forked from python/cpython
-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathposixmodule.c
13806 lines (11729 loc) · 354 KB
/
posixmodule.c
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
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/* POSIX module implementation */
/* This file is also used for Windows NT/MS-Win. In that case the
module actually calls itself 'nt', not 'posix', and a few
functions are either unimplemented or implemented differently. The source
assumes that for Windows NT, the macro 'MS_WINDOWS' is defined independent
of the compiler used. Different compilers define their own feature
test macro, e.g. '_MSC_VER'. */
#ifdef __APPLE__
/*
* Step 1 of support for weak-linking a number of symbols existing on
* OSX 10.4 and later, see the comment in the #ifdef __APPLE__ block
* at the end of this file for more information.
*/
# pragma weak lchown
# pragma weak statvfs
# pragma weak fstatvfs
#endif /* __APPLE__ */
#define PY_SSIZE_T_CLEAN
#include "Python.h"
#include "pythread.h"
#include "structmember.h"
#ifndef MS_WINDOWS
#include "posixmodule.h"
#else
#include "winreparse.h"
#endif
/* On android API level 21, 'AT_EACCESS' is not declared although
* HAVE_FACCESSAT is defined. */
#ifdef __ANDROID__
#undef HAVE_FACCESSAT
#endif
#include <stdio.h> /* needed for ctermid() */
#ifdef __cplusplus
extern "C" {
#endif
PyDoc_STRVAR(posix__doc__,
"This module provides access to operating system functionality that is\n\
standardized by the C Standard and the POSIX standard (a thinly\n\
disguised Unix interface). Refer to the library manual and\n\
corresponding Unix manual entries for more information on calls.");
#ifdef HAVE_SYS_UIO_H
#include <sys/uio.h>
#endif
#ifdef HAVE_SYS_SYSMACROS_H
/* GNU C Library: major(), minor(), makedev() */
#include <sys/sysmacros.h>
#endif
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif /* HAVE_SYS_TYPES_H */
#ifdef HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif /* HAVE_SYS_STAT_H */
#ifdef HAVE_SYS_WAIT_H
#include <sys/wait.h> /* For WNOHANG */
#endif
#ifdef HAVE_SIGNAL_H
#include <signal.h>
#endif
#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#endif /* HAVE_FCNTL_H */
#ifdef HAVE_GRP_H
#include <grp.h>
#endif
#ifdef HAVE_SYSEXITS_H
#include <sysexits.h>
#endif /* HAVE_SYSEXITS_H */
#ifdef HAVE_SYS_LOADAVG_H
#include <sys/loadavg.h>
#endif
#ifdef HAVE_SYS_SENDFILE_H
#include <sys/sendfile.h>
#endif
#ifdef HAVE_SCHED_H
#include <sched.h>
#endif
#if !defined(CPU_ALLOC) && defined(HAVE_SCHED_SETAFFINITY)
#undef HAVE_SCHED_SETAFFINITY
#endif
#if defined(HAVE_SYS_XATTR_H) && defined(__GLIBC__) && !defined(__FreeBSD_kernel__) && !defined(__GNU__)
#define USE_XATTRS
#endif
#ifdef USE_XATTRS
#include <sys/xattr.h>
#endif
#if defined(__FreeBSD__) || defined(__DragonFly__) || defined(__APPLE__)
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#endif
#ifdef HAVE_DLFCN_H
#include <dlfcn.h>
#endif
#ifdef __hpux
#include <sys/mpctl.h>
#endif
#if defined(__DragonFly__) || \
defined(__OpenBSD__) || \
defined(__FreeBSD__) || \
defined(__NetBSD__) || \
defined(__APPLE__)
#include <sys/sysctl.h>
#endif
#ifdef HAVE_LINUX_RANDOM_H
# include <linux/random.h>
#endif
