tclInterp.c Go to the documentation of this file. /* * tclInterp.c -- * * This file implements the "interp" command which allows creation and * manipulation of Tcl interpreters from within Tcl scripts. * * Copyright (c) 1995-1997 Sun Microsystems, Inc. * Copyright (c) 2004 Donal K. Fellows * * See the file "license.terms" for information on usage and redistribution * of this file, and for a DISCLAIMER OF ALL WARRANTIES. * * RCS: @(#) $Id: tclInterp.c,v 1.83 2008/01/30 10:45:55 msofer Exp $ */ #include "tclInt.h" /* * A pointer to a string that holds an initialization script that if non-NULL * is evaluated in Tcl_Init() prior to the built-in initialization script * above. This variable can be modified by the function below. */ static char *tclPreInitScript = NULL;  /* Forward declaration */ struct Target; /* * struct Alias: * * Stores information about an alias. Is stored in the slave interpreter and * used by the source command to find the target command in the master when * the source command is invoked. */ typedef struct Alias { Tcl_Obj *token; /* Token for the alias command in the slave * interp. This used to be the command name in * the slave when the alias was first * created. */ Tcl_Interp *targetInterp; /* Interp in which target command will be * invoked. */ Tcl_Command slaveCmd; /* Source command in slave interpreter, bound * to command that invokes the target command * in the target interpreter. */ Tcl_HashEntry *aliasEntryPtr; /* Entry for the alias hash table in slave. * This is used by alias deletion to remove * the alias from the slave interpreter alias * table. */ struct Target *targetPtr; /* Entry for target command in master. This is * used in the master interpreter to map back * from the target command to aliases * redirecting to it. */ int objc; /* Count of Tcl_Obj in the prefix of the * target command to be invoked in the target * interpreter. Additional arguments specified * when calling the alias in the slave interp * will be appended to the prefix before the * command is invoked. */ Tcl_Obj *objPtr; /* The first actual prefix object - the target * command name; this has to be at the end of * the structure, which will be extended to * accomodate the remaining objects in the * prefix. */ } Alias; /* * * struct Slave: * * Used by the "interp" command to record and find information about slave * interpreters. Maps from a command name in the master to information about a * slave interpreter, e.g. what aliases are defined in it. */ typedef struct Slave { Tcl_Interp *masterInterp; /* Master interpreter for this slave. */ Tcl_HashEntry *slaveEntryPtr; /* Hash entry in masters slave table for this * slave interpreter. Used to find this * record, and used when deleting the slave * interpreter to delete it from the master's * table. */ Tcl_Interp *slaveInterp; /* The slave interpreter. */ Tcl_Command interpCmd; /* Interpreter object command. */ Tcl_HashTable aliasTable; /* Table which maps from names of commands in * slave interpreter to struct Alias defined * below. */ } Slave; /* * struct Target: * * Maps from master interpreter commands back to the source commands in slave * interpreters. This is needed because aliases can be created between sibling * interpreters and must be deleted when the target interpreter is deleted. In * case they would not be deleted the source interpreter would be left with a * "dangling pointer". One such record is stored in the Master record of the * master interpreter with the master for each alias which directs to a * command in the master. These records are used to remove the source command * for an from a slave if/when the master is deleted. They are organized in a * doubly-linked list attached to the master interpreter. */ typedef struct Target { Tcl_Command slaveCmd; /* Command for alias in slave interp. */ Tcl_Interp *slaveInterp; /* Slave Interpreter. */ struct Target *nextPtr; /* Next in list of target records, or NULL if * at the end of the list of targets. */ struct Target *prevPtr; /* Previous in list of target records, or NULL * if at the start of the list of targets. */ } Target; /* * struct Master: * * This record is used for two purposes: First, slaveTable (a hashtable) maps * from names of commands to slave interpreters. This hashtable is used to * store information about slave interpreters of this interpreter, to map over * all slaves, etc. The second purpose is to store information about all * aliases in slaves (or siblings) which direct to target commands in this * interpreter (using the targetsPtr doubly-linked list). * * NB: the flags field in the interp structure, used with SAFE_INTERP mask * denotes whether the interpreter is safe or not. Safe interpreters have * restricted functionality, can only create safe slave interpreters and can * only load safe extensions. */ typedef struct Master { Tcl_HashTable slaveTable; /* Hash table for slave interpreters. Maps * from command names to Slave records. */ Target *targetsPtr; /* The head of a doubly-linked list of all the * target records which denote aliases from * slaves or sibling interpreters that direct * to commands in this interpreter. This list * is used to remove dangling pointers from * the slave (or sibling) interpreters when * this interpreter is deleted. */ } Master; /* * The following structure keeps track of all the Master and Slave information * on a per-interp basis. */ typedef struct InterpInfo { Master master; /* Keeps track of all interps for which this * interp is the Master. */ Slave slave; /* Information necessary for this interp to * function as a slave. */ } InterpInfo; /* * Limit callbacks handled by scripts are modelled as structures which are * stored in hashes indexed by a two-word key. Note that the type of the * 'type' field in the key is not int; this is to make sure that things are * likely to work properly on 64-bit architectures. */ typedef struct ScriptLimitCallback { Tcl_Interp *interp; /* The interpreter in which to execute the * callback. */ Tcl_Obj *scriptObj; /* The script to execute to perform the * user-defined part of the callback. */ int type; /* What kind of callback is this. */ Tcl_HashEntry *entryPtr; /* The entry in the hash table maintained by * the target interpreter that refers to this * callback record, or NULL if the entry has * already been deleted from that hash * table. */ } ScriptLimitCallback; typedef struct ScriptLimitCallbackKey { Tcl_Interp *interp; /* The interpreter that the limit callback was * attached to. This is not the interpreter * that the callback runs in! */ long type; /* The type of callback that this is. */ } ScriptLimitCallbackKey; /* * Prototypes for local static functions: */ static int AliasCreate(Tcl_Interp *interp, Tcl_Interp *slaveInterp, Tcl_Interp *masterInterp, Tcl_Obj *namePtr, Tcl_Obj *targetPtr, int objc, Tcl_Obj *const objv[]); static int AliasDelete(Tcl_Interp *interp, Tcl_Interp *slaveInterp, Tcl_Obj *namePtr); static int AliasDescribe(Tcl_Interp *interp, Tcl_Interp *slaveInterp, Tcl_Obj *objPtr); static int AliasList(Tcl_Interp *interp, Tcl_Interp *slaveInterp); static int AliasObjCmd(ClientData dummy, Tcl_Interp *currentInterp, int objc, Tcl_Obj *const objv[]); static void AliasObjCmdDeleteProc(ClientData clientData); static Tcl_Interp * GetInterp(Tcl_Interp *interp, Tcl_Obj *pathPtr); static Tcl_Interp * GetInterp2(Tcl_Interp *interp, int objc, Tcl_Obj *const objv[]); static void InterpInfoDeleteProc(ClientData clientData, Tcl_Interp *interp); static int SlaveBgerror(Tcl_Interp *interp, Tcl_Interp *slaveInterp, int objc, Tcl_Obj *const objv[]); static Tcl_Interp * SlaveCreate(Tcl_Interp *interp, Tcl_Obj *pathPtr, int safe); static int SlaveEval(Tcl_Interp *interp, Tcl_Interp *slaveInterp, int objc, Tcl_Obj *const objv[]); static int SlaveExpose(Tcl_Interp *interp, Tcl_Interp *slaveInterp, int objc, Tcl_Obj *const objv[]); static int SlaveHide(Tcl_Interp *interp, Tcl_Interp *slaveInterp, int objc, Tcl_Obj *const objv[]); static int SlaveHidden(Tcl_Interp *interp, Tcl_Interp *slaveInterp); static int SlaveInvokeHidden(Tcl_Interp *interp, Tcl_Interp *slaveInterp, const char *namespaceName, int objc, Tcl_Obj *const objv[]); static int SlaveMarkTrusted(Tcl_Interp *interp, Tcl_Interp *slaveInterp); static int SlaveObjCmd(ClientData dummy, Tcl_Interp *interp, int objc, Tcl_Obj *const objv[]); static void SlaveObjCmdDeleteProc(ClientData clientData); static int SlaveRecursionLimit(Tcl_Interp *interp, Tcl_Interp *slaveInterp, int objc, Tcl_Obj *const objv[]); static int SlaveCommandLimitCmd(Tcl_Interp *interp, Tcl_Interp *slaveInterp, int consumedObjc, int objc, Tcl_Obj *const objv[]); static int SlaveTimeLimitCmd(Tcl_Interp *interp, Tcl_Interp *slaveInterp, int consumedObjc, int objc, Tcl_Obj *const objv[]); static void InheritLimitsFromMaster(Tcl_Interp *slaveInterp, Tcl_Interp *masterInterp); static void SetScriptLimitCallback(Tcl_Interp *interp, int type, Tcl_Interp *targetInterp, Tcl_Obj *scriptObj); static void CallScriptLimitCallback(ClientData clientData, Tcl_Interp *interp); static void DeleteScriptLimitCallback(ClientData clientData); static void RunLimitHandlers(LimitHandler *handlerPtr, Tcl_Interp *interp); static void TimeLimitCallback(ClientData clientData);  /* *---------------------------------------------------------------------- * * TclSetPreInitScript -- * * This routine is used to change the value of the internal variable, * tclPreInitScript. * * Results: * Returns the current value of tclPreInitScript. * * Side effects: * Changes the way Tcl_Init() routine behaves. * *---------------------------------------------------------------------- */ char * TclSetPreInitScript( char *string) /* Pointer to a script. */ { char *prevString = tclPreInitScript; tclPreInitScript = string; return(prevString); }  /* *---------------------------------------------------------------------- * * Tcl_Init -- * * This function is typically invoked by Tcl_AppInit functions to find * and source the "init.tcl" script, which should exist somewhere on the * Tcl library path. * * Results: * Returns a standard Tcl completion code and sets the interp's result if * there is an error. * * Side effects: * Depends on what's in the init.tcl script. * *---------------------------------------------------------------------- */ int Tcl_Init( Tcl_Interp *interp) /* Interpreter to initialize. */ { if (tclPreInitScript != NULL) { if (Tcl_Eval(interp, tclPreInitScript) == TCL_ERROR) { return (TCL_ERROR); }; } /* * In order to find init.tcl during initialization, the following script * is invoked by Tcl_Init(). It looks in several different directories: * * $tcl_library - can specify a primary location, if set, no * other locations will be checked. This is the * recommended way for a program that embeds * Tcl to specifically tell Tcl where to find * an init.tcl file. * * $env(TCL_LIBRARY) - highest priority so user can always override * the search path unless the application has * specified an exact directory above * * $tclDefaultLibrary - INTERNAL: This variable is set by Tcl on * those platforms where it can determine at * runtime the directory where it expects the * init.tcl file to be. After [tclInit] reads * and uses this value, it [unset]s it. * External users of Tcl should not make use of * the variable to customize [tclInit]. * * $tcl_libPath - OBSOLETE: This variable is no longer set by * Tcl itself, but [tclInit] examines it in * case some program that embeds Tcl is * customizing [tclInit] by setting this * variable to a list of directories in which * to search. * * [tcl::pkgconfig get scriptdir,runtime] * - the directory determined by configure to be * the place where Tcl's script library is to * be installed. * * The first directory on this path that contains a valid init.tcl script * will be set as the value of tcl_library. * * Note that this entire search mechanism can be bypassed by defining an * alternate tclInit command before calling Tcl_Init(). */ return Tcl_Eval(interp, "if {[namespace which -command tclInit] eq \"\"} {\n" " proc tclInit {} {\n" " global tcl_libPath tcl_library env tclDefaultLibrary\n" " rename tclInit {}\n" " if {[info exists tcl_library]} {\n" " set scripts {{set tcl_library}}\n" " } else {\n" " set scripts {}\n" " if {[info exists env(TCL_LIBRARY)] && ($env(TCL_LIBRARY) ne {})} {\n" " lappend scripts {set env(TCL_LIBRARY)}\n" " lappend scripts {\n" "if {[regexp ^tcl(.*)$ [file tail $env(TCL_LIBRARY)] -> tail] == 0} continue\n" "if {$tail eq [info tclversion]} continue\n" "file join [file dirname $env(TCL_LIBRARY)] tcl[info tclversion]}\n" " }\n" " if {[info exists tclDefaultLibrary]} {\n" " lappend scripts {set tclDefaultLibrary}\n" " } else {\n" " lappend scripts {::tcl::pkgconfig get scriptdir,runtime}\n" " }\n" " lappend scripts {\n" "set parentDir [file dirname [file dirname [info nameofexecutable]]]\n" "set grandParentDir [file dirname $parentDir]\n" "file join $parentDir lib tcl[info tclversion]} \\\n" " {file join $grandParentDir lib tcl[info tclversion]} \\\n" " {file join $parentDir library} \\\n" " {file join $grandParentDir library} \\\n" " {file join $grandParentDir tcl[info patchlevel] library} \\\n" " {\n" "file join [file dirname $grandParentDir] tcl[info patchlevel] library}\n" " if {[info exists tcl_libPath]\n" " && [catch {llength $tcl_libPath} len] == 0} {\n" " for {set i 0} {$i < $len} {incr i} {\n" " lappend scripts [list lindex \\$tcl_libPath $i]\n" " }\n" " }\n" " }\n" " set dirs {}\n" " set errors {}\n" " foreach script $scripts {\n" " lappend dirs [eval $script]\n" " set tcl_library [lindex $dirs end]\n" " set tclfile [file join $tcl_library init.tcl]\n" " if {[file exists $tclfile]} {\n" " if {[catch {uplevel #0 [list source $tclfile]} msg opts]} {\n" " append errors \"$tclfile: $msg\n\"\n" " append errors \"[dict get $opts -errorinfo]\n\"\n" " continue\n" " }\n" " unset -nocomplain tclDefaultLibrary\n" " return\n" " }\n" " }\n" " unset -nocomplain tclDefaultLibrary\n" " set msg \"Can't find a usable init.tcl in the following directories: \n\"\n" " append msg \" $dirs\n\n\"\n" " append msg \"$errors\n\n\"\n" " append msg \"This probably means that Tcl wasn't installed properly.