1/* File tree walker functions.
2 Copyright (C) 1996-2020 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
5
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public
8 License as published by the Free Software Foundation; either
9 version 2.1 of the License, or (at your option) any later version.
10
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
15
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, see
18 <https://www.gnu.org/licenses/>. */
19
20#ifdef HAVE_CONFIG_H
21# include <config.h>
22#endif
23
24#if __GNUC__
25# define alloca __builtin_alloca
26#else
27# if HAVE_ALLOCA_H
28# include <alloca.h>
29# else
30# ifdef _AIX
31 # pragma alloca
32# else
33char *alloca ();
34# endif
35# endif
36#endif
37
38#ifdef _LIBC
39# include <dirent.h>
40# define NAMLEN(dirent) _D_EXACT_NAMLEN (dirent)
41#else
42# if HAVE_DIRENT_H
43# include <dirent.h>
44# define NAMLEN(dirent) strlen ((dirent)->d_name)
45# else
46# define dirent direct
47# define NAMLEN(dirent) (dirent)->d_namlen
48# if HAVE_SYS_NDIR_H
49# include <sys/ndir.h>
50# endif
51# if HAVE_SYS_DIR_H
52# include <sys/dir.h>
53# endif
54# if HAVE_NDIR_H
55# include <ndir.h>
56# endif
57# endif
58#endif
59
60#include <errno.h>
61#include <fcntl.h>
62#include <ftw.h>
63#include <limits.h>
64#include <search.h>
65#include <stdlib.h>
66#include <string.h>
67#include <unistd.h>
68#include <not-cancel.h>
69#include <sys/param.h>
70#ifdef _LIBC
71# include <include/sys/stat.h>
72#else
73# include <sys/stat.h>
74#endif
75
76#if ! _LIBC && !HAVE_DECL_STPCPY && !defined stpcpy
77char *stpcpy ();
78#endif
79
80#if ! _LIBC && ! defined HAVE_MEMPCPY && ! defined mempcpy
81/* Be CAREFUL that there are no side effects in N. */
82# define mempcpy(D, S, N) ((void *) ((char *) memcpy (D, S, N) + (N)))
83#endif
84
85/* #define NDEBUG 1 */
86#include <assert.h>
87
88#ifndef _LIBC
89# undef __chdir
90# define __chdir chdir
91# undef __closedir
92# define __closedir closedir
93# undef __fchdir
94# define __fchdir fchdir
95# undef __getcwd
96# define __getcwd(P, N) xgetcwd ()
97extern char *xgetcwd (void);
98# undef __mempcpy
99# define __mempcpy mempcpy
100# undef __opendir
101# define __opendir opendir
102# undef __readdir64
103# define __readdir64 readdir
104# undef __stpcpy
105# define __stpcpy stpcpy
106# undef __tdestroy
107# define __tdestroy tdestroy
108# undef __tfind
109# define __tfind tfind
110# undef __tsearch
111# define __tsearch tsearch
112# undef dirent64
113# define dirent64 dirent
114# undef MAX
115# define MAX(a, b) ((a) > (b) ? (a) : (b))
116#endif
117
118/* Arrange to make lstat calls go through the wrapper function
119 on systems with an lstat function that does not dereference symlinks
120 that are specified with a trailing slash. */
121#if ! _LIBC && ! LSTAT_FOLLOWS_SLASHED_SYMLINK
122int rpl_lstat (const char *, struct stat *);
123# undef lstat
124# define lstat(Name, Stat_buf) rpl_lstat(Name, Stat_buf)
125#endif
126
127#ifndef __set_errno
128# define __set_errno(Val) errno = (Val)
129#endif
130
131/* Support for the LFS API version. */
132#ifndef FTW_NAME
133# define FTW_NAME ftw
134# define NFTW_NAME nftw
135# define NFTW_OLD_NAME __old_nftw
136# define NFTW_NEW_NAME __new_nftw
137# define INO_T ino_t
138# define STAT stat
139# ifdef _LIBC
140# define LXSTAT __lxstat
141# define XSTAT __xstat
142# define FXSTATAT __fxstatat
143# else
144# define LXSTAT(V,f,sb) lstat (f,sb)
145# define XSTAT(V,f,sb) stat (f,sb)
146# define FXSTATAT(V,d,f,sb,m) fstatat (d, f, sb, m)
147# endif
148# define FTW_FUNC_T __ftw_func_t
149# define NFTW_FUNC_T __nftw_func_t
150#endif
151
152/* We define PATH_MAX if the system does not provide a definition.
