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/* Traverse a file hierarchy.
Copyright (C) 2004, 2005 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 2, 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, write to the Free Software Foundation,
Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
/*
* Copyright (c) 1989, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)fts.h 8.3 (Berkeley) 8/14/94
*/
#ifndef _FTS_H
# define _FTS_H 1
# ifdef _LIBC
# include <features.h>
# define _LGPL_PACKAGE 1
# else
# undef __THROW
# define __THROW
# undef __BEGIN_DECLS
# define __BEGIN_DECLS
# undef __END_DECLS
# define __END_DECLS
# endif
# include <stddef.h>
# include <sys/types.h>
# include <sys/stat.h>
typedef struct {
struct _ftsent *fts_cur; /* current node */
struct _ftsent *fts_child; /* linked list of children */
struct _ftsent **fts_array; /* sort array */
dev_t fts_dev; /* starting device # */
char *fts_path; /* file name for this descent */
int fts_rfd; /* fd for root */
size_t fts_pathlen; /* sizeof(path) */
size_t fts_nitems; /* elements in the sort array */
int (*fts_compar) (struct _ftsent const **, struct _ftsent const **);
/* compare fn */
# define FTS_COMFOLLOW 0x0001 /* follow command line symlinks */
# define FTS_LOGICAL 0x0002 /* logical walk */
# define FTS_NOCHDIR 0x0004 /* don't change directories */
# define FTS_NOSTAT 0x0008 /* don't get stat info */
# define FTS_PHYSICAL 0x0010 /* physical walk */
# define FTS_SEEDOT 0x0020 /* return dot and dot-dot */
# define FTS_XDEV 0x0040 /* don't cross devices */
# define FTS_WHITEOUT 0x0080 /* return whiteout information */
/* There are two ways to detect cycles.
The lazy way (which works only with FTS_PHYSICAL),
with which one may process a directory that is a
part of the cycle several times before detecting the cycle.
The `tight' way, whereby fts uses more memory (proportional
to number of `active' directories, aka distance from root
of current tree to current directory -- see active_dir_ht)
to detect any cycle right away. For example, du must use
this option to avoid counting disk space in a cycle multiple
times, but chown -R need not.
The default is to use the constant-memory lazy way, when possible
(see below).
However, with FTS_LOGICAL (when following symlinks, e.g., chown -L)
using lazy cycle detection is inadequate. For example, traversing
a directory containing a symbolic link to a peer directory, it is
possible to encounter the same directory twice even though there
is no cycle:
dir
...
slink -> dir
So, when FTS_LOGICAL is selected, we have to use a different
mode of cycle detection: FTS_TIGHT_CYCLE_CHECK. */
# define FTS_TIGHT_CYCLE_CHECK 0x0100
# define FTS_OPTIONMASK 0x01ff /* valid user option mask */
# define FTS_NAMEONLY 0x1000 /* (private) child names only */
# define FTS_STOP 0x2000 /* (private) unrecoverable error */
int fts_options; /* fts_open options, global flags */
# if !_LGPL_PACKAGE
union {
/* This data structure is used if FTS_TIGHT_CYCLE_CHECK is
specified. It records the directories between a starting
point and the current directory. I.e., a directory is
recorded here IFF we have visited it once, but we have not
yet completed processing of all its entries. Every time we
visit a new directory, we add that directory to this set.
When we finish with a directory (usually by visiting it a
second time), we remove it from this set. Each entry in
this data structure is a device/inode pair. This data
structure is used to detect directory cycles efficiently and
promptly even when the depth of a hierarchy is in the tens
of thousands. */
struct hash_table *ht;
/* This data structure uses lazy checking, as done by rm via
cycle-check.c. It's the default, but it's not appropriate
for programs like du. */
struct cycle_check_state *state;
} fts_cycle;
# endif
} FTS;
typedef struct _ftsent {
struct _ftsent *fts_cycle; /* cycle node */
struct _ftsent *fts_parent; /* parent directory */
struct _ftsent *fts_link; /* next file in directory */
long fts_number; /* local numeric value */
void *fts_pointer; /* local address value */
char *fts_accpath; /* access file name */
char *fts_path; /* root name; == fts_fts->fts_path */
int fts_errno; /* errno for this node */
int fts_symfd; /* fd for symlink */
size_t fts_pathlen; /* strlen(fts_path) */
FTS *fts_fts; /* the file hierarchy itself */
# define FTS_ROOTPARENTLEVEL (-1)
# define FTS_ROOTLEVEL 0
ptrdiff_t fts_level; /* depth (-1 to N) */
size_t fts_namelen; /* strlen(fts_name) */
# define FTS_D 1 /* preorder directory */
# define FTS_DC 2 /* directory that causes cycles */
# define FTS_DEFAULT 3 /* none of the above */
# define FTS_DNR 4 /* unreadable directory */
# define FTS_DOT 5 /* dot or dot-dot */
# define FTS_DP 6 /* postorder directory */
# define FTS_ERR 7 /* error; errno is set */
# define FTS_F 8 /* regular file */
# define FTS_INIT 9 /* initialized only */
# define FTS_NS 10 /* stat(2) failed */
# define FTS_NSOK 11 /* no stat(2) requested */
# define FTS_SL 12 /* symbolic link */
# define FTS_SLNONE 13 /* symbolic link without target */
# define FTS_W 14 /* whiteout object */
unsigned short int fts_info; /* user flags for FTSENT structure */
# define FTS_DONTCHDIR 0x01 /* don't chdir .. to the parent */
# define FTS_SYMFOLLOW 0x02 /* followed a symlink to get here */
unsigned short int fts_flags; /* private flags for FTSENT structure */
# define FTS_AGAIN 1 /* read node again */
# define FTS_FOLLOW 2 /* follow symbolic link */
# define FTS_NOINSTR 3 /* no instructions */
# define FTS_SKIP 4 /* discard node */
unsigned short int fts_instr; /* fts_set() instructions */
struct stat fts_statp[1]; /* stat(2) information */
char fts_name[1]; /* file name */
} FTSENT;
__BEGIN_DECLS
FTSENT *fts_children (FTS *, int) __THROW;
int fts_close (FTS *) __THROW;
FTS *fts_open (char * const *, int,
int (*)(const FTSENT **, const FTSENT **)) __THROW;
FTSENT *fts_read (FTS *) __THROW;
int fts_set (FTS *, FTSENT *, int) __THROW;
__END_DECLS
#endif /* fts.h */
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