\n\"\n" " error $msg\n" " }\n" "}\n" "tclInit"); }  /* *--------------------------------------------------------------------------- * * TclInterpInit -- * * Initializes the invoking interpreter for using the master, slave and * safe interp facilities. This is called from inside Tcl_CreateInterp(). * * Results: * Always returns TCL_OK for backwards compatibility. * * Side effects: * Adds the "interp" command to an interpreter and initializes the * interpInfoPtr field of the invoking interpreter. * *--------------------------------------------------------------------------- */ int TclInterpInit( Tcl_Interp *interp) /* Interpreter to initialize. */ { InterpInfo *interpInfoPtr; Master *masterPtr; Slave *slavePtr; interpInfoPtr = (InterpInfo *) ckalloc(sizeof(InterpInfo)); ((Interp *) interp)->interpInfo = interpInfoPtr; masterPtr = &interpInfoPtr->master; Tcl_InitHashTable(&masterPtr->slaveTable, TCL_STRING_KEYS); masterPtr->targetsPtr = NULL; slavePtr = &interpInfoPtr->slave; slavePtr->masterInterp = NULL; slavePtr->slaveEntryPtr = NULL; slavePtr->slaveInterp = interp; slavePtr->interpCmd = NULL; Tcl_InitHashTable(&slavePtr->aliasTable, TCL_STRING_KEYS); Tcl_CreateObjCommand(interp, "interp", Tcl_InterpObjCmd, NULL, NULL); Tcl_CallWhenDeleted(interp, InterpInfoDeleteProc, NULL); return TCL_OK; }  /* *--------------------------------------------------------------------------- * * InterpInfoDeleteProc -- * * Invoked when an interpreter is being deleted. It releases all storage * used by the master/slave/safe interpreter facilities. * * Results: * None. * * Side effects: * Cleans up storage. Sets the interpInfoPtr field of the interp to NULL. * *--------------------------------------------------------------------------- */ static void InterpInfoDeleteProc( ClientData clientData, /* Ignored. */ Tcl_Interp *interp) /* Interp being deleted. All commands for * slave interps should already be deleted. */ { InterpInfo *interpInfoPtr; Slave *slavePtr; Master *masterPtr; Target *targetPtr; interpInfoPtr = (InterpInfo *) ((Interp *) interp)->interpInfo; /* * There shouldn't be any commands left. */ masterPtr = &interpInfoPtr->master; if (masterPtr->slaveTable.numEntries != 0) { Tcl_Panic("InterpInfoDeleteProc: still exist commands"); } Tcl_DeleteHashTable(&masterPtr->slaveTable); /* * Tell any interps that have aliases to this interp that they should * delete those aliases. If the other interp was already dead, it would * have removed the target record already. */ for (targetPtr = masterPtr->targetsPtr; targetPtr != NULL; ) { Target *tmpPtr = targetPtr->nextPtr; Tcl_DeleteCommandFromToken(targetPtr->slaveInterp, targetPtr->slaveCmd); targetPtr = tmpPtr; } slavePtr = &interpInfoPtr->slave; if (slavePtr->interpCmd != NULL) { /* * Tcl_DeleteInterp() was called on this interpreter, rather "interp * delete" or the equivalent deletion of the command in the master. * First ensure that the cleanup callback doesn't try to delete the * interp again. */ slavePtr->slaveInterp = NULL; Tcl_DeleteCommandFromToken(slavePtr->masterInterp, slavePtr->interpCmd); } /* * There shouldn't be any aliases left. */ if (slavePtr->aliasTable.numEntries != 0) { Tcl_Panic("InterpInfoDeleteProc: still exist aliases"); } Tcl_DeleteHashTable(&slavePtr->aliasTable); ckfree((char *) interpInfoPtr); }  /* *---------------------------------------------------------------------- * * Tcl_InterpObjCmd -- * * This function is invoked to process the "interp" Tcl command. See the * user documentation for details on what it does. * * Results: * A standard Tcl result. * * Side effects: * See the user documentation. * *---------------------------------------------------------------------- */ /* ARGSUSED */ int Tcl_InterpObjCmd( ClientData clientData, /* Unused. */ Tcl_Interp *interp, /* Current interpreter. */ int objc, /* Number of arguments. */ Tcl_Obj *const objv[]) /* Argument objects. */ { int index; static const char *options[] = { "alias", "aliases", "bgerror", "create", "delete", "eval", "exists", "expose", "hide", "hidden", "issafe", "invokehidden", "limit", "marktrusted", "recursionlimit","slaves", "share", "target", "transfer", NULL }; enum option { OPT_ALIAS, OPT_ALIASES, OPT_BGERROR, OPT_CREATE, OPT_DELETE, OPT_EVAL, OPT_EXISTS, OPT_EXPOSE, OPT_HIDE, OPT_HIDDEN, OPT_ISSAFE, OPT_INVOKEHID, OPT_LIMIT, OPT_MARKTRUSTED,OPT_RECLIMIT, OPT_SLAVES, OPT_SHARE, OPT_TARGET, OPT_TRANSFER }; if (objc < 2) { Tcl_WrongNumArgs(interp, 1, objv, "cmd ?arg ...?"); return TCL_ERROR; } if (Tcl_GetIndexFromObj(interp, objv[1], options, "option", 0, &index) != TCL_OK) { return TCL_ERROR; } switch ((enum option) index) { case OPT_ALIAS: { Tcl_Interp *slaveInterp, *masterInterp; if (objc < 4) { aliasArgs: Tcl_WrongNumArgs(interp, 2, objv, "slavePath slaveCmd ?masterPath masterCmd? ?args ..?"); return TCL_ERROR; } slaveInterp = GetInterp(interp, objv[2]); if (slaveInterp == NULL) { return TCL_ERROR; } if (objc == 4) { return AliasDescribe(interp, slaveInterp, objv[3]); } if ((objc == 5) && (TclGetString(objv[4])[0] == '\0')) { return AliasDelete(interp, slaveInterp, objv[3]); } if (objc > 5) { masterInterp = GetInterp(interp, objv[4]); if (masterInterp == NULL) { return TCL_ERROR; } if (TclGetString(objv[5])[0] == '\0') { if (objc == 6) { return AliasDelete(interp, slaveInterp, objv[3]); } } else { return AliasCreate(interp, slaveInterp, masterInterp, objv[3], objv[5], objc - 6, objv + 6); } } goto aliasArgs; } case OPT_ALIASES: { Tcl_Interp *slaveInterp; slaveInterp = GetInterp2(interp, objc, objv); if (slaveInterp == NULL) { return TCL_ERROR; } return AliasList(interp, slaveInterp); } case OPT_BGERROR: { Tcl_Interp *slaveInterp; if (objc != 3 && objc != 4) { Tcl_WrongNumArgs(interp, 2, objv, "path ?cmdPrefix?"); return TCL_ERROR; } slaveInterp = GetInterp(interp, objv[2]); if (slaveInterp == NULL) { return TCL_ERROR; } return SlaveBgerror(interp, slaveInterp, objc - 3, objv + 3); } case OPT_CREATE: { int i, last, safe; Tcl_Obj *slavePtr; char buf[16 + TCL_INTEGER_SPACE]; static const char *options[] = { "-safe", "--", NULL }; enum option { OPT_SAFE, OPT_LAST }; safe = Tcl_IsSafe(interp); /* * Weird historical rules: "-safe" is accepted at the end, too. */ slavePtr = NULL; last = 0; for (i = 2; i < objc; i++) { if ((last == 0) && (Tcl_GetString(objv[i])[0] == '-')) { if (Tcl_GetIndexFromObj(interp, objv[i], options, "option", 0, &index) != TCL_OK) { return TCL_ERROR; } if (index == OPT_SAFE) { safe = 1; continue; } i++; last = 1; } if (slavePtr != NULL) { Tcl_WrongNumArgs(interp, 2, objv, "?-safe? ?--? ?path?"); return TCL_ERROR; } if (i < objc) { slavePtr = objv[i]; } } buf[0] = '\0'; if (slavePtr == NULL) { /* * Create an anonymous interpreter -- we choose its name and the * name of the command. We check that the command name that we use * for the interpreter does not collide with an existing command * in the master interpreter. */ for (i = 0; ; i++) { Tcl_CmdInfo cmdInfo; sprintf(buf, "interp%d", i); if (Tcl_GetCommandInfo(interp, buf, &cmdInfo) == 0) { break; } } slavePtr = Tcl_NewStringObj(buf, -1); } if (SlaveCreate(interp, slavePtr, safe) == NULL) { if (buf[0] != '\0') { Tcl_DecrRefCount(slavePtr); } return TCL_ERROR; } Tcl_SetObjResult(interp, slavePtr); return TCL_OK; } case OPT_DELETE: { int i; InterpInfo *iiPtr; Tcl_Interp *slaveInterp; for (i = 2; i < objc; i++) { slaveInterp = GetInterp(interp, objv[i]); if (slaveInterp == NULL) { return TCL_ERROR; } else if (slaveInterp == interp) { Tcl_SetObjResult(interp, Tcl_NewStringObj( "cannot delete the current interpreter", -1)); return TCL_ERROR; } iiPtr = (InterpInfo *) ((Interp *) slaveInterp)->interpInfo; Tcl_DeleteCommandFromToken(iiPtr->slave.masterInterp, iiPtr->slave.interpCmd); } return TCL_OK; } case OPT_EVAL: { Tcl_Interp *slaveInterp; if (objc < 4) { Tcl_WrongNumArgs(interp, 2, objv, "path arg ?arg ...?"); return TCL_ERROR; } slaveInterp = GetInterp(interp, objv[2]); if (slaveInterp == NULL) { return TCL_ERROR; } return SlaveEval(interp, slaveInterp, objc - 3, objv + 3); } case OPT_EXISTS: { int exists; Tcl_Interp *slaveInterp; exists = 1; slaveInterp = GetInterp2(interp, objc, objv); if (slaveInterp == NULL) { if (objc > 3) { return TCL_ERROR; } Tcl_ResetResult(interp); exists = 0; } Tcl_SetObjResult(interp, Tcl_NewBooleanObj(exists)); return TCL_OK; } case OPT_EXPOSE: { Tcl_Interp *slaveInterp; if ((objc < 4) || (objc > 5)) { Tcl_WrongNumArgs(interp, 2, objv, "path hiddenCmdName ?cmdName?"); return TCL_ERROR; } slaveInterp = GetInterp(interp, objv[2]); if (slaveInterp == NULL) { return TCL_ERROR; } return SlaveExpose(interp, slaveInterp, objc - 3, objv + 3); } case OPT_HIDE: { Tcl_Interp *slaveInterp; /* A slave. */ if ((objc < 4) || (objc > 5)) { Tcl_WrongNumArgs(interp, 2, objv, "path cmdName ?hiddenCmdName?"); return TCL_ERROR; } slaveInterp = GetInterp(interp, objv[2]); if (slaveInterp == NULL) { return TCL_ERROR; } return SlaveHide(interp, slaveInterp, objc - 3, objv + 3); } case OPT_HIDDEN: { Tcl_Interp *slaveInterp; /* A slave. */ slaveInterp = GetInterp2(interp, objc, objv); if (slaveInterp == NULL) { return TCL_ERROR; } return SlaveHidden(interp, slaveInterp); } case OPT_ISSAFE: { Tcl_Interp *slaveInterp; slaveInterp = GetInterp2(interp, objc, objv); if (slaveInterp == NULL) { return TCL_ERROR; } Tcl_SetObjResult(interp, Tcl_NewBooleanObj(Tcl_IsSafe(slaveInterp))); return TCL_OK; } case OPT_INVOKEHID: { int i, index; const char *namespaceName; Tcl_Interp *slaveInterp; static const char *hiddenOptions[] = { "-global", "-namespace", "--", NULL }; enum hiddenOption { OPT_GLOBAL, OPT_NAMESPACE, OPT_LAST }; namespaceName = NULL; for (i = 3; i < objc; i++) { if (TclGetString(objv[i])[0] != '-') { break; } if (Tcl_GetIndexFromObj(interp, objv[i], hiddenOptions, "option", 0, &index) != TCL_OK) { return TCL_ERROR; } if (index == OPT_GLOBAL) { namespaceName = "::"; } else if (index == OPT_NAMESPACE) { if (++i == objc) { /* There must be more arguments. */ break; } else { namespaceName = TclGetString(objv[i]); } } else { i++; break; } } if (objc - i < 1) { Tcl_WrongNumArgs(interp, 2, objv, "path ?-namespace ns? ?-global? ?--? cmd ?arg ..?"); return TCL_ERROR; } slaveInterp = GetInterp(interp, objv[2]); if (slaveInterp == NULL) { return TCL_ERROR; } return SlaveInvokeHidden(interp, slaveInterp, namespaceName, objc - i, objv + i); } case OPT_LIMIT: { Tcl_Interp *slaveInterp; static const char *limitTypes[] = { "commands", "time", NULL }; enum LimitTypes { LIMIT_TYPE_COMMANDS, LIMIT_TYPE_TIME }; int limitType; if (objc < 4) { Tcl_WrongNumArgs(interp, 2, objv, "path limitType ?options?"); return TCL_ERROR; } slaveInterp = GetInterp(interp, objv[2]); if (slaveInterp == NULL) { return TCL_ERROR; } if (Tcl_GetIndexFromObj(interp, objv[3], limitTypes, "limit type", 0, &limitType) != TCL_OK) { return TCL_ERROR; } switch ((enum LimitTypes) limitType) { case LIMIT_TYPE_COMMANDS: return SlaveCommandLimitCmd(interp, slaveInterp, 4, objc,objv); case LIMIT_TYPE_TIME: return SlaveTimeLimitCmd(interp, slaveInterp, 4, objc, objv); } } case OPT_MARKTRUSTED: { Tcl_Interp *slaveInterp; if (objc != 3) { Tcl_WrongNumArgs(interp, 2, objv, "path"); return TCL_ERROR; } slaveInterp = GetInterp(interp, objv[2]); if (slaveInterp == NULL) { return TCL_ERROR; } return SlaveMarkTrusted(interp, slaveInterp); } case OPT_RECLIMIT: { Tcl_Interp *slaveInterp; if (objc != 3 && objc != 4) { Tcl_WrongNumArgs(interp, 2, objv, "path ?newlimit?"); return TCL_ERROR; } slaveInterp = GetInterp(interp, objv[2]); if (slaveInterp == NULL) { return TCL_ERROR; } return SlaveRecursionLimit(interp, slaveInterp, objc - 3, objv + 3); } case OPT_SLAVES: { Tcl_Interp *slaveInterp; InterpInfo *iiPtr; Tcl_Obj *resultPtr; Tcl_HashEntry *hPtr; Tcl_HashSearch hashSearch; char *string; slaveInterp = GetInterp2(interp, objc, objv); if (slaveInterp == NULL) { return TCL_ERROR; } iiPtr = (InterpInfo *) ((Interp *) slaveInterp)->interpInfo; resultPtr = Tcl_NewObj(); hPtr = Tcl_FirstHashEntry(&iiPtr->master.slaveTable, &hashSearch); for ( ; hPtr != NULL; hPtr = Tcl_NextHashEntry(&hashSearch)) { string = Tcl_GetHashKey(&iiPtr->master.slaveTable, hPtr); Tcl_ListObjAppendElement(NULL, resultPtr, Tcl_NewStringObj(string, -1)); } Tcl_SetObjResult(interp, resultPtr); return TCL_OK; } case OPT_TRANSFER: case OPT_SHARE: { Tcl_Interp *slaveInterp; /* A slave. */ Tcl_Interp *masterInterp; /* Its master. */ Tcl_Channel chan; if (objc != 5) { Tcl_WrongNumArgs(interp, 2, objv, "srcPath channelId destPath"); return TCL_ERROR; } masterInterp = GetInterp(interp, objv[2]); if (masterInterp == NULL) { return TCL_ERROR; } chan = Tcl_GetChannel(masterInterp, TclGetString(objv[3]), NULL); if (chan == NULL) { TclTransferResult(masterInterp, TCL_OK, interp); return TCL_ERROR; } slaveInterp = GetInterp(interp, objv[4]); if (slaveInterp == NULL) { return TCL_ERROR; } Tcl_RegisterChannel(slaveInterp, chan); if (index == OPT_TRANSFER) { /* * When transferring, as opposed to sharing, we must unhitch the * channel from the interpreter where it started. */ if (Tcl_UnregisterChannel(masterInterp, chan) != TCL_OK) { TclTransferResult(masterInterp, TCL_OK, interp); return TCL_ERROR; } } return TCL_OK; } case OPT_TARGET: { Tcl_Interp *slaveInterp; InterpInfo *iiPtr; Tcl_HashEntry *hPtr; Alias *aliasPtr; char *aliasName; if (objc != 4) { Tcl_WrongNumArgs(interp, 2, objv, "path alias"); return TCL_ERROR; } slaveInterp = GetInterp(interp, objv[2]); if (slaveInterp == NULL) { return TCL_ERROR; } aliasName = TclGetString(objv[3]); iiPtr = (InterpInfo *) ((Interp *) slaveInterp)->interpInfo; hPtr = Tcl_FindHashEntry(&iiPtr->slave.aliasTable, aliasName); if (hPtr == NULL) { Tcl_AppendResult(interp, "alias \"", aliasName, "\" in path \"", Tcl_GetString(objv[2]), "\" not found", NULL); Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "ALIAS", aliasName, NULL); return TCL_ERROR; } aliasPtr = Tcl_GetHashValue(hPtr); if (Tcl_GetInterpPath(interp, aliasPtr->targetInterp) != TCL_OK) { Tcl_ResetResult(interp); Tcl_AppendResult(interp, "target interpreter for alias \"", aliasName, "\" in path \"", Tcl_GetString(objv[2]), "\" is not my descendant", NULL); return TCL_ERROR; } return TCL_OK; } } return TCL_OK; }  /* *--------------------------------------------------------------------------- * * GetInterp2 -- * * Helper function for Tcl_InterpObjCmd() to convert the interp name * potentially specified on the command line to an Tcl_Interp. * * Results: * The return value is the interp specified on the command line, or the * interp argument itself if no interp was specified on the command line. * If the interp could not be found or the wrong number of arguments was * specified on the command line, the return value is NULL and an error * message is left in the interp's result. * * Side effects: * None. * *--------------------------------------------------------------------------- */ static Tcl_Interp * GetInterp2( Tcl_Interp *interp, /* Default interp if no interp was specified * on the command line. */ int objc, /* Number of arguments. */ Tcl_Obj *const objv[]) /* Argument objects. */ { if (objc == 2) { return interp; } else if (objc == 3) { return GetInterp(interp, objv[2]); } else { Tcl_WrongNumArgs(interp, 2, objv, "?path?"); return NULL; } }  /* *---------------------------------------------------------------------- * * Tcl_CreateAlias -- * * Creates an alias between two interpreters. * * Results: * A standard Tcl result. * * Side effects: * Creates a new alias, manipulates the result field of slaveInterp. * *---------------------------------------------------------------------- */ int Tcl_CreateAlias( Tcl_Interp *slaveInterp, /* Interpreter for source command. */ const char *slaveCmd, /* Command to install in slave. */ Tcl_Interp *targetInterp, /* Interpreter for target command. */ const char *targetCmd, /* Name of target command. */ int argc, /* How many additional arguments? */ const char *const *argv) /* These are the additional args. */ { Tcl_Obj *slaveObjPtr, *targetObjPtr; Tcl_Obj **objv; int i; int result; objv = (Tcl_Obj **) TclStackAlloc(slaveInterp, (unsigned) sizeof(Tcl_Obj *) * argc); for (i = 0; i < argc; i++) { objv[i] = Tcl_NewStringObj(argv[i], -1); Tcl_IncrRefCount(objv[i]); } slaveObjPtr = Tcl_NewStringObj(slaveCmd, -1); Tcl_IncrRefCount(slaveObjPtr); targetObjPtr = Tcl_NewStringObj(targetCmd, -1); Tcl_IncrRefCount(targetObjPtr); result = AliasCreate(slaveInterp, slaveInterp, targetInterp, slaveObjPtr, targetObjPtr, argc, objv); for (i = 0; i < argc; i++) { Tcl_DecrRefCount(objv[i]); } TclStackFree(slaveInterp, objv); Tcl_DecrRefCount(targetObjPtr); Tcl_DecrRefCount(slaveObjPtr); return result; }  /* *---------------------------------------------------------------------- * * Tcl_CreateAliasObj -- * * Object version: Creates an alias between two interpreters. * * Results: * A standard Tcl result. * * Side effects: * Creates a new alias. * *---------------------------------------------------------------------- */ int Tcl_CreateAliasObj( Tcl_Interp *slaveInterp, /* Interpreter for source command. */ const char *slaveCmd, /* Command to install in slave. */ Tcl_Interp *targetInterp, /* Interpreter for target command. */ const char *targetCmd, /* Name of target command. */ int objc, /* How many additional arguments? */ Tcl_Obj *const objv[]) /* Argument vector. */ { Tcl_Obj *slaveObjPtr, *targetObjPtr; int result; slaveObjPtr = Tcl_NewStringObj(slaveCmd, -1); Tcl_IncrRefCount(slaveObjPtr); targetObjPtr = Tcl_NewStringObj(targetCmd, -1); Tcl_IncrRefCount(targetObjPtr); result = AliasCreate(slaveInterp, slaveInterp, targetInterp, slaveObjPtr, targetObjPtr, objc, objv); Tcl_DecrRefCount(slaveObjPtr); Tcl_DecrRefCount(targetObjPtr); return result; }  /* *---------------------------------------------------------------------- * * Tcl_GetAlias -- * * Gets information about an alias. * * Results: * A standard Tcl result. * * Side effects: * None. * *---------------------------------------------------------------------- */ int Tcl_GetAlias( Tcl_Interp *interp, /* Interp to start search from. */ const char *aliasName, /* Name of alias to find. */ Tcl_Interp **targetInterpPtr, /* (Return) target interpreter. */ const char **targetNamePtr, /* (Return) name of target command. */ int *argcPtr, /* (Return) count of addnl args. */ const char ***argvPtr) /* (Return) additional arguments. */ { InterpInfo *iiPtr = (InterpInfo *) ((Interp *) interp)->interpInfo; Tcl_HashEntry *hPtr; Alias *aliasPtr; int i, objc; Tcl_Obj **objv; hPtr = Tcl_FindHashEntry(&iiPtr->slave.aliasTable, aliasName); if (hPtr == NULL) { Tcl_AppendResult(interp, "alias \"", aliasName, "\" not found", NULL); Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "ALIAS", aliasName, NULL); return TCL_ERROR; } aliasPtr = Tcl_GetHashValue(hPtr); objc = aliasPtr->objc; objv = &aliasPtr->objPtr; if (targetInterpPtr != NULL) { *targetInterpPtr = aliasPtr->targetInterp; } if (targetNamePtr != NULL) { *targetNamePtr = TclGetString(objv[0]); } if (argcPtr != NULL) { *argcPtr = objc - 1; } if (argvPtr != NULL) { *argvPtr = (const char **) ckalloc((unsigned) sizeof(const char *) * (objc - 1)); for (i = 1; i < objc; i++) { (*argvPtr)[i - 1] = TclGetString(objv[i]); } } return TCL_OK; }  /* *---------------------------------------------------------------------- * * Tcl_GetAliasObj -- * * Object version: Gets information about an alias. * * Results: * A standard Tcl result. * * Side effects: * None. * *---------------------------------------------------------------------- */ int Tcl_GetAliasObj( Tcl_Interp *interp, /* Interp to start search from. */ const char *aliasName, /* Name of alias to find. */ Tcl_Interp **targetInterpPtr, /* (Return) target interpreter. */ const char **targetNamePtr, /* (Return) name of target command. */ int *objcPtr, /* (Return) count of addnl args. */ Tcl_Obj ***objvPtr) /* (Return) additional args. */ { InterpInfo *iiPtr = (InterpInfo *) ((Interp *) interp)->interpInfo; Tcl_HashEntry *hPtr; Alias *aliasPtr; int objc; Tcl_Obj **objv; hPtr = Tcl_FindHashEntry(&iiPtr->slave.aliasTable, aliasName); if (hPtr == NULL) { Tcl_AppendResult(interp, "alias \"", aliasName, "\" not found", NULL); Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "ALIAS", aliasName, NULL); return TCL_ERROR; } aliasPtr = Tcl_GetHashValue(hPtr); objc = aliasPtr->objc; objv = &aliasPtr->objPtr; if (targetInterpPtr != NULL) { *targetInterpPtr = aliasPtr->targetInterp; } if (targetNamePtr != NULL) { *targetNamePtr = TclGetString(objv[0]); } if (objcPtr != NULL) { *objcPtr = objc - 1; } if (objvPtr != NULL) { *objvPtr = objv + 1; } return TCL_OK; }  /* *---------------------------------------------------------------------- * * TclPreventAliasLoop -- * * When defining an alias or renaming a command, prevent an alias loop * from being formed. * * Results: * A standard Tcl object result. * * Side effects: * If TCL_ERROR is returned, the function also stores an error message in * the interpreter's result object. * * NOTE: * This function is public internal (instead of being static to this * file) because it is also used from TclRenameCommand. * *---------------------------------------------------------------------- */ int TclPreventAliasLoop( Tcl_Interp *interp, /* Interp in which to report errors. */ Tcl_Interp *cmdInterp, /* Interp in which the command is being * defined. */ Tcl_Command cmd) /* Tcl command we are attempting to define. */ { Command *cmdPtr = (Command *) cmd; Alias *aliasPtr, *nextAliasPtr; Tcl_Command aliasCmd; Command *aliasCmdPtr; /* * If we are not creating or renaming an alias, then it is always OK to * create or rename the command. */ if (cmdPtr->objProc != AliasObjCmd) { return TCL_OK; } /* * OK, we are dealing with an alias, so traverse the chain of aliases. If * we encounter the alias we are defining (or renaming to) any in the * chain then we have a loop. */ aliasPtr = (Alias *) cmdPtr->objClientData; nextAliasPtr = aliasPtr; while (1) { Tcl_Obj *cmdNamePtr; /* * If the target of the next alias in the chain is the same as the * source alias, we have a loop. */ if (Tcl_InterpDeleted(nextAliasPtr->targetInterp)) { /* * The slave interpreter can be deleted while creating the alias. * [Bug #641195] */ Tcl_AppendResult(interp, "cannot define or rename alias \"", Tcl_GetCommandName(cmdInterp, cmd), "\": interpreter deleted", NULL); return TCL_ERROR; } cmdNamePtr = nextAliasPtr->objPtr; aliasCmd = Tcl_FindCommand(nextAliasPtr->targetInterp, TclGetString(cmdNamePtr), Tcl_GetGlobalNamespace(nextAliasPtr->targetInterp), /*flags*/ 0); if (aliasCmd == NULL) { return TCL_OK; } aliasCmdPtr = (Command *) aliasCmd; if (aliasCmdPtr == cmdPtr) { Tcl_AppendResult(interp, "cannot define or rename alias \"", Tcl_GetCommandName(cmdInterp, cmd), "\": would create a loop", NULL); return TCL_ERROR; } /* * Otherwise, follow the chain one step further. See if the target * command is an alias - if so, follow the loop to its target command. * Otherwise we do not have a loop. */ if (aliasCmdPtr->objProc != AliasObjCmd) { return TCL_OK; } nextAliasPtr = (Alias *) aliasCmdPtr->objClientData; } /* NOTREACHED */ }  /* *---------------------------------------------------------------------- * * AliasCreate -- * * Helper function to do the work to actually create an alias. * * Results: * A standard Tcl result. * * Side effects: * An alias command is created and entered into the alias table for the * slave interpreter. * *---------------------------------------------------------------------- */ static int AliasCreate( Tcl_Interp *interp, /* Interp for error reporting. */ Tcl_Interp *slaveInterp, /* Interp where alias cmd will live or from * which alias will be deleted. */ Tcl_Interp *masterInterp, /* Interp in which target command will be * invoked. */ Tcl_Obj *namePtr, /* Name of alias cmd. */ Tcl_Obj *targetNamePtr, /* Name of target cmd. */ int objc, /* Additional arguments to store */ Tcl_Obj *const objv[]) /* with alias. */ { Alias *aliasPtr; Tcl_HashEntry *hPtr; Target *targetPtr; Slave *slavePtr; Master *masterPtr; Tcl_Obj **prefv; int isNew, i; aliasPtr = (Alias *) ckalloc((unsigned) (sizeof(Alias) + objc * sizeof(Tcl_Obj *))); aliasPtr->token = namePtr; Tcl_IncrRefCount(aliasPtr->token); aliasPtr->targetInterp = masterInterp; aliasPtr->objc = objc + 1; prefv = &aliasPtr->objPtr; *prefv = targetNamePtr; Tcl_IncrRefCount(targetNamePtr); for (i = 0; i < objc; i++) { *(++prefv) = objv[i]; Tcl_IncrRefCount(objv[i]); } Tcl_Preserve(slaveInterp); Tcl_Preserve(masterInterp); aliasPtr->slaveCmd = Tcl_CreateObjCommand(slaveInterp, TclGetString(namePtr), AliasObjCmd, aliasPtr, AliasObjCmdDeleteProc); if (TclPreventAliasLoop(interp, slaveInterp, aliasPtr->slaveCmd) != TCL_OK) { /* * Found an alias loop! The last call to Tcl_CreateObjCommand made the * alias point to itself. Delete the command and its alias record. Be * careful to wipe out its client data first, so the command doesn't * try to delete itself. */ Command *cmdPtr; Tcl_DecrRefCount(aliasPtr->token); Tcl_DecrRefCount(targetNamePtr); for (i = 0; i < objc; i++) { Tcl_DecrRefCount(objv[i]); } cmdPtr = (Command *) aliasPtr->slaveCmd; cmdPtr->clientData = NULL; cmdPtr->deleteProc = NULL; cmdPtr->deleteData = NULL; Tcl_DeleteCommandFromToken(slaveInterp, aliasPtr->slaveCmd); ckfree((char *) aliasPtr); /* * The result was already set by TclPreventAliasLoop. */ Tcl_Release(slaveInterp); Tcl_Release(masterInterp); return TCL_ERROR; } /* * Make an entry in the alias table. If it already exists, retry. */ slavePtr = &((InterpInfo *) ((Interp *) slaveInterp)->interpInfo)->slave; while (1) { Tcl_Obj *newToken; char *string; string = TclGetString(aliasPtr->token); hPtr = Tcl_CreateHashEntry(&slavePtr->aliasTable, string, &isNew); if (isNew != 0) { break; } /* * The alias name cannot be used as unique token, it is already taken. * We can produce a unique token by prepending "::" repeatedly. This * algorithm is a stop-gap to try to maintain the command name as * token for most use cases, fearful of possible backwards compat * problems. A better algorithm would produce unique tokens that need * not be related to the command name. * * ATTENTION: the tests in interp.test and possibly safe.test depend * on the precise definition of these tokens. */ TclNewLiteralStringObj(newToken, "::"); Tcl_AppendObjToObj(newToken, aliasPtr->token); Tcl_DecrRefCount(aliasPtr->token); aliasPtr->token = newToken; Tcl_IncrRefCount(aliasPtr->token); } aliasPtr->aliasEntryPtr = hPtr; Tcl_SetHashValue(hPtr, aliasPtr); /* * Create the new command. We must do it after deleting any old command, * because the alias may be pointing at a renamed alias, as in: * * interp alias {} foo {} bar # Create an alias "foo" * rename foo zop # Now rename the alias * interp alias {} foo {} zop # Now recreate "foo"... */ targetPtr = (Target *) ckalloc((unsigned) sizeof(Target)); targetPtr->slaveCmd = aliasPtr->slaveCmd; targetPtr->slaveInterp = slaveInterp; masterPtr = &((InterpInfo *) ((Interp*) masterInterp)->interpInfo)->master; targetPtr->nextPtr = masterPtr->targetsPtr; targetPtr->prevPtr = NULL; if (masterPtr->targetsPtr != NULL) { masterPtr->targetsPtr->prevPtr = targetPtr; } masterPtr->targetsPtr = targetPtr; aliasPtr->targetPtr = targetPtr; Tcl_SetObjResult(interp, aliasPtr->token); Tcl_Release(slaveInterp); Tcl_Release(masterInterp); return TCL_OK; }  /* *---------------------------------------------------------------------- * * AliasDelete -- * * Deletes the given alias from the slave interpreter