summaryrefslogtreecommitdiffstats
path: root/Python/sysmodule.c
blob: fe880d5443ca4b04dc9d83252f7a20d6f4894039 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907

/* System module */

/*
Various bits of information used by the interpreter are collected in
module 'sys'.
Function member:
- exit(sts): raise SystemExit
Data members:
- stdin, stdout, stderr: standard file objects
- modules: the table of modules (dictionary)
- path: module search path (list of strings)
- argv: script arguments (list of strings)
- ps1, ps2: optional primary and secondary prompts (strings)
*/

#include "Python.h"
#include "compile.h"
#include "frameobject.h"

#include "osdefs.h"

#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif

#ifdef MS_COREDLL
extern void *PyWin_DLLhModule;
/* A string loaded from the DLL at startup: */
extern const char *PyWin_DLLVersionString;
#endif

PyObject *
PySys_GetObject(char *name)
{
	PyThreadState *tstate = PyThreadState_Get();
	PyObject *sd = tstate->interp->sysdict;
	if (sd == NULL)
		return NULL;
	return PyDict_GetItemString(sd, name);
}

FILE *
PySys_GetFile(char *name, FILE *def)
{
	FILE *fp = NULL;
	PyObject *v = PySys_GetObject(name);
	if (v != NULL && PyFile_Check(v))
		fp = PyFile_AsFile(v);
	if (fp == NULL)
		fp = def;
	return fp;
}

int
PySys_SetObject(char *name, PyObject *v)
{
	PyThreadState *tstate = PyThreadState_Get();
	PyObject *sd = tstate->interp->sysdict;
	if (v == NULL) {
		if (PyDict_GetItemString(sd, name) == NULL)
			return 0;
		else
			return PyDict_DelItemString(sd, name);
	}
	else
		return PyDict_SetItemString(sd, name, v);
}

static PyObject *
sys_displayhook(PyObject *self, PyObject *args)
{
	PyObject *o, *outf;
	PyInterpreterState *interp = PyThreadState_Get()->interp;
	PyObject *modules = interp->modules;
	PyObject *builtins = PyDict_GetItemString(modules, "__builtin__");

	/* parse arguments */
	if (!PyArg_ParseTuple(args, "O:displayhook", &o))
		return NULL;

	/* Print value except if None */
	/* After printing, also assign to '_' */
	/* Before, set '_' to None to avoid recursion */
	if (o == Py_None) {
		Py_INCREF(Py_None);
		return Py_None;
	}
	if (PyObject_SetAttrString(builtins, "_", Py_None) != 0)
		return NULL;
	if (Py_FlushLine() != 0)
		return NULL;
	outf = PySys_GetObject("stdout");
	if (outf == NULL) {
		PyErr_SetString(PyExc_RuntimeError, "lost sys.stdout");
		return NULL;
	}
	if (PyFile_WriteObject(o, outf, 0) != 0)
		return NULL;
	PyFile_SoftSpace(outf, 1);
	if (Py_FlushLine() != 0)
		return NULL;
	if (PyObject_SetAttrString(builtins, "_", o) != 0)
		return NULL;
	Py_INCREF(Py_None);
	return Py_None;
}

static char displayhook_doc[] =
"displayhook(object) -> None\n"
"\n"
"Print an object to sys.stdout and also save it in __builtin__._\n";

static PyObject *
sys_excepthook(PyObject* self, PyObject* args)
{
	PyObject *exc, *value, *tb;
	if (!PyArg_ParseTuple(args, "OOO:excepthook", &exc, &value, &tb))
		return NULL;
	PyErr_Display(exc, value, tb);
	Py_INCREF(Py_None);
	return Py_None;
}

static char excepthook_doc[] =
"excepthook(exctype, value, traceback) -> None\n"
"\n"
"Handle an exception by displaying it with a traceback on sys.stderr.\n";

static PyObject *
sys_exc_info(PyObject *self, PyObject *args)
{
	PyThreadState *tstate;
	if (!PyArg_ParseTuple(args, ":exc_info"))
		return NULL;
	tstate = PyThreadState_Get();
	return Py_BuildValue(
		"(OOO)",
		tstate->exc_type != NULL ? tstate->exc_type : Py_None,
		tstate->exc_value != NULL ? tstate->exc_value : Py_None,
		tstate->exc_traceback != NULL ?
			tstate->exc_traceback : Py_None);
}

