text: /* Work around an fstatat bug on Solaris 9.
  
     Copyright (C) 2006, 2009-2014 Free Software Foundation, Inc.
  
     This program is free software: you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
  
     This program is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     GNU General Public License for more details.
  
     You should have received a copy of the GNU General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  
  /* Written by Paul Eggert and Jim Meyering.  */
  
  /* If the user's config.h happens to include <sys/stat.h>, let it include only
     the system's <sys/stat.h> here, so that orig_fstatat doesn't recurse to
     rpl_fstatat.  */
  #define __need_system_sys_stat_h
  #include <config.h>
  
  /* Get the original definition of fstatat.  It might be defined as a macro.  */
  #include <sys/types.h>
  #include <sys/stat.h>
  #undef __need_system_sys_stat_h
  
  #if HAVE_FSTATAT
  static int
  orig_fstatat (int fd, char const *filename, struct stat *buf, int flags)
  {
    return fstatat (fd, filename, buf, flags);
  }
  #endif
  
  /* Write "sys/stat.h" here, not <sys/stat.h>, otherwise OSF/1 5.1 DTK cc
     eliminates this include because of the preliminary #include <sys/stat.h>
     above.  */
  #include "sys/stat.h"
  
  #include <errno.h>
  #include <fcntl.h>
  #include <string.h>
  
  #if HAVE_FSTATAT && HAVE_WORKING_FSTATAT_ZERO_FLAG
  
  # ifndef LSTAT_FOLLOWS_SLASHED_SYMLINK
  #  define LSTAT_FOLLOWS_SLASHED_SYMLINK 0
  # endif
  
  /* fstatat should always follow symbolic links that end in /, but on
     Solaris 9 it doesn't if AT_SYMLINK_NOFOLLOW is specified.
     Likewise, trailing slash on a non-directory should be an error.
     These are the same problems that lstat.c and stat.c address, so
     solve it in a similar way.
  
     AIX 7.1 fstatat (AT_FDCWD, ..., 0) always fails, which is a bug.
     Work around this bug if FSTATAT_AT_FDCWD_0_BROKEN is nonzero.  */
  
  int
  rpl_fstatat (int fd, char const *file, struct stat *st, int flag)
  {
    int result = orig_fstatat (fd, file, st, flag);
    size_t len;
  
    if (LSTAT_FOLLOWS_SLASHED_SYMLINK || result != 0)
      return result;
    len = strlen (file);
    if (flag & AT_SYMLINK_NOFOLLOW)
      {
        /* Fix lstat behavior.  */
        if (file[len - 1] != '/' || S_ISDIR (st->st_mode))
          return 0;
        if (!S_ISLNK (st->st_mode))
          {
            errno = ENOTDIR;
            return -1;
          }
        result = orig_fstatat (fd, file, st, flag & ~AT_SYMLINK_NOFOLLOW);
      }
    /* Fix stat behavior.  */
    if (result == 0 && !S_ISDIR (st->st_mode) && file[len - 1] == '/')
      {
        errno = ENOTDIR;
        return -1;
      }
    return result;
  }
  
  #else /* ! (HAVE_FSTATAT && HAVE_WORKING_FSTATAT_ZERO_FLAG) */
  
  /* On mingw, the gnulib <sys/stat.h> defines 'stat' as a function-like
     macro; but using it in AT_FUNC_F2 causes compilation failure
     because the preprocessor sees a use of a macro that requires two
     arguments but is only given one.  Hence, we need an inline
     forwarder to get past the preprocessor.  */
  static int
  stat_func (char const *name, struct stat *st)
  {
    return stat (name, st);
  }
  
  /* Likewise, if there is no native 'lstat', then the gnulib
     <sys/stat.h> defined it as stat, which also needs adjustment.  */
  # if !HAVE_LSTAT
  #  undef lstat
  #  define lstat stat_func
  # endif
  
  /* Replacement for Solaris' function by the same name.
     <http://www.google.com/search?q=fstatat+site:docs.sun.com>
     First, try to simulate it via l?stat ("/proc/self/fd/FD/FILE").
     Failing that, simulate it via save_cwd/fchdir/(stat|lstat)/restore_cwd.
     If either the save_cwd or the restore_cwd fails (relatively unlikely),
     then give a diagnostic and exit nonzero.
     Otherwise, this function works just like Solaris' fstatat.  */
  
  # define AT_FUNC_NAME fstatat
  # define AT_FUNC_F1 lstat
  # define AT_FUNC_F2 stat_func
  # define AT_FUNC_USE_F1_COND AT_SYMLINK_NOFOLLOW
  # define AT_FUNC_POST_FILE_PARAM_DECLS , struct stat *st, int flag
  # define AT_FUNC_POST_FILE_ARGS        , st
  # include "at-func.c"
  # undef AT_FUNC_NAME
  # undef AT_FUNC_F1
  # undef AT_FUNC_F2
  # undef AT_FUNC_USE_F1_COND
  # undef AT_FUNC_POST_FILE_PARAM_DECLS
  # undef AT_FUNC_POST_FILE_ARGS
  
  #endif /* !HAVE_FSTATAT */
  