sysmodule.c revision d32ed6f5117a68037e9cb7bcfd8d0f8d1611f442
1 2/* System module */ 3 4/* 5Various bits of information used by the interpreter are collected in 6module 'sys'. 7Function member: 8- exit(sts): raise SystemExit 9Data members: 10- stdin, stdout, stderr: standard file objects 11- modules: the table of modules (dictionary) 12- path: module search path (list of strings) 13- argv: script arguments (list of strings) 14- ps1, ps2: optional primary and secondary prompts (strings) 15*/ 16 17#include "Python.h" 18#include "structseq.h" 19#include "code.h" 20#include "frameobject.h" 21#include "eval.h" 22 23#include "osdefs.h" 24 25#ifdef MS_WINDOWS 26#define WIN32_LEAN_AND_MEAN 27#include <windows.h> 28#endif /* MS_WINDOWS */ 29 30#ifdef MS_COREDLL 31extern void *PyWin_DLLhModule; 32/* A string loaded from the DLL at startup: */ 33extern const char *PyWin_DLLVersionString; 34#endif 35 36#ifdef __VMS 37#include <unixlib.h> 38#endif 39 40#ifdef HAVE_LANGINFO_H 41#include <locale.h> 42#include <langinfo.h> 43#endif 44 45PyObject * 46PySys_GetObject(const char *name) 47{ 48 PyThreadState *tstate = PyThreadState_GET(); 49 PyObject *sd = tstate->interp->sysdict; 50 if (sd == NULL) 51 return NULL; 52 return PyDict_GetItemString(sd, name); 53} 54 55int 56PySys_SetObject(const char *name, PyObject *v) 57{ 58 PyThreadState *tstate = PyThreadState_GET(); 59 PyObject *sd = tstate->interp->sysdict; 60 if (v == NULL) { 61 if (PyDict_GetItemString(sd, name) == NULL) 62 return 0; 63 else 64 return PyDict_DelItemString(sd, name); 65 } 66 else 67 return PyDict_SetItemString(sd, name, v); 68} 69 70static PyObject * 71sys_displayhook(PyObject *self, PyObject *o) 72{ 73 PyObject *outf; 74 PyInterpreterState *interp = PyThreadState_GET()->interp; 75 PyObject *modules = interp->modules; 76 PyObject *builtins = PyDict_GetItemString(modules, "builtins"); 77 78 if (builtins == NULL) { 79 PyErr_SetString(PyExc_RuntimeError, "lost builtins module"); 80 return NULL; 81 } 82 83 /* Print value except if None */ 84 /* After printing, also assign to '_' */ 85 /* Before, set '_' to None to avoid recursion */ 86 if (o == Py_None) { 87 Py_INCREF(Py_None); 88 return Py_None; 89 } 90 if (PyObject_SetAttrString(builtins, "_", Py_None) != 0) 91 return NULL; 92 outf = PySys_GetObject("stdout"); 93 if (outf == NULL || outf == Py_None) { 94 PyErr_SetString(PyExc_RuntimeError, "lost sys.stdout"); 95 return NULL; 96 } 97 if (PyFile_WriteObject(o, outf, 0) != 0) 98 return NULL; 99 if (PyFile_WriteString("\n", outf) != 0) 100 return NULL; 101 if (PyObject_SetAttrString(builtins, "_", o) != 0) 102 return NULL; 103 Py_INCREF(Py_None); 104 return Py_None; 105} 106 107PyDoc_STRVAR(displayhook_doc, 108"displayhook(object) -> None\n" 109"\n" 110"Print an object to sys.stdout and also save it in builtins.\n" 111); 112 113static PyObject * 114sys_excepthook(PyObject* self, PyObject* args) 115{ 116 PyObject *exc, *value, *tb; 117 if (!PyArg_UnpackTuple(args, "excepthook", 3, 3, &exc, &value, &tb)) 118 return NULL; 119 PyErr_Display(exc, value, tb); 120 Py_INCREF(Py_None); 121 return Py_None; 122} 123 124PyDoc_STRVAR(excepthook_doc, 125"excepthook(exctype, value, traceback) -> None\n" 126"\n" 127"Handle an exception by displaying it with a traceback on sys.stderr.\n" 128); 129 130static PyObject * 131sys_exc_info(PyObject *self, PyObject *noargs) 132{ 133 PyThreadState *tstate; 134 tstate = PyThreadState_GET(); 135 return Py_BuildValue( 136 "(OOO)", 137 tstate->exc_type != NULL ? tstate->exc_type : Py_None, 138 tstate->exc_value != NULL ? tstate->exc_value : Py_None, 139 tstate->exc_traceback != NULL ? 140 tstate->exc_traceback : Py_None); 141} 142 143PyDoc_STRVAR(exc_info_doc, 144"exc_info() -> (type, value, traceback)\n\ 145\n\ 146Return information about the most recent exception caught by an except\n\ 147clause in the current stack frame or in an older stack frame." 148); 149 150static PyObject * 151sys_exit(PyObject *self, PyObject *args) 152{ 153 PyObject *exit_code = 0; 154 if (!PyArg_UnpackTuple(args, "exit", 0, 1, &exit_code)) 155 return NULL; 156 /* Raise SystemExit so callers may catch it or clean up. */ 157 PyErr_SetObject(PyExc_SystemExit, exit_code); 158 return NULL; 159} 160 161PyDoc_STRVAR(exit_doc, 162"exit([status])\n\ 163\n\ 164Exit the interpreter by raising SystemExit(status).\n\ 165If the status is omitted or None, it defaults to zero (i.e., success).\n\ 166If the status is numeric, it will be used as the system exit status.\n\ 167If it is another kind of object, it will be printed and the system\n\ 168exit status will be one (i.e., failure)." 169); 170 171 172static PyObject * 173sys_getdefaultencoding(PyObject *self) 174{ 175 return PyUnicode_FromString(PyUnicode_GetDefaultEncoding()); 176} 177 178PyDoc_STRVAR(getdefaultencoding_doc, 179"getdefaultencoding() -> string\n\ 180\n\ 181Return the current default string encoding used by the Unicode \n\ 182implementation." 183); 184 185static PyObject * 186sys_setdefaultencoding(PyObject *self, PyObject *args) 187{ 188 char *encoding; 189 if (!PyArg_ParseTuple(args, "s:setdefaultencoding", &encoding)) 190 return NULL; 191 if (PyUnicode_SetDefaultEncoding(encoding)) 192 return NULL; 193 Py_INCREF(Py_None); 194 return Py_None; 195} 196 197PyDoc_STRVAR(setdefaultencoding_doc, 198"setdefaultencoding(encoding)\n\ 199\n\ 200Set the current default string encoding used by the Unicode implementation." 