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