summaryrefslogtreecommitdiffstats
path: root/Modules/main.c
blob: 59b0e9f2ed57e598f52e6a7dd3a36a1b7ba27596 (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
/* Python interpreter main program */

#include "Python.h"
#include "osdefs.h"
#include "code.h" /* For CO_FUTURE_DIVISION */
#include "import.h"

#ifdef __VMS
#include <unixlib.h>
#endif

#if defined(MS_WINDOWS) || defined(__CYGWIN__)
#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#endif
#endif

#if (defined(PYOS_OS2) && !defined(PYCC_GCC)) || defined(MS_WINDOWS)
#define PYTHONHOMEHELP "<prefix>\\lib"
#else
#if defined(PYOS_OS2) && defined(PYCC_GCC)
#define PYTHONHOMEHELP "<prefix>/Lib"
#else
#define PYTHONHOMEHELP "<prefix>/pythonX.X"
#endif
#endif

#include "pygetopt.h"

#define COPYRIGHT \
    "Type \"help\", \"copyright\", \"credits\" or \"license\" " \
    "for more information."

#ifdef __cplusplus
extern "C" {
#endif

/* For Py_GetArgcArgv(); set by main() */
static char **orig_argv;
static int  orig_argc;

/* command line options */
#define BASE_OPTS "3c:dEhim:OQ:StuUvVW:xX?"

#ifndef RISCOS
#define PROGRAM_OPTS BASE_OPTS
#else /*RISCOS*/
/* extra option saying that we are running under a special task window
   frontend; especially my_readline will behave different */
#define PROGRAM_OPTS BASE_OPTS "w"
/* corresponding flag */
extern int Py_RISCOSWimpFlag;
#endif /*RISCOS*/

/* Short usage message (with %s for argv0) */
static char *usage_line =
"usage: %s [option] ... [-c cmd | -m mod | file | -] [arg] ...\n";

/* Long usage message, split into parts < 512 bytes */
static char *usage_1 = "\
Options and arguments (and corresponding environment variables):\n\
-c cmd : program passed in as string (terminates option list)\n\
-d     : debug output from parser; also PYTHONDEBUG=x\n\
-E     : ignore environment variables (such as PYTHONPATH)\n\
-h     : print this help message and exit (also --help)\n\
-i     : inspect interactively after running script; forces a prompt even\n\
         if stdin does not appear to be a terminal; also PYTHONINSPECT=x\n\
";
static char *usage_2 = "\
-m mod : run library module as a script (terminates option list)\n\
-O     : optimize generated bytecode slightly; also PYTHONOPTIMIZE=x\n\
-OO    : remove doc-strings in addition to the -O optimizations\n\
-Q arg : division options: -Qold (default), -Qwarn, -Qwarnall, -Qnew\n\
-S     : don't imply 'import site' on initialization\n\
-t     : issue warnings about inconsistent tab usage (-tt: issue errors)\n\
-u     : unbuffered binary stdout and stderr; also PYTHONUNBUFFERED=x\n\
";
static char *usage_3 = "\
         see man page for details on internal buffering relating to '-u'\n\
-v     : verbose (trace import statements); also PYTHONVERBOSE=x\n\
         can be supplied multiple times to increase verbosity\n\
-V     : print the Python version number and exit (also --version)\n\
-W arg : warning control; arg is action:message:category:module:lineno\n\
-x     : skip first line of source, allowing use of non-Unix forms of #!cmd\n\
-3     : warn about Python 3.x incompatibilities\n\
file   : program read from script file\n\
-      : program read from stdin (default; interactive mode if a tty)\n\
";
static char *usage_4 = "\
arg ...: arguments passed to program in sys.argv[1:]\n\n\
Other environment variables:\n\
PYTHONSTARTUP: file executed on interactive startup (no default)\n\
PYTHONPATH   : '%c'-separated list of directories prefixed to the\n\
               default module search path.  The result is sys.path.\n\
PYTHONHOME   : alternate <prefix> directory (or <prefix>%c<exec_prefix>).\n\
               The default module search path uses %s.\n\
PYTHONCASEOK : ignore case in 'import' statements (Windows).\n\
";


static int
usage(int exitcode, char* program)
{
	FILE *f = exitcode ? stderr : stdout;

	fprintf(f, usage_line, program);
	if (exitcode)
		fprintf(f, "Try `python -h' for more information.\n");
	else {
		fprintf(f, usage_1);
		fprintf(f, usage_2);
		fprintf(f, usage_3);
		fprintf(f, usage_4, DELIM, DELIM, PYTHONHOMEHELP);
	}
#if defined(__VMS)
	if (exitcode == 0) {
		/* suppress 'error' message */
		return 1;
	}
	else {
		/* STS$M_INHIB_MSG + SS$_ABORT */
		return 0x1000002c;
	}
#else
	return exitcode;
#endif
	/*NOTREACHED*/
}