201); 202 203static PyObject * 204sys_getfilesystemencoding(PyObject *self) 205{ 206 if (Py_FileSystemDefaultEncoding) 207 return PyUnicode_FromString(Py_FileSystemDefaultEncoding); 208 Py_INCREF(Py_None); 209 return Py_None; 210} 211 212PyDoc_STRVAR(getfilesystemencoding_doc, 213"getfilesystemencoding() -> string\n\ 214\n\ 215Return the encoding used to convert Unicode filenames in\n\ 216operating system filenames." 217); 218 219 220 221static PyObject * 222sys_intern(PyObject *self, PyObject *args) 223{ 224 PyObject *s; 225 if (!PyArg_ParseTuple(args, "U:intern", &s)) 226 return NULL; 227 if (PyUnicode_CheckExact(s)) { 228 Py_INCREF(s); 229 PyUnicode_InternInPlace(&s); 230 return s; 231 } 232 else { 233 PyErr_Format(PyExc_TypeError, 234 "can't intern %.400s", s->ob_type->tp_name); 235 return NULL; 236 } 237} 238 239PyDoc_STRVAR(intern_doc, 240"intern(string) -> string\n\ 241\n\ 242``Intern'' the given string. This enters the string in the (global)\n\ 243table of interned strings whose purpose is to speed up dictionary lookups.\n\ 244Return the string itself or the previously interned string object with the\n\ 245same value."); 246 247 248/* 249 * Cached interned string objects used for calling the profile and 250 * trace functions. Initialized by trace_init(). 251 */ 252static PyObject *whatstrings[7] = {NULL, NULL, NULL, NULL, NULL, NULL, NULL}; 253 254static int 255trace_init(void) 256{ 257 static char *whatnames[7] = {"call", "exception", "line", "return", 258 "c_call", "c_exception", "c_return"}; 259 PyObject *name; 260 int i; 261 for (i = 0; i < 7; ++i) { 262 if (whatstrings[i] == NULL) { 263 name = PyUnicode_InternFromString(whatnames[i]); 264 if (name == NULL) 265 return -1; 266 whatstrings[i] = name; 267 } 268 } 269 return 0; 270} 271 272 273static PyObject * 274call_trampoline(PyThreadState *tstate, PyObject* callback, 275 PyFrameObject *frame, int what, PyObject *arg) 276{ 277 PyObject *args = PyTuple_New(3); 278 PyObject *whatstr; 279 PyObject *result; 280 281 if (args == NULL) 282 return NULL; 283 Py_INCREF(frame); 284 whatstr = whatstrings[what]; 285 Py_INCREF(whatstr); 286 if (arg == NULL) 287 arg = Py_None; 288 Py_INCREF(arg); 289 PyTuple_SET_ITEM(args, 0, (PyObject *)frame); 290 PyTuple_SET_ITEM(args, 1, whatstr); 291 PyTuple_SET_ITEM(args, 2, arg); 292 293 /* call the Python-level function */ 294 PyFrame_FastToLocals(frame); 295 result = PyEval_CallObject(callback, args); 296 PyFrame_LocalsToFast(frame, 1); 297 if (result == NULL) 298 PyTraceBack_Here(frame); 299 300 /* cleanup */ 301 Py_DECREF(args); 302 return result; 303} 304 305static int 306profile_trampoline(PyObject *self, PyFrameObject *frame, 307 int what, PyObject *arg) 308{ 309 PyThreadState *tstate = frame->f_tstate; 310 PyObject *result; 311 312 if (arg == NULL) 313 arg = Py_None; 314 result = call_trampoline(tstate, self, frame, what, arg); 315 if (result == NULL) { 316 PyEval_SetProfile(NULL, NULL); 317 return -1; 318 } 319 Py_DECREF(result); 320 return 0; 321} 322 323static int 324trace_trampoline(PyObject *self, PyFrameObject *frame, 325 int what, PyObject *arg) 326{ 327 PyThreadState *tstate = frame->f_tstate; 328 PyObject *callback; 329 PyObject *result; 330 331 if (what == PyTrace_CALL) 332 callback = self; 333 else 334 callback = frame->f_trace; 335 if (callback == NULL) 336 return 0; 337 result = call_trampoline(tstate, callback, frame, what, arg); 338 if (result == NULL) { 339 PyEval_SetTrace(NULL, NULL); 340 Py_XDECREF(frame->f_trace); 341 frame->f_trace = NULL; 342 return -1; 343 } 344 if (result != Py_None) { 345 PyObject *temp = frame->f_trace; 346 frame->f_trace = NULL; 347 Py_XDECREF(temp); 348 frame->f_trace = result; 349 } 350 else { 351 Py_DECREF(result); 352 } 353 return 0; 354} 355 356static PyObject * 357sys_settrace(PyObject *self, PyObject *args) 358{ 359 if (trace_init() == -1) 360 return NULL; 361 if (args == Py_None) 362 PyEval_SetTrace(NULL, NULL); 363 else 364 PyEval_SetTrace(trace_trampoline, args); 365 Py_INCREF(Py_None); 366 return Py_None; 367} 368 369PyDoc_STRVAR(settrace_doc, 370"settrace(function)\n\ 371\n\ 372Set the global debug tracing function. It will be called on each\n\ 373function call. See the debugger chapter in the library manual." 374); 375 376static PyObject * 377sys_setprofile(PyObject *self, PyObject *args) 378{ 379 if (trace_init() == -1) 380 return NULL; 381 if (args == Py_None) 382 PyEval_SetProfile(NULL, NULL); 383 else 384 PyEval_SetProfile(profile_trampoline, args); 385 Py_INCREF(Py_None); 386 return Py_None; 387} 388 389PyDoc_STRVAR(setprofile_doc, 390"setprofile(function)\n\ 391\n\ 392Set the profiling function. It will be called on each function call\n\ 393and return. See the profiler chapter in the library manual." 394); 395 396static PyObject * 397sys_setcheckinterval(PyObject *self, PyObject *args) 398{ 399 if (!PyArg_ParseTuple(args, "i:setcheckinterval", &_Py_CheckInterval)) 400 return NULL; 401 Py_INCREF(Py_None); 402 return Py_None; 403} 404 405PyDoc_STRVAR(setcheckinterval_doc, 406"setcheckinterval(n)\n\ 407\n\ 408Tell the Python interpreter to check for asynchronous events every\n\ 409n instructions. This also affects how often thread switches occur." 