static char exc_info_doc[] =
"exc_info() -> (type, value, traceback)\n\
\n\
Return information about the exception that is currently being handled.\n\
This should be called from inside an except clause only.";

static PyObject *
sys_exit(PyObject *self, PyObject *args)
{
	/* Raise SystemExit so callers may catch it or clean up. */
	PyErr_SetObject(PyExc_SystemExit, args);
	return NULL;
}

static char exit_doc[] =
"exit([status])\n\
\n\
Exit the interpreter by raising SystemExit(status).\n\
If the status is omitted or None, it defaults to zero (i.e., success).\n\
If the status numeric, it will be used as the system exit status.\n\
If it is another kind of object, it will be printed and the system\n\
exit status will be one (i.e., failure).";

static PyObject *
sys_getdefaultencoding(PyObject *self, PyObject *args)
{
	if (!PyArg_ParseTuple(args, ":getdefaultencoding"))
		return NULL;
	return PyString_FromString(PyUnicode_GetDefaultEncoding());
}

static char getdefaultencoding_doc[] =
"getdefaultencoding() -> string\n\
\n\
Return the current default string encoding used by the Unicode \n\
implementation.";

static PyObject *
sys_setdefaultencoding(PyObject *self, PyObject *args)
{
	char *encoding;
	if (!PyArg_ParseTuple(args, "s:setdefaultencoding", &encoding))
		return NULL;
	if (PyUnicode_SetDefaultEncoding(encoding))
	    	return NULL;
	Py_INCREF(Py_None);
	return Py_None;
}

static char setdefaultencoding_doc[] =
"setdefaultencoding(encoding)\n\
\n\
Set the current default string encoding used by the Unicode implementation.";

extern int _PyTrace_Init(void);

static PyObject *
sys_settrace(PyObject *self, PyObject *args)
{
	PyThreadState *tstate = PyThreadState_Get();
	if (_PyTrace_Init() == -1)
		return NULL;
	if (args == Py_None)
		args = NULL;
	else
		Py_XINCREF(args);
	Py_XDECREF(tstate->sys_tracefunc);
	tstate->sys_tracefunc = args;
	Py_INCREF(Py_None);
	return Py_None;
}

static char settrace_doc[] =
"settrace(function)\n\
\n\
Set the global debug tracing function.  It will be called on each\n\
function call.  See the debugger chapter in the library manual.";

static PyObject *
sys_setprofile(PyObject *self, PyObject *args)
{
	PyThreadState *tstate = PyThreadState_Get();
	if (_PyTrace_Init() == -1)
		return NULL;
	if (args == Py_None)
		args = NULL;
	else
		Py_XINCREF(args);
	Py_XDECREF(tstate->sys_profilefunc);
	tstate->sys_profilefunc = args;
	Py_INCREF(Py_None);
	return Py_None;
}

static char setprofile_doc[] =
"setprofile(function)\n\
\n\
Set the profiling function.  It will be called on each function call\n\
and return.  See the profiler chapter in the library manual.";

static PyObject *
sys_setcheckinterval(PyObject *self, PyObject *args)
{
	PyThreadState *tstate = PyThreadState_Get();
	if (!PyArg_ParseTuple(args, "i:setcheckinterval", &tstate->interp->checkinterval))
		return NULL;
	Py_INCREF(Py_None);
	return Py_None;
}

static char setcheckinterval_doc[] =
"setcheckinterval(n)\n\
\n\
Tell the Python interpreter to check for asynchronous events every\n\
n instructions.  This also affects how often thread switches occur.";

static PyObject *
sys_setrecursionlimit(PyObject *self, PyObject *args)
{
	int new_limit;
	if (!PyArg_ParseTuple(args, "i:setrecursionlimit", &new_limit))
		return NULL;
	if (new_limit <= 0) {
		PyErr_SetString(PyExc_ValueError, 
				"recursion limit must be positive");  
		return NULL;
	}
	Py_SetRecursionLimit(new_limit);
	Py_INCREF(Py_None);
	return Py_None;
}

static char setrecursionlimit_doc[] =
"setrecursionlimit(n)\n\
\n\
Set the maximum depth of the Python interpreter stack to n.  This\n\
limit prevents infinite recursion from causing an overflow of the C\n\
stack and crashing Python.  The highest possible limit is platform-\n\
dependent.";

static PyObject *
sys_getrecursionlimit(PyObject *self, PyObject *args)
{
	if (!PyArg_ParseTuple(args, ":getrecursionlimit"))
		return NULL;
	return PyInt_FromLong(Py_GetRecursionLimit());
}

static char getrecursionlimit_doc[] =
"getrecursionlimit()\n\
\n\
Return the current value of the recursion limit, the maximum depth\n\
of the Python interpreter stack.  This limit prevents infinite\n\
recursion from causing an overflow of the C stack and crashing Python.";

