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