libc/misc/ftw/ftw.c

   1 /* File tree walker functions.
   2    Copyright (C) 1996-2003, 2004 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 #include <features.h>
  25 /* need errno.h before undefining _LIBC */
  26 #include <errno.h>
  27 #ifdef __UCLIBC__
  28 #undef _LIBC
  29 #define HAVE_DIRENT_H 1
  30 #define HAVE_SYS_PARAM_H 1
  31 #define HAVE_DECL_STPCPY 1
  32 #define HAVE_MEMPCPY 1
  33 #endif
  34
  35 #if __GNUC__
  36 # undef alloca
  37 # define alloca __builtin_alloca
  38 #else
  39 # if HAVE_ALLOCA_H
  40 #  include <alloca.h>
  41 # else
  42 #  ifdef _AIX
  43  #  pragma alloca
  44 #  else
  45 char *alloca ();
  46 #  endif
  47 # endif
  48 #endif
  49
  50 #if defined _LIBC
  51 # include <dirent.h>
  52 # define NAMLEN(dirent) _D_EXACT_NAMLEN (dirent)
  53 #else
  54 # if HAVE_DIRENT_H
  55 #  include <dirent.h>
  56 #  define NAMLEN(dirent) strlen ((dirent)->d_name)
  57 # else
  58 #  define dirent direct
  59 #  define NAMLEN(dirent) (dirent)->d_namlen
  60 #  if HAVE_SYS_NDIR_H
  61 #   include <sys/ndir.h>
  62 #  endif
  63 #  if HAVE_SYS_DIR_H
  64 #   include <sys/dir.h>
  65 #  endif
  66 #  if HAVE_NDIR_H
  67 #   include <ndir.h>
  68 #  endif
  69 # endif
  70 #endif
  71
  72 #include <ftw.h>
  73 #include <limits.h>
  74 #include <search.h>
  75 #include <stdlib.h>
  76 #include <string.h>
  77 #include <unistd.h>
  78 #if HAVE_SYS_PARAM_H || defined _LIBC
  79 # include <sys/param.h>
  80 #endif
  81 #include <sys/stat.h>
  82
  83 #if !defined _LIBC && !HAVE_DECL_STPCPY && !defined stpcpy
  84 char *stpcpy ();
  85 #endif
  86
  87 #if !defined _LIBC && ! defined HAVE_MEMPCPY && ! defined mempcpy
  88 /* Be CAREFUL that there are no side effects in N.  */
  89 # define mempcpy(D, S, N) ((void *) ((char *) memcpy (D, S, N) + (N)))
  90 #endif
  91
  92 /* #define NDEBUG 1 */
  93 #include <assert.h>
  94
  95 #if !defined _LIBC
  96 # undef __chdir
  97 # define __chdir chdir
  98 # undef __closedir
  99 # define __closedir closedir
 100 # undef __fchdir
 101 # define __fchdir fchdir
 102 # undef __getcwd
 103 # ifndef __UCLIBC__
 104 # define __getcwd(P, N) xgetcwd ()
 105 extern char *xgetcwd (void);
 106 # else
 107 # define __getcwd getcwd
 108 # endif
 109 # undef __mempcpy
 110 # define __mempcpy mempcpy
 111 # undef __opendir
 112 # define __opendir opendir
 113 # undef __readdir64
 114 # define __readdir64 readdir64
 115 # undef __stpcpy
 116 # define __stpcpy stpcpy
 117 # undef __tdestroy
 118 # define __tdestroy tdestroy
 119 # undef __tfind
 120 # define __tfind tfind
 121 # undef __tsearch
 122 # define __tsearch tsearch
 123 # undef internal_function
 124 # define internal_function /* empty */
 125 # undef MAX
 126 # define MAX(a, b) ((a) > (b) ? (a) : (b))
 127 #endif
 128
 129 /* Arrange to make lstat calls go through the wrapper function
 130    on systems with an lstat function that does not dereference symlinks
 131    that are specified with a trailing slash.  */
 132 #if !defined _LIBC && !defined LSTAT_FOLLOWS_SLASHED_SYMLINK && !defined __UCLIBC__
 133 int rpl_lstat (const char *, struct stat *);
 134 # undef lstat
 135 # define lstat(Name, Stat_buf) rpl_lstat(Name, Stat_buf)
 136 #endif
 137
 138 #ifndef __set_errno
 139 # define __set_errno(Val) errno = (Val)
 140 #endif
 141
 142 /* Support for the LFS API version.  */
 143 #ifndef FTW_NAME
 144 # define FTW_NAME ftw
 145 # define NFTW_NAME nftw
