
/* Method placeholder */
/* ASSERT: cmdpfxObj is a Tcl List */
Tcl_ListObjGetElements (interp, cmdpfxObj, &listc, &listv);
/* See [==] as well.
* Storage for the command prefix and the additional words required
* for the invocation of methods in the command handler.
*
* listv [0] [listc-1] | [listc] [listc+1] |
* argv [0] ... [.] | [argc-2] [argc-1] | [argc] [argc+2]
* cmd ... pfx | method chan | detail1 detail2
*/
rcPtr->argc = listc + 2;
rcPtr->argv = (Tcl_Obj**) ckalloc (sizeof (Tcl_Obj*) * (listc+4));
for (i = 0; i < listc ; i++) {
word = rcPtr->argv [i] = listv [i];
Tcl_IncrRefCount (word);
}
i++; /* Skip placeholder for method */
rcPtr->argv [i] = id ; Tcl_IncrRefCount (id);
/* The next two objects are kept empty, varying arguments */
/* Initialization complete */
return rcPtr;
}
/*
*----------------------------------------------------------------------
*
* RcNewHandle --
*
* This function is invoked to generate a channel handle for
* a new reflected channel.
*
* Results:
* A Tcl_Obj containing the string of the new channel handle.
* The refcount of the returned object is -- zero --.
*
* Side effects:
* May allocate memory. Mutex protected critical section
* locks out other threads for a short time.
*
*----------------------------------------------------------------------
*/
Tcl_Obj*
RcNewHandle ()
{
/* Count number of generated reflected channels. Used for id
* generation. Ids are never reclaimed and there is no dealing
* with wrap around. On the other hand, "unsigned long" should be
* big enough except for absolute longrunners (generate a 100 ids
* per second => overflow will occur in 1 1/3 years).
*/
#ifdef TCL_THREADS
TCL_DECLARE_MUTEX (rcCounterMutex)
#endif
static unsigned long rcCounter = 0;
char channelName [50];
Tcl_Obj* res = Tcl_NewStringObj ("rc", -1);
#ifdef TCL_THREADS
Tcl_MutexLock (&rcCounterMutex);
#endif
sprintf (channelName, "%lu", (unsigned long) rcCounter);
rcCounter ++;
#ifdef TCL_THREADS
Tcl_MutexUnlock (&rcCounterMutex);
#endif
Tcl_AppendStringsToObj (res, channelName, (char*) NULL);
return res;
}
static void
RcFree (rcPtr)
ReflectingChannel* rcPtr;
{
Channel* chanPtr = (Channel*) rcPtr->chan;
int i, n;
if (chanPtr->typePtr != &tclRChannelType) {
/* Delete a cloned ChannelType structure. */
ckfree ((char*) chanPtr->typePtr);
}
n = rcPtr->argc - 2;
for (i = 0; i < n; i++) {
Tcl_DecrRefCount (rcPtr->argv[i]);
}
ckfree ((char*) rcPtr->argv);
ckfree ((char*) rcPtr);
return;
}
/*
*----------------------------------------------------------------------
*
* RcInvokeTclMethod --
*
* This function is used to invoke the Tcl level of a reflected
* channel. It handles all the command assembly, invokation, and
* generic state and result mgmt.
*
* Results:
* Result code and data as returned by the method.
*
* Side effects:
* Arbitrary, as it calls upo na Tcl script.
*
*----------------------------------------------------------------------
*/
static void
RcInvokeTclMethod (rcPtr, method, argone, argtwo, result, resultObj, capture)
ReflectingChannel* rcPtr;
CONST char* method;
Tcl_Obj* argone; /* NULL'able */
Tcl_Obj* argtwo; /* NULL'able */
int* result; /* NULL'able */
Tcl_Obj** resultObj; /* NULL'able */
int capture;
{
/* Thread redirection was done by higher layers */
/* ASSERT: Tcl_GetCurrentThread () == rcPtr->thread */
int cmdc; /* #words in constructed command */
Tcl_Obj* methObj = NULL; /* Method name in object form */
Tcl_InterpState sr; /* State of handler interp */
int res; /* Result code of method invokation */
Tcl_Obj* resObj = NULL; /* Result of method invokation. */
/* NOTE (5): Decide impl. issue: Cache objects with method names ?
* NOTE (5): Requires TSD data as reflections can be created in
* NOTE (5): many different threads.
* NOTE (5): ---
*/
/* Insert method into the pre-allocated area, after the command
* prefix, before the channel id.
