-
Notifications
You must be signed in to change notification settings - Fork 2.9k
/
unix_efile.c
1518 lines (1378 loc) · 39.2 KB
/
unix_efile.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
/*
* %CopyrightBegin%
*
* Copyright Ericsson AB 1997-2012. All Rights Reserved.
*
* The contents of this file are subject to the Erlang Public License,
* Version 1.1, (the "License"); you may not use this file except in
* compliance with the License. You should have received a copy of the
* Erlang Public License along with this software. If not, it can be
* retrieved online at http://www.erlang.org/.
*
* Software distributed under the License is distributed on an "AS IS"
* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
* the License for the specific language governing rights and limitations
* under the License.
*
* %CopyrightEnd%
*/
/*
* Purpose: Provides file and directory operations for Unix.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include "sys.h"
#include "erl_driver.h"
#include "erl_efile.h"
#include <utime.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_SYS_UIO_H
#include <sys/types.h>
#include <sys/uio.h>
#endif
#if defined(HAVE_SENDFILE) && (defined(__linux__) || (defined(__sun) && defined(__SVR4)))
#include <sys/sendfile.h>
#endif
#if defined(__APPLE__) && defined(__MACH__) && !defined(__DARWIN__)
#define DARWIN 1
#endif
#ifdef DARWIN
#include <fcntl.h>
#endif /* DARWIN */
#ifdef VXWORKS
#include <ioLib.h>
#include <dosFsLib.h>
#include <nfsLib.h>
#include <sys/stat.h>
/*
** Not nice to include usrLib.h as MANY normal variable names get reported
** as shadowing globals, like 'i' for example.
** Instead we declare the only function we use here
*/
/*
* #include <usrLib.h>
*/
extern STATUS copy(char *, char *);
#include <errno.h>
#endif
#ifdef SUNOS4
# define getcwd(buf, size) getwd(buf)
#endif
/* Find a definition of MAXIOV, that is used in the code later. */
#if defined IOV_MAX
#define MAXIOV IOV_MAX
#elif defined UIO_MAXIOV
#define MAXIOV UIO_MAXIOV
#else
#define MAXIOV 16
#endif
/*
* Macros for testing file types.
*/
#define ISDIR(st) (((st).st_mode & S_IFMT) == S_IFDIR)
#define ISREG(st) (((st).st_mode & S_IFMT) == S_IFREG)
#define ISDEV(st) \
(((st).st_mode&S_IFMT) == S_IFCHR || ((st).st_mode&S_IFMT) == S_IFBLK)
#define ISLNK(st) (((st).st_mode & S_IFLNK) == S_IFLNK)
#ifdef NO_UMASK
#define FILE_MODE 0644
#define DIR_MODE 0755
#else
#define FILE_MODE 0666
#define DIR_MODE 0777
#endif
#ifdef VXWORKS /* Currently only used on vxworks */
#define EF_ALLOC(S) driver_alloc((S))
#define EF_REALLOC(P, S) driver_realloc((P), (S))
#define EF_SAFE_ALLOC(S) ef_safe_alloc((S))
#define EF_SAFE_REALLOC(P, S) ef_safe_realloc((P), (S))
#define EF_FREE(P) do { if((P)) driver_free((P)); } while(0)
void erl_exit(int n, char *fmt, ...);
static void *ef_safe_alloc(Uint s)
{
void *p = EF_ALLOC(s);
if (!p) erl_exit(1,
"unix efile drv: Can't allocate %lu bytes of memory\n",
(unsigned long)s);
return p;
}
#if 0 /* Currently not used */
static void *ef_safe_realloc(void *op, Uint s)
{
void *p = EF_REALLOC(op, s);
if (!p) erl_exit(1,
"unix efile drv: Can't reallocate %lu bytes of memory\n",
(unsigned long)s);
return p;
}
#endif /* #if 0 */
#endif /* #ifdef VXWORKS */
#define IS_DOT_OR_DOTDOT(s) \
(s[0] == '.' && (s[1] == '\0' || (s[1] == '.' && s[2] == '\0')))
#ifdef VXWORKS
static int vxworks_to_posix(int vx_errno);