 146 # define NFTW_OLD_NAME __old_nftw
 147 # define NFTW_NEW_NAME __new_nftw
 148 # define INO_T ino_t
 149 # define STAT stat
 150 # ifdef _LIBC
 151 #  define LXSTAT __lxstat
 152 #  define XSTAT __xstat
 153 # else
 154 #  define LXSTAT(V,f,sb) lstat (f,sb)
 155 #  define XSTAT(V,f,sb) stat (f,sb)
 156 # endif
 157 # define FTW_FUNC_T __ftw_func_t
 158 # define NFTW_FUNC_T __nftw_func_t
 159 #endif
 160
 161 /* We define PATH_MAX if the system does not provide a definition.
 162    This does not artificially limit any operation.  PATH_MAX is simply
 163    used as a guesstimate for the expected maximal path length.
 164    Buffers will be enlarged if necessary.  */
 165 #ifndef PATH_MAX
 166 # define PATH_MAX 1024
 167 #endif
 168
 169 struct dir_data
 170 {
 171   DIR *stream;
 172   char *content;
 173 };
 174
 175 struct known_object
 176 {
 177   dev_t dev;
 178   INO_T ino;
 179 };
 180
 181 struct ftw_data
 182 {
 183   /* Array with pointers to open directory streams.  */
 184   struct dir_data **dirstreams;
 185   size_t actdir;
 186   size_t maxdir;
 187
 188   /* Buffer containing name of currently processed object.  */
 189   char *dirbuf;
 190   size_t dirbufsize;
 191
 192   /* Passed as fourth argument to `nftw' callback.  The `base' member
 193      tracks the content of the `dirbuf'.  */
 194   struct FTW ftw;
 195
 196   /* Flags passed to `nftw' function.  0 for `ftw'.  */
 197   int flags;
 198
 199   /* Conversion array for flag values.  It is the identity mapping for
 200      `nftw' calls, otherwise it maps the values to those known by
 201      `ftw'.  */
 202   const int *cvt_arr;
 203
 204   /* Callback function.  We always use the `nftw' form.  */
 205   NFTW_FUNC_T func;
 206
 207   /* Device of starting point.  Needed for FTW_MOUNT.  */
 208   dev_t dev;
 209
 210   /* Data structure for keeping fingerprints of already processed
 211      object.  This is needed when not using FTW_PHYS.  */
 212   void *known_objects;
 213 };
 214
 215
 216 /* Internally we use the FTW_* constants used for `nftw'.  When invoked
 217    as `ftw', map each flag to the subset of values used by `ftw'.  */
 218 static const int nftw_arr[] =
 219 {
 220   FTW_F, FTW_D, FTW_DNR, FTW_NS, FTW_SL, FTW_DP, FTW_SLN
 221 };
 222
 223 static const int ftw_arr[] =
 224 {
 225   FTW_F, FTW_D, FTW_DNR, FTW_NS, FTW_F, FTW_D, FTW_NS
 226 };
 227
 228
 229 /* Forward declarations of local functions.  */
 230 static int ftw_dir (struct ftw_data *data, struct STAT *st,
 231                     struct dir_data *old_dir) internal_function;
 232
 233
 234 static int
 235 object_compare (const void *p1, const void *p2)
 236 {
 237   /* We don't need a sophisticated and useful comparison.  We are only
 238      interested in equality.  However, we must be careful not to
 239      accidentally compare `holes' in the structure.  */
 240   const struct known_object *kp1 = p1, *kp2 = p2;
 241   int cmp1;
 242   cmp1 = (kp1->ino > kp2->ino) - (kp1->ino < kp2->ino);
 243   if (cmp1 != 0)
 244     return cmp1;
 245   return (kp1->dev > kp2->dev) - (kp1->dev < kp2->dev);
 246 }
 247
 248
 249 static __inline__ int
 250 add_object (struct ftw_data *data, struct STAT *st)
 251 {
 252   struct known_object *newp = malloc (sizeof (struct known_object));
 253   if (newp == NULL)
 254     return -1;
 255   newp->dev = st->st_dev;
 256   newp->ino = st->st_ino;
