db.h (7897B) - Raw
1 /*- 2 * Copyright (c) 1990, 1993, 1994 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 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#)db.h 8.7 (Berkeley) 6/16/94 34 * $FreeBSD: src/include/db.h,v 1.5 2002/03/26 01:35:05 bde Exp $ 35 */ 36 37 #ifndef _DB_H_ 38 #define _DB_H_ 39 40 #include <sys/types.h> 41 #include <sys/cdefs.h> 42 43 #include <limits.h> 44 45 #define RET_ERROR -1 /* Return values. */ 46 #define RET_SUCCESS 0 47 #define RET_SPECIAL 1 48 49 #define MAX_PAGE_NUMBER 0xffffffff /* >= # of pages in a file */ 50 typedef u_int32_t pgno_t; 51 #define MAX_PAGE_OFFSET 65535 /* >= # of bytes in a page */ 52 typedef u_int16_t indx_t; 53 #define MAX_REC_NUMBER 0xffffffff /* >= # of records in a tree */ 54 typedef u_int32_t recno_t; 55 56 /* Key/data structure -- a Data-Base Thang. */ 57 typedef struct { 58 void *data; /* data */ 59 size_t size; /* data length */ 60 } DBT; 61 62 /* Routine flags. */ 63 #define R_CURSOR 1 /* del, put, seq */ 64 #define __R_UNUSED 2 /* UNUSED */ 65 #define R_FIRST 3 /* seq */ 66 #define R_IAFTER 4 /* put (RECNO) */ 67 #define R_IBEFORE 5 /* put (RECNO) */ 68 #define R_LAST 6 /* seq (BTREE, RECNO) */ 69 #define R_NEXT 7 /* seq */ 70 #define R_NOOVERWRITE 8 /* put */ 71 #define R_PREV 9 /* seq (BTREE, RECNO) */ 72 #define R_SETCURSOR 10 /* put (RECNO) */ 73 #define R_RECNOSYNC 11 /* sync (RECNO) */ 74 75 typedef enum { DB_BTREE, DB_HASH, DB_RECNO } DBTYPE; 76 77 /* 78 * !!! 79 * The following flags are included in the dbopen(3) call as part of the 80 * open(2) flags. In order to avoid conflicts with the open flags, start 81 * at the top of the 16 or 32-bit number space and work our way down. If 82 * the open flags were significantly expanded in the future, it could be 83 * a problem. Wish I'd left another flags word in the dbopen call. 84 * 85 * !!! 86 * None of this stuff is implemented yet. The only reason that it's here 87 * is so that the access methods can skip copying the key/data pair when 88 * the DB_LOCK flag isn't set. 89 */ 90 #if UINT_MAX > 65535 91 #define DB_LOCK 0x20000000 /* Do locking. */ 92 #define DB_SHMEM 0x40000000 /* Use shared memory. */ 93 #define DB_TXN 0x80000000 /* Do transactions. */ 94 #else 95 #define DB_LOCK 0x2000 /* Do locking. */ 96 #define DB_SHMEM 0x4000 /* Use shared memory. */ 97 #define DB_TXN 0x8000 /* Do transactions. */ 98 #endif 99 100 /* Access method description structure. */ 101 typedef struct __db { 102 DBTYPE type; /* Underlying db type. */ 103 int (*close)(struct __db *); 104 int (*del)(const struct __db *, const DBT *, unsigned int); 105 int (*get)(const struct __db *, const DBT *, DBT *, unsigned int); 106 int (*put)(const struct __db *, DBT *, const DBT *, unsigned int); 107 int (*seq)(const struct __db *, DBT *, DBT *, unsigned int); 108 int (*sync)(const struct __db *, unsigned int); 109 void *internal; /* Access method private. */ 110 int (*fd)(const struct __db *); 111 } DB; 112 113 #define BTREEMAGIC 0x053162 114 #define BTREEVERSION 3 115 116 /* Structure used to pass parameters to the btree routines. */ 117 typedef struct { 118 #define R_DUP 0x01 /* duplicate keys */ 119 unsigned long flags; 120 unsigned int cachesize; /* bytes to cache */ 121 int maxkeypage; /* maximum keys per page */ 122 int minkeypage; /* minimum keys per