410); 411 412static PyObject * 413sys_getcheckinterval(PyObject *self, PyObject *args) 414{ 415 return PyLong_FromLong(_Py_CheckInterval); 416} 417 418PyDoc_STRVAR(getcheckinterval_doc, 419"getcheckinterval() -> current check interval; see setcheckinterval()." 420); 421 422#ifdef WITH_TSC 423static PyObject * 424sys_settscdump(PyObject *self, PyObject *args) 425{ 426 int bool; 427 PyThreadState *tstate = PyThreadState_Get(); 428 429 if (!PyArg_ParseTuple(args, "i:settscdump", &bool)) 430 return NULL; 431 if (bool) 432 tstate->interp->tscdump = 1; 433 else 434 tstate->interp->tscdump = 0; 435 Py_INCREF(Py_None); 436 return Py_None; 437 438} 439 440PyDoc_STRVAR(settscdump_doc, 441"settscdump(bool)\n\ 442\n\ 443If true, tell the Python interpreter to dump VM measurements to\n\ 444stderr. If false, turn off dump. The measurements are based on the\n\ 445processor's time-stamp counter." 446); 447#endif /* TSC */ 448 449static PyObject * 450sys_setrecursionlimit(PyObject *self, PyObject *args) 451{ 452 int new_limit; 453 if (!PyArg_ParseTuple(args, "i:setrecursionlimit", &new_limit)) 454 return NULL; 455 if (new_limit <= 0) { 456 PyErr_SetString(PyExc_ValueError, 457 "recursion limit must be positive"); 458 return NULL; 459 } 460 Py_SetRecursionLimit(new_limit); 461 Py_INCREF(Py_None); 462 return Py_None; 463} 464 465PyDoc_STRVAR(setrecursionlimit_doc, 466"setrecursionlimit(n)\n\ 467\n\ 468Set the maximum depth of the Python interpreter stack to n. This\n\ 469limit prevents infinite recursion from causing an overflow of the C\n\ 470stack and crashing Python. The highest possible limit is platform-\n\ 471dependent." 472); 473 474static PyObject * 475sys_getrecursionlimit(PyObject *self) 476{ 477 return PyLong_FromLong(Py_GetRecursionLimit()); 478} 479 480PyDoc_STRVAR(getrecursionlimit_doc, 481"getrecursionlimit()\n\ 482\n\ 483Return the current value of the recursion limit, the maximum depth\n\ 484of the Python interpreter stack. This limit prevents infinite\n\ 485recursion from causing an overflow of the C stack and crashing Python." 486); 487 488#ifdef MS_WINDOWS 489PyDoc_STRVAR(getwindowsversion_doc, 490"getwindowsversion()\n\ 491\n\ 492Return information about the running version of Windows.\n\ 493The result is a tuple of (major, minor, build, platform, text)\n\ 494All elements are numbers, except text which is a string.\n\ 495Platform may be 0 for win32s, 1 for Windows 9x/ME, 2 for Windows NT/2000/XP\n\ 496" 497); 498 499static PyObject * 500sys_getwindowsversion(PyObject *self) 501{ 502 OSVERSIONINFO ver; 503 ver.dwOSVersionInfoSize = sizeof(ver); 504 if (!GetVersionEx(&ver)) 505 return PyErr_SetFromWindowsErr(0); 506 return Py_BuildValue("HHHHs", 507 ver.dwMajorVersion, 508 ver.dwMinorVersion, 509 ver.dwBuildNumber, 510 ver.dwPlatformId, 511 ver.szCSDVersion); 512} 513 514#endif /* MS_WINDOWS */ 515 516#ifdef HAVE_DLOPEN 517static PyObject * 518sys_setdlopenflags(PyObject *self, PyObject *args) 519{ 520 int new_val; 521 PyThreadState *tstate = PyThreadState_GET(); 522 if (!PyArg_ParseTuple(args, "i:setdlopenflags", &new_val)) 523 return NULL; 524 if (!tstate) 525 return NULL; 526 tstate->interp->dlopenflags = new_val; 527 Py_INCREF(Py_None); 528 return Py_None; 529} 530 531PyDoc_STRVAR(setdlopenflags_doc, 532"setdlopenflags(n) -> None\n\ 533\n\ 534Set the flags that will be used for dlopen() calls. Among other\n\ 535things, this will enable a lazy resolving of symbols when importing\n\ 536a module, if called as sys.setdlopenflags(0)\n\ 537To share symbols across extension modules, call as\n\ 538sys.setdlopenflags(dl.RTLD_NOW|dl.RTLD_GLOBAL)" 539); 540 541static PyObject * 542sys_getdlopenflags(PyObject *self, PyObject *args) 543{ 544 PyThreadState *tstate = PyThreadState_GET(); 545 if (!tstate) 546 return NULL; 547 return PyLong_FromLong(tstate->interp->dlopenflags); 548} 549 550PyDoc_STRVAR(getdlopenflags_doc, 551"getdlopenflags() -> int\n\ 552\n\ 553Return the current value of the flags that are used for dlopen()\n\ 554calls. The flag constants are defined in the dl module." 555); 556#endif 557 558#ifdef USE_MALLOPT 559/* Link with -lmalloc (or -lmpc) on an SGI */ 560#include <malloc.h> 561 562static PyObject * 563sys_mdebug(PyObject *self, PyObject *args) 564{ 565 int flag; 566 if (!PyArg_ParseTuple(args, "i:mdebug", &flag)) 567 return NULL; 568 mallopt(M_DEBUG, flag); 569 Py_INCREF(Py_None); 570 return Py_None; 571} 572#endif /* USE_MALLOPT */ 573 574static PyObject * 575sys_getrefcount(PyObject *self, PyObject *arg) 576{ 577 return PyLong_FromSsize_t(arg->ob_refcnt); 578} 579 580#ifdef Py_REF_DEBUG 581static PyObject * 582sys_gettotalrefcount(PyObject *self) 583{ 584 return PyLong_FromSsize_t(_Py_GetRefTotal()); 585} 586#endif /* Py_REF_DEBUG */ 587 588PyDoc_STRVAR(getrefcount_doc, 589"getrefcount(object) -> integer\n\ 590\n\ 591Return the reference count of object. The count returned is generally\n\ 592one higher than you might expect, because it includes the (temporary)\n\ 593reference as an argument to getrefcount()." 