1/*	$OpenBSD: db.c,v 1.13 2015/09/05 11:28:35 guenther 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
41static int __dberr(void);
42
43DB *
44dbopen(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_ACCMODE | O_SHLOCK | O_SYNC | O_TRUNC)
52
53	if (((flags & O_ACCMODE) == O_RDONLY || (flags & O_ACCMODE) == O_RDWR)
54	    && (flags & ~(USE_OPEN_FLAGS | DB_FLAGS)) == 0)
55		switch (type) {
56		case DB_BTREE:
57			return (__bt_open(fname, flags & USE_OPEN_FLAGS,
58			    mode, openinfo, flags & DB_FLAGS));
59		case DB_HASH:
60			return (__hash_open(fname, flags & USE_OPEN_FLAGS,
61			    mode, openinfo, flags & DB_FLAGS));
62		case DB_RECNO:
63			return (__rec_open(fname, flags & USE_OPEN_FLAGS,
64			    mode, openinfo, flags & DB_FLAGS));
65		}
66	errno = EINVAL;
67	return (NULL);
68}
69DEF_WEAK(dbopen);
70
71static int
72__dberr(void)
73{
74	return (RET_ERROR);
75}
76
77/*
78 * __DBPANIC -- Stop.
79 *
80 * Parameters:
81 *	dbp:	pointer to the DB structure.
82 */
83void
84__dbpanic(DB *dbp)
85{
86	/* The only thing that can succeed is a close. */
87	dbp->del = (int (*)(const struct __db *, const DBT*, u_int))__dberr;
88	dbp->fd = (int (*)(const struct __db *))__dberr;
89	dbp->get = (int (*)(const struct __db *, const DBT*, DBT *, u_int))__dberr;
90	dbp->put = (int (*)(const struct __db *, DBT *, const DBT *, u_int))__dberr;
91	dbp->seq = (int (*)(const struct __db *, DBT *, DBT *, u_int))__dberr;
92	dbp->sync = (int (*)(const struct __db *, u_int))__dberr;
93}
94