static void RunStartupFile(PyCompilerFlags *cf)
{
	char *startup = Py_GETENV("PYTHONSTARTUP");
	if (startup != NULL && startup[0] != '\0') {
		FILE *fp = fopen(startup, "r");
		if (fp != NULL) {
			(void) PyRun_SimpleFileExFlags(fp, startup, 0, cf);
			PyErr_Clear();
			fclose(fp);
		}
	}
}


static int RunModule(char *module)
{
	PyObject *runpy, *runmodule, *runargs, *result;
	runpy = PyImport_ImportModule("runpy");
	if (runpy == NULL) {
		fprintf(stderr, "Could not import runpy module\n");
		return -1;
	}
	runmodule = PyObject_GetAttrString(runpy, "_run_module_as_main");
	if (runmodule == NULL) {
		fprintf(stderr, "Could not access runpy._run_module_as_main\n");
		Py_DECREF(runpy);
		return -1;
	}
	runargs = Py_BuildValue("(s)", module);
	if (runargs == NULL) {
		fprintf(stderr,
			"Could not create arguments for runpy._run_module_as_main\n");
		Py_DECREF(runpy);
		Py_DECREF(runmodule);
		return -1;
	}
	result = PyObject_Call(runmodule, runargs, NULL);
	if (result == NULL) {
		PyErr_Print();
	}
	Py_DECREF(runpy);
	Py_DECREF(runmodule);
	Py_DECREF(runargs);
	if (result == NULL) {
		return -1;
	}
	Py_DECREF(result);
	return 0;
}

/* 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. */
#include "abstract.h"
static void
WaitForThreadShutdown(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
}

/* Main program */

int
Py_Main(int argc, char **argv)
{
	int c;
	int sts;
	char *command = NULL;
	char *filename = NULL;
	char *module = NULL;
	FILE *fp = stdin;
	char *p;
	int unbuffered = 0;
	int skipfirstline = 0;
	int stdin_is_interactive = 0;
	int help = 0;
	int version = 0;
	int saw_unbuffered_flag = 0;
	PyCompilerFlags cf;

	cf.cf_flags = 0;

	orig_argc = argc;	/* For Py_GetArgcArgv() */
	orig_argv = argv;

#ifdef RISCOS
	Py_RISCOSWimpFlag = 0;
#endif

	PySys_ResetWarnOptions();

	while ((c = _PyOS_GetOpt(argc, argv, PROGRAM_OPTS)) != EOF) {
		if (c == 'c') {
			/* -c is the last option; following arguments
			   that look like options are left for the
			   command to interpret. */
			command = (char *)malloc(strlen(_PyOS_optarg) + 2);
			if (command == NULL)
				Py_FatalError(
				   "not enough memory to copy -c argument");
			strcpy(command, _PyOS_optarg);
			strcat(command, "\n");
			break;
		}

		if (c == 'm') {
			/* -m is the last option; following arguments
			   that look like options are left for the
			   module to interpret. */
			module = (char *)malloc(strlen(_PyOS_optarg) + 2);
			if (module == NULL)
				Py_FatalError(
				   "not enough memory to copy -m argument");
			strcpy(module, _PyOS_optarg);
			break;
		}

		switch (c) {

		case 'd':
			Py_DebugFlag++;
			break;

		case '3':
			Py_Py3kWarningFlag++;
			break;

		case 'Q':
			if (strcmp(_PyOS_optarg, "old") == 0) {
				Py_DivisionWarningFlag = 0;
				break;
			}
			if (strcmp(_PyOS_optarg, "warn") == 0) {
				Py_DivisionWarningFlag = 1;
				break;
			}
			if (strcmp(_PyOS_optarg, "warnall") == 0) {
				Py_DivisionWarningFlag = 2;
				break;
			}
			if (strcmp(_PyOS_optarg, "new") == 0) {
				/* This only affects __main__ */
				cf.cf_flags |= CO_FUTURE_DIVISION;
				/* And this tells the eval loop to treat
				   BINARY_DIVIDE as BINARY_TRUE_DIVIDE */
				_Py_QnewFlag = 1;
				break;
			}
			fprintf(stderr,
				"-Q option should be `-Qold', "
				"`-Qwarn', `-Qwarnall', or `-Qnew' only\n");
			return usage(2, argv[0]);
			/* NOTREACHED */

		case 'i':
			Py_InspectFlag++;
			Py_InteractiveFlag++;
			break;

		case 'O':
			Py_OptimizeFlag++;
			break;

		case 'S':
			Py_NoSiteFlag++;
			break;

		case 'E':
			Py_IgnoreEnvironmentFlag++;
			break;

		case 't':
			Py_TabcheckFlag++;
			break;

		case 'u':
			unbuffered++;
			saw_unbuffered_flag = 1;
			break;

		case 'v':
			Py_VerboseFlag++;
			break;

