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archie/tk4.2/generic/tkSend.c

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Update tcl/tk for tcl-dp
2024-05-27 16:40:40 +02:00
/*
* tkSend.c --
*
* This file provides procedures that implement the "send"
* command, allowing commands to be passed from interpreter
* to interpreter.
*
* Copyright (c) 1989-1994 The Regents of the University of California.
* Copyright (c) 1994-1996 Sun Microsystems, Inc.
*
* See the file "license.terms" for information on usage and redistribution
* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
*
* SCCS: @(#) tkSend.c 1.64 96/07/20 17:38:32
*/
#include "tkPort.h"
#include "tkInt.h"
/*
* The following structure is used to keep track of the interpreters
* registered by this process.
*/
typedef struct RegisteredInterp {
char *name; /* Interpreter's name (malloc-ed). */
Tcl_Interp *interp; /* Interpreter associated with name. NULL
* means that the application was unregistered
* or deleted while a send was in progress
* to it. */
TkDisplay *dispPtr; /* Display for the application. Needed
* because we may need to unregister the
* interpreter after its main window has
* been deleted. */
struct RegisteredInterp *nextPtr;
/* Next in list of names associated
* with interps in this process.
* NULL means end of list. */
} RegisteredInterp;
static RegisteredInterp *registry = NULL;
/* List of all interpreters
* registered by this process. */
/*
* A registry of all interpreters for a display is kept in a
* property "InterpRegistry" on the root window of the display.
* It is organized as a series of zero or more concatenated strings
* (in no particular order), each of the form
* window space name '\0'
* where "window" is the hex id of the comm. window to use to talk
* to an interpreter named "name".
*
* When the registry is being manipulated by an application (e.g. to
* add or remove an entry), it is loaded into memory using a structure
* of the following type:
*/
typedef struct NameRegistry {
TkDisplay *dispPtr; /* Display from which the registry was
* read. */
int locked; /* Non-zero means that the display was
* locked when the property was read in. */
int modified; /* Non-zero means that the property has
* been modified, so it needs to be written
* out when the NameRegistry is closed. */
unsigned long propLength; /* Length of the property, in bytes. */
char *property; /* The contents of the property, or NULL
* if none. See format description above;
* this is *not* terminated by the first
* null character. Dynamically allocated. */
int allocedByX; /* Non-zero means must free property with
* XFree; zero means use ckfree. */
} NameRegistry;
/*
* When a result is being awaited from a sent command, one of
* the following structures is present on a list of all outstanding
* sent commands. The information in the structure is used to
* process the result when it arrives. You're probably wondering
* how there could ever be multiple outstanding sent commands.
* This could happen if interpreters invoke each other recursively.
* It's unlikely, but possible.
*/
typedef struct PendingCommand {
int serial; /* Serial number expected in
* result. */
TkDisplay *dispPtr; /* Display being used for communication. */
char *target; /* Name of interpreter command is
* being sent to. */
Window commWindow; /* Target's communication window. */
Tcl_Interp *interp; /* Interpreter from which the send
* was invoked. */
int code; /* Tcl return code for command
* will be stored here. */
char *result; /* String result for command (malloc'ed),
* or NULL. */
char *errorInfo; /* Information for "errorInfo" variable,
* or NULL (malloc'ed). */
char *errorCode; /* Information for "errorCode" variable,
* or NULL (malloc'ed). */
int gotResponse; /* 1 means a response has been received,
* 0 means the command is still outstanding. */
struct PendingCommand *nextPtr;
/* Next in list of all outstanding
* commands. NULL means end of
* list. */
} PendingCommand;
static PendingCommand *pendingCommands = NULL;
/* List of all commands currently
* being waited for. */
/*
* The information below is used for communication between processes
* during "send" commands. Each process keeps a private window, never
* even mapped, with one property, "Comm". When a command is sent to
* an interpreter, the command is appended to the comm property of the
* communication window associated with the interp's process. Similarly,
* when a result is returned from a sent command, it is also appended
* to the comm property.
*
* Each command and each result takes the form of ASCII text. For a
* command, the text consists of a zero character followed by several
* null-terminated ASCII strings. The first string consists of the
* single letter "c". Subsequent strings have the form "option value"
* where the following options are supported:
*
* -r commWindow serial
*
* This option means that a response should be sent to the window
* whose X identifier is "commWindow" (in hex), and the response should
* be identified with the serial number given by "serial" (in decimal).
* If this option isn't specified then the send is asynchronous and
* no response is sent.
*
* -n name
* "Name" gives the name of the application for which the command is
* intended. This option must be present.
*
* -s script
*
* "Script" is the script to be executed. This option must be present.
*
* The options may appear in any order. The -n and -s options must be
* present, but -r may be omitted for asynchronous RPCs. For compatibility
* with future releases that may add new features, there may be additional
* options present; as long as they start with a "-" character, they will
* be ignored.
*
* A result also consists of a zero character followed by several null-
* terminated ASCII strings. The first string consists of the single
* letter "r". Subsequent strings have the form "option value" where
* the following options are supported:
*
* -s serial
*
* Identifies the command for which this is the result. It is the
* same as the "serial" field from the -s option in the command. This
* option must be present.
*
* -c code
*
* "Code" is the completion code for the script, in decimal. If the
* code is omitted it defaults to TCL_OK.
*
* -r result
*
* "Result" is the result string for the script, which may be either
* a result or an error message. If this field is omitted then it
* defaults to an empty string.
*
* -i errorInfo
*
* "ErrorInfo" gives a string with which to initialize the errorInfo
* variable. This option may be omitted; it is ignored unless the
* completion code is TCL_ERROR.
*
* -e errorCode
*
* "ErrorCode" gives a string with with to initialize the errorCode
* variable. This option may be omitted; it is ignored unless the
* completion code is TCL_ERROR.
*
* Options may appear in any order, and only the -s option must be
* present. As with commands, there may be additional options besides
* these; unknown options are ignored.
*/
/*
* The following variable is the serial number that was used in the
* last "send" command. It is exported only for testing purposes.
*/
int tkSendSerial = 0;
/*
* Maximum size property that can be read at one time by
* this module:
*/
#define MAX_PROP_WORDS 100000
/*
* The following variable can be set while debugging to do things like
* skip locking the server.
