/* Python interpreter top-level routines, including init/exit */ #include "Python.h" #include "Python-ast.h" #undef Yield /* undefine macro conflicting with winbase.h */ #include "grammar.h" #include "node.h" #include "token.h" #include "parsetok.h" #include "errcode.h" #include "code.h" #include "compile.h" #include "symtable.h" #include "pyarena.h" #include "ast.h" #include "eval.h" #include "marshal.h" #include "abstract.h" #ifdef HAVE_SIGNAL_H #include #endif #ifdef MS_WINDOWS #include "malloc.h" /* for alloca */ #endif #ifdef HAVE_LANGINFO_H #include #include #endif #ifdef MS_WINDOWS #undef BYTE #include "windows.h" #endif #ifndef Py_REF_DEBUG #define PRINT_TOTAL_REFS() #else /* Py_REF_DEBUG */ #define PRINT_TOTAL_REFS() fprintf(stderr, \ "[%" PY_FORMAT_SIZE_T "d refs]\n", \ _Py_GetRefTotal()) #endif #ifdef __cplusplus extern "C" { #endif extern char *Py_GetPath(void); extern grammar _PyParser_Grammar; /* From graminit.c */ /* Forward */ static void initmain(void); static void initsite(void); static PyObject *run_mod(mod_ty, const char *, PyObject *, PyObject *, PyCompilerFlags *, PyArena *); static PyObject *run_pyc_file(FILE *, const char *, PyObject *, PyObject *, PyCompilerFlags *); static void err_input(perrdetail *); static void initsigs(void); static void wait_for_thread_shutdown(void); static void call_sys_exitfunc(void); static void call_ll_exitfuncs(void); extern void _PyUnicode_Init(void); extern void _PyUnicode_Fini(void); #ifdef WITH_THREAD extern void _PyGILState_Init(PyInterpreterState *, PyThreadState *); extern void _PyGILState_Fini(void); #endif /* WITH_THREAD */ int Py_DebugFlag; /* Needed by parser.c */ int Py_VerboseFlag; /* Needed by import.c */ int Py_InteractiveFlag; /* Needed by Py_FdIsInteractive() below */ int Py_InspectFlag; /* Needed to determine whether to exit at SystemError */ int Py_NoSiteFlag; /* Suppress 'import site' */ int Py_BytesWarningFlag; /* Warn on str(bytes) and str(buffer) */ int Py_DontWriteBytecodeFlag; /* Suppress writing bytecode files (*.py[co]) */ int Py_UseClassExceptionsFlag = 1; /* Needed by bltinmodule.c: deprecated */ int Py_FrozenFlag; /* Needed by getpath.c */ int Py_UnicodeFlag = 0; /* Needed by compile.c */ int Py_IgnoreEnvironmentFlag; /* e.g. PYTHONPATH, PYTHONHOME */ /* _XXX Py_QnewFlag should go away in 2.3. It's true iff -Qnew is passed, on the command line, and is used in 2.2 by ceval.c to make all "/" divisions true divisions (which they will be in 2.3). */ int _Py_QnewFlag = 0; int Py_NoUserSiteDirectory = 0; /* for -s and site.py */ /* PyModule_GetWarningsModule is no longer necessary as of 2.6 since _warnings is builtin. This API should not be used. */ PyObject * PyModule_GetWarningsModule(void) { return PyImport_ImportModule("warnings"); } static int initialized = 0; /* API to access the initialized flag -- useful for esoteric use */ int Py_IsInitialized(void) { return initialized; } /* Global initializations. Can be undone by Py_Finalize(). Don't call this twice without an intervening Py_Finalize() call. When initializations fail, a fatal error is issued and the function does not return. On return, the first thread and interpreter state have been created. Locking: you must hold the interpreter lock while calling this. (If the lock has not yet been initialized, that's equivalent to having the lock, but you cannot use multiple threads.) */ static int add_flag(int flag, const char *envs) { int env = atoi(envs); if (flag < env) flag = env; if (flag < 1) flag = 1; return flag; } void Py_InitializeEx(int install_sigs) { PyInterpreterState *interp; PyThreadState *tstate; PyObject *bimod, *sysmod; char *p; char *icodeset = NULL; /* On Windows, input codeset may theoretically differ from output codeset. */ char *codeset = NULL; char *errors = NULL; int free_codeset = 0; int overridden = 0; PyObject *sys_stream, *sys_isatty; #if defined(Py_USING_UNICODE) && defined(HAVE_LANGINFO_H) && defined(CODESET) char *saved_locale, *loc_codeset; #endif #ifdef MS_WINDOWS char ibuf[128]; char buf[128]; #endif extern void _Py_ReadyTypes(void); if (initialized) return; initialized = 1; if ((p = Py_GETENV("PYTHONDEBUG")) && *p != '\0') Py_DebugFlag = add_flag(Py_DebugFlag, p); if ((p = Py_GETENV("PYTHONVERBOSE")) && *p != '\0') Py_VerboseFlag = add_flag(Py_VerboseFlag, p); if ((p = Py_GETENV("PYTHONOPTIMIZE")) && *p != '\0') Py_OptimizeFlag = add_flag(Py_OptimizeFlag, p); if ((p = Py_GETENV("PYTHONDONTWRITEBYTECODE")) && *p != '\0') Py_DontWriteBytecodeFlag = add_flag(Py_DontWriteBytecodeFlag, p); interp = PyInterpreterState_New(); if (interp == NULL) Py_FatalError("Py_Initialize: can't make first interpreter"); tstate = PyThreadState_New(interp); if (tstate == NULL) Py_FatalError("Py_Initialize: can't make first thread"); (void) PyThreadState_Swap(tstate); _Py_ReadyTypes(); if (!_PyFrame_Init()) Py_FatalError("Py_Initialize: can't init frames"); if (!_PyInt_Init()) Py_FatalError("Py_Initialize: can't init ints"); if (!PyByteArray_Init()) Py_FatalError("Py_Initialize: can't init bytearray"); _PyFloat_Init(); interp->modules = PyDict_New(); if (interp->modules == NULL) Py_FatalError("Py_Initialize: can't make modules dictionary"); interp->modules_reloading = PyDict_New(); if (interp->modules_reloading == NULL) Py_FatalError("Py_Initialize: can't make modules_reloading dictionary"); #ifdef Py_USING_UNICODE /* Init Unicode implementation; relies on the codec registry */ _PyUnicode_Init(); #endif bimod = _PyBuiltin_Init(); if (bimod == NULL) Py_FatalError("Py_Initialize: can't initialize __builtin__"); interp->builtins = PyModule_GetDict(bimod); if (interp->builtins == NULL) Py_FatalError("Py_Initialize: can't initialize builtins dict"); Py_INCREF(interp->builtins); sysmod = _PySys_Init(); if (sysmod == NULL) Py_FatalError("Py_Initialize: can't initialize sys"); interp->sysdict = PyModule_GetDict(sysmod); if (interp->sysdict == NULL) Py_FatalError("Py_Initialize: can't initialize sys dict"); Py_INCREF(interp->sysdict); _PyImport_FixupExtension("sys", "sys"); PySys_SetPath(Py_GetPath()); PyDict_SetItemString(interp->sysdict, "modules", interp->modules); _PyImport_Init(); /* initialize builtin exceptions */ _PyExc_Init(); _PyImport_FixupExtension("exceptions", "exceptions"); /* phase 2 of builtins */ _PyImport_FixupExtension("__builtin__", "__builtin__"); _PyImportHooks_Init(); if (install_sigs) initsigs(); /* Signal handling stuff, including initintr() */ /* Initialize warnings. */ _PyWarnings_Init(); if (PySys_HasWarnOptions()) { PyObject *warnings_module = PyImport_ImportModule("warnings"); if (!warnings_module) PyErr_Clear(); Py_XDECREF(warnings_module); } initmain(); /* Module __main__ */ if (!Py_NoSiteFlag) initsite(); /* Module site */ /* auto-thread-state API, if available */ #ifdef WITH_THREAD _PyGILState_Init(interp, tstate); #endif /* WITH_THREAD */ if ((p = Py_GETENV("PYTHONIOENCODING")) && *p != '\0') { p = icodeset = codeset = strdup(p); free_codeset = 1; errors = strchr(p, ':'); if (errors) { *errors = '\0'; errors++; } overridden = 1; } #if defined(Py_USING_UNICODE) && defined(HAVE_LANGINFO_H) && defined(CODESET) /* On Unix, set the file system encoding according to the user's preference, if the CODESET names a well-known Python codec, and Py_FileSystemDefaultEncoding isn't initialized by other means. Also set the encoding of stdin and stdout if these are terminals, unless overridden. */ if (!overridden || !Py_FileSystemDefaultEncoding) { saved_locale = strdup(setlocale(LC_CTYPE, NULL)); setlocale(LC_CTYPE, ""); loc_codeset = nl_langinfo(CODESET); if (loc_codeset && *loc_codeset) { PyObject *enc = PyCodec_Encoder(loc_codeset); if (enc) { loc_codeset = strdup(loc_codeset); Py_DECREF(enc); } else { loc_codeset = NULL; PyErr_Clear(); } } else loc_codeset = NULL; setlocale(LC_CTYPE, saved_locale); free(saved_locale); if (!overridden) { codeset = icodeset = loc_codeset; free_codeset = 1; } /* Initialize Py_FileSystemDefaultEncoding from locale even if PYTHONIOENCODING is set. */ if (!Py_FileSystemDefaultEncoding) { Py_FileSystemDefaultEncoding = loc_codeset; if (!overridden) free_codeset = 0; } } #endif #ifdef MS_WINDOWS if (!overridden) { icodeset = ibuf; codeset = buf; sprintf(ibuf, "cp%d", GetConsoleCP()); sprintf(buf, "cp%d", GetConsoleOutputCP()); } #endif if (codeset) { sys_stream = PySys_GetObject("stdin"); sys_isatty = PyObject_CallMethod(sys_stream, "isatty", ""); if (!sys_isatty) PyErr_Clear(); if ((overridden || (sys_isatty && PyObject_IsTrue(sys_isatty))) && PyFile_Check(sys_stream)) { if (!PyFile_SetEncodingAndErrors(sys_stream, icodeset, errors)) Py_FatalError("Cannot set codeset of stdin"); } Py_XDECREF(sys_isatty); sys_stream = PySys_GetObject("stdout"); sys_isatty = PyObject_CallMethod(sys_stream, "isatty", ""); if (!sys_isatty) PyErr_Clear(); if ((overridden || (sys_isatty && PyObject_IsTrue(sys_isatty))) && PyFile_Check(sys_stream)) { if (!PyFile_SetEncodingAndErrors(sys_stream, codeset, errors)) Py_FatalError("Cannot set codeset of stdout"); } Py_XDECREF(sys_isatty); sys_stream = PySys_GetObject("stderr"); sys_isatty = PyObject_CallMethod(sys_stream, "isatty", ""); if (!sys_isatty) PyErr_Clear(); if((overridden || (sys_isatty && PyObject_IsTrue(sys_isatty))) && PyFile_Check(sys_stream)) { if (!PyFile_SetEncodingAndErrors(sys_stream, codeset, errors)) Py_FatalError("Cannot set codeset of stderr"); } Py_XDECREF(sys_isatty); if (free_codeset) free(codeset); } } void Py_Initialize(void) { Py_InitializeEx(1); } #ifdef COUNT_ALLOCS extern void dump_counts(FILE*); #endif /* Undo the effect of Py_Initialize(). Beware: if multiple interpreter and/or thread states exist, these are not wiped out; only the current thread and interpreter state are deleted. But since everything else is deleted, those other interpreter and thread states should no longer be used. (XXX We should do better, e.g. wipe out all interpreters and threads.) Locking: as above. */ void Py_Finalize(void) { PyInterpreterState *interp; PyThreadState *tstate; if (!initialized) return; wait_for_thread_shutdown(); /* The interpreter is still entirely intact at this point, and the * exit funcs may be relying on that. In particular, if some thread * or exit func is still waiting to do an import, the import machinery * expects Py_IsInitialized() to return true. So don't say the * interpreter is uninitialized until after the exit funcs have run. * Note that Threading.py uses an exit func to do a join on all the * threads created thru it, so this also protects pending imports in * the threads created via Threading. */ call_sys_exitfunc(); initialized = 0; /* Get current thread state and interpreter pointer */ tstate = PyThreadState_GET(); interp = tstate->interp; /* Disable signal handling */ PyOS_FiniInterrupts(); /* Clear type lookup cache */ PyType_ClearCache(); /* Collect garbage. This may call finalizers; it's nice to call these * before all modules are destroyed. * XXX If a __del__ or weakref callback is triggered here, and tries to * XXX import a module, bad things can happen, because Python no * XXX longer believes it's initialized. * XXX Fatal Python error: Interpreter not initialized (version mismatch?) * XXX is easy to provoke that way. I've also seen, e.g., * XXX Exception exceptions.ImportError: 'No module named sha' * XXX in ignored * XXX but I'm unclear on exactly how that one happens. In any case, * XXX I haven't seen a real-life report of either of these. */ PyGC_Collect(); #ifdef COUNT_ALLOCS /* With COUNT_ALLOCS, it helps to run GC multiple times: each collection might release some types from the type list, so they become garbage. */ while (PyGC_Collect() > 0) /* nothing */; #endif /* Destroy all modules */ PyImport_Cleanup(); /* Collect final garbage. This disposes of cycles created by * new-style class definitions, for example. * XXX This is disabled because it caused too many problems. If * XXX a __del__ or weakref callback triggers here, Python code has * XXX a hard time running, because even the sys module has been * XXX cleared out (sys.stdout is gone, sys.excepthook is gone, etc). * XXX One symptom is a sequence of information-free messages * XXX coming from threads (if a __del__ or callback is invoked, * XXX other threads can execute too, and any exception they encounter * XXX triggers a comedy of errors as subsystem after subsystem * XXX fails to find what it *expects* to find in sys to help report * XXX the exception and consequent unexpected failures). I've also * XXX seen segfaults then, after adding print statements to the * XXX Python code getting called. */ #if 0 PyGC_Collect(); #endif /* Destroy the database used by _PyImport_{Fixup,Find}Extension */ _PyImport_Fini(); /* Debugging stuff */ #ifdef COUNT_ALLOCS dump_counts(stdout); #endif PRINT_TOTAL_REFS(); #ifdef Py_TRACE_REFS /* Display all objects still alive -- this can invoke arbitrary * __repr__ overrides, so requires a mostly-intact interpreter. * Alas, a lot of stuff may still be alive now that will be cleaned * up later. */ if (Py_GETENV("PYTHONDUMPREFS")) _Py_PrintReferences(stderr); #endif /* Py_TRACE_REFS */ /* Clear interpreter state */ PyInterpreterState_Clear(interp); /* Now we decref the exception classes. After this point nothing can raise an exception. That's okay, because each Fini() method below has been checked to make sure no exceptions are ever raised. */ _PyExc_Fini(); /* Cleanup auto-thread-state */ #ifdef WITH_THREAD _PyGILState_Fini(); #endif /* WITH_THREAD */ /* Delete current thread */ PyThreadState_Swap(NULL); PyInterpreterState_Delete(interp); /* Sundry finalizers */ PyMethod_Fini(); PyFrame_Fini(); PyCFunction_Fini(); PyTuple_Fini(); PyList_Fini(); PySet_Fini(); PyString_Fini(); PyByteArray_Fini(); PyInt_Fini(); PyFloat_Fini(); PyDict_Fini(); #ifdef Py_USING_UNICODE /* Cleanup Unicode implementation */ _PyUnicode_Fini(); #endif /* XXX Still allocated: - various static ad-hoc pointers to interned strings - int and float free list blocks - whatever various modules and libraries allocate */ PyGrammar_RemoveAccelerators(&_PyParser_Grammar); #ifdef Py_TRACE_REFS /* Display addresses (& refcnts) of all objects still alive. * An address can be used to find the repr of the object, printed * above by _Py_PrintReferences. */ if (Py_GETENV("PYTHONDUMPREFS")) _Py_PrintReferenceAddresses(stderr); #endif /* Py_TRACE_REFS */ #ifdef PYMALLOC_DEBUG if (Py_GETENV("PYTHONMALLOCSTATS")) _PyObject_DebugMallocStats(); #endif call_ll_exitfuncs(); } /* Create and initialize a new interpreter and thread, and return the new thread. This requires that Py_Initialize() has been called first. Unsuccessful initialization yields a NULL pointer. Note that *no* exception information is available even in this case -- the exception information is held in the thread, and there is no thread. Locking: as above. */ PyThreadState * Py_NewInterpreter(void) { PyInterpreterState *interp; PyThreadState *tstate, *save_tstate; PyObject *bimod, *sysmod; if (!initialized) Py_FatalError("Py_NewInterpreter: call Py_Initialize first"); interp = PyInterpreterState_New(); if (interp == NULL) return NULL; tstate = PyThreadState_New(interp); if (tstate == NULL) { PyInterpreterState_Delete(interp); return NULL; } save_tstate = PyThreadState_Swap(tstate); /* XXX The following is lax in error checking */ interp->modules = PyDict_New(); interp->modules_reloading = PyDict_New(); bimod = _PyImport_FindExtension("__builtin__", "__builtin__"); if (bimod != NULL) { interp->builtins = PyModule_GetDict(bimod); if (interp->builtins == NULL) goto handle_error; Py_INCREF(interp->builtins); } sysmod = _PyImport_FindExtension("sys", "sys"); if (bimod != NULL && sysmod != NULL) { interp->sysdict = PyModule_GetDict(sysmod); if (interp->sysdict == NULL) goto handle_error; Py_INCREF(interp->sysdict); PySys_SetPath(Py_GetPath()); PyDict_SetItemString(interp->sysdict, "modules", interp->modules); _PyImportHooks_Init(); initmain(); if (!Py_NoSiteFlag) initsite(); } if (!PyErr_Occurred()) return tstate; handle_error: /* Oops, it didn't work. Undo it all. */ PyErr_Print(); PyThreadState_Clear(tstate); PyThreadState_Swap(save_tstate); PyThreadState_Delete(tstate); PyInterpreterState_Delete(interp); return NULL; } /* Delete an interpreter and its last thread. This requires that the given thread state is current, that the thread has no remaining frames, and that it is its interpreter's only remaining thread. It is a fatal error to violate these constraints. (Py_Finalize() doesn't have these constraints -- it zaps everything, regardless.) Locking: as above. */ void Py_EndInterpreter(PyThreadState *tstate) { PyInterpreterState *interp = tstate->interp; if (tstate != PyThreadState_GET()) Py_FatalError("Py_EndInterpreter: thread is not current"); if (tstate->frame != NULL) Py_FatalError("Py_EndInterpreter: thread still has a frame"); if (tstate != interp->tstate_head || tstate->next != NULL) Py_FatalError("Py_EndInterpreter: not the last thread"); PyImport_Cleanup(); PyInterpreterState_Clear(interp); PyThreadState_Swap(NULL); PyInterpreterState_Delete(interp); } static char *progname = "python"; void Py_SetProgramName(char *pn) { if (pn && *pn) progname = pn; } char * Py_GetProgramName(void) { return progname; } static char *default_home = NULL; void Py_SetPythonHome(char *home) { default_home = home; } char * Py_GetPythonHome(void) { char *home = default_home; if (home == NULL && !Py_IgnoreEnvironmentFlag) home = Py_GETENV("PYTHONHOME"); return home; } /* Create __main__ module */ static void initmain(void) { PyObject *m, *d; m = PyImport_AddModule("__main__"); if (m == NULL) Py_FatalError("can't create __main__ module"); d = PyModule_GetDict(m); if (PyDict_GetItemString(d, "__builtins__") == NULL) { PyObject *bimod = PyImport_ImportModule("__builtin__"); if (bimod == NULL || PyDict_SetItemString(d, "__builtins__", bimod) != 0) Py_FatalError("can't add __builtins__ to __main__"); Py_DECREF(bimod); } } /* Import the site module (not into __main__ though) */ static void initsite(void) { PyObject *m, *f; m = PyImport_ImportModule("site"); if (m == NULL) { f = PySys_GetObject("stderr"); if (Py_VerboseFlag) { PyFile_WriteString( "'import site' failed; traceback:\n", f); PyErr_Print(); } else { PyFile_WriteString( "'import site' failed; use -v for traceback\n", f); PyErr_Clear(); } } else { Py_DECREF(m); } } /* Parse input from a file and execute it */ int PyRun_AnyFileExFlags(FILE *fp, const char *filename, int closeit, PyCompilerFlags *flags) { if (filename == NULL) filename = "???"; if (Py_FdIsInteractive(fp, filename)) { int err = PyRun_InteractiveLoopFlags(fp, filename, flags); if (closeit) fclose(fp); return err; } else return PyRun_SimpleFileExFlags(fp, filename, closeit, flags); } int PyRun_InteractiveLoopFlags(FILE *fp, const char *filename, PyCompilerFlags *flags) { PyObject *v; int ret; PyCompilerFlags local_flags; if (flags == NULL) { flags = &local_flags; local_flags.cf_flags = 0; } v = PySys_GetObject("ps1"); if (v == NULL) { PySys_SetObject("ps1", v = PyString_FromString(">>> ")); Py_XDECREF(v); } v = PySys_GetObject("ps2"); if (v == NULL) { PySys_SetObject("ps2", v = PyString_FromString("... ")); Py_XDECREF(v); } for (;;) { ret = PyRun_InteractiveOneFlags(fp, filename, flags); PRINT_TOTAL_REFS(); if (ret == E_EOF) return 0; /* if (ret == E_NOMEM) return -1; */ } } #if 0 /* compute parser flags based on compiler flags */ #define PARSER_FLAGS(flags) \ ((flags) ? ((((flags)->cf_flags & PyCF_DONT_IMPLY_DEDENT) ? \ PyPARSE_DONT_IMPLY_DEDENT : 0)) : 0) #endif #if 1 /* Keep an example of flags with future keyword support. */ #define PARSER_FLAGS(flags) \ ((flags) ? ((((flags)->cf_flags & PyCF_DONT_IMPLY_DEDENT) ? \ PyPARSE_DONT_IMPLY_DEDENT : 0) \ | (((flags)->cf_flags & CO_FUTURE_PRINT_FUNCTION) ? \ PyPARSE_PRINT_IS_FUNCTION : 0) \ | (((flags)->cf_flags & CO_FUTURE_UNICODE_LITERALS) ? \ PyPARSE_UNICODE_LITERALS : 0) \ ) : 0) #endif int PyRun_InteractiveOneFlags(FILE *fp, const char *filename, PyCompilerFlags *flags) { PyObject *m, *d, *v, *w; mod_ty mod; PyArena *arena; char *ps1 = "", *ps2 = ""; int errcode = 0; v = PySys_GetObject("ps1"); if (v != NULL) { v = PyObject_Str(v); if (v == NULL) PyErr_Clear(); else if (PyString_Check(v)) ps1 = PyString_AsString(v); } w = PySys_GetObject("ps2"); if (w != NULL) { w = PyObject_Str(w); if (w == NULL) PyErr_Clear(); else if (PyString_Check(w)) ps2 = PyString_AsString(w); } arena = PyArena_New(); if (arena == NULL) { Py_XDECREF(v); Py_XDECREF(w); return -1; } mod = PyParser_ASTFromFile(fp, filename, Py_single_input, ps1, ps2, flags, &errcode, arena); Py_XDECREF(v); Py_XDECREF(w); if (mod == NULL) { PyArena_Free(arena); if (errcode == E_EOF) { PyErr_Clear(); return E_EOF; } PyErr_Print(); return -1; } m = PyImport_AddModule("__main__"); if (m == NULL) { PyArena_Free(arena); return -1; } d = PyModule_GetDict(m); v = run_mod(mod, filename, d, d, flags, arena); PyArena_Free(arena); if (v == NULL) { PyErr_Print(); return -1; } Py_DECREF(v); if (Py_FlushLine()) PyErr_Clear(); return 0; } /* Check whether a file maybe a pyc file: Look at the extension, the file type, and, if we may close it, at the first few bytes. */ static int maybe_pyc_file(FILE *fp, const char* filename, const char* ext, int closeit) { if (strcmp(ext, ".pyc") == 0 || strcmp(ext, ".pyo") == 0) return 1; /* Only look into the file if we are allowed to close it, since it then should also be seekable. */ if (closeit) { /* Read only two bytes of the magic. If the file was opened in text mode, the bytes 3 and 4 of the magic (\r\n) might not be read as they are on disk. */ unsigned int halfmagic = PyImport_GetMagicNumber() & 0xFFFF; unsigned char buf[2]; /* Mess: In case of -x, the stream is NOT at its start now, and ungetc() was used to push back the first newline, which makes the current stream position formally undefined, and a x-platform nightmare. Unfortunately, we have no direct way to know whether -x was specified. So we use a terrible hack: if the current stream position is not 0, we assume -x was specified, and give up. Bug 132850 on SourceForge spells out the hopelessness of trying anything else (fseek and ftell don't work predictably x-platform for text-mode files). */ int ispyc = 0; if (ftell(fp) == 0) { if (fread(buf, 1, 2, fp) == 2 && ((unsigned int)buf[1]<<8 | buf[0]) == halfmagic) ispyc = 1; rewind(fp); } return ispyc; } return 0; } int PyRun_SimpleFileExFlags(FILE *fp, const char *filename, int closeit, PyCompilerFlags *flags) { PyObject *m, *d, *v; const char *ext; int set_file_name = 0, ret, len; m = PyImport_AddModule("__main__"); if (m == NULL) return -1; d = PyModule_GetDict(m); if (PyDict_GetItemString(d, "__file__") == NULL) { PyObject *f = PyString_FromString(filename); if (f == NULL) return -1; if (PyDict_SetItemString(d, "__file__", f) < 0) { Py_DECREF(f); return -1; } set_file_name = 1; Py_DECREF(f); } len = strlen(filename); ext = filename + len - (len > 4 ? 4 : 0); if (maybe_pyc_file(fp, filename, ext, closeit)) { /* Try to run a pyc file. First, re-open in binary */ if (closeit) fclose(fp); if ((fp = fopen(filename, "rb")) == NULL) { fprintf(stderr, "python: Can't reopen .pyc file\n"); ret = -1; goto done; } /* Turn on optimization if a .pyo file is given */ if (strcmp(ext, ".pyo") == 0) Py_OptimizeFlag = 1; v = run_pyc_file(fp, filename, d, d, flags); } else { v = PyRun_FileExFlags(fp, filename, Py_file_input, d, d, closeit, flags); } if (v == NULL) { PyErr_Print(); ret = -1; goto done; } Py_DECREF(v); if (Py_FlushLine()) PyErr_Clear(); ret = 0; done: if (set_file_name && PyDict_DelItemString(d, "__file__")) PyErr_Clear(); return ret; } int PyRun_SimpleStringFlags(const char *command, PyCompilerFlags *flags) { PyObject *m, *d, *v; m = PyImport_AddModule("__main__"); if (m == NULL) return -1; d = PyModule_GetDict(m); v = PyRun_StringFlags(command, Py_file_input, d, d, flags); if (v == NULL) { PyErr_Print(); return -1; } Py_DECREF(v); if (Py_FlushLine()) PyErr_Clear(); return 0; } static int parse_syntax_error(PyObject *err, PyObject **message, const char **filename, int *lineno, int *offset, const char **text) { long hold; PyObject *v; /* old style errors */ if (PyTuple_Check(err)) return PyArg_ParseTuple(err, "O(ziiz)", message, filename, lineno, offset, text); /* new style errors. `err' is an instance */ if (! (v = PyObject_GetAttrString(err, "msg"))) goto finally; *message = v; if (!(v = PyObject_GetAttrString(err, "filename"))) goto finally; if (v == Py_None) *filename = NULL; else if (! (*filename = PyString_AsString(v))) goto finally; Py_DECREF(v); if (!(v = PyObject_GetAttrString(err, "lineno"))) goto finally; hold = PyInt_AsLong(v); Py_DECREF(v); v = NULL; if (hold < 0 && PyErr_Occurred()) goto finally; *lineno = (int)hold; if (!(v = PyObject_GetAttrString(err, "offset"))) goto finally; if (v == Py_None) { *offset = -1; Py_DECREF(v); v = NULL; } else { hold = PyInt_AsLong(v); Py_DECREF(v); v = NULL; if (hold < 0 && PyErr_Occurred()) goto finally; *offset = (int)hold; } if (!(v = PyObject_GetAttrString(err, "text"))) goto finally; if (v == Py_None) *text = NULL; else if (! (*text = PyString_AsString(v))) goto finally; Py_DECREF(v); return 1; finally: Py_XDECREF(v); return 0; } void PyErr_Print(void) { PyErr_PrintEx(1); } static void print_error_text(PyObject *f, int offset, const char *text) { char *nl; if (offset >= 0) { if (offset > 0 && offset == (int)strlen(text)) offset--; for (;;) { nl = strchr(text, '\n'); if (nl == NULL || nl-text >= offset) break; offset -= (int)(nl+1-text); text = nl+1; } while (*text == ' ' || *text == '\t') { text++; offset--; } } PyFile_WriteString(" ", f); PyFile_WriteString(text, f); if (*text == '\0' || text[strlen(text)-1] != '\n') PyFile_WriteString("\n", f); if (offset == -1) return; PyFile_WriteString(" ", f); offset--; while (offset > 0) { PyFile_WriteString(" ", f); offset--; } PyFile_WriteString("^\n", f); } static void handle_system_exit(void) { PyObject *exception, *value, *tb; int exitcode = 0; if (Py_InspectFlag) /* Don't exit if -i flag was given. This flag is set to 0 * when entering interactive mode for inspecting. */ return; PyErr_Fetch(&exception, &value, &tb); if (Py_FlushLine()) PyErr_Clear(); fflush(stdout); if (value == NULL || value == Py_None) goto done; if (PyExceptionInstance_Check(value)) { /* The error code should be in the `code' attribute. */ PyObject *code = PyObject_GetAttrString(value, "code"); if (code) { Py_DECREF(value); value = code; if (value == Py_None) goto done; } /* If we failed to dig out the 'code' attribute, just let the else clause below print the error. */ } if (PyInt_Check(value)) exitcode = (int)PyInt_AsLong(value); else { PyObject_Print(value, stderr, Py_PRINT_RAW); PySys_WriteStderr("\n"); exitcode = 1; } done: /* Restore and clear the exception info, in order to properly decref * the exception, value, and traceback. If we just exit instead, * these leak, which confuses PYTHONDUMPREFS output, and may prevent * some finalizers from running. */ PyErr_Restore(exception, value, tb); PyErr_Clear(); Py_Exit(exitcode); /* NOTREACHED */ } void PyErr_PrintEx(int set_sys_last_vars) { PyObject *exception, *v, *tb, *hook; if (PyErr_ExceptionMatches(PyExc_SystemExit)) { handle_system_exit(); } PyErr_Fetch(&exception, &v, &tb); if (exception == NULL) return; PyErr_NormalizeException(&exception, &v, &tb); if (exception == NULL) return; /* Now we know v != NULL too */ if (set_sys_last_vars) { PySys_SetObject("last_type", exception); PySys_SetObject("last_value", v); PySys_SetObject("last_traceback", tb); } hook = PySys_GetObject("excepthook"); if (hook) { PyObject *args = PyTuple_Pack(3, exception, v, tb ? tb : Py_None); PyObject *result = PyEval_CallObject(hook, args); if (result == NULL) { PyObject *exception2, *v2, *tb2; if (PyErr_ExceptionMatches(PyExc_SystemExit)) { handle_system_exit(); } PyErr_Fetch(&exception2, &v2, &tb2); PyErr_NormalizeException(&exception2, &v2, &tb2); /* It should not be possible for exception2 or v2 to be NULL. However PyErr_Display() can't tolerate NULLs, so just be safe. */ if (exception2 == NULL) { exception2 = Py_None; Py_INCREF(exception2); } if (v2 == NULL) { v2 = Py_None; Py_INCREF(v2); } if (Py_FlushLine()) PyErr_Clear(); fflush(stdout); PySys_WriteStderr("Error in sys.excepthook:\n"); PyErr_Display(exception2, v2, tb2); PySys_WriteStderr("\nOriginal exception was:\n"); PyErr_Display(exception, v, tb); Py_DECREF(exception2); Py_DECREF(v2); Py_XDECREF(tb2); } Py_XDECREF(result); Py_XDECREF(args); } else { PySys_WriteStderr("sys.excepthook is missing\n"); PyErr_Display(exception, v, tb); } Py_XDECREF(exception); Py_XDECREF(v); Py_XDECREF(tb); } void PyErr_Display(PyObject *exception, PyObject *value, PyObject *tb) { int err = 0; PyObject *f = PySys_GetObject("stderr"); Py_INCREF(value); if (f == NULL) fprintf(stderr, "lost sys.stderr\n"); else { if (Py_FlushLine()) PyErr_Clear(); fflush(stdout); if (tb && tb != Py_None) err = PyTraceBack_Print(tb, f); if (err == 0 && PyObject_HasAttrString(value, "print_file_and_line")) { PyObject *message; const char *filename, *text; int lineno, offset; if (!parse_syntax_error(value, &message, &filename, &lineno, &offset, &text)) PyErr_Clear(); else { char buf[10]; PyFile_WriteString(" File \"", f); if (filename == NULL) PyFile_WriteString("", f); else PyFile_WriteString(filename, f); PyFile_WriteString("\", line ", f); PyOS_snprintf(buf, sizeof(buf), "%d", lineno); PyFile_WriteString(buf, f); PyFile_WriteString("\n", f); if (text != NULL) print_error_text(f, offset, text); Py_DECREF(value); value = message; /* Can't be bothered to check all those PyFile_WriteString() calls */ if (PyErr_Occurred()) err = -1; } } if (err) { /* Don't do anything else */ } else if (PyExceptionClass_Check(exception)) { PyObject* moduleName; char* className = PyExceptionClass_Name(exception); if (className != NULL) { char *dot = strrchr(className, '.'); if (dot != NULL) className = dot+1; } moduleName = PyObject_GetAttrString(exception, "__module__"); if (moduleName == NULL) err = PyFile_WriteString("", f); else { char* modstr = PyString_AsString(moduleName); if (modstr && strcmp(modstr, "exceptions")) { err = PyFile_WriteString(modstr, f); err += PyFile_WriteString(".", f); } Py_DECREF(moduleName); } if (err == 0) { if (className == NULL) err = PyFile_WriteString("", f); else err = PyFile_WriteString(className, f); } } else err = PyFile_WriteObject(exception, f, Py_PRINT_RAW); if (err == 0 && (value != Py_None)) { PyObject *s = PyObject_Str(value); /* only print colon if the str() of the object is not the empty string */ if (s == NULL) err = -1; else if (!PyString_Check(s) || PyString_GET_SIZE(s) != 0) err = PyFile_WriteString(": ", f); if (err == 0) err = PyFile_WriteObject(s, f, Py_PRINT_RAW); Py_XDECREF(s); } /* try to write a newline in any case */ err += PyFile_WriteString("\n", f); } Py_DECREF(value); /* If an error happened here, don't show it. XXX This is wrong, but too many callers rely on this behavior. */ if (err != 0) PyErr_Clear(); } PyObject * PyRun_StringFlags(const char *str, int start, PyObject *globals, PyObject *locals, PyCompilerFlags *flags) { PyObject *ret = NULL; mod_ty mod; PyArena *arena = PyArena_New(); if (arena == NULL) return NULL; mod = PyParser_ASTFromString(str, "", start, flags, arena); if (mod != NULL) ret = run_mod(mod, "", globals, locals, flags, arena); PyArena_Free(arena); return ret; } PyObject * PyRun_FileExFlags(FILE *fp, const char *filename, int start, PyObject *globals, PyObject *locals, int closeit, PyCompilerFlags *flags) { PyObject *ret; mod_ty mod; PyArena *arena = PyArena_New(); if (arena == NULL) return NULL; mod = PyParser_ASTFromFile(fp, filename, start, 0, 0, flags, NULL, arena); if (closeit) fclose(fp); if (mod == NULL) { PyArena_Free(arena); return NULL; } ret = run_mod(mod, filename, globals, locals, flags, arena); PyArena_Free(arena); return ret; } static PyObject * run_mod(mod_ty mod, const char *filename, PyObject *globals, PyObject *locals, PyCompilerFlags *flags, PyArena *arena) { PyCodeObject *co; PyObject *v; co = PyAST_Compile(mod, filename, flags, arena); if (co == NULL) return NULL; v = PyEval_EvalCode(co, globals, locals); Py_DECREF(co); return v; } static PyObject * run_pyc_file(FILE *fp, const char *filename, PyObject *globals, PyObject *locals, PyCompilerFlags *flags) { PyCodeObject *co; PyObject *v; long magic; long PyImport_GetMagicNumber(void); magic = PyMarshal_ReadLongFromFile(fp); if (magic != PyImport_GetMagicNumber()) { PyErr_SetString(PyExc_RuntimeError, "Bad magic number in .pyc file"); return NULL; } (void) PyMarshal_ReadLongFromFile(fp); v = PyMarshal_ReadLastObjectFromFile(fp); fclose(fp); if (v == NULL || !PyCode_Check(v)) { Py_XDECREF(v); PyErr_SetString(PyExc_RuntimeError, "Bad code object in .pyc file"); return NULL; } co = (PyCodeObject *)v; v = PyEval_EvalCode(co, globals, locals); if (v && flags) flags->cf_flags |= (co->co_flags & PyCF_MASK); Py_DECREF(co); return v; } PyObject * Py_CompileStringFlags(const char *str, const char *filename, int start, PyCompilerFlags *flags) { PyCodeObject *co; mod_ty mod; PyArena *arena = PyArena_New(); if (arena == NULL) return NULL; mod = PyParser_ASTFromString(str, filename, start, flags, arena); if (mod == NULL) { PyArena_Free(arena); return NULL; } if (flags && (flags->cf_flags & PyCF_ONLY_AST)) { PyObject *result = PyAST_mod2obj(mod); PyArena_Free(arena); return result; } co = PyAST_Compile(mod, filename, flags, arena); PyArena_Free(arena); return (PyObject *)co; } struct symtable * Py_SymtableString(const char *str, const char *filename, int start) { struct symtable *st; mod_ty mod; PyCompilerFlags flags; PyArena *arena = PyArena_New(); if (arena == NULL) return NULL; flags.cf_flags = 0; mod = PyParser_ASTFromString(str, filename, start, &flags, arena); if (mod == NULL) { PyArena_Free(arena); return NULL; } st = PySymtable_Build(mod, filename, 0); PyArena_Free(arena); return st; } /* Preferred access to parser is through AST. */ mod_ty PyParser_ASTFromString(const char *s, const char *filename, int start, PyCompilerFlags *flags, PyArena *arena) { mod_ty mod; PyCompilerFlags localflags; perrdetail err; int iflags = PARSER_FLAGS(flags); node *n = PyParser_ParseStringFlagsFilenameEx(s, filename, &_PyParser_Grammar, start, &err, &iflags); if (flags == NULL) { localflags.cf_flags = 0; flags = &localflags; } if (n) { flags->cf_flags |= iflags & PyCF_MASK; mod = PyAST_FromNode(n, flags, filename, arena); PyNode_Free(n); return mod; } else { err_input(&err); return NULL; } } mod_ty PyParser_ASTFromFile(FILE *fp, const char *filename, int start, char *ps1, char *ps2, PyCompilerFlags *flags, int *errcode, PyArena *arena) { mod_ty mod; PyCompilerFlags localflags; perrdetail err; int iflags = PARSER_FLAGS(flags); node *n = PyParser_ParseFileFlagsEx(fp, filename, &_PyParser_Grammar, start, ps1, ps2, &err, &iflags); if (flags == NULL) { localflags.cf_flags = 0; flags = &localflags; } if (n) { flags->cf_flags |= iflags & PyCF_MASK; mod = PyAST_FromNode(n, flags, filename, arena); PyNode_Free(n); return mod; } else { err_input(&err); if (errcode) *errcode = err.error; return NULL; } } /* Simplified interface to parsefile -- return node or set exception */ node * PyParser_SimpleParseFileFlags(FILE *fp, const char *filename, int start, int flags) { perrdetail err; node *n = PyParser_ParseFileFlags(fp, filename, &_PyParser_Grammar, start, NULL, NULL, &err, flags); if (n == NULL) err_input(&err); return n; } /* Simplified interface to parsestring -- return node or set exception */ node * PyParser_SimpleParseStringFlags(const char *str, int start, int flags) { perrdetail err; node *n = PyParser_ParseStringFlags(str, &_PyParser_Grammar, start, &err, flags); if (n == NULL) err_input(&err); return n; } node * PyParser_SimpleParseStringFlagsFilename(const char *str, const char *filename, int start, int flags) { perrdetail err; node *n = PyParser_ParseStringFlagsFilename(str, filename, &_PyParser_Grammar, start, &err, flags); if (n == NULL) err_input(&err); return n; } node * PyParser_SimpleParseStringFilename(const char *str, const char *filename, int start) { return PyParser_SimpleParseStringFlagsFilename(str, filename, start, 0); } /* May want to move a more generalized form of this to parsetok.c or even parser modules. */ void PyParser_SetError(perrdetail *err) { err_input(err); } /* Set the error appropriate to the given input error code (see errcode.h) */ static void err_input(perrdetail *err) { PyObject *v, *w, *errtype; PyObject* u = NULL; char *msg = NULL; errtype = PyExc_SyntaxError; switch (err->error) { case E_SYNTAX: errtype = PyExc_IndentationError; if (err->expected == INDENT) msg = "expected an indented block"; else if (err->token == INDENT) msg = "unexpected indent"; else if (err->token == DEDENT) msg = "unexpected