594); 595 596#ifdef COUNT_ALLOCS 597static PyObject * 598sys_getcounts(PyObject *self) 599{ 600 extern PyObject *get_counts(void); 601 602 return get_counts(); 603} 604#endif 605 606PyDoc_STRVAR(getframe_doc, 607"_getframe([depth]) -> frameobject\n\ 608\n\ 609Return a frame object from the call stack. If optional integer depth is\n\ 610given, return the frame object that many calls below the top of the stack.\n\ 611If that is deeper than the call stack, ValueError is raised. The default\n\ 612for depth is zero, returning the frame at the top of the call stack.\n\ 613\n\ 614This function should be used for internal and specialized\n\ 615purposes only." 616); 617 618static PyObject * 619sys_getframe(PyObject *self, PyObject *args) 620{ 621 PyFrameObject *f = PyThreadState_GET()->frame; 622 int depth = -1; 623 624 if (!PyArg_ParseTuple(args, "|i:_getframe", &depth)) 625 return NULL; 626 627 while (depth > 0 && f != NULL) { 628 f = f->f_back; 629 --depth; 630 } 631 if (f == NULL) { 632 PyErr_SetString(PyExc_ValueError, 633 "call stack is not deep enough"); 634 return NULL; 635 } 636 Py_INCREF(f); 637 return (PyObject*)f; 638} 639 640PyDoc_STRVAR(current_frames_doc, 641"_current_frames() -> dictionary\n\ 642\n\ 643Return a dictionary mapping each current thread T's thread id to T's\n\ 644current stack frame.\n\ 645\n\ 646This function should be used for specialized purposes only." 647); 648 649static PyObject * 650sys_current_frames(PyObject *self, PyObject *noargs) 651{ 652 return _PyThread_CurrentFrames(); 653} 654 655PyDoc_STRVAR(call_tracing_doc, 656"call_tracing(func, args) -> object\n\ 657\n\ 658Call func(*args), while tracing is enabled. The tracing state is\n\ 659saved, and restored afterwards. This is intended to be called from\n\ 660a debugger from a checkpoint, to recursively debug some other code." 661); 662 663static PyObject * 664sys_call_tracing(PyObject *self, PyObject *args) 665{ 666 PyObject *func, *funcargs; 667 if (!PyArg_UnpackTuple(args, "call_tracing", 2, 2, &func, &funcargs)) 668 return NULL; 669 return _PyEval_CallTracing(func, funcargs); 670} 671 672PyDoc_STRVAR(callstats_doc, 673"callstats() -> tuple of integers\n\ 674\n\ 675Return a tuple of function call statistics, if CALL_PROFILE was defined\n\ 676when Python was built. Otherwise, return None.\n\ 677\n\ 678When enabled, this function returns detailed, implementation-specific\n\ 679details about the number of function calls executed. The return value is\n\ 680a 11-tuple where the entries in the tuple are counts of:\n\ 6810. all function calls\n\ 6821. calls to PyFunction_Type objects\n\ 6832. PyFunction calls that do not create an argument tuple\n\ 6843. PyFunction calls that do not create an argument tuple\n\ 685 and bypass PyEval_EvalCodeEx()\n\ 6864. PyMethod calls\n\ 6875. PyMethod calls on bound methods\n\ 6886. PyType calls\n\ 6897. PyCFunction calls\n\ 6908. generator calls\n\ 6919. All other calls\n\ 69210. Number of stack pops performed by call_function()" 693); 694 695#ifdef __cplusplus 696extern "C" { 697#endif 698 699#ifdef Py_TRACE_REFS 700/* Defined in objects.c because it uses static globals if that file */ 701extern PyObject *_Py_GetObjects(PyObject *, PyObject *); 702#endif 703 704#ifdef DYNAMIC_EXECUTION_PROFILE 705/* Defined in ceval.c because it uses static globals if that file */ 706extern PyObject *_Py_GetDXProfile(PyObject *, PyObject *); 707#endif 708 709#ifdef __cplusplus 710} 711#endif 712 713static PyMethodDef sys_methods[] = { 714 /* Might as well keep this in alphabetic order */ 715 {"callstats", (PyCFunction)PyEval_GetCallStats, METH_NOARGS, 716 callstats_doc}, 717 {"_current_frames", sys_current_frames, METH_NOARGS, 718 current_frames_doc}, 719 {"displayhook", sys_displayhook, METH_O, displayhook_doc}, 720 {"exc_info", sys_exc_info, METH_NOARGS, exc_info_doc}, 721 {"excepthook", sys_excepthook, METH_VARARGS, excepthook_doc}, 722 {"exit", sys_exit, METH_VARARGS, exit_doc}, 723 {"getdefaultencoding", (PyCFunction)sys_getdefaultencoding, 724 METH_NOARGS, getdefaultencoding_doc}, 725#ifdef HAVE_DLOPEN 726 {"getdlopenflags", (PyCFunction)sys_getdlopenflags, METH_NOARGS, 727 getdlopenflags_doc}, 728#endif 729#ifdef COUNT_ALLOCS 730 {"getcounts", (PyCFunction)sys_getcounts, METH_NOARGS}, 731#endif 732#ifdef DYNAMIC_EXECUTION_PROFILE 733 {"getdxp", _Py_GetDXProfile, METH_VARARGS}, 734#endif 735 {"getfilesystemencoding", (PyCFunction)sys_getfilesystemencoding, 736 METH_NOARGS, getfilesystemencoding_doc}, 737#ifdef Py_TRACE_REFS 738 {"getobjects", _Py_GetObjects, METH_VARARGS}, 739#endif 740#ifdef Py_REF_DEBUG 741 {"gettotalrefcount", (PyCFunction)sys_gettotalrefcount, METH_NOARGS}, 742#endif 743 {"getrefcount", (PyCFunction)sys_getrefcount, METH_O, getrefcount_doc}, 744 {"getrecursionlimit", (PyCFunction)sys_getrecursionlimit, METH_NOARGS, 745 getrecursionlimit_doc}, 746 {"_getframe", sys_getframe, METH_VARARGS, getframe_doc}, 747#ifdef MS_WINDOWS 748 {"getwindowsversion", (PyCFunction)sys_getwindowsversion, METH_NOARGS, 749 getwindowsversion_doc}, 750#endif /* MS_WINDOWS */ 751 {"intern", sys_intern, METH_VARARGS, intern_doc}, 752#ifdef USE_MALLOPT 753 {"mdebug", sys_mdebug, METH_VARARGS}, 754#endif 755 {"setdefaultencoding", sys_setdefaultencoding, METH_VARARGS, 756 setdefaultencoding_doc}, 