1 /* $OpenBSD: db.c,v 1.4 2017/01/21 08:18:53 krw Exp $ */
2
3 /*-
4 * Copyright (c) 1991, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 #include <sys/types.h>
33
34 #include <errno.h>
35 #include <fcntl.h>
36 #include <stddef.h>
37 #include <stdio.h>
38
39 #include <db.h>
40
41 static int __dberr(void);
42
43 DB *
dbopen(const char * fname,int flags,int mode,DBTYPE type,const void * openinfo)44 dbopen(const char *fname, int flags, int mode, DBTYPE type,
45 const void *openinfo)
46 {
47
48 #define DB_FLAGS (DB_LOCK | DB_SHMEM | DB_TXN)
49 #define USE_OPEN_FLAGS \
50 (O_CREAT | O_EXCL | O_EXLOCK | O_NOFOLLOW | O_NONBLOCK | \
51 O_RDONLY | O_RDWR | O_SHLOCK | O_SYNC | O_TRUNC)
52
53 if ((flags & ~(USE_OPEN_FLAGS | DB_FLAGS)) == 0)
54 switch (type) {
55 case DB_HASH:
56 return (__hash_open(fname, flags & USE_OPEN_FLAGS,
57 mode, openinfo, flags & DB_FLAGS));
58 default:
59 break;
60 }
61 errno = EINVAL;
62 return (NULL);
63 }
64 DEF_WEAK(dbopen);
65
66 static int
__dberr(void)67 __dberr(void)
68 {
69 return (RET_ERROR);
70 }
71
72 /*
73 * __DBPANIC -- Stop.
74 *
75 * Parameters:
76 * dbp: pointer to the DB structure.
77 */
78 void
__dbpanic(DB * dbp)79 __dbpanic(DB *dbp)
80 {
81 /* The only thing that can succeed is a close. */
82 dbp->del = (int (*)(const struct __db *, const DBT*, u_int))__dberr;
83 dbp->fd = (int (*)(const struct __db *))__dberr;
84 dbp->get = (int (*)(const struct __db *, const DBT*, DBT *, u_int))__dberr;
85 dbp->put = (int (*)(const struct __db *, DBT *, const DBT *, u_int))__dberr;
86 dbp->seq = (int (*)(const struct __db *, DBT *, DBT *, u_int))__dberr;
87 dbp->sync = (int (*)(const struct __db *, u_int))__dberr;
88 }
89