#ifdef HAVE_GETRANDOM_SYSCALL
# include <sys/syscall.h>
#endif
#if defined(MS_WINDOWS)
# define TERMSIZE_USE_CONIO
#elif defined(HAVE_SYS_IOCTL_H)
# include <sys/ioctl.h>
# if defined(HAVE_TERMIOS_H)
# include <termios.h>
# endif
# if defined(TIOCGWINSZ)
# define TERMSIZE_USE_IOCTL
# endif
#endif /* MS_WINDOWS */
/* Various compilers have only certain posix functions */
/* XXX Gosh I wish these were all moved into pyconfig.h */
#if defined(__WATCOMC__) && !defined(__QNX__) /* Watcom compiler */
#define HAVE_OPENDIR 1
#define HAVE_SYSTEM 1
#include <process.h>
#else
#ifdef _MSC_VER /* Microsoft compiler */
#define HAVE_GETPPID 1
#define HAVE_GETLOGIN 1
#define HAVE_SPAWNV 1
#define HAVE_EXECV 1
#define HAVE_WSPAWNV 1
#define HAVE_WEXECV 1
#define HAVE_PIPE 1
#define HAVE_SYSTEM 1
#define HAVE_CWAIT 1
#define HAVE_FSYNC 1
#define fsync _commit
#else
/* Unix functions that the configure script doesn't check for */
#define HAVE_EXECV 1
#define HAVE_FORK 1
#if defined(__USLC__) && defined(__SCO_VERSION__) /* SCO UDK Compiler */
#define HAVE_FORK1 1
#endif
#define HAVE_GETEGID 1
#define HAVE_GETEUID 1
#define HAVE_GETGID 1
#define HAVE_GETPPID 1
#define HAVE_GETUID 1
#define HAVE_KILL 1
#define HAVE_OPENDIR 1
#define HAVE_PIPE 1
#define HAVE_SYSTEM 1
#define HAVE_WAIT 1
#define HAVE_TTYNAME 1
#endif /* _MSC_VER */
#endif /* ! __WATCOMC__ || __QNX__ */
/*[clinic input]
# one of the few times we lie about this name!
module os
[clinic start generated code]*/
/*[clinic end generated code: output=da39a3ee5e6b4b0d input=94a0f0f978acae17]*/
#ifndef _MSC_VER
#if defined(__sgi)&&_COMPILER_VERSION>=700
/* declare ctermid_r if compiling with MIPSPro 7.x in ANSI C mode
(default) */
extern char *ctermid_r(char *);
#endif
#ifndef HAVE_UNISTD_H
#if ( defined(__WATCOMC__) || defined(_MSC_VER) ) && !defined(__QNX__)
extern int mkdir(const char *);
#else
extern int mkdir(const char *, mode_t);
#endif
#if defined(__IBMC__) || defined(__IBMCPP__)
extern int chdir(char *);
extern int rmdir(char *);
#else
extern int chdir(const char *);
extern int rmdir(const char *);
#endif
extern int chmod(const char *, mode_t);
/*#ifdef HAVE_FCHMOD
extern int fchmod(int, mode_t);
#endif*/
/*#ifdef HAVE_LCHMOD
extern int lchmod(const char *, mode_t);
#endif*/
extern int chown(const char *, uid_t, gid_t);
extern char *getcwd(char *, int);
extern char *strerror(int);
extern int link(const char *, const char *);
extern int rename(const char *, const char *);
extern int stat(const char *, struct stat *);
extern int unlink(const char *);
#ifdef HAVE_SYMLINK
extern int symlink(const char *, const char *);
#endif /* HAVE_SYMLINK */
#ifdef HAVE_LSTAT
extern int lstat(const char *, struct stat *);
#endif /* HAVE_LSTAT */
#endif /* !HAVE_UNISTD_H */
#endif /* !_MSC_VER */
#ifdef HAVE_POSIX_SPAWN
#include <spawn.h>
#endif
#ifdef HAVE_UTIME_H
#include <utime.h>
#endif /* HAVE_UTIME_H */
#ifdef HAVE_SYS_UTIME_H
#include <sys/utime.h>
#define HAVE_UTIME_H /* pretend we do for the rest of this file */
#endif /* HAVE_SYS_UTIME_H */
#ifdef HAVE_SYS_TIMES_H
#include <sys/times.h>
#endif /* HAVE_SYS_TIMES_H */
#ifdef HAVE_SYS_PARAM_H
#include <sys/param.h>
#endif /* HAVE_SYS_PARAM_H */
#ifdef HAVE_SYS_UTSNAME_H
