io/ftw.c

   1 /* File tree walker functions.
   2    Copyright (C) 1996-2003, 2004, 2006 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, write to the Free
  18    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19    02111-1307 USA.  */
  20
  21 #ifdef HAVE_CONFIG_H
  22 # include <config.h>
  23 #endif
  24
  25 #if __GNUC__
  26 # define alloca __builtin_alloca
  27 #else
  28 # if HAVE_ALLOCA_H
  29 #  include <alloca.h>
  30 # else
  31 #  ifdef _AIX
  32  #  pragma alloca
  33 #  else
  34 char *alloca ();
  35 #  endif
  36 # endif
  37 #endif
  38
  39 #ifdef _LIBC
  40 # include <dirent.h>
  41 # define NAMLEN(dirent) _D_EXACT_NAMLEN (dirent)
  42 #else
  43 # if HAVE_DIRENT_H
  44 #  include <dirent.h>
  45 #  define NAMLEN(dirent) strlen ((dirent)->d_name)
  46 # else
  47 #  define dirent direct
  48 #  define NAMLEN(dirent) (dirent)->d_namlen
  49 #  if HAVE_SYS_NDIR_H
  50 #   include <sys/ndir.h>
  51 #  endif
  52 #  if HAVE_SYS_DIR_H
  53 #   include <sys/dir.h>
  54 #  endif
  55 #  if HAVE_NDIR_H
  56 #   include <ndir.h>
  57 #  endif
  58 # endif
  59 #endif
  60
  61 #include <errno.h>
  62 #include <fcntl.h>
  63 #include <ftw.h>
  64 #include <limits.h>
  65 #include <search.h>
  66 #include <stdlib.h>
  67 #include <string.h>
  68 #include <unistd.h>
  69 #include <not-cancel.h>
  70 #if HAVE_SYS_PARAM_H || defined _LIBC
  71 # include <sys/param.h>
  72 #endif
  73 #ifdef _LIBC
  74 # include <include/sys/stat.h>
  75 #else
  76 # include <sys/stat.h>
  77 #endif
  78
  79 #if ! _LIBC && !HAVE_DECL_STPCPY && !defined stpcpy
  80 char *stpcpy ();
  81 #endif
  82
  83 #if ! _LIBC && ! defined HAVE_MEMPCPY && ! defined mempcpy
  84 /* Be CAREFUL that there are no side effects in N.  */
  85 # define mempcpy(D, S, N) ((void *) ((char *) memcpy (D, S, N) + (N)))
  86 #endif
  87
  88 /* #define NDEBUG 1 */
  89 #include <assert.h>
  90
  91 #ifndef _LIBC
  92 # undef __chdir
  93 # define __chdir chdir
  94 # undef __closedir
  95 # define __closedir closedir
  96 # undef __fchdir
  97 # define __fchdir fchdir
  98 # undef __getcwd
  99 # define __getcwd(P, N) xgetcwd ()
 100 extern char *xgetcwd (void);
 101 # undef __mempcpy
 102 # define __mempcpy mempcpy
 103 # undef __opendir
 104 # define __opendir opendir
 105 # undef __readdir64
 106 # define __readdir64 readdir
 107 # undef __stpcpy
 108 # define __stpcpy stpcpy
 109 # undef __tdestroy
 110 # define __tdestroy tdestroy
 111 # undef __tfind
 112 # define __tfind tfind
 113 # undef __tsearch
 114 # define __tsearch tsearch
 115 # undef internal_function
 116 # define internal_function /* empty */
 117 # undef dirent64
 118 # define dirent64 dirent
 119 # undef MAX
 120 # define MAX(a, b) ((a) > (b) ? (a) : (b))
 121 #endif
 122
 123 /* Arrange to make lstat calls go through the wrapper function
 124    on systems with an lstat function that does not dereference symlinks
 125    that are specified with a trailing slash.  */
 126 #if ! _LIBC && ! LSTAT_FOLLOWS_SLASHED_SYMLINK
 127 int rpl_lstat (const char *, struct stat *);
 128 # undef lstat
 129 # define lstat(Name, Stat_buf) rpl_lstat(Name, Stat_buf)
 130 #endif
 131
 132 #ifndef __set_errno
 133 # define __set_errno(Val) errno = (Val)
 134 #endif
 135
 136 /* Support for the LFS API version.  */
 137 #ifndef FTW_NAME
 138 # define FTW_NAME ftw
 139 # define NFTW_NAME nftw
 140 # define NFTW_OLD_NAME __old_nftw
 141 # define NFTW_NEW_NAME __new_nftw
 142 # define INO_T ino_t
 143 # define STAT stat
 144 # ifdef _LIBC
 145 #  define LXSTAT __lxstat
 146 #  define XSTAT __xstat
 147 #  define FXSTATAT __fxstatat
 148 # else
 149 #  define LXSTAT(V,f,sb) lstat (f,sb)
 150 #  define XSTAT(V,f,sb) stat (f,sb)
 151 #  define FXSTATAT(V,d,f,sb,m) fstatat (d, f, sb, m)
 152 # endif
 153 # define FTW_FUNC_T __ftw_func_t
 154 # define NFTW_FUNC_T __nftw_func_t
 155 #endif
 156
 157 /* We define PATH_MAX if the system does not provide a definition.
