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

     /*      $NetBSD: dirent.h,v 1.23 2005/12/26 18:41:36 perry 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/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 a 4
     * byte boundary with null bytes.  All names are guaranteed null 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
            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
    
    /*
     * 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
     */
    #define _DIRENT_NAMEOFF(dp) \
        ((char *)(void *)&(dp)->d_name - (char *)(void *)dp)
    /*
     * 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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