1/* File tree walker functions.
2 Copyright (C) 1996-2022 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
32char *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
76char *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 ()
96extern 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
121int 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
159struct dir_data
160{
161 DIR *stream;
162 int streamfd;
163 char *content;
164};
165
166struct known_object
167{
168 dev_t dev;
169 INO_T ino;
170};
171
172struct 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
206static bool
207ftw_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'. */
223static const int nftw_arr[] =
224{
225 FTW_F, FTW_D, FTW_DNR, FTW_NS, FTW_SL, FTW_DP, FTW_SLN
226};
227
228static 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. */
235static int ftw_dir (struct ftw_data *data, struct STRUCT_STAT *st,
236 struct dir_data *old_dir);
237
238
239static int
240object_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
254static int
255add_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
266static inline int
267find_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
276static inline int
277__attribute ((always_inline))
278open_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 void *content = realloc (buf, actsize);
327 data->dirstreams[data->actdir]->content = content;
328 if (content == NULL)
329 {
330 int save_err = errno;
331 free (buf);
332 __set_errno (save_err);
333 result = -1;
334 }
335 else
336 {
337 __closedir (st);
338 data->dirstreams[data->actdir]->stream = NULL;
339 data->dirstreams[data->actdir]->streamfd = -1;
340 data->dirstreams[data->actdir] = NULL;
341 }
342 }
343 }
344
345 /* Open the new stream. */
346 if (result == 0)
347 {
348 assert (data->dirstreams[data->actdir] == NULL);
349
350 if (dfdp != NULL && *dfdp != -1)
351 {
352 int fd = __openat64_nocancel (*dfdp, data->dirbuf + data->ftw.base,
353 O_RDONLY | O_DIRECTORY | O_NDELAY);
354 dirp->stream = NULL;
355 if (fd != -1 && (dirp->stream = __fdopendir (fd)) == NULL)
356 __close_nocancel_nostatus (fd);
357 }
358 else
359 {
360 const char *name;
361
362 if (data->flags & FTW_CHDIR)
363 {
364 name = data->dirbuf + data->ftw.base;
365 if (name[0] == '\0')
366 name = ".";
367 }
368 else
369 name = data->dirbuf;
370
371 dirp->stream = __opendir (name);
372 }
373
374 if (dirp->stream == NULL)
375 result = -1;
376 else
377 {
378 dirp->streamfd = __dirfd (dirp->stream);
379 dirp->content = NULL;
380 data->dirstreams[data->actdir] = dirp;
381
382 if (++data->actdir == data->maxdir)
383 data->actdir = 0;
384 }
385 }
386
387 return result;
388}
389
390
391static int
392process_entry (struct ftw_data *data, struct dir_data *dir, const char *name,
393 size_t namlen, int d_type)
394{
395 struct STRUCT_STAT st;
396 int result = 0;
397 int flag = 0;
398 size_t new_buflen;
399
400 if (name[0] == '.' && (name[1] == '\0'
401 || (name[1] == '.' && name[2] == '\0')))
402 /* Don't process the "." and ".." entries. */
403 return 0;
404
405 new_buflen = data->ftw.base + namlen + 2;
406 if (data->dirbufsize < new_buflen
407 && !ftw_allocate (data, 2 * new_buflen))
408 return -1;
409
410 *((char *) __mempcpy (data->dirbuf + data->ftw.base, name, namlen)) = '\0';
411
412 int statres;
413 if (dir->streamfd != -1)
414 statres = FSTATAT (dir->streamfd, name, &st,
415 (data->flags & FTW_PHYS) ? AT_SYMLINK_NOFOLLOW : 0);
416 else
417 {
418 if ((data->flags & FTW_CHDIR) == 0)
419 name = data->dirbuf;
420
421 statres = ((data->flags & FTW_PHYS)
422 ? LSTAT (name, &st)
423 : STAT (name, &st));
424 }
425
426 if (statres < 0)
427 {
428 if (errno != EACCES && errno != ENOENT)
429 result = -1;
430 else if (data->flags & FTW_PHYS)
431 flag = FTW_NS;
432 else
433 {
434 /* Old code left ST undefined for dangling DT_LNK without
435 FTW_PHYS set; a clarification at the POSIX level suggests
436 it should contain information about the link (ala lstat).