given. * * Results: * A standard Tcl result. * * Side effects: * Deletes the alias from the slave interpreter. * *---------------------------------------------------------------------- */ static int AliasDelete( Tcl_Interp *interp, /* Interpreter for result & errors. */ Tcl_Interp *slaveInterp, /* Interpreter containing alias. */ Tcl_Obj *namePtr) /* Name of alias to delete. */ { Slave *slavePtr; Alias *aliasPtr; Tcl_HashEntry *hPtr; /* * If the alias has been renamed in the slave, the master can still use * the original name (with which it was created) to find the alias to * delete it. */ slavePtr = &((InterpInfo *) ((Interp *) slaveInterp)->interpInfo)->slave; hPtr = Tcl_FindHashEntry(&slavePtr->aliasTable, TclGetString(namePtr)); if (hPtr == NULL) { Tcl_AppendResult(interp, "alias \"", TclGetString(namePtr), "\" not found", NULL); Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "ALIAS", TclGetString(namePtr), NULL); return TCL_ERROR; } aliasPtr = Tcl_GetHashValue(hPtr); Tcl_DeleteCommandFromToken(slaveInterp, aliasPtr->slaveCmd); return TCL_OK; }  /* *---------------------------------------------------------------------- * * AliasDescribe -- * * Sets the interpreter's result object to a Tcl list describing the * given alias in the given interpreter: its target command and the * additional arguments to prepend to any invocation of the alias. * * Results: * A standard Tcl result. * * Side effects: * None. * *---------------------------------------------------------------------- */ static int AliasDescribe( Tcl_Interp *interp, /* Interpreter for result & errors. */ Tcl_Interp *slaveInterp, /* Interpreter containing alias. */ Tcl_Obj *namePtr) /* Name of alias to describe. */ { Slave *slavePtr; Tcl_HashEntry *hPtr; Alias *aliasPtr; Tcl_Obj *prefixPtr; /* * If the alias has been renamed in the slave, the master can still use * the original name (with which it was created) to find the alias to * describe it. */ slavePtr = &((InterpInfo *) ((Interp *) slaveInterp)->interpInfo)->slave; hPtr = Tcl_FindHashEntry(&slavePtr->aliasTable, Tcl_GetString(namePtr)); if (hPtr == NULL) { return TCL_OK; } aliasPtr = Tcl_GetHashValue(hPtr); prefixPtr = Tcl_NewListObj(aliasPtr->objc, &aliasPtr->objPtr); Tcl_SetObjResult(interp, prefixPtr); return TCL_OK; }  /* *---------------------------------------------------------------------- * * AliasList -- * * Computes a list of aliases defined in a slave interpreter. * * Results: * A standard Tcl result. * * Side effects: * None. * *---------------------------------------------------------------------- */ static int AliasList( Tcl_Interp *interp, /* Interp for data return. */ Tcl_Interp *slaveInterp) /* Interp whose aliases to compute. */ { Tcl_HashEntry *entryPtr; Tcl_HashSearch hashSearch; Tcl_Obj *resultPtr = Tcl_NewObj(); Alias *aliasPtr; Slave *slavePtr; slavePtr = &((InterpInfo *) ((Interp *) slaveInterp)->interpInfo)->slave; entryPtr = Tcl_FirstHashEntry(&slavePtr->aliasTable, &hashSearch); for ( ; entryPtr != NULL; entryPtr = Tcl_NextHashEntry(&hashSearch)) { aliasPtr = Tcl_GetHashValue(entryPtr); Tcl_ListObjAppendElement(NULL, resultPtr, aliasPtr->token); } Tcl_SetObjResult(interp, resultPtr); return TCL_OK; }  /* *---------------------------------------------------------------------- * * AliasObjCmd -- * * This is the function that services invocations of aliases in a slave * interpreter. One such command exists for each alias. When invoked, * this function redirects the invocation to the target command in the * master interpreter as designated by the Alias record associated with * this command. * * Results: * A standard Tcl result. * * Side effects: * Causes forwarding of the invocation; all possible side effects may * occur as a result of invoking the command to which the invocation is * forwarded. * *---------------------------------------------------------------------- */ static int AliasObjCmd( ClientData clientData, /* Alias record. */ Tcl_Interp *interp, /* Current interpreter. */ int objc, /* Number of arguments. */ Tcl_Obj *const objv[]) /* Argument vector. */ { #define ALIAS_CMDV_PREALLOC 10 Alias *aliasPtr = clientData; Tcl_Interp *targetInterp = aliasPtr->targetInterp; int result, prefc, cmdc, i; Tcl_Obj **prefv, **cmdv; Tcl_Obj *cmdArr[ALIAS_CMDV_PREALLOC]; Interp *tPtr = (Interp *) targetInterp; int isRootEnsemble = (tPtr->ensembleRewrite.sourceObjs == NULL); /* * Append the arguments to the command prefix and invoke the command in * the target interp's global namespace. */ prefc = aliasPtr->objc; prefv = &aliasPtr->objPtr; cmdc = prefc + objc - 1; if (cmdc <= ALIAS_CMDV_PREALLOC) { cmdv = cmdArr; } else { cmdv = (Tcl_Obj **) TclStackAlloc(interp, cmdc*(int)sizeof(Tcl_Obj*)); } prefv = &aliasPtr->objPtr; memcpy(cmdv, prefv, (size_t) (prefc * sizeof(Tcl_Obj *))); memcpy(cmdv+prefc, objv+1, (size_t) ((objc-1) * sizeof(Tcl_Obj *))); Tcl_ResetResult(targetInterp); for (i=0; i<cmdc; i++) { Tcl_IncrRefCount(cmdv[i]); } /* * Use the ensemble rewriting machinery to ensure correct error messages: * only the source command should show, not the full target prefix. */ if (isRootEnsemble) { tPtr->ensembleRewrite.sourceObjs = objv; tPtr->ensembleRewrite.numRemovedObjs = 1; tPtr->ensembleRewrite.numInsertedObjs = prefc; } else { tPtr->ensembleRewrite.numInsertedObjs += prefc - 1; } /* * Protect the target interpreter if it isn't the same as the source * interpreter so that we can continue to work with it after the target * command completes. */ if (targetInterp != interp) { Tcl_Preserve(targetInterp); } /* * Execute the target command in the target interpreter. */ result = Tcl_EvalObjv(targetInterp, cmdc, cmdv, TCL_EVAL_INVOKE); /* * Clean up the ensemble rewrite info if we set it in the first place. */ if (isRootEnsemble) { tPtr->ensembleRewrite.sourceObjs = NULL; tPtr->ensembleRewrite.numRemovedObjs = 0; tPtr->ensembleRewrite.numInsertedObjs = 0; } /* * If it was a cross-interpreter alias, we need to transfer the result * back to the source interpreter and release the lock we previously set * on the target interpreter. */ if (targetInterp != interp) { TclTransferResult(targetInterp, result, interp); Tcl_Release(targetInterp); } for (i=0; i<cmdc; i++) { Tcl_DecrRefCount(cmdv[i]); } if (cmdv != cmdArr) { TclStackFree(interp, cmdv); } return result; #undef ALIAS_CMDV_PREALLOC }  /* *---------------------------------------------------------------------- * * AliasObjCmdDeleteProc -- * * Is invoked when an alias command is deleted in a slave. Cleans up all * storage associated with this alias. * * Results: * None. * * Side effects: * Deletes the alias record and its entry in the alias table for the * interpreter. * *---------------------------------------------------------------------- */ static void AliasObjCmdDeleteProc( ClientData clientData) /* The alias record for this alias. */ { Alias *aliasPtr = clientData; Target *targetPtr; int i; Tcl_Obj **objv; Tcl_DecrRefCount(aliasPtr->token); objv = &aliasPtr->objPtr; for (i = 0; i < aliasPtr->objc; i++) { Tcl_DecrRefCount(objv[i]); } Tcl_DeleteHashEntry(aliasPtr->aliasEntryPtr); /* * Splice the target record out of the target interpreter's master list. */ targetPtr = aliasPtr->targetPtr; if (targetPtr->prevPtr != NULL) { targetPtr->prevPtr->nextPtr = targetPtr->nextPtr; } else { Master *masterPtr = &((InterpInfo *) ((Interp *) aliasPtr->targetInterp)->interpInfo)->master; masterPtr->targetsPtr = targetPtr->nextPtr; } if (targetPtr->nextPtr != NULL) { targetPtr->nextPtr->prevPtr = targetPtr->prevPtr; } ckfree((char *) targetPtr); ckfree((char *) aliasPtr); }  /* *---------------------------------------------------------------------- * * Tcl_CreateSlave -- * * Creates a slave interpreter. The slavePath argument denotes the name * of the new slave relative to the current interpreter; the slave is a * direct descendant of the one-before-last component of the path, * e.g. it is a descendant of the current interpreter if the slavePath * argument contains only one component. Optionally makes the slave * interpreter safe. * * Results: * Returns the interpreter structure created, or NULL if an error * occurred. * * Side effects: * Creates a new interpreter and a new interpreter object command in the * interpreter indicated by the slavePath argument. * *---------------------------------------------------------------------- */ Tcl_Interp * Tcl_CreateSlave( Tcl_Interp *interp, /* Interpreter to start search at. */ const char *slavePath, /* Name of slave to create. */ int isSafe) /* Should new slave be "safe" ? */ { Tcl_Obj *pathPtr; Tcl_Interp *slaveInterp; pathPtr = Tcl_NewStringObj(slavePath, -1); slaveInterp = SlaveCreate(interp, pathPtr, isSafe); Tcl_DecrRefCount(pathPtr); return slaveInterp; }  /* *---------------------------------------------------------------------- * * Tcl_GetSlave -- * * Finds a slave interpreter by its path name. * * Results: * Returns a Tcl_Interp * for the named interpreter or NULL if not found. * * Side effects: * None. * *---------------------------------------------------------------------- */ Tcl_Interp * Tcl_GetSlave( Tcl_Interp *interp, /* Interpreter to start search from. */ const char *slavePath) /* Path of slave to find. */ { Tcl_Obj *pathPtr; Tcl_Interp *slaveInterp; pathPtr = Tcl_NewStringObj(slavePath, -1); slaveInterp = GetInterp(interp, pathPtr); Tcl_DecrRefCount(pathPtr); return slaveInterp; }  /* *---------------------------------------------------------------------- * * Tcl_GetMaster -- * * Finds the master interpreter of a slave interpreter. * * Results: * Returns a Tcl_Interp * for the master interpreter or NULL if none. * * Side effects: * None. * *---------------------------------------------------------------------- */ Tcl_Interp * Tcl_GetMaster( Tcl_Interp *interp) /* Get the master of this interpreter. */ { Slave *slavePtr; /* Slave record of this interpreter. */ if (interp == NULL) { return NULL; } slavePtr = &((InterpInfo *) ((Interp *) interp)->interpInfo)->slave; return slavePtr->masterInterp; }  /* *---------------------------------------------------------------------- * * Tcl_GetInterpPath -- * * Sets the result of the asking interpreter to a proper Tcl list * containing the names of interpreters between the asking and target * interpreters. The target interpreter must be either the same as the * asking interpreter or one of its slaves (including recursively). * * Results: * TCL_OK if the target interpreter is the same as, or a descendant of, * the asking interpreter; TCL_ERROR else. This way one can distinguish * between the case where the asking and target interps are the same (an * empty list is the result, and TCL_OK is returned) and when the target * is not a descendant of the asking interpreter (in which case the Tcl * result is an error message and the function returns TCL_ERROR). * * Side effects: * None. * *---------------------------------------------------------------------- */ int Tcl_GetInterpPath( Tcl_Interp *askingInterp, /* Interpreter to start search from. */ Tcl_Interp *targetInterp) /* Interpreter to find. */ { InterpInfo *iiPtr; if (targetInterp == askingInterp) { return TCL_OK; } if (targetInterp == NULL) { return TCL_ERROR; } iiPtr = (InterpInfo *) ((Interp *) targetInterp)->interpInfo; if (Tcl_GetInterpPath(askingInterp, iiPtr->slave.masterInterp) != TCL_OK) { return TCL_ERROR; } Tcl_AppendElement(askingInterp, Tcl_GetHashKey(&iiPtr->master.slaveTable, iiPtr->slave.slaveEntryPtr)); return TCL_OK; }  /* *---------------------------------------------------------------------- * * GetInterp -- * * Helper function to find a slave interpreter given a pathname. * * Results: * Returns the slave interpreter known by that name in the calling * interpreter, or NULL if no interpreter known by that name exists. * * Side effects: * Assigns to the pointer variable passed in, if not NULL. * *---------------------------------------------------------------------- */ static Tcl_Interp * GetInterp( Tcl_Interp *interp, /* Interp. to start search from. */ Tcl_Obj *pathPtr) /* List object containing name of interp. to * be found. */ { Tcl_HashEntry *hPtr; /* Search element. */ Slave *slavePtr; /* Interim slave record. */ Tcl_Obj **objv; int objc, i; Tcl_Interp *searchInterp; /* Interim storage for interp. to find. */ InterpInfo *masterInfoPtr; if (TclListObjGetElements(interp, pathPtr, &objc, &objv) != TCL_OK) { return NULL; } searchInterp = interp; for (i = 0; i < objc; i++) { masterInfoPtr = (InterpInfo *) ((Interp *) searchInterp)->interpInfo; hPtr = Tcl_FindHashEntry(&masterInfoPtr->master.slaveTable, TclGetString(objv[i])); if (hPtr == NULL) { searchInterp = NULL; break; } slavePtr = Tcl_GetHashValue(hPtr); searchInterp = slavePtr->slaveInterp; if (searchInterp == NULL) { break; } } if (searchInterp == NULL) { Tcl_AppendResult(interp, "could not find interpreter \"", TclGetString(pathPtr), "\"", NULL); Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "INTERP", TclGetString(pathPtr), NULL); } return searchInterp; }  /* *---------------------------------------------------------------------- * * SlaveBgerror -- * * Helper function to set/query the background error handling command * prefix of an interp * * Results: * A standard Tcl result. * * Side effects: * When (objc == 1), slaveInterp will be set to a new background handler * of objv[0]. * *---------------------------------------------------------------------- */ static int SlaveBgerror( Tcl_Interp *interp, /* Interp for error return. */ Tcl_Interp *slaveInterp, /* Interp in which limit is set/queried. */ int objc, /* Set or Query. */ Tcl_Obj *const objv[]) /* Argument strings. */ { if (objc) { int length; if (TCL_ERROR == TclListObjLength(NULL, objv[0], &length) || (length < 1)) { Tcl_AppendResult(interp, "cmdPrefix must be list of length >= 1", NULL); return TCL_ERROR; } TclSetBgErrorHandler(interp, objv[0]); } Tcl_SetObjResult(interp, TclGetBgErrorHandler(interp)); return