1 /* File tree walker functions.
2 Copyright (C) 1996-2021 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
18
19 #ifdef HAVE_CONFIG_H
20 # include <config.h>
21 #endif
22
23 #if __GNUC__
24 # define alloca __builtin_alloca
25 #else
26 # if HAVE_ALLOCA_H
27 # include <alloca.h>
28 # else
29 # ifdef _AIX
30 # pragma alloca
31 # else
32 char *alloca ();
33 # endif
34 # endif
35 #endif
36
37 #ifdef _LIBC
38 # include <dirent.h>
39 # define NAMLEN(dirent) _D_EXACT_NAMLEN (dirent)
40 #else
41 # if HAVE_DIRENT_H
42 # include <dirent.h>
43 # define NAMLEN(dirent) strlen ((dirent)->d_name)
44 # else
45 # define dirent direct
46 # define NAMLEN(dirent) (dirent)->d_namlen
47 # if HAVE_SYS_NDIR_H
48 # include <sys/ndir.h>
49 # endif
50 # if HAVE_SYS_DIR_H
51 # include <sys/dir.h>
52 # endif
53 # if HAVE_NDIR_H
54 # include <ndir.h>
55 # endif
56 # endif
57 #endif
58
59 #include <errno.h>
60 #include <fcntl.h>
61 #include <ftw.h>
62 #include <limits.h>
63 #include <search.h>
64 #include <stdlib.h>
65 #include <string.h>
66 #include <unistd.h>
67 #include <not-cancel.h>
68 #include <sys/param.h>
69 #ifdef _LIBC
70 # include <include/sys/stat.h>
71 #else
72 # include <sys/stat.h>
73 #endif
74
75 #if ! _LIBC && !HAVE_DECL_STPCPY && !defined stpcpy
76 char *stpcpy ();
77 #endif
78
79 #if ! _LIBC && ! defined HAVE_MEMPCPY && ! defined mempcpy
80 /* Be CAREFUL that there are no side effects in N. */
81 # define mempcpy(D, S, N) ((void *) ((char *) memcpy (D, S, N) + (N)))
82 #endif
83
84 /* #define NDEBUG 1 */
85 #include <assert.h>
86
87 #ifndef _LIBC
88 # undef __chdir
89 # define __chdir chdir
90 # undef __closedir
91 # define __closedir closedir
92 # undef __fchdir
93 # define __fchdir fchdir
94 # undef __getcwd
95 # define __getcwd(P, N) xgetcwd ()
96 extern char *xgetcwd (void);
97 # undef __mempcpy
98 # define __mempcpy mempcpy
99 # undef __opendir
100 # define __opendir opendir
101 # undef __readdir64
102 # define __readdir64 readdir
103 # undef __stpcpy
104 # define __stpcpy stpcpy
105 # undef __tdestroy
106 # define __tdestroy tdestroy
107 # undef __tfind
108 # define __tfind tfind
109 # undef __tsearch
110 # define __tsearch tsearch
111 # undef dirent64
112 # define dirent64 dirent
113 # undef MAX
114 # define MAX(a, b) ((a) > (b) ? (a) : (b))
115 #endif
116
117 /* Arrange to make lstat calls go through the wrapper function
118 on systems with an lstat function that does not dereference symlinks
119 that are specified with a trailing slash. */
120 #if ! _LIBC && ! LSTAT_FOLLOWS_SLASHED_SYMLINK
121 int rpl_lstat (const char *, struct stat *);
122 # undef lstat
123 # define lstat(Name, Stat_buf) rpl_lstat(Name, Stat_buf)
124 #endif
125
126 #ifndef __set_errno
127 # define __set_errno(Val) errno = (Val)
128 #endif
129
130 /* Support for the LFS API version. */
131 #ifndef FTW_NAME
132 # define FTW_NAME ftw
133 # define NFTW_NAME nftw
134 # define NFTW_OLD_NAME __old_nftw
135 # define NFTW_NEW_NAME __new_nftw
136 # define INO_T ino_t
137 # define STRUCT_STAT stat
138 # ifdef _LIBC
139 # define LSTAT __lstat
140 # define STAT __stat
141 # define FSTATAT __fstatat
142 # else
143 # define LSTAT lstat
144 # define XTAT stat
145 # define FSTATAT fstatat
146 # endif
147 # define FTW_FUNC_T __ftw_func_t
148 # define NFTW_FUNC_T __nftw_func_t
149 #endif
150
151 /* We define PATH_MAX if the system does not provide a definition.
