1  /* Determine whether two stat buffers are known to refer to the same file.
       2  
       3     Copyright (C) 2006, 2009-2023 Free Software Foundation, Inc.
       4  
       5     This file is free software: you can redistribute it and/or modify
       6     it under the terms of the GNU Lesser General Public License as
       7     published by the Free Software Foundation; either version 2.1 of the
       8     License, or (at your option) any later version.
       9  
      10     This file is distributed in the hope that it will be useful,
      11     but WITHOUT ANY WARRANTY; without even the implied warranty of
      12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      13     GNU Lesser General Public License for more details.
      14  
      15     You should have received a copy of the GNU Lesser General Public License
      16     along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
      17  
      18  #ifndef SAME_INODE_H
      19  # define SAME_INODE_H 1
      20  
      21  # include <sys/types.h>
      22  
      23  # if defined __VMS && __CRTL_VER < 80200000
      24  #  define SAME_INODE(a, b)             \
      25      ((a).st_ino[0] == (b).st_ino[0]    \
      26       && (a).st_ino[1] == (b).st_ino[1] \
      27       && (a).st_ino[2] == (b).st_ino[2] \
      28       && (a).st_dev == (b).st_dev)
      29  # elif defined _WIN32 && ! defined __CYGWIN__
      30     /* Native Windows.  */
      31  #  if _GL_WINDOWS_STAT_INODES
      32      /* stat() and fstat() set st_dev and st_ino to 0 if information about
      33         the inode is not available.  */
      34  #   define SAME_INODE(a, b) \
      35       (!((a).st_ino == 0 && (a).st_dev == 0) \
      36        && (a).st_ino == (b).st_ino && (a).st_dev == (b).st_dev)
      37  #  else
      38      /* stat() and fstat() set st_ino to 0 always.  */
      39  #   define SAME_INODE(a, b) 0
      40  #  endif
      41  # else
      42  #  define SAME_INODE(a, b)    \
      43      ((a).st_ino == (b).st_ino \
      44       && (a).st_dev == (b).st_dev)
      45  # endif
      46  
      47  #endif