*/
methObj = Tcl_NewStringObj (method, -1);
if (methObj == (Tcl_Obj*) NULL) {
Tcl_Panic ("Out of memory in RcInvokeTclMethod");
}
Tcl_IncrRefCount (methObj);
rcPtr->argv [rcPtr->argc - 2] = methObj;
/* Append the additional argument containing method specific
* details behind the channel id. If specified.
*/
cmdc = rcPtr->argc ;
if (argone) {
Tcl_IncrRefCount (argone);
rcPtr->argv [cmdc] = argone;
cmdc++;
}
if (argtwo) {
Tcl_IncrRefCount (argtwo);
rcPtr->argv [cmdc] = argtwo;
cmdc++;
}
/* And run the handler ... This is done in auch a manner which
* leaves any existing state intact.
*/
sr = Tcl_SaveInterpState (rcPtr->interp, 0 /* Dummy */);
res = Tcl_EvalObjv (rcPtr->interp, cmdc, rcPtr->argv, TCL_EVAL_GLOBAL);
/* We do not try to extract the result information if the caller has no
* interest in it. I.e. there is no need to put effort into creating
* something which is discarded immediately after.
*/
if (resultObj) {
if ((res == TCL_OK) || !capture) {
/* Ok result taken as is, also if the caller requests that there
* is no capture.
*/
resObj = Tcl_GetObjResult (rcPtr->interp);
} else {
/* Non-ok ressult is always treated as an error.
* We have to capture the full state of the result,
* including additional options.
*/
res = TCL_ERROR;
resObj = RcErrorMarshall (rcPtr->interp);
}
Tcl_IncrRefCount(resObj);
}
Tcl_RestoreInterpState (rcPtr->interp, sr);
/* ... */
/* Cleanup of the dynamic parts of the command */
Tcl_DecrRefCount (methObj);
if (argone) {Tcl_DecrRefCount (argone);}
if (argtwo) {Tcl_DecrRefCount (argtwo);}
/* The resObj has a ref count of 1 at this location. This means
* that the caller of RcInvoke has to dispose of it (but only if
* it was returned to it).
*/
if (result) {
*result = res;
}
if (resultObj) {
*resultObj = resObj;
}
/* There no need to handle the case where nothing is returned, because for
* that case resObj was not set anyway.
*/
}
#ifdef TCL_THREADS
static void
RcForwardOp (rcPtr, op, dst, param)
ReflectingChannel* rcPtr; /* Channel instance */
RcOperation op; /* Forwarded driver operation */
Tcl_ThreadId dst; /* Destination thread */
CONST VOID* param; /* Arguments */
{
RcForwardingEvent* evPtr;
RcForwardingResult* resultPtr;
int result;
/* Create and initialize the event and data structures */
evPtr = (RcForwardingEvent*) ckalloc (sizeof (RcForwardingEvent));
resultPtr = (RcForwardingResult*) ckalloc (sizeof (RcForwardingResult));
evPtr->event.proc = RcForwardProc;
evPtr->resultPtr = resultPtr;
evPtr->op = op;
evPtr->rcPtr = rcPtr;
evPtr->param = param;
resultPtr->src = Tcl_GetCurrentThread ();
resultPtr->dst = dst;
resultPtr->done = (Tcl_Condition) NULL;
resultPtr->result = -1;
resultPtr->evPtr = evPtr;
/* Now execute the forward */
Tcl_MutexLock(&rcForwardMutex);
TclSpliceIn(resultPtr, forwardList);
/*
* Ensure cleanup of the event if any of the two involved threads
* exits while this event is pending or in progress.
*/
Tcl_CreateThreadExitHandler(RcSrcExitProc, (ClientData) evPtr);
Tcl_CreateThreadExitHandler(RcDstExitProc, (ClientData) evPtr);
/*
* Queue the event and poke the other thread's notifier.
*/
Tcl_ThreadQueueEvent(dst, (Tcl_Event*)evPtr, TCL_QUEUE_TAIL);
Tcl_ThreadAlert(dst);
/*
* (*) Block until the other thread has either processed the transfer
* or rejected it.
*/
while (resultPtr->result < 0) {
/* NOTE (1): Is it possible that the current thread goes away while waiting here ?
* NOTE (1): IOW Is it possible that "RcSrcExitProc" is called while we are here ?
* NOTE (1): See complementary note (2) in "RcSrcExitProc"
* NOTE (1): ---
*/
Tcl_ConditionWait(&resultPtr->done, &rcForwardMutex, NULL);
}
/*
* Unlink result from the forwarder list.
