/* * This source code is a product of Sun Microsystems, Inc. and is provided * for unrestricted use provided that this legend is included on all tape * media and as a part of the software program in whole or part. Users * may copy or modify this source code without charge, but are not authorized * to license or distribute it to anyone else except as part of a product or * program developed by the user. * * THIS PROGRAM CONTAINS SOURCE CODE COPYRIGHTED BY SUN MICROSYSTEMS, INC. * SUN MICROSYSTEMS, INC., MAKES NO REPRESENTATIONS ABOUT THE SUITABLITY * OF SUCH SOURCE CODE FOR ANY PURPOSE. IT IS PROVIDED "AS IS" WITHOUT * EXPRESS OR IMPLIED WARRANTY OF ANY KIND. SUN MICROSYSTEMS, INC. DISCLAIMS * ALL WARRANTIES WITH REGARD TO SUCH SOURCE CODE, INCLUDING ALL IMPLIED * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN * NO EVENT SHALL SUN MICROSYSTEMS, INC. BE LIABLE FOR ANY SPECIAL, INDIRECT, * INCIDENTAL, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING * FROM USE OF SUCH SOURCE CODE, REGARDLESS OF THE THEORY OF LIABILITY. * * This source code is provided with no support and without any obligation on * the part of Sun Microsystems, Inc. to assist in its use, correction, * modification or enhancement. * * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY THIS * SOURCE CODE OR ANY PART THEREOF. * * Sun Microsystems, Inc. * 2550 Garcia Avenue * Mountain View, California 94043 */ /* @(#)cache.h 1.4 69/12/31 SMI */ /* * ld.so directory caching */ /* * Copyright (c) 1987, 1991 by Sun Microsystems, Inc. */ /* * 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). */ #define CACHE_FILE "/etc/ld.so.cache" /* file where it is stored */ /* * 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. */ caddr_t (*db_malloc)(); /* allocator for relative objects */ caddr_t (*heap_malloc)(); /* allocator for general objects */ int (*is_secure)(); /* tells whether censorship in force */ extern int use_cache; /* use existing cache? */ extern caddr_t db_base; char *lo_lookup(/* lop, lmp */); /* name for link_object */ struct db *lo_cache(/* cp */); /* obtain cache for directory name */ void lo_flush(); /* foreach dir get a new database */ void dbd_flush(); /* delete the dbs that came from ld.so.cache */