TCL_OK; }  /* *---------------------------------------------------------------------- * * SlaveCreate -- * * Helper function to do the actual work of creating a slave interp and * new object command. Also optionally makes the new slave interpreter * "safe". * * Results: * Returns the new Tcl_Interp * if successful or NULL if not. If failed, * the result of the invoking interpreter contains an error message. * * Side effects: * Creates a new slave interpreter and a new object command. * *---------------------------------------------------------------------- */ static Tcl_Interp * SlaveCreate( Tcl_Interp *interp, /* Interp. to start search from. */ Tcl_Obj *pathPtr, /* Path (name) of slave to create. */ int safe) /* Should we make it "safe"? */ { Tcl_Interp *masterInterp, *slaveInterp; Slave *slavePtr; InterpInfo *masterInfoPtr; Tcl_HashEntry *hPtr; char *path; int isNew, objc; Tcl_Obj **objv; if (Tcl_ListObjGetElements(interp, pathPtr, &objc, &objv) != TCL_OK) { return NULL; } if (objc < 2) { masterInterp = interp; path = TclGetString(pathPtr); } else { Tcl_Obj *objPtr; objPtr = Tcl_NewListObj(objc - 1, objv); masterInterp = GetInterp(interp, objPtr); Tcl_DecrRefCount(objPtr); if (masterInterp == NULL) { return NULL; } path = TclGetString(objv[objc - 1]); } if (safe == 0) { safe = Tcl_IsSafe(masterInterp); } masterInfoPtr = (InterpInfo *) ((Interp *) masterInterp)->interpInfo; hPtr = Tcl_CreateHashEntry(&masterInfoPtr->master.slaveTable, path, &isNew); if (isNew == 0) { Tcl_AppendResult(interp, "interpreter named \"", path, "\" already exists, cannot create", NULL); return NULL; } slaveInterp = Tcl_CreateInterp(); slavePtr = &((InterpInfo *) ((Interp *) slaveInterp)->interpInfo)->slave; slavePtr->masterInterp = masterInterp; slavePtr->slaveEntryPtr = hPtr; slavePtr->slaveInterp = slaveInterp; slavePtr->interpCmd = Tcl_CreateObjCommand(masterInterp, path, SlaveObjCmd, slaveInterp, SlaveObjCmdDeleteProc); Tcl_InitHashTable(&slavePtr->aliasTable, TCL_STRING_KEYS); Tcl_SetHashValue(hPtr, slavePtr); Tcl_SetVar(slaveInterp, "tcl_interactive", "0", TCL_GLOBAL_ONLY); /* * Inherit the recursion limit. */ ((Interp *) slaveInterp)->maxNestingDepth = ((Interp *) masterInterp)->maxNestingDepth; if (safe) { if (Tcl_MakeSafe(slaveInterp) == TCL_ERROR) { goto error; } } else { if (Tcl_Init(slaveInterp) == TCL_ERROR) { goto error; } /* * This will create the "memory" command in slave interpreters if we * compiled with TCL_MEM_DEBUG, otherwise it does nothing. */ Tcl_InitMemory(slaveInterp); } /* * Inherit the TIP#143 limits. */ InheritLimitsFromMaster(slaveInterp, masterInterp); /* * The [clock] command presents a safe API, but uses unsafe features in * its implementation. This means it has to be implemented in safe interps * as an alias to a version in the (trusted) master. */ if (safe) { Tcl_Obj *clockObj; int status; TclNewLiteralStringObj(clockObj, "clock"); Tcl_IncrRefCount(clockObj); status = AliasCreate(interp, slaveInterp, masterInterp, clockObj, clockObj, 0, NULL); Tcl_DecrRefCount(clockObj); if (status != TCL_OK) { goto error2; } } return slaveInterp; error: TclTransferResult(slaveInterp, TCL_ERROR, interp); error2: Tcl_DeleteInterp(slaveInterp); return NULL; }  /* *---------------------------------------------------------------------- * * SlaveObjCmd -- * * Command to manipulate an interpreter, e.g. to send commands to it to * be evaluated. One such command exists for each slave interpreter. * * Results: * A standard Tcl result. * * Side effects: * See user documentation for details. * *---------------------------------------------------------------------- */ static int SlaveObjCmd( ClientData clientData, /* Slave interpreter. */ Tcl_Interp *interp, /* Current interpreter. */ int objc, /* Number of arguments. */ Tcl_Obj *const objv[]) /* Argument objects. */ { Tcl_Interp *slaveInterp = clientData; int index; static const char *options[] = { "alias", "aliases", "bgerror", "eval", "expose", "hide", "hidden", "issafe", "invokehidden", "limit", "marktrusted", "recursionlimit", NULL }; enum options { OPT_ALIAS, OPT_ALIASES, OPT_BGERROR, OPT_EVAL, OPT_EXPOSE, OPT_HIDE, OPT_HIDDEN, OPT_ISSAFE, OPT_INVOKEHIDDEN, OPT_LIMIT, OPT_MARKTRUSTED, OPT_RECLIMIT }; if (slaveInterp == NULL) { Tcl_Panic("SlaveObjCmd: interpreter has been deleted"); } if (objc < 2) { Tcl_WrongNumArgs(interp, 1, objv, "cmd ?arg ...?"); return TCL_ERROR; } if (Tcl_GetIndexFromObj(interp, objv[1], options, "option", 0, &index) != TCL_OK) { return TCL_ERROR; } switch ((enum options) index) { case OPT_ALIAS: if (objc > 2) { if (objc == 3) { return AliasDescribe(interp, slaveInterp, objv[2]); } if (TclGetString(objv[3])[0] == '\0') { if (objc == 4) { return AliasDelete(interp, slaveInterp, objv[2]); } } else { return AliasCreate(interp, slaveInterp, interp, objv[2], objv[3], objc - 4, objv + 4); } } Tcl_WrongNumArgs(interp, 2, objv, "aliasName ?targetName? ?args..?"); return TCL_ERROR; case OPT_ALIASES: if (objc != 2) { Tcl_WrongNumArgs(interp, 2, objv, NULL); return TCL_ERROR; } return AliasList(interp, slaveInterp); case OPT_BGERROR: if (objc != 2 && objc != 3) { Tcl_WrongNumArgs(interp, 2, objv, "?cmdPrefix?"); return TCL_ERROR; } return SlaveBgerror(interp, slaveInterp, objc - 2, objv + 2); case OPT_EVAL: if (objc < 3) { Tcl_WrongNumArgs(interp, 2, objv, "arg ?arg ...?"); return TCL_ERROR; } return SlaveEval(interp, slaveInterp, objc - 2, objv + 2); case OPT_EXPOSE: if ((objc < 3) || (objc > 4)) { Tcl_WrongNumArgs(interp, 2, objv, "hiddenCmdName ?cmdName?"); return TCL_ERROR; } return SlaveExpose(interp, slaveInterp, objc - 2, objv + 2); case OPT_HIDE: if ((objc < 3) || (objc > 4)) { Tcl_WrongNumArgs(interp, 2, objv, "cmdName ?hiddenCmdName?"); return TCL_ERROR; } return SlaveHide(interp, slaveInterp, objc - 2, objv + 2); case OPT_HIDDEN: if (objc != 2) { Tcl_WrongNumArgs(interp, 2, objv, NULL); return TCL_ERROR; } return SlaveHidden(interp, slaveInterp); case OPT_ISSAFE: if (objc != 2) { Tcl_WrongNumArgs(interp, 2, objv, NULL); return TCL_ERROR; } Tcl_SetObjResult(interp, Tcl_NewBooleanObj(Tcl_IsSafe(slaveInterp))); return TCL_OK; case OPT_INVOKEHIDDEN: { int i, index; const char *namespaceName; static const char *hiddenOptions[] = { "-global", "-namespace", "--", NULL }; enum hiddenOption { OPT_GLOBAL, OPT_NAMESPACE, OPT_LAST }; namespaceName = NULL; for (i = 2; i < objc; i++) { if (TclGetString(objv[i])[0] != '-') { break; } if (Tcl_GetIndexFromObj(interp, objv[i], hiddenOptions, "option", 0, &index) != TCL_OK) { return TCL_ERROR; } if (index == OPT_GLOBAL) { namespaceName = "::"; } else if (index == OPT_NAMESPACE) { if (++i == objc) { /* There must be more arguments. */ break; } else { namespaceName = TclGetString(objv[i]); } } else { i++; break; } } if (objc - i < 1) { Tcl_WrongNumArgs(interp, 2, objv, "?-namespace ns? ?-global? ?--? cmd ?arg ..?"); return TCL_ERROR; } return SlaveInvokeHidden(interp, slaveInterp, namespaceName, objc - i, objv + i); } case OPT_LIMIT: { static const char *limitTypes[] = { "commands", "time", NULL }; enum LimitTypes { LIMIT_TYPE_COMMANDS, LIMIT_TYPE_TIME }; int limitType; if (objc < 3) { Tcl_WrongNumArgs(interp, 2, objv, "limitType ?options?"); return TCL_ERROR; } if (Tcl_GetIndexFromObj(interp, objv[2], limitTypes, "limit type", 0, &limitType) != TCL_OK) { return TCL_ERROR; } switch ((enum LimitTypes) limitType) { case LIMIT_TYPE_COMMANDS: return SlaveCommandLimitCmd(interp, slaveInterp, 3, objc,objv); case LIMIT_TYPE_TIME: return SlaveTimeLimitCmd(interp, slaveInterp, 3, objc, objv); } } case OPT_MARKTRUSTED: if (objc != 2) { Tcl_WrongNumArgs(interp, 2, objv, NULL); return TCL_ERROR; } return SlaveMarkTrusted(interp, slaveInterp); case OPT_RECLIMIT: if (objc != 2 && objc != 3) { Tcl_WrongNumArgs(interp, 2, objv, "?newlimit?"); return TCL_ERROR; } return SlaveRecursionLimit(interp, slaveInterp, objc - 2, objv + 2); } return TCL_ERROR; }  /* *---------------------------------------------------------------------- * * SlaveObjCmdDeleteProc -- * * Invoked when an object command for a slave interpreter is deleted; * cleans up all state associated with the slave interpreter and destroys * the slave interpreter. * * Results: * None. * * Side effects: * Cleans up all state associated with the slave interpreter and destroys * the slave interpreter. * *---------------------------------------------------------------------- */ static void SlaveObjCmdDeleteProc( ClientData clientData) /* The SlaveRecord for the command. */ { Slave *slavePtr; /* Interim storage for Slave record. */ Tcl_Interp *slaveInterp = clientData; /* And for a slave interp. */ slavePtr = &((InterpInfo *) ((Interp *) slaveInterp)->interpInfo)->slave; /* * Unlink the slave from its master interpreter. */ Tcl_DeleteHashEntry(slavePtr->slaveEntryPtr); /* * Set to NULL so that when the InterpInfo is cleaned up in the slave it * does not try to delete the command causing all sorts of grief. See * SlaveRecordDeleteProc(). */ slavePtr->interpCmd = NULL; if (slavePtr->slaveInterp != NULL) { Tcl_DeleteInterp(slavePtr->slaveInterp); } }  /* *---------------------------------------------------------------------- * * SlaveEval -- * * Helper function to evaluate a command in a slave interpreter. * * Results: * A standard Tcl result. * * Side effects: * Whatever the command does. * *---------------------------------------------------------------------- */ static int SlaveEval( Tcl_Interp *interp, /* Interp for error return. */ Tcl_Interp *slaveInterp, /* The slave interpreter in which command * will be evaluated. */ int objc, /* Number of arguments. */ Tcl_Obj *const objv[]) /* Argument objects. */ { int result; Tcl_Obj *objPtr; Tcl_Preserve(slaveInterp); Tcl_AllowExceptions(slaveInterp); if (objc == 1) { /* * TIP #280: Make invoker available to eval'd script. */ Interp *iPtr = (Interp *) interp; result = TclEvalObjEx(slaveInterp, objv[0], 0, iPtr->cmdFramePtr, 0); } else { objPtr = Tcl_ConcatObj(objc, objv); Tcl_IncrRefCount(objPtr); result = Tcl_EvalObjEx(slaveInterp, objPtr, 0); Tcl_DecrRefCount(objPtr); } TclTransferResult(slaveInterp, result, interp); Tcl_Release(slaveInterp); return result; }  /* *---------------------------------------------------------------------- * * SlaveExpose -- * * Helper function to expose a command in a slave interpreter. * * Results: * A standard Tcl result. * * Side effects: * After this call scripts in the slave will be able to invoke the newly * exposed command. * *---------------------------------------------------------------------- */ static int SlaveExpose( Tcl_Interp *interp, /* Interp for error return. */ Tcl_Interp *slaveInterp, /* Interp in which command will be exposed. */ int objc, /* Number of arguments. */ Tcl_Obj *const objv[]) /* Argument strings. */ { char *name; if (Tcl_IsSafe(interp)) { Tcl_SetObjResult(interp, Tcl_NewStringObj( "permission denied: safe interpreter cannot expose commands", -1)); return TCL_ERROR; } name = TclGetString(objv[(objc == 1) ? 0 : 1]); if (Tcl_ExposeCommand(slaveInterp, TclGetString(objv[0]), name) != TCL_OK) { TclTransferResult(slaveInterp, TCL_ERROR, interp); return TCL_ERROR; } return TCL_OK; }  /* *---------------------------------------------------------------------- * * SlaveRecursionLimit -- * * Helper function to set/query the Recursion limit of an interp * * Results: * A standard Tcl result. * * Side effects: * When (objc == 1), slaveInterp will be set to a new recursion limit of * objv[0]. * *---------------------------------------------------------------------- */ static int SlaveRecursionLimit( Tcl_Interp *interp, /* Interp for error return. */ Tcl_Interp *slaveInterp, /* Interp in which limit is set/queried. */ int objc, /* Set or Query. */ Tcl_Obj *const objv[]) /* Argument strings. */ { Interp *iPtr; int limit; if (objc) { if (Tcl_IsSafe(interp)) { Tcl_AppendResult(interp, "permission denied: " "safe interpreters cannot change recursion limit", NULL); return TCL_ERROR; } if (TclGetIntFromObj(interp, objv[0], &limit) == TCL_ERROR) { return TCL_ERROR; } if (limit <= 0) { Tcl_SetObjResult(interp, Tcl_NewStringObj( "recursion limit must be > 0", -1)); return TCL_ERROR; } Tcl_SetRecursionLimit(slaveInterp, limit); iPtr = (Interp *) slaveInterp; if (interp == slaveInterp && iPtr->numLevels > limit) { Tcl_SetObjResult(interp, Tcl_NewStringObj( "falling back due to new recursion limit", -1)); return TCL_ERROR; } Tcl_SetObjResult(interp, objv[0]); return TCL_OK; } else { limit = Tcl_SetRecursionLimit(slaveInterp, 0); Tcl_SetObjResult(interp, Tcl_NewIntObj(limit)); return TCL_OK; } }  /* *---------------------------------------------------------------------- * * SlaveHide -- * * Helper function to hide a command in a slave interpreter. * * Results: * A standard Tcl result. * * Side effects: * After this call scripts in the slave will no longer be able to invoke * the named command. * *---------------------------------------------------------------------- */ static int SlaveHide( Tcl_Interp *interp, /* Interp for error return. */ Tcl_Interp *slaveInterp, /* Interp in which command will be exposed. */ int objc, /* Number of arguments. */ Tcl_Obj *const objv[]) /* Argument strings. */ { char *name; if (Tcl_IsSafe(interp)) { Tcl_SetObjResult(interp, Tcl_NewStringObj( "permission denied: safe interpreter cannot hide commands", -1)); return TCL_ERROR; } name = TclGetString(objv[(objc == 1) ? 