152 This does not artificially limit any operation. PATH_MAX is simply
153 used as a guesstimate for the expected maximal path length.
154 Buffers will be enlarged if necessary. */
155 #ifndef PATH_MAX
156 # define PATH_MAX 1024
157 #endif
158
159 struct dir_data
160 {
161 DIR *stream;
162 int streamfd;
163 char *content;
164 };
165
166 struct known_object
167 {
168 dev_t dev;
169 INO_T ino;
170 };
171
172 struct ftw_data
173 {
174 /* Array with pointers to open directory streams. */
175 struct dir_data **dirstreams;
176 size_t actdir;
177 size_t maxdir;
178
179 /* Buffer containing name of currently processed object. */
180 char *dirbuf;
181 size_t dirbufsize;
182
183 /* Passed as fourth argument to `nftw' callback. The `base' member
184 tracks the content of the `dirbuf'. */
185 struct FTW ftw;
186
187 /* Flags passed to `nftw' function. 0 for `ftw'. */
188 int flags;
189
190 /* Conversion array for flag values. It is the identity mapping for
191 `nftw' calls, otherwise it maps the values to those known by
192 `ftw'. */
193 const int *cvt_arr;
194
195 /* Callback function. We always use the `nftw' form. */
196 NFTW_FUNC_T func;
197
198 /* Device of starting point. Needed for FTW_MOUNT. */
199 dev_t dev;
200
201 /* Data structure for keeping fingerprints of already processed
202 object. This is needed when not using FTW_PHYS. */
203 void *known_objects;
204 };
205
206 static bool
ftw_allocate(struct ftw_data * data,size_t newsize)207 ftw_allocate (struct ftw_data *data, size_t newsize)
208 {
209 void *newp = realloc (data->dirstreams, data->maxdir
210 * sizeof (struct dir_data *)
211 + newsize);
212 if (newp == NULL)
213 return false;
214 data->dirstreams = newp;
215 data->dirbufsize = newsize;
216 data->dirbuf = (char *) data->dirstreams
217 + data->maxdir * sizeof (struct dir_data *);
218 return true;
219 }
220
221 /* Internally we use the FTW_* constants used for `nftw'. When invoked
222 as `ftw', map each flag to the subset of values used by `ftw'. */
223 static const int nftw_arr[] =
224 {
225 FTW_F, FTW_D, FTW_DNR, FTW_NS, FTW_SL, FTW_DP, FTW_SLN
226 };
227
228 static const int ftw_arr[] =
229 {
230 FTW_F, FTW_D, FTW_DNR, FTW_NS, FTW_F, FTW_D, FTW_NS
231 };
232
233
234 /* Forward declarations of local functions. */
235 static int ftw_dir (struct ftw_data *data, struct STRUCT_STAT *st,
236 struct dir_data *old_dir);
237
238
239 static int
object_compare(const void * p1,const void * p2)240 object_compare (const void *p1, const void *p2)
241 {
242 /* We don't need a sophisticated and useful comparison. We are only
243 interested in equality. However, we must be careful not to
244 accidentally compare `holes' in the structure. */
245 const struct known_object *kp1 = p1, *kp2 = p2;
246 int cmp1;
247 cmp1 = (kp1->ino > kp2->ino) - (kp1->ino < kp2->ino);
248 if (cmp1 != 0)
249 return cmp1;
250 return (kp1->dev > kp2->dev) - (kp1->dev < kp2->dev);
251 }
252
253
254 static int
add_object(struct ftw_data * data,struct STRUCT_STAT * st)255 add_object (struct ftw_data *data, struct STRUCT_STAT *st)
256 {
257 struct known_object *newp = malloc (sizeof (struct known_object));
258 if (newp == NULL)
259 return -1;
260 newp->dev = st->st_dev;
