1/* File tree walker functions.
2 Copyright (C) 1996-2018 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 <http://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 if (d_type == DT_LNK)
427 flag = FTW_SLN;
428 else
429 {
430 if (dir->streamfd != -1)
431 statres = FXSTATAT (_STAT_VER, dir->streamfd, name, &st,
432 AT_SYMLINK_NOFOLLOW);
433 else
434 statres = LXSTAT (_STAT_VER, name, &st);
435 if (statres == 0 && S_ISLNK (st.st_mode))
436 flag = FTW_SLN;
437 else
438 flag = FTW_NS;
439 }
440 }
441 else
442 {
443 if (S_ISDIR (st.st_mode))
444 flag = FTW_D;
445 else if (S_ISLNK (st.st_mode))
446 flag = FTW_SL;
447 else
448 flag = FTW_F;
449 }
450
451 if (result == 0
452 && (flag == FTW_NS
453 || !(data->flags & FTW_MOUNT) || st.st_dev == data->dev))
454 {
455 if (flag == FTW_D)
456 {
457 if ((data->flags & FTW_PHYS)
458 || (!find_object (data, &st)
459 /* Remember the object. */
460 && (result = add_object (data, &st)) == 0))
461 result = ftw_dir (data, &st, dir);
462 }
463 else
464 result = (*data->func) (data->dirbuf, &st, data->cvt_arr[flag],
465 &data->ftw);
466 }
467
468 if ((data->flags & FTW_ACTIONRETVAL) && result == FTW_SKIP_SUBTREE)
469 result = 0;
470
471 return result;
472}
473
474
475static int
476__attribute ((noinline))
477ftw_dir (struct ftw_data *data, struct STAT *st, struct dir_data *old_dir)
478{
479 struct dir_data dir;
480 struct dirent64 *d;
481 int previous_base = data->ftw.base;
482 int result;
483 char *startp;
484
485 /* Open the stream for this directory. This might require that
486 another stream has to be closed. */
487 result = open_dir_stream (old_dir == NULL ? NULL : &old_dir->streamfd,
488 data, &dir);
489 if (result != 0)
490 {
491 if (errno == EACCES)
492 /* We cannot read the directory. Signal this with a special flag. */
493 result = (*data->func) (data->dirbuf, st, FTW_DNR, &data->ftw);
494
495 return result;
496 }
497
498 /* First, report the directory (if not depth-first). */
499 if (!(data->flags & FTW_DEPTH))
500 {
501 result = (*data->func) (data->dirbuf, st, FTW_D, &data->ftw);
502 if (result != 0)
503 {
504 int save_err;
505fail:
506 save_err = errno;
507 __closedir (dir.stream);
508 dir.streamfd = -1;
509 __set_errno (save_err);
510
511 if (data->actdir-- == 0)
512 data->actdir = data->maxdir - 1;
513 data->dirstreams[data->actdir] = NULL;
514 return result;
515 }
516 }
517
518 /* If necessary, change to this directory. */
519 if (data->flags & FTW_CHDIR)
520 {
521 if (__fchdir (__dirfd (dir.stream)) < 0)
522 {
523 result = -1;
524 goto fail;
525 }
526 }
527
528 /* Next, update the `struct FTW' information. */
529 ++data->ftw.level;
530 startp = __rawmemchr (data->dirbuf, '\0');
531 /* There always must be a directory name. */
532 assert (startp != data->dirbuf);
533 if (startp[-1] != '/')
534 *startp++ = '/';
535 data->ftw.base = startp - data->dirbuf;
536
537 while (dir.stream != NULL && (d = __readdir64 (dir.stream)) != NULL)
538 {
539 int d_type = DT_UNKNOWN;
540#ifdef _DIRENT_HAVE_D_TYPE
541 d_type = d->d_type;
542#endif
543 result = process_entry (data, &dir, d->d_name, NAMLEN (d), d_type);
544 if (result != 0)
545 break;
546 }
547
548 if (dir.stream != NULL)
549 {
550 /* The stream is still open. I.e., we did not need more
551 descriptors. Simply close the stream now. */
552 int save_err = errno;
553
554 assert (dir.content == NULL);
555
556 __closedir (dir.stream);
557 dir.streamfd = -1;
558 __set_errno (save_err);
559
560 if (data->actdir-- == 0)
561 data->actdir = data->maxdir - 1;
562 data->dirstreams[data->actdir] = NULL;
563 }
564 else
565 {
566 int save_err;
567 char *runp = dir.content;
568
569 while (result == 0 && *runp != '\0')
570 {
571 char *endp = strchr (runp, '\0');
572
573 // XXX Should store the d_type values as well?!