#include <sys/utsname.h>
#endif /* HAVE_SYS_UTSNAME_H */
#ifdef HAVE_DIRENT_H
#include <dirent.h>
#define NAMLEN(dirent) strlen((dirent)->d_name)
#else
#if defined(__WATCOMC__) && !defined(__QNX__)
#include <direct.h>
#define NAMLEN(dirent) strlen((dirent)->d_name)
#else
#define dirent direct
#define NAMLEN(dirent) (dirent)->d_namlen
#endif
#ifdef HAVE_SYS_NDIR_H
#include <sys/ndir.h>
#endif
#ifdef HAVE_SYS_DIR_H
#include <sys/dir.h>
#endif
#ifdef HAVE_NDIR_H
#include <ndir.h>
#endif
#endif
#ifdef _MSC_VER
#ifdef HAVE_DIRECT_H
#include <direct.h>
#endif
#ifdef HAVE_IO_H
#include <io.h>
#endif
#ifdef HAVE_PROCESS_H
#include <process.h>
#endif
#ifndef VOLUME_NAME_DOS
#define VOLUME_NAME_DOS 0x0
#endif
#ifndef VOLUME_NAME_NT
#define VOLUME_NAME_NT 0x2
#endif
#ifndef IO_REPARSE_TAG_SYMLINK
#define IO_REPARSE_TAG_SYMLINK (0xA000000CL)
#endif
#ifndef IO_REPARSE_TAG_MOUNT_POINT
#define IO_REPARSE_TAG_MOUNT_POINT (0xA0000003L)
#endif
#include "osdefs.h"
#include <malloc.h>
#include <windows.h>
#include <shellapi.h> /* for ShellExecute() */
#include <lmcons.h> /* for UNLEN */
#ifdef SE_CREATE_SYMBOLIC_LINK_NAME /* Available starting with Vista */
#define HAVE_SYMLINK
static int win32_can_symlink = 0;
#endif
#endif /* _MSC_VER */
#ifndef MAXPATHLEN
#if defined(PATH_MAX) && PATH_MAX > 1024
#define MAXPATHLEN PATH_MAX
#else
#define MAXPATHLEN 1024
#endif
#endif /* MAXPATHLEN */
#ifdef UNION_WAIT
/* Emulate some macros on systems that have a union instead of macros */
#ifndef WIFEXITED
#define WIFEXITED(u_wait) (!(u_wait).w_termsig && !(u_wait).w_coredump)
#endif
#ifndef WEXITSTATUS
#define WEXITSTATUS(u_wait) (WIFEXITED(u_wait)?((u_wait).w_retcode):-1)
#endif
#ifndef WTERMSIG
#define WTERMSIG(u_wait) ((u_wait).w_termsig)
#endif
#define WAIT_TYPE union wait
#define WAIT_STATUS_INT(s) (s.w_status)
#else /* !UNION_WAIT */
#define WAIT_TYPE int
#define WAIT_STATUS_INT(s) (s)
#endif /* UNION_WAIT */
/* Don't use the "_r" form if we don't need it (also, won't have a
prototype for it, at least on Solaris -- maybe others as well?). */
#if defined(HAVE_CTERMID_R)
#define USE_CTERMID_R
#endif
/* choose the appropriate stat and fstat functions and return structs */
#undef STAT
#undef FSTAT
#undef STRUCT_STAT
#ifdef MS_WINDOWS
# define STAT win32_stat
# define LSTAT win32_lstat
# define FSTAT _Py_fstat_noraise
# define STRUCT_STAT struct _Py_stat_struct
#else
# define STAT stat
# define LSTAT lstat
# define FSTAT fstat
# define STRUCT_STAT struct stat
#endif
#if defined(MAJOR_IN_MKDEV)
#include <sys/mkdev.h>
#else
#if defined(MAJOR_IN_SYSMACROS)
#include <sys/sysmacros.h>
#endif
#if defined(HAVE_MKNOD) && defined(HAVE_SYS_MKDEV_H)
#include <sys/mkdev.h>
#endif
#endif
#ifdef MS_WINDOWS
#define INITFUNC PyInit_nt
#define MODNAME "nt"
#else
#define INITFUNC PyInit_posix
#define MODNAME "posix"
#endif
#if defined(__sun)
/* Something to implement in autoconf, not present in autoconf 2.69 */
#define HAVE_STRUCT_STAT_ST_FSTYPE 1
#endif
#ifdef HAVE_FORK
static void
run_at_forkers(PyObject *lst, int reverse)
{
Py_ssize_t i;
PyObject *cpy;
if (lst != NULL) {
assert(PyList_CheckExact(lst));
/* Use a list copy in case register_at_fork() is called from
* one of the callbacks.
