blob: 141121c5e8e8e70b7d15994bd8686931079d6be7 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
|
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright (c) 1998 by Sun Microsystems, Inc.
*/
#ifndef _CACHE_DOT_H
#define _CACHE_DOT_H
#pragma ident "%Z%%M% %I% %E% SMI"
/*
* ld.so directory caching
*/
#include <sys/types.h>
/*
* Shared object lookup performance in the run-time link editor is
* enhanced through the use of caches for directories that the editor
* searches. A given "cache" describes the contents of a single directory,
* and each cache entry contains the canonical name for a shared object
* as well as its absolute pathname.
*
* Within a cache, "pointers" are really relative addresses to some absolute
* address (often the base address of the containing database).
*/
/*
* Relative pointer macros.
*/
#define RELPTR(base, absptr) ((long)(absptr) - (long)(base))
#define AP(base) ((caddr_t)base)
/*
* Definitions for cache structures.
*/
#define DB_HASH 11 /* number of hash buckets in caches */
#define LD_CACHE_MAGIC 0x041155 /* cookie to identify data structure */
#define LD_CACHE_VERSION 0 /* version number of cache structure */
struct dbe { /* element of a directory cache */
long dbe_next; /* (rp) next element on this list */
long dbe_lop; /* (rp) canonical name for object */
long dbe_name; /* (rp) absolute name */
};
struct db { /* directory cache database */
long db_name; /* (rp) directory contained here */
struct dbe db_hash[DB_HASH]; /* hash buckets */
caddr_t db_chain; /* private to database mapping */
};
struct dbf { /* cache file image */
long dbf_magic; /* identifying cookie */
long dbf_version; /* version no. of these dbs */
long dbf_machtype; /* machine type */
long dbf_db; /* directory cache dbs */
};
/*
* Structures used to describe and access a database.
*/
struct dbd { /* data base descriptor */
struct dbd *dbd_next; /* next one on this list */
struct db *dbd_db; /* data base described by this */
};
struct dd { /* directory descriptor */
struct dd *dd_next; /* next one on this list */
struct db *dd_db; /* data base described by this */
};
/*
* Interfaces imported/exported by the lookup code.
*/
char *ask_db(); /* ask db for highest minor number */
struct db *lo_cache(); /* obtain cache for directory name */
#endif
|
