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

     /*      $OpenBSD: dirent.h,v 1.11 2013/12/13 18:09:27 zhuk Exp $        */
     /*      $NetBSD: dirent.h,v 1.12 1996/04/09 20:55:25 cgd 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>
    
    /*
     * 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 */
            __off_t    d_off;               /* offset after this entry */
            __uint16_t d_reclen;            /* length of this record */
            __uint8_t  d_type;              /* file type, see below */
            __uint8_t  d_namlen;            /* length of string in d_name */
            __uint8_t  __d_padding[4];      /* suppress padding after d_name */
    #if __BSD_VISIBLE
    #define MAXNAMLEN       255
            char    d_name[MAXNAMLEN + 1];  /* name must be no longer than this */
    #else
            char    d_name[255 + 1];        /* name must be no longer than this */
    #endif
    };
    
    #if __BSD_VISIBLE
    /*
     * 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
    
    /*
     * Convert between stat structure types and directory types.
     */
    #define IFTODT(mode)    (((mode) & 0170000) >> 12)
    #define DTTOIF(dirtype) ((dirtype) << 12)
    
    #ifdef _KERNEL
    /*
     * The DIRENT_RECSIZE macro gives the minimum record length which will hold
     * a directory entry with a name of the given length, including the terminating
     * nul byte, rounded up to proper alignment.
     * The DIRENT_SIZE macro does the same when given a pointer to a struct dirent
     */
    #define DIRENT_RECSIZE(namelen) \
        ((offsetof(struct dirent, d_name) + (namelen) + 1 + 7) &~ 7)
    #define DIRENT_SIZE(dp) \
        DIRENT_RECSIZE((dp)->d_namlen)
    #endif
    
    #endif /* __BSD_VISIBLE */
    
   #endif /* _SYS_DIRENT_H_ */

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