 158    This does not artificially limit any operation.  PATH_MAX is simply
 159    used as a guesstimate for the expected maximal path length.
 160    Buffers will be enlarged if necessary.  */
 161 #ifndef PATH_MAX
 162 # define PATH_MAX 1024
 163 #endif
 164
 165 struct dir_data
 166 {
 167   DIR *stream;
 168   int streamfd;
 169   char *content;
 170 };
 171
 172 struct known_object
 173 {
 174   dev_t dev;
 175   INO_T ino;
 176 };
 177
 178 struct ftw_data
 179 {
 180   /* Array with pointers to open directory streams.  */
 181   struct dir_data **dirstreams;
 182   size_t actdir;
 183   size_t maxdir;
 184
 185   /* Buffer containing name of currently processed object.  */
 186   char *dirbuf;
 187   size_t dirbufsize;
 188
 189   /* Passed as fourth argument to `nftw' callback.  The `base' member
 190      tracks the content of the `dirbuf'.  */
 191   struct FTW ftw;
 192
 193   /* Flags passed to `nftw' function.  0 for `ftw'.  */
 194   int flags;
 195
 196   /* Conversion array for flag values.  It is the identity mapping for
 197      `nftw' calls, otherwise it maps the values to those known by
 198      `ftw'.  */
 199   const int *cvt_arr;
 200
 201   /* Callback function.  We always use the `nftw' form.  */
 202   NFTW_FUNC_T func;
 203
 204   /* Device of starting point.  Needed for FTW_MOUNT.  */
 205   dev_t dev;
 206
 207   /* Data structure for keeping fingerprints of already processed
 208      object.  This is needed when not using FTW_PHYS.  */
 209   void *known_objects;
 210 };
 211
 212
 213 /* Internally we use the FTW_* constants used for `nftw'.  When invoked
 214    as `ftw', map each flag to the subset of values used by `ftw'.  */
 215 static const int nftw_arr[] =
 216 {
 217   FTW_F, FTW_D, FTW_DNR, FTW_NS, FTW_SL, FTW_DP, FTW_SLN
 218 };
 219
 220 static const int ftw_arr[] =
 221 {
 222   FTW_F, FTW_D, FTW_DNR, FTW_NS, FTW_F, FTW_D, FTW_NS
 223 };
 224
 225
 226 /* Forward declarations of local functions.  */
 227 static int ftw_dir (struct ftw_data *data, struct STAT *st,
 228                     struct dir_data *old_dir) internal_function;
 229
 230
 231 static int
 232 object_compare (const void *p1, const void *p2)
 233 {
 234   /* We don't need a sophisticated and useful comparison.  We are only
 235      interested in equality.  However, we must be careful not to
 236      accidentally compare `holes' in the structure.  */
 237   const struct known_object *kp1 = p1, *kp2 = p2;
 238   int cmp1;
 239   cmp1 = (kp1->ino > kp2->ino) - (kp1->ino < kp2->ino);
 240   if (cmp1 != 0)
 241     return cmp1;
 242   return (kp1->dev > kp2->dev) - (kp1->dev < kp2->dev);
 243 }
 244
 245
 246 static inline int
 247 add_object (struct ftw_data *data, struct STAT *st)
 248 {
 249   struct known_object *newp = malloc (sizeof (struct known_object));
 250   if (newp == NULL)
 251     return -1;
 252   newp->dev = st->st_dev;
 253   newp->ino = st->st_ino;
 254   return __tsearch (newp, &data->known_objects, object_compare) ? 0 : -1;
 255 }
 256
 257
 258 static inline int
 259 find_object (struct ftw_data *data, struct STAT *st)
 260 {
 261   struct known_object obj;
 262   obj.dev = st->st_dev;
 263   obj.ino = st->st_ino;
 264   return __tfind (&obj, &data->known_objects, object_compare) != NULL;
 265 }
 266
 267
 268 static inline int
 269 __attribute ((always_inline))
 270 open_dir_stream (int *dfdp, struct ftw_data *data, struct dir_data *dirp)
 271 {
 272   int result = 0;
 273
 274   if (data->dirstreams[data->actdir] != NULL)
 275     {
 276       /* Oh, oh.  We must close this stream.  Get all remaining
 277          entries and store them as a list in the `content' member of
 278          the `struct dir_data' variable.  */