#endif
/*
** VxWorks (not) strikes again. Too long RESULTING paths
** may give the infamous bus error. Have to check ALL
** filenames and pathnames. No wonder the emulator is slow on
** these cards...
*/
#ifdef VXWORKS
#define CHECK_PATHLEN(Name, ErrInfo) \
if (path_size(Name) > PATH_MAX) { \
errno = ENAMETOOLONG; \
return check_error(-1, ErrInfo); \
}
#else
#define CHECK_PATHLEN(X,Y) /* Nothing */
#endif
static int check_error(int result, Efile_error* errInfo);
static int
check_error(int result, Efile_error *errInfo)
{
if (result < 0) {
#ifdef VXWORKS
errInfo->posix_errno = errInfo->os_errno = vxworks_to_posix(errno);
#else
errInfo->posix_errno = errInfo->os_errno = errno;
#endif
return 0;
}
return 1;
}
#ifdef VXWORKS
/*
* VxWorks has different error codes for different file systems.
* We map those to POSIX ones.
*/
static int
vxworks_to_posix(int vx_errno)
{
DEBUGF(("[vxworks_to_posix] vx_errno: %08x\n", vx_errno));
switch (vx_errno) {
/* dosFsLib mapping */
#ifdef S_dosFsLib_FILE_ALREADY_EXISTS
case S_dosFsLib_FILE_ALREADY_EXISTS: return EEXIST;
#else
case S_dosFsLib_FILE_EXISTS: return EEXIST;
#endif
#ifdef S_dosFsLib_BAD_DISK
case S_dosFsLib_BAD_DISK: return EIO;
#endif
#ifdef S_dosFsLib_CANT_CHANGE_ROOT
case S_dosFsLib_CANT_CHANGE_ROOT: return EINVAL;
#endif
#ifdef S_dosFsLib_NO_BLOCK_DEVICE
case S_dosFsLib_NO_BLOCK_DEVICE: return ENOTBLK;
#endif
#ifdef S_dosFsLib_BAD_SEEK
case S_dosFsLib_BAD_SEEK: return ESPIPE;
#endif
case S_dosFsLib_VOLUME_NOT_AVAILABLE: return ENXIO;
case S_dosFsLib_DISK_FULL: return ENOSPC;
case S_dosFsLib_FILE_NOT_FOUND: return ENOENT;
case S_dosFsLib_NO_FREE_FILE_DESCRIPTORS: return ENFILE;
case S_dosFsLib_INVALID_NUMBER_OF_BYTES: return EINVAL;
case S_dosFsLib_ILLEGAL_NAME: return EINVAL;
case S_dosFsLib_CANT_DEL_ROOT: return EACCES;
case S_dosFsLib_NOT_FILE: return EISDIR;
case S_dosFsLib_NOT_DIRECTORY: return ENOTDIR;
case S_dosFsLib_NOT_SAME_VOLUME: return EXDEV;
case S_dosFsLib_READ_ONLY: return EACCES;
case S_dosFsLib_ROOT_DIR_FULL: return ENOSPC;
case S_dosFsLib_DIR_NOT_EMPTY: return EEXIST;
case S_dosFsLib_NO_LABEL: return ENXIO;
case S_dosFsLib_INVALID_PARAMETER: return EINVAL;
case S_dosFsLib_NO_CONTIG_SPACE: return ENOSPC;
case S_dosFsLib_FD_OBSOLETE: return EBADF;
case S_dosFsLib_DELETED: return EINVAL;
case S_dosFsLib_INTERNAL_ERROR: return EIO;
case S_dosFsLib_WRITE_ONLY: return EACCES;
/* nfsLib mapping - is needed since Windriver has used */
/* inconsistent error codes (errno.h/nfsLib.h). */
case S_nfsLib_NFS_OK: return 0;
case S_nfsLib_NFSERR_PERM: return EPERM;
case S_nfsLib_NFSERR_NOENT: return ENOENT;
case S_nfsLib_NFSERR_IO: return EIO;
case S_nfsLib_NFSERR_NXIO: return ENXIO;