*/
static int sendDebug = 0;
/*
* Forward declarations for procedures defined later in this file:
*/
static int AppendErrorProc _ANSI_ARGS_((ClientData clientData,
XErrorEvent *errorPtr));
static void AppendPropCarefully _ANSI_ARGS_((Display *display,
Window window, Atom property, char *value,
int length, PendingCommand *pendingPtr));
static void DeleteProc _ANSI_ARGS_((ClientData clientData));
static void RegAddName _ANSI_ARGS_((NameRegistry *regPtr,
char *name, Window commWindow));
static void RegClose _ANSI_ARGS_((NameRegistry *regPtr));
static void RegDeleteName _ANSI_ARGS_((NameRegistry *regPtr,
char *name));
static Window RegFindName _ANSI_ARGS_((NameRegistry *regPtr,
char *name));
static NameRegistry * RegOpen _ANSI_ARGS_((Tcl_Interp *interp,
TkDisplay *dispPtr, int lock));
static void SendEventProc _ANSI_ARGS_((ClientData clientData,
XEvent *eventPtr));
static int SendInit _ANSI_ARGS_((Tcl_Interp *interp,
TkDisplay *dispPtr));
static Tk_RestrictAction SendRestrictProc _ANSI_ARGS_((ClientData clientData,
XEvent *eventPtr));
static int ServerSecure _ANSI_ARGS_((TkDisplay *dispPtr));
static void TimeoutProc _ANSI_ARGS_((ClientData clientData));
static void UpdateCommWindow _ANSI_ARGS_((TkDisplay *dispPtr));
static int ValidateName _ANSI_ARGS_((TkDisplay *dispPtr,
char *name, Window commWindow, int oldOK));
/*
*----------------------------------------------------------------------
*
* RegOpen --
*
* This procedure loads the name registry for a display into
* memory so that it can be manipulated.
*
* Results:
* The return value is a pointer to the loaded registry.
*
* Side effects:
* If "lock" is set then the server will be locked. It is the
* caller's responsibility to call RegClose when finished with
* the registry, so that we can write back the registry if
* neeeded, unlock the server if needed, and free memory.
*
*----------------------------------------------------------------------
*/
static NameRegistry *
RegOpen(interp, dispPtr, lock)
Tcl_Interp *interp; /* Interpreter to use for error reporting
* (errors cause a panic so in fact no
* error is ever returned, but the interpreter
* is needed anyway). */
TkDisplay *dispPtr; /* Display whose name registry is to be
* opened. */
int lock; /* Non-zero means lock the window server
* when opening the registry, so no-one
* else can use the registry until we
* close it. */
{
NameRegistry *regPtr;
int result, actualFormat;
unsigned long bytesAfter;
Atom actualType;
if (dispPtr->commTkwin == NULL) {
SendInit(interp, dispPtr);
}
regPtr = (NameRegistry *) ckalloc(sizeof(NameRegistry));
regPtr->dispPtr = dispPtr;
regPtr->locked = 0;
regPtr->modified = 0;
regPtr->allocedByX = 1;
if (lock && !sendDebug) {
XGrabServer(dispPtr->display);
regPtr->locked = 1;
}
/*
* Read the registry property.
*/
result = XGetWindowProperty(dispPtr->display,
RootWindow(dispPtr->display, 0),
dispPtr->registryProperty, 0, MAX_PROP_WORDS,
False, XA_STRING, &actualType, &actualFormat,
&regPtr->propLength, &bytesAfter,
(unsigned char **) &regPtr->property);
if (actualType == None) {
regPtr->propLength = 0;
regPtr->property = NULL;
} else if ((result != Success) || (actualFormat != 8)
|| (actualType != XA_STRING)) {
/*
* The property is improperly formed; delete it.
*/
if (regPtr->property != NULL) {
XFree(regPtr->property);
regPtr->propLength = 0;
regPtr->property = NULL;
}
XDeleteProperty(dispPtr->display,
RootWindow(dispPtr->display, 0),
dispPtr->registryProperty);
}
/*
* Xlib placed an extra null byte after the end of the property, just
* to make sure that it is always NULL-terminated. Be sure to include
* this byte in our count if it's needed to ensure null termination
* (note: as of 8/95 I'm no longer sure why this code is needed; seems
* like it shouldn't be).
*/
if ((regPtr->propLength > 0)
&& (regPtr->property[regPtr->propLength-1] != 0)) {
regPtr->propLength++;
}
return regPtr;
}
/*
*----------------------------------------------------------------------
*
* RegFindName --
*
* Given an open name registry, this procedure finds an entry
* with a given name, if there is one, and returns information
* about that entry.
*
* Results:
* The return value is the X identifier for the comm window for
* the application named "name", or None if there is no such
* entry in the registry.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
static Window
RegFindName(regPtr, name)
NameRegistry *regPtr; /* Pointer to a registry opened with a
* previous call to RegOpen. */
char *name; /* Name of an application. */
{
char *p, *entry;
Window commWindow;
commWindow = None;
for (p = regPtr->property; (p-regPtr->property) < regPtr->propLength; ) {
entry = p;
while ((*p != 0) && (!isspace(UCHAR(*p)))) {
p++;
}
if ((*p != 0) && (strcmp(name, p+1) == 0)) {
if (sscanf(entry, "%x", (unsigned int *) &commWindow) == 1) {
return commWindow;
}
}
while (*p != 0) {
p++;
}
p++;
}
return None;
}
/*
*----------------------------------------------------------------------
*
* RegDeleteName --
*
* This procedure deletes the entry for a given name from
* an open registry.
*
* Results:
* None.
*
* Side effects:
* If there used to be an entry named "name" in the registry,
* then it is deleted and the registry is marked as modified
* so it will be written back when closed.
*
*----------------------------------------------------------------------
*/
static void
RegDeleteName(regPtr, name)
NameRegistry *regPtr; /* Pointer to a registry opened with a
* previous call to RegOpen. */
char *name; /* Name of an application. */
{
char *p, *entry, *entryName;
int count;
for (p = regPtr->property; (p-regPtr->property) < regPtr->propLength; ) {
entry = p;
while ((*p != 0) && (!isspace(UCHAR(*p)))) {
p++;
}
if (*p != 0) {
p++;
}
entryName = p;
while (*p != 0) {
p++;
}
p++;
if ((strcmp(name, entryName) == 0)) {
/*
* Found the matching entry. Copy everything after it
* down on top of it.
*/
count = regPtr->propLength - (p - regPtr->property);
if (count > 0) {
memmove((VOID *) entry, (VOID *) p, (size_t) count);
}
regPtr->propLength -= p - entry;
regPtr->modified = 1;
return;
}
}
}
/*
*----------------------------------------------------------------------
*
* RegAddName --
*
* Add a new entry to an open registry.
*
* Results:
* None.