0 : 1]); if (Tcl_HideCommand(slaveInterp, TclGetString(objv[0]), name) != TCL_OK) { TclTransferResult(slaveInterp, TCL_ERROR, interp); return TCL_ERROR; } return TCL_OK; }  /* *---------------------------------------------------------------------- * * SlaveHidden -- * * Helper function to compute list of hidden commands in a slave * interpreter. * * Results: * A standard Tcl result. * * Side effects: * None. * *---------------------------------------------------------------------- */ static int SlaveHidden( Tcl_Interp *interp, /* Interp for data return. */ Tcl_Interp *slaveInterp) /* Interp whose hidden commands to query. */ { Tcl_Obj *listObjPtr = Tcl_NewObj(); /* Local object pointer. */ Tcl_HashTable *hTblPtr; /* For local searches. */ Tcl_HashEntry *hPtr; /* For local searches. */ Tcl_HashSearch hSearch; /* For local searches. */ hTblPtr = ((Interp *) slaveInterp)->hiddenCmdTablePtr; if (hTblPtr != NULL) { for (hPtr = Tcl_FirstHashEntry(hTblPtr, &hSearch); hPtr != NULL; hPtr = Tcl_NextHashEntry(&hSearch)) { Tcl_ListObjAppendElement(NULL, listObjPtr, Tcl_NewStringObj(Tcl_GetHashKey(hTblPtr, hPtr), -1)); } } Tcl_SetObjResult(interp, listObjPtr); return TCL_OK; }  /* *---------------------------------------------------------------------- * * SlaveInvokeHidden -- * * Helper function to invoke a hidden command in a slave interpreter. * * Results: * A standard Tcl result. * * Side effects: * Whatever the hidden command does. * *---------------------------------------------------------------------- */ static int SlaveInvokeHidden( Tcl_Interp *interp, /* Interp for error return. */ Tcl_Interp *slaveInterp, /* The slave interpreter in which command will * be invoked. */ const char *namespaceName, /* The namespace to use, if any. */ int objc, /* Number of arguments. */ Tcl_Obj *const objv[]) /* Argument objects. */ { int result; if (Tcl_IsSafe(interp)) { Tcl_SetObjResult(interp, Tcl_NewStringObj( "not allowed to invoke hidden commands from safe interpreter", -1)); return TCL_ERROR; } Tcl_Preserve(slaveInterp); Tcl_AllowExceptions(slaveInterp); if (namespaceName == NULL) { result = TclObjInvoke(slaveInterp, objc, objv, TCL_INVOKE_HIDDEN); } else { Namespace *nsPtr, *dummy1, *dummy2; const char *tail; result = TclGetNamespaceForQualName(slaveInterp, namespaceName, NULL, TCL_FIND_ONLY_NS | TCL_GLOBAL_ONLY | TCL_LEAVE_ERR_MSG | TCL_CREATE_NS_IF_UNKNOWN, &nsPtr, &dummy1, &dummy2, &tail); if (result == TCL_OK) { result = TclObjInvokeNamespace(slaveInterp, objc, objv, (Tcl_Namespace *)nsPtr, TCL_INVOKE_HIDDEN); } } TclTransferResult(slaveInterp, result, interp); Tcl_Release(slaveInterp); return result; }  /* *---------------------------------------------------------------------- * * SlaveMarkTrusted -- * * Helper function to mark a slave interpreter as trusted (unsafe). * * Results: * A standard Tcl result. * * Side effects: * After this call the hard-wired security checks in the core no longer * prevent the slave from performing certain operations. * *---------------------------------------------------------------------- */ static int SlaveMarkTrusted( Tcl_Interp *interp, /* Interp for error return. */ Tcl_Interp *slaveInterp) /* The slave interpreter which will be marked * trusted. */ { if (Tcl_IsSafe(interp)) { Tcl_SetObjResult(interp, Tcl_NewStringObj( "permission denied: safe interpreter cannot mark trusted", -1)); return TCL_ERROR; } ((Interp *) slaveInterp)->flags &= ~SAFE_INTERP; return TCL_OK; }  /* *---------------------------------------------------------------------- * * Tcl_IsSafe -- * * Determines whether an interpreter is safe * * Results: * 1 if it is safe, 0 if it is not. * * Side effects: * None. * *---------------------------------------------------------------------- */ int Tcl_IsSafe( Tcl_Interp *interp) /* Is this interpreter "safe" ? */ { Interp *iPtr = (Interp *) interp; if (iPtr == NULL) { return 0; } return (iPtr->flags & SAFE_INTERP) ? 1 : 0; }  /* *---------------------------------------------------------------------- * * Tcl_MakeSafe -- * * Makes its argument interpreter contain only functionality that is * defined to be part of Safe Tcl. Unsafe commands are hidden, the env * array is unset, and the standard channels are removed. * * Results: * None. * * Side effects: * Hides commands in its argument interpreter, and removes settings and * channels. * *---------------------------------------------------------------------- */ int Tcl_MakeSafe( Tcl_Interp *interp) /* Interpreter to be made safe. */ { Tcl_Channel chan; /* Channel to remove from safe interpreter. */ Interp *iPtr = (Interp *) interp; TclHideUnsafeCommands(interp); iPtr->flags |= SAFE_INTERP; /* * Unsetting variables : (which should not have been set in the first * place, but...) */ /* * No env array in a safe slave. */ Tcl_UnsetVar(interp, "env", TCL_GLOBAL_ONLY); /* * Remove unsafe parts of tcl_platform */ Tcl_UnsetVar2(interp, "tcl_platform", "os", TCL_GLOBAL_ONLY); Tcl_UnsetVar2(interp, "tcl_platform", "osVersion", TCL_GLOBAL_ONLY); Tcl_UnsetVar2(interp, "tcl_platform", "machine", TCL_GLOBAL_ONLY); Tcl_UnsetVar2(interp, "tcl_platform", "user", TCL_GLOBAL_ONLY); /* * Unset path informations variables (the only one remaining is [info * nameofexecutable]) */ Tcl_UnsetVar(interp, "tclDefaultLibrary", TCL_GLOBAL_ONLY); Tcl_UnsetVar(interp, "tcl_library", TCL_GLOBAL_ONLY); Tcl_UnsetVar(interp, "tcl_pkgPath", TCL_GLOBAL_ONLY); /* * Remove the standard channels from the interpreter; safe interpreters do * not ordinarily have access to stdin, stdout and stderr. * * NOTE: These channels are not added to the interpreter by the * Tcl_CreateInterp call, but may be added later, by another I/O * operation. We want to ensure that the interpreter does not have these * channels even if it is being made safe after being used for some time.. */ chan = Tcl_GetStdChannel(TCL_STDIN); if (chan != NULL) { Tcl_UnregisterChannel(interp, chan); } chan = Tcl_GetStdChannel(TCL_STDOUT); if (chan != NULL) { Tcl_UnregisterChannel(interp, chan); } chan = Tcl_GetStdChannel(TCL_STDERR); if (chan != NULL) { Tcl_UnregisterChannel(interp, chan); } return TCL_OK; }  /* *---------------------------------------------------------------------- * * Tcl_LimitExceeded -- * * Tests whether any limit has been exceeded in the given interpreter * (i.e. whether the interpreter is currently unable to process further * scripts). * * Results: * A boolean value. * * Side effects: * None. * * Notes: * If you change this function, you MUST also update TclLimitExceeded() in * tclInt.h. *---------------------------------------------------------------------- */ int Tcl_LimitExceeded( Tcl_Interp *interp) { register Interp *iPtr = (Interp *) interp; return iPtr->limit.exceeded != 0; }  /* *---------------------------------------------------------------------- * * Tcl_LimitReady -- * * Find out whether any limit has been set on the interpreter, and if so * check whether the granularity of that limit is such that the full * limit check should be carried out. * * Results: * A boolean value that indicates whether to call Tcl_LimitCheck. * * Side effects: * Increments the limit granularity counter. * * Notes: * If you change this function, you MUST also update TclLimitReady() in * tclInt.h. * *---------------------------------------------------------------------- */ int Tcl_LimitReady( Tcl_Interp *interp) { register Interp *iPtr = (Interp *) interp; if (iPtr->limit.active != 0) { register int ticker = ++iPtr->limit.granularityTicker; if ((iPtr->limit.active & TCL_LIMIT_COMMANDS) && ((iPtr->limit.cmdGranularity == 1) || (ticker % iPtr->limit.cmdGranularity == 0))) { return 1; } if ((iPtr->limit.active & TCL_LIMIT_TIME) && ((iPtr->limit.timeGranularity == 1) || (ticker % iPtr->limit.timeGranularity == 0))) { return 1; } } return 0; }  /* *---------------------------------------------------------------------- * * Tcl_LimitCheck -- * * Check all currently set limits in the interpreter (where permitted by * granularity). If a limit is exceeded, call its callbacks and, if the * limit is still exceeded after the callbacks have run, make the * interpreter generate an error that cannot be caught within the limited * interpreter. * * Results: * A Tcl result value (TCL_OK if no limit is exceeded, and TCL_ERROR if a * limit has been exceeded). * * Side effects: * May invoke system calls. May invoke other interpreters. May be * reentrant. May put the interpreter into a state where it can no longer * execute commands without outside intervention. * *---------------------------------------------------------------------- */ int Tcl_LimitCheck( Tcl_Interp *interp) { Interp *iPtr = (Interp *) interp; register int ticker = iPtr->limit.granularityTicker; if (Tcl_InterpDeleted(interp)) { return TCL_OK; } if ((iPtr->limit.active & TCL_LIMIT_COMMANDS) && ((iPtr->limit.cmdGranularity == 1) || (ticker % iPtr->limit.cmdGranularity == 0)) && (iPtr->limit.cmdCount < iPtr->cmdCount)) { iPtr->limit.exceeded |= TCL_LIMIT_COMMANDS; Tcl_Preserve(interp); RunLimitHandlers(iPtr->limit.cmdHandlers, interp); if (iPtr->limit.cmdCount >= iPtr->cmdCount) { iPtr->limit.exceeded &= ~TCL_LIMIT_COMMANDS; } else if (iPtr->limit.exceeded & TCL_LIMIT_COMMANDS) { Tcl_ResetResult(interp); Tcl_AppendResult(interp, "command count limit exceeded", NULL); Tcl_Release(interp); return TCL_ERROR; } Tcl_Release(interp); } if ((iPtr->limit.active & TCL_LIMIT_TIME) && ((iPtr->limit.timeGranularity == 1) || (ticker % iPtr->limit.timeGranularity == 0))) { Tcl_Time now; Tcl_GetTime(&now); if (iPtr->limit.time.sec < now.sec || (iPtr->limit.time.sec == now.sec && iPtr->limit.time.usec < now.usec)) { iPtr->limit.exceeded |= TCL_LIMIT_TIME; Tcl_Preserve(interp); RunLimitHandlers(iPtr->limit.timeHandlers, interp); if (iPtr->limit.time.sec > now.sec || (iPtr->limit.time.sec == now.sec && iPtr->limit.time.usec >= now.usec)) { iPtr->limit.exceeded &= ~TCL_LIMIT_TIME; } else if (iPtr->limit.exceeded & TCL_LIMIT_TIME) { Tcl_ResetResult(interp); Tcl_AppendResult(interp, "time limit exceeded", NULL); Tcl_Release(interp); return TCL_ERROR; } Tcl_Release(interp); } } return TCL_OK; }  /* *---------------------------------------------------------------------- * * RunLimitHandlers -- * * Invoke all the limit handlers in a list (for a particular limit). * Note that no particular limit handler callback will be invoked * reentrantly. * * Results: * None. * * Side effects: * Depends on the limit handlers. * *---------------------------------------------------------------------- */ static void RunLimitHandlers( LimitHandler *handlerPtr, Tcl_Interp *interp) { LimitHandler *nextPtr; for (; handlerPtr!=NULL ; handlerPtr=nextPtr) { if (handlerPtr->flags & (LIMIT_HANDLER_DELETED|LIMIT_HANDLER_ACTIVE)) { /* * Reentrant call or something seriously strange in the delete * code. */ nextPtr = handlerPtr->nextPtr; continue; } /* * Set the ACTIVE flag while running the limit handler itself so we * cannot reentrantly call this handler and know to use the alternate * method of deletion if necessary. */ handlerPtr->flags |= LIMIT_HANDLER_ACTIVE; (handlerPtr->handlerProc)(handlerPtr->clientData, interp); handlerPtr->flags &= ~LIMIT_HANDLER_ACTIVE; /* * Rediscover this value; it might have changed during the processing * of a limit handler. We have to record it here because we might * delete the structure below, and reading a value out of a deleted * structure is unsafe (even if actually legal with some * malloc()/free() implementations.) */ nextPtr = handlerPtr->nextPtr; /* * If we deleted the current handler while we were executing it, we * will have spliced it out of the list and set the * LIMIT_HANDLER_DELETED flag. */ if (handlerPtr->flags & LIMIT_HANDLER_DELETED) { if (handlerPtr->deleteProc != NULL) { (handlerPtr->deleteProc)(handlerPtr->clientData); } ckfree((char *) handlerPtr); } } }  /* *---------------------------------------------------------------------- * * Tcl_LimitAddHandler -- * * Add a callback handler for a particular resource limit. * * Results: * None. * * Side effects: * Extends the internal linked list of handlers for a limit. * *---------------------------------------------------------------------- */ void Tcl_LimitAddHandler( Tcl_Interp *interp, int type, Tcl_LimitHandlerProc *handlerProc, ClientData clientData, Tcl_LimitHandlerDeleteProc *deleteProc) { Interp *iPtr = (Interp *) interp; LimitHandler *handlerPtr; /* * Convert everything into a real deletion callback. */ if (deleteProc == (Tcl_LimitHandlerDeleteProc *) TCL_DYNAMIC) { deleteProc = (Tcl_LimitHandlerDeleteProc *) Tcl_Free; } if (deleteProc == (Tcl_LimitHandlerDeleteProc *) TCL_STATIC) { deleteProc = NULL; } /* * Allocate a handler record. */ handlerPtr = (LimitHandler *) ckalloc(sizeof(LimitHandler)); handlerPtr->flags = 0; handlerPtr->handlerProc = handlerProc; handlerPtr->clientData = clientData; handlerPtr->deleteProc = deleteProc; handlerPtr->prevPtr = NULL; /* * Prepend onto the front of the correct linked list. */ switch (type) { case TCL_LIMIT_COMMANDS: handlerPtr->nextPtr = iPtr->limit.cmdHandlers; if (handlerPtr->nextPtr != NULL) { handlerPtr->nextPtr->prevPtr = handlerPtr; } iPtr->limit.cmdHandlers = handlerPtr; return; case TCL_LIMIT_TIME: handlerPtr->nextPtr = iPtr->limit.timeHandlers; if (handlerPtr->nextPtr != NULL) { handlerPtr->nextPtr->prevPtr = handlerPtr; } iPtr->limit.timeHandlers = handlerPtr; return; } Tcl_Panic("unknown type of resource limit"); }  /* *---------------------------------------------------------------------- * * Tcl_LimitRemoveHandler -- * * Remove a callback handler for a particular resource limit. * * Results: * None. * * Side effects: * The handler is spliced out of the internal linked list for the limit, * and if not currently being invoked, deleted. Otherwise it is just * marked for deletion and removed when the limit handler has finished * executing. * *---------------------------------------------------------------------- */ void Tcl_LimitRemoveHandler( Tcl_Interp *interp, int type, Tcl_LimitHandlerProc *handlerProc, ClientData clientData) { Interp *iPtr = (Interp *) interp; LimitHandler *handlerPtr; switch (type) { case TCL_LIMIT_COMMANDS: handlerPtr = iPtr->limit.cmdHandlers; break; case TCL_LIMIT_TIME: handlerPtr = iPtr->limit.timeHandlers; break; default: Tcl_Panic("unknown type of resource limit"); return; } for (; handlerPtr!