261 newp->ino = st->st_ino;
262 return __tsearch (newp, &data->known_objects, object_compare) ? 0 : -1;
263 }
264
265
266 static inline int
find_object(struct ftw_data * data,struct STRUCT_STAT * st)267 find_object (struct ftw_data *data, struct STRUCT_STAT *st)
268 {
269 struct known_object obj;
270 obj.dev = st->st_dev;
271 obj.ino = st->st_ino;
272 return __tfind (&obj, &data->known_objects, object_compare) != NULL;
273 }
274
275
276 static inline int
277 __attribute ((always_inline))
open_dir_stream(int * dfdp,struct ftw_data * data,struct dir_data * dirp)278 open_dir_stream (int *dfdp, struct ftw_data *data, struct dir_data *dirp)
279 {
280 int result = 0;
281
282 if (data->dirstreams[data->actdir] != NULL)
283 {
284 /* Oh, oh. We must close this stream. Get all remaining
285 entries and store them as a list in the `content' member of
286 the `struct dir_data' variable. */
287 size_t bufsize = 1024;
288 char *buf = malloc (bufsize);
289
290 if (buf == NULL)
291 result = -1;
292 else
293 {
294 DIR *st = data->dirstreams[data->actdir]->stream;
295 struct dirent64 *d;
296 size_t actsize = 0;
297
298 while ((d = __readdir64 (st)) != NULL)
299 {
300 size_t this_len = NAMLEN (d);
301 if (actsize + this_len + 2 >= bufsize)
302 {
303 char *newp;
304 bufsize += MAX (1024, 2 * this_len);
305 newp = (char *) realloc (buf, bufsize);
306 if (newp == NULL)
307 {
308 /* No more memory. */
309 int save_err = errno;
310 free (buf);
311 __set_errno (save_err);
312 return -1;
313 }
314 buf = newp;
315 }
316
317 *((char *) __mempcpy (buf + actsize, d->d_name, this_len))
318 = '\0';
319 actsize += this_len + 1;
320 }
321
322 /* Terminate the list with an additional NUL byte. */
323 buf[actsize++] = '\0';
324
325 /* Shrink the buffer to what we actually need. */
326 data->dirstreams[data->actdir]->content = realloc (buf, actsize);
327 if (data->dirstreams[data->actdir]->content == NULL)
328 {
329 int save_err = errno;
330 free (buf);
331 __set_errno (save_err);
332 result = -1;
333 }
334 else
335 {
336 __closedir (st);
337 data->dirstreams[data->actdir]->stream = NULL;
338 data->dirstreams[data->actdir]->streamfd = -1;
339 data->dirstreams[data->actdir] = NULL;
340 }
341 }
342 }
343
344 /* Open the new stream. */
345 if (result == 0)
346 {
347 assert (data->dirstreams[data->actdir] == NULL);
348
349 if (dfdp != NULL && *dfdp != -1)
350 {
351 int fd = __openat64_nocancel (*dfdp, data->dirbuf + data->ftw.base,
352 O_RDONLY | O_DIRECTORY | O_NDELAY);
353 dirp->stream = NULL;
354 if (fd != -1 && (dirp->stream = __fdopendir (fd)) == NULL)
355 __close_nocancel_nostatus (fd);
356 }
357 else
358 {
359 const char *name;
360
361 if (data->flags & FTW_CHDIR)
362 {
363 name = data->dirbuf + data->ftw.base;
364 if (name[0] == '\0')
365 name = ".";
366 }
367 else
368 name = data->dirbuf;
369
370 dirp->stream = __opendir (name);
371 }
372
373 if (dirp->stream == NULL)
374 result = -1;
375 else
376 {
377 dirp->streamfd = __dirfd (dirp->stream);
378 dirp->content = NULL;
379 data->dirstreams[data->actdir] = dirp;
380
381 if (++data->actdir == data->maxdir)
382 data->actdir = 0;
383 }
384 }
385
386 return result;
387 }
388
389
390 static int