437 We do our best to fill in what data we can. */
438 if (dir->streamfd != -1)
439 statres = FSTATAT (dir->streamfd, name, &st,
440 AT_SYMLINK_NOFOLLOW);
441 else
442 statres = LSTAT (name, &st);
443 if (statres == 0 && S_ISLNK (st.st_mode))
444 flag = FTW_SLN;
445 else
446 flag = FTW_NS;
447 }
448 }
449 else
450 {
451 if (S_ISDIR (st.st_mode))
452 flag = FTW_D;
453 else if (S_ISLNK (st.st_mode))
454 flag = FTW_SL;
455 else
456 flag = FTW_F;
457 }
458
459 if (result == 0
460 && (flag == FTW_NS
461 || !(data->flags & FTW_MOUNT) || st.st_dev == data->dev))
462 {
463 if (flag == FTW_D)
464 {
465 if ((data->flags & FTW_PHYS)
466 || (!find_object (data, &st)
467 /* Remember the object. */
468 && (result = add_object (data, &st)) == 0))
469 result = ftw_dir (data, &st, dir);
470 }
471 else
472 result = (*data->func) (data->dirbuf, &st, data->cvt_arr[flag],
473 &data->ftw);
474 }
475
476 if ((data->flags & FTW_ACTIONRETVAL) && result == FTW_SKIP_SUBTREE)
477 result = 0;
478
479 return result;
480}
481
482
483static int
484__attribute ((noinline))
485ftw_dir (struct ftw_data *data, struct STRUCT_STAT *st, struct dir_data *old_dir)
486{
487 struct dir_data dir;
488 struct dirent64 *d;
489 int previous_base = data->ftw.base;
490 int result;
491 char *startp;
492
493 /* Open the stream for this directory. This might require that
494 another stream has to be closed. */
495 result = open_dir_stream (old_dir == NULL ? NULL : &old_dir->streamfd,
496 data, &dir);
497 if (result != 0)
498 {
499 if (errno == EACCES)
500 /* We cannot read the directory. Signal this with a special flag. */
501 result = (*data->func) (data->dirbuf, st, FTW_DNR, &data->ftw);
502
503 return result;
504 }
505
506 /* First, report the directory (if not depth-first). */
507 if (!(data->flags & FTW_DEPTH))
508 {
509 result = (*data->func) (data->dirbuf, st, FTW_D, &data->ftw);
510 if (result != 0)
511 {
512 int save_err;
513fail:
514 save_err = errno;
515 __closedir (dir.stream);
516 dir.streamfd = -1;
517 __set_errno (save_err);
518
519 if (data->actdir-- == 0)
520 data->actdir = data->maxdir - 1;
521 data->dirstreams[data->actdir] = NULL;
522 return result;
523 }
524 }
525
526 /* If necessary, change to this directory. */
527 if (data->flags & FTW_CHDIR)
528 {
529 if (__fchdir (__dirfd (dir.stream)) < 0)
530 {
531 result = -1;
532 goto fail;
533 }
534 }
535
536 /* Next, update the `struct FTW' information. */
537 ++data->ftw.level;
538 startp = __rawmemchr (data->dirbuf, '\0');
539 /* There always must be a directory name. */
540 assert (startp != data->dirbuf);
541 if (startp[-1] != '/')
542 *startp++ = '/';
543 data->ftw.base = startp - data->dirbuf;
544
545 while (dir.stream != NULL && (d = __readdir64 (dir.stream)) != NULL)
546 {
547 int d_type = DT_UNKNOWN;
548#ifdef _DIRENT_HAVE_D_TYPE
549 d_type = d->d_type;
550#endif
551 result = process_entry (data, &dir, d->d_name, NAMLEN (d), d_type);
552 if (result != 0)
553 break;
554 }
555
556 if (dir.stream != NULL)
557 {
558 /* The stream is still open. I.e., we did not need more
559 descriptors. Simply close the stream now. */
560 int save_err = errno;
561
562 assert (dir.content == NULL);
563
564 __closedir (dir.stream);
565 dir.streamfd = -1;
566 __set_errno (save_err);
567
568 if (data->actdir-- == 0)
569 data->actdir = data->maxdir - 1;
570 data->dirstreams[data->actdir] = NULL;
571 }
572 else
573 {
574 int save_err;
575 char *runp = dir.content;
576
577 while (result == 0 && *runp != '\0')
578 {
579 char *endp = strchr (runp, '\0');
580
581 // XXX Should store the d_type values as well?!