153 This does not artificially limit any operation. PATH_MAX is simply
154 used as a guesstimate for the expected maximal path length.
155 Buffers will be enlarged if necessary. */
156#ifndef PATH_MAX
157# define PATH_MAX 1024
158#endif
159
160struct dir_data
161{
162 DIR *stream;
163 int streamfd;
164 char *content;
165};
166
167struct known_object
168{
169 dev_t dev;
170 INO_T ino;
171};
172
173struct ftw_data
174{
175 /* Array with pointers to open directory streams. */
176 struct dir_data **dirstreams;
177 size_t actdir;
178 size_t maxdir;
179
180 /* Buffer containing name of currently processed object. */
181 char *dirbuf;
182 size_t dirbufsize;
183
184 /* Passed as fourth argument to `nftw' callback. The `base' member
185 tracks the content of the `dirbuf'. */
186 struct FTW ftw;
187
188 /* Flags passed to `nftw' function. 0 for `ftw'. */
189 int flags;
190
191 /* Conversion array for flag values. It is the identity mapping for
192 `nftw' calls, otherwise it maps the values to those known by
193 `ftw'. */
194 const int *cvt_arr;
195
196 /* Callback function. We always use the `nftw' form. */
197 NFTW_FUNC_T func;
198
199 /* Device of starting point. Needed for FTW_MOUNT. */
200 dev_t dev;
201
202 /* Data structure for keeping fingerprints of already processed
203 object. This is needed when not using FTW_PHYS. */
204 void *known_objects;
205};
206
207
208/* Internally we use the FTW_* constants used for `nftw'. When invoked
209 as `ftw', map each flag to the subset of values used by `ftw'. */
210static const int nftw_arr[] =
211{
212 FTW_F, FTW_D, FTW_DNR, FTW_NS, FTW_SL, FTW_DP, FTW_SLN
213};
214
215static const int ftw_arr[] =
216{
217 FTW_F, FTW_D, FTW_DNR, FTW_NS, FTW_F, FTW_D, FTW_NS
218};
219
220
221/* Forward declarations of local functions. */
222static int ftw_dir (struct ftw_data *data, struct STAT *st,
223 struct dir_data *old_dir);
224
225
226static int
227object_compare (const void *p1, const void *p2)
228{
229 /* We don't need a sophisticated and useful comparison. We are only
230 interested in equality. However, we must be careful not to
231 accidentally compare `holes' in the structure. */
232 const struct known_object *kp1 = p1, *kp2 = p2;
233 int cmp1;
234 cmp1 = (kp1->ino > kp2->ino) - (kp1->ino < kp2->ino);
235 if (cmp1 != 0)
236 return cmp1;
237 return (kp1->dev > kp2->dev) - (kp1->dev < kp2->dev);
238}
239
240
241static int
242add_object (struct ftw_data *data, struct STAT *st)
243{
244 struct known_object *newp = malloc (sizeof (struct known_object));
245 if (newp == NULL)
246 return -1;
247 newp->dev = st->st_dev;
248 newp->ino = st->st_ino;
249 return __tsearch (newp, &data->known_objects, object_compare) ? 0 : -1;
250}
251
252
253static inline int
254find_object (struct ftw_data *data, struct STAT *st)
255{
256 struct known_object obj;
257 obj.dev = st->st_dev;
258 obj.ino = st->st_ino;
259 return __tfind (&obj, &data->known_objects, object_compare) != NULL;
260}
261
262
263static inline int
264__attribute ((always_inline))
265open_dir_stream (int *dfdp, struct ftw_data *data, struct dir_data *dirp)
266{
267 int result = 0;
268
269 if (data->dirstreams[data->actdir] != NULL)
270 {
271 /* Oh, oh. We must close this stream. Get all remaining
272 entries and store them as a list in the `content' member of
273 the `struct dir_data' variable. */
274 size_t bufsize = 1024;
275 char *buf = malloc (bufsize);
276
277 if (buf == NULL)
278 result = -1;
279 else
280 {
281 DIR *st = data->dirstreams[data->actdir]->stream;
282 struct dirent64 *d;