*/
cpy = PyList_GetSlice(lst, 0, PyList_GET_SIZE(lst));
if (cpy == NULL)
PyErr_WriteUnraisable(lst);
else {
if (reverse)
PyList_Reverse(cpy);
for (i = 0; i < PyList_GET_SIZE(cpy); i++) {
PyObject *func, *res;
func = PyList_GET_ITEM(cpy, i);
res = PyObject_CallObject(func, NULL);
if (res == NULL)
PyErr_WriteUnraisable(func);
else
Py_DECREF(res);
}
Py_DECREF(cpy);
}
}
}
void
PyOS_BeforeFork(void)
{
run_at_forkers(PyThreadState_Get()->interp->before_forkers, 1);
_PyImport_AcquireLock();
}
void
PyOS_AfterFork_Parent(void)
{
if (_PyImport_ReleaseLock() <= 0)
Py_FatalError("failed releasing import lock after fork");
run_at_forkers(PyThreadState_Get()->interp->after_forkers_parent, 0);
}
void
PyOS_AfterFork_Child(void)
{
_PyGILState_Reinit();
PyEval_ReInitThreads();
_PyImport_ReInitLock();
_PySignal_AfterFork();
run_at_forkers(PyThreadState_Get()->interp->after_forkers_child, 0);
}
static int
register_at_forker(PyObject **lst, PyObject *func)
{
if (func == NULL) /* nothing to register? do nothing. */
return 0;
if (*lst == NULL) {
*lst = PyList_New(0);
if (*lst == NULL)
return -1;
}
return PyList_Append(*lst, func);
}
#endif
/* Legacy wrapper */
void
PyOS_AfterFork(void)
{
#ifdef HAVE_FORK
PyOS_AfterFork_Child();
#endif
}
#ifdef MS_WINDOWS
/* defined in fileutils.c */
PyAPI_FUNC(void) _Py_time_t_to_FILE_TIME(time_t, int, FILETIME *);
PyAPI_FUNC(void) _Py_attribute_data_to_stat(BY_HANDLE_FILE_INFORMATION *,
ULONG, struct _Py_stat_struct *);
#endif
#ifdef MS_WINDOWS
static int
win32_warn_bytes_api()
{
return PyErr_WarnEx(PyExc_DeprecationWarning,
"The Windows bytes API has been deprecated, "
"use Unicode filenames instead",
1);
}
#endif
#ifndef MS_WINDOWS
PyObject *
_PyLong_FromUid(uid_t uid)
{
if (uid == (uid_t)-1)
return PyLong_FromLong(-1);
return PyLong_FromUnsignedLong(uid);
}
PyObject *
_PyLong_FromGid(gid_t gid)
{
if (gid == (gid_t)-1)
return PyLong_FromLong(-1);
return PyLong_FromUnsignedLong(gid);
}
int
_Py_Uid_Converter(PyObject *obj, void *p)
{
uid_t uid;
PyObject *index;
int overflow;
long result;
unsigned long uresult;
index = PyNumber_Index(obj);
if (index == NULL) {
PyErr_Format(PyExc_TypeError,
"uid should be integer, not %.200s",
Py_TYPE(obj)->tp_name);
return 0;
}
/*
* Handling uid_t is complicated for two reasons:
* * Although uid_t is (always?) unsigned, it still
* accepts -1.
* * We don't know its size in advance--it may be
* bigger than an int, or it may be smaller than
* a long.
