The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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

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    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  * 4. 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: releng/10.0/sys/sys/dirent.h 161347 2006-08-16 09:34:56Z maxim $
   31  */
   32 
   33 #ifndef _SYS_DIRENT_H_
   34 #define _SYS_DIRENT_H_
   35 
   36 #include <sys/cdefs.h>
   37 #include <sys/_types.h>
   38 
   39 /*
   40  * The dirent structure defines the format of directory entries returned by
   41  * the getdirentries(2) system call.
   42  *
   43  * A directory entry has a struct dirent at the front of it, containing its
   44  * inode number, the length of the entry, and the length of the name
   45  * contained in the entry.  These are followed by the name padded to a 4
   46  * byte boundary with null bytes.  All names are guaranteed null terminated.
   47  * The maximum length of a name in a directory is MAXNAMLEN.
   48  */
   49 
   50 struct dirent {
   51         __uint32_t d_fileno;            /* file number of entry */
   52         __uint16_t d_reclen;            /* length of this record */
   53         __uint8_t  d_type;              /* file type, see below */
   54         __uint8_t  d_namlen;            /* length of string in d_name */
   55 #if __BSD_VISIBLE
   56 #define MAXNAMLEN       255
   57         char    d_name[MAXNAMLEN + 1];  /* name must be no longer than this */
   58 #else
   59         char    d_name[255 + 1];        /* name must be no longer than this */
   60 #endif
   61 };
   62 
   63 #if __BSD_VISIBLE
   64 /*
   65  * File types
   66  */
   67 #define DT_UNKNOWN       0
   68 #define DT_FIFO          1
   69 #define DT_CHR           2
   70 #define DT_DIR           4
   71 #define DT_BLK           6
   72 #define DT_REG           8
   73 #define DT_LNK          10
   74 #define DT_SOCK         12
   75 #define DT_WHT          14
   76 
   77 /*
   78  * Convert between stat structure types and directory types.
   79  */
   80 #define IFTODT(mode)    (((mode) & 0170000) >> 12)
   81 #define DTTOIF(dirtype) ((dirtype) << 12)
   82 
   83 /*
   84  * The _GENERIC_DIRSIZ macro gives the minimum record length which will hold
   85  * the directory entry.  This returns the amount of space in struct direct
   86  * without the d_name field, plus enough space for the name with a terminating
   87  * null byte (dp->d_namlen+1), rounded up to a 4 byte boundary.
   88  *
   89  * XXX although this macro is in the implementation namespace, it requires
   90  * a manifest constant that is not.
   91  */
   92 #define _GENERIC_DIRSIZ(dp) \
   93     ((sizeof (struct dirent) - (MAXNAMLEN+1)) + (((dp)->d_namlen+1 + 3) &~ 3))
   94 #endif /* __BSD_VISIBLE */
   95 
   96 #ifdef _KERNEL
   97 #define GENERIC_DIRSIZ(dp)      _GENERIC_DIRSIZ(dp)
   98 #endif
   99 
  100 #endif /* !_SYS_DIRENT_H_ */

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