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- /*
- * 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 1.63 96/03/29 12:37:13
- */
-
- #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,
- ®Ptr->propLength, &bytesAfter,
- (unsigned char **) ®Ptr->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],
- #ifdef STk_CODE
- "\": must be :async, :displayof, or :-", (char *) NULL);
- #else
- "\": must be -async, -displayof, or --", (char *) NULL);
- #endif
- 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);
- #ifdef STk_CODE
- Tcl_AddErrorInfo(interp, Tcl_GetVar2(localInterp,
- "*error-info*", (char *) NULL, TCL_GLOBAL_ONLY));
- Tcl_SetVar(interp, "*error-code*",
- Tcl_GetVar(localInterp, "*error-code*",TCL_GLOBAL_ONLY),
- STk_STRINGIFY | TCL_GLOBAL_ONLY);
- #else
- 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);
- #endif
- }
- 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) dispPtr->commTkwin, &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) {
- #ifdef STk_CODE
- Tcl_SetVar(interp, "*error-code*", pending.errorCode,
- STk_STRINGIFY |
-
- #else
- Tcl_SetVar2(interp, "errorCode", (char *) NULL, pending.errorCode,
- #endif
- 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);
- #ifdef STk_CODE
- Tcl_AppendElement(interp, "(");
- #endif
- 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.
- */
-
- #ifdef STk_CODE
- Tcl_AppendElement(interp, (char*) STk_stringify(entryName, 0));
- #else
- Tcl_AppendElement(interp, entryName);
- #endif
- } 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;
- }
- }
- #ifdef STk_CODE
- Tcl_AppendElement(interp, ")");
- #endif
- 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;
-
- #ifdef STk_CODE
- varValue = Tcl_GetVar(remoteInterp, "*error-info*",
- TCL_GLOBAL_ONLY);
- #else
- varValue = Tcl_GetVar2(remoteInterp, "errorInfo",
- (char *) NULL, TCL_GLOBAL_ONLY);
- #endif
- if (varValue != NULL) {
- Tcl_DStringAppend(&reply, "\0-i ", 4);
- Tcl_DStringAppend(&reply, varValue, -1);
- }
- #ifdef STk_CODE
- varValue = Tcl_GetVar(remoteInterp, "*error-code*",
- TCL_GLOBAL_ONLY);
- #else
- varValue = Tcl_GetVar2(remoteInterp, "errorCode",
- (char *) NULL, TCL_GLOBAL_ONLY);
- #endif
- 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 the
- * given commWindow.
- *
- * Side effects:
- * None.
- *
- *----------------------------------------------------------------------
- */
-
- /* ARGSUSED */
- static Tk_RestrictAction
- SendRestrictProc(arg, eventPtr)
- ClientData arg; /* Comunication window in which
- * we're interested. */
- register XEvent *eventPtr; /* Event that just arrived. */
- {
- register Tk_Window comm = (Tk_Window) arg;
-
- if ((eventPtr->xany.display != Tk_Display(comm))
- || (eventPtr->type != PropertyNotify)
- || (eventPtr->xproperty.window != Tk_WindowId(comm))) {
- return TK_DEFER_EVENT;
- }
- return TK_PROCESS_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);
- }
-