574 result = process_entry (data, &dir, runp, endp - runp, DT_UNKNOWN);
575
576 runp = endp + 1;
577 }
578
579 save_err = errno;
580 free (dir.content);
581 __set_errno (save_err);
582 }
583
584 if ((data->flags & FTW_ACTIONRETVAL) && result == FTW_SKIP_SIBLINGS)
585 result = 0;
586
587 /* Prepare the return, revert the `struct FTW' information. */
588 data->dirbuf[data->ftw.base - 1] = '\0';
589 --data->ftw.level;
590 data->ftw.base = previous_base;
591
592 /* Finally, if we process depth-first report the directory. */
593 if (result == 0 && (data->flags & FTW_DEPTH))
594 result = (*data->func) (data->dirbuf, st, FTW_DP, &data->ftw);
595
596 if (old_dir
597 && (data->flags & FTW_CHDIR)
598 && (result == 0
599 || ((data->flags & FTW_ACTIONRETVAL)
600 && (result != -1 && result != FTW_STOP))))
601 {
602 /* Change back to the parent directory. */
603 int done = 0;
604 if (old_dir->stream != NULL)
605 if (__fchdir (__dirfd (old_dir->stream)) == 0)
606 done = 1;
607
608 if (!done)
609 {
610 if (data->ftw.base == 1)
611 {
612 if (__chdir ("/") < 0)
613 result = -1;
614 }
615 else
616 if (__chdir ("..") < 0)
617 result = -1;
618 }
619 }
620
621 return result;
622}
623
624
625static int
626__attribute ((noinline))
627ftw_startup (const char *dir, int is_nftw, void *func, int descriptors,
628 int flags)
629{
630 struct ftw_data data;
631 struct STAT st;
632 int result = 0;
633 int save_err;
634 int cwdfd = -1;
635 char *cwd = NULL;
636 char *cp;
637
638 /* First make sure the parameters are reasonable. */
639 if (dir[0] == '\0')
640 {
641 __set_errno (ENOENT);
642 return -1;
643 }
644
645 data.maxdir = descriptors < 1 ? 1 : descriptors;
646 data.actdir = 0;
647 data.dirstreams = (struct dir_data **) alloca (data.maxdir
648 * sizeof (struct dir_data *));
649 memset (data.dirstreams, '\0', data.maxdir * sizeof (struct dir_data *));
650
651 /* PATH_MAX is always defined when we get here. */
652 data.dirbufsize = MAX (2 * strlen (dir), PATH_MAX);
653 data.dirbuf = (char *) malloc (data.dirbufsize);
654 if (data.dirbuf == NULL)
655 return -1;
656 cp = __stpcpy (data.dirbuf, dir);
657 /* Strip trailing slashes. */
658 while (cp > data.dirbuf + 1 && cp[-1] == '/')
659 --cp;
660 *cp = '\0';
661
662 data.ftw.level = 0;
663
664 /* Find basename. */
665 while (cp > data.dirbuf && cp[-1] != '/')
666 --cp;
667 data.ftw.base = cp - data.dirbuf;
668
669 data.flags = flags;
670
671 /* This assignment might seem to be strange but it is what we want.
672 The trick is that the first three arguments to the `ftw' and
673 `nftw' callback functions are equal. Therefore we can call in
674 every case the callback using the format of the `nftw' version
675 and get the correct result since the stack layout for a function
676 call in C allows this. */
677 data.func = (NFTW_FUNC_T) func;
678
679 /* Since we internally use the complete set of FTW_* values we need
680 to reduce the value range before calling a `ftw' callback. */
681 data.cvt_arr = is_nftw ? nftw_arr : ftw_arr;
682
683 /* No object known so far. */
684 data.known_objects = NULL;
685
686 /* Now go to the directory containing the initial file/directory. */
687 if (flags & FTW_CHDIR)
688 {
689 /* We have to be able to go back to the current working
690 directory. The best way to do this is to use a file
691 descriptor. */
692 cwdfd = __open (".", O_RDONLY | O_DIRECTORY);
693 if (cwdfd == -1)
694 {
695 /* Try getting the directory name. This can be needed if
696 the current directory is executable but not readable. */
697 if (errno == EACCES)
698 /* GNU extension ahead. */
699 cwd = __getcwd (NULL, 0);
700
701 if (cwd == NULL)
702 goto out_fail;
703 }
704 else if (data.maxdir > 1)
705 /* Account for the file descriptor we use here. */
706 --data.maxdir;
