gl/lib/root-dev-ino.c

   1 /* root-dev-ino.c -- get the device and inode numbers for '/'.
   2    Copyright (C) 2003-2023 Free Software Foundation, Inc.
   3
   4    This program is free software: you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation, either version 3 of the License, or
   7    (at your option) any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  16
  17 /* Written by Jim Meyering. */
  18
  19 #include <config.h>
  20
  21 #include "root-dev-ino.h"
  22
  23 #include <stdlib.h>
  24
  25 /* Call lstat to get the device and inode numbers for '/'.
  26    Upon failure, return nullptr.  Otherwise, set the members of
  27    *ROOT_D_I accordingly and return ROOT_D_I.  */
  28 struct dev_ino *
  29 get_root_dev_ino (struct dev_ino *root_d_i)
  30 {
  31   struct stat statbuf;
  32   if (lstat ("/", &statbuf))
  33     return nullptr;
  34   root_d_i->st_ino = statbuf.st_ino;
  35   root_d_i->st_dev = statbuf.st_dev;
  36   return root_d_i;
  37 }