*
* Side effects:
* The open registry is expanded; it is marked as modified so that
* it will be written back when closed.
*
*----------------------------------------------------------------------
*/
static void
RegAddName(regPtr, name, commWindow)
NameRegistry *regPtr; /* Pointer to a registry opened with a
* previous call to RegOpen. */
char *name; /* Name of an application. The caller
* must ensure that this name isn't
* already registered. */
Window commWindow; /* X identifier for comm. window of
* application. */
{
char id[30];
char *newProp;
int idLength, newBytes;
sprintf(id, "%x ", (unsigned int) commWindow);
idLength = strlen(id);
newBytes = idLength + strlen(name) + 1;
newProp = (char *) ckalloc((unsigned) (regPtr->propLength + newBytes));
strcpy(newProp, id);
strcpy(newProp+idLength, name);
if (regPtr->property != NULL) {
memcpy((VOID *) (newProp + newBytes), (VOID *) regPtr->property,
regPtr->propLength);
if (regPtr->allocedByX) {
XFree(regPtr->property);
} else {
ckfree(regPtr->property);
}
}
regPtr->modified = 1;
regPtr->propLength += newBytes;
regPtr->property = newProp;
regPtr->allocedByX = 0;
}
/*
*----------------------------------------------------------------------
*
* RegClose --
*
* This procedure is called to end a series of operations on
* a name registry.
*
* Results:
* None.
*
* Side effects:
* The registry is written back if it has been modified, and the
* X server is unlocked if it was locked. Memory for the
* registry is freed, so the caller should never use regPtr
* again.
*
*----------------------------------------------------------------------
*/
static void
RegClose(regPtr)
NameRegistry *regPtr; /* Pointer to a registry opened with a
* previous call to RegOpen. */
{
if (regPtr->modified) {
if (!regPtr->locked && !sendDebug) {
panic("The name registry was modified without being locked!");
}
XChangeProperty(regPtr->dispPtr->display,
RootWindow(regPtr->dispPtr->display, 0),
regPtr->dispPtr->registryProperty, XA_STRING, 8,
PropModeReplace, (unsigned char *) regPtr->property,
(int) regPtr->propLength);
}
if (regPtr->locked) {
XUngrabServer(regPtr->dispPtr->display);
}
XFlush(regPtr->dispPtr->display);
if (regPtr->property != NULL) {
if (regPtr->allocedByX) {
XFree(regPtr->property);
} else {
ckfree(regPtr->property);
}
}
ckfree((char *) regPtr);
}
/*
*----------------------------------------------------------------------
*
* ValidateName --
*
* This procedure checks to see if an entry in the registry
* is still valid.
*
* Results:
* The return value is 1 if the given commWindow exists and its
* name is "name". Otherwise 0 is returned.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
static int
ValidateName(dispPtr, name, commWindow, oldOK)
TkDisplay *dispPtr; /* Display for which to perform the
* validation. */
char *name; /* The name of an application. */
Window commWindow; /* X identifier for the application's
* comm. window. */
int oldOK; /* Non-zero means that we should consider
* an application to be valid even if it
* looks like an old-style (pre-4.0) one;
* 0 means consider these invalid. */
{
int result, actualFormat, argc, i;
unsigned long length, bytesAfter;
Atom actualType;
char *property;
Tk_ErrorHandler handler;
char **argv;
property = NULL;
/*
* Ignore X errors when reading the property (e.g., the window
* might not exist). If an error occurs, result will be some
* value other than Success.
*/
handler = Tk_CreateErrorHandler(dispPtr->display, -1, -1, -1,
(Tk_ErrorProc *) NULL, (ClientData) NULL);
result = XGetWindowProperty(dispPtr->display, commWindow,
dispPtr->appNameProperty, 0, MAX_PROP_WORDS,
False, XA_STRING, &actualType, &actualFormat,
&length, &bytesAfter, (unsigned char **) &property);
if ((result == Success) && (actualType == None)) {
XWindowAttributes atts;
/*
* The comm. window exists but the property we're looking for
* doesn't exist. This probably means that the application
* comes from an older version of Tk (< 4.0) that didn't set the
* property; if this is the case, then assume for compatibility's
* sake that everything's OK. However, it's also possible that
* some random application has re-used the window id for something
* totally unrelated. Check a few characteristics of the window,
* such as its dimensions and mapped state, to be sure that it
* still "smells" like a commWindow.
*/
if (!oldOK
|| !XGetWindowAttributes(dispPtr->display, commWindow, &atts)
|| (atts.width != 1) || (atts.height != 1)
|| (atts.map_state != IsUnmapped)) {
result = 0;
} else {
result = 1;
}
} else if ((result == Success) && (actualFormat == 8)
&& (actualType == XA_STRING)) {
result = 0;
if (Tcl_SplitList((Tcl_Interp *) NULL, property, &argc, &argv)
== TCL_OK) {
for (i = 0; i < argc; i++) {
if (strcmp(argv[i], name) == 0) {
result = 1;
break;
}
}
ckfree((char *) argv);
}
} else {
result = 0;
}
Tk_DeleteErrorHandler(handler);
if (property != NULL) {
XFree(property);
}
return result;
}
/*
*----------------------------------------------------------------------
*
* ServerSecure --
*
* Check whether a server is secure enough for us to trust
* Tcl scripts arriving via that server.
*
* Results:
* The return value is 1 if the server is secure, which means
* that host-style authentication is turned on but there are
* no hosts in the enabled list. This means that some other
* form of authorization (presumably more secure, such as xauth)
* is in use.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
static int
ServerSecure(dispPtr)
TkDisplay *dispPtr; /* Display to check. */
{
#ifdef TK_NO_SECURITY
return 1;
#else
XHostAddress *addrPtr;
int numHosts, secure;
Bool enabled;
secure = 0;
addrPtr = XListHosts(dispPtr->display, &numHosts, &enabled);
if (enabled && (numHosts == 0)) {
secure = 1;
}
if (addrPtr != NULL) {
XFree((char *) addrPtr);
}
return secure;
#endif /* TK_NO_SECURITY */
}
/*
*--------------------------------------------------------------
*
* Tk_SetAppName --
*
* This procedure is called to associate an ASCII name with a Tk
* application. If the application has already been named, the
* name replaces the old one.
*
* Results:
* The return value is the name actually given to the application.
* This will normally be the same as name, but if name was already
* in use for an application then a name of the form "name #2" will
* be chosen, with a high enough number to make the name unique.