*
* So a bit of defensive programming is in order.
* Start with interpreting the value passed
* in as a signed long and see if it works.
*/
result = PyLong_AsLongAndOverflow(index, &overflow);
if (!overflow) {
uid = (uid_t)result;
if (result == -1) {
if (PyErr_Occurred())
goto fail;
/* It's a legitimate -1, we're done. */
goto success;
}
/* Any other negative number is disallowed. */
if (result < 0)
goto underflow;
/* Ensure the value wasn't truncated. */
if (sizeof(uid_t) < sizeof(long) &&
(long)uid != result)
goto underflow;
goto success;
}
if (overflow < 0)
goto underflow;
/*
* Okay, the value overflowed a signed long. If it
* fits in an *unsigned* long, it may still be okay,
* as uid_t may be unsigned long on this platform.
*/
uresult = PyLong_AsUnsignedLong(index);
if (PyErr_Occurred()) {
if (PyErr_ExceptionMatches(PyExc_OverflowError))
goto overflow;
goto fail;
}
uid = (uid_t)uresult;
/*
* If uid == (uid_t)-1, the user actually passed in ULONG_MAX,
* but this value would get interpreted as (uid_t)-1 by chown
* and its siblings. That's not what the user meant! So we
* throw an overflow exception instead. (We already
* handled a real -1 with PyLong_AsLongAndOverflow() above.)
*/
if (uid == (uid_t)-1)
goto overflow;
/* Ensure the value wasn't truncated. */
if (sizeof(uid_t) < sizeof(long) &&
(unsigned long)uid != uresult)
goto overflow;
/* fallthrough */
success:
Py_DECREF(index);
*(uid_t *)p = uid;
return 1;
underflow:
PyErr_SetString(PyExc_OverflowError,
"uid is less than minimum");
goto fail;
overflow:
PyErr_SetString(PyExc_OverflowError,
"uid is greater than maximum");
/* fallthrough */
fail:
Py_DECREF(index);
return 0;
}
int
_Py_Gid_Converter(PyObject *obj, void *p)
{
gid_t gid;
PyObject *index;
int overflow;
long result;
unsigned long uresult;
index = PyNumber_Index(obj);
if (index == NULL) {
PyErr_Format(PyExc_TypeError,
"gid should be integer, not %.200s",
Py_TYPE(obj)->tp_name);
return 0;
}
/*
* Handling gid_t is complicated for two reasons:
* * Although gid_t is (always?) unsigned, it still
* accepts -1.
* * We don't know its size in advance--it may be
* bigger than an int, or it may be smaller than
* a long.
*
* So a bit of defensive programming is in order.
* Start with interpreting the value passed
* in as a signed long and see if it works.
*/
result = PyLong_AsLongAndOverflow(index, &overflow);
if (!overflow) {
gid = (gid_t)result;
if (result == -1) {
if (PyErr_Occurred())
goto fail;
/* It's a legitimate -1, we're done. */
goto success;
}
/* Any other negative number is disallowed. */
if (result < 0) {
goto underflow;
}
/* Ensure the value wasn't truncated. */
if (sizeof(gid_t) < sizeof(long) &&
(long)gid != result)
goto underflow;
goto success;
}
if (overflow < 0)
goto underflow;
/*
* Okay, the value overflowed a signed long. If it
* fits in an *unsigned* long, it may still be okay,
* as gid_t may be unsigned long on this platform.
*/
uresult = PyLong_AsUnsignedLong(index);
if (PyErr_Occurred()) {
if (PyErr_ExceptionMatches(PyExc_OverflowError))
goto overflow;
goto fail;
}
gid = (gid_t)uresult;
/*
* If gid == (gid_t)-1, the user actually passed in ULONG_MAX,
* but this value would get interpreted as (gid_t)-1 by chown
* and its siblings. That's not what the user meant! So we
* throw an overflow exception instead. (We already
* handled a real -1 with PyLong_AsLongAndOverflow() above.)
