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1990-09-18
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head 1.4;
branch ;
access ;
symbols ;
locks ; strict;
comment @ * @;
1.4
date 90.09.18.17.20.44; author kupfer; state Exp;
branches ;
next 1.3;
1.3
date 89.07.14.09.15.19; author rab; state Exp;
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1.2
date 88.06.29.14.47.44; author ouster; state Exp;
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1.1
date 88.06.26.15.43.56; author ouster; state Exp;
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desc
@@
1.4
log
@include <sys/types.h> (to get u_long typedef).
@
text
@/*
* Copyright (c) 1982, 1986 Regents of the University of California.
* All rights reserved. The Berkeley software License Agreement
* specifies the terms and conditions for redistribution.
*
* @@(#)dir.h 7.2 (Berkeley) 12/22/86
*/
#ifndef _DIR
#define _DIR
#include <sys/types.h>
/*
* A directory consists of some number of blocks of DIRBLKSIZ
* bytes, where DIRBLKSIZ is chosen such that it can be transferred
* to disk in a single atomic operation (e.g. 512 bytes on most machines).
*
* Each DIRBLKSIZ byte block contains some number of directory entry
* structures, which are of variable length. Each directory entry has
* a struct direct 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.
*
* The macro DIRSIZ(dp) gives the amount of space required to represent
* a directory entry. Free space in a directory is represented by
* entries which have dp->d_reclen > DIRSIZ(dp). All DIRBLKSIZ bytes
* in a directory block are claimed by the directory entries. This
* usually results in the last entry in a directory having a large
* dp->d_reclen. When entries are deleted from a directory, the
* space is returned to the previous entry in the same directory
* block by increasing its dp->d_reclen. If the first entry of
* a directory block is free, then its dp->d_ino is set to 0.
* Entries other than the first in a directory do not normally have
* dp->d_ino set to 0.
*/
/* so user programs can just include dir.h */
#if !defined(KERNEL) && !defined(DEV_BSIZE)
#define DEV_BSIZE 512
#endif
#define DIRBLKSIZ DEV_BSIZE
#define MAXNAMLEN 255
struct direct {
u_long d_ino; /* inode number of entry */
u_short d_reclen; /* length of this record */
u_short d_namlen; /* length of string in d_name */
char d_name[MAXNAMLEN + 1]; /* name must be no longer than this */
};
/*
* The DIRSIZ macro gives the minimum record length which will hold
* the directory entry. This requires the amount of space in struct direct
* without the d_name field, plus enough space for the name with a terminating
* null byte (dp->d_namlen+1), rounded up to a 4 byte boundary.
*/
#undef DIRSIZ
#define DIRSIZ(dp) \
((sizeof (struct direct) - (MAXNAMLEN+1)) + (((dp)->d_namlen+1 + 3) &~ 3))
#ifndef KERNEL
/*
* Definitions for library routines operating on directories.
*/
typedef struct _dirdesc {
int dd_fd;
long dd_loc;
long dd_size;
char dd_buf[DIRBLKSIZ];
} DIR;
#define dirfd(dirp) ((dirp)->dd_fd)
#ifndef NULL
#define NULL 0
#endif
extern DIR *opendir();
extern struct direct *readdir();
extern long telldir();
extern void seekdir();
#define rewinddir(dirp) seekdir((dirp), (long)0)
extern void closedir();
#endif
#endif /* _DIR */
@
1.3
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@*** empty log message ***
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@d12 2
@
1.2
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@Add ifdefs to prevent files from being included multiple times.
@
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@d85 1
a85 1
#endif _DIR
@
1.1
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@Initial revision
@
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@d9 3
d85 1
a85 17
#ifdef KERNEL
/*
* Template for manipulating directories.
* Should use struct direct's, but the name field
* is MAXNAMLEN - 1, and this just won't do.
*/
struct dirtemplate {
u_long dot_ino;
short dot_reclen;
short dot_namlen;
char dot_name[4]; /* must be multiple of 4 */
u_long dotdot_ino;
short dotdot_reclen;
short dotdot_namlen;
char dotdot_name[4]; /* ditto */
};
#endif
@