*
* Side effects:
* Registration info is saved, thereby allowing the "send" command
* to be used later to invoke commands in the application. In
* addition, the "send" command is created in the application's
* interpreter. The registration will be removed automatically
* if the interpreter is deleted or the "send" command is removed.
*
*--------------------------------------------------------------
*/
char *
Tk_SetAppName(tkwin, name)
Tk_Window tkwin; /* Token for any window in the application
* to be named: it is just used to identify
* the application and the display. */
char *name; /* The name that will be used to
* refer to the interpreter in later
* "send" commands. Must be globally
* unique. */
{
RegisteredInterp *riPtr, *riPtr2;
Window w;
TkWindow *winPtr = (TkWindow *) tkwin;
TkDisplay *dispPtr;
NameRegistry *regPtr;
Tcl_Interp *interp;
char *actualName;
Tcl_DString dString;
int offset, i;
#ifdef __WIN32__
return name;
#endif /* __WIN32__ */
dispPtr = winPtr->dispPtr;
interp = winPtr->mainPtr->interp;
if (dispPtr->commTkwin == NULL) {
SendInit(interp, winPtr->dispPtr);
}
/*
* See if the application is already registered; if so, remove its
* current name from the registry.
*/
regPtr = RegOpen(interp, winPtr->dispPtr, 1);
for (riPtr = registry; ; riPtr = riPtr->nextPtr) {
if (riPtr == NULL) {
/*
* This interpreter isn't currently registered; create
* the data structure that will be used to register it locally,
* plus add the "send" command to the interpreter.
*/
riPtr = (RegisteredInterp *) ckalloc(sizeof(RegisteredInterp));
riPtr->interp = interp;
riPtr->dispPtr = winPtr->dispPtr;
riPtr->nextPtr = registry;
registry = riPtr;
Tcl_CreateCommand(interp, "send", Tk_SendCmd, (ClientData) riPtr,
DeleteProc);
break;
}
if (riPtr->interp == interp) {
/*
* The interpreter is currently registered; remove it from
* the name registry.
*/
RegDeleteName(regPtr, riPtr->name);
ckfree(riPtr->name);
break;
}
}
/*
* Pick a name to use for the application. Use "name" if it's not
* already in use. Otherwise add a suffix such as " #2", trying
* larger and larger numbers until we eventually find one that is
* unique.
*/
actualName = name;
offset = 0; /* Needed only to avoid "used before
* set" compiler warnings. */
for (i = 1; ; i++) {
if (i > 1) {
if (i == 2) {
Tcl_DStringInit(&dString);
Tcl_DStringAppend(&dString, name, -1);
Tcl_DStringAppend(&dString, " #", 2);
offset = Tcl_DStringLength(&dString);
Tcl_DStringSetLength(&dString, offset+10);
actualName = Tcl_DStringValue(&dString);
}
sprintf(actualName + offset, "%d", i);
}
w = RegFindName(regPtr, actualName);
if (w == None) {
break;
}
/*
* The name appears to be in use already, but double-check to
* be sure (perhaps the application died without removing its
* name from the registry?).
*/
if (w == Tk_WindowId(dispPtr->commTkwin)) {
for (riPtr2 = registry; riPtr2 != NULL; riPtr2 = riPtr2->nextPtr) {
if ((riPtr2->interp != interp) &&
(strcmp(riPtr2->name, actualName) == 0)) {
goto nextSuffix;
}
}
RegDeleteName(regPtr, actualName);
break;
} else if (!ValidateName(winPtr->dispPtr, actualName, w, 1)) {
RegDeleteName(regPtr, actualName);
break;
}
nextSuffix:
continue;
}
/*
* We've now got a name to use. Store it in the name registry and
* in the local entry for this application, plus put it in a property
* on the commWindow.
*/
RegAddName(regPtr, actualName, Tk_WindowId(dispPtr->commTkwin));
RegClose(regPtr);
riPtr->name = (char *) ckalloc((unsigned) (strlen(actualName) + 1));
strcpy(riPtr->name, actualName);
if (actualName != name) {
Tcl_DStringFree(&dString);
}
UpdateCommWindow(dispPtr);
return riPtr->name;
}
/*
*--------------------------------------------------------------
*
* Tk_SendCmd --
*
* This procedure is invoked to process the "send" Tcl command.
* See the user documentation for details on what it does.
*
* Results:
* A standard Tcl result.
*
* Side effects:
* See the user documentation.
*
*--------------------------------------------------------------
*/
int
Tk_SendCmd(clientData, interp, argc, argv)
ClientData clientData; /* Information about sender (only
* dispPtr field is used). */
Tcl_Interp *interp; /* Current interpreter. */
int argc; /* Number of arguments. */
char **argv; /* Argument strings. */
{
TkWindow *winPtr;
Window commWindow;
PendingCommand pending;
register RegisteredInterp *riPtr;
char *destName, buffer[30];
int result, c, async, i, firstArg;
size_t length;
Tk_RestrictProc *prevRestrictProc;
ClientData prevArg;
TkDisplay *dispPtr;
NameRegistry *regPtr;
Tcl_DString request;
Tcl_Interp *localInterp; /* Used when the interpreter to
* send the command to is within
* the same process. */
/*
* Process options, if any.
*/
async = 0;
winPtr = (TkWindow *) Tk_MainWindow(interp);
if (winPtr == NULL) {
return TCL_ERROR;
}
for (i = 1; i < (argc-1); ) {
if (argv[i][0] != '-') {
break;
}
c = argv[i][1];
length = strlen(argv[i]);
if ((c == 'a') && (strncmp(argv[i], "-async", length) == 0)) {
async = 1;
i++;
} else if ((c == 'd') && (strncmp(argv[i], "-displayof",
length) == 0)) {
winPtr = (TkWindow *) Tk_NameToWindow(interp, argv[i+1],
(Tk_Window) winPtr);
if (winPtr == NULL) {
return TCL_ERROR;
}
i += 2;
} else if (strcmp(argv[i], "--") == 0) {
i++;
break;
} else {
Tcl_AppendResult(interp, "bad option \"", argv[i],
"\": must be -async, -displayof, or --", (char *) NULL);
return TCL_ERROR;
}
}
if (argc < (i+2)) {
Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],
" ?options? interpName arg ?arg ...?\"", (char *) NULL);
return TCL_ERROR;
}
destName = argv[i];
firstArg = i+1;
dispPtr = winPtr->dispPtr;
if (dispPtr->commTkwin == NULL) {
SendInit(interp, winPtr->dispPtr);
}
/*
* See if the target interpreter is local. If so, execute
* the command directly without going through the X server.