#ifdef RISCOS
		case 'w':
			Py_RISCOSWimpFlag = 1;
			break;
#endif

		case 'x':
			skipfirstline = 1;
			break;

		case 'U':
			Py_UnicodeFlag++;
			break;
		case 'h':
		case '?':
			help++;
			break;
		case 'V':
			version++;
			break;

		case 'W':
			PySys_AddWarnOption(_PyOS_optarg);
			break;

		/* This space reserved for other options */

		default:
			return usage(2, argv[0]);
			/*NOTREACHED*/

		}
	}

	if (help)
		return usage(0, argv[0]);

	if (version) {
		fprintf(stderr, "Python %s\n", PY_VERSION);
		return 0;
	}

	if (!Py_InspectFlag &&
	    (p = Py_GETENV("PYTHONINSPECT")) && *p != '\0')
		Py_InspectFlag = 1;
	if (!saw_unbuffered_flag &&
	    (p = Py_GETENV("PYTHONUNBUFFERED")) && *p != '\0')
		unbuffered = 1;

	if (command == NULL && module == NULL && _PyOS_optind < argc &&
	    strcmp(argv[_PyOS_optind], "-") != 0)
	{
#ifdef __VMS
		filename = decc$translate_vms(argv[_PyOS_optind]);
		if (filename == (char *)0 || filename == (char *)-1)
			filename = argv[_PyOS_optind];

#else
		filename = argv[_PyOS_optind];
#endif
		if (filename != NULL) {
			if ((fp = fopen(filename, "r")) == NULL) {
#ifdef HAVE_STRERROR
				fprintf(stderr, "%s: can't open file '%s': [Errno %d] %s\n",
					argv[0], filename, errno, strerror(errno));
#else
				fprintf(stderr, "%s: can't open file '%s': Errno %d\n",
					argv[0], filename, errno);
#endif
				return 2;
			}
			else if (skipfirstline) {
				int ch;
				/* Push back first newline so line numbers
				   remain the same */
				while ((ch = getc(fp)) != EOF) {
					if (ch == '\n') {
						(void)ungetc(ch, fp);
						break;
					}
				}
			}
			{
				/* XXX: does this work on Win/Win64? (see posix_fstat) */
				struct stat sb;
				if (fstat(fileno(fp), &sb) == 0 &&
				    S_ISDIR(sb.st_mode)) {
					fprintf(stderr, "%s: '%s' is a directory, cannot continue\n", argv[0], filename);
					return 1;
				}
			}
		}
	}

	stdin_is_interactive = Py_FdIsInteractive(stdin, (char *)0);

	if (unbuffered) {
#if defined(MS_WINDOWS) || defined(__CYGWIN__)
		_setmode(fileno(stdin), O_BINARY);
		_setmode(fileno(stdout), O_BINARY);
#endif
#ifdef HAVE_SETVBUF
		setvbuf(stdin,  (char *)NULL, _IONBF, BUFSIZ);
		setvbuf(stdout, (char *)NULL, _IONBF, BUFSIZ);
		setvbuf(stderr, (char *)NULL, _IONBF, BUFSIZ);
#else /* !HAVE_SETVBUF */
		setbuf(stdin,  (char *)NULL);
		setbuf(stdout, (char *)NULL);
		setbuf(stderr, (char *)NULL);
#endif /* !HAVE_SETVBUF */
	}
	else if (Py_InteractiveFlag) {
#ifdef MS_WINDOWS
		/* Doesn't have to have line-buffered -- use unbuffered */
		/* Any set[v]buf(stdin, ...) screws up Tkinter :-( */
		setvbuf(stdout, (char *)NULL, _IONBF, BUFSIZ);
#else /* !MS_WINDOWS */
#ifdef HAVE_SETVBUF
		setvbuf(stdin,  (char *)NULL, _IOLBF, BUFSIZ);
		setvbuf(stdout, (char *)NULL, _IOLBF, BUFSIZ);
#endif /* HAVE_SETVBUF */
#endif /* !MS_WINDOWS */
		/* Leave stderr alone - it should be unbuffered anyway. */
  	}
#ifdef __VMS
	else {
		setvbuf (stdout, (char *)NULL, _IOLBF, BUFSIZ);
	}
#endif /* __VMS */