#ifdef USE_MALLOPT
/* Link with -lmalloc (or -lmpc) on an SGI */
#include <malloc.h>

static PyObject *
sys_mdebug(PyObject *self, PyObject *args)
{
	int flag;
	if (!PyArg_ParseTuple(args, "i:mdebug", &flag))
		return NULL;
	mallopt(M_DEBUG, flag);
	Py_INCREF(Py_None);
	return Py_None;
}
#endif /* USE_MALLOPT */

static PyObject *
sys_getrefcount(PyObject *self, PyObject *args)
{
	PyObject *arg;
	if (!PyArg_ParseTuple(args, "O:getrefcount", &arg))
		return NULL;
	return PyInt_FromLong(arg->ob_refcnt);
}

#ifdef Py_TRACE_REFS
static PyObject *
sys_gettotalrefcount(PyObject *self, PyObject *args)
{
	extern long _Py_RefTotal;
	if (!PyArg_ParseTuple(args, ":gettotalrefcount"))
		return NULL;
	return PyInt_FromLong(_Py_RefTotal);
}

#endif /* Py_TRACE_REFS */

static char getrefcount_doc[] =
"getrefcount(object) -> integer\n\
\n\
Return the current reference count for the object.  This includes the\n\
temporary reference in the argument list, so it is at least 2.";

#ifdef COUNT_ALLOCS
static PyObject *
sys_getcounts(PyObject *self, PyObject *args)
{
	extern PyObject *get_counts(void);

	if (!PyArg_ParseTuple(args, ":getcounts"))
		return NULL;
	return get_counts();
}
#endif

static char getframe_doc[] =
"_getframe([depth]) -> frameobject\n\
\n\
Return a frame object from the call stack.  If optional integer depth is\n\
given, return the frame object that many calls below the top of the stack.\n\
If that is deeper than the call stack, ValueError is raised.  The default\n\
for depth is zero, returning the frame at the top of the call stack.\n\
\n\
This function should be used for internal and specialized\n\
purposes only.";

static PyObject *
sys_getframe(PyObject *self, PyObject *args)
{
	PyFrameObject *f = PyThreadState_Get()->frame;
	int depth = -1;

	if (!PyArg_ParseTuple(args, "|i:_getframe", &depth))
		return NULL;

	while (depth > 0 && f != NULL) {
		f = f->f_back;
		--depth;
	}
	if (f == NULL) {
		PyErr_SetString(PyExc_ValueError,
				"call stack is not deep enough");
		return NULL;
	}
	Py_INCREF(f);
	return (PyObject*)f;
}


#ifdef Py_TRACE_REFS
/* Defined in objects.c because it uses static globals if that file */
extern PyObject *_Py_GetObjects(PyObject *, PyObject *);
#endif

#ifdef DYNAMIC_EXECUTION_PROFILE
/* Defined in ceval.c because it uses static globals if that file */
extern PyObject *_Py_GetDXProfile(PyObject *,  PyObject *);
#endif

static PyMethodDef sys_methods[] = {
	/* Might as well keep this in alphabetic order */
	{"displayhook",	sys_displayhook, 1, displayhook_doc},
	{"exc_info",	sys_exc_info, 1, exc_info_doc},
	{"excepthook",	sys_excepthook, 1, excepthook_doc},
	{"exit",	sys_exit, 0, exit_doc},
	{"getdefaultencoding", sys_getdefaultencoding, 1,
	 getdefaultencoding_doc}, 
#ifdef COUNT_ALLOCS
	{"getcounts",	sys_getcounts, 1},
#endif
#ifdef DYNAMIC_EXECUTION_PROFILE
	{"getdxp",	_Py_GetDXProfile, 1},
#endif
#ifdef Py_TRACE_REFS
	{"getobjects",	_Py_GetObjects, 1},
	{"gettotalrefcount", sys_gettotalrefcount, 1},
#endif
	{"getrefcount",	sys_getrefcount, 1, getrefcount_doc},
	{"getrecursionlimit", sys_getrecursionlimit, 1,
	 getrecursionlimit_doc},
	{"_getframe", sys_getframe, 1, getframe_doc},
#ifdef USE_MALLOPT
	{"mdebug",	sys_mdebug, 1},
#endif
	{"setdefaultencoding", sys_setdefaultencoding, 1,
	 setdefaultencoding_doc}, 
	{"setcheckinterval",	sys_setcheckinterval, 1,
	 setcheckinterval_doc}, 
	{"setprofile",	sys_setprofile, 0, setprofile_doc},
	{"setrecursionlimit", sys_setrecursionlimit, 1,
	 setrecursionlimit_doc},
	{"settrace",	sys_settrace, 0, settrace_doc},
	{NULL,		NULL}		/* sentinel */
};