 279       size_t bufsize = 1024;
 280       char *buf = malloc (bufsize);
 281
 282       if (buf == NULL)
 283         result = -1;
 284       else
 285         {
 286           DIR *st = data->dirstreams[data->actdir]->stream;
 287           struct dirent64 *d;
 288           size_t actsize = 0;
 289
 290           while ((d = __readdir64 (st)) != NULL)
 291             {
 292               size_t this_len = NAMLEN (d);
 293               if (actsize + this_len + 2 >= bufsize)
 294                 {
 295                   char *newp;
 296                   bufsize += MAX (1024, 2 * this_len);
 297                   newp = (char *) realloc (buf, bufsize);
 298                   if (newp == NULL)
 299                     {
 300                       /* No more memory.  */
 301                       int save_err = errno;
 302                       free (buf);
 303                       __set_errno (save_err);
 304                       result = -1;
 305                       break;
 306                     }
 307                   buf = newp;
 308                 }
 309
 310               *((char *) __mempcpy (buf + actsize, d->d_name, this_len))
 311                 = '\0';
 312               actsize += this_len + 1;
 313             }
 314
 315           /* Terminate the list with an additional NUL byte.  */
 316           buf[actsize++] = '\0';
 317
 318           /* Shrink the buffer to what we actually need.  */
 319           data->dirstreams[data->actdir]->content = realloc (buf, actsize);
 320           if (data->dirstreams[data->actdir]->content == NULL)
 321             {
 322               int save_err = errno;
 323               free (buf);
 324               __set_errno (save_err);
 325               result = -1;
 326             }
 327           else
 328             {
 329               __closedir (st);
 330               data->dirstreams[data->actdir]->stream = NULL;
 331               data->dirstreams[data->actdir]->streamfd = -1;
 332               data->dirstreams[data->actdir] = NULL;
 333             }
 334         }
 335     }
 336
 337   /* Open the new stream.  */
 338   if (result == 0)
 339     {
 340       assert (data->dirstreams[data->actdir] == NULL);
 341
 342       if (dfdp != NULL && *dfdp != -1)
 343         {
 344           int fd = openat64_not_cancel_3 (*dfdp, data->dirbuf + data->ftw.base,
 345                                           O_RDONLY | O_DIRECTORY | O_NDELAY);
 346           dirp->stream = NULL;
 347           if (fd != -1 && (dirp->stream = __fdopendir (fd)) == NULL)
 348             close_not_cancel_no_status (fd);
 349         }
 350       else
 351         {
 352           const char *name = ((data->flags & FTW_CHDIR)
 353                               ? data->dirbuf + data->ftw.base: data->dirbuf);
 354           dirp->stream = __opendir (name);
 355         }
 356
 357       if (dirp->stream == NULL)
 358         result = -1;
 359       else
 360         {
 361           dirp->streamfd = dirfd (dirp->stream);
 362           dirp->content = NULL;
 363           data->dirstreams[data->actdir] = dirp;
 364
 365           if (++data->actdir == data->maxdir)
 366             data->actdir = 0;
 367         }
 368     }
 369
 370   return result;
 371 }
 372
 373
 374 static int
 375 internal_function
 376 process_entry (struct ftw_data *data, struct dir_data *dir, const char *name,
 377                size_t namlen, int d_type)
 378 {
 379   struct STAT st;
 380   int result = 0;
 381   int flag = 0;
 382   size_t new_buflen;
 383
 384   if (name[0] == '.' && (name[1] == '\0'
 385                          || (name[1] == '.' && name[2] == '\0')))
 386     /* Don't process the "." and ".." entries.  */