#ifdef S_nfsLib_NFSERR_ACCES
case S_nfsLib_NFSERR_ACCES: return EACCES;
#else
case S_nfsLib_NFSERR_ACCESS: return EACCES;
#endif
case S_nfsLib_NFSERR_EXIST: return EEXIST;
case S_nfsLib_NFSERR_NODEV: return ENODEV;
case S_nfsLib_NFSERR_NOTDIR: return ENOTDIR;
case S_nfsLib_NFSERR_ISDIR: return EISDIR;
case S_nfsLib_NFSERR_FBIG: return EFBIG;
case S_nfsLib_NFSERR_NOSPC: return ENOSPC;
case S_nfsLib_NFSERR_ROFS: return EROFS;
case S_nfsLib_NFSERR_NAMETOOLONG: return ENAMETOOLONG;
case S_nfsLib_NFSERR_NOTEMPTY: return EEXIST;
case S_nfsLib_NFSERR_DQUOT: return ENOSPC;
case S_nfsLib_NFSERR_STALE: return EINVAL;
case S_nfsLib_NFSERR_WFLUSH: return ENXIO;
/* And sometimes (...) the error codes are from ioLib (as in the */
/* case of the (for nfsLib) unimplemented rename function) */
case S_ioLib_DISK_NOT_PRESENT: return EIO;
#if S_ioLib_DISK_NOT_PRESENT != S_ioLib_NO_DRIVER
case S_ioLib_NO_DRIVER: return ENXIO;
#endif
case S_ioLib_UNKNOWN_REQUEST: return ENOSYS;
case S_ioLib_DEVICE_TIMEOUT: return EIO;
#ifdef S_ioLib_UNFORMATED
/* Added (VxWorks 5.2 -> 5.3.1) */
#if S_ioLib_UNFORMATED != S_ioLib_DEVICE_TIMEOUT
case S_ioLib_UNFORMATED: return EIO;
#endif
#endif
#if S_ioLib_DEVICE_TIMEOUT != S_ioLib_DEVICE_ERROR
case S_ioLib_DEVICE_ERROR: return ENXIO;
#endif
case S_ioLib_WRITE_PROTECTED: return EACCES;
case S_ioLib_NO_FILENAME: return EINVAL;
case S_ioLib_CANCELLED: return EINTR;
case S_ioLib_NO_DEVICE_NAME_IN_PATH: return EINVAL;
case S_ioLib_NAME_TOO_LONG: return ENAMETOOLONG;
#ifdef S_objLib_OBJ_UNAVAILABLE
case S_objLib_OBJ_UNAVAILABLE: return ENOENT;
#endif
/* Temporary workaround for a weird error in passFs
(VxWorks Simsparc only). File operation fails because of
ENOENT, but errno is not set. */
#ifdef SIMSPARCSOLARIS
case 0: return ENOENT;
#endif
}
/* If the error code matches none of the above, assume */
/* it is a POSIX one already. The upper bits (>=16) are */
/* cleared since VxWorks uses those bits to indicate in */
/* what module the error occured. */
return vx_errno & 0xffff;
}
static int
vxworks_enotsup(Efile_error *errInfo)
{
errInfo->posix_errno = errInfo->os_errno = ENOTSUP;
return 0;
}
static int
count_path_length(char *pathname, char *pathname2)
{
static int stack[PATH_MAX / 2 + 1];
int sp = 0;
char *tmp;
char *cpy = NULL;
int i;
int sum;
for(i = 0;i < 2;++i) {
if (!i) {
cpy = EF_SAFE_ALLOC(strlen(pathname)+1);
strcpy(cpy, pathname);
} else if (pathname2 != NULL) {
EF_FREE(cpy);
cpy = EF_SAFE_ALLOC(strlen(pathname2)+1);
strcpy(cpy, pathname2);
} else
break;
for (tmp = strtok(cpy,"/"); tmp != NULL; tmp = strtok(NULL,"/")) {
if (!strcmp(tmp,"..") && sp > 0)
--sp;
else if (strcmp(tmp,"."))