=NULL ; handlerPtr=handlerPtr->nextPtr) { if ((handlerPtr->handlerProc != handlerProc) || (handlerPtr->clientData != clientData)) { continue; } /* * We've found the handler to delete; mark it as doomed if not already * so marked (which shouldn't actually happen). */ if (handlerPtr->flags & LIMIT_HANDLER_DELETED) { return; } handlerPtr->flags |= LIMIT_HANDLER_DELETED; /* * Splice the handler out of the doubly-linked list. */ if (handlerPtr->prevPtr == NULL) { switch (type) { case TCL_LIMIT_COMMANDS: iPtr->limit.cmdHandlers = handlerPtr->nextPtr; break; case TCL_LIMIT_TIME: iPtr->limit.timeHandlers = handlerPtr->nextPtr; break; } } else { handlerPtr->prevPtr->nextPtr = handlerPtr->nextPtr; } if (handlerPtr->nextPtr != NULL) { handlerPtr->nextPtr->prevPtr = handlerPtr->prevPtr; } /* * If nothing is currently executing the handler, delete its client * data and the overall handler structure now. Otherwise it will all * go away when the handler returns. */ if (!(handlerPtr->flags & LIMIT_HANDLER_ACTIVE)) { if (handlerPtr->deleteProc != NULL) { (handlerPtr->deleteProc)(handlerPtr->clientData); } ckfree((char *) handlerPtr); } return; } }  /* *---------------------------------------------------------------------- * * TclLimitRemoveAllHandlers -- * * Remove all limit callback handlers for an interpreter. This is invoked * as part of deleting the interpreter. * * Results: * None. * * Side effects: * Limit handlers are deleted or marked for deletion (as with * Tcl_LimitRemoveHandler). * *---------------------------------------------------------------------- */ void TclLimitRemoveAllHandlers( Tcl_Interp *interp) { Interp *iPtr = (Interp *) interp; LimitHandler *handlerPtr, *nextHandlerPtr; /* * Delete all command-limit handlers. */ for (handlerPtr=iPtr->limit.cmdHandlers, iPtr->limit.cmdHandlers=NULL; handlerPtr!=NULL; handlerPtr=nextHandlerPtr) { nextHandlerPtr = handlerPtr->nextPtr; /* * Do not delete here if it has already been marked for deletion. */ if (handlerPtr->flags & LIMIT_HANDLER_DELETED) { continue; } handlerPtr->flags |= LIMIT_HANDLER_DELETED; handlerPtr->prevPtr = NULL; handlerPtr->nextPtr = NULL; /* * If nothing is currently executing the handler, delete its client * data and the overall handler structure now. Otherwise it will all * go away when the handler returns. */ if (!(handlerPtr->flags & LIMIT_HANDLER_ACTIVE)) { if (handlerPtr->deleteProc != NULL) { (handlerPtr->deleteProc)(handlerPtr->clientData); } ckfree((char *) handlerPtr); } } /* * Delete all time-limit handlers. */ for (handlerPtr=iPtr->limit.timeHandlers, iPtr->limit.timeHandlers=NULL; handlerPtr!=NULL; handlerPtr=nextHandlerPtr) { nextHandlerPtr = handlerPtr->nextPtr; /* * Do not delete here if it has already been marked for deletion. */ if (handlerPtr->flags & LIMIT_HANDLER_DELETED) { continue; } handlerPtr->flags |= LIMIT_HANDLER_DELETED; handlerPtr->prevPtr = NULL; handlerPtr->nextPtr = NULL; /* * If nothing is currently executing the handler, delete its client * data and the overall handler structure now. Otherwise it will all * go away when the handler returns. */ if (!(handlerPtr->flags & LIMIT_HANDLER_ACTIVE)) { if (handlerPtr->deleteProc != NULL) { (handlerPtr->deleteProc)(handlerPtr->clientData); } ckfree((char *) handlerPtr); } } /* * Delete the timer callback that is used to trap limits that occur in * [vwait]s... */ if (iPtr->limit.timeEvent != NULL) { Tcl_DeleteTimerHandler(iPtr->limit.timeEvent); iPtr->limit.timeEvent = NULL; } }  /* *---------------------------------------------------------------------- * * Tcl_LimitTypeEnabled -- * * Check whether a particular limit has been enabled for an interpreter. * * Results: * A boolean value. * * Side effects: * None. * *---------------------------------------------------------------------- */ int Tcl_LimitTypeEnabled( Tcl_Interp *interp, int type) { Interp *iPtr = (Interp *) interp; return (iPtr->limit.active & type) != 0; }  /* *---------------------------------------------------------------------- * * Tcl_LimitTypeExceeded -- * * Check whether a particular limit has been exceeded for an interpreter. * * Results: * A boolean value (note that Tcl_LimitExceeded will always return * non-zero when this function returns non-zero). * * Side effects: * None. * *---------------------------------------------------------------------- */ int Tcl_LimitTypeExceeded( Tcl_Interp *interp, int type) { Interp *iPtr = (Interp *) interp; return (iPtr->limit.exceeded & type) != 0; }  /* *---------------------------------------------------------------------- * * Tcl_LimitTypeSet -- * * Enable a particular limit for an interpreter. * * Results: * None. * * Side effects: * The limit is turned on and will be checked in future at an interval * determined by the frequency of calling of Tcl_LimitReady and the * granularity of the limit in question. * *---------------------------------------------------------------------- */ void Tcl_LimitTypeSet( Tcl_Interp *interp, int type) { Interp *iPtr = (Interp *) interp; iPtr->limit.active |= type; }  /* *---------------------------------------------------------------------- * * Tcl_LimitTypeReset -- * * Disable a particular limit for an interpreter. * * Results: * None. * * Side effects: * The limit is disabled. If the limit was exceeded when this function * was called, the limit will no longer be exceeded afterwards and the * interpreter will be free to execute further scripts (assuming it isn't * also deleted, of course). * *---------------------------------------------------------------------- */ void Tcl_LimitTypeReset( Tcl_Interp *interp, int type) { Interp *iPtr = (Interp *) interp; iPtr->limit.active &= ~type; iPtr->limit.exceeded &= ~type; }  /* *---------------------------------------------------------------------- * * Tcl_LimitSetCommands -- * * Set the command limit for an interpreter. * * Results: * None. * * Side effects: * Also resets whether the command limit was exceeded. This might permit * a small amount of further execution in the interpreter even if the * limit itself is theoretically exceeded. * *---------------------------------------------------------------------- */ void Tcl_LimitSetCommands( Tcl_Interp *interp, int commandLimit) { Interp *iPtr = (Interp *) interp; iPtr->limit.cmdCount = commandLimit; iPtr->limit.exceeded &= ~TCL_LIMIT_COMMANDS; }  /* *---------------------------------------------------------------------- * * Tcl_LimitGetCommands -- * * Get the number of commands that may be executed in the interpreter * before the command-limit is reached. * * Results: * An upper bound on the number of commands. * * Side effects: * None. * *---------------------------------------------------------------------- */ int Tcl_LimitGetCommands( Tcl_Interp *interp) { Interp *iPtr = (Interp *) interp; return iPtr->limit.cmdCount; }  /* *---------------------------------------------------------------------- * * Tcl_LimitSetTime -- * * Set the time limit for an interpreter by copying it from the value * pointed to by the timeLimitPtr argument. * * Results: * None. * * Side effects: * Also resets whether the time limit was exceeded. This might permit a * small amount of further execution in the interpreter even if the limit * itself is theoretically exceeded. * *---------------------------------------------------------------------- */ void Tcl_LimitSetTime( Tcl_Interp *interp, Tcl_Time *timeLimitPtr) { Interp *iPtr = (Interp *) interp; Tcl_Time nextMoment; memcpy(&iPtr->limit.time, timeLimitPtr, sizeof(Tcl_Time)); if (iPtr->limit.timeEvent != NULL) { Tcl_DeleteTimerHandler(iPtr->limit.timeEvent); } nextMoment.sec = timeLimitPtr->sec; nextMoment.usec = timeLimitPtr->usec+10; if (nextMoment.usec >= 1000000) { nextMoment.sec++; nextMoment.usec -= 1000000; } iPtr->limit.timeEvent = TclCreateAbsoluteTimerHandler(&nextMoment, TimeLimitCallback, interp); iPtr->limit.exceeded &= ~TCL_LIMIT_TIME; }  /* *---------------------------------------------------------------------- * * TimeLimitCallback -- * * Callback that allows time limits to be enforced even when doing a * blocking wait for events. * * Results: * None. * * Side effects: * May put the interpreter into a state where it can no longer execute * commands. May make callbacks into other interpreters. * *---------------------------------------------------------------------- */ static void TimeLimitCallback( ClientData clientData) { Tcl_Interp *interp = clientData; int code; Tcl_Preserve(interp); ((Interp *)interp)->limit.timeEvent = NULL; code = Tcl_LimitCheck(interp); if (code != TCL_OK) { Tcl_AddErrorInfo(interp, "\n (while waiting for event)"); TclBackgroundException(interp, code); } Tcl_Release(interp); }  /* *---------------------------------------------------------------------- * * Tcl_LimitGetTime -- * * Get the current time limit. * * Results: * The time limit (by it being copied into the variable pointed to by the * timeLimitPtr). * * Side effects: * None. * *---------------------------------------------------------------------- */ void Tcl_LimitGetTime( Tcl_Interp *interp, Tcl_Time *timeLimitPtr) { Interp *iPtr = (Interp *) interp; memcpy(timeLimitPtr, &iPtr->limit.time, sizeof(Tcl_Time)); }  /* *---------------------------------------------------------------------- * * Tcl_LimitSetGranularity -- * * Set the granularity divisor (which must be positive) for a particular * limit. * * Results: * None. * * Side effects: * The granularity is updated. * *---------------------------------------------------------------------- */ void Tcl_LimitSetGranularity( Tcl_Interp *interp, int type, int granularity) { Interp *iPtr = (Interp *) interp; if (granularity < 1) { Tcl_Panic("limit granularity must be positive"); } switch (type) { case TCL_LIMIT_COMMANDS: iPtr->limit.cmdGranularity = granularity; return; case TCL_LIMIT_TIME: iPtr->limit.timeGranularity = granularity; return; } Tcl_Panic("unknown type of resource limit"); }  /* *---------------------------------------------------------------------- * * Tcl_LimitGetGranularity -- * * Get the granularity divisor for a particular limit. * * Results: * The granularity divisor for the given limit. * * Side effects: * None. * *---------------------------------------------------------------------- */ int Tcl_LimitGetGranularity( Tcl_Interp *interp, int type) { Interp *iPtr = (Interp *) interp; switch (type) { case TCL_LIMIT_COMMANDS: return iPtr->limit.cmdGranularity; case TCL_LIMIT_TIME: return iPtr->limit.timeGranularity; } Tcl_Panic("unknown type of resource limit"); return -1; /* NOT REACHED */ }  /* *---------------------------------------------------------------------- * * DeleteScriptLimitCallback -- * * Callback for when a script limit (a limit callback implemented as a * Tcl script in a master interpreter, as set up from Tcl) is deleted. * * Results: * None. * * Side effects: * The reference to the script callback from the controlling interpreter * is removed. * *---------------------------------------------------------------------- */ static void DeleteScriptLimitCallback( ClientData clientData) { ScriptLimitCallback *limitCBPtr = clientData; Tcl_DecrRefCount(limitCBPtr->scriptObj); if (limitCBPtr->entryPtr != NULL) { Tcl_DeleteHashEntry(limitCBPtr->entryPtr); } ckfree((char *) limitCBPtr); }  /* *---------------------------------------------------------------------- * * CallScriptLimitCallback -- * * Invoke a script limit callback. Used to implement limit callbacks set * at the Tcl level on child interpreters. * * Results: * None. * * Side effects: * Depends on the callback script. Errors are reported as background * errors. * *---------------------------------------------------------------------- */ static void CallScriptLimitCallback( ClientData clientData, Tcl_Interp *interp) /* Interpreter which failed the limit */ { ScriptLimitCallback *limitCBPtr = clientData; int code; if (Tcl_InterpDeleted(limitCBPtr->interp)) { return; } Tcl_Preserve(limitCBPtr->interp); code = Tcl_EvalObjEx(limitCBPtr->interp, limitCBPtr->scriptObj, TCL_EVAL_GLOBAL); if (code != TCL_OK && !Tcl_InterpDeleted(limitCBPtr->interp)) { TclBackgroundException(limitCBPtr->interp, code); } Tcl_Release(limitCBPtr->interp); }  /* *---------------------------------------------------------------------- * * SetScriptLimitCallback -- * * Install (or remove, if scriptObj is NULL) a limit callback script that * is called when the target interpreter exceeds the type of limit * specified. Each interpreter may only have one callback set on another * interpreter through this mechanism (though as many interpreters may be * limited as the programmer chooses overall). * * Results: * None. * * Side effects: * A limit callback implemented as an invokation of a Tcl script in * another interpreter is either installed or removed. * *---------------------------------------------------------------------- */ static void SetScriptLimitCallback( Tcl_Interp *interp, int type, Tcl_Interp *targetInterp, Tcl_Obj *scriptObj) { ScriptLimitCallback *limitCBPtr; Tcl_HashEntry *hashPtr; int isNew; ScriptLimitCallbackKey key; Interp *iPtr = (Interp *) interp; if (interp == targetInterp) { Tcl_Panic("installing limit callback to the limited interpreter"); } key.interp = targetInterp; key.type = type; if (scriptObj == NULL) { hashPtr = Tcl_FindHashEntry(&iPtr->limit.callbacks, (char *) &key); if (hashPtr != NULL) { Tcl_LimitRemoveHandler(targetInterp, type, CallScriptLimitCallback, Tcl_GetHashValue(hashPtr)); } return; } hashPtr = Tcl_CreateHashEntry(&iPtr->limit.callbacks, (char *) &key, &isNew); if (!isNew) { limitCBPtr = Tcl_GetHashValue(hashPtr); limitCBPtr->entryPtr = NULL; Tcl_LimitRemoveHandler(targetInterp, type, CallScriptLimitCallback, limitCBPtr); } limitCBPtr = (ScriptLimitCallback *) ckalloc(sizeof(ScriptLimitCallback)); limitCBPtr->interp = interp; limitCBPtr->scriptObj = scriptObj; limitCBPtr->entryPtr = hashPtr; limitCBPtr->type = type; Tcl_IncrRefCount(scriptObj); Tcl_LimitAddHandler(targetInterp, type, CallScriptLimitCallback, limitCBPtr, DeleteScriptLimitCallback); Tcl_SetHashValue(hashPtr, limitCBPtr); }  /* *---------------------------------------------------------------------- * * TclRemoveScriptLimitCallbacks -- * * Remove all script-implemented limit callbacks that make calls back * into the given interpreter. This invoked as part of deleting an * interpreter. * * Results: * None. * * Side effects: * The script limit callbacks are removed or marked for later removal. * *---------------------------------------------------------------------- */ void TclRemoveScriptLimitCallbacks( Tcl_Interp *interp) { Interp *iPtr = (Interp *) interp; Tcl_HashEntry *hashPtr; Tcl_HashSearch search; ScriptLimitCallbackKey *keyPtr; hashPtr = Tcl_FirstHashEntry(&iPtr->limit.callbacks, &search); while (hashPtr != NULL) { keyPtr = (ScriptLimitCallbackKey *) Tcl_GetHashKey(&iPtr->limit.callbacks, hashPtr); Tcl_LimitRemoveHandler(keyPtr->interp, keyPtr->type, CallScriptLimitCallback, Tcl_GetHashValue(hashPtr)); hashPtr = Tcl_NextHashEntry(&search); } Tcl_DeleteHashTable(&iPtr->limit.callbacks); }  /* *---------------------------------------------------------------------- * * TclInitLimitSupport -- * * Initialise all the parts of the interpreter relating to resource limit * management. This allows an interpreter to both have limits set upon * itself and set limits upon other interpreters. * * Results: * None. * * Side effects: * The resource limit subsystem is initialised for the interpreter. * *---------------------------------------------------------------------- */ void TclInitLimitSupport( Tcl_Interp *interp) { Interp *iPtr = (Interp *) interp; iPtr->limit.active = 0; iPtr->limit.granularityTicker = 0; iPtr->limit.exceeded = 0; iPtr->limit.cmdCount = 0; iPtr->limit.cmdHandlers = NULL; iPtr->limit.cmdGranularity = 1; memset(&iPtr->limit.time, 0, sizeof(Tcl_Time)); iPtr->limit.timeHandlers = NULL; iPtr->limit.timeEvent = NULL; iPtr->limit.timeGranularity = 10; Tcl_InitHashTable(&iPtr->limit.callbacks, sizeof(ScriptLimitCallbackKey)/sizeof(int)); }  /* *---------------------------------------------------------------------- * * InheritLimitsFromMaster -- * * Derive the interpreter limit configuration for a slave interpreter * from the limit config for the master. * * Results: * None. * * Side effects: * The slave interpreter limits are set so that if the master has a * limit, it may not exceed it by handing off work to slave interpreters. * Note that this does not transfer limit callbacks from the master to * the slave. * *---------------------------------------------------------------------- */ static void InheritLimitsFromMaster( Tcl_Interp *slaveInterp, Tcl_Interp *masterInterp) { Interp *slavePtr = (Interp *) slaveInterp; Interp *masterPtr = (Interp *) masterInterp; if (masterPtr->limit.active & TCL_LIMIT_COMMANDS) { slavePtr->limit.active |= TCL_LIMIT_COMMANDS; slavePtr->limit.cmdCount = 0; slavePtr->limit.cmdGranularity = masterPtr->limit.cmdGranularity; } if (masterPtr->limit.active & TCL_LIMIT_TIME) { slavePtr->limit.active |= TCL_LIMIT_TIME; memcpy(&slavePtr->limit.time, &masterPtr->limit.time, sizeof(Tcl_Time)); slavePtr->limit.timeGranularity = masterPtr->limit.timeGranularity; } }  /* *---------------------------------------------------------------------- * * SlaveCommandLimitCmd -- * * Implementation of the [interp limit $i commands] and [$i limit * commands] subcommands. See the interp manual page for a full * description. * * Results: * A standard Tcl result. * * Side effects: * Depends on the arguments. * *---------------------------------------------------------------------- */ static int SlaveCommandLimitCmd( Tcl_Interp *interp, /* Current interpreter. */ Tcl_Interp *slaveInterp, /* Interpreter being adjusted. */ int consumedObjc, /* Number of args already parsed. */ int objc, /* Total number of arguments. */ Tcl_Obj *const objv[]) /* Argument objects. */ { static const char *options[] = { "-command", "-granularity", "-value", NULL }; enum Options { OPT_CMD, OPT_GRAN, OPT_VAL }; Interp *iPtr = (Interp *) interp; int index; ScriptLimitCallbackKey key; ScriptLimitCallback *limitCBPtr; Tcl_HashEntry *hPtr; if (objc == consumedObjc) { Tcl_Obj *dictPtr; TclNewObj(dictPtr); key.interp = slaveInterp; key.type = TCL_LIMIT_COMMANDS; hPtr = Tcl_FindHashEntry(&iPtr->limit.callbacks, (char *) &key); if (hPtr != NULL) { limitCBPtr = Tcl_GetHashValue(hPtr); if (limitCBPtr != NULL && limitCBPtr->scriptObj != NULL) { Tcl_DictObjPut(NULL, dictPtr, Tcl_NewStringObj(options[0], -1), limitCBPtr->scriptObj); } else { goto putEmptyCommandInDict; } } else { Tcl_Obj *empty; putEmptyCommandInDict: TclNewObj(empty); Tcl_DictObjPut(NULL, dictPtr, Tcl_NewStringObj(options[0], -1), empty); } Tcl_DictObjPut(NULL, dictPtr, Tcl_NewStringObj(options[1], -1), Tcl_NewIntObj(Tcl_LimitGetGranularity(slaveInterp, TCL_LIMIT_COMMANDS))); if (Tcl_LimitTypeEnabled(slaveInterp, TCL_LIMIT_COMMANDS)) { Tcl_DictObjPut(NULL, dictPtr, Tcl_NewStringObj(options[2], -1), Tcl_NewIntObj(Tcl_LimitGetCommands(slaveInterp))); } else { Tcl_Obj *empty; TclNewObj(empty); Tcl_DictObjPut(NULL, dictPtr, Tcl_NewStringObj(options[2], -1), empty); } Tcl_SetObjResult(interp, dictPtr); return TCL_OK; } else if (objc == consumedObjc+1) { if (Tcl_GetIndexFromObj(interp, objv[consumedObjc], options, "option", 0, &index) != TCL_OK) { return TCL_ERROR; } switch ((enum Options) index) { case OPT_CMD: key.interp = slaveInterp; key.type = TCL_LIMIT_COMMANDS; hPtr = Tcl_FindHashEntry(&iPtr->limit.callbacks, (char *) &key); if (hPtr != NULL) { limitCBPtr = Tcl_GetHashValue(hPtr); if (limitCBPtr != NULL && limitCBPtr->scriptObj != NULL) { Tcl_SetObjResult(interp, limitCBPtr->scriptObj); } } break; case OPT_GRAN: Tcl_SetObjResult(interp, Tcl_NewIntObj( Tcl_LimitGetGranularity(slaveInterp, TCL_LIMIT_COMMANDS))); break; case OPT_VAL: if (Tcl_LimitTypeEnabled(slaveInterp, TCL_LIMIT_COMMANDS)) { Tcl_SetObjResult(interp, Tcl_NewIntObj(Tcl_LimitGetCommands(slaveInterp))); } break; } return TCL_OK; } else if ((objc-consumedObjc) & 1 /* isOdd(objc-consumedObjc) */) { Tcl_WrongNumArgs(interp, consumedObjc, objv, "?-option? ?value? ?-option value ...?"); return TCL_ERROR; } else { int i, scriptLen = 0, limitLen = 0; Tcl_Obj *scriptObj = NULL, *granObj = NULL, *limitObj = NULL; int gran = 0, limit = 0; for (i=consumedObjc ; i<objc ; i+=2) { if (Tcl_GetIndexFromObj(interp, objv[i], options, "option", 0, &index) != TCL_OK) { return TCL_ERROR; } switch ((enum Options) index) { case OPT_CMD: scriptObj = objv[i+1]; (void) Tcl_GetStringFromObj(objv[i+1], &scriptLen); break; case OPT_GRAN: granObj = objv[i+1]; if (TclGetIntFromObj(interp, objv[i+1], &gran) != TCL_OK) { return TCL_ERROR; } if (gran < 1) { Tcl_AppendResult(interp, "granularity must be at " "least 1", NULL); return TCL_ERROR; } break; case OPT_VAL: limitObj = objv[i+1]; (void) Tcl_GetStringFromObj(objv[i+1], &limitLen); if (limitLen == 0) { break; } if (TclGetIntFromObj(interp, objv[i+1], &limit) != TCL_OK) { return TCL_ERROR; } if (limit < 0) { Tcl_AppendResult(interp, "command limit value must be at " "least 0", NULL); return TCL_ERROR; } break; } } if (scriptObj != NULL) { SetScriptLimitCallback(interp, TCL_LIMIT_COMMANDS, slaveInterp, (scriptLen > 0 ? scriptObj : NULL)); } if (granObj != NULL) { Tcl_LimitSetGranularity(slaveInterp, TCL_LIMIT_COMMANDS, gran); } if (limitObj != NULL) { if (limitLen > 0) { Tcl_LimitSetCommands(slaveInterp, limit); Tcl_LimitTypeSet(slaveInterp, TCL_LIMIT_COMMANDS); } else { Tcl_LimitTypeReset(slaveInterp, TCL_LIMIT_COMMANDS); } } return TCL_OK; } }  /* *---------------------------------------------------------------------- * * SlaveTimeLimitCmd -- * * Implementation of the [interp limit $i time] and [$i limit time] * subcommands. See the interp manual page for a full description. * * Results: * A standard Tcl result. * * Side effects: * Depends on the arguments. * *---------------------------------------------------------------------- */ static int SlaveTimeLimitCmd( Tcl_Interp *interp, /* Current interpreter. */ Tcl_Interp *slaveInterp, /* Interpreter being adjusted. */ int consumedObjc, /* Number of args already parsed. */ int objc, /* Total number of arguments. */ Tcl_Obj *const objv[]) /* Argument objects. */ { static const char *options[] = { "-command", "-granularity", "-milliseconds", "-seconds", NULL }; enum Options { OPT_CMD, OPT_GRAN, OPT_MILLI, OPT_SEC }; Interp *iPtr = (Interp *) interp; int index; ScriptLimitCallbackKey key; ScriptLimitCallback *limitCBPtr; Tcl_HashEntry *hPtr; if (objc == consumedObjc) { Tcl_Obj *dictPtr; TclNewObj(dictPtr); key.interp = slaveInterp; key.type = TCL_LIMIT_TIME; hPtr = Tcl_FindHashEntry(&iPtr->limit.callbacks, (char *) &key); if (hPtr != NULL) { limitCBPtr = Tcl_GetHashValue(hPtr); if (limitCBPtr != NULL && limitCBPtr->scriptObj != NULL) { Tcl_DictObjPut(NULL, dictPtr, Tcl_NewStringObj(options[0], -1), limitCBPtr->scriptObj); } else { goto putEmptyCommandInDict; } } else { Tcl_Obj *empty; putEmptyCommandInDict: TclNewObj(empty); Tcl_DictObjPut(NULL, dictPtr, Tcl_NewStringObj(options[0], -1), empty); } Tcl_DictObjPut(NULL, dictPtr, Tcl_NewStringObj(options[1], -1), Tcl_NewIntObj(Tcl_LimitGetGranularity(slaveInterp, TCL_LIMIT_TIME))); if (Tcl_LimitTypeEnabled(slaveInterp, TCL_LIMIT_TIME)) { Tcl_Time limitMoment; Tcl_LimitGetTime(slaveInterp, &limitMoment); Tcl_DictObjPut(NULL, dictPtr, Tcl_NewStringObj(options[2], -1), Tcl_NewLongObj(limitMoment.usec/1000)); Tcl_DictObjPut(NULL, dictPtr, Tcl_NewStringObj(options[3], -1), Tcl_NewLongObj(limitMoment.sec)); } else { Tcl_Obj *empty; TclNewObj(empty); Tcl_DictObjPut(NULL, dictPtr, Tcl_NewStringObj(options[2], -1), empty); Tcl_DictObjPut(NULL, dictPtr, Tcl_NewStringObj(options[3], -1), empty); } Tcl_SetObjResult(interp, dictPtr); return TCL_OK; } else if (objc == consumedObjc+1) { if (Tcl_GetIndexFromObj(interp, objv[consumedObjc], options, "option", 0, &index) != TCL_OK) { return TCL_ERROR; } switch ((enum Options) index) { case OPT_CMD: key.interp = slaveInterp; key.type = TCL_LIMIT_TIME; hPtr = Tcl_FindHashEntry(&iPtr->limit.callbacks, (char *) &key); if (hPtr != NULL) { limitCBPtr = Tcl_GetHashValue(hPtr); if (limitCBPtr != NULL && limitCBPtr->scriptObj != NULL) { Tcl_SetObjResult(interp, limitCBPtr->scriptObj); } } break; case OPT_GRAN: Tcl_SetObjResult(interp, Tcl_NewIntObj( Tcl_LimitGetGranularity(slaveInterp, TCL_LIMIT_TIME))); break; case OPT_MILLI: if (Tcl_LimitTypeEnabled(slaveInterp, TCL_LIMIT_TIME)) { Tcl_Time limitMoment; Tcl_LimitGetTime(slaveInterp, &limitMoment); Tcl_SetObjResult(interp, Tcl_NewLongObj(limitMoment.usec/1000)); } break; case OPT_SEC: if (Tcl_LimitTypeEnabled(slaveInterp, TCL_LIMIT_TIME)) { Tcl_Time limitMoment; Tcl_LimitGetTime(slaveInterp, &limitMoment); Tcl_SetObjResult(interp, Tcl_NewLongObj(limitMoment.sec)); } break; } return TCL_OK; } else if ((objc-consumedObjc) & 1 /* isOdd(objc-consumedObjc) */) { Tcl_WrongNumArgs(interp, consumedObjc, objv, "?-option? ?value? ?-option value ...?"); return TCL_ERROR; } else { int i, scriptLen = 0, milliLen = 0, secLen = 0; Tcl_Obj *scriptObj = NULL, *granObj = NULL; Tcl_Obj *milliObj = NULL, *secObj = NULL; int gran = 0; Tcl_Time limitMoment; int tmp; Tcl_LimitGetTime(slaveInterp, &limitMoment); for (i=consumedObjc ; i<objc ; i+=2) { if (Tcl_GetIndexFromObj(interp, objv[i], options, "option", 0, &index) != TCL_OK) { return TCL_ERROR; } switch ((enum Options) index) { case OPT_CMD: scriptObj = objv[i+1]; (void) Tcl_GetStringFromObj(objv[i+1], &scriptLen); break; case OPT_GRAN: granObj = objv[i+1]; if (TclGetIntFromObj(interp, objv[i+1], &gran) != TCL_OK) { return TCL_ERROR; } if (gran < 1) { Tcl_AppendResult(interp, "granularity must be at " "least 1", NULL); return TCL_ERROR; } break; case OPT_MILLI: milliObj = objv[i+1]; (void) Tcl_GetStringFromObj(objv[i+1], &milliLen); if (milliLen == 0) { break; } if (TclGetIntFromObj(interp, objv[i+1], &tmp) != TCL_OK) { return TCL_ERROR; } if (tmp < 0) { Tcl_AppendResult(interp, "milliseconds must be at least 0", NULL); return TCL_ERROR; } limitMoment.usec = ((long)tmp)*1000; break; case OPT_SEC: secObj = objv[i+1]; (void) Tcl_GetStringFromObj(objv[i+1], &secLen); if (secLen == 0) { break; } if (TclGetIntFromObj(interp, objv[i+1], &tmp) != TCL_OK) { return TCL_ERROR; } if (tmp < 0) { Tcl_AppendResult(interp, "seconds must be at least 0", NULL); return TCL_ERROR; } limitMoment.sec = tmp; break; } } if (milliObj != NULL || secObj != NULL) { if (milliObj != NULL) { /* * Setting -milliseconds but clearing -seconds, or resetting * -milliseconds but not resetting -seconds? Bad voodoo! */ if (secObj != NULL && secLen == 0 && milliLen > 0) { Tcl_AppendResult(interp, "may only set -milliseconds " "if -seconds is not also being reset", NULL); return TCL_ERROR; } if (milliLen == 0 && (secObj == NULL || secLen > 0)) { Tcl_AppendResult(interp, "may only reset -milliseconds " "if -seconds is also being reset", NULL); return TCL_ERROR; } } if (milliLen > 0 || secLen > 0) { /* * Force usec to be in range [0..1000000), possibly * incrementing sec in the process. This makes it much easier * for people to write scripts that do small time increments. */ limitMoment.sec += limitMoment.usec / 1000000; limitMoment.usec %= 1000000; Tcl_LimitSetTime(slaveInterp, &limitMoment); Tcl_LimitTypeSet(slaveInterp, TCL_LIMIT_TIME); } else { Tcl_LimitTypeReset(slaveInterp, TCL_LIMIT_TIME); } } if (scriptObj != NULL) { SetScriptLimitCallback(interp, TCL_LIMIT_TIME, slaveInterp, (scriptLen > 0 ? scriptObj : NULL)); } if (granObj != NULL) { Tcl_LimitSetGranularity(slaveInterp, TCL_LIMIT_TIME, gran); } return TCL_OK; } }  /* * Local Variables: * mode: c * c-basic-offset: 4 * fill-column: 78 * End: */

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