* The only tricky thing is passing the result from the target
* interpreter to the invoking interpreter. Watch out: they
* could be the same!
*/
for (riPtr = registry; riPtr != NULL; riPtr = riPtr->nextPtr) {
if ((riPtr->dispPtr != dispPtr)
|| (strcmp(riPtr->name, destName) != 0)) {
continue;
}
Tcl_Preserve((ClientData) riPtr);
localInterp = riPtr->interp;
Tcl_Preserve((ClientData) localInterp);
if (firstArg == (argc-1)) {
result = Tcl_GlobalEval(localInterp, argv[firstArg]);
} else {
Tcl_DStringInit(&request);
Tcl_DStringAppend(&request, argv[firstArg], -1);
for (i = firstArg+1; i < argc; i++) {
Tcl_DStringAppend(&request, " ", 1);
Tcl_DStringAppend(&request, argv[i], -1);
}
result = Tcl_GlobalEval(localInterp, Tcl_DStringValue(&request));
Tcl_DStringFree(&request);
}
if (interp != localInterp) {
if (result == TCL_ERROR) {
/*
* An error occurred, so transfer error information from the
* destination interpreter back to our interpreter. Must clear
* interp's result before calling Tcl_AddErrorInfo, since
* Tcl_AddErrorInfo will store the interp's result in errorInfo
* before appending riPtr's $errorInfo; we've already got
* everything we need in riPtr's $errorInfo.
*/
Tcl_ResetResult(interp);
Tcl_AddErrorInfo(interp, Tcl_GetVar2(localInterp,
"errorInfo", (char *) NULL, TCL_GLOBAL_ONLY));
Tcl_SetVar2(interp, "errorCode", (char *) NULL,
Tcl_GetVar2(localInterp, "errorCode", (char *) NULL,
TCL_GLOBAL_ONLY), TCL_GLOBAL_ONLY);
}
if (localInterp->freeProc != TCL_STATIC) {
interp->result = localInterp->result;
interp->freeProc = localInterp->freeProc;
localInterp->freeProc = TCL_STATIC;
} else {
Tcl_SetResult(interp, localInterp->result, TCL_VOLATILE);
}
Tcl_ResetResult(localInterp);
}
Tcl_Release((ClientData) riPtr);
Tcl_Release((ClientData) localInterp);
return result;
}
/*
* Bind the interpreter name to a communication window.
*/
regPtr = RegOpen(interp, winPtr->dispPtr, 0);
commWindow = RegFindName(regPtr, destName);
RegClose(regPtr);
if (commWindow == None) {
Tcl_AppendResult(interp, "no application named \"",
destName, "\"", (char *) NULL);
return TCL_ERROR;
}
/*
* Send the command to the target interpreter by appending it to the
* comm window in the communication window.
*/
tkSendSerial++;
Tcl_DStringInit(&request);
Tcl_DStringAppend(&request, "\0c\0-n ", 6);
Tcl_DStringAppend(&request, destName, -1);
if (!async) {
sprintf(buffer, "%x %d",
(unsigned int) Tk_WindowId(dispPtr->commTkwin),
tkSendSerial);
Tcl_DStringAppend(&request, "\0-r ", 4);
Tcl_DStringAppend(&request, buffer, -1);
}
Tcl_DStringAppend(&request, "\0-s ", 4);
Tcl_DStringAppend(&request, argv[firstArg], -1);
for (i = firstArg+1; i < argc; i++) {
Tcl_DStringAppend(&request, " ", 1);
Tcl_DStringAppend(&request, argv[i], -1);
}
(void) AppendPropCarefully(dispPtr->display, commWindow,
dispPtr->commProperty, Tcl_DStringValue(&request),
Tcl_DStringLength(&request) + 1,
(async) ? (PendingCommand *) NULL : &pending);
Tcl_DStringFree(&request);
if (async) {
/*
* This is an asynchronous send: return immediately without
* waiting for a response.
*/
return TCL_OK;
}
/*
* Register the fact that we're waiting for a command to complete
* (this is needed by SendEventProc and by AppendErrorProc to pass
* back the command's results). Set up a timeout handler so that
* we can check during long sends to make sure that the destination
* application is still alive.
*/
pending.serial = tkSendSerial;
pending.dispPtr = dispPtr;
pending.target = destName;
pending.commWindow = commWindow;
pending.interp = interp;
pending.result = NULL;
pending.errorInfo = NULL;
pending.errorCode = NULL;
pending.gotResponse = 0;
pending.nextPtr = pendingCommands;
pendingCommands = &pending;
/*
* Enter a loop processing X events until the result comes
* in or the target is declared to be dead. While waiting
* for a result, look only at send-related events so that
* the send is synchronous with respect to other events in
* the application.
*/
prevRestrictProc = Tk_RestrictEvents(SendRestrictProc,
(ClientData) NULL, &prevArg);
Tcl_CreateModalTimeout(1000, TimeoutProc, (ClientData) &pending);
while (!pending.gotResponse) {
Tcl_DoOneEvent(TCL_WINDOW_EVENTS);
}
Tcl_DeleteModalTimeout(TimeoutProc, (ClientData) &pending);
(void) Tk_RestrictEvents(prevRestrictProc, prevArg, &prevArg);
/*
* Unregister the information about the pending command
* and return the result.
*/
if (pendingCommands == &pending) {
pendingCommands = pending.nextPtr;
} else {
PendingCommand *pcPtr;
for (pcPtr = pendingCommands; pcPtr != NULL;
pcPtr = pcPtr->nextPtr) {
if (pcPtr->nextPtr == &pending) {
pcPtr->nextPtr = pending.nextPtr;
break;
}
}
}
if (pending.errorInfo != NULL) {
/*
* Special trick: must clear the interp's result before calling
* Tcl_AddErrorInfo, since Tcl_AddErrorInfo will store the interp's
* result in errorInfo before appending pending.errorInfo; we've
* already got everything we need in pending.errorInfo.
*/
Tcl_ResetResult(interp);
Tcl_AddErrorInfo(interp, pending.errorInfo);
ckfree(pending.errorInfo);
}
if (pending.errorCode != NULL) {
Tcl_SetVar2(interp, "errorCode", (char *) NULL, pending.errorCode,
TCL_GLOBAL_ONLY);
ckfree(pending.errorCode);
}
Tcl_SetResult(interp, pending.result, TCL_DYNAMIC);
return pending.code;
}
/*
*----------------------------------------------------------------------
*
* TkGetInterpNames --
*
* This procedure is invoked to fetch a list of all the
* interpreter names currently registered for the display
* of a particular window.