process_entry(struct ftw_data * data,struct dir_data * dir,const char * name,size_t namlen,int d_type)391 process_entry (struct ftw_data *data, struct dir_data *dir, const char *name,
392 size_t namlen, int d_type)
393 {
394 struct STRUCT_STAT st;
395 int result = 0;
396 int flag = 0;
397 size_t new_buflen;
398
399 if (name[0] == '.' && (name[1] == '\0'
400 || (name[1] == '.' && name[2] == '\0')))
401 /* Don't process the "." and ".." entries. */
402 return 0;
403
404 new_buflen = data->ftw.base + namlen + 2;
405 if (data->dirbufsize < new_buflen
406 && !ftw_allocate (data, 2 * new_buflen))
407 return -1;
408
409 *((char *) __mempcpy (data->dirbuf + data->ftw.base, name, namlen)) = '\0';
410
411 int statres;
412 if (dir->streamfd != -1)
413 statres = FSTATAT (dir->streamfd, name, &st,
414 (data->flags & FTW_PHYS) ? AT_SYMLINK_NOFOLLOW : 0);
415 else
416 {
417 if ((data->flags & FTW_CHDIR) == 0)
418 name = data->dirbuf;
419
420 statres = ((data->flags & FTW_PHYS)
421 ? LSTAT (name, &st)
422 : STAT (name, &st));
423 }
424
425 if (statres < 0)
426 {
427 if (errno != EACCES && errno != ENOENT)
428 result = -1;
429 else if (data->flags & FTW_PHYS)
430 flag = FTW_NS;
431 else
432 {
433 /* Old code left ST undefined for dangling DT_LNK without
434 FTW_PHYS set; a clarification at the POSIX level suggests
435 it should contain information about the link (ala lstat).
436 We do our best to fill in what data we can. */
437 if (dir->streamfd != -1)
438 statres = FSTATAT (dir->streamfd, name, &st,
439 AT_SYMLINK_NOFOLLOW);
440 else
441 statres = LSTAT (name, &st);
442 if (statres == 0 && S_ISLNK (st.st_mode))
443 flag = FTW_SLN;
444 else
445 flag = FTW_NS;
446 }
447 }
448 else
449 {
450 if (S_ISDIR (st.st_mode))
451 flag = FTW_D;
452 else if (S_ISLNK (st.st_mode))
453 flag = FTW_SL;
454 else
455 flag = FTW_F;
456 }
457
458 if (result == 0
459 && (flag == FTW_NS
460 || !(data->flags & FTW_MOUNT) || st.st_dev == data->dev))
461 {
462 if (flag == FTW_D)
463 {
464 if ((data->flags & FTW_PHYS)
465 || (!find_object (data, &st)
466 /* Remember the object. */
467 && (result = add_object (data, &st)) == 0))
468 result = ftw_dir (data, &st, dir);
469 }
470 else
471 result = (*data->func) (data->dirbuf, &st, data->cvt_arr[flag],
472 &data->ftw);
473 }
474
475 if ((data->flags & FTW_ACTIONRETVAL) && result == FTW_SKIP_SUBTREE)
476 result = 0;
477
478 return result;
479 }
480
481
482 static int
483 __attribute ((noinline))
ftw_dir(struct ftw_data * data,struct STRUCT_STAT * st,struct dir_data * old_dir)484 ftw_dir (struct ftw_data *data, struct STRUCT_STAT *st, struct dir_data *old_dir)
485 {
486 struct dir_data dir;
487 struct dirent64 *d;
488 int previous_base = data->ftw.base;
489 int result;
490 char *startp;
491
492 /* Open the stream for this directory. This might require that
493 another stream has to be closed. */
494 result = open_dir_stream (old_dir == NULL ? NULL : &old_dir->streamfd,
495 data, &dir);
496 if (result != 0)
497 {
498 if (errno == EACCES)
499 /* We cannot read the directory. Signal this with a special flag. */
500 result = (*data->func) (data->dirbuf, st, FTW_DNR, &data->ftw);
501
502 return result;
503 }
504
505 /* First, report the directory (if not depth-first). */