stack[sp++] = strlen(tmp);
}
}
if (cpy != NULL)
EF_FREE(cpy);
sum = 0;
for(i = 0;i < sp; ++i)
sum += stack[i]+1;
return (sum) ? sum : 1;
}
static int
path_size(char *pathname)
{
static char currdir[PATH_MAX+2];
if (*pathname == '/')
return count_path_length(pathname,NULL);
ioDefPathGet(currdir);
strcat(currdir,"/");
return count_path_length(currdir,pathname);
}
#endif /* VXWORKS */
int
efile_mkdir(Efile_error* errInfo, /* Where to return error codes. */
char* name) /* Name of directory to create. */
{
CHECK_PATHLEN(name,errInfo);
#ifdef NO_MKDIR_MODE
#ifdef VXWORKS
/* This is a VxWorks/nfs workaround for erl_tar to create
* non-existant directories. (of some reason (...) VxWorks
* returns, the *non-module-prefixed*, 0xd code when
* trying to create a directory in a directory that doesn't exist).
* (see efile_openfile)
*/
if (mkdir(name) < 0) {
struct stat sb;
if (name[0] == '\0') {
/* Return the correct error code enoent */
errno = S_nfsLib_NFSERR_NOENT;
} else if (stat(name, &sb) == OK) {
errno = S_nfsLib_NFSERR_EXIST;
} else if((strchr(name, '/') != NULL) && (errno == 0xd)) {
/* Return the correct error code enoent */
errno = S_nfsLib_NFSERR_NOENT;
}
return check_error(-1, errInfo);
} else return 1;
#else
return check_error(mkdir(name), errInfo);
#endif
#else
return check_error(mkdir(name, DIR_MODE), errInfo);
#endif
}
int
efile_rmdir(Efile_error* errInfo, /* Where to return error codes. */
char* name) /* Name of directory to delete. */
{
CHECK_PATHLEN(name, errInfo);
if (rmdir(name) == 0) {
return 1;
}
#ifdef VXWORKS
if (name[0] == '\0') {
/* Return the correct error code enoent */
errno = S_nfsLib_NFSERR_NOENT;
}
#else
if (errno == ENOTEMPTY) {
errno = EEXIST;
}
if (errno == EEXIST) {
int saved_errno = errno;
struct stat file_stat;
struct stat cwd_stat;
/*
* The error code might be wrong if this is the current directory.
*/
if (stat(name, &file_stat) == 0 && stat(".", &cwd_stat) == 0 &&
file_stat.st_ino == cwd_stat.st_ino &&
file_stat.st_dev == cwd_stat.st_dev) {
saved_errno = EINVAL;
}
errno = saved_errno;
}
#endif
return check_error(-1, errInfo);
}
int
efile_delete_file(Efile_error* errInfo, /* Where to return error codes. */
char* name) /* Name of file to delete. */
{
CHECK_PATHLEN(name,errInfo);
if (unlink(name) == 0) {
return 1;
}
if (errno == EISDIR) { /* Linux sets the wrong error code. */
errno = EPERM;
}
return check_error(-1, errInfo);
}
/*
*---------------------------------------------------------------------------
*
* Changes the name of an existing file or directory, from src to dst.
* If src and dst refer to the same file or directory, does nothing
* and returns success. Otherwise if dst already exists, it will be
* deleted and replaced by src subject to the following conditions:
* If src is a directory, dst may be an empty directory.
* If src is a file, dst may be a file.
* In any other situation where dst already exists, the rename will
* fail.
*
* Results:
* If the directory was successfully created, returns 1.
* Otherwise the return value is 0 and errno is set to
* indicate the error. Some possible values for errno are:
*
* EACCES: src or dst parent directory can't be read and/or written.
* EEXIST: dst is a non-empty directory.