*/
TclSpliceOut(resultPtr, forwardList);
resultPtr->nextPtr = NULL;
resultPtr->prevPtr = NULL;
Tcl_MutexUnlock(&rcForwardMutex);
Tcl_ConditionFinalize(&resultPtr->done);
/*
* Kill the cleanup handlers now, and the result structure as well,
* before returning the success code.
*
* Note: The event structure has already been deleted.
*/
Tcl_DeleteThreadExitHandler(RcSrcExitProc, (ClientData) evPtr);
Tcl_DeleteThreadExitHandler(RcDstExitProc, (ClientData) evPtr);
result = resultPtr->result;
ckfree ((char*) resultPtr);
}
static int
RcForwardProc (evGPtr, mask)
Tcl_Event *evGPtr;
int mask;
{
/* Notes regarding access to the referenced data.
*
* In principle the data belongs to the originating thread (see
* evPtr->src), however this thread is currently blocked at (*),
* i.e. quiescent. Because of this we can treat the data as
* belonging to us, without fear of race conditions. I.e. we can
* read and write as we like.
*
* The only thing we cannot be sure of is the resultPtr. This can be
* be NULLed if the originating thread went away while the event
* is handled here now.
*/
RcForwardingEvent* evPtr = (RcForwardingEvent*) evGPtr;
RcForwardingResult* resultPtr = evPtr->resultPtr;
ReflectingChannel* rcPtr = evPtr->rcPtr;
Tcl_Interp* interp = rcPtr->interp;
RcForwardParamBase* paramPtr = (RcForwardParamBase*) evPtr->param;
int res = TCL_OK; /* Result code of RcInvokeTclMethod */
Tcl_Obj* resObj = NULL; /* Interp result of RcInvokeTclMethod */
/* Ignore the event if no one is waiting for its result anymore.
*/
if (!resultPtr) {
return 1;
}
paramPtr->code = TCL_OK;
paramPtr->msg = NULL;
paramPtr->vol = 0;
switch (evPtr->op) {
/* The destination thread for the following operations is
* rcPtr->thread, which contains rcPtr->interp, the interp
* we have to call upon for the driver.
*/
case RcOpClose:
{
/* No parameters/results */
RcInvokeTclMethod (rcPtr, "finalize", NULL, NULL,
&res, &resObj, DO_CAPTURE);
if (res != TCL_OK) {
RcForwardSetObjError (paramPtr, resObj);
}
/* Freeing is done here, in the origin thread, because the
* argv[] objects belong to this thread. Deallocating them
* in a different thread is not allowed
*/
RcFree (rcPtr);
}
break;
case RcOpInput:
{
RcForwardParamInput* p = (RcForwardParamInput*) paramPtr;
Tcl_Obj* toReadObj = Tcl_NewIntObj (p->toRead);
if (toReadObj == (Tcl_Obj*) NULL) {
Tcl_Panic ("Out of memory in RcInput");
}
RcInvokeTclMethod (rcPtr, "read", toReadObj, NULL,
&res, &resObj, DO_CAPTURE);
if (res != TCL_OK) {
RcForwardSetObjError (paramPtr, resObj);
p->toRead = -1;
} else {
/* Process a regular result. */
int bytec; /* Number of returned bytes */
unsigned char* bytev; /* Array of returned bytes */
bytev = Tcl_GetByteArrayFromObj(resObj, &bytec);
if (p->toRead < bytec) {
RcForwardSetStaticError (paramPtr, msg_read_toomuch);
p->toRead = -1;
} else {
if (bytec > 0) {
memcpy (p->buf, bytev, bytec);
}
p->toRead = bytec;
}
}
}
break;
case RcOpOutput:
{
RcForwardParamOutput* p = (RcForwardParamOutput*) paramPtr;
Tcl_Obj* bufObj = Tcl_NewByteArrayObj((unsigned char*) p->buf, p->toWrite);
if (bufObj == (Tcl_Obj*) NULL) {
Tcl_Panic ("Out of memory in RcOutput");
}
RcInvokeTclMethod (rcPtr, "write", bufObj, NULL,
&res, &resObj, DO_CAPTURE);
if (res != TCL_OK) {
RcForwardSetObjError (paramPtr, resObj);
p->toWrite = -1;
} else {
/* Process a regular result. */
int written;
res = Tcl_GetIntFromObj (interp, resObj, &written);
if (res != TCL_OK) {
RcForwardSetObjError (paramPtr, RcErrorMarshall (interp));
p->toWrite = -1;
} else if ((written == 0) || (p->toWrite < written)) {
RcForwardSetStaticError (paramPtr, msg_write_toomuch);
p->toWrite = -1;
} else {
p->toWrite = written;
}
}
}
break;
case RcOpSeek:
{
RcForwardParamSeek* p = (RcForwardParamSeek*) paramPtr;
Tcl_Obj* offObj;
Tcl_Obj* baseObj;
offObj = Tcl_NewWideIntObj(p->offset);
if (offObj == (Tcl_Obj*) NULL) {
Tcl_Panic ("Out of memory in RcSeekWide");
}
baseObj = Tcl_NewStringObj((p->seekMode == SEEK_SET) ?