 257   return __tsearch (newp, &data->known_objects, object_compare) ? 0 : -1;
 258 }
 259
 260
 261 static __inline__ int
 262 find_object (struct ftw_data *data, struct STAT *st)
 263 {
 264   struct known_object obj;
 265   obj.dev = st->st_dev;
 266   obj.ino = st->st_ino;
 267   return __tfind (&obj, &data->known_objects, object_compare) != NULL;
 268 }
 269
 270
 271 static __inline__ int
 272 __attribute ((always_inline))
 273 open_dir_stream (struct ftw_data *data, struct dir_data *dirp)
 274 {
 275   int result = 0;
 276
 277   if (data->dirstreams[data->actdir] != NULL)
 278     {
 279       /* Oh, oh.  We must close this stream.  Get all remaining
 280          entries and store them as a list in the `content' member of
 281          the `struct dir_data' variable.  */
 282       size_t bufsize = 1024;
 283       char *buf = malloc (bufsize);
 284
 285       if (buf == NULL)
 286         result = -1;
 287       else
 288         {
 289           DIR *st = data->dirstreams[data->actdir]->stream;
 290           struct dirent64 *d;
 291           size_t actsize = 0;
 292
 293           while ((d = __readdir64 (st)) != NULL)
 294             {
 295               size_t this_len = NAMLEN (d);
 296               if (actsize + this_len + 2 >= bufsize)
 297                 {
 298                   char *newp;
 299                   bufsize += MAX (1024, 2 * this_len);
 300                   newp = (char *) realloc (buf, bufsize);
 301                   if (newp == NULL)
 302                     {
 303                       /* No more memory.  */
 304                       int save_err = errno;
 305                       free (buf);
 306                       __set_errno (save_err);
 307                       result = -1;
 308                       break;
 309                     }
 310                   buf = newp;
 311                 }
 312
 313               *((char *) __mempcpy (buf + actsize, d->d_name, this_len))
 314                 = '\0';
 315               actsize += this_len + 1;
 316             }
 317
 318           /* Terminate the list with an additional NUL byte.  */
 319           buf[actsize++] = '\0';
 320
 321           /* Shrink the buffer to what we actually need.  */
 322           data->dirstreams[data->actdir]->content = realloc (buf, actsize);
 323           if (data->dirstreams[data->actdir]->content == NULL)
 324             {
 325               int save_err = errno;
 326               free (buf);
 327               __set_errno (save_err);
 328               result = -1;
 329             }
 330           else
 331             {
 332               __closedir (st);
 333               data->dirstreams[data->actdir]->stream = NULL;
 334               data->dirstreams[data->actdir] = NULL;
 335             }
 336         }
 337     }
 338
 339   /* Open the new stream.  */
 340   if (result == 0)
 341     {
 342       const char *name = ((data->flags & FTW_CHDIR)
 343                           ? data->dirbuf + data->ftw.base: data->dirbuf);
 344       assert (data->dirstreams[data->actdir] == NULL);
 345
 346       dirp->stream = __opendir (name);
 347       if (dirp->stream == NULL)
 348         result = -1;
 349       else
 350         {
 351           dirp->content = NULL;
 352           data->dirstreams[data->actdir] = dirp;
 353
 354           if (++data->actdir == data->maxdir)
 355             data->actdir = 0;
 356         }
 357     }
 358
 359   return result;
 360 }