*/
if (gid == (gid_t)-1)
goto overflow;
/* Ensure the value wasn't truncated. */
if (sizeof(gid_t) < sizeof(long) &&
(unsigned long)gid != uresult)
goto overflow;
/* fallthrough */
success:
Py_DECREF(index);
*(gid_t *)p = gid;
return 1;
underflow:
PyErr_SetString(PyExc_OverflowError,
"gid is less than minimum");
goto fail;
overflow:
PyErr_SetString(PyExc_OverflowError,
"gid is greater than maximum");
/* fallthrough */
fail:
Py_DECREF(index);
return 0;
}
#endif /* MS_WINDOWS */
#define _PyLong_FromDev PyLong_FromLongLong
#if defined(HAVE_MKNOD) && defined(HAVE_MAKEDEV)
static int
_Py_Dev_Converter(PyObject *obj, void *p)
{
*((dev_t *)p) = PyLong_AsUnsignedLongLong(obj);
if (PyErr_Occurred())
return 0;
return 1;
}
#endif /* HAVE_MKNOD && HAVE_MAKEDEV */
#ifdef AT_FDCWD
/*
* Why the (int) cast? Solaris 10 defines AT_FDCWD as 0xffd19553 (-3041965);
* without the int cast, the value gets interpreted as uint (4291925331),
* which doesn't play nicely with all the initializer lines in this file that
* look like this:
* int dir_fd = DEFAULT_DIR_FD;
*/
#define DEFAULT_DIR_FD (int)AT_FDCWD
#else
#define DEFAULT_DIR_FD (-100)
#endif
static int
_fd_converter(PyObject *o, int *p)
{
int overflow;
long long_value;
PyObject *index = PyNumber_Index(o);
if (index == NULL) {
return 0;
}
assert(PyLong_Check(index));
long_value = PyLong_AsLongAndOverflow(index, &overflow);
Py_DECREF(index);
assert(!PyErr_Occurred());
if (overflow > 0 || long_value > INT_MAX) {
PyErr_SetString(PyExc_OverflowError,
"fd is greater than maximum");
return 0;
}
if (overflow < 0 || long_value < INT_MIN) {
PyErr_SetString(PyExc_OverflowError,
"fd is less than minimum");
return 0;
}
*p = (int)long_value;
return 1;
}
static int
dir_fd_converter(PyObject *o, void *p)
{
if (o == Py_None) {
*(int *)p = DEFAULT_DIR_FD;
return 1;
}
else if (PyIndex_Check(o)) {
return _fd_converter(o, (int *)p);
}
else {
PyErr_Format(PyExc_TypeError,
"argument should be integer or None, not %.200s",
Py_TYPE(o)->tp_name);
return 0;
}
}
/*
* A PyArg_ParseTuple "converter" function
* that handles filesystem paths in the manner
* preferred by the os module.
*
* path_converter accepts (Unicode) strings and their
* subclasses, and bytes and their subclasses. What
* it does with the argument depends on the platform:
*
* * On Windows, if we get a (Unicode) string we
* extract the wchar_t * and return it; if we get
* bytes we decode to wchar_t * and return that.
*
* * On all other platforms, strings are encoded
* to bytes using PyUnicode_FSConverter, then we
* extract the char * from the bytes object and
* return that.
*
* path_converter also optionally accepts signed
* integers (representing open file descriptors) instead
* of path strings.
*
* Input fields:
* path.nullable
* If nonzero, the path is permitted to be None.
* path.allow_fd
* If nonzero, the path is permitted to be a file handle
* (a signed int) instead of a string.
* path.function_name
* If non-NULL, path_converter will use that as the name
* of the function in error messages.
* (If path.function_name is NULL it omits the function name.)
* path.argument_name
* If non-NULL, path_converter will use that as the name
* of the parameter in error messages.
* (If path.argument_name is NULL it uses "path".)
*
* Output fields:
* path.wide
* Points to the path if it was expressed as Unicode
* and was not encoded. (Only used on Windows.)
* path.narrow
* Points to the path if it was expressed as bytes,
* or it was Unicode and was encoded to bytes. (On Windows,
* is a non-zero integer if the path was expressed as bytes.
* The type is deliberately incompatible to prevent misuse.)
