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
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
|
/*-
* Copyright (c) 1991, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. ***REMOVED*** - see
* ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)db.c 8.4 (Berkeley) 2/21/94";
#endif /* LIBC_SCCS and not lint */
#ifndef __DBINTERFACE_PRIVATE
#define __DBINTERFACE_PRIVATE
#endif
#ifdef macintosh
#include <unix.h>
#else
#include <sys/types.h>
#endif
#include <errno.h>
#include <fcntl.h>
#include <stddef.h>
#include <stdio.h>
#include "mcom_db.h"
/* a global flag that locks closed all databases */
int all_databases_locked_closed = 0;
/* set or unset a global lock flag to disable the
* opening of any DBM file
*/
void
dbSetOrClearDBLock(DBLockFlagEnum type)
{
if(type == LockOutDatabase)
all_databases_locked_closed = 1;
else
all_databases_locked_closed = 0;
}
DB *
dbopen(const char *fname, int flags,int mode, DBTYPE type, const void *openinfo)
{
/* lock out all file databases. Let in-memory databases through
*/
if(all_databases_locked_closed && fname)
{
errno = EINVAL;
return(NULL);
}
#define DB_FLAGS (DB_LOCK | DB_SHMEM | DB_TXN)
#if 0 /* most systems don't have EXLOCK and SHLOCK */
#define USE_OPEN_FLAGS \
(O_CREAT | O_EXCL | O_EXLOCK | O_NONBLOCK | O_RDONLY | \
O_RDWR | O_SHLOCK | O_TRUNC)
#else
#define USE_OPEN_FLAGS \
(O_CREAT | O_EXCL | O_RDONLY | \
O_RDWR | O_TRUNC)
#endif
if ((flags & ~(USE_OPEN_FLAGS | DB_FLAGS)) == 0)
switch (type) {
/* we don't need btree and recno right now */
#if 0
case DB_BTREE:
return (__bt_open(fname, flags & USE_OPEN_FLAGS,
mode, openinfo, flags & DB_FLAGS));
case DB_RECNO:
return (__rec_open(fname, flags & USE_OPEN_FLAGS,
mode, openinfo, flags & DB_FLAGS));
#endif
case DB_HASH:
return (__hash_open(fname, flags & USE_OPEN_FLAGS,
mode, (const HASHINFO *)openinfo, flags & DB_FLAGS));
default:
break;
}
errno = EINVAL;
return (NULL);
}
static int
__dberr()
{
return (RET_ERROR);
}
/*
* __DBPANIC -- Stop.
*
* Parameters:
* dbp: pointer to the DB structure.
*/
void
__dbpanic(DB *dbp)
{
/* The only thing that can succeed is a close. */
dbp->del = (int (*)(const struct __db *, const DBT *, uint))__dberr;
dbp->fd = (int (*)(const struct __db *))__dberr;
dbp->get = (int (*)(const struct __db *, const DBT *, DBT *, uint))__dberr;
dbp->put = (int (*)(const struct __db *, DBT *, const DBT *, uint))__dberr;
dbp->seq = (int (*)(const struct __db *, DBT *, DBT *, uint))__dberr;
dbp->sync = (int (*)(const struct __db *, uint))__dberr;
}
|