 387     return 0;
 388
 389   new_buflen = data->ftw.base + namlen + 2;
 390   if (data->dirbufsize < new_buflen)
 391     {
 392       /* Enlarge the buffer.  */
 393       char *newp;
 394
 395       data->dirbufsize = 2 * new_buflen;
 396       newp = (char *) realloc (data->dirbuf, data->dirbufsize);
 397       if (newp == NULL)
 398         return -1;
 399       data->dirbuf = newp;
 400     }
 401
 402   *((char *) __mempcpy (data->dirbuf + data->ftw.base, name, namlen)) = '\0';
 403
 404   int statres;
 405   if (dir->streamfd != -1)
 406     statres = FXSTATAT (_STAT_VER, dir->streamfd, name, &st,
 407                         (data->flags & FTW_PHYS) ? AT_SYMLINK_NOFOLLOW : 0);
 408   else
 409     {
 410       if ((data->flags & FTW_CHDIR) == 0)
 411         name = data->dirbuf;
 412
 413       statres = ((data->flags & FTW_PHYS)
 414                  ? LXSTAT (_STAT_VER, name, &st)
 415                  : XSTAT (_STAT_VER, name, &st));
 416     }
 417
 418   if (statres < 0)
 419     {
 420       if (errno != EACCES && errno != ENOENT)
 421         result = -1;
 422       else if (!(data->flags & FTW_PHYS)
 423                && (d_type == DT_LNK
 424                    || (LXSTAT (_STAT_VER, name, &st) == 0
 425                        && S_ISLNK (st.st_mode))))
 426         flag = FTW_SLN;
 427       else
 428         flag = FTW_NS;
 429     }
 430   else
 431     {
 432       if (S_ISDIR (st.st_mode))
 433         flag = FTW_D;
 434       else if (S_ISLNK (st.st_mode))
 435         flag = FTW_SL;
 436       else
 437         flag = FTW_F;
 438     }
 439
 440   if (result == 0
 441       && (flag == FTW_NS
 442           || !(data->flags & FTW_MOUNT) || st.st_dev == data->dev))
 443     {
 444       if (flag == FTW_D)
 445         {
 446           if ((data->flags & FTW_PHYS)
 447               || (!find_object (data, &st)
 448                   /* Remember the object.  */
 449                   && (result = add_object (data, &st)) == 0))
 450             result = ftw_dir (data, &st, dir);
 451         }
 452       else
 453         result = (*data->func) (data->dirbuf, &st, data->cvt_arr[flag],
 454                                 &data->ftw);
 455     }
 456
 457   if ((data->flags & FTW_ACTIONRETVAL) && result == FTW_SKIP_SUBTREE)
 458     result = 0;
 459
 460   return result;
 461 }
 462
 463
 464 static int
 465 __attribute ((noinline))
 466 internal_function
 467 ftw_dir (struct ftw_data *data, struct STAT *st, struct dir_data *old_dir)
 468 {
 469   struct dir_data dir;
 470   struct dirent64 *d;
 471   int previous_base = data->ftw.base;
 472   int result;
 473   char *startp;
 474
 475   /* Open the stream for this directory.  This might require that
 476      another stream has to be closed.  */
 477   result = open_dir_stream (old_dir == NULL ? NULL : &old_dir->streamfd,
 478                             data, &dir);
 479   if (result != 0)
 480     {
 481       if (errno == EACCES)
 482         /* We cannot read the directory.  Signal this with a special flag.  */
 483         result = (*data->func) (data->dirbuf, st, FTW_DNR, &data->ftw);
 484
 485       return result;
 486     }
 487
 488   /* First, report the directory (if not depth-first).  */
 489   if (!(data->flags & FTW_DEPTH))
 490     {
 491       result = (*data->func) (data->dirbuf, st, FTW_D, &data->ftw);
 492       if (result != 0)
 493         {
 494           int save_err;
 495 fail:
 496           save_err = errno;
 497           __closedir (dir.stream);
 498           dir.streamfd = -1;
 499           __set_errno (save_err);
 500
 501           if (data->actdir-- == 0)
 502             data->actdir = data->maxdir - 1;
 503           data->dirstreams[data->actdir] = NULL;