unindent"; else { errtype = PyExc_SyntaxError; msg = "invalid syntax"; } break; case E_TOKEN: msg = "invalid token"; break; case E_EOFS: msg = "EOF while scanning triple-quoted string literal"; break; case E_EOLS: msg = "EOL while scanning string literal"; break; case E_INTR: if (!PyErr_Occurred()) PyErr_SetNone(PyExc_KeyboardInterrupt); goto cleanup; case E_NOMEM: PyErr_NoMemory(); goto cleanup; case E_EOF: msg = "unexpected EOF while parsing"; break; case E_TABSPACE: errtype = PyExc_TabError; msg = "inconsistent use of tabs and spaces in indentation"; break; case E_OVERFLOW: msg = "expression too long"; break; case E_DEDENT: errtype = PyExc_IndentationError; msg = "unindent does not match any outer indentation level"; break; case E_TOODEEP: errtype = PyExc_IndentationError; msg = "too many levels of indentation"; break; case E_DECODE: { PyObject *type, *value, *tb; PyErr_Fetch(&type, &value, &tb); if (value != NULL) { u = PyObject_Str(value); if (u != NULL) { msg = PyString_AsString(u); } } if (msg == NULL) msg = "unknown decode error"; Py_XDECREF(type); Py_XDECREF(value); Py_XDECREF(tb); break; } case E_LINECONT: msg = "unexpected character after line continuation character"; break; default: fprintf(stderr, "error=%d\n", err->error); msg = "unknown parsing error"; break; } v = Py_BuildValue("(ziiz)", err->filename, err->lineno, err->offset, err->text); w = NULL; if (v != NULL) w = Py_BuildValue("(sO)", msg, v); Py_XDECREF(u); Py_XDECREF(v); PyErr_SetObject(errtype, w); Py_XDECREF(w); cleanup: if (err->text != NULL) { PyObject_FREE(err->text); err->text = NULL; } } /* Print fatal error message and abort */ void Py_FatalError(const char *msg) { fprintf(stderr, "Fatal Python error: %s\n", msg); fflush(stderr); /* it helps in Windows debug build */ #ifdef MS_WINDOWS { size_t len = strlen(msg); WCHAR* buffer; size_t i; /* Convert the message to wchar_t. This uses a simple one-to-one conversion, assuming that the this error message actually uses ASCII only. If this ceases to be true, we will have to convert. */ buffer = alloca( (len+1) * (sizeof *buffer)); for( i=0; i<=len; ++i) buffer[i] = msg[i]; OutputDebugStringW(L"Fatal Python error: "); OutputDebugStringW(buffer); OutputDebugStringW(L"\n"); } #ifdef _DEBUG DebugBreak(); #endif #endif /* MS_WINDOWS */ abort(); } /* Clean up and exit */ #ifdef WITH_THREAD #include "pythread.h" #endif /* Wait until threading._shutdown completes, provided the threading module was imported in the first place. The shutdown routine will wait until all non-daemon "threading" threads have completed. */ static void wait_for_thread_shutdown(void) { #ifdef WITH_THREAD PyObject *result; PyThreadState *tstate = PyThreadState_GET(); PyObject *threading = PyMapping_GetItemString(tstate->interp->modules, "threading"); if (threading == NULL) { /* threading not imported */ PyErr_Clear(); return; } result = PyObject_CallMethod(threading, "_shutdown", ""); if (result == NULL) PyErr_WriteUnraisable(threading); else Py_DECREF(result); Py_DECREF(threading); #endif } #define NEXITFUNCS 32 static void (*exitfuncs[NEXITFUNCS])(void); static int nexitfuncs = 0; int Py_AtExit(void (*func)(void)) { if (nexitfuncs >= NEXITFUNCS) return -1; exitfuncs[nexitfuncs++] = func; return 0; } static void call_sys_exitfunc(void) { PyObject *exitfunc = PySys_GetObject("exitfunc"); if (exitfunc) { PyObject *res; Py_INCREF(exitfunc); PySys_SetObject("exitfunc", (PyObject *)NULL); res = PyEval_CallObject(exitfunc, (PyObject *)NULL); if (res == NULL) { if (!PyErr_ExceptionMatches(PyExc_SystemExit)) { PySys_WriteStderr("Error in sys.exitfunc:\n"); } PyErr_Print(); } Py_DECREF(exitfunc); } if (Py_FlushLine()) PyErr_Clear(); } static void call_ll_exitfuncs(void) { while (nexitfuncs > 0) (*exitfuncs[--nexitfuncs])(); fflush(stdout); fflush(stderr); } void Py_Exit(int sts) { Py_Finalize(); exit(sts); } static void initsigs(void) { #ifdef SIGPIPE PyOS_setsig(SIGPIPE, SIG_IGN); #endif #ifdef SIGXFZ PyOS_setsig(SIGXFZ, SIG_IGN); #endif #ifdef SIGXFSZ PyOS_setsig(SIGXFSZ, SIG_IGN); #endif PyOS_InitInterrupts(); /* May imply initsignal() */ } /* * The file descriptor fd is considered ``interactive'' if either * a) isatty(fd) is TRUE, or * b) the -i flag was given, and the filename associated with * the descriptor is NULL or "" or "???". */ int Py_FdIsInteractive(FILE *fp, const char *filename) { if (isatty((int)fileno(fp))) return 1; if (!Py_InteractiveFlag) return 0; return (filename == NULL) || (strcmp(filename, "") == 0) || (strcmp(filename, "???") == 0); } #if defined(USE_STACKCHECK) #if defined(WIN32) && defined(_MSC_VER) /* Stack checking for Microsoft C */ #include #include /* * Return non-zero when we run out of memory on the stack; zero otherwise. */ int PyOS_CheckStack(void) { __try { /* alloca throws a stack overflow exception if there's not enough space left on the stack */ alloca(PYOS_STACK_MARGIN * sizeof(void*)); return 0; } __except (GetExceptionCode() == STATUS_STACK_OVERFLOW ? EXCEPTION_EXECUTE_HANDLER : EXCEPTION_CONTINUE_SEARCH) { int errcode = _resetstkoflw(); if (errcode == 0) { Py_FatalError("Could not reset the stack!"); } } return 1; } #endif /* WIN32 && _MSC_VER */ /* Alternate implementations can be added here... */ #endif /* USE_STACKCHECK */ /* Wrappers around sigaction() or signal(). */ PyOS_sighandler_t PyOS_getsig(int sig) { #ifdef HAVE_SIGACTION struct sigaction context; if (sigaction(sig, NULL, &context) == -1) return SIG_ERR; return context.sa_handler; #else PyOS_sighandler_t handler; /* Special signal handling for the secure CRT in Visual Studio 2005 */ #if defined(_MSC_VER) && _MSC_VER >= 1400 switch (sig) { /* Only these signals are valid */ case SIGINT: case SIGILL: case SIGFPE: case SIGSEGV: case SIGTERM: case SIGBREAK: case SIGABRT: break; /* Don't call signal() with other values or it will assert */ default: return SIG_ERR; } #endif /* _MSC_VER && _MSC_VER >= 1400 */ handler = signal(sig, SIG_IGN); if (handler != SIG_ERR) signal(sig, handler); return handler; #endif } PyOS_sighandler_t PyOS_setsig(int sig, PyOS_sighandler_t handler) { #ifdef HAVE_SIGACTION struct sigaction context, ocontext; context.sa_handler = handler; sigemptyset(&context.sa_mask); context.sa_flags = 0; if (sigaction(sig, &context, &ocontext) == -1) return SIG_ERR; return ocontext.sa_handler; #else PyOS_sighandler_t oldhandler; oldhandler = signal(sig, handler); #ifdef HAVE_SIGINTERRUPT siginterrupt(sig, 1); #endif return oldhandler; #endif } /* Deprecated C API functions still provided for binary compatiblity */ #undef PyParser_SimpleParseFile PyAPI_FUNC(node *) PyParser_SimpleParseFile(FILE *fp, const char *filename, int start) { return PyParser_SimpleParseFileFlags(fp, filename, start, 0); } #undef PyParser_SimpleParseString PyAPI_FUNC(node *) PyParser_SimpleParseString(const char *str, int start) { return PyParser_SimpleParseStringFlags(str, start, 0); } #undef PyRun_AnyFile PyAPI_FUNC(int) PyRun_AnyFile(FILE *fp, const char *name) { return PyRun_AnyFileExFlags(fp, name, 0, NULL); } #undef PyRun_AnyFileEx PyAPI_FUNC(int) PyRun_AnyFileEx(FILE *fp, const char *name, int closeit) { return PyRun_AnyFileExFlags(fp, name, closeit, NULL); } #undef PyRun_AnyFileFlags PyAPI_FUNC(int) PyRun_AnyFileFlags(FILE *fp, const char *name, PyCompilerFlags *flags) { return PyRun_AnyFileExFlags(fp, name, 0, flags); } #undef PyRun_File PyAPI_FUNC(PyObject *) PyRun_File(FILE *fp, const char *p, int s, PyObject *g, PyObject *l) { return PyRun_FileExFlags(fp, p, s, g, l, 0, NULL); } #undef PyRun_FileEx PyAPI_FUNC(PyObject *) PyRun_FileEx(FILE *fp, const char *p, int s, PyObject *g, PyObject *l, int c) { return PyRun_FileExFlags(fp, p, s, g, l, c, NULL); } #undef PyRun_FileFlags PyAPI_FUNC(PyObject *) PyRun_FileFlags(FILE *fp, const char *p, int s, PyObject *g, PyObject *l, PyCompilerFlags *flags) { return PyRun_FileExFlags(fp, p, s, g, l, 0, flags); } #undef PyRun_SimpleFile PyAPI_FUNC(int) PyRun_SimpleFile(FILE *f, const char *p) { return PyRun_SimpleFileExFlags(f, p, 0, NULL); } #undef PyRun_SimpleFileEx PyAPI_FUNC(int) PyRun_SimpleFileEx(FILE *f, const char *p, int c) { return PyRun_SimpleFileExFlags(f, p, c, NULL); } #undef PyRun_String PyAPI_FUNC(PyObject *) PyRun_String(const char *str, int s, PyObject *g, PyObject *l) { return PyRun_StringFlags(str, s, g, l, NULL); } #undef PyRun_SimpleString PyAPI_FUNC(int) PyRun_SimpleString(const char *s) { return PyRun_SimpleStringFlags(s, NULL); } #undef Py_CompileString PyAPI_FUNC(PyObject *) Py_CompileString(const char *str, const char *p, int s) { return Py_CompileStringFlags(str, p, s, NULL); } #undef PyRun_InteractiveOne PyAPI_FUNC(int) PyRun_InteractiveOne(FILE *f, const char *p) { return PyRun_InteractiveOneFlags(f, p, NULL); } #undef PyRun_InteractiveLoop PyAPI_FUNC(int) PyRun_InteractiveLoop(FILE *f, const char *p) { return PyRun_InteractiveLoopFlags(f, p, NULL); } #ifdef __cplusplus } #endif n279' href='#n279'>279 280 281 282 283 284 285 286 287 288 289 290 291 292 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/* 
 * 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.
 *
 * 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 1.20.2.3 2006/11/28 22:20:02 andreas_kupries Exp $
 */