* EINVAL: src is a root directory or dst is a subdirectory of src.
* EISDIR: dst is a directory, but src is not.
* ENOENT: src doesn't exist, or src or dst is "".
* ENOTDIR: src is a directory, but dst is not.
* EXDEV: src and dst are on different filesystems.
*
* Side effects:
* The implementation of rename may allow cross-filesystem renames,
* but the caller should be prepared to emulate it with copy and
* delete if errno is EXDEV.
*
*---------------------------------------------------------------------------
*/
int
efile_rename(Efile_error* errInfo, /* Where to return error codes. */
char* src, /* Original name. */
char* dst) /* New name. */
{
CHECK_PATHLEN(src,errInfo);
CHECK_PATHLEN(dst,errInfo);
#ifdef VXWORKS
/* First check if src == dst, if so, just return. */
/* VxWorks dos file system destroys the file otherwise, */
/* VxWorks nfs file system rename doesn't work at all. */
if(strcmp(src, dst) == 0)
return 1;
#endif
if (rename(src, dst) == 0) {
return 1;
}
#ifdef VXWORKS
/* nfs for VxWorks doesn't support rename. We try to emulate it */
/* (by first copying src to dst and then deleting src). */
if(errno == S_ioLib_UNKNOWN_REQUEST && /* error code returned
by ioLib (!) */
copy(src, dst) == OK &&
unlink(src) == OK)
return 1;
#endif
if (errno == ENOTEMPTY) {
errno = EEXIST;
}
#if defined (sparc) && !defined(VXWORKS)
/*
* SunOS 4.1.4 reports overwriting a non-empty directory with a
* directory as EINVAL instead of EEXIST (first rule out the correct
* EINVAL result code for moving a directory into itself). Must be
* conditionally compiled because realpath() is only defined on SunOS.
*/
if (errno == EINVAL) {
char srcPath[MAXPATHLEN], dstPath[MAXPATHLEN];
DIR *dirPtr;
struct dirent *dirEntPtr;
#ifdef PURIFY
memset(srcPath, '\0', sizeof(srcPath));
memset(dstPath, '\0', sizeof(dstPath));
#endif
if ((realpath(src, srcPath) != NULL)
&& (realpath(dst, dstPath) != NULL)
&& (strncmp(srcPath, dstPath, strlen(srcPath)) != 0)) {
dirPtr = opendir(dst);
if (dirPtr != NULL) {
while ((dirEntPtr = readdir(dirPtr)) != NULL) {
if ((strcmp(dirEntPtr->d_name, ".") != 0) &&
(strcmp(dirEntPtr->d_name, "..") != 0)) {
errno = EEXIST;
closedir(dirPtr);
return check_error(-1, errInfo);
}
}
closedir(dirPtr);
}
}
errno = EINVAL;
}
#endif /* sparc */
if (strcmp(src, "/") == 0) {
/*
* Alpha reports renaming / as EBUSY and Linux reports it as EACCES,
* instead of EINVAL.
*/
errno = EINVAL;
}
/*
* DEC Alpha OSF1 V3.0 returns EACCES when attempting to move a
* file across filesystems and the parent directory of that file is
* not writable. Most other systems return EXDEV. Does nothing to
* correct this behavior.
*/
return check_error(-1, errInfo);
}
int
efile_chdir(Efile_error* errInfo, /* Where to return error codes. */
char* name) /* Name of directory to make current. */
{
CHECK_PATHLEN(name, errInfo);
return check_error(chdir(name), errInfo);
}
int
efile_getdcwd(Efile_error* errInfo, /* Where to return error codes. */
int drive, /* 0 - current, 1 - A, 2 - B etc. */
char* buffer, /* Where to return the current
directory. */
size_t size) /* Size of buffer. */
{
if (drive == 0) {
if (getcwd(buffer, size) == NULL)
return check_error(-1, errInfo);
#ifdef SIMSPARCSOLARIS
/* We get "host:" prepended to the dirname - remove!. */
{
int i = 0;
int j = 0;
while ((buffer[i] != ':') && (buffer[i] != '\0')) i++;
if (buffer[i] == ':') {
i++;
while ((buffer[j++] = buffer[i++]) != '\0');
}
}
#endif
return 1;
}
/*
* Drives other than 0 is not supported on Unix.