 504           return result;
 505         }
 506     }
 507
 508   /* If necessary, change to this directory.  */
 509   if (data->flags & FTW_CHDIR)
 510     {
 511       if (__fchdir (dirfd (dir.stream)) < 0)
 512         {
 513           result = -1;
 514           goto fail;
 515         }
 516     }
 517
 518   /* Next, update the `struct FTW' information.  */
 519   ++data->ftw.level;
 520   startp = strchr (data->dirbuf, '\0');
 521   /* There always must be a directory name.  */
 522   assert (startp != data->dirbuf);
 523   if (startp[-1] != '/')
 524     *startp++ = '/';
 525   data->ftw.base = startp - data->dirbuf;
 526
 527   while (dir.stream != NULL && (d = __readdir64 (dir.stream)) != NULL)
 528     {
 529       result = process_entry (data, &dir, d->d_name, NAMLEN (d), d->d_type);
 530       if (result != 0)
 531         break;
 532     }
 533
 534   if (dir.stream != NULL)
 535     {
 536       /* The stream is still open.  I.e., we did not need more
 537          descriptors.  Simply close the stream now.  */
 538       int save_err = errno;
 539
 540       assert (dir.content == NULL);
 541
 542       __closedir (dir.stream);
 543       dir.streamfd = -1;
 544       __set_errno (save_err);
 545
 546       if (data->actdir-- == 0)
 547         data->actdir = data->maxdir - 1;
 548       data->dirstreams[data->actdir] = NULL;
 549     }
 550   else
 551     {
 552       int save_err;
 553       char *runp = dir.content;
 554
 555       while (result == 0 && *runp != '\0')
 556         {
 557           char *endp = strchr (runp, '\0');
 558
 559           // XXX Should store the d_type values as well?!
 560           result = process_entry (data, &dir, runp, endp - runp, DT_UNKNOWN);
 561
 562           runp = endp + 1;
 563         }
 564
 565       save_err = errno;
 566       free (dir.content);
 567       __set_errno (save_err);
 568     }
 569
 570   if ((data->flags & FTW_ACTIONRETVAL) && result == FTW_SKIP_SIBLINGS)
 571     result = 0;
 572
 573   /* Prepare the return, revert the `struct FTW' information.  */
 574   data->dirbuf[data->ftw.base - 1] = '\0';
 575   --data->ftw.level;
 576   data->ftw.base = previous_base;
 577
 578   /* Finally, if we process depth-first report the directory.  */
 579   if (result == 0 && (data->flags & FTW_DEPTH))
 580     result = (*data->func) (data->dirbuf, st, FTW_DP, &data->ftw);
 581
 582   if (old_dir
 583       && (data->flags & FTW_CHDIR)
 584       && (result == 0
 585           || ((data->flags & FTW_ACTIONRETVAL)
 586               && (result != -1 && result != FTW_STOP))))
 587     {
 588       /* Change back to the parent directory.  */
 589       int done = 0;
 590       if (old_dir->stream != NULL)
 591         if (__fchdir (dirfd (old_dir->stream)) == 0)
 592           done = 1;
 593
 594       if (!done)
 595         {
 596           if (data->ftw.base == 1)
 597             {
 598               if (__chdir ("/") < 0)
 599                 result = -1;
 600             }
 601           else
 602             if (__chdir ("..") < 0)
 603               result = -1;
 604         }
 605     }
 606
 607   return result;
 608 }
 609
 610
 611 static int
 612 __attribute ((noinline))
 613 internal_function
 614 ftw_startup (const char *dir, int is_nftw, void *func, int descriptors,
 615              int flags)
 616 {
 617   struct ftw_data data;
 618   struct STAT st;
 619   int result = 0;
 620   int save_err;
 621   int cwdfd = -1;
 622   char *cwd = NULL;
 623   char *cp;
 624
 625   /* First make sure the parameters are reasonable.  */
 626   if (dir[0] == '\0')
 627     {
 628       __set_errno (ENOENT);
 629       return -1;
 630     }
 631