283 size_t actsize = 0;
284
285 while ((d = __readdir64 (st)) != NULL)
286 {
287 size_t this_len = NAMLEN (d);
288 if (actsize + this_len + 2 >= bufsize)
289 {
290 char *newp;
291 bufsize += MAX (1024, 2 * this_len);
292 newp = (char *) realloc (buf, bufsize);
293 if (newp == NULL)
294 {
295 /* No more memory. */
296 int save_err = errno;
297 free (buf);
298 __set_errno (save_err);
299 return -1;
300 }
301 buf = newp;
302 }
303
304 *((char *) __mempcpy (buf + actsize, d->d_name, this_len))
305 = '\0';
306 actsize += this_len + 1;
307 }
308
309 /* Terminate the list with an additional NUL byte. */
310 buf[actsize++] = '\0';
311
312 /* Shrink the buffer to what we actually need. */
313 data->dirstreams[data->actdir]->content = realloc (buf, actsize);
314 if (data->dirstreams[data->actdir]->content == NULL)
315 {
316 int save_err = errno;
317 free (buf);
318 __set_errno (save_err);
319 result = -1;
320 }
321 else
322 {
323 __closedir (st);
324 data->dirstreams[data->actdir]->stream = NULL;
325 data->dirstreams[data->actdir]->streamfd = -1;
326 data->dirstreams[data->actdir] = NULL;
327 }
328 }
329 }
330
331 /* Open the new stream. */
332 if (result == 0)
333 {
334 assert (data->dirstreams[data->actdir] == NULL);
335
336 if (dfdp != NULL && *dfdp != -1)
337 {
338 int fd = __openat64_nocancel (*dfdp, data->dirbuf + data->ftw.base,
339 O_RDONLY | O_DIRECTORY | O_NDELAY);
340 dirp->stream = NULL;
341 if (fd != -1 && (dirp->stream = __fdopendir (fd)) == NULL)
342 __close_nocancel_nostatus (fd);
343 }
344 else
345 {
346 const char *name;
347
348 if (data->flags & FTW_CHDIR)
349 {
350 name = data->dirbuf + data->ftw.base;
351 if (name[0] == '\0')
352 name = ".";
353 }
354 else
355 name = data->dirbuf;
356
357 dirp->stream = __opendir (name);
358 }
359
360 if (dirp->stream == NULL)
361 result = -1;
362 else
363 {
364 dirp->streamfd = __dirfd (dirp->stream);
365 dirp->content = NULL;
366 data->dirstreams[data->actdir] = dirp;
367
368 if (++data->actdir == data->maxdir)
369 data->actdir = 0;
370 }
371 }
372
373 return result;
374}
375
376
377static int
378process_entry (struct ftw_data *data, struct dir_data *dir, const char *name,
379 size_t namlen, int d_type)
380{
381 struct STAT st;
382 int result = 0;
383 int flag = 0;
384 size_t new_buflen;
385
386 if (name[0] == '.' && (name[1] == '\0'
387 || (name[1] == '.' && name[2] == '\0')))
388 /* Don't process the "." and ".." entries. */
389 return 0;
390
391 new_buflen = data->ftw.base + namlen + 2;
392 if (data->dirbufsize < new_buflen)
393 {
394 /* Enlarge the buffer. */
395 char *newp;
396
397 data->dirbufsize = 2 * new_buflen;
398 newp = (char *) realloc (data->dirbuf, data->dirbufsize);
399 if (newp == NULL)
400 return -1;
401 data->dirbuf = newp;
402 }
403
404 *((char *) __mempcpy (data->dirbuf + data->ftw.base, name, namlen)) = '\0';
405
406 int statres;
407 if (dir->streamfd != -1)
408 statres = FXSTATAT (_STAT_VER, dir->streamfd, name, &st,
409 (data->flags & FTW_PHYS) ? AT_SYMLINK_NOFOLLOW : 0);
410 else
411 {
412 if ((data->flags & FTW_CHDIR) == 0)
413 name = data->dirbuf;
414
415 statres = ((data->flags & FTW_PHYS)
416 ? LXSTAT (_STAT_VER, name, &st)
417 : XSTAT (_STAT_VER, name, &st));
418 }
419
420 if (statres < 0)
421 {
422 if (errno != EACCES && errno != ENOENT)
423 result = -1;
424 else if (data->flags & FTW_PHYS)
425 flag = FTW_NS;
426 else
427 {
428 /* Old code left ST undefined for dangling DT_LNK without
429 FTW_PHYS set; a clarification at the POSIX level suggests
430 it should contain information about the link (ala lstat).