506 if (!(data->flags & FTW_DEPTH))
507 {
508 result = (*data->func) (data->dirbuf, st, FTW_D, &data->ftw);
509 if (result != 0)
510 {
511 int save_err;
512 fail:
513 save_err = errno;
514 __closedir (dir.stream);
515 dir.streamfd = -1;
516 __set_errno (save_err);
517
518 if (data->actdir-- == 0)
519 data->actdir = data->maxdir - 1;
520 data->dirstreams[data->actdir] = NULL;
521 return result;
522 }
523 }
524
525 /* If necessary, change to this directory. */
526 if (data->flags & FTW_CHDIR)
527 {
528 if (__fchdir (__dirfd (dir.stream)) < 0)
529 {
530 result = -1;
531 goto fail;
532 }
533 }
534
535 /* Next, update the `struct FTW' information. */
536 ++data->ftw.level;
537 startp = __rawmemchr (data->dirbuf, '\0');
538 /* There always must be a directory name. */
539 assert (startp != data->dirbuf);
540 if (startp[-1] != '/')
541 *startp++ = '/';
542 data->ftw.base = startp - data->dirbuf;
543
544 while (dir.stream != NULL && (d = __readdir64 (dir.stream)) != NULL)
545 {
546 int d_type = DT_UNKNOWN;
547 #ifdef _DIRENT_HAVE_D_TYPE
548 d_type = d->d_type;
549 #endif
550 result = process_entry (data, &dir, d->d_name, NAMLEN (d), d_type);
551 if (result != 0)
552 break;
553 }
554
555 if (dir.stream != NULL)
556 {
557 /* The stream is still open. I.e., we did not need more
558 descriptors. Simply close the stream now. */
559 int save_err = errno;
560
561 assert (dir.content == NULL);
562
563 __closedir (dir.stream);
564 dir.streamfd = -1;
565 __set_errno (save_err);
566
567 if (data->actdir-- == 0)
568 data->actdir = data->maxdir - 1;
569 data->dirstreams[data->actdir] = NULL;
570 }
571 else
572 {
573 int save_err;
574 char *runp = dir.content;
575
576 while (result == 0 && *runp != '\0')
577 {
578 char *endp = strchr (runp, '\0');
579
580 // XXX Should store the d_type values as well?!
581 result = process_entry (data, &dir, runp, endp - runp, DT_UNKNOWN);
582
583 runp = endp + 1;
584 }
585
586 save_err = errno;
587 free (dir.content);
588 __set_errno (save_err);
589 }
590
591 if ((data->flags & FTW_ACTIONRETVAL) && result == FTW_SKIP_SIBLINGS)
592 result = 0;
593
594 /* Prepare the return, revert the `struct FTW' information. */
595 data->dirbuf[data->ftw.base - 1] = '\0';
596 --data->ftw.level;
597 data->ftw.base = previous_base;
598
599 /* Finally, if we process depth-first report the directory. */
600 if (result == 0 && (data->flags & FTW_DEPTH))
601 result = (*data->func) (data->dirbuf, st, FTW_DP, &data->ftw);
602
603 if (old_dir
604 && (data->flags & FTW_CHDIR)
605 && (result == 0
606 || ((data->flags & FTW_ACTIONRETVAL)
607 && (result != -1 && result != FTW_STOP))))
608 {
609 /* Change back to the parent directory. */
610 int done = 0;
611 if (old_dir->stream != NULL)
612 if (__fchdir (__dirfd (old_dir->stream)) == 0)
613 done = 1;
614
615 if (!done)
616 {
617 if (data->ftw.base == 1)
618 {
619 if (__chdir ("/") < 0)
620 result = -1;
621 }
622 else
623 if (__chdir ("..") < 0)
624 result = -1;
625 }
626 }
627
628 return result;
629 }
630
631
632 static int
633 __attribute ((noinline))
ftw_startup(const char * dir,int is_nftw,void * func,int descriptors,int flags)634 ftw_startup (const char *dir, int is_nftw, void *func, int descriptors,