"start" :
((p->seekMode == SEEK_CUR) ?
"current" :
"end"), -1);
if (baseObj == (Tcl_Obj*) NULL) {
Tcl_Panic ("Out of memory in RcSeekWide");
}
RcInvokeTclMethod (rcPtr, "seek", offObj, baseObj,
&res, &resObj, DO_CAPTURE);
if (res != TCL_OK) {
RcForwardSetObjError (paramPtr, resObj);
p->offset = -1;
} else {
/* Process a regular result. If the type is wrong this
* may change into an error.
*/
Tcl_WideInt newLoc;
res = Tcl_GetWideIntFromObj (interp, resObj, &newLoc);
if (res == TCL_OK) {
if (newLoc < Tcl_LongAsWide (0)) {
RcForwardSetStaticError (paramPtr, msg_seek_beforestart);
p->offset = -1;
} else {
p->offset = newLoc;
}
} else {
RcForwardSetObjError (paramPtr, RcErrorMarshall (interp));
p->offset = -1;
}
}
}
break;
case RcOpWatch:
{
RcForwardParamWatch* p = (RcForwardParamWatch*) paramPtr;
Tcl_Obj* maskObj = RcDecodeEventMask (p->mask);
RcInvokeTclMethod (rcPtr, "watch", maskObj, NULL,
NULL, NULL, NO_CAPTURE);
Tcl_DecrRefCount (maskObj);
}
break;
case RcOpBlock:
{
RcForwardParamBlock* p = (RcForwardParamBlock*) evPtr->param;
Tcl_Obj* blockObj = Tcl_NewBooleanObj(!p->nonblocking);
if (blockObj == (Tcl_Obj*) NULL) {
Tcl_Panic ("Out of memory in RcBlock");
}
RcInvokeTclMethod (rcPtr, "blocking", blockObj, NULL,
&res, &resObj, DO_CAPTURE);
if (res != TCL_OK) {
RcForwardSetObjError (paramPtr, resObj);
}
}
break;
case RcOpSetOpt:
{
RcForwardParamSetOpt* p = (RcForwardParamSetOpt*) paramPtr;
Tcl_Obj* optionObj;
Tcl_Obj* valueObj;
optionObj = Tcl_NewStringObj(p->name,-1);
if (optionObj == (Tcl_Obj*) NULL) {
Tcl_Panic ("Out of memory in RcSetOption");
}
valueObj = Tcl_NewStringObj(p->value,-1);
if (valueObj == (Tcl_Obj*) NULL) {
Tcl_Panic ("Out of memory in RcSetOption");
}
RcInvokeTclMethod (rcPtr, "configure", optionObj, valueObj,
&res, &resObj, DO_CAPTURE);
if (res != TCL_OK) {
RcForwardSetObjError (paramPtr, resObj);
}
}
break;
case RcOpGetOpt:
{
/* Retrieve the value of one option */
RcForwardParamGetOpt* p = (RcForwardParamGetOpt*) paramPtr;
Tcl_Obj* optionObj;
optionObj = Tcl_NewStringObj(p->name,-1);
if (optionObj == (Tcl_Obj*) NULL) {
Tcl_Panic ("Out of memory in RcGetOption");
}
RcInvokeTclMethod (rcPtr, "cget", optionObj, NULL,
&res, &resObj, DO_CAPTURE);
if (res != TCL_OK) {
RcForwardSetObjError (paramPtr, resObj);
} else {
Tcl_DStringAppend (p->value, Tcl_GetString (resObj), -1);
}
}
break;
case RcOpGetOptAll:
{
/* Retrieve all options. */
RcForwardParamGetOpt* p = (RcForwardParamGetOpt*) paramPtr;
RcInvokeTclMethod (rcPtr, "cgetall", NULL, NULL,
&res, &resObj, DO_CAPTURE);
if (res != TCL_OK) {
RcForwardSetObjError (paramPtr, resObj);
} else {
/* Extract list, validate that it is a list, and
* #elements. See NOTE (4) as well.