757 {"setcheckinterval", sys_setcheckinterval, METH_VARARGS, 758 setcheckinterval_doc}, 759 {"getcheckinterval", sys_getcheckinterval, METH_NOARGS, 760 getcheckinterval_doc}, 761#ifdef HAVE_DLOPEN 762 {"setdlopenflags", sys_setdlopenflags, METH_VARARGS, 763 setdlopenflags_doc}, 764#endif 765 {"setprofile", sys_setprofile, METH_O, setprofile_doc}, 766 {"setrecursionlimit", sys_setrecursionlimit, METH_VARARGS, 767 setrecursionlimit_doc}, 768#ifdef WITH_TSC 769 {"settscdump", sys_settscdump, METH_VARARGS, settscdump_doc}, 770#endif 771 {"settrace", sys_settrace, METH_O, settrace_doc}, 772 {"call_tracing", sys_call_tracing, METH_VARARGS, call_tracing_doc}, 773 {NULL, NULL} /* sentinel */ 774}; 775 776static PyObject * 777list_builtin_module_names(void) 778{ 779 PyObject *list = PyList_New(0); 780 int i; 781 if (list == NULL) 782 return NULL; 783 for (i = 0; PyImport_Inittab[i].name != NULL; i++) { 784 PyObject *name = PyUnicode_FromString( 785 PyImport_Inittab[i].name); 786 if (name == NULL) 787 break; 788 PyList_Append(list, name); 789 Py_DECREF(name); 790 } 791 if (PyList_Sort(list) != 0) { 792 Py_DECREF(list); 793 list = NULL; 794 } 795 if (list) { 796 PyObject *v = PyList_AsTuple(list); 797 Py_DECREF(list); 798 list = v; 799 } 800 return list; 801} 802 803static PyObject *warnoptions = NULL; 804 805void 806PySys_ResetWarnOptions(void) 807{ 808 if (warnoptions == NULL || !PyList_Check(warnoptions)) 809 return; 810 PyList_SetSlice(warnoptions, 0, PyList_GET_SIZE(warnoptions), NULL); 811} 812 813void 814PySys_AddWarnOption(const char *s) 815{ 816 PyObject *str; 817 818 if (warnoptions == NULL || !PyList_Check(warnoptions)) { 819 Py_XDECREF(warnoptions); 820 warnoptions = PyList_New(0); 821 if (warnoptions == NULL) 822 return; 823 } 824 str = PyUnicode_FromString(s); 825 if (str != NULL) { 826 PyList_Append(warnoptions, str); 827 Py_DECREF(str); 828 } 829} 830 831/* XXX This doc string is too long to be a single string literal in VC++ 5.0. 832 Two literals concatenated works just fine. If you have a K&R compiler 833 or other abomination that however *does* understand longer strings, 834 get rid of the !!! comment in the middle and the quotes that surround it. */ 835PyDoc_VAR(sys_doc) = 836PyDoc_STR( 837"This module provides access to some objects used or maintained by the\n\ 838interpreter and to functions that interact strongly with the interpreter.\n\ 839\n\ 840Dynamic objects:\n\ 841\n\ 842argv -- command line arguments; argv[0] is the script pathname if known\n\ 843path -- module search path; path[0] is the script directory, else ''\n\ 844modules -- dictionary of loaded modules\n\ 845\n\ 846displayhook -- called to show results in an interactive session\n\ 847excepthook -- called to handle any uncaught exception other than SystemExit\n\ 848 To customize printing in an interactive session or to install a custom\n\ 849 top-level exception handler, assign other functions to replace these.\n\ 850\n\ 851stdin -- standard input file object; used by raw_input() and input()\n\ 852stdout -- standard output file object; used by print()\n\ 853stderr -- standard error object; used for error messages\n\ 854 By assigning other file objects (or objects that behave like files)\n\ 855 to these, it is possible to redirect all of the interpreter's I/O.\n\ 856\n\ 857last_type -- type of last uncaught exception\n\ 858last_value -- value of last uncaught exception\n\ 859last_traceback -- traceback of last uncaught exception\n\ 860 These three are only available in an interactive session after a\n\ 861 traceback has been printed.\n\ 862" 863) 864/* concatenating string here */ 865PyDoc_STR( 866"\n\ 867Static objects:\n\ 868\n\ 869float_info -- a dict with information about the float implementation.\n\ 870maxsize -- the largest supported length of containers.\n\ 871maxunicode -- the largest supported character\n\ 872builtin_module_names -- tuple of module names built into this interpreter\n\ 873subversion -- subversion information of the build as tuple\n\ 874version -- the version of this interpreter as a string\n\ 875version_info -- version information as a tuple\n\ 876hexversion -- version information encoded as a single integer\n\ 877copyright -- copyright notice pertaining to this interpreter\n\ 878platform -- platform identifier\n\ 879executable -- pathname of this Python interpreter\n\ 880prefix -- prefix used to find the Python library\n\ 881exec_prefix -- prefix used to find the machine-specific Python library\n\ 882" 883) 884#ifdef MS_WINDOWS 885/* concatenating string here */ 886PyDoc_STR( 887"dllhandle -- [Windows only] integer handle of the Python DLL\n\ 888winver -- [Windows only] version number of the Python DLL\n\ 889" 890) 891#endif /* MS_WINDOWS */ 892PyDoc_STR( 893"__stdin__ -- the original stdin; don't touch!\n\ 894__stdout__ -- the original stdout; don't touch!\n\ 895__stderr__ -- the original stderr; don't touch!\n\ 896__displayhook__ -- the original displayhook; don't touch!\n\ 897__excepthook__ -- the original excepthook; don't touch!