#include "tclInt.h"
#include "tclPort.h"
#include <stdio.h>

/*
 * Counter for how many aliases were created (global)
 */

static int aliasCounter = 0;
TCL_DECLARE_MUTEX(cntMutex)

/*
 * 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 *namePtr;		/* Name of alias command in slave interp. */
    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. */
    Tcl_HashEntry *targetEntryPtr;
				/* 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. Random access to this
                                 * hash table is never required - we are using
                                 * a hash table only for convenience. */
    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 (in the targetTable hashtable, see below) 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.
 */

typedef struct Target {
    Tcl_Command	slaveCmd;	/* Command for alias in slave interp. */
    Tcl_Interp *slaveInterp;	/* Slave Interpreter. */
} 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 targetTable hashtable).
 * 
 * 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. */
    Tcl_HashTable targetTable;	/* Hash table for Target Records. Contains
                                 * all Target records which denote aliases
                                 * from slaves or sibling interpreters that
                                 * direct to commands in this interpreter. This
                                 * table 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;

/*
 * Prototypes for local static procedures:
 */

static int		AliasCreate _ANSI_ARGS_((Tcl_Interp *interp,
			    Tcl_Interp *slaveInterp, Tcl_Interp *masterInterp,
			    Tcl_Obj *namePtr, Tcl_Obj *targetPtr, int objc,
			    Tcl_Obj *CONST objv[]));
static int		AliasDelete _ANSI_ARGS_((Tcl_Interp *interp,
			    Tcl_Interp *slaveInterp, Tcl_Obj *namePtr));
static int		AliasDescribe _ANSI_ARGS_((Tcl_Interp *interp,
			    Tcl_Interp *slaveInterp, Tcl_Obj *objPtr));
static int		AliasList _ANSI_ARGS_((Tcl_Interp *interp,
		            Tcl_Interp *slaveInterp));
static int		AliasObjCmd _ANSI_ARGS_((ClientData dummy,
			    Tcl_Interp *currentInterp, int objc,
		            Tcl_Obj *CONST objv[]));
static void		AliasObjCmdDeleteProc _ANSI_ARGS_((
			    ClientData clientData));

static Tcl_Interp *	GetInterp _ANSI_ARGS_((Tcl_Interp *interp,
			    Tcl_Obj *pathPtr));
static Tcl_Interp *	GetInterp2 _ANSI_ARGS_((Tcl_Interp *interp, int objc,
			    Tcl_Obj *CONST objv[]));
static void		InterpInfoDeleteProc _ANSI_ARGS_((
			    ClientData clientData, Tcl_Interp *interp));
static Tcl_Interp *	SlaveCreate _ANSI_ARGS_((Tcl_Interp *interp,
		            Tcl_Obj *pathPtr, int safe));
static int		SlaveEval _ANSI_ARGS_((Tcl_Interp *interp,
			    Tcl_Interp *slaveInterp, int objc,
			    Tcl_Obj *CONST objv[]));
static int		SlaveExpose _ANSI_ARGS_((Tcl_Interp *interp,
			    Tcl_Interp *slaveInterp, int objc,
			    Tcl_Obj *CONST objv[]));
static int		SlaveHide _ANSI_ARGS_((Tcl_Interp *interp,
			    Tcl_Interp *slaveInterp, int objc,
			    Tcl_Obj *CONST objv[]));
static int		SlaveHidden _ANSI_ARGS_((Tcl_Interp *interp,
			    Tcl_Interp *slaveInterp));
static int		SlaveInvokeHidden _ANSI_ARGS_((Tcl_Interp *interp,
			    Tcl_Interp *slaveInterp, int global, int objc,
			    Tcl_Obj *CONST objv[]));
static int		SlaveMarkTrusted _ANSI_ARGS_((Tcl_Interp *interp,
			    Tcl_Interp *slaveInterp));
static int		SlaveObjCmd _ANSI_ARGS_((ClientData dummy,
			    Tcl_Interp *interp, int objc,
			    Tcl_Obj *CONST objv[]));
static void		SlaveObjCmdDeleteProc _ANSI_ARGS_((
			    ClientData clientData));
static int		SlaveRecursionLimit _ANSI_ARGS_((Tcl_Interp *interp,
			    Tcl_Interp *slaveInterp, int objc,
			    Tcl_Obj *CONST objv[]));


/*
 *---------------------------------------------------------------------------
 *
 * 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(interp)
    Tcl_Interp *interp;			/* Interpreter to initialize. */
{
    InterpInfo *interpInfoPtr;
    Master *masterPtr;
    Slave *slavePtr;	

    interpInfoPtr = (InterpInfo *) ckalloc(sizeof(InterpInfo));
    ((Interp *) interp)->interpInfo = (ClientData) interpInfoPtr;

    masterPtr = &interpInfoPtr->master;
    Tcl_InitHashTable(&masterPtr->slaveTable, TCL_STRING_KEYS);
    Tcl_InitHashTable(&masterPtr->targetTable, TCL_ONE_WORD_KEYS);

    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, interp)
    ClientData clientData;	/* Ignored. */
    Tcl_Interp *interp;		/* Interp being deleted.  All commands for
				 * slave interps should already be deleted. */
{
    InterpInfo *interpInfoPtr;
    Slave *slavePtr;
    Master *masterPtr;
    Tcl_HashSearch hSearch;
    Tcl_HashEntry *hPtr;
    Target *targetPtr;

    interpInfoPtr = (InterpInfo *) ((Interp *) interp)->interpInfo;

    /*
     * There shouldn't be any commands left.
     */

    masterPtr = &interpInfoPtr->master;
    if (masterPtr->slaveTable.numEntries != 0) {
	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. 
     */

    hPtr = Tcl_FirstHashEntry(&masterPtr->targetTable, &hSearch);
    while (hPtr != NULL) {
	targetPtr = (Target *) Tcl_GetHashValue(hPtr);
	Tcl_DeleteCommandFromToken(targetPtr->slaveInterp,
		targetPtr->slaveCmd);
	hPtr = Tcl_NextHashEntry(&hSearch);
    }
    Tcl_DeleteHashTable(&masterPtr->targetTable);

    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) {
	panic("InterpInfoDeleteProc: still exist aliases");
    }
    Tcl_DeleteHashTable(&slavePtr->aliasTable);

    ckfree((char *) interpInfoPtr);    
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_InterpObjCmd --
 *
 *	This procedure 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, interp, objc, objv)
    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",	"create",	"delete", 
	"eval",		"exists",	"expose",	"hide", 
	"hidden",	"issafe",	"invokehidden",	"marktrusted", 
	"recursionlimit",		"slaves",	"share",
	"target",	"transfer",
        NULL
    };
    enum option {
	OPT_ALIAS,	OPT_ALIASES,	OPT_CREATE,	OPT_DELETE,
	OPT_EVAL,	OPT_EXISTS,	OPT_EXPOSE,	OPT_HIDE,
	OPT_HIDDEN,	OPT_ISSAFE,	OPT_INVOKEHID,	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 == (Tcl_Interp *) NULL) {
		return TCL_ERROR;
	    }
	    if (objc == 4) {
		return AliasDescribe(interp, slaveInterp, objv[3]);
	    }
	    if ((objc == 5) && (Tcl_GetString(objv[4])[0] == '\0')) {
		return AliasDelete(interp, slaveInterp, objv[3]);
	    }
	    if (objc > 5) {
		masterInterp = GetInterp(interp, objv[4]);
		if (masterInterp == (Tcl_Interp *) NULL) {
		    return TCL_ERROR;
		}
		if (Tcl_GetString(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_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_ResetResult(interp);
		    Tcl_AppendStringsToObj(Tcl_GetObjResult(interp),
			    "cannot delete the current interpreter",
			    (char *) NULL);
		    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_SetIntObj(Tcl_GetObjResult(interp), 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 == (Tcl_Interp *) 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_SetIntObj(Tcl_GetObjResult(interp), Tcl_IsSafe(slaveInterp));
	    return TCL_OK;
	}
	case OPT_INVOKEHID: {
	    int i, index, global;
	    Tcl_Interp *slaveInterp;
	    static CONST char *hiddenOptions[] = {
		"-global",	"--",		NULL
	    };
	    enum hiddenOption {
		OPT_GLOBAL,	OPT_LAST
	    };

	    global = 0;
	    for (i = 3; i < objc; i++) {
		if (Tcl_GetString(objv[i])[0] != '-') {
		    break;
		}
		if (Tcl_GetIndexFromObj(interp, objv[i], hiddenOptions,
			"option", 0, &index) != TCL_OK) {
		    return TCL_ERROR;
		}
		if (index == OPT_GLOBAL) {
		    global = 1;
		} else {
		    i++;
		    break;
		}
	    }
	    if (objc - i < 1) {
		Tcl_WrongNumArgs(interp, 2, objv,
			"path ?-global? ?--? cmd ?arg ..?");
		return TCL_ERROR;
	    }
	    slaveInterp = GetInterp(interp, objv[2]);
	    if (slaveInterp == (Tcl_Interp *) NULL) {
		return TCL_ERROR;
	    }
	    return SlaveInvokeHidden(interp, slaveInterp, global, objc - i,
		    objv + i);
	}
	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_GetObjResult(interp);
	    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));
	    }
	    return TCL_OK;
	}
	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, Tcl_GetString(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);
	    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 = Tcl_GetString(objv[3]);

