1 /* help detect directory cycles efficiently
3 Copyright (C) 2003-2004, 2006, 2009-2015 Free Software Foundation, Inc.
5 This program is free software: you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 3 of the License, or
8 (at your option) any later version.
10 This program 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 General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program. If not, see <http://www.gnu.org/licenses/>. */
18 /* Written by Jim Meyering */
21 # define CYCLE_CHECK_H 1
26 # include "same-inode.h"
28 struct cycle_check_state
30 struct dev_ino dev_ino
;
31 uintmax_t chdir_counter
;
35 void cycle_check_init (struct cycle_check_state
*state
);
36 bool cycle_check (struct cycle_check_state
*state
, struct stat
const *sb
);
38 # define CYCLE_CHECK_REFLECT_CHDIR_UP(State, SB_dir, SB_subdir) \
41 /* You must call cycle_check at least once before using this macro. */ \
42 if ((State)->chdir_counter == 0) \
44 if (SAME_INODE ((State)->dev_ino, SB_subdir)) \
46 (State)->dev_ino.st_dev = (SB_dir).st_dev; \
47 (State)->dev_ino.st_ino = (SB_dir).st_ino; \