 361
 362
 363 static int
 364 internal_function
 365 process_entry (struct ftw_data *data, struct dir_data *dir, const char *name,
 366                size_t namlen)
 367 {
 368   struct STAT st;
 369   int result = 0;
 370   int flag = 0;
 371   size_t new_buflen;
 372
 373   if (name[0] == '.' && (name[1] == '\0'
 374                          || (name[1] == '.' && name[2] == '\0')))
 375     /* Don't process the "." and ".." entries.  */
 376     return 0;
 377
 378   new_buflen = data->ftw.base + namlen + 2;
 379   if (data->dirbufsize < new_buflen)
 380     {
 381       /* Enlarge the buffer.  */
 382       char *newp;
 383
 384       data->dirbufsize = 2 * new_buflen;
 385       newp = (char *) realloc (data->dirbuf, data->dirbufsize);
 386       if (newp == NULL)
 387         return -1;
 388       data->dirbuf = newp;
 389     }
 390
 391   *((char *) __mempcpy (data->dirbuf + data->ftw.base, name, namlen)) = '\0';
 392
 393   if ((data->flags & FTW_CHDIR) == 0)
 394     name = data->dirbuf;
 395
 396   if (((data->flags & FTW_PHYS)
 397        ? LXSTAT (_STAT_VER, name, &st)
 398        : XSTAT (_STAT_VER, name, &st)) < 0)
 399     {
 400       if (errno != EACCES && errno != ENOENT)
 401         result = -1;
 402       else if (!(data->flags & FTW_PHYS)
 403                && LXSTAT (_STAT_VER, name, &st) == 0
 404                && S_ISLNK (st.st_mode))
 405         flag = FTW_SLN;
 406       else
 407         flag = FTW_NS;
 408     }
 409   else
 410     {
 411       if (S_ISDIR (st.st_mode))
 412         flag = FTW_D;
 413       else if (S_ISLNK (st.st_mode))
 414         flag = FTW_SL;
 415       else
 416         flag = FTW_F;
 417     }
 418
 419   if (result == 0
 420       && (flag == FTW_NS
 421           || !(data->flags & FTW_MOUNT) || st.st_dev == data->dev))
 422     {
 423       if (flag == FTW_D)
 424         {
 425           if ((data->flags & FTW_PHYS)
 426               || (!find_object (data, &st)
 427                   /* Remember the object.  */
 428                   && (result = add_object (data, &st)) == 0))
 429             result = ftw_dir (data, &st, dir);
 430         }
 431       else
 432         result = (*data->func) (data->dirbuf, &st, data->cvt_arr[flag],
 433                                 &data->ftw);
 434     }
 435
 436   if ((data->flags & FTW_ACTIONRETVAL) && result == FTW_SKIP_SUBTREE)
 437     result = 0;
 438
 439   return result;
 440 }
 441
 442
 443 static int
 444 __attribute ((noinline))
 445 internal_function
 446 ftw_dir (struct ftw_data *data, struct STAT *st, struct dir_data *old_dir)
 447 {
 448   struct dir_data dir;
 449   struct dirent64 *d;
 450   int previous_base = data->ftw.base;
 451   int result;
 452   char *startp;
 453
 454   /* Open the stream for this directory.  This might require that
 455      another stream has to be closed.  */
 456   result = open_dir_stream (data, &dir);
 457   if (result != 0)
 458     {
 459       if (errno == EACCES)
 460         /* We cannot read the directory.  Signal this with a special flag.  */
 461         result = (*data->func) (data->dirbuf, st, FTW_DNR, &data->ftw);
 462
 463       return result;
 464     }
 465
 466   /* First, report the directory (if not depth-first).  */
 467   if (!(data->flags & FTW_DEPTH))
 468     {
 469       result = (*data->func) (data->dirbuf, st, FTW_D, &data->ftw);
 470       if (result != 0)
 471         {
 472           int save_err;