\n\ 898\n\ 899Functions:\n\ 900\n\ 901displayhook() -- print an object to the screen, and save it in builtins._\n\ 902excepthook() -- print an exception and its traceback to sys.stderr\n\ 903exc_info() -- return thread-safe information about the current exception\n\ 904exit() -- exit the interpreter by raising SystemExit\n\ 905getdlopenflags() -- returns flags to be used for dlopen() calls\n\ 906getrefcount() -- return the reference count for an object (plus one :-)\n\ 907getrecursionlimit() -- return the max recursion depth for the interpreter\n\ 908setcheckinterval() -- control how often the interpreter checks for events\n\ 909setdlopenflags() -- set the flags to be used for dlopen() calls\n\ 910setprofile() -- set the global profiling function\n\ 911setrecursionlimit() -- set the max recursion depth for the interpreter\n\ 912settrace() -- set the global debug tracing function\n\ 913" 914) 915/* end of sys_doc */ ; 916 917/* Subversion branch and revision management */ 918static const char _patchlevel_revision[] = PY_PATCHLEVEL_REVISION; 919static const char headurl[] = "$HeadURL$"; 920static int svn_initialized; 921static char patchlevel_revision[50]; /* Just the number */ 922static char branch[50]; 923static char shortbranch[50]; 924static const char *svn_revision; 925 926static void 927svnversion_init(void) 928{ 929 const char *python, *br_start, *br_end, *br_end2, *svnversion; 930 Py_ssize_t len; 931 int istag = 0; 932 933 if (svn_initialized) 934 return; 935 936 python = strstr(headurl, "/python/"); 937 if (!python) { 938 strcpy(branch, "unknown branch"); 939 strcpy(shortbranch, "unknown"); 940 } 941 else { 942 br_start = python + 8; 943 br_end = strchr(br_start, '/'); 944 assert(br_end); 945 946 /* Works even for trunk, 947 as we are in trunk/Python/sysmodule.c */ 948 br_end2 = strchr(br_end+1, '/'); 949 950 istag = strncmp(br_start, "tags", 4) == 0; 951 if (strncmp(br_start, "trunk", 5) == 0) { 952 strcpy(branch, "trunk"); 953 strcpy(shortbranch, "trunk"); 954 } 955 else if (istag || strncmp(br_start, "branches", 8) == 0) { 956 len = br_end2 - br_start; 957 strncpy(branch, br_start, len); 958 branch[len] = '\0'; 959 960 len = br_end2 - (br_end + 1); 961 strncpy(shortbranch, br_end + 1, len); 962 shortbranch[len] = '\0'; 963 } 964 else { 965 Py_FatalError("bad HeadURL"); 966 return; 967 } 968 } 969 970 971 svnversion = _Py_svnversion(); 972 if (strcmp(svnversion, "exported") != 0) 973 svn_revision = svnversion; 974 else if (istag) { 975 len = strlen(_patchlevel_revision); 976 assert(len >= 13); 977 assert(len < (sizeof(patchlevel_revision) + 13)); 978 strncpy(patchlevel_revision, _patchlevel_revision + 11, 979 len - 13); 980 patchlevel_revision[len - 13] = '\0'; 981 svn_revision = patchlevel_revision; 982 } 983 else 984 svn_revision = ""; 985 986 svn_initialized = 1; 987} 988 989/* Return svnversion output if available. 990 Else return Revision of patchlevel.h if on branch. 991 Else return empty string */ 992const char* 993Py_SubversionRevision() 994{ 995 svnversion_init(); 996 return svn_revision; 997} 998 999const char* 1000Py_SubversionShortBranch() 1001{ 1002 svnversion_init(); 1003 return shortbranch; 1004} 1005 1006 1007PyDoc_STRVAR(flags__doc__, 1008"sys.flags\n\ 1009\n\ 1010Flags provided through command line arguments or environment vars."); 1011 1012static PyTypeObject FlagsType; 1013 1014static PyStructSequence_Field flags_fields[] = { 1015 {"debug", "-d"}, 1016 {"division_warning", "-Q"}, 1017 {"inspect", "-i"}, 1018 {"interactive", "-i"}, 1019 {"optimize", "-O or -OO"}, 1020 {"dont_write_bytecode", "-B"}, 1021 /* {"no_user_site", "-s"}, */ 1022 {"no_site", "-S"}, 1023 {"ingnore_environment", "-E"}, 1024 {"tabcheck", "-t or -tt"}, 1025 {"verbose", "-v"}, 1026#ifdef RISCOS 1027 {"ricos_wimp", "???"}, 1028#endif 1029 /* {"unbuffered", "-u"}, */ 1030 /* {"skip_first", "-x"}, */ 1031 {0} 1032}; 1033 1034static PyStructSequence_Desc flags_desc = { 1035 "sys.flags", /* name */ 1036 flags__doc__, /* doc */ 1037 flags_fields, /* fields */ 1038#ifdef RISCOS 1039 11 1040#else 1041 10 1042#endif 1043}; 1044 1045static PyObject* 1046make_flags(void) 1047{ 1048 int pos = 0; 1049 PyObject *seq; 1050 1051 seq = PyStructSequence_New(&FlagsType); 1052 if (seq == NULL) 1053 return NULL; 1054 1055#define SetFlag(flag) \ 1056 PyStructSequence_SET_ITEM(seq, pos++, PyLong_FromLong(flag)) 1057 1058 SetFlag(Py_DebugFlag); 1059 SetFlag(Py_DivisionWarningFlag); 1060 SetFlag(Py_InspectFlag); 1061 SetFlag(Py_InteractiveFlag); 1062 SetFlag(Py_OptimizeFlag); 1063 SetFlag(Py_DontWriteBytecodeFlag); 1064 /* SetFlag(Py_NoUserSiteDirectory); */ 1065 SetFlag(Py_NoSiteFlag); 1066 SetFlag(Py_IgnoreEnvironmentFlag); 1067 SetFlag(Py_TabcheckFlag); 1068 SetFlag(Py_VerboseFlag); 1069#ifdef RISCOS 1070 SetFlag(Py_RISCOSWimpFlag); 1071#endif 1072 /* SetFlag(saw_unbuffered_flag); */ 1073 /* SetFlag(skipfirstline); */ 1074#undef SetFlag 1075 1076 if (PyErr_Occurred()) { 1077 return NULL; 1078 } 1079 1080 Py_INCREF(seq); 1081 return seq; 1082} 1083 1084PyObject * 1085_PySys_Init(void) 1086{ 1087 PyObject *m, *v, *sysdict; 1088 char *s; 1089 1090 m = Py_InitModule3("sys", sys_methods, sys_doc); 1091 if (m == NULL) 1092 return NULL; 1093 sysdict = PyModule_GetDict(m); 1094 1095 { 1096 /* XXX: does this work on Win/Win64? (see posix_fstat) */ 1097 struct stat sb; 1098 if (fstat(fileno(stdin), &sb) == 0 && 1099 S_ISDIR(sb.st_mode)) { 1100 /* There's nothing