*/
errno = ENOTSUP;
return check_error(-1, errInfo);
}
int
efile_readdir(Efile_error* errInfo, /* Where to return error codes. */
char* name, /* Name of directory to open. */
EFILE_DIR_HANDLE* p_dir_handle, /* Pointer to directory
handle of
open directory.*/
char* buffer, /* Pointer to buffer for
one filename. */
size_t *size) /* in-out Size of buffer, length
of name. */
{
DIR *dp; /* Pointer to directory structure. */
struct dirent* dirp; /* Pointer to directory entry. */
/*
* If this is the first call, we must open the directory.
*/
CHECK_PATHLEN(name, errInfo);
if (*p_dir_handle == NULL) {
dp = opendir(name);
if (dp == NULL)
return check_error(-1, errInfo);
*p_dir_handle = (EFILE_DIR_HANDLE) dp;
}
/*
* Retrieve the name of the next file using the directory handle.
*/
dp = *((DIR **)((void *)p_dir_handle));
for (;;) {
dirp = readdir(dp);
if (dirp == NULL) {
closedir(dp);
return 0;
}
if (IS_DOT_OR_DOTDOT(dirp->d_name))
continue;
buffer[0] = '\0';
strncat(buffer, dirp->d_name, (*size)-1);
*size = strlen(dirp->d_name);
return 1;
}
}
int
efile_openfile(Efile_error* errInfo, /* Where to return error codes. */
char* name, /* Name of directory to open. */
int flags, /* Flags to user for opening. */
int* pfd, /* Where to store the file
descriptor. */
Sint64 *pSize) /* Where to store the size of the
file. */
{
struct stat statbuf;
int fd;
int mode; /* Open mode. */
#ifdef VXWORKS
char pathbuff[PATH_MAX+2];
char sbuff[PATH_MAX*2];
char *totbuff = sbuff;
int nameneed;
#endif
CHECK_PATHLEN(name, errInfo);
#ifdef VXWORKS
/* Have to check that it's not a directory. */
if (stat(name,&statbuf) != ERROR && ISDIR(statbuf)) {
errno = EISDIR;
return check_error(-1, errInfo);
}
#endif
if (stat(name, &statbuf) >= 0 && !ISREG(statbuf)) {
#if !defined(VXWORKS) && !defined(OSE)
/*
* For UNIX only, here is some ugly code to allow
* /dev/null to be opened as a file.
*
* Assumption: The i-node number for /dev/null cannot be zero.
*/
static ino_t dev_null_ino = 0;
if (dev_null_ino == 0) {
struct stat nullstatbuf;
if (stat("/dev/null", &nullstatbuf) >= 0) {
dev_null_ino = nullstatbuf.st_ino;
}
}
if (!(dev_null_ino && statbuf.st_ino == dev_null_ino)) {
#endif
errno = EISDIR;
return check_error(-1, errInfo);
#if !defined(VXWORKS) && !defined(OSE)
}
#endif
}
switch (flags & (EFILE_MODE_READ|EFILE_MODE_WRITE)) {
case EFILE_MODE_READ:
mode = O_RDONLY;
break;
case EFILE_MODE_WRITE:
if (flags & EFILE_NO_TRUNCATE)
mode = O_WRONLY | O_CREAT;
else
mode = O_WRONLY | O_CREAT | O_TRUNC;
break;
case EFILE_MODE_READ_WRITE:
mode = O_RDWR | O_CREAT;
break;
default:
errno = EINVAL;
return check_error(-1, errInfo);
}
if (flags & EFILE_MODE_APPEND) {
mode &= ~O_TRUNC;
#ifndef VXWORKS
mode |= O_APPEND; /* Dont make VxWorks think things it shouldn't */
#endif
}
if (flags & EFILE_MODE_EXCL) {
mode |= O_EXCL;
}
#ifdef VXWORKS
if (*name != '/') {
/* Make sure it is an absolute pathname, because ftruncate needs it */
ioDefPathGet(pathbuff);
strcat(pathbuff,"/");
nameneed = strlen(pathbuff) + strlen(name) + 1;
if (nameneed > PATH_MAX*2)
totbuff = EF_SAFE_ALLOC(nameneed);
strcpy(totbuff,pathbuff);
strcat(totbuff,name);
fd = open(totbuff, mode, FILE_MODE);
if (totbuff != sbuff)
EF_FREE(totbuff);
} else {
fd = open(name, mode, FILE_MODE);
}
#else
fd = open(name, mode, FILE_MODE);
#endif
#ifdef VXWORKS
/* This is a VxWorks/nfs workaround for erl_tar to create
* non-existant directories. (of some reason (...) VxWorks
* returns, the *non-module-prefixed*, 0xd code when
* trying to write a file in a directory that doesn't exist).