 473 fail:
 474           save_err = errno;
 475           __closedir (dir.stream);
 476           __set_errno (save_err);
 477
 478           if (data->actdir-- == 0)
 479             data->actdir = data->maxdir - 1;
 480           data->dirstreams[data->actdir] = NULL;
 481           return result;
 482         }
 483     }
 484
 485   /* If necessary, change to this directory.  */
 486   if (data->flags & FTW_CHDIR)
 487     {
 488       if (__fchdir (dirfd (dir.stream)) < 0)
 489         {
 490           result = -1;
 491           goto fail;
 492         }
 493     }
 494
 495   /* Next, update the `struct FTW' information.  */
 496   ++data->ftw.level;
 497   startp = strchr (data->dirbuf, '\0');
 498   /* There always must be a directory name.  */
 499   assert (startp != data->dirbuf);
 500   if (startp[-1] != '/')
 501     *startp++ = '/';
 502   data->ftw.base = startp - data->dirbuf;
 503
 504   while (dir.stream != NULL && (d = __readdir64 (dir.stream)) != NULL)
 505     {
 506       result = process_entry (data, &dir, d->d_name, NAMLEN (d));
 507       if (result != 0)
 508         break;
 509     }
 510
 511   if (dir.stream != NULL)
 512     {
 513       /* The stream is still open.  I.e., we did not need more
 514          descriptors.  Simply close the stream now.  */
 515       int save_err = errno;
 516
 517       assert (dir.content == NULL);
 518
 519       __closedir (dir.stream);
 520       __set_errno (save_err);
 521
 522       if (data->actdir-- == 0)
 523         data->actdir = data->maxdir - 1;
 524       data->dirstreams[data->actdir] = NULL;
 525     }
 526   else
 527     {
 528       int save_err;
 529       char *runp = dir.content;
 530
 531       while (result == 0 && *runp != '\0')
 532         {
 533           char *endp = strchr (runp, '\0');
 534
 535           result = process_entry (data, &dir, runp, endp - runp);
 536
 537           runp = endp + 1;
 538         }
 539
 540       save_err = errno;
 541       free (dir.content);
 542       __set_errno (save_err);
 543     }
 544
 545   if ((data->flags & FTW_ACTIONRETVAL) && result == FTW_SKIP_SIBLINGS)
 546     result = 0;
 547
 548   /* Prepare the return, revert the `struct FTW' information.  */
 549   data->dirbuf[data->ftw.base - 1] = '\0';
 550   --data->ftw.level;
 551   data->ftw.base = previous_base;
 552
 553   if ((data->flags & FTW_CHDIR)
 554       && (result == 0
 555           || ((data->flags & FTW_ACTIONRETVAL)
 556               && (result != -1 && result != FTW_STOP))))
 557     {
 558       /* Change back to the parent directory.  */
 559       int done = 0;
 560       if (old_dir && old_dir->stream != NULL)
 561         if (__fchdir (dirfd (old_dir->stream)) == 0)
 562           done = 1;
 563
 564       if (!done)
 565         {
 566           if (data->ftw.base == 1)
 567             {
 568               if (__chdir ("/") < 0)
 569                 result = -1;
 570             }
 571           else
 572             if (__chdir ("..") < 0)
 573               result = -1;
 574         }
 575     }
 576
 577   /* Finally, if we process depth-first report the directory.  */
 578   if (result == 0 && (data->flags & FTW_DEPTH))
 579     result = (*data->func) (data->dirbuf, st, FTW_DP, &data->ftw);
 580
 581   return result;
 582 }
 583
 584
 585 static int
 586 __attribute ((noinline))
 587 internal_function
 588 ftw_startup (const char *dir, int is_nftw, void *func, int descriptors,