635 int flags)
636 {
637 struct ftw_data data = { .dirstreams = NULL };
638 struct STRUCT_STAT st;
639 int result = 0;
640 int save_err;
641 int cwdfd = -1;
642 char *cwd = NULL;
643 char *cp;
644
645 /* First make sure the parameters are reasonable. */
646 if (dir[0] == '\0')
647 {
648 __set_errno (ENOENT);
649 return -1;
650 }
651
652 data.maxdir = descriptors < 1 ? 1 : descriptors;
653 data.actdir = 0;
654 /* PATH_MAX is always defined when we get here. */
655 if (!ftw_allocate (&data, MAX (2 * strlen (dir), PATH_MAX)))
656 return -1;
657 memset (data.dirstreams, '\0', data.maxdir * sizeof (struct dir_data *));
658 cp = __stpcpy (data.dirbuf, dir);
659 /* Strip trailing slashes. */
660 while (cp > data.dirbuf + 1 && cp[-1] == '/')
661 --cp;
662 *cp = '\0';
663
664 data.ftw.level = 0;
665
666 /* Find basename. */
667 while (cp > data.dirbuf && cp[-1] != '/')
668 --cp;
669 data.ftw.base = cp - data.dirbuf;
670
671 data.flags = flags;
672
673 /* This assignment might seem to be strange but it is what we want.
674 The trick is that the first three arguments to the `ftw' and
675 `nftw' callback functions are equal. Therefore we can call in
676 every case the callback using the format of the `nftw' version
677 and get the correct result since the stack layout for a function
678 call in C allows this. */
679 data.func = (NFTW_FUNC_T) func;
680
681 /* Since we internally use the complete set of FTW_* values we need
682 to reduce the value range before calling a `ftw' callback. */
683 data.cvt_arr = is_nftw ? nftw_arr : ftw_arr;
684
685 /* No object known so far. */
686 data.known_objects = NULL;
687
688 /* Now go to the directory containing the initial file/directory. */
689 if (flags & FTW_CHDIR)
690 {
691 /* We have to be able to go back to the current working
692 directory. The best way to do this is to use a file
693 descriptor. */
694 cwdfd = __open (".", O_RDONLY | O_DIRECTORY);
695 if (cwdfd == -1)
696 {
697 /* Try getting the directory name. This can be needed if
698 the current directory is executable but not readable. */
699 if (errno == EACCES)
700 /* GNU extension ahead. */
701 cwd = __getcwd (NULL, 0);
702
703 if (cwd == NULL)
704 goto out_fail;
705 }
706 else if (data.maxdir > 1)
707 /* Account for the file descriptor we use here. */
708 --data.maxdir;
709
710 if (data.ftw.base > 0)
711 {
712 /* Change to the directory the file is in. In data.dirbuf
713 we have a writable copy of the file name. Just NUL
714 terminate it for now and change the directory. */
715 if (data.ftw.base == 1)
716 /* I.e., the file is in the root directory. */
717 result = __chdir ("/");
718 else
719 {
720 char ch = data.dirbuf[data.ftw.base - 1];
721 data.dirbuf[data.ftw.base - 1] = '\0';
722 result = __chdir (data.dirbuf);
723 data.dirbuf[data.ftw.base - 1] = ch;
724 }
725 }
726 }
727
728 /* Get stat info for start directory. */
729 if (result == 0)
730 {
731 const char *name;
732
733 if (data.flags & FTW_CHDIR)
734 {
735 name = data.dirbuf + data.ftw.base;
736 if (name[0] == '\0')
737 name = ".";
738 }
739 else
740 name = data.dirbuf;
741
742 if (((flags & FTW_PHYS)
743 ? LSTAT (name, &st)
744 : STAT (name, &st)) < 0)