 632   data.maxdir = descriptors < 1 ? 1 : descriptors;
 633   data.actdir = 0;
 634   data.dirstreams = (struct dir_data **) alloca (data.maxdir
 635                                                  * sizeof (struct dir_data *));
 636   memset (data.dirstreams, '\0', data.maxdir * sizeof (struct dir_data *));
 637
 638   /* PATH_MAX is always defined when we get here.  */
 639   data.dirbufsize = MAX (2 * strlen (dir), PATH_MAX);
 640   data.dirbuf = (char *) malloc (data.dirbufsize);
 641   if (data.dirbuf == NULL)
 642     return -1;
 643   cp = __stpcpy (data.dirbuf, dir);
 644   /* Strip trailing slashes.  */
 645   while (cp > data.dirbuf + 1 && cp[-1] == '/')
 646     --cp;
 647   *cp = '\0';
 648
 649   data.ftw.level = 0;
 650
 651   /* Find basename.  */
 652   while (cp > data.dirbuf && cp[-1] != '/')
 653     --cp;
 654   data.ftw.base = cp - data.dirbuf;
 655
 656   data.flags = flags;
 657
 658   /* This assignment might seem to be strange but it is what we want.
 659      The trick is that the first three arguments to the `ftw' and
 660      `nftw' callback functions are equal.  Therefore we can call in
 661      every case the callback using the format of the `nftw' version
 662      and get the correct result since the stack layout for a function
 663      call in C allows this.  */
 664   data.func = (NFTW_FUNC_T) func;
 665
 666   /* Since we internally use the complete set of FTW_* values we need
 667      to reduce the value range before calling a `ftw' callback.  */
 668   data.cvt_arr = is_nftw ? nftw_arr : ftw_arr;
 669
 670   /* No object known so far.  */
 671   data.known_objects = NULL;
 672
 673   /* Now go to the directory containing the initial file/directory.  */
 674   if (flags & FTW_CHDIR)
 675     {
 676       /* We have to be able to go back to the current working
 677          directory.  The best way to do this is to use a file
 678          descriptor.  */
 679       cwdfd = __open (".", O_RDONLY | O_DIRECTORY);
 680       if (cwdfd == -1)
 681         {
 682           /* Try getting the directory name.  This can be needed if
 683              the current directory is executable but not readable.  */
 684           if (errno == EACCES)
 685             /* GNU extension ahead.  */
 686             cwd =  __getcwd (NULL, 0);
 687
 688           if (cwd == NULL)
 689             goto out_fail;
 690         }
 691       else if (data.maxdir > 1)
 692         /* Account for the file descriptor we use here.  */
 693         --data.maxdir;
 694
 695       if (data.ftw.base > 0)
 696         {
 697           /* Change to the directory the file is in.  In data.dirbuf
 698              we have a writable copy of the file name.  Just NUL
 699              terminate it for now and change the directory.  */
 700           if (data.ftw.base == 1)
 701             /* I.e., the file is in the root directory.  */
 702             result = __chdir ("/");
 703           else
 704             {
 705               char ch = data.dirbuf[data.ftw.base - 1];
 706               data.dirbuf[data.ftw.base - 1] = '\0';
 707               result = __chdir (data.dirbuf);
 708               data.dirbuf[data.ftw.base - 1] = ch;
 709             }
 710         }
 711     }
 712
 713   /* Get stat info for start directory.  */
 714   if (result == 0)
 715     {
 716       const char *name = ((data.flags & FTW_CHDIR)
 717                           ? data.dirbuf + data.ftw.base
 718                           : data.dirbuf);
 719
 720       if (((flags & FTW_PHYS)
 721            ? LXSTAT (_STAT_VER, name, &st)
 722            : XSTAT (_STAT_VER, name, &st)) < 0)
 723         {
 724           if (!(flags & FTW_PHYS)
 725               && errno == ENOENT