* (see efile_mkdir)
*/
if ((fd < 0) && (strchr(name, '/') != NULL) && (errno == 0xd)) {
/* Return the correct error code enoent */
errno = S_nfsLib_NFSERR_NOENT;
return check_error(-1, errInfo);
}
#endif
if (!check_error(fd, errInfo))
return 0;
*pfd = fd;
if (pSize) {
*pSize = statbuf.st_size;
}
return 1;
}
int
efile_may_openfile(Efile_error* errInfo, char *name) {
struct stat statbuf; /* Information about the file */
int result;
result = stat(name, &statbuf);
if (!check_error(result, errInfo))
return 0;
if (!ISREG(statbuf)) {
errno = EISDIR;
return check_error(-1, errInfo);
}
return 1;
}
void
efile_closefile(int fd)
{
close(fd);
}
int
efile_fdatasync(Efile_error *errInfo, /* Where to return error codes. */
int fd) /* File descriptor for file to sync data. */
{
#ifdef HAVE_FDATASYNC
return check_error(fdatasync(fd), errInfo);
#else
return efile_fsync(errInfo, fd);
#endif
}
int
efile_fsync(Efile_error *errInfo, /* Where to return error codes. */
int fd) /* File descriptor for file to sync. */
{
#ifdef NO_FSYNC
#ifdef VXWORKS
return check_error(ioctl(fd, FIOSYNC, 0), errInfo);
#else
undefined fsync
#endif /* VXWORKS */
#else
#if defined(DARWIN) && defined(F_FULLFSYNC)
return check_error(fcntl(fd, F_FULLFSYNC), errInfo);
#else
return check_error(fsync(fd), errInfo);
#endif /* DARWIN */
#endif /* NO_FSYNC */
}
int
efile_fileinfo(Efile_error* errInfo, Efile_info* pInfo,
char* name, int info_for_link)
{
struct stat statbuf; /* Information about the file */
int result;
#ifdef VXWORKS
if (*name == '\0') {
errInfo->posix_errno = errInfo->os_errno = ENOENT;
return 0;
}
#endif
CHECK_PATHLEN(name, errInfo);
if (info_for_link) {
#if (defined(VXWORKS))
result = stat(name, &statbuf);
#else
result = lstat(name, &statbuf);
#endif
} else {
result = stat(name, &statbuf);
}
if (!check_error(result, errInfo)) {
return 0;
}
#if SIZEOF_OFF_T == 4
pInfo->size_high = 0;
#else
pInfo->size_high = (Uint32)(statbuf.st_size >> 32);
#endif
pInfo->size_low = (Uint32)statbuf.st_size;
#ifdef NO_ACCESS
/* Just look at read/write access for owner. */
#ifdef VXWORKS
pInfo->access = FA_NONE;
if(statbuf.st_mode & S_IRUSR)
pInfo->access |= FA_READ;
if(statbuf.st_mode & S_IWUSR)
pInfo->access |= FA_WRITE;
#else
pInfo->access = ((statbuf.st_mode >> 6) & 07) >> 1;
#endif /* VXWORKS */
#else
pInfo->access = FA_NONE;
if (access(name, R_OK) == 0)
pInfo->access |= FA_READ;
if (access(name, W_OK) == 0)
pInfo->access |= FA_WRITE;
#endif
if (ISDEV(statbuf))
pInfo->type = FT_DEVICE;
else if (ISDIR(statbuf))
pInfo->type = FT_DIRECTORY;
else if (ISREG(statbuf))
pInfo->type = FT_REGULAR;
else if (ISLNK(statbuf))