	    iiPtr = (InterpInfo *) ((Interp *) slaveInterp)->interpInfo;
	    hPtr = Tcl_FindHashEntry(&iiPtr->slave.aliasTable, aliasName);
	    if (hPtr == NULL) {
		Tcl_AppendStringsToObj(Tcl_GetObjResult(interp),
			"alias \"", aliasName, "\" in path \"",
			Tcl_GetString(objv[2]), "\" not found",
			(char *) NULL);
		return TCL_ERROR;
	    }
	    aliasPtr = (Alias *) Tcl_GetHashValue(hPtr);
	    if (Tcl_GetInterpPath(interp, aliasPtr->targetInterp) != TCL_OK) {
		Tcl_ResetResult(interp);
		Tcl_AppendStringsToObj(Tcl_GetObjResult(interp),
			"target interpreter for alias \"", aliasName,
			"\" in path \"", Tcl_GetString(objv[2]),
			"\" is not my descendant", (char *) NULL);
		return TCL_ERROR;
	    }
	    return TCL_OK;
	}
	case OPT_TRANSFER: {
	    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, Tcl_GetString(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 (Tcl_UnregisterChannel(masterInterp, chan) != TCL_OK) {
		TclTransferResult(masterInterp, TCL_OK, interp);
		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(interp, objc, objv)
    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(slaveInterp, slaveCmd, targetInterp, targetCmd, argc, argv)
    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 **) ckalloc((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]);
    }
    ckfree((char *) 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(slaveInterp, slaveCmd, targetInterp, targetCmd, objc, objv)
    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(interp, aliasName, targetInterpPtr, targetNamePtr, argcPtr,
        argvPtr)
    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;
    Tcl_HashEntry *hPtr;
    Alias *aliasPtr;
    int i, objc;
    Tcl_Obj **objv;
    
    iiPtr = (InterpInfo *) ((Interp *) interp)->interpInfo;
    hPtr = Tcl_FindHashEntry(&iiPtr->slave.aliasTable, aliasName);
    if (hPtr == NULL) {
        Tcl_AppendStringsToObj(Tcl_GetObjResult(interp),
                "alias \"", aliasName, "\" not found", (char *) NULL);
	return TCL_ERROR;
    }
    aliasPtr = (Alias *) Tcl_GetHashValue(hPtr);
    objc = aliasPtr->objc;
    objv = &aliasPtr->objPtr;

    if (targetInterpPtr != NULL) {
	*targetInterpPtr = aliasPtr->targetInterp;
    }
    if (targetNamePtr != NULL) {
	*targetNamePtr = Tcl_GetString(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] = Tcl_GetString(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(interp, aliasName, targetInterpPtr, targetNamePtr, objcPtr,
        objvPtr)
    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;
    Tcl_HashEntry *hPtr;
    Alias *aliasPtr;	
    int objc;
    Tcl_Obj **objv;

    iiPtr = (InterpInfo *) ((Interp *) interp)->interpInfo;
    hPtr = Tcl_FindHashEntry(&iiPtr->slave.aliasTable, aliasName);
    if (hPtr == (Tcl_HashEntry *) NULL) {
        Tcl_AppendStringsToObj(Tcl_GetObjResult(interp),
                "alias \"", aliasName, "\" not found", (char *) NULL);
        return TCL_ERROR;
    }
    aliasPtr = (Alias *) Tcl_GetHashValue(hPtr);
    objc = aliasPtr->objc;
    objv = &aliasPtr->objPtr;

    if (targetInterpPtr != (Tcl_Interp **) NULL) {
        *targetInterpPtr = aliasPtr->targetInterp;
    }
    if (targetNamePtr != (CONST char **) NULL) {
        *targetNamePtr = Tcl_GetString(objv[0]);
    }
    if (objcPtr != (int *) NULL) {
        *objcPtr = objc - 1;
    }
    if (objvPtr != (Tcl_Obj ***) 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(interp, cmdInterp, cmd)
    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_AppendStringsToObj(Tcl_GetObjResult(interp),
		    "cannot define or rename alias \"",
		    Tcl_GetString(aliasPtr->namePtr),
		    "\": interpreter deleted", (char *) NULL);
	    return TCL_ERROR;
	}
	cmdNamePtr = nextAliasPtr->objPtr;
	aliasCmd = Tcl_FindCommand(nextAliasPtr->targetInterp,
                Tcl_GetString(cmdNamePtr),
		Tcl_GetGlobalNamespace(nextAliasPtr->targetInterp),
		/*flags*/ 0);
        if (aliasCmd == (Tcl_Command) NULL) {
            return TCL_OK;
        }
	aliasCmdPtr = (Command *) aliasCmd;
        if (aliasCmdPtr == cmdPtr) {
            Tcl_AppendStringsToObj(Tcl_GetObjResult(interp),
		    "cannot define or rename alias \"",
		    Tcl_GetString(aliasPtr->namePtr),
		    "\": would create a loop", (char *) 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(interp, slaveInterp, masterInterp, namePtr, targetNamePtr,
	objc, objv)
    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 new, i;

    aliasPtr = (Alias *) ckalloc((unsigned) (sizeof(Alias) 
            + objc * sizeof(Tcl_Obj *)));
    aliasPtr->namePtr		= namePtr;
    Tcl_IncrRefCount(aliasPtr->namePtr);
    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,
	    Tcl_GetString(namePtr), AliasObjCmd, (ClientData) 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->namePtr);
	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 delete
     * the alias command. Then retry.
     */

    slavePtr = &((InterpInfo *) ((Interp *) slaveInterp)->interpInfo)->slave;
    while (1) {
	Alias *oldAliasPtr;
	char *string;
	
	string = Tcl_GetString(namePtr);
	hPtr = Tcl_CreateHashEntry(&slavePtr->aliasTable, string, &new);
	if (new != 0) {
	    break;
	}

	oldAliasPtr = (Alias *) Tcl_GetHashValue(hPtr);
	Tcl_DeleteCommandFromToken(slaveInterp, oldAliasPtr->slaveCmd);
    }

    aliasPtr->aliasEntryPtr = hPtr;
    Tcl_SetHashValue(hPtr, (ClientData) 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;

    Tcl_MutexLock(&cntMutex);
    masterPtr = &((InterpInfo *) ((Interp *) masterInterp)->interpInfo)->master;
    do {
        hPtr = Tcl_CreateHashEntry(&masterPtr->targetTable,
                (char *) aliasCounter, &new);
	aliasCounter++;
    } while (new == 0);
    Tcl_MutexUnlock(&cntMutex);

    Tcl_SetHashValue(hPtr, (ClientData) targetPtr);
    aliasPtr->targetEntryPtr = hPtr;

    Tcl_SetObjResult(interp, namePtr);

    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(interp, slaveInterp, namePtr)
    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, Tcl_GetString(namePtr));
    if (hPtr == NULL) {
	Tcl_AppendStringsToObj(Tcl_GetObjResult(interp), "alias \"",
		Tcl_GetString(namePtr), "\" not found", NULL);
        return TCL_ERROR;
    }
    aliasPtr = (Alias *) 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(interp, slaveInterp, namePtr)
    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 = (Alias *) 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(interp, slaveInterp)
    Tcl_Interp *interp;		/* Interp for data return. */
    Tcl_Interp *slaveInterp;	/* Interp whose aliases to compute. */
{
    Tcl_HashEntry *entryPtr;
    Tcl_HashSearch hashSearch;
    Tcl_Obj *resultPtr;	
    Alias *aliasPtr;
    Slave *slavePtr;

    slavePtr = &((InterpInfo *) ((Interp *) slaveInterp)->interpInfo)->slave;
    resultPtr = Tcl_GetObjResult(interp);

    entryPtr = Tcl_FirstHashEntry(&slavePtr->aliasTable, &hashSearch);
    for ( ; entryPtr != NULL; entryPtr = Tcl_NextHashEntry(&hashSearch)) {
        aliasPtr = (Alias *) Tcl_GetHashValue(entryPtr);
        Tcl_ListObjAppendElement(NULL, resultPtr, aliasPtr->namePtr);
    }
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * AliasObjCmd --
 *
 *	This is the procedure that services invocations of aliases in a
 *	slave interpreter. One such command exists for each alias. When
 *	invoked, this procedure 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, interp, objc, objv)
    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
    Tcl_Interp *targetInterp;	
    Alias *aliasPtr;		
    int result, prefc, cmdc, i;
    Tcl_Obj **prefv, **cmdv;
    Tcl_Obj *cmdArr[ALIAS_CMDV_PREALLOC];
    aliasPtr = (Alias *) clientData;
    targetInterp = aliasPtr->targetInterp;

    /*
     * 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 **) ckalloc((unsigned) (cmdc * sizeof(Tcl_Obj *)));
    }

    prefv = &aliasPtr->objPtr;
    memcpy((VOID *) cmdv, (VOID *) prefv, 
            (size_t) (prefc * sizeof(Tcl_Obj *)));
    memcpy((VOID *) (cmdv+prefc), (VOID *) (objv+1), 
	    (size_t) ((objc-1) * sizeof(Tcl_Obj *)));

    Tcl_ResetResult(targetInterp);

    for (i=0; i<cmdc; i++) {
	Tcl_IncrRefCount(cmdv[i]);
    }
    if (targetInterp != interp) {
	Tcl_Preserve((ClientData) targetInterp);
	result = Tcl_EvalObjv(targetInterp, cmdc, cmdv, TCL_EVAL_INVOKE);
	TclTransferResult(targetInterp, result, interp);	
	Tcl_Release((ClientData) targetInterp);
    } else {
	result = Tcl_EvalObjv(targetInterp, cmdc, cmdv, TCL_EVAL_INVOKE);
    }
    for (i=0; i<cmdc; i++) {
	Tcl_DecrRefCount(cmdv[i]);
    }

    if (cmdv != cmdArr) {
	ckfree((char *) 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 clientData;	/* The alias record for this alias. */
{
    Alias *aliasPtr;		
    Target *targetPtr;		
    int i;
    Tcl_Obj **objv;

    aliasPtr = (Alias *) clientData;
    
    Tcl_DecrRefCount(aliasPtr->namePtr);
    objv = &aliasPtr->objPtr;
    for (i = 0; i < aliasPtr->objc; i++) {
	Tcl_DecrRefCount(objv[i]);
    }
    Tcl_DeleteHashEntry(aliasPtr->aliasEntryPtr);

    targetPtr = (Target *) Tcl_GetHashValue(aliasPtr->targetEntryPtr);
    ckfree((char *) targetPtr);
    Tcl_DeleteHashEntry(aliasPtr->targetEntryPtr);