745 {
746 if (!(flags & FTW_PHYS)
747 && errno == ENOENT
748 && LSTAT (name, &st) == 0
749 && S_ISLNK (st.st_mode))
750 result = (*data.func) (data.dirbuf, &st, data.cvt_arr[FTW_SLN],
751 &data.ftw);
752 else
753 /* No need to call the callback since we cannot say anything
754 about the object. */
755 result = -1;
756 }
757 else
758 {
759 if (S_ISDIR (st.st_mode))
760 {
761 /* Remember the device of the initial directory in case
762 FTW_MOUNT is given. */
763 data.dev = st.st_dev;
764
765 /* We know this directory now. */
766 if (!(flags & FTW_PHYS))
767 result = add_object (&data, &st);
768
769 if (result == 0)
770 result = ftw_dir (&data, &st, NULL);
771 }
772 else
773 {
774 int flag = S_ISLNK (st.st_mode) ? FTW_SL : FTW_F;
775
776 result = (*data.func) (data.dirbuf, &st, data.cvt_arr[flag],
777 &data.ftw);
778 }
779 }
780
781 if ((flags & FTW_ACTIONRETVAL)
782 && (result == FTW_SKIP_SUBTREE || result == FTW_SKIP_SIBLINGS))
783 result = 0;
784 }
785
786 /* Return to the start directory (if necessary). */
787 if (cwdfd != -1)
788 {
789 int save_err = errno;
790 __fchdir (cwdfd);
791 __close_nocancel_nostatus (cwdfd);
792 __set_errno (save_err);
793 }
794 else if (cwd != NULL)
795 {
796 int save_err = errno;
797 __chdir (cwd);
798 free (cwd);
799 __set_errno (save_err);
800 }
801
802 /* Free all memory. */
803 out_fail:
804 save_err = errno;
805 __tdestroy (data.known_objects, free);
806 free (data.dirstreams);
807 __set_errno (save_err);
808
809 return result;
810 }
811
812
813
814 /* Entry points. */
815
816 int
FTW_NAME(const char * path,FTW_FUNC_T func,int descriptors)817 FTW_NAME (const char *path, FTW_FUNC_T func, int descriptors)
818 {
819 return ftw_startup (path, 0, func, descriptors, 0);
820 }
821
822 #ifndef NFTW_OLD_NAME
823 int
NFTW_NAME(const char * path,NFTW_FUNC_T func,int descriptors,int flags)824 NFTW_NAME (const char *path, NFTW_FUNC_T func, int descriptors, int flags)
825 {
826 return ftw_startup (path, 1, func, descriptors, flags);
827 }
828 #else
829
830 # include <shlib-compat.h>
831
832 int NFTW_NEW_NAME (const char *, NFTW_FUNC_T, int, int);
833
834 int
NFTW_NEW_NAME(const char * path,NFTW_FUNC_T func,int descriptors,int flags)835 NFTW_NEW_NAME (const char *path, NFTW_FUNC_T func, int descriptors, int flags)
836 {
837 if (flags
838 & ~(FTW_PHYS | FTW_MOUNT | FTW_CHDIR | FTW_DEPTH | FTW_ACTIONRETVAL))
839 {
840 __set_errno (EINVAL);
841 return -1;
842 }
843 return ftw_startup (path, 1, func, descriptors, flags);
844 }
845 versioned_symbol (libc, NFTW_NEW_NAME, NFTW_NAME, GLIBC_2_3_3);
846
847 # if SHLIB_COMPAT(libc, GLIBC_2_1, GLIBC_2_3_3)
848
849 /* Older nftw* version just ignored all unknown flags. */
850
851 int NFTW_OLD_NAME (const char *, NFTW_FUNC_T, int, int);
852
853 int
854 attribute_compat_text_section
NFTW_OLD_NAME(const char * path,NFTW_FUNC_T func,int descriptors,int flags)855 NFTW_OLD_NAME (const char *path, NFTW_FUNC_T func, int descriptors, int flags)
856 {
857 flags &= (FTW_PHYS | FTW_MOUNT | FTW_CHDIR | FTW_DEPTH);
858 return ftw_startup (path, 1, func, descriptors, flags);
859 }
860
861 compat_symbol (libc, NFTW_OLD_NAME, NFTW_NAME, GLIBC_2_1);
862 # endif
863 #endif /* NFTW_OLD_NAME */
864