FreeBSD/Linux Kernel Cross Reference
sys/sys/dirent.h

     /*-
      * 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. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *      This product includes software developed by the University of
     *      California, Berkeley and its contributors.
     * 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.
     *
     *      @(#)dirent.h    8.3 (Berkeley) 8/10/94
     * $FreeBSD: src/sys/sys/dirent.h,v 1.11 1999/12/29 04:24:39 peter Exp $
     * $DragonFly: src/sys/sys/dirent.h,v 1.7 2007/11/20 21:03:46 dillon Exp $
     */
    
    #ifndef _SYS_DIRENT_H_
    #define _SYS_DIRENT_H_
    
    /*
     * The dirent structure defines the format of directory entries returned by
     * the getdirentries(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 a 8
     * byte boundary with null bytes.  All names are guaranteed null terminated.
     */
    
    /*
     * XXX Temporary bandaids to keep changes small:
     * XXX - for userland programs which don't specify any C or POSIX options,
     * XXX   keep the old d_fileno and map d_ino via macro.  Everything else gets
     * XXX   the POSIX d_ino and only that.
     * XXX - d_name is declared with the current maximum directory entry length,
     * XXX   instead of being incomplete. Code must allocate space for the
     * XXX   directory itself.
     */
    
    #include <sys/cdefs.h>
    #include <sys/types.h>
    
    struct dirent {
    #if defined(_KERNEL) || !defined(__BSD_VISIBLE)
            ino_t           d_ino;          /* file number of entry */
    #else
            ino_t           d_fileno;       /* file number of entry */
    #endif
            uint16_t        d_namlen;       /* strlen(d_name) */
            uint8_t         d_type;         /* file type, see blow */
            uint8_t         d_unused1;      /* padding, reserved */
            uint32_t        d_unused2;      /* reserved */
            char            d_name[255 + 1];
                                            /* name, NUL-terminated */
    };
    
    /*
     * Linux compatibility, but its a good idea anyhow
     */
    #define _DIRENT_HAVE_D_NAMLEN
    #define _DIRENT_HAVE_D_TYPE
    
    #if !defined(_KERNEL) && defined(__BSD_VISIBLE)
    #define d_ino           d_fileno
    #endif
    
    /*
     * 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
   #define DT_DBF          15      /* database record file */
   
   /*
    * The _DIRENT_DIRSIZ macro gives the minimum record length which will hold
    * the directory entry.  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 (dp->d_namlen+1), rounded up to an 8 byte boundary.
    *
    * The _DIRENT_MINSIZ macro gives space needed for the directory entry without
    * the padding _DIRENT_DIRSIZ adds at the end.
    */
   #define _DIRENT_MINSIZ(dp) \
           (__offsetof(struct dirent, d_name) + (dp)->d_namlen + 1)
   #define _DIRENT_RECLEN(namelen) \
           ((__offsetof(struct dirent, d_name) + (namelen) + 1 + 7) & ~7)
   #define _DIRENT_DIRSIZ(dp)      _DIRENT_RECLEN((dp)->d_namlen)
   #define _DIRENT_NEXT(dp) \
           ((struct dirent *)((uint8_t *)(dp) + _DIRENT_DIRSIZ(dp)))
   
   #endif /* !_SYS_DIRENT_H_ */

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