static PyObject *
list_builtin_module_names(void)
{
	PyObject *list = PyList_New(0);
	int i;
	if (list == NULL)
		return NULL;
	for (i = 0; PyImport_Inittab[i].name != NULL; i++) {
		PyObject *name = PyString_FromString(
			PyImport_Inittab[i].name);
		if (name == NULL)
			break;
		PyList_Append(list, name);
		Py_DECREF(name);
	}
	if (PyList_Sort(list) != 0) {
		Py_DECREF(list);
		list = NULL;
	}
	if (list) {
		PyObject *v = PyList_AsTuple(list);
		Py_DECREF(list);
		list = v;
	}
	return list;
}

static PyObject *warnoptions = NULL;

void
PySys_ResetWarnOptions(void)
{
	if (warnoptions == NULL || !PyList_Check(warnoptions))
		return;
	PyList_SetSlice(warnoptions, 0, PyList_GET_SIZE(warnoptions), NULL);
}

void
PySys_AddWarnOption(char *s)
{
	PyObject *str;

	if (warnoptions == NULL || !PyList_Check(warnoptions)) {
		Py_XDECREF(warnoptions);
		warnoptions = PyList_New(0);
		if (warnoptions == NULL)
			return;
	}
	str = PyString_FromString(s);
	if (str != NULL) {
		PyList_Append(warnoptions, str);
		Py_DECREF(str);
	}
}

/* XXX This doc string is too long to be a single string literal in VC++ 5.0.
   Two literals concatenated works just fine.  If you have a K&R compiler
   or other abomination that however *does* understand longer strings,
   get rid of the !!! comment in the middle and the quotes that surround it. */
static char sys_doc[] =
"This module provides access to some objects used or maintained by the\n\
interpreter and to functions that interact strongly with the interpreter.\n\
\n\
Dynamic objects:\n\
\n\
argv -- command line arguments; argv[0] is the script pathname if known\n\
path -- module search path; path[0] is the script directory, else ''\n\
modules -- dictionary of loaded modules\n\
\n\
displayhook -- called to show results in an interactive session\n\
excepthook -- called to handle any uncaught exception other than SystemExit\n\
  To customize printing in an interactive session or to install a custom\n\
  top-level exception handler, assign other functions to replace these.\n\
\n\
exitfunc -- if sys.exitfunc exists, this routine is called when Python exits\n\
  Assigning to sys.exitfunc is deprecated; use the atexit module instead.\n\
\n\
stdin -- standard input file object; used by raw_input() and input()\n\
stdout -- standard output file object; used by the print statement\n\
stderr -- standard error object; used for error messages\n\
  By assigning other file objects (or objects that behave like files)\n\
  to these, it is possible to redirect all of the interpreter's I/O.\n\
\n\
last_type -- type of last uncaught exception\n\
last_value -- value of last uncaught exception\n\
last_traceback -- traceback of last uncaught exception\n\
  These three are only available in an interactive session after a\n\
  traceback has been printed.\n\
\n\
exc_type -- type of exception currently being handled\n\
exc_value -- value of exception currently being handled\n\
exc_traceback -- traceback of exception currently being handled\n\
  The function exc_info() should be used instead of these three,\n\
  because it is thread-safe.\n\
"
#ifndef MS_WIN16
/* concatenating string here */
"\n\
Static objects:\n\
\n\
maxint -- the largest supported integer (the smallest is -maxint-1)\n\
maxunicode -- the largest supported character\n\
builtin_module_names -- tuple of module names built into this intepreter\n\
version -- the version of this interpreter as a string\n\
version_info -- version information as a tuple\n\
hexversion -- version information encoded as a single integer\n\
copyright -- copyright notice pertaining to this interpreter\n\
platform -- platform identifier\n\
executable -- pathname of this Python interpreter\n\
prefix -- prefix used to find the Python library\n\
exec_prefix -- prefix used to find the machine-specific Python library\n\
"
#ifdef MS_WINDOWS
/* concatenating string here */
"dllhandle -- [Windows only] integer handle of the Python DLL\n\
winver -- [Windows only] version number of the Python DLL\n\
"
#endif /* MS_WINDOWS */
"__stdin__ -- the original stdin; don't touch!\n\
__stdout__ -- the original stdout; don't touch!\n\
__stderr__ -- the original stderr; don't touch!\n\
__displayhook__ -- the original displayhook; don't touch!\n\
__excepthook__ -- the original excepthook; don't touch!\n\
\n\
Functions:\n\
\n\
displayhook() -- print an object to the screen, and save it in __builtin__._\n\
excepthook() -- print an exception and its traceback to sys.stderr\n\
exc_info() -- return thread-safe information about the current exception\n\
exit() -- exit the interpreter by raising SystemExit\n\
getrefcount() -- return the reference count for an object (plus one :-)\n\
getrecursionlimit() -- return the max recursion depth for the interpreter\n\
setcheckinterval() -- control how often the interpreter checks for events\n\
setprofile() -- set the global profiling function\n\
setrecursionlimit() -- set the max recursion depth for the interpreter\n\
settrace() -- set the global debug tracing function\n\
"
#endif /* MS_WIN16 */
/* end of sys_doc */ ;

