sys/sys/dirent.h

   1 /*-
   2  * Copyright (c) 1989, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  *      @(#)dirent.h    8.3 (Berkeley) 8/10/94
  34  * $FreeBSD: src/sys/sys/dirent.h,v 1.11 1999/12/29 04:24:39 peter Exp $
  35  * $DragonFly: src/sys/sys/dirent.h,v 1.7 2007/11/20 21:03:46 dillon Exp $
  36  */
  37
  38 #ifndef _SYS_DIRENT_H_
  39 #define _SYS_DIRENT_H_
  40
  41 /*
  42  * The dirent structure defines the format of directory entries returned by
  43  * the getdirentries(2) system call.
  44  *
  45  * A directory entry has a struct dirent at the front of it, containing its
  46  * inode number, the length of the entry, and the length of the name
  47  * contained in the entry.  These are followed by the name padded to a 8
  48  * byte boundary with null bytes.  All names are guaranteed null terminated.
  49  */
  50
  51 /*
  52  * XXX Temporary bandaids to keep changes small:
  53  * XXX - for userland programs which don't specify any C or POSIX options,
  54  * XXX   keep the old d_fileno and map d_ino via macro.  Everything else gets
  55  * XXX   the POSIX d_ino and only that.
  56  * XXX - d_name is declared with the current maximum directory entry length,
  57  * XXX   instead of being incomplete. Code must allocate space for the
  58  * XXX   directory itself.
  59  */
  60
  61 #include <sys/cdefs.h>
  62 #include <sys/types.h>
  63
  64 struct dirent {
  65 #if defined(_KERNEL) || !defined(__BSD_VISIBLE)
  66         ino_t           d_ino;          /* file number of entry */
  67 #else
  68         ino_t           d_fileno;       /* file number of entry */
  69 #endif
  70         uint16_t        d_namlen;       /* strlen(d_name) */
  71         uint8_t         d_type;         /* file type, see blow */
  72         uint8_t         d_unused1;      /* padding, reserved */
  73         uint32_t        d_unused2;      /* reserved */
  74         char            d_name[255 + 1];
  75                                         /* name, NUL-terminated */
  76 };
  77
  78 /*
  79  * Linux compatibility, but its a good idea anyhow
  80  */
  81 #define _DIRENT_HAVE_D_NAMLEN
  82 #define _DIRENT_HAVE_D_TYPE
  83
  84 #if !defined(_KERNEL) && defined(__BSD_VISIBLE)
  85 #define d_ino           d_fileno
  86 #endif
  87
  88 /*
  89  * File types
  90  */
  91 #define DT_UNKNOWN       0
  92 #define DT_FIFO          1
  93 #define DT_CHR           2
  94 #define DT_DIR           4
  95 #define DT_BLK           6
  96 #define DT_REG           8
  97 #define DT_LNK          10
  98 #define DT_SOCK         12
  99 #define DT_WHT          14
 100 #define DT_DBF          15      /* database record file */
 101
 102 /*
 103  * The _DIRENT_DIRSIZ macro gives the minimum record length which will hold
 104  * the directory entry.  This requires the amount of space in struct direct
 105  * without the d_name field, plus enough space for the name with a terminating
 106  * null byte (dp->d_namlen+1), rounded up to an 8 byte boundary.
 107  *
 108  * The _DIRENT_MINSIZ macro gives space needed for the directory entry without
 109  * the padding _DIRENT_DIRSIZ adds at the end.
 110  */
 111 #define _DIRENT_MINSIZ(dp) \
 112         (__offsetof(struct dirent, d_name) + (dp)->d_namlen + 1)
 113 #define _DIRENT_RECLEN(namelen) \
 114         ((__offsetof(struct dirent, d_name) + (namelen) + 1 + 7) & ~7)
 115 #define _DIRENT_DIRSIZ(dp)      _DIRENT_RECLEN((dp)->d_namlen)
 116 #define _DIRENT_NEXT(dp) \
 117         ((struct dirent *)((uint8_t *)(dp) + _DIRENT_DIRSIZ(dp)))
 118
 119 #endif /* !_SYS_DIRENT_H_ */