582 result = process_entry (data, &dir, runp, endp - runp, DT_UNKNOWN);
583
584 runp = endp + 1;
585 }
586
587 save_err = errno;
588 free (dir.content);
589 __set_errno (save_err);
590 }
591
592 if ((data->flags & FTW_ACTIONRETVAL) && result == FTW_SKIP_SIBLINGS)
593 result = 0;
594
595 /* Prepare the return, revert the `struct FTW' information. */
596 data->dirbuf[data->ftw.base - 1] = '\0';
597 --data->ftw.level;
598 data->ftw.base = previous_base;
599
600 /* Finally, if we process depth-first report the directory. */
601 if (result == 0 && (data->flags & FTW_DEPTH))
602 result = (*data->func) (data->dirbuf, st, FTW_DP, &data->ftw);
603
604 if (old_dir
605 && (data->flags & FTW_CHDIR)
606 && (result == 0
607 || ((data->flags & FTW_ACTIONRETVAL)
608 && (result != -1 && result != FTW_STOP))))
609 {
610 /* Change back to the parent directory. */
611 int done = 0;
612 if (old_dir->stream != NULL)
613 if (__fchdir (__dirfd (old_dir->stream)) == 0)
614 done = 1;
615
616 if (!done)
617 {
618 if (data->ftw.base == 1)
619 {
620 if (__chdir ("/") < 0)
621 result = -1;
622 }
623 else
624 if (__chdir ("..") < 0)
625 result = -1;
626 }
627 }
628
629 return result;
630}
631
632
633static int
634__attribute ((noinline))
635ftw_startup (const char *dir, int is_nftw, void *func, int descriptors,
636 int flags)
637{
638 struct ftw_data data = { .dirstreams = NULL };
639 struct STRUCT_STAT st;
640 int result = 0;
641 int save_err;
642 int cwdfd = -1;
643 char *cwd = NULL;
644 char *cp;
645
646 /* First make sure the parameters are reasonable. */
647 if (dir[0] == '\0')
648 {
649 __set_errno (ENOENT);
650 return -1;
651 }
652
653 data.maxdir = descriptors < 1 ? 1 : descriptors;
654 data.actdir = 0;
655 /* PATH_MAX is always defined when we get here. */
656 if (!ftw_allocate (&data, MAX (2 * strlen (dir), PATH_MAX)))
657 return -1;
658 memset (data.dirstreams, '\0', data.maxdir * sizeof (struct dir_data *));
659 cp = __stpcpy (data.dirbuf, dir);
660 /* Strip trailing slashes. */
661 while (cp > data.dirbuf + 1 && cp[-1] == '/')
662 --cp;
663 *cp = '\0';
664
665 data.ftw.level = 0;
666
667 /* Find basename. */
668 while (cp > data.dirbuf && cp[-1] != '/')
669 --cp;
670 data.ftw.base = cp - data.dirbuf;
671
672 data.flags = flags;
673
674 /* This assignment might seem to be strange but it is what we want.