more we can do. */ 1101 /* Py_FatalError() will core dump, so just exit. */ 1102 PySys_WriteStderr("Python error: <stdin> is a directory, cannot continue\n"); 1103 exit(EXIT_FAILURE); 1104 } 1105 } 1106 1107 /* stdin/stdout/stderr are now set by pythonrun.c */ 1108 1109 PyDict_SetItemString(sysdict, "__displayhook__", 1110 PyDict_GetItemString(sysdict, "displayhook")); 1111 PyDict_SetItemString(sysdict, "__excepthook__", 1112 PyDict_GetItemString(sysdict, "excepthook")); 1113 PyDict_SetItemString(sysdict, "version", 1114 v = PyUnicode_FromString(Py_GetVersion())); 1115 Py_XDECREF(v); 1116 PyDict_SetItemString(sysdict, "hexversion", 1117 v = PyLong_FromLong(PY_VERSION_HEX)); 1118 Py_XDECREF(v); 1119 svnversion_init(); 1120 v = Py_BuildValue("(UUU)", "CPython", branch, svn_revision); 1121 PyDict_SetItemString(sysdict, "subversion", v); 1122 Py_XDECREF(v); 1123 PyDict_SetItemString(sysdict, "dont_write_bytecode", 1124 v = PyBool_FromLong(Py_DontWriteBytecodeFlag)); 1125 Py_XDECREF(v); 1126 /* 1127 * These release level checks are mutually exclusive and cover 1128 * the field, so don't get too fancy with the pre-processor! 1129 */ 1130#if PY_RELEASE_LEVEL == PY_RELEASE_LEVEL_ALPHA 1131 s = "alpha"; 1132#elif PY_RELEASE_LEVEL == PY_RELEASE_LEVEL_BETA 1133 s = "beta"; 1134#elif PY_RELEASE_LEVEL == PY_RELEASE_LEVEL_GAMMA 1135 s = "candidate"; 1136#elif PY_RELEASE_LEVEL == PY_RELEASE_LEVEL_FINAL 1137 s = "final"; 1138#endif 1139 1140#define SET_SYS_FROM_STRING(key, value) \ 1141 v = value; \ 1142 if (v != NULL) \ 1143 PyDict_SetItemString(sysdict, key, v); \ 1144 Py_XDECREF(v) 1145 1146 SET_SYS_FROM_STRING("version_info", 1147 Py_BuildValue("iiiUi", PY_MAJOR_VERSION, 1148 PY_MINOR_VERSION, 1149 PY_MICRO_VERSION, s, 1150 PY_RELEASE_SERIAL)); 1151 SET_SYS_FROM_STRING("api_version", 1152 PyLong_FromLong(PYTHON_API_VERSION)); 1153 SET_SYS_FROM_STRING("copyright", 1154 PyUnicode_FromString(Py_GetCopyright())); 1155 SET_SYS_FROM_STRING("platform", 1156 PyUnicode_FromString(Py_GetPlatform())); 1157 SET_SYS_FROM_STRING("executable", 1158 PyUnicode_DecodeFSDefault( 1159 Py_GetProgramFullPath())); 1160 SET_SYS_FROM_STRING("prefix", 1161 PyUnicode_DecodeFSDefault(Py_GetPrefix())); 1162 SET_SYS_FROM_STRING("exec_prefix", 1163 PyUnicode_DecodeFSDefault(Py_GetExecPrefix())); 1164 SET_SYS_FROM_STRING("maxsize", 1165 PyLong_FromSsize_t(PY_SSIZE_T_MAX)); 1166 SET_SYS_FROM_STRING("float_info", 1167 PyFloat_GetInfo()); 1168 SET_SYS_FROM_STRING("maxunicode", 1169 PyLong_FromLong(PyUnicode_GetMax())); 1170 SET_SYS_FROM_STRING("builtin_module_names", 1171 list_builtin_module_names()); 1172 { 1173 /* Assumes that longs are at least 2 bytes long. 1174 Should be safe! */ 1175 unsigned long number = 1; 1176 char *value; 1177 1178 s = (char *) &number; 1179 if (s[0] == 0) 1180 value = "big"; 1181 else 1182 value = "little"; 1183 SET_SYS_FROM_STRING("byteorder", 1184 PyUnicode_FromString(value)); 1185 } 1186#ifdef MS_COREDLL 1187 SET_SYS_FROM_STRING("dllhandle", 1188 PyLong_FromVoidPtr(PyWin_DLLhModule)); 1189 SET_SYS_FROM_STRING("winver", 1190 PyUnicode_FromString(PyWin_DLLVersionString)); 1191#endif 1192#undef SET_SYS_FROM_STRING 1193 if (warnoptions == NULL) { 1194 warnoptions = PyList_New(0); 1195 } 1196 else { 1197 Py_INCREF(warnoptions); 1198 } 1199 if (warnoptions != NULL) { 1200 PyDict_SetItemString(sysdict, "warnoptions", warnoptions); 1201 } 1202 1203 PyStructSequence_InitType(&FlagsType, &flags_desc); 1204 PyDict_SetItemString(sysdict, "flags", make_flags()); 1205 /* prevent user from creating new instances */ 1206 FlagsType.tp_init = NULL; 1207 FlagsType.tp_new = NULL; 1208 1209 if (PyErr_Occurred()) 1210 return NULL; 1211 return m; 1212} 1213 1214static PyObject * 1215makepathobject(const char *path, int delim) 1216{ 1217 int i, n; 1218 const char *p; 1219 PyObject *v, *w; 1220 1221 n = 1; 1222 p = path; 1223 while ((p = strchr(p, delim)) != NULL) { 1224 n++; 1225 p++; 1226 } 1227 v = PyList_New(n); 1228 if (v == NULL) 1229 return NULL; 1230 for (i = 0; ; i++) { 1231 p = strchr(path, delim); 1232 if (p == NULL) 1233 p = strchr(path, '\0'); /* End of string */ 1234 w = PyUnicode_DecodeFSDefaultAndSize(path, (Py_ssize_t) (p - path)); 1235 if (w == NULL) { 1236 Py_DECREF(v); 1237 return NULL; 1238 } 1239 PyList_SetItem(v, i, w); 1240 if (*p == '\0') 1241 break; 1242 path = p+1; 1243 } 1244 return v; 1245} 1246 1247void 1248PySys_SetPath(const char *path) 1249{ 1250 PyObject *v; 1251 if ((v = makepathobject(path, DELIM)) == NULL) 1252 Py_FatalError("can't create sys.path"); 1253 if (PySys_SetObject("path", v) != 0) 1254 Py_FatalError("can't assign sys.path"); 1255 Py_DECREF(v); 1256} 1257 1258static PyObject * 1259makeargvobject(int argc, char **argv) 1260{ 1261 PyObject *av; 1262 if (argc <= 0 || argv == NULL) { 1263 /* Ensure at least one (empty) argument is seen */ 1264 static char *empty_argv[1] = {""}; 1265 argv = empty_argv; 1266 argc = 1; 1267 } 1268 av = PyList_New(argc); 1269 if (av != NULL) { 1270 int i; 1271 for (i = 0; i < argc; i++) { 1272#ifdef __VMS 1273 PyObject *v; 1274 1275 /* argv[0] is the script pathname if known */ 1276 if (i == 0) { 1277 char* fn = decc$translate_vms(argv[0]); 1278 if ((fn == (char *)0) || fn == (char *)-1) 1279 v = PyUnicode_FromString(argv[0]); 1280 else 1281 v = PyUnicode_FromString( 1282 decc$translate_vms(argv[0])); 1283 } else 1284 v = PyUnicode_FromString(argv[i]); 1285#else 1286 PyObject *v = PyUnicode_FromString(argv[i]); 1287#endif 1288 if (v == NULL) { 1289 Py_DECREF(av); 1290 av = NULL; 1291 break; 1292 } 1293 PyList_SetItem(av, i, v); 1294 } 1295 } 1296 return av; 1297} 1298 1299void 1300PySys_SetArgv(int argc, char **argv) 1301{ 1302#if defined(HAVE_REALPATH) 1303 char fullpath[MAXPATHLEN]; 1304#elif defined(MS_WINDOWS) 1305 char fullpath[MAX_PATH]; 1306#endif 1307 PyObject *av = makeargvobject(argc, argv); 1308 PyObject *path = PySys_GetObject("path"); 1309 if (av == NULL) 1310 Py_FatalError("no mem for sys.argv"); 1311 if (PySys_SetObject("argv", av) != 0) 1312 Py_FatalError("can't assign sys.argv"); 1313 if (path != NULL) { 1314 char *argv0 = argv[0]; 1315 char *p = NULL; 1316 Py_ssize_t n = 0; 1317 PyObject *a; 1318#ifdef HAVE_READLINK 1319 char link[MAXPATHLEN+1]; 1320 char argv0copy[2*MAXPATHLEN+1]; 1321 int nr = 0; 1322 if (argc > 0 && argv0 != NULL && strcmp(argv0, "-c") != 0) 1323 nr = readlink(argv0, link, MAXPATHLEN); 1324 if (nr > 0) { 1325 /* It's a symlink */ 1326 link[nr] = '\0'; 1327 if (link[0] == SEP) 1328 argv0 = link; /* Link to absolute path */ 1329 else if (strchr(link, SEP) == NULL) 1330 ; /* Link without path */ 1331 else { 1332 /* Must join(dirname(argv0), link) */ 1333 char *q = strrchr(argv0, SEP); 1334 if (q == NULL) 1335 argv0 = link; /* argv0 without path */ 1336 else { 1337 /* Must make a copy */ 1338 strcpy(argv0copy, argv0); 1339 q = strrchr(argv0copy, SEP); 1340 strcpy(q+1, link); 1341 argv0 = argv0copy; 1342 } 1343 } 1344 } 1345#endif /* HAVE_READLINK */ 1346#if SEP == '\\' /* Special case for MS filename syntax */ 1347 if (argc > 0 && argv0 != NULL && strcmp(argv0, "-c") != 0) { 1348 char *q; 1349#ifdef MS_WINDOWS 1350 char *ptemp; 1351 if (GetFullPathName(argv0, 1352 sizeof(fullpath), 1353 fullpath, 1354 &ptemp)) { 1355 argv0 = fullpath; 1356 } 1357#endif 1358 p = strrchr(argv0, SEP); 1359 /* Test for alternate separator */ 1360 q = strrchr(p ? p : argv0, '/'); 1361 if (q != NULL) 1362 p = q; 1363 if (p != NULL) { 1364 n = p + 1 - argv0; 1365 if (n > 1 && p[-1] != ':') 1366 n--; /* Drop trailing separator */ 1367 } 1368 } 1369#else /* All other filename syntaxes */ 1370 if (argc > 0 && argv0 != NULL && strcmp(argv0, "-c") != 0) { 1371#if defined(HAVE_REALPATH) 1372 if (realpath(argv0, fullpath)) { 1373 argv0 = fullpath; 1374 } 1375#endif 1376 p = strrchr(argv0, SEP); 1377 } 1378 if (p != NULL) { 1379 n = p + 1 - argv0; 1380#if SEP == '/' /* Special case for Unix filename syntax */ 1381 if (n > 1) 1382 n--; /* Drop trailing separator */ 1383#endif /* Unix */ 1384 } 1385#endif /* All others */ 1386 a = PyUnicode_FromStringAndSize(argv0, n); 1387 if (a == NULL) 1388 Py_FatalError("no mem for sys.path insertion"); 1389 if (PyList_Insert(path, 0, a) < 0) 1390 Py_FatalError("sys.path.insert(0) failed"); 1391 Py_DECREF(a); 1392 } 1393 Py_DECREF(av); 1394} 1395 1396 1397/* APIs to write to sys.stdout or sys.stderr using a printf-like interface. 1398 Adapted from code submitted by Just van Rossum. 1399 1400 PySys_WriteStdout(format, ...) 1401 PySys_WriteStderr(format, ...) 1402 1403 The first function writes to sys.stdout; the second to sys.stderr. When 1404 there is a problem, they write to the real (C level) stdout or stderr; 1405 no exceptions are raised. 1406 1407 Both take a printf-style format string as their first argument followed 1408 by a variable length argument list determined by the format string. 1409 1410 *** WARNING *** 1411 1412 The format should limit the total size of the formatted output string to 1413 1000 bytes. In particular, this means that no unrestricted "%s" formats 1414 should occur; these should be limited using "%.<N>s where <N> is a 1415 decimal number calculated so that <N> plus the maximum size of other 1416 formatted text does not exceed 1000 bytes. Also watch out for "%f", 1417 which can print hundreds of digits for very large numbers. 1418 1419 */ 1420 1421static void 1422mywrite(char *name, FILE *fp, const char *format, va_list va) 1423{ 1424 PyObject *file; 1425 PyObject *error_type, *error_value, *error_traceback; 1426 char buffer[1001]; 1427 int written; 1428 1429 PyErr_Fetch(&error_type, &error_value, &error_traceback); 1430 file = PySys_GetObject(name); 1431 written = PyOS_vsnprintf(buffer, sizeof(buffer), format, va); 1432 if (PyFile_WriteString(buffer, file) != 0) { 1433 PyErr_Clear(); 1434 fputs(buffer, fp); 1435 } 1436 if (written < 0 || (size_t)written >= sizeof(buffer)) { 1437 const char *truncated = "... truncated"; 1438 if (PyFile_WriteString(truncated, file) != 0) { 1439 PyErr_Clear(); 1440 fputs(truncated, fp); 1441 } 1442 } 1443 PyErr_Restore(error_type, error_value, error_traceback); 1444} 1445 1446void 1447PySys_WriteStdout(const char *format, ...) 1448{ 1449 va_list va; 1450 1451 va_start(va, format); 1452 mywrite("stdout", stdout, format, va); 1453 va_end(va); 1454} 1455 1456void 1457PySys_WriteStderr(const char *format, ...) 1458{ 1459 va_list va; 1460 1461 va_start(va, format); 1462 mywrite("stderr", stderr, format, va); 1463 va_end(va); 1464} 1465