PyObject *
_PySys_Init(void)
{
	PyObject *m, *v, *sysdict;
	PyObject *sysin, *sysout, *syserr;
	char *s;

	m = Py_InitModule3("sys", sys_methods, sys_doc);
	sysdict = PyModule_GetDict(m);

	sysin = PyFile_FromFile(stdin, "<stdin>", "r", NULL);
	sysout = PyFile_FromFile(stdout, "<stdout>", "w", NULL);
	syserr = PyFile_FromFile(stderr, "<stderr>", "w", NULL);
	if (PyErr_Occurred())
		return NULL;
	PyDict_SetItemString(sysdict, "stdin", sysin);
	PyDict_SetItemString(sysdict, "stdout", sysout);
	PyDict_SetItemString(sysdict, "stderr", syserr);
	/* Make backup copies for cleanup */
	PyDict_SetItemString(sysdict, "__stdin__", sysin);
	PyDict_SetItemString(sysdict, "__stdout__", sysout);
	PyDict_SetItemString(sysdict, "__stderr__", syserr);
	PyDict_SetItemString(sysdict, "__displayhook__",
                             PyDict_GetItemString(sysdict, "displayhook"));
	PyDict_SetItemString(sysdict, "__excepthook__",
                             PyDict_GetItemString(sysdict, "excepthook"));
	Py_XDECREF(sysin);
	Py_XDECREF(sysout);
	Py_XDECREF(syserr);
	PyDict_SetItemString(sysdict, "version",
			     v = PyString_FromString(Py_GetVersion()));
	Py_XDECREF(v);
	PyDict_SetItemString(sysdict, "hexversion",
			     v = PyInt_FromLong(PY_VERSION_HEX));
	Py_XDECREF(v);
	/*
	 * These release level checks are mutually exclusive and cover
	 * the field, so don't get too fancy with the pre-processor!
	 */
#if PY_RELEASE_LEVEL == PY_RELEASE_LEVEL_ALPHA
	s = "alpha";
#elif PY_RELEASE_LEVEL == PY_RELEASE_LEVEL_BETA
	s = "beta";
#elif PY_RELEASE_LEVEL == PY_RELEASE_LEVEL_GAMMA
	s = "candidate";
#elif PY_RELEASE_LEVEL == PY_RELEASE_LEVEL_FINAL
	s = "final";
#endif
	PyDict_SetItemString(sysdict, "version_info",
			     v = Py_BuildValue("iiisi", PY_MAJOR_VERSION,
					       PY_MINOR_VERSION,
					       PY_MICRO_VERSION, s,
					       PY_RELEASE_SERIAL));
	Py_XDECREF(v);
	PyDict_SetItemString(sysdict, "copyright",
			     v = PyString_FromString(Py_GetCopyright()));
	Py_XDECREF(v);
	PyDict_SetItemString(sysdict, "platform",
			     v = PyString_FromString(Py_GetPlatform()));
	Py_XDECREF(v);
	PyDict_SetItemString(sysdict, "executable",
			     v = PyString_FromString(Py_GetProgramFullPath()));
	Py_XDECREF(v);
	PyDict_SetItemString(sysdict, "prefix",
			     v = PyString_FromString(Py_GetPrefix()));
	Py_XDECREF(v);
	PyDict_SetItemString(sysdict, "exec_prefix",
		   v = PyString_FromString(Py_GetExecPrefix()));
	Py_XDECREF(v);
	PyDict_SetItemString(sysdict, "maxint",
			     v = PyInt_FromLong(PyInt_GetMax()));
	Py_XDECREF(v);
	PyDict_SetItemString(sysdict, "maxunicode",
			     v = PyInt_FromLong(PyUnicode_GetMax()));
	Py_XDECREF(v);
	PyDict_SetItemString(sysdict, "builtin_module_names",
		   v = list_builtin_module_names());
	Py_XDECREF(v);
	{
		/* Assumes that longs are at least 2 bytes long.
		   Should be safe! */
		unsigned long number = 1;
		char *value;