707
708 if (data.ftw.base > 0)
709 {
710 /* Change to the directory the file is in. In data.dirbuf
711 we have a writable copy of the file name. Just NUL
712 terminate it for now and change the directory. */
713 if (data.ftw.base == 1)
714 /* I.e., the file is in the root directory. */
715 result = __chdir ("/");
716 else
717 {
718 char ch = data.dirbuf[data.ftw.base - 1];
719 data.dirbuf[data.ftw.base - 1] = '\0';
720 result = __chdir (data.dirbuf);
721 data.dirbuf[data.ftw.base - 1] = ch;
722 }
723 }
724 }
725
726 /* Get stat info for start directory. */
727 if (result == 0)
728 {
729 const char *name;
730
731 if (data.flags & FTW_CHDIR)
732 {
733 name = data.dirbuf + data.ftw.base;
734 if (name[0] == '\0')
735 name = ".";
736 }
737 else
738 name = data.dirbuf;
739
740 if (((flags & FTW_PHYS)
741 ? LXSTAT (_STAT_VER, name, &st)
742 : XSTAT (_STAT_VER, name, &st)) < 0)
743 {
744 if (!(flags & FTW_PHYS)
745 && errno == ENOENT
746 && LXSTAT (_STAT_VER, name, &st) == 0
747 && S_ISLNK (st.st_mode))
748 result = (*data.func) (data.dirbuf, &st, data.cvt_arr[FTW_SLN],
749 &data.ftw);
750 else
751 /* No need to call the callback since we cannot say anything
752 about the object. */
753 result = -1;
754 }
755 else
756 {
757 if (S_ISDIR (st.st_mode))
758 {
759 /* Remember the device of the initial directory in case
760 FTW_MOUNT is given. */
761 data.dev = st.st_dev;
762
763 /* We know this directory now. */
764 if (!(flags & FTW_PHYS))
765 result = add_object (&data, &st);
766
767 if (result == 0)
768 result = ftw_dir (&data, &st, NULL);
769 }
770 else
771 {
772 int flag = S_ISLNK (st.st_mode) ? FTW_SL : FTW_F;
773
774 result = (*data.func) (data.dirbuf, &st, data.cvt_arr[flag],
775 &data.ftw);
776 }
777 }
778
779 if ((flags & FTW_ACTIONRETVAL)
780 && (result == FTW_SKIP_SUBTREE || result == FTW_SKIP_SIBLINGS))
781 result = 0;
782 }
783
784 /* Return to the start directory (if necessary). */
785 if (cwdfd != -1)
786 {
787 int save_err = errno;
788 __fchdir (cwdfd);
789 __close_nocancel_nostatus (cwdfd);
790 __set_errno (save_err);
791 }
792 else if (cwd != NULL)
793 {
794 int save_err = errno;
795 __chdir (cwd);
796 free (cwd);
797 __set_errno (save_err);
798 }
799
800 /* Free all memory. */
801 out_fail:
802 save_err = errno;
803 __tdestroy (data.known_objects, free);
804 free (data.dirbuf);
805 __set_errno (save_err);
806
807 return result;
808}
809
810
811
812/* Entry points. */
813
814int
815FTW_NAME (const char *path, FTW_FUNC_T func, int descriptors)
816{
817 return ftw_startup (path, 0, func, descriptors, 0);
818}
819
820#ifndef _LIBC
821int
822NFTW_NAME (const char *path, NFTW_FUNC_T func, int descriptors, int flags)
823{
824 return ftw_startup (path, 1, func, descriptors, flags);
825}
826#else
827
828# include <shlib-compat.h>
829
830int NFTW_NEW_NAME (const char *, NFTW_FUNC_T, int, int);
831
832int
833NFTW_NEW_NAME (const char *path, NFTW_FUNC_T func, int descriptors, int flags)
834{
835 if (flags
836 & ~(FTW_PHYS | FTW_MOUNT | FTW_CHDIR | FTW_DEPTH | FTW_ACTIONRETVAL))
837 {
838 __set_errno (EINVAL);
839 return -1;
840 }
841 return ftw_startup (path, 1, func, descriptors, flags);
842}
843
844versioned_symbol (libc, NFTW_NEW_NAME, NFTW_NAME, GLIBC_2_3_3);
845
846# if SHLIB_COMPAT(libc, GLIBC_2_1, GLIBC_2_3_3)
847
848/* Older nftw* version just ignored all unknown flags. */
849
850int NFTW_OLD_NAME (const char *, NFTW_FUNC_T, int, int);
851
852int
853attribute_compat_text_section
854NFTW_OLD_NAME (const char *path, NFTW_FUNC_T func, int descriptors, int flags)
855{
856 flags &= (FTW_PHYS | FTW_MOUNT | FTW_CHDIR | FTW_DEPTH);
857 return ftw_startup (path, 1, func, descriptors, flags);
858}
859
860compat_symbol (libc, NFTW_OLD_NAME, NFTW_NAME, GLIBC_2_1);
861# endif
862#endif
863