#ifdef __APPLE__
	/* On MacOS X, when the Python interpreter is embedded in an
	   application bundle, it gets executed by a bootstrapping script
	   that does os.execve() with an argv[0] that's different from the
	   actual Python executable. This is needed to keep the Finder happy,
	   or rather, to work around Apple's overly strict requirements of
	   the process name. However, we still need a usable sys.executable,
	   so the actual executable path is passed in an environment variable.
	   See Lib/plat-mac/bundlebuiler.py for details about the bootstrap
	   script. */
	if ((p = Py_GETENV("PYTHONEXECUTABLE")) && *p != '\0')
		Py_SetProgramName(p);
	else
		Py_SetProgramName(argv[0]);
#else
	Py_SetProgramName(argv[0]);
#endif
	Py_Initialize();

	if (Py_VerboseFlag ||
	    (command == NULL && filename == NULL && module == NULL && stdin_is_interactive)) {
		fprintf(stderr, "Python %s on %s\n",
			Py_GetVersion(), Py_GetPlatform());
 		if (!Py_NoSiteFlag)
 			fprintf(stderr, "%s\n", COPYRIGHT);
	}

	if (command != NULL) {
		/* Backup _PyOS_optind and force sys.argv[0] = '-c' */
		_PyOS_optind--;
		argv[_PyOS_optind] = "-c";
	}

	if (module != NULL) {
		/* Backup _PyOS_optind and force sys.argv[0] = '-c'
		   so that PySys_SetArgv correctly sets sys.path[0] to ''*/
		_PyOS_optind--;
		argv[_PyOS_optind] = "-c";
	}

	PySys_SetArgv(argc-_PyOS_optind, argv+_PyOS_optind);

	if ((Py_InspectFlag || (command == NULL && filename == NULL && module == NULL)) &&
	    isatty(fileno(stdin))) {
		PyObject *v;
		v = PyImport_ImportModule("readline");
		if (v == NULL)
			PyErr_Clear();
		else
			Py_DECREF(v);
	}

	if (command) {
		sts = PyRun_SimpleStringFlags(command, &cf) != 0;
		free(command);
	} else if (module) {
		sts = RunModule(module);
		free(module);
	}
	else {
		if (filename == NULL && stdin_is_interactive) {
			Py_InspectFlag = 0; /* do exit on SystemExit */
			RunStartupFile(&cf);
		}
		/* XXX */
		sts = PyRun_AnyFileExFlags(
			fp,
			filename == NULL ? "<stdin>" : filename,
			filename != NULL, &cf) != 0;
	}

	/* Check this environment variable at the end, to give programs the
	 * opportunity to set it from Python.
	 */
	if (!Py_InspectFlag &&
	    (p = Py_GETENV("PYTHONINSPECT")) && *p != '\0')
	{
		Py_InspectFlag = 1;
	}

	if (Py_InspectFlag && stdin_is_interactive &&
	    (filename != NULL || command != NULL || module != NULL)) {
		Py_InspectFlag = 0;
		/* XXX */
		sts = PyRun_AnyFileFlags(stdin, "<stdin>", &cf) != 0;
	}

	WaitForThreadShutdown();

	Py_Finalize();
#ifdef RISCOS
	if (Py_RISCOSWimpFlag)
                fprintf(stderr, "\x0cq\x0c"); /* make frontend quit */
#endif

#ifdef __INSURE__
	/* Insure++ is a memory analysis tool that aids in discovering
	 * memory leaks and other memory problems.  On Python exit, the
	 * interned string dictionary is flagged as being in use at exit
	 * (which it is).  Under normal circumstances, this is fine because
	 * the memory will be automatically reclaimed by the system.  Under
	 * memory debugging, it's a huge source of useless noise, so we
	 * trade off slower shutdown for less distraction in the memory
	 * reports.  -baw
	 */
	_Py_ReleaseInternedStrings();
#endif /* __INSURE__ */

	return sts;
}

/* this is gonna seem *real weird*, but if you put some other code between
   Py_Main() and Py_GetArgcArgv() you will need to adjust the test in the
   while statement in Misc/gdbinit:ppystack */

/* Make the *original* argc/argv available to other modules.
   This is rare, but it is needed by the secureware extension. */

void
Py_GetArgcArgv(int *argc, char ***argv)
{
	*argc = orig_argc;
	*argv = orig_argv;
}

#ifdef __cplusplus
}
#endif