    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(interp, slavePath, isSafe)
    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(interp, slavePath)
    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(interp)
    Tcl_Interp *interp;		/* Get the master of this interpreter. */
{
    Slave *slavePtr;		/* Slave record of this interpreter. */

    if (interp == (Tcl_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(askingInterp, targetInterp)
    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(interp, pathPtr)
    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 (Tcl_ListObjGetElements(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,
		Tcl_GetString(objv[i]));
        if (hPtr == NULL) {
	    searchInterp = NULL;
	    break;
	}
        slavePtr = (Slave *) Tcl_GetHashValue(hPtr);
        searchInterp = slavePtr->slaveInterp;
        if (searchInterp == NULL) {
	    break;
	}
    }
    if (searchInterp == NULL) {
	Tcl_AppendStringsToObj(Tcl_GetObjResult(interp),
		"could not find interpreter \"",
                Tcl_GetString(pathPtr), "\"", (char *) NULL);
    }
    return searchInterp;
}

/*
 *----------------------------------------------------------------------
 *
 * 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(interp, pathPtr, safe)
    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 new, objc;
    Tcl_Obj **objv;

    if (Tcl_ListObjGetElements(interp, pathPtr, &objc, &objv) != TCL_OK) {
	return NULL;
    }
    if (objc < 2) {
	masterInterp = interp;
	path = Tcl_GetString(pathPtr);
    } else {
	Tcl_Obj *objPtr;
	
	objPtr = Tcl_NewListObj(objc - 1, objv);
	masterInterp = GetInterp(interp, objPtr);
	Tcl_DecrRefCount(objPtr);
	if (masterInterp == NULL) {
	    return NULL;
	}
	path = Tcl_GetString(objv[objc - 1]);
    }
    if (safe == 0) {
	safe = Tcl_IsSafe(masterInterp);
    }

    masterInfoPtr = (InterpInfo *) ((Interp *) masterInterp)->interpInfo;
    hPtr = Tcl_CreateHashEntry(&masterInfoPtr->master.slaveTable, path, &new);
    if (new == 0) {
        Tcl_AppendStringsToObj(Tcl_GetObjResult(interp),
                "interpreter named \"", path,
		"\" already exists, cannot create", (char *) 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, (ClientData) slaveInterp, SlaveObjCmdDeleteProc);
    Tcl_InitHashTable(&slavePtr->aliasTable, TCL_STRING_KEYS);
    Tcl_SetHashValue(hPtr, (ClientData) 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);
    }
    return slaveInterp;

    error:
    TclTransferResult(slaveInterp, TCL_ERROR, interp);
    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, interp, objc, objv)
    ClientData clientData;	/* Slave interpreter. */
    Tcl_Interp *interp;		/* Current interpreter. */
    int objc;			/* Number of arguments. */
    Tcl_Obj *CONST objv[];	/* Argument objects. */
{
    Tcl_Interp *slaveInterp;
    int index;
    static CONST char *options[] = {
        "alias",	"aliases",	"eval",		"expose",
        "hide",		"hidden",	"issafe",	"invokehidden",
        "marktrusted",	"recursionlimit", NULL
    };
    enum options {
	OPT_ALIAS,	OPT_ALIASES,	OPT_EVAL,	OPT_EXPOSE,
	OPT_HIDE,	OPT_HIDDEN,	OPT_ISSAFE,	OPT_INVOKEHIDDEN,
	OPT_MARKTRUSTED, OPT_RECLIMIT
    };
    
    slaveInterp = (Tcl_Interp *) clientData;
    if (slaveInterp == NULL) {
	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 (Tcl_GetString(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, (char *) NULL);
		return TCL_ERROR;
	    }
	    return AliasList(interp, slaveInterp);
	}
	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, (char *) NULL);
		return TCL_ERROR;
	    }
	    Tcl_SetIntObj(Tcl_GetObjResult(interp), Tcl_IsSafe(slaveInterp));
	    return TCL_OK;
	}
        case OPT_INVOKEHIDDEN: {
	    int global, i, index;
	    static CONST char *hiddenOptions[] = {
		"-global",	"--",		NULL
	    };
	    enum hiddenOption {
		OPT_GLOBAL,	OPT_LAST
	    };
	    global = 0;
	    for (i = 2; i < objc; i++) {
		if (Tcl_GetString(objv[i])[0] != '-') {
		    break;
		}
		if (Tcl_GetIndexFromObj(interp, objv[i], hiddenOptions,
			"option", 0, &index) != TCL_OK) {
		    return TCL_ERROR;
		}
		if (index == OPT_GLOBAL) {
		    global = 1;
		} else {
		    i++;
		    break;
		}
	    }
	    if (objc - i < 1) {
		Tcl_WrongNumArgs(interp, 2, objv,
			"?-global? ?--? cmd ?arg ..?");
		return TCL_ERROR;
	    }
	    return SlaveInvokeHidden(interp, slaveInterp, global, objc - i,
		    objv + i);
	}
	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 clientData;		/* The SlaveRecord for the command. */
{
    Slave *slavePtr;			/* Interim storage for Slave record. */
    Tcl_Interp *slaveInterp;		/* And for a slave interp. */

    slaveInterp = (Tcl_Interp *) clientData;
    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(interp, slaveInterp, objc, objv)
    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((ClientData) slaveInterp);
    Tcl_AllowExceptions(slaveInterp);

    if (objc == 1) {
#ifndef TCL_TIP280
	result = Tcl_EvalObjEx(slaveInterp, objv[0], 0);
#else
        /* TIP #280 : Make invoker available to eval'd script */
        Interp* iPtr = (Interp*) interp;
	result = TclEvalObjEx(slaveInterp, objv[0], 0, iPtr->cmdFramePtr,0);
#endif
    } else {
	objPtr = Tcl_ConcatObj(objc, objv);
	Tcl_IncrRefCount(objPtr);
	result = Tcl_EvalObjEx(slaveInterp, objPtr, 0);
	Tcl_DecrRefCount(objPtr);
    }
    TclTransferResult(slaveInterp, result, interp);

    Tcl_Release((ClientData) 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(interp, slaveInterp, objc, objv)
    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_AppendStringsToObj(Tcl_GetObjResult(interp),
		"permission denied: safe interpreter cannot expose commands",
		(char *) NULL);
	return TCL_ERROR;
    }

    name = Tcl_GetString(objv[(objc == 1) ? 0 : 1]);
    if (Tcl_ExposeCommand(slaveInterp, Tcl_GetString(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(interp, slaveInterp, objc, objv)
    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_AppendStringsToObj(Tcl_GetObjResult(interp),
		    "permission denied: ",
		    "safe interpreters cannot change recursion limit",
		    (char *) NULL);
	    return TCL_ERROR;
	}
	if (Tcl_GetIntFromObj(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(interp, slaveInterp, objc, objv)
    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_AppendStringsToObj(Tcl_GetObjResult(interp),
		"permission denied: safe interpreter cannot hide commands",
		(char *) NULL);
	return TCL_ERROR;
    }

    name = Tcl_GetString(objv[(objc == 1) ? 0 : 1]);
    if (Tcl_HideCommand(slaveInterp, Tcl_GetString(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(interp, slaveInterp)
    Tcl_Interp *interp;		/* Interp for data return. */
    Tcl_Interp *slaveInterp;	/* Interp whose hidden commands to query. */
{
    Tcl_Obj *listObjPtr;		/* Local object pointer. */
    Tcl_HashTable *hTblPtr;		/* For local searches. */
    Tcl_HashEntry *hPtr;		/* For local searches. */
    Tcl_HashSearch hSearch;		/* For local searches. */
    
    listObjPtr = Tcl_GetObjResult(interp);
    hTblPtr = ((Interp *) slaveInterp)->hiddenCmdTablePtr;
    if (hTblPtr != (Tcl_HashTable *) NULL) {
	for (hPtr = Tcl_FirstHashEntry(hTblPtr, &hSearch);
	     hPtr != (Tcl_HashEntry *) NULL;
	     hPtr = Tcl_NextHashEntry(&hSearch)) {

	    Tcl_ListObjAppendElement(NULL, listObjPtr,
		    Tcl_NewStringObj(Tcl_GetHashKey(hTblPtr, hPtr), -1));
	}
    }
    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(interp, slaveInterp, global, objc, objv)
    Tcl_Interp *interp;		/* Interp for error return. */
    Tcl_Interp *slaveInterp;	/* The slave interpreter in which command
				 * will be invoked. */
    int global;			/* Non-zero to invoke in global namespace. */
    int objc;			/* Number of arguments. */
    Tcl_Obj *CONST objv[];	/* Argument objects. */
{
    int result;
    
    if (Tcl_IsSafe(interp)) {
	Tcl_SetStringObj(Tcl_GetObjResult(interp),
		"not allowed to invoke hidden commands from safe interpreter",
		-1);
	return TCL_ERROR;
    }

    Tcl_Preserve((ClientData) slaveInterp);
    Tcl_AllowExceptions(slaveInterp);
    
    if (global) {
        result = TclObjInvokeGlobal(slaveInterp, objc, objv,
                TCL_INVOKE_HIDDEN);
    } else {
        result = TclObjInvoke(slaveInterp, objc, objv, TCL_INVOKE_HIDDEN);
    }

    TclTransferResult(slaveInterp, result, interp);

    Tcl_Release((ClientData) 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(interp, slaveInterp)
    Tcl_Interp *interp;		/* Interp for error return. */
    Tcl_Interp *slaveInterp;	/* The slave interpreter which will be
				 * marked trusted. */
{
    if (Tcl_IsSafe(interp)) {
	Tcl_AppendStringsToObj(Tcl_GetObjResult(interp),
		"permission denied: safe interpreter cannot mark trusted",
		(char *) NULL);
	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(interp)
    Tcl_Interp *interp;		/* Is this interpreter "safe" ? */
{
    Interp *iPtr;

    if (interp == (Tcl_Interp *) NULL) {
        return 0;
    }
    iPtr = (Interp *) interp;

    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(interp)
    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 != (Tcl_Channel) NULL) {
        Tcl_UnregisterChannel(interp, chan);
    }
    chan = Tcl_GetStdChannel(TCL_STDOUT);
    if (chan != (Tcl_Channel) NULL) {
        Tcl_UnregisterChannel(interp, chan);
    }
    chan = Tcl_GetStdChannel(TCL_STDERR);
    if (chan != (Tcl_Channel) NULL) {
        Tcl_UnregisterChannel(interp, chan);
    }

    return TCL_OK;
}
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