		s = (char *) &number;
		if (s[0] == 0)
			value = "big";
		else
			value = "little";
		PyDict_SetItemString(sysdict, "byteorder",
				     v = PyString_FromString(value));
		Py_XDECREF(v);
	}
#ifdef MS_COREDLL
	PyDict_SetItemString(sysdict, "dllhandle",
			     v = PyLong_FromVoidPtr(PyWin_DLLhModule));
	Py_XDECREF(v);
	PyDict_SetItemString(sysdict, "winver",
			     v = PyString_FromString(PyWin_DLLVersionString));
	Py_XDECREF(v);
#endif
	if (warnoptions == NULL) {
		warnoptions = PyList_New(0);
	}
	else {
		Py_INCREF(warnoptions);
	}
	if (warnoptions != NULL) {
		PyDict_SetItemString(sysdict, "warnoptions", warnoptions);
	}
	
	if (PyErr_Occurred())
		return NULL;
	return m;
}

static PyObject *
makepathobject(char *path, int delim)
{
	int i, n;
	char *p;
	PyObject *v, *w;
	
	n = 1;
	p = path;
	while ((p = strchr(p, delim)) != NULL) {
		n++;
		p++;
	}
	v = PyList_New(n);
	if (v == NULL)
		return NULL;
	for (i = 0; ; i++) {
		p = strchr(path, delim);
		if (p == NULL)
			p = strchr(path, '\0'); /* End of string */
		w = PyString_FromStringAndSize(path, (int) (p - path));
		if (w == NULL) {
			Py_DECREF(v);
			return NULL;
		}
		PyList_SetItem(v, i, w);
		if (*p == '\0')
			break;
		path = p+1;
	}
	return v;
}

void
PySys_SetPath(char *path)
{
	PyObject *v;
	if ((v = makepathobject(path, DELIM)) == NULL)
		Py_FatalError("can't create sys.path");
	if (PySys_SetObject("path", v) != 0)
		Py_FatalError("can't assign sys.path");
	Py_DECREF(v);
}

static PyObject *
makeargvobject(int argc, char **argv)
{
	PyObject *av;
	if (argc <= 0 || argv == NULL) {
		/* Ensure at least one (empty) argument is seen */
		static char *empty_argv[1] = {""};
		argv = empty_argv;
		argc = 1;
	}
	av = PyList_New(argc);
	if (av != NULL) {
		int i;
		for (i = 0; i < argc; i++) {
			PyObject *v = PyString_FromString(argv[i]);
			if (v == NULL) {
				Py_DECREF(av);
				av = NULL;
				break;
			}
			PyList_SetItem(av, i, v);
		}
	}
	return av;
}