 726               && LXSTAT (_STAT_VER, name, &st) == 0
 727               && S_ISLNK (st.st_mode))
 728             result = (*data.func) (data.dirbuf, &st, data.cvt_arr[FTW_SLN],
 729                                    &data.ftw);
 730           else
 731             /* No need to call the callback since we cannot say anything
 732                about the object.  */
 733             result = -1;
 734         }
 735       else
 736         {
 737           if (S_ISDIR (st.st_mode))
 738             {
 739               /* Remember the device of the initial directory in case
 740                  FTW_MOUNT is given.  */
 741               data.dev = st.st_dev;
 742
 743               /* We know this directory now.  */
 744               if (!(flags & FTW_PHYS))
 745                 result = add_object (&data, &st);
 746
 747               if (result == 0)
 748                 result = ftw_dir (&data, &st, NULL);
 749             }
 750           else
 751             {
 752               int flag = S_ISLNK (st.st_mode) ? FTW_SL : FTW_F;
 753
 754               result = (*data.func) (data.dirbuf, &st, data.cvt_arr[flag],
 755                                      &data.ftw);
 756             }
 757         }
 758
 759       if ((flags & FTW_ACTIONRETVAL)
 760           && (result == FTW_SKIP_SUBTREE || result == FTW_SKIP_SIBLINGS))
 761         result = 0;
 762     }
 763
 764   /* Return to the start directory (if necessary).  */
 765   if (cwdfd != -1)
 766     {
 767       int save_err = errno;
 768       __fchdir (cwdfd);
 769       __set_errno (save_err);
 770     }
 771   else if (cwd != NULL)
 772     {
 773       int save_err = errno;
 774       __chdir (cwd);
 775       free (cwd);
 776       __set_errno (save_err);
 777     }
 778
 779   /* Free all memory.  */
 780  out_fail:
 781   save_err = errno;
 782   __tdestroy (data.known_objects, free);
 783   free (data.dirbuf);
 784   __set_errno (save_err);
 785
 786   return result;
 787 }
 788
 789
 790
 791 /* Entry points.  */
 792
 793 int
 794 FTW_NAME (path, func, descriptors)
 795      const char *path;
 796      FTW_FUNC_T func;
 797      int descriptors;
 798 {
 799   return ftw_startup (path, 0, func, descriptors, 0);
 800 }
 801
 802 #ifndef _LIBC
 803 int
 804 NFTW_NAME (path, func, descriptors, flags)
 805      const char *path;
 806      NFTW_FUNC_T func;
 807      int descriptors;
 808      int flags;
 809 {
 810   return ftw_startup (path, 1, func, descriptors, flags);
 811 }
 812 #else
 813
 814 # include <shlib-compat.h>
 815
 816 int NFTW_NEW_NAME (const char *, NFTW_FUNC_T, int, int);
 817
 818 int
 819 NFTW_NEW_NAME (path, func, descriptors, flags)
 820      const char *path;
 821      NFTW_FUNC_T func;
 822      int descriptors;
 823      int flags;
 824 {
 825   if (flags
 826       & ~(FTW_PHYS | FTW_MOUNT | FTW_CHDIR | FTW_DEPTH | FTW_ACTIONRETVAL))
 827     {
 828       __set_errno (EINVAL);
 829       return -1;
 830     }
 831   return ftw_startup (path, 1, func, descriptors, flags);
 832 }
 833
 834 versioned_symbol (libc, NFTW_NEW_NAME, NFTW_NAME, GLIBC_2_3_3);
 835
 836 # if SHLIB_COMPAT(libc, GLIBC_2_1, GLIBC_2_3_3)
 837
 838 /* Older nftw* version just ignored all unknown flags.  */
 839
 840 int NFTW_OLD_NAME (const char *, NFTW_FUNC_T, int, int);
 841
 842 int
 843 attribute_compat_text_section
 844 NFTW_OLD_NAME (path, func, descriptors, flags)
 845      const char *path;
 846      NFTW_FUNC_T func;
 847      int descriptors;
 848      int flags;
 849 {
 850   flags &= (FTW_PHYS | FTW_MOUNT | FTW_CHDIR | FTW_DEPTH);
 851   return ftw_startup (path, 1, func, descriptors, flags);
 852 }
 853
 854 compat_symbol (libc, NFTW_OLD_NAME, NFTW_NAME, GLIBC_2_1);
 855 # endif
 856 #endif