pInfo->type = FT_SYMLINK;
else
pInfo->type = FT_OTHER;
pInfo->accessTime = statbuf.st_atime;
pInfo->modifyTime = statbuf.st_mtime;
pInfo->cTime = statbuf.st_ctime;
pInfo->mode = statbuf.st_mode;
pInfo->links = statbuf.st_nlink;
pInfo->major_device = statbuf.st_dev;
pInfo->minor_device = statbuf.st_rdev;
pInfo->inode = statbuf.st_ino;
pInfo->uid = statbuf.st_uid;
pInfo->gid = statbuf.st_gid;
return 1;
}
int
efile_write_info(Efile_error *errInfo, Efile_info *pInfo, char *name)
{
struct utimbuf tval;
CHECK_PATHLEN(name, errInfo);
#ifdef VXWORKS
if (pInfo->mode != -1) {
int fd;
struct stat statbuf;
fd = open(name, O_RDONLY, 0);
if (!check_error(fd, errInfo))
return 0;
if (fstat(fd, &statbuf) < 0) {
close(fd);
return check_error(-1, errInfo);
}
if (pInfo->mode & S_IWUSR) {
/* clear read only bit */
statbuf.st_attrib &= ~DOS_ATTR_RDONLY;
} else {
/* set read only bit */
statbuf.st_attrib |= DOS_ATTR_RDONLY;
}
/* This should work for dos files but not for nfs ditos, so don't
* report errors (to avoid problems when running e.g. erl_tar)
*/
ioctl(fd, FIOATTRIBSET, statbuf.st_attrib);
close(fd);
}
#else
/*
* On some systems chown will always fail for a non-root user unless
* POSIX_CHOWN_RESTRICTED is not set. Others will succeed as long as
* you don't try to chown a file to someone besides youself.
*/
if (chown(name, pInfo->uid, pInfo->gid) && errno != EPERM) {
return check_error(-1, errInfo);
}
if (pInfo->mode != -1) {
mode_t newMode = pInfo->mode & (S_ISUID | S_ISGID |
S_IRWXU | S_IRWXG | S_IRWXO);
if (chmod(name, newMode)) {
newMode &= ~(S_ISUID | S_ISGID);
if (chmod(name, newMode)) {
return check_error(-1, errInfo);
}
}
}
#endif /* !VXWORKS */
tval.actime = pInfo->accessTime;
tval.modtime = pInfo->modifyTime;
#ifdef VXWORKS
/* VxWorks' utime doesn't work when the file is a nfs mounted
* one, don't report error if utime fails.
*/
utime(name, &tval);
return 1;
#else
return check_error(utime(name, &tval), errInfo);
#endif
}
int
efile_write(Efile_error* errInfo, /* Where to return error codes. */
int flags, /* Flags given when file was
opened. */
int fd, /* File descriptor to write to. */
char* buf, /* Buffer to write. */
size_t count) /* Number of bytes to write. */
{
ssize_t written; /* Bytes written in last operation. */
#ifdef VXWORKS
if (flags & EFILE_MODE_APPEND) {
lseek(fd, 0, SEEK_END); /* Naive append emulation on VXWORKS */
}
#endif
while (count > 0) {
if ((written = write(fd, buf, count)) < 0) {
if (errno != EINTR)
return check_error(-1, errInfo);
else
written = 0;
}
ASSERT(written <= count);
buf += written;
count -= written;
}
return 1;
}