*
* Results:
* A standard Tcl return value. Interp->result will be set
* to hold a list of all the interpreter names defined for
* tkwin's display. If an error occurs, then TCL_ERROR
* is returned and interp->result will hold an error message.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
int
TkGetInterpNames(interp, tkwin)
Tcl_Interp *interp; /* Interpreter for returning a result. */
Tk_Window tkwin; /* Window whose display is to be used
* for the lookup. */
{
TkWindow *winPtr = (TkWindow *) tkwin;
char *p, *entry, *entryName;
NameRegistry *regPtr;
Window commWindow;
int count;
/*
* Read the registry property, then scan through all of its entries.
* Validate each entry to be sure that its application still exists.
*/
regPtr = RegOpen(interp, winPtr->dispPtr, 1);
for (p = regPtr->property; (p-regPtr->property) < regPtr->propLength; ) {
entry = p;
if (sscanf(p, "%x",(unsigned int *) &commWindow) != 1) {
commWindow = None;
}
while ((*p != 0) && (!isspace(UCHAR(*p)))) {
p++;
}
if (*p != 0) {
p++;
}
entryName = p;
while (*p != 0) {
p++;
}
p++;
if (ValidateName(winPtr->dispPtr, entryName, commWindow, 1)) {
/*
* The application still exists; add its name to the result.
*/
Tcl_AppendElement(interp, entryName);
} else {
/*
* This name is bogus (perhaps the application died without
* cleaning up its entry in the registry?). Delete the name.
*/
count = regPtr->propLength - (p - regPtr->property);
if (count > 0) {
memmove((VOID *) entry, (VOID *) p, (size_t) count);
}
regPtr->propLength -= p - entry;
regPtr->modified = 1;
p = entry;
}
}
RegClose(regPtr);
return TCL_OK;
}
/*
*--------------------------------------------------------------
*
* SendInit --
*
* This procedure is called to initialize the
* communication channels for sending commands and
* receiving results.
*
* Results:
* None.
*
* Side effects:
* Sets up various data structures and windows.
*
*--------------------------------------------------------------
*/
static int
SendInit(interp, dispPtr)
Tcl_Interp *interp; /* Interpreter to use for error reporting
* (no errors are ever returned, but the
* interpreter is needed anyway). */
TkDisplay *dispPtr; /* Display to initialize. */
{
XSetWindowAttributes atts;
/*
* Create the window used for communication, and set up an
* event handler for it.
*/
dispPtr->commTkwin = Tk_CreateWindow(interp, (Tk_Window) NULL,
"_comm", DisplayString(dispPtr->display));
if (dispPtr->commTkwin == NULL) {
panic("Tk_CreateWindow failed in SendInit!");
}
atts.override_redirect = True;
Tk_ChangeWindowAttributes(dispPtr->commTkwin,
CWOverrideRedirect, &atts);
Tk_CreateEventHandler(dispPtr->commTkwin, PropertyChangeMask,
SendEventProc, (ClientData) dispPtr);
Tk_MakeWindowExist(dispPtr->commTkwin);
/*
* Get atoms used as property names.
*/
dispPtr->commProperty = Tk_InternAtom(dispPtr->commTkwin, "Comm");
dispPtr->registryProperty = Tk_InternAtom(dispPtr->commTkwin,
"InterpRegistry");
dispPtr->appNameProperty = Tk_InternAtom(dispPtr->commTkwin,
"TK_APPLICATION");
return TCL_OK;
}
/*
*--------------------------------------------------------------
*
* SendEventProc --
*
* This procedure is invoked automatically by the toolkit
* event manager when a property changes on the communication
* window. This procedure reads the property and handles
* command requests and responses.
*
* Results:
* None.
*
* Side effects:
* If there are command requests in the property, they
* are executed. If there are responses in the property,
* their information is saved for the (ostensibly waiting)
* "send" commands. The property is deleted.
*
*--------------------------------------------------------------
*/
static void
SendEventProc(clientData, eventPtr)
ClientData clientData; /* Display information. */
XEvent *eventPtr; /* Information about event. */
{
TkDisplay *dispPtr = (TkDisplay *) clientData;
char *propInfo;
register char *p;
int result, actualFormat;
unsigned long numItems, bytesAfter;
Atom actualType;
Tcl_Interp *remoteInterp; /* Interp in which to execute the command. */
if ((eventPtr->xproperty.atom != dispPtr->commProperty)
|| (eventPtr->xproperty.state != PropertyNewValue)) {
return;
}
/*
* Read the comm property and delete it.
*/
propInfo = NULL;
result = XGetWindowProperty(dispPtr->display,
Tk_WindowId(dispPtr->commTkwin),
dispPtr->commProperty, 0, MAX_PROP_WORDS, True,
XA_STRING, &actualType, &actualFormat,
&numItems, &bytesAfter, (unsigned char **) &propInfo);
/*
* If the property doesn't exist or is improperly formed
* then ignore it.
*/
if ((result != Success) || (actualType != XA_STRING)
|| (actualFormat != 8)) {
if (propInfo != NULL) {
XFree(propInfo);
}
return;
}
/*
* Several commands and results could arrive in the property at
* one time; each iteration through the outer loop handles a
* single command or result.
*/
for (p = propInfo; (p-propInfo) < numItems; ) {
/*
* Ignore leading NULLs; each command or result starts with a
* NULL so that no matter how badly formed a preceding command
* is, we'll be able to tell that a new command/result is
* starting.
*/
if (*p == 0) {
p++;
continue;
}
if ((*p == 'c') && (p[1] == 0)) {
Window commWindow;
char *interpName, *script, *serial, *end;
Tcl_DString reply;
RegisteredInterp *riPtr;
/*
*----------------------------------------------------------
* This is an incoming command from some other application.
* Iterate over all of its options. Stop when we reach
* the end of the property or something that doesn't look
* like an option.
*----------------------------------------------------------
*/
p += 2;
interpName = NULL;
commWindow = None;
serial = "";
script = NULL;
while (((p-propInfo) < numItems) && (*p == '-')) {
switch (p[1]) {
case 'r':
commWindow = (Window) strtoul(p+2, &end, 16);
if ((end == p+2) || (*end != ' ')) {
commWindow = None;
} else {
p = serial = end+1;
}
break;
case 'n':
if (p[2] == ' ') {
interpName = p+3;
}
break;
case 's':
if (p[2] == ' ') {
script = p+3;
}
break;
}
while (*p != 0) {
p++;
}
p++;
}
if ((script == NULL) || (interpName == NULL)) {
continue;
}
/*
* Initialize the result property, so that we're ready at any
* time if we need to return an error.