675 The trick is that the first three arguments to the `ftw' and
676 `nftw' callback functions are equal. Therefore we can call in
677 every case the callback using the format of the `nftw' version
678 and get the correct result since the stack layout for a function
679 call in C allows this. */
680 data.func = (NFTW_FUNC_T) func;
681
682 /* Since we internally use the complete set of FTW_* values we need
683 to reduce the value range before calling a `ftw' callback. */
684 data.cvt_arr = is_nftw ? nftw_arr : ftw_arr;
685
686 /* No object known so far. */
687 data.known_objects = NULL;
688
689 /* Now go to the directory containing the initial file/directory. */
690 if (flags & FTW_CHDIR)
691 {
692 /* We have to be able to go back to the current working
693 directory. The best way to do this is to use a file
694 descriptor. */
695 cwdfd = __open (".", O_RDONLY | O_DIRECTORY);
696 if (cwdfd == -1)
697 {
698 /* Try getting the directory name. This can be needed if
699 the current directory is executable but not readable. */
700 if (errno == EACCES)
701 /* GNU extension ahead. */
702 cwd = __getcwd (NULL, 0);
703
704 if (cwd == NULL)
705 goto out_fail;
706 }
707 else if (data.maxdir > 1)
708 /* Account for the file descriptor we use here. */
709 --data.maxdir;
710
711 if (data.ftw.base > 0)
712 {
713 /* Change to the directory the file is in. In data.dirbuf
714 we have a writable copy of the file name. Just NUL
715 terminate it for now and change the directory. */
716 if (data.ftw.base == 1)
717 /* I.e., the file is in the root directory. */
718 result = __chdir ("/");
719 else
720 {
721 char ch = data.dirbuf[data.ftw.base - 1];
722 data.dirbuf[data.ftw.base - 1] = '\0';
723 result = __chdir (data.dirbuf);
724 data.dirbuf[data.ftw.base - 1] = ch;
725 }
726 }
727 }
728
729 /* Get stat info for start directory. */
730 if (result == 0)
731 {
732 const char *name;
733
734 if (data.flags & FTW_CHDIR)
735 {
736 name = data.dirbuf + data.ftw.base;
737 if (name[0] == '\0')
738 name = ".";
739 }
740 else
741 name = data.dirbuf;
742
743 if (((flags & FTW_PHYS)
744 ? LSTAT (name, &st)
745 : STAT (name, &st)) < 0)
746 {
747 if (!(flags & FTW_PHYS)
748 && errno == ENOENT
749 && LSTAT (name, &st) == 0
750 && S_ISLNK (st.st_mode))
751 result = (*data.func) (data.dirbuf, &st, data.cvt_arr[FTW_SLN],
752 &data.ftw);
753 else
754 /* No need to call the callback since we cannot say anything
755 about the object. */
756 result = -1;
757 }
758 else
759 {
760 if (S_ISDIR (st.st_mode))
761 {
762 /* Remember the device of the initial directory in case
763 FTW_MOUNT is given. */
764 data.dev = st.st_dev;
765
766 /* We know this directory now. */
767 if (!(flags & FTW_PHYS))
768 result = add_object (&data, &st);
769
770 if (result == 0)
771 result = ftw_dir (&data, &st, NULL);
772 }
773 else
774 {
775 int flag = S_ISLNK (st.st_mode) ? FTW_SL : FTW_F;
776
777 result = (*data.func) (data.dirbuf, &st, data.cvt_arr[flag],
778 &data.ftw);
779 }
780 }
781
782 if ((flags & FTW_ACTIONRETVAL)
783 && (result == FTW_SKIP_SUBTREE || result == FTW_SKIP_SIBLINGS))
784 result = 0;
785 }
786
787 /* Return to the start directory (if necessary). */
788 if (cwdfd != -1)
789 {
790 int save_err = errno;
791 __fchdir (cwdfd);
792 __close_nocancel_nostatus (cwdfd);
793 __set_errno (save_err);
794 }
795 else if (cwd != NULL)
796 {
797 int save_err = errno;
798 __chdir (cwd);
799 free (cwd);
800 __set_errno (save_err);
801 }
802
803 /* Free all memory. */
804 out_fail:
805 save_err = errno;
806 __tdestroy (data.known_objects, free);
807 free (data.dirstreams);
808 __set_errno (save_err);
809
810 return result;
811}
812
813
814
815/* Entry points. */
816
817int
818FTW_NAME (const char *path, FTW_FUNC_T func, int descriptors)
819{
820 return ftw_startup (path, 0, func, descriptors, 0);
821}
822
823#ifndef NFTW_OLD_NAME
824int
825NFTW_NAME (const char *path, NFTW_FUNC_T func, int descriptors, int flags)
826{
827 return ftw_startup (path, 1, func, descriptors, flags);
828}
829#else
830
831# include <shlib-compat.h>
832
833int NFTW_NEW_NAME (const char *, NFTW_FUNC_T, int, int);
834
835int
836NFTW_NEW_NAME (const char *path, NFTW_FUNC_T func, int descriptors, int flags)
837{
838 if (flags
839 & ~(FTW_PHYS | FTW_MOUNT | FTW_CHDIR | FTW_DEPTH | FTW_ACTIONRETVAL))
840 {
841 __set_errno (EINVAL);
842 return -1;
843 }
844 return ftw_startup (path, 1, func, descriptors, flags);
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 /* NFTW_OLD_NAME */
865

source code of glibc/io/ftw.c