431 We do our best to fill in what data we can. */
432 if (dir->streamfd != -1)
433 statres = FXSTATAT (_STAT_VER, dir->streamfd, name, &st,
434 AT_SYMLINK_NOFOLLOW);
435 else
436 statres = LXSTAT (_STAT_VER, name, &st);
437 if (statres == 0 && S_ISLNK (st.st_mode))
438 flag = FTW_SLN;
439 else
440 flag = FTW_NS;
441 }
442 }
443 else
444 {
445 if (S_ISDIR (st.st_mode))
446 flag = FTW_D;
447 else if (S_ISLNK (st.st_mode))
448 flag = FTW_SL;
449 else
450 flag = FTW_F;
451 }
452
453 if (result == 0
454 && (flag == FTW_NS
455 || !(data->flags & FTW_MOUNT) || st.st_dev == data->dev))
456 {
457 if (flag == FTW_D)
458 {
459 if ((data->flags & FTW_PHYS)
460 || (!find_object (data, &st)
461 /* Remember the object. */
462 && (result = add_object (data, &st)) == 0))
463 result = ftw_dir (data, &st, dir);
464 }
465 else
466 result = (*data->func) (data->dirbuf, &st, data->cvt_arr[flag],
467 &data->ftw);
468 }
469
470 if ((data->flags & FTW_ACTIONRETVAL) && result == FTW_SKIP_SUBTREE)
471 result = 0;
472
473 return result;
474}
475
476
477static int
478__attribute ((noinline))
479ftw_dir (struct ftw_data *data, struct STAT *st, struct dir_data *old_dir)
480{
481 struct dir_data dir;
482 struct dirent64 *d;
483 int previous_base = data->ftw.base;
484 int result;
485 char *startp;
486
487 /* Open the stream for this directory. This might require that
488 another stream has to be closed. */
489 result = open_dir_stream (old_dir == NULL ? NULL : &old_dir->streamfd,
490 data, &dir);
491 if (result != 0)
492 {
493 if (errno == EACCES)
494 /* We cannot read the directory. Signal this with a special flag. */
495 result = (*data->func) (data->dirbuf, st, FTW_DNR, &data->ftw);
496
497 return result;
498 }
499
500 /* First, report the directory (if not depth-first). */
501 if (!(data->flags & FTW_DEPTH))
502 {
503 result = (*data->func) (data->dirbuf, st, FTW_D, &data->ftw);
504 if (result != 0)
505 {
506 int save_err;
507fail:
508 save_err = errno;
509 __closedir (dir.stream);
510 dir.streamfd = -1;
511 __set_errno (save_err);
512
513 if (data->actdir-- == 0)
514 data->actdir = data->maxdir - 1;
515 data->dirstreams[data->actdir] = NULL;
516 return result;
517 }
518 }
519
520 /* If necessary, change to this directory. */
521 if (data->flags & FTW_CHDIR)
522 {
523 if (__fchdir (__dirfd (dir.stream)) < 0)
524 {
525 result = -1;
526 goto fail;
527 }
528 }
529
530 /* Next, update the `struct FTW' information. */
531 ++data->ftw.level;
532 startp = __rawmemchr (data->dirbuf, '\0');
533 /* There always must be a directory name. */
534 assert (startp != data->dirbuf);
535 if (startp[-1] != '/')
536 *startp++ = '/';
537 data->ftw.base = startp - data->dirbuf;
538
539 while (dir.stream != NULL && (d = __readdir64 (dir.stream)) != NULL)
540 {
541 int d_type = DT_UNKNOWN;
542#ifdef _DIRENT_HAVE_D_TYPE
543 d_type = d->d_type;
544#endif
545 result = process_entry (data, &dir, d->d_name, NAMLEN (d), d_type);
546 if (result != 0)
547 break;
548 }
549
550 if (dir.stream != NULL)
551 {
552 /* The stream is still open. I.e., we did not need more
553 descriptors. Simply close the stream now. */
554 int save_err = errno;
555
556 assert (dir.content == NULL);
557
558 __closedir (dir.stream);
559 dir.streamfd = -1;
560 __set_errno (save_err);
561
562 if (data->actdir-- == 0)
563 data->actdir = data->maxdir - 1;
564 data->dirstreams[data->actdir] = NULL;
565 }
566 else
567 {
568 int save_err;
569 char *runp = dir.content;
570
571 while (result == 0 && *runp != '\0')
572 {
573 char *endp = strchr (runp, '\0');
574
575 // XXX Should store the d_type values as well?!