*/
int listc;
Tcl_Obj** listv;
res = Tcl_ListObjGetElements (interp, resObj, &listc, &listv);
if (res != TCL_OK) {
RcForwardSetObjError (paramPtr, RcErrorMarshall (interp));
} else if ((listc % 2) == 1) {
/* Odd number of elements is wrong.
* [x].
*/
char* buf = ckalloc (200);
sprintf (buf,
"{Expected list with even number of elements, got %d %s instead}",
listc,
(listc == 1 ? "element" : "elements"));
RcForwardSetDynError (paramPtr, buf);
} else {
int len;
char* str = Tcl_GetStringFromObj (resObj, &len);
if (len) {
Tcl_DStringAppend (p->value, " ", 1);
Tcl_DStringAppend (p->value, str, len);
}
}
}
}
break;
default:
/* Bad operation code */
Tcl_Panic ("Bad operation code in RcForwardProc");
break;
}
/* Remove the reference we held on the result of the invoke, if we had
* such
*/
if (resObj != NULL) {
Tcl_DecrRefCount (resObj);
}
if (resultPtr) {
/*
* Report the forwarding result synchronously to the waiting
* caller. This unblocks (*) as well. This is wrapped into a
* conditional because the caller may have exited in the mean
* time.
*/
Tcl_MutexLock(&rcForwardMutex);
resultPtr->result = TCL_OK;
Tcl_ConditionNotify(&resultPtr->done);
Tcl_MutexUnlock(&rcForwardMutex);
}
return 1;
}
static void
RcSrcExitProc (clientData)
ClientData clientData;
{
RcForwardingEvent* evPtr = (RcForwardingEvent*) clientData;
RcForwardingResult* resultPtr;
RcForwardParamBase* paramPtr;
/* NOTE (2): Can this handler be called with the originator blocked ?
* NOTE (2): ---
*/
/* The originator for the event exited. It is not sure if this
* can happen, as the originator should be blocked at (*) while
* the event is in transit/pending.
*/
/*
* We make sure that the event cannot refer to the result anymore,
* remove it from the list of pending results and free the
* structure. Locking the access ensures that we cannot get in
* conflict with "RcForwardProc", should it already execute the
* event.
*/
Tcl_MutexLock(&rcForwardMutex);
resultPtr = evPtr->resultPtr;
paramPtr = (RcForwardParamBase*) evPtr->param;
evPtr->resultPtr = NULL;
resultPtr->evPtr = NULL;
resultPtr->result = TCL_ERROR;
RcForwardSetStaticError (paramPtr, msg_send_originlost);
/* See below: TclSpliceOut(resultPtr, forwardList); */
Tcl_MutexUnlock(&rcForwardMutex);
/*
* This unlocks (*). The structure will be spliced out and freed by
* "RcForwardProc". Maybe.
*/
Tcl_ConditionNotify(&resultPtr->done);
}
static void
RcDstExitProc (clientData)
ClientData clientData;
{
RcForwardingEvent* evPtr = (RcForwardingEvent*) clientData;
RcForwardingResult* resultPtr = evPtr->resultPtr;
RcForwardParamBase* paramPtr = (RcForwardParamBase*) evPtr->param;
/* NOTE (3): It is not clear if the event still exists when this handler is called..
* NOTE (3): We might have to use 'resultPtr' as our clientData instead.
* NOTE (3): ---
*/
/* The receiver for the event exited, before processing the
* event. We detach the result now, wake the originator up
* and signal failure.
*/
evPtr->resultPtr = NULL;
resultPtr->evPtr = NULL;
resultPtr->result = TCL_ERROR;
RcForwardSetStaticError (paramPtr, msg_send_dstlost);
Tcl_ConditionNotify(&resultPtr->done);
}
static void
RcForwardSetObjError (p,obj)
RcForwardParamBase* p;
Tcl_Obj* obj;
{
int len;
char* msg;
msg = Tcl_GetStringFromObj (obj, &len);
p->code = TCL_ERROR;
p->vol = 1;
p->msg = strcpy(ckalloc (1+len), msg);
}
#endif
/*
* Local Variables:
* mode: c
* c-basic-offset: 4
* fill-column: 78
* End:
*/
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