* path.fd
* Contains a file descriptor if path.accept_fd was true
* and the caller provided a signed integer instead of any
* sort of string.
*
* WARNING: if your "path" parameter is optional, and is
* unspecified, path_converter will never get called.
* So if you set allow_fd, you *MUST* initialize path.fd = -1
* yourself!
* path.length
* The length of the path in characters, if specified as
* a string.
* path.object
* The original object passed in (if get a PathLike object,
* the result of PyOS_FSPath() is treated as the original object).
* Own a reference to the object.
* path.cleanup
* For internal use only. May point to a temporary object.
* (Pay no attention to the man behind the curtain.)
*
* At most one of path.wide or path.narrow will be non-NULL.
* If path was None and path.nullable was set,
* or if path was an integer and path.allow_fd was set,
* both path.wide and path.narrow will be NULL
* and path.length will be 0.
*
* path_converter takes care to not write to the path_t
* unless it's successful. However it must reset the
* "cleanup" field each time it's called.
*
* Use as follows:
* path_t path;
* memset(&path, 0, sizeof(path));
* PyArg_ParseTuple(args, "O&", path_converter, &path);
* // ... use values from path ...
* path_cleanup(&path);
*
* (Note that if PyArg_Parse fails you don't need to call
* path_cleanup(). However it is safe to do so.)
*/
typedef struct {
const char *function_name;
const char *argument_name;
int nullable;
int allow_fd;
const wchar_t *wide;
#ifdef MS_WINDOWS
BOOL narrow;
#else
const char *narrow;
#endif
int fd;
Py_ssize_t length;
PyObject *object;
PyObject *cleanup;
} path_t;
#ifdef MS_WINDOWS
#define PATH_T_INITIALIZE(function_name, argument_name, nullable, allow_fd) \
{function_name, argument_name, nullable, allow_fd, NULL, FALSE, -1, 0, NULL, NULL}
#else
#define PATH_T_INITIALIZE(function_name, argument_name, nullable, allow_fd) \
{function_name, argument_name, nullable, allow_fd, NULL, NULL, -1, 0, NULL, NULL}
#endif
static void
path_cleanup(path_t *path)
{
Py_CLEAR(path->object);
Py_CLEAR(path->cleanup);
}
static int
path_converter(PyObject *o, void *p)
{
path_t *path = (path_t *)p;
PyObject *bytes = NULL;
Py_ssize_t length = 0;
int is_index, is_buffer, is_bytes, is_unicode;
const char *narrow;
#ifdef MS_WINDOWS
PyObject *wo = NULL;
const wchar_t *wide;
#endif
#define FORMAT_EXCEPTION(exc, fmt) \
PyErr_Format(exc, "%s%s" fmt, \
path->function_name ? path->function_name : "", \
path->function_name ? ": " : "", \
path->argument_name ? path->argument_name : "path")
/* Py_CLEANUP_SUPPORTED support */
if (o == NULL) {
path_cleanup(path);
return 1;
}
/* Ensure it's always safe to call path_cleanup(). */
path->object = path->cleanup = NULL;
/* path->object owns a reference to the original object */
Py_INCREF(o);
if ((o == Py_None) && path->nullable) {
path->wide = NULL;
#ifdef MS_WINDOWS
path->narrow = FALSE;
#else
path->narrow = NULL;
#endif
path->fd = -1;
goto success_exit;
}
/* Only call this here so that we don't treat the return value of
os.fspath() as an fd or buffer. */
is_index = path->allow_fd && PyIndex_Check(o);
is_buffer = PyObject_CheckBuffer(o);
is_bytes = PyBytes_Check(o);
is_unicode = PyUnicode_Check(o);
if (!is_index && !is_buffer && !is_unicode && !is_bytes) {
/* Inline PyOS_FSPath() for better error messages. */
_Py_IDENTIFIER(__fspath__);
PyObject *func = NULL;
func = _PyObject_LookupSpecial(o, &PyId___fspath__);
if (NULL == func) {
goto error_format;
}
/* still owns a reference to the original object */
Py_DECREF(o);
o = _PyObject_CallNoArg(func);
Py_DECREF(func);
if (NULL == o) {
goto error_exit;
}