*/
if (commWindow != None) {
Tcl_DStringInit(&reply);
Tcl_DStringAppend(&reply, "\0r\0-s ", 6);
Tcl_DStringAppend(&reply, serial, -1);
Tcl_DStringAppend(&reply, "\0-r ", 4);
}
if (!ServerSecure(dispPtr)) {
if (commWindow != None) {
Tcl_DStringAppend(&reply, "X server insecure (must use xauth-style authorization); command ignored", -1);
}
result = TCL_ERROR;
goto returnResult;
}
/*
* Locate the application, then execute the script.
*/
for (riPtr = registry; ; riPtr = riPtr->nextPtr) {
if (riPtr == NULL) {
if (commWindow != None) {
Tcl_DStringAppend(&reply,
"receiver never heard of interpreter \"", -1);
Tcl_DStringAppend(&reply, interpName, -1);
Tcl_DStringAppend(&reply, "\"", 1);
}
result = TCL_ERROR;
goto returnResult;
}
if (strcmp(riPtr->name, interpName) == 0) {
break;
}
}
Tcl_Preserve((ClientData) riPtr);
/*
* We must protect the interpreter because the script may
* enter another event loop, which might call Tcl_DeleteInterp.
*/
remoteInterp = riPtr->interp;
Tcl_Preserve((ClientData) remoteInterp);
result = Tcl_GlobalEval(remoteInterp, script);
/*
* The call to Tcl_Release may have released the interpreter
* which will cause the "send" command for that interpreter
* to be deleted. The command deletion callback will set the
* riPtr->interp field to NULL, hence the check below for NULL.
*/
if (commWindow != None) {
Tcl_DStringAppend(&reply, remoteInterp->result, -1);
if (result == TCL_ERROR) {
char *varValue;
varValue = Tcl_GetVar2(remoteInterp, "errorInfo",
(char *) NULL, TCL_GLOBAL_ONLY);
if (varValue != NULL) {
Tcl_DStringAppend(&reply, "\0-i ", 4);
Tcl_DStringAppend(&reply, varValue, -1);
}
varValue = Tcl_GetVar2(remoteInterp, "errorCode",
(char *) NULL, TCL_GLOBAL_ONLY);
if (varValue != NULL) {
Tcl_DStringAppend(&reply, "\0-e ", 4);
Tcl_DStringAppend(&reply, varValue, -1);
}
}
}
Tcl_Release((ClientData) remoteInterp);
Tcl_Release((ClientData) riPtr);
/*
* Return the result to the sender if a commWindow was
* specified (if none was specified then this is an asynchronous
* call). Right now reply has everything but the completion
* code, but it needs the NULL to terminate the current option.
*/
returnResult:
if (commWindow != None) {
if (result != TCL_OK) {
char buffer[20];
sprintf(buffer, "%d", result);
Tcl_DStringAppend(&reply, "\0-c ", 4);
Tcl_DStringAppend(&reply, buffer, -1);
}
(void) AppendPropCarefully(dispPtr->display, commWindow,
dispPtr->commProperty, Tcl_DStringValue(&reply),
Tcl_DStringLength(&reply) + 1,
(PendingCommand *) NULL);
XFlush(dispPtr->display);
Tcl_DStringFree(&reply);
}
} else if ((*p == 'r') && (p[1] == 0)) {
int serial, code, gotSerial;
char *errorInfo, *errorCode, *resultString;
PendingCommand *pcPtr;
/*
*----------------------------------------------------------
* This is a reply to some command that we sent out. Iterate
* over all of its options. Stop when we reach the end of the
* property or something that doesn't look like an option.
*----------------------------------------------------------
*/
p += 2;
code = TCL_OK;
gotSerial = 0;
errorInfo = NULL;
errorCode = NULL;
resultString = "";
while (((p-propInfo) < numItems) && (*p == '-')) {
switch (p[1]) {
case 'c':
if (sscanf(p+2, " %d", &code) != 1) {
code = TCL_OK;
}
break;
case 'e':
if (p[2] == ' ') {
errorCode = p+3;
}
break;
case 'i':
if (p[2] == ' ') {
errorInfo = p+3;
}
break;
case 'r':
if (p[2] == ' ') {
resultString = p+3;
}
break;
case 's':
if (sscanf(p+2, " %d", &serial) == 1) {
gotSerial = 1;
}
break;
}
while (*p != 0) {
p++;
}
p++;
}
if (!gotSerial) {
continue;
}
/*
* Give the result information to anyone who's
* waiting for it.
*/
for (pcPtr = pendingCommands; pcPtr != NULL;
pcPtr = pcPtr->nextPtr) {
if ((serial != pcPtr->serial) || (pcPtr->result != NULL)) {
continue;
}
pcPtr->code = code;
if (resultString != NULL) {
pcPtr->result = (char *) ckalloc((unsigned)
(strlen(resultString) + 1));
strcpy(pcPtr->result, resultString);
}
if (code == TCL_ERROR) {
if (errorInfo != NULL) {
pcPtr->errorInfo = (char *) ckalloc((unsigned)
(strlen(errorInfo) + 1));
strcpy(pcPtr->errorInfo, errorInfo);
}
if (errorCode != NULL) {
pcPtr->errorCode = (char *) ckalloc((unsigned)
(strlen(errorCode) + 1));
strcpy(pcPtr->errorCode, errorCode);
}
}
pcPtr->gotResponse = 1;
break;
}
} else {
/*
* Didn't recognize this thing. Just skip through the next
* null character and try again.
*/
while (*p != 0) {
p++;
}
p++;
}
}
XFree(propInfo);
}
/*
*--------------------------------------------------------------
*
* AppendPropCarefully --
*
* Append a given property to a given window, but set up
* an X error handler so that if the append fails this
* procedure can return an error code rather than having
* Xlib panic.
*
* Results:
* None.
*
* Side effects:
* The given property on the given window is appended to.
* If this operation fails and if pendingPtr is non-NULL,
* then the pending operation is marked as complete with
* an error.