 589              int flags)
 590 {
 591   struct ftw_data data;
 592   struct STAT st;
 593   int result = 0;
 594   int save_err;
 595   char *cwd = NULL;
 596   char *cp;
 597
 598   /* First make sure the parameters are reasonable.  */
 599   if (dir[0] == '\0')
 600     {
 601       __set_errno (ENOENT);
 602       return -1;
 603     }
 604
 605   data.maxdir = descriptors < 1 ? 1 : descriptors;
 606   data.actdir = 0;
 607   data.dirstreams = (struct dir_data **) alloca (data.maxdir
 608                                                  * sizeof (struct dir_data *));
 609   memset (data.dirstreams, '\0', data.maxdir * sizeof (struct dir_data *));
 610
 611   /* PATH_MAX is always defined when we get here.  */
 612   data.dirbufsize = MAX (2 * strlen (dir), PATH_MAX);
 613   data.dirbuf = (char *) malloc (data.dirbufsize);
 614   if (data.dirbuf == NULL)
 615     return -1;
 616   cp = __stpcpy (data.dirbuf, dir);
 617   /* Strip trailing slashes.  */
 618   while (cp > data.dirbuf + 1 && cp[-1] == '/')
 619     --cp;
 620   *cp = '\0';
 621
 622   data.ftw.level = 0;
 623
 624   /* Find basename.  */
 625   while (cp > data.dirbuf && cp[-1] != '/')
 626     --cp;
 627   data.ftw.base = cp - data.dirbuf;
 628
 629   data.flags = flags;
 630
 631   /* This assignment might seem to be strange but it is what we want.
 632      The trick is that the first three arguments to the `ftw' and
 633      `nftw' callback functions are equal.  Therefore we can call in
 634      every case the callback using the format of the `nftw' version
 635      and get the correct result since the stack layout for a function
 636      call in C allows this.  */
 637   data.func = (NFTW_FUNC_T) func;
 638
 639   /* Since we internally use the complete set of FTW_* values we need
 640      to reduce the value range before calling a `ftw' callback.  */
 641   data.cvt_arr = is_nftw ? nftw_arr : ftw_arr;
 642
 643   /* No object known so far.  */
 644   data.known_objects = NULL;
 645
 646   /* Now go to the directory containing the initial file/directory.  */
 647   if (flags & FTW_CHDIR)
 648     {
 649       /* GNU extension ahead.  */
 650       cwd =  __getcwd (NULL, 0);
 651       if (cwd == NULL)
 652         result = -1;
 653       else if (data.ftw.base > 0)
 654         {
 655           /* Change to the directory the file is in.  In data.dirbuf
 656              we have a writable copy of the file name.  Just NUL
 657              terminate it for now and change the directory.  */
 658           if (data.ftw.base == 1)
 659             /* I.e., the file is in the root directory.  */
 660             result = __chdir ("/");
 661           else
 662             {
 663               char ch = data.dirbuf[data.ftw.base - 1];
 664               data.dirbuf[data.ftw.base - 1] = '\0';
 665               result = __chdir (data.dirbuf);
 666               data.dirbuf[data.ftw.base - 1] = ch;
 667             }
 668         }
 669     }
 670
 671   /* Get stat info for start directory.  */
 672   if (result == 0)
 673     {
 674       const char *name = ((data.flags & FTW_CHDIR)
 675                           ? data.dirbuf + data.ftw.base
 676                           : data.dirbuf);
 677
 678       if (((flags & FTW_PHYS)
 679            ? LXSTAT (_STAT_VER, name, &st)
 680            : XSTAT (_STAT_VER, name, &st)) < 0)
 681         {
 682           if (!(flags & FTW_PHYS)
