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/* $NetBSD: dirent.h,v 1.30 2016/01/22 23:31:30 dholland Exp $ */
/*-
* 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.
* 3. 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.
*
* @(#)dirent.h 8.3 (Berkeley) 8/10/94
*/
#ifndef _SYS_DIRENT_H_
#define _SYS_DIRENT_H_
#include <sys/cdefs.h>
#include <sys/featuretest.h>
/*
* The dirent structure defines the format of directory entries returned by
* the getdents(2) system call.
*
* A directory entry has a struct dirent at the front of it, containing its
* inode number, the length of the entry, and the length of the name
* contained in the entry. These are followed by the name padded to
* _DIRENT_ALIGN() byte boundary with null bytes. All names are guaranteed
* NUL terminated. The maximum length of a name in a directory is MAXNAMLEN.
*/
struct dirent {
ino_t d_fileno; /* file number of entry */
uint16_t d_reclen; /* length of this record */
uint16_t d_namlen; /* length of string in d_name */
uint8_t d_type; /* file type, see below */
#if defined(_NETBSD_SOURCE)
#define MAXNAMLEN 511 /* must be kept in sync with NAME_MAX */
char d_name[MAXNAMLEN + 1]; /* name must be no longer than this */
#else
char d_name[511 + 1]; /* name must be no longer than this */
#endif
};
#if defined(_NETBSD_SOURCE)
/*
* File types
*/
#define DT_UNKNOWN 0
#define DT_FIFO 1
#define DT_CHR 2
#define DT_DIR 4
#define DT_BLK 6
#define DT_REG 8
#define DT_LNK 10
#define DT_SOCK 12
#define DT_WHT 14
/*
* Caution: the following macros are used by the ufs/ffs code on ffs's
* struct direct as well as the exposed struct dirent. The two
* structures are not the same, so it's important (until ufs is fixed,
* XXX) that the macro definitions remain type-polymorphic.
*/
/*
* The _DIRENT_ALIGN macro returns the alignment of struct dirent.
* struct direct and struct dirent12 used 4 byte alignment but
* struct dirent uses 8.
*/
#define _DIRENT_ALIGN(dp) (sizeof((dp)->d_fileno) - 1)
/*
* The _DIRENT_NAMEOFF macro returns the offset of the d_name field in
* struct dirent
*/
#if __GNUC_PREREQ__(4, 0)
#define _DIRENT_NAMEOFF(dp) __builtin_offsetof(__typeof__(*(dp)), d_name)
#else
#define _DIRENT_NAMEOFF(dp) \
((char *)(void *)&(dp)->d_name - (char *)(void *)dp)
#endif
/*
* The _DIRENT_RECLEN macro gives the minimum record length which will hold
* a name of size "namlen". This requires the amount of space in struct dirent
* without the d_name field, plus enough space for the name with a terminating
* null byte (namlen+1), rounded up to a the appropriate byte boundary.
*/
#define _DIRENT_RECLEN(dp, namlen) \
((_DIRENT_NAMEOFF(dp) + (namlen) + 1 + _DIRENT_ALIGN(dp)) & \
~_DIRENT_ALIGN(dp))
/*
* The _DIRENT_SIZE macro returns the minimum record length required for
* name name stored in the current record.
*/
#define _DIRENT_SIZE(dp) _DIRENT_RECLEN(dp, (dp)->d_namlen)
/*
* The _DIRENT_NEXT macro advances to the next dirent record.
*/
#define _DIRENT_NEXT(dp) ((void *)((char *)(void *)(dp) + (dp)->d_reclen))
/*
* The _DIRENT_MINSIZE returns the size of an empty (invalid) record.
*/
#define _DIRENT_MINSIZE(dp) _DIRENT_RECLEN(dp, 0)
/*
* Convert between stat structure types and directory types.
*/
#define IFTODT(mode) (((mode) & 0170000) >> 12)
#define DTTOIF(dirtype) ((dirtype) << 12)
#endif
#endif /* !_SYS_DIRENT_H_ */
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