/* root-dev-ino.c -- get the device and inode numbers for '/'.
   Copyright (C) 2003-2020 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 <https://www.gnu.org/licenses/>.  */

/* Written by Jim Meyering. */

#include <config.h>

#include "root-dev-ino.h"

#include <stdlib.h>

/* Call lstat to get the device and inode numbers for '/'.
   Upon failure, return NULL.  Otherwise, set the members of
   *ROOT_D_I accordingly and return ROOT_D_I.  */
struct root_dev_ino *
get_root_dev_ino (struct root_dev_ino *root_d_i)
{
  struct stat statbuf;
  if (lstat ("/", &statbuf))
    return NULL;
  root_d_i->single_slash.st_ino = statbuf.st_ino;
  root_d_i->single_slash.st_dev = statbuf.st_dev;
  if (lstat ("//", &statbuf))
    return NULL;
  root_d_i->double_slash.st_ino = statbuf.st_ino;
  root_d_i->double_slash.st_dev = statbuf.st_dev;
  return root_d_i;
}