 683               && errno == ENOENT
 684               && LXSTAT (_STAT_VER, name, &st) == 0
 685               && S_ISLNK (st.st_mode))
 686             result = (*data.func) (data.dirbuf, &st, data.cvt_arr[FTW_SLN],
 687                                    &data.ftw);
 688           else
 689             /* No need to call the callback since we cannot say anything
 690                about the object.  */
 691             result = -1;
 692         }
 693       else
 694         {
 695           if (S_ISDIR (st.st_mode))
 696             {
 697               /* Remember the device of the initial directory in case
 698                  FTW_MOUNT is given.  */
 699               data.dev = st.st_dev;
 700
 701               /* We know this directory now.  */
 702               if (!(flags & FTW_PHYS))
 703                 result = add_object (&data, &st);
 704
 705               if (result == 0)
 706                 result = ftw_dir (&data, &st, NULL);
 707             }
 708           else
 709             {
 710               int flag = S_ISLNK (st.st_mode) ? FTW_SL : FTW_F;
 711
 712               result = (*data.func) (data.dirbuf, &st, data.cvt_arr[flag],
 713                                      &data.ftw);
 714             }
 715         }
 716
 717       if ((flags & FTW_ACTIONRETVAL)
 718           && (result == FTW_SKIP_SUBTREE || result == FTW_SKIP_SIBLINGS))
 719         result = 0;
 720     }
 721
 722   /* Return to the start directory (if necessary).  */
 723   if (cwd != NULL)
 724     {
 725       save_err = errno;
 726       __chdir (cwd);
 727       free (cwd);
 728       __set_errno (save_err);
 729     }
 730
 731   /* Free all memory.  */
 732   save_err = errno;
 733   __tdestroy (data.known_objects, free);
 734   free (data.dirbuf);
 735   __set_errno (save_err);
 736
 737   return result;
 738 }
 739
 740
 741
 742 /* Entry points.  */
 743 #ifdef __UCLIBC_HAS_FTW__
 744 int
 745 FTW_NAME (const char *path, FTW_FUNC_T func, int descriptors)
 746 {
 747   return ftw_startup (path, 0, func, descriptors, 0);
 748 }
 749 #endif
 750
 751 #ifdef __UCLIBC_HAS_NFTW__
 752 #ifndef _LIBC
 753 int
 754 NFTW_NAME (const char *path, NFTW_FUNC_T func, int descriptors, int flags)
 755 {
 756   return ftw_startup (path, 1, func, descriptors, flags);
 757 }
 758 #else
 759
 760 #include <shlib-compat.h>
 761
 762 int NFTW_NEW_NAME (const char *, NFTW_FUNC_T, int, int);
 763
 764 int
 765 NFTW_NEW_NAME (const char *path, NFTW_FUNC_T func, int descriptors, int flags)
 766 {
 767   if (flags
 768       & ~(FTW_PHYS | FTW_MOUNT | FTW_CHDIR | FTW_DEPTH | FTW_ACTIONRETVAL))
 769     {
 770       __set_errno (EINVAL);
 771       return -1;
 772     }
 773   return ftw_startup (path, 1, func, descriptors, flags);
 774 }
 775
 776 versioned_symbol (libc, NFTW_NEW_NAME, NFTW_NAME, GLIBC_2_3_3);
 777
 778 #if SHLIB_COMPAT(libc, GLIBC_2_1, GLIBC_2_3_3)
 779
 780 /* Older nftw* version just ignored all unknown flags.  */
 781
 782 int NFTW_OLD_NAME (const char *, NFTW_FUNC_T, int, int);
 783
 784 int
 785 attribute_compat_text_section
 786 NFTW_OLD_NAME (const char *path, NFTW_FUNC_T func, int descriptors, int flags)
 787 {
 788   flags &= (FTW_PHYS | FTW_MOUNT | FTW_CHDIR | FTW_DEPTH);
 789   return ftw_startup (path, 1, func, descriptors, flags);
 790 }
 791
 792 compat_symbol (libc, NFTW_OLD_NAME, NFTW_NAME, GLIBC_2_1);
 793 #endif
 794 #endif
 795 #endif