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