page */ 123 unsigned int psize; /* page size */ 124 int (*compare) /* comparison function */ 125 (const DBT *, const DBT *); 126 size_t (*prefix) /* prefix function */ 127 (const DBT *, const DBT *); 128 int lorder; /* byte order */ 129 } BTREEINFO; 130 131 #define HASHMAGIC 0x061561 132 #define HASHVERSION 2 133 134 /* Structure used to pass parameters to the hashing routines. */ 135 typedef struct { 136 unsigned int bsize; /* bucket size */ 137 unsigned int ffactor; /* fill factor */ 138 unsigned int nelem; /* number of elements */ 139 unsigned int cachesize; /* bytes to cache */ 140 u_int32_t /* hash function */ 141 (*hash)(const void *, size_t); 142 int lorder; /* byte order */ 143 } HASHINFO; 144 145 /* Structure used to pass parameters to the record routines. */ 146 typedef struct { 147 #define R_FIXEDLEN 0x01 /* fixed-length records */ 148 #define R_NOKEY 0x02 /* key not required */ 149 #define R_SNAPSHOT 0x04 /* snapshot the input */ 150 unsigned long flags; 151 unsigned int cachesize; /* bytes to cache */ 152 unsigned int psize; /* page size */ 153 int lorder; /* byte order */ 154 size_t reclen; /* record length (fixed-length records) */ 155 unsigned char bval; /* delimiting byte (variable-length records */ 156 char *bfname; /* btree file name */ 157 } RECNOINFO; 158 159 #ifdef __DBINTERFACE_PRIVATE 160 /* 161 * Little endian <==> big endian 32-bit swap macros. 162 * M_32_SWAP swap a memory location 163 * P_32_SWAP swap a referenced memory location 164 * P_32_COPY swap from one location to another 165 */ 166 #define M_32_SWAP(a) { \ 167 u_int32_t _tmp = a; \ 168 ((char *)&a)[0] = ((char *)&_tmp)[3]; \ 169 ((char *)&a)[1] = ((char *)&_tmp)[2]; \ 170 ((char *)&a)[2] = ((char *)&_tmp)[1]; \ 171 ((char *)&a)[3] = ((char *)&_tmp)[0]; \ 172 } 173 #define P_32_SWAP(a) { \ 174 u_int32_t _tmp = *(u_int32_t *)a; \ 175 ((char *)a)[0] = ((char *)&_tmp)[3]; \ 176 ((char *)a)[1] = ((char *)&_tmp)[2]; \ 177 ((char *)a)[2] = ((char *)&_tmp)[1]; \ 178 ((char *)a)[3] = ((char *)&_tmp)[0]; \ 179 } 180 #define P_32_COPY(a, b) { \ 181 ((char *)&(b))[0] = ((char *)&(a))[3]; \ 182 ((char *)&(b))[1] = ((char *)&(a))[2]; \ 183 ((char *)&(b))[2] = ((char *)&(a))[1]; \ 184 ((char *)&(b))[3] = ((char *)&(a))[0]; \ 185 } 186 187 /* 188 * Little endian <==> big endian 16-bit swap macros. 189 * M_16_SWAP swap a memory location 190 * P_16_SWAP swap a referenced memory location 191 * P_16_COPY swap from one location to another 192 */ 193 #define M_16_SWAP(a) { \ 194 u_int16_t _tmp = a; \ 195 ((char *)&a)[0] = ((char *)&_tmp)[1]; \ 196 ((char *)&a)[1] = ((char *)&_tmp)[0]; \ 197 } 198 #define P_16_SWAP(a) { \ 199 u_int16_t _tmp = *(u_int16_t *)a; \ 200 ((char *)a)[0] = ((char *)&_tmp)[1]; \ 201 ((char *)a)[1] = ((char *)&_tmp)[0]; \ 202 } 203 #define P_16_COPY(a, b) { \ 204 ((char *)&(b))[0] = ((char *)&(a))[1]; \ 205 ((char *)&(b))[1] = ((char *)&(a))[0]; \ 206 } 207 #endif 208 209 __BEGIN_DECLS 210 DB *dbopen(const char *, int, int, DBTYPE, const void *); 211 212 #ifdef __DBINTERFACE_PRIVATE 213 DB *__bt_open(const char *, int, int, const BTREEINFO *, int); 214 DB *__hash_open(const char *, int, int, const HASHINFO *, int); 215 DB *__rec_open(const char *, int, int, const RECNOINFO *, int); 216 void __dbpanic(DB *dbp); 217 #endif 218 __END_DECLS 219 #endif /* !_DB_H_ */