*
*--------------------------------------------------------------
*/
static void
AppendPropCarefully(display, window, property, value, length, pendingPtr)
Display *display; /* Display on which to operate. */
Window window; /* Window whose property is to
* be modified. */
Atom property; /* Name of property. */
char *value; /* Characters to append to property. */
int length; /* Number of bytes to append. */
PendingCommand *pendingPtr; /* Pending command to mark complete
* if an error occurs during the
* property op. NULL means just
* ignore the error. */
{
Tk_ErrorHandler handler;
handler = Tk_CreateErrorHandler(display, -1, -1, -1, AppendErrorProc,
(ClientData) pendingPtr);
XChangeProperty(display, window, property, XA_STRING, 8,
PropModeAppend, (unsigned char *) value, length);
Tk_DeleteErrorHandler(handler);
}
/*
* The procedure below is invoked if an error occurs during
* the XChangeProperty operation above.
*/
/* ARGSUSED */
static int
AppendErrorProc(clientData, errorPtr)
ClientData clientData; /* Command to mark complete, or NULL. */
XErrorEvent *errorPtr; /* Information about error. */
{
PendingCommand *pendingPtr = (PendingCommand *) clientData;
register PendingCommand *pcPtr;
if (pendingPtr == NULL) {
return 0;
}
/*
* Make sure this command is still pending.
*/
for (pcPtr = pendingCommands; pcPtr != NULL;
pcPtr = pcPtr->nextPtr) {
if ((pcPtr == pendingPtr) && (pcPtr->result == NULL)) {
pcPtr->result = (char *) ckalloc((unsigned)
(strlen(pcPtr->target) + 50));
sprintf(pcPtr->result, "no application named \"%s\"",
pcPtr->target);
pcPtr->code = TCL_ERROR;
pcPtr->gotResponse = 1;
break;
}
}
return 0;
}
/*
*--------------------------------------------------------------
*
* TimeoutProc --
*
* This procedure is invoked when an unusually long amout of
* time has elapsed during the processing of a sent command.
* It checks to make sure that the target application still
* exists, and reschedules itself to check again later.
*
* Results:
* None.
*
* Side effects:
* If the target application has gone away abort the send
* operation with an error.
*
*--------------------------------------------------------------
*/
static void
TimeoutProc(clientData)
ClientData clientData; /* Information about command that
* has been sent but not yet
* responded to. */
{
PendingCommand *pcPtr = (PendingCommand *) clientData;
register PendingCommand *pcPtr2;
/*
* Make sure that the command is still in the pending list
* and that it hasn't already completed. Then validate the
* existence of the target application.
*/
for (pcPtr2 = pendingCommands; pcPtr2 != NULL;
pcPtr2 = pcPtr2->nextPtr) {
char *msg;
if ((pcPtr2 != pcPtr) || (pcPtr2->result != NULL)) {
continue;
}
if (!ValidateName(pcPtr2->dispPtr, pcPtr2->target,
pcPtr2->commWindow, 0)) {
if (ValidateName(pcPtr2->dispPtr, pcPtr2->target,
pcPtr2->commWindow, 1)) {
msg =
"target application died or uses a Tk version before 4.0";
} else {
msg = "target application died";
}
pcPtr2->code = TCL_ERROR;
pcPtr2->result = (char *) ckalloc((unsigned) (strlen(msg) + 1));
strcpy(pcPtr2->result, msg);
pcPtr2->gotResponse = 1;
} else {
Tcl_DeleteModalTimeout(TimeoutProc, clientData);
Tcl_CreateModalTimeout(2000, TimeoutProc, clientData);
}
}
}
/*
*--------------------------------------------------------------
*
* DeleteProc --
*
* This procedure is invoked by Tcl when the "send" command
* is deleted in an interpreter. It unregisters the interpreter.
*
* Results:
* None.
*
* Side effects:
* The interpreter given by riPtr is unregistered.
*
*--------------------------------------------------------------
*/
static void
DeleteProc(clientData)
ClientData clientData; /* Info about registration, passed
* as ClientData. */
{
RegisteredInterp *riPtr = (RegisteredInterp *) clientData;
register RegisteredInterp *riPtr2;
NameRegistry *regPtr;
regPtr = RegOpen(riPtr->interp, riPtr->dispPtr, 1);
RegDeleteName(regPtr, riPtr->name);
RegClose(regPtr);
if (registry == riPtr) {
registry = riPtr->nextPtr;
} else {
for (riPtr2 = registry; riPtr2 != NULL;
riPtr2 = riPtr2->nextPtr) {
if (riPtr2->nextPtr == riPtr) {
riPtr2->nextPtr = riPtr->nextPtr;
break;
}
}
}
ckfree((char *) riPtr->name);
riPtr->interp = NULL;
UpdateCommWindow(riPtr->dispPtr);
Tcl_EventuallyFree((ClientData) riPtr, TCL_DYNAMIC);
}
/*
*----------------------------------------------------------------------
*
* SendRestrictProc --
*
* This procedure filters incoming events when a "send" command
* is outstanding. It defers all events except those containing
* send commands and results.
*
* Results:
* False is returned except for property-change events on a
* commWindow.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
/* ARGSUSED */
static Tk_RestrictAction
SendRestrictProc(clientData, eventPtr)
ClientData clientData; /* Not used. */
register XEvent *eventPtr; /* Event that just arrived. */
{
TkDisplay *dispPtr;
if (eventPtr->type != PropertyNotify) {
return TK_DEFER_EVENT;
}
for (dispPtr = tkDisplayList; dispPtr != NULL; dispPtr = dispPtr->nextPtr) {
if ((eventPtr->xany.display == dispPtr->display)
&& (eventPtr->xproperty.window
== Tk_WindowId(dispPtr->commTkwin))) {
return TK_PROCESS_EVENT;
}
}
return TK_DEFER_EVENT;
}
/*
*----------------------------------------------------------------------
*
* UpdateCommWindow --
*
* This procedure updates the list of application names stored
* on our commWindow. It is typically called when interpreters
* are registered and unregistered.
*
* Results:
* None.
*
* Side effects:
* The TK_APPLICATION property on the comm window is updated.
*
*----------------------------------------------------------------------
*/
static void
UpdateCommWindow(dispPtr)
TkDisplay *dispPtr; /* Display whose commWindow is to be
* updated. */
{
Tcl_DString names;
RegisteredInterp *riPtr;
Tcl_DStringInit(&names);
for (riPtr = registry; riPtr != NULL; riPtr = riPtr->nextPtr) {
Tcl_DStringAppendElement(&names, riPtr->name);
}
XChangeProperty(dispPtr->display, Tk_WindowId(dispPtr->commTkwin),
dispPtr->appNameProperty, XA_STRING, 8, PropModeReplace,
(unsigned char *) Tcl_DStringValue(&names),
Tcl_DStringLength(&names));
Tcl_DStringFree(&names);
}
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