576 result = process_entry (data, &dir, runp, endp - runp, DT_UNKNOWN);
577
578 runp = endp + 1;
579 }
580
581 save_err = errno;
582 free (dir.content);
583 __set_errno (save_err);
584 }
585
586 if ((data->flags & FTW_ACTIONRETVAL) && result == FTW_SKIP_SIBLINGS)
587 result = 0;
588
589 /* Prepare the return, revert the `struct FTW' information. */
590 data->dirbuf[data->ftw.base - 1] = '\0';
591 --data->ftw.level;
592 data->ftw.base = previous_base;
593
594 /* Finally, if we process depth-first report the directory. */
595 if (result == 0 && (data->flags & FTW_DEPTH))
596 result = (*data->func) (data->dirbuf, st, FTW_DP, &data->ftw);
597
598 if (old_dir
599 && (data->flags & FTW_CHDIR)
600 && (result == 0
601 || ((data->flags & FTW_ACTIONRETVAL)
602 && (result != -1 && result != FTW_STOP))))
603 {
604 /* Change back to the parent directory. */
605 int done = 0;
606 if (old_dir->stream != NULL)
607 if (__fchdir (__dirfd (old_dir->stream)) == 0)
608 done = 1;
609
610 if (!done)
611 {
612 if (data->ftw.base == 1)
613 {
614 if (__chdir ("/") < 0)
615 result = -1;
616 }
617 else
618 if (__chdir ("..") < 0)
619 result = -1;
620 }
621 }
622
623 return result;
624}
625
626
627static int
628__attribute ((noinline))
629ftw_startup (const char *dir, int is_nftw, void *func, int descriptors,
630 int flags)
631{
632 struct ftw_data data;
633 struct STAT st;
634 int result = 0;
635 int save_err;
636 int cwdfd = -1;
637 char *cwd = NULL;
638 char *cp;
639
640 /* First make sure the parameters are reasonable. */
641 if (dir[0] == '\0')
642 {
643 __set_errno (ENOENT);
644 return -1;
645 }
646
647 data.maxdir = descriptors < 1 ? 1 : descriptors;
648 data.actdir = 0;
649 data.dirstreams = (struct dir_data **) alloca (data.maxdir
650 * sizeof (struct dir_data *));
651 memset (data.dirstreams, '\0', data.maxdir * sizeof (struct dir_data *));
652
653 /* PATH_MAX is always defined when we get here. */
654 data.dirbufsize = MAX (2 * strlen (dir), PATH_MAX);
655 data.dirbuf = (char *) malloc (data.dirbufsize);
656 if (data.dirbuf == NULL)
657 return -1;
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 ? LXSTAT (_STAT_VER, name, &st)
744 : XSTAT (_STAT_VER, name, &st)) < 0)
745 {
746 if (!(flags & FTW_PHYS)
747 && errno == ENOENT
748 && LXSTAT (_STAT_VER, 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.dirbuf);
807 __set_errno (save_err);
808
809 return result;
810}
811
812
813
814/* Entry points. */
815
816int
817FTW_NAME (const char *path, FTW_FUNC_T func, int descriptors)
818{
819 return ftw_startup (path, 0, func, descriptors, 0);
820}
821
822#ifndef _LIBC
823int
824NFTW_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
832int NFTW_NEW_NAME (const char *, NFTW_FUNC_T, int, int);
833
834int
835NFTW_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
846versioned_symbol (libc, NFTW_NEW_NAME, NFTW_NAME, GLIBC_2_3_3);
847
848# if SHLIB_COMPAT(libc, GLIBC_2_1, GLIBC_2_3_3)
849
850/* Older nftw* version just ignored all unknown flags. */
851
852int NFTW_OLD_NAME (const char *, NFTW_FUNC_T, int, int);
853
854int
855attribute_compat_text_section
856NFTW_OLD_NAME (const char *path, NFTW_FUNC_T func, int descriptors, int flags)
857{
858 flags &= (FTW_PHYS | FTW_MOUNT | FTW_CHDIR | FTW_DEPTH);
859 return ftw_startup (path, 1, func, descriptors, flags);
860}
861
862compat_symbol (libc, NFTW_OLD_NAME, NFTW_NAME, GLIBC_2_1);
863# endif
864#endif
865