void
PySys_SetArgv(int argc, char **argv)
{
	PyObject *av = makeargvobject(argc, argv);
	PyObject *path = PySys_GetObject("path");
	if (av == NULL)
		Py_FatalError("no mem for sys.argv");
	if (PySys_SetObject("argv", av) != 0)
		Py_FatalError("can't assign sys.argv");
	if (path != NULL) {
		char *argv0 = argv[0];
		char *p = NULL;
		int n = 0;
		PyObject *a;
#ifdef HAVE_READLINK
		char link[MAXPATHLEN+1];
		char argv0copy[2*MAXPATHLEN+1];
		int nr = 0;
		if (argc > 0 && argv0 != NULL)
			nr = readlink(argv0, link, MAXPATHLEN);
		if (nr > 0) {
			/* It's a symlink */
			link[nr] = '\0';
			if (link[0] == SEP)
				argv0 = link; /* Link to absolute path */
			else if (strchr(link, SEP) == NULL)
				; /* Link without path */
			else {
				/* Must join(dirname(argv0), link) */
				char *q = strrchr(argv0, SEP);
				if (q == NULL)
					argv0 = link; /* argv0 without path */
				else {
					/* Must make a copy */
					strcpy(argv0copy, argv0);
					q = strrchr(argv0copy, SEP);
					strcpy(q+1, link);
					argv0 = argv0copy;
				}
			}
		}
#endif /* HAVE_READLINK */
#if SEP == '\\' /* Special case for MS filename syntax */
		if (argc > 0 && argv0 != NULL) {
			char *q;
			p = strrchr(argv0, SEP);
			/* Test for alternate separator */
			q = strrchr(p ? p : argv0, '/');
			if (q != NULL)
				p = q;
			if (p != NULL) {
				n = p + 1 - argv0;
				if (n > 1 && p[-1] != ':')
					n--; /* Drop trailing separator */
			}
		}
#else /* All other filename syntaxes */
		if (argc > 0 && argv0 != NULL)
			p = strrchr(argv0, SEP);
		if (p != NULL) {
#ifndef RISCOS
			n = p + 1 - argv0;
#else /* don't include trailing separator */
			n = p - argv0;
#endif /* RISCOS */
#if SEP == '/' /* Special case for Unix filename syntax */
			if (n > 1)
				n--; /* Drop trailing separator */
#endif /* Unix */
		}
#endif /* All others */
		a = PyString_FromStringAndSize(argv0, n);
		if (a == NULL)
			Py_FatalError("no mem for sys.path insertion");
		if (PyList_Insert(path, 0, a) < 0)
			Py_FatalError("sys.path.insert(0) failed");
		Py_DECREF(a);
	}
	Py_DECREF(av);
}


/* APIs to write to sys.stdout or sys.stderr using a printf-like interface.
   Adapted from code submitted by Just van Rossum.

   PySys_WriteStdout(format, ...)
   PySys_WriteStderr(format, ...)

      The first function writes to sys.stdout; the second to sys.stderr.  When
      there is a problem, they write to the real (C level) stdout or stderr;
      no exceptions are raised.

      Both take a printf-style format string as their first argument followed
      by a variable length argument list determined by the format string.

      *** WARNING ***

      The format should limit the total size of the formatted output string to
      1000 bytes.  In particular, this means that no unrestricted "%s" formats
      should occur; these should be limited using "%.<N>s where <N> is a
      decimal number calculated so that <N> plus the maximum size of other
      formatted text does not exceed 1000 bytes.  Also watch out for "%f",
      which can print hundreds of digits for very large numbers.

 */

static void
mywrite(char *name, FILE *fp, const char *format, va_list va)
{
	PyObject *file;
	PyObject *error_type, *error_value, *error_traceback;

	PyErr_Fetch(&error_type, &error_value, &error_traceback);
	file = PySys_GetObject(name);
	if (file == NULL || PyFile_AsFile(file) == fp)
		vfprintf(fp, format, va);
	else {
		char buffer[1001];
		if (vsprintf(buffer, format, va) >= sizeof(buffer))
		    Py_FatalError("PySys_WriteStdout/err: buffer overrun");
		if (PyFile_WriteString(buffer, file) != 0) {
			PyErr_Clear();
			fputs(buffer, fp);
		}
	}
	PyErr_Restore(error_type, error_value, error_traceback);
}

void
PySys_WriteStdout(const char *format, ...)
{
	va_list va;

	va_start(va, format);
	mywrite("stdout", stdout, format, va);
	va_end(va);
}

void
PySys_WriteStderr(const char *format, ...)
{
	va_list va;

	va_start(va, format);
	mywrite("stderr", stderr, format, va);
	va_end(va);
}