5 Unix SMB/CIFS implementation.
7 trivial database library
9 Copyright (C) Andrew Tridgell 1999-2004
11 ** NOTE! The following LGPL license applies to the tdb
12 ** library. This does NOT imply that all of Samba is released
15 This library is free software; you can redistribute it and/or
16 modify it under the terms of the GNU Lesser General Public
17 License as published by the Free Software Foundation; either
18 version 3 of the License, or (at your option) any later version.
20 This library is distributed in the hope that it will be useful,
21 but WITHOUT ANY WARRANTY; without even the implied warranty of
22 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
23 Lesser General Public License for more details.
25 You should have received a copy of the GNU Lesser General Public
26 License along with this library; if not, see <http://www.gnu.org/licenses/>.
35 /* flags to tdb_store() */
36 #define TDB_REPLACE 1 /* Unused */
37 #define TDB_INSERT 2 /* Don't overwrite an existing entry */
38 #define TDB_MODIFY 3 /* Don't create an existing entry */
40 /* flags for tdb_open() */
41 #define TDB_DEFAULT 0 /* just a readability place holder */
42 #define TDB_CLEAR_IF_FIRST 1
43 #define TDB_INTERNAL 2 /* don't store on disk */
44 #define TDB_NOLOCK 4 /* don't do any locking */
45 #define TDB_NOMMAP 8 /* don't use mmap */
46 #define TDB_CONVERT 16 /* convert endian (internal use) */
47 #define TDB_BIGENDIAN 32 /* header is big-endian (internal use) */
48 #define TDB_NOSYNC 64 /* don't use synchronous transactions */
49 #define TDB_SEQNUM 128 /* maintain a sequence number */
50 #define TDB_VOLATILE 256 /* Activate the per-hashchain freelist, default 5 */
51 #define TDB_ALLOW_NESTING 512 /* Allow transactions to nest */
52 #define TDB_DISALLOW_NESTING 1024 /* Disallow transactions to nest */
55 enum TDB_ERROR
{TDB_SUCCESS
=0, TDB_ERR_CORRUPT
, TDB_ERR_IO
, TDB_ERR_LOCK
,
56 TDB_ERR_OOM
, TDB_ERR_EXISTS
, TDB_ERR_NOLOCK
, TDB_ERR_LOCK_TIMEOUT
,
57 TDB_ERR_NOEXIST
, TDB_ERR_EINVAL
, TDB_ERR_RDONLY
,
60 /* debugging uses one of the following levels */
61 enum tdb_debug_level
{TDB_DEBUG_FATAL
= 0, TDB_DEBUG_ERROR
,
62 TDB_DEBUG_WARNING
, TDB_DEBUG_TRACE
};
64 typedef struct TDB_DATA
{
69 #ifndef PRINTF_ATTRIBUTE
71 /** Use gcc attribute to check printf fns. a1 is the 1-based index of
72 * the parameter containing the format, and a2 the index of the first
73 * argument. Note that some gcc 2.x versions don't handle this
75 #define PRINTF_ATTRIBUTE(a1, a2) __attribute__ ((format (__printf__, a1, a2)))
77 #define PRINTF_ATTRIBUTE(a1, a2)
81 /* this is the context structure that is returned from a db open */
82 typedef struct tdb_context TDB_CONTEXT
;
84 typedef int (*tdb_traverse_func
)(struct tdb_context
*, TDB_DATA
, TDB_DATA
, void *);
85 typedef void (*tdb_log_func
)(struct tdb_context
*, enum tdb_debug_level
, const char *, ...) PRINTF_ATTRIBUTE(3, 4);
86 typedef unsigned int (*tdb_hash_func
)(TDB_DATA
*key
);
88 struct tdb_logging_context
{
93 struct tdb_context
*tdb_open(const char *name
, int hash_size
, int tdb_flags
,
94 int open_flags
, mode_t mode
);
95 struct tdb_context
*tdb_open_ex(const char *name
, int hash_size
, int tdb_flags
,
96 int open_flags
, mode_t mode
,
97 const struct tdb_logging_context
*log_ctx
,
98 tdb_hash_func hash_fn
);
99 void tdb_set_max_dead(struct tdb_context
*tdb
, int max_dead
);
101 int tdb_reopen(struct tdb_context
*tdb
);
102 int tdb_reopen_all(int parent_longlived
);
103 void tdb_set_logging_function(struct tdb_context
*tdb
, const struct tdb_logging_context
*log_ctx
);
104 enum TDB_ERROR
tdb_error(struct tdb_context
*tdb
);
105 const char *tdb_errorstr(struct tdb_context
*tdb
);
106 TDB_DATA
tdb_fetch(struct tdb_context
*tdb
, TDB_DATA key
);
107 int tdb_parse_record(struct tdb_context
*tdb
, TDB_DATA key
,
108 int (*parser
)(TDB_DATA key
, TDB_DATA data
,
111 int tdb_delete(struct tdb_context
*tdb
, TDB_DATA key
);
112 int tdb_store(struct tdb_context
*tdb
, TDB_DATA key
, TDB_DATA dbuf
, int flag
);
113 int tdb_append(struct tdb_context
*tdb
, TDB_DATA key
, TDB_DATA new_dbuf
);
114 int tdb_close(struct tdb_context
*tdb
);
115 TDB_DATA
tdb_firstkey(struct tdb_context
*tdb
);
116 TDB_DATA
tdb_nextkey(struct tdb_context
*tdb
, TDB_DATA key
);
117 int tdb_traverse(struct tdb_context
*tdb
, tdb_traverse_func fn
, void *);
118 int tdb_traverse_read(struct tdb_context
*tdb
, tdb_traverse_func fn
, void *);
119 int tdb_exists(struct tdb_context
*tdb
, TDB_DATA key
);
120 int tdb_lockall(struct tdb_context
*tdb
);
121 int tdb_lockall_nonblock(struct tdb_context
*tdb
);
122 int tdb_unlockall(struct tdb_context
*tdb
);
123 int tdb_lockall_read(struct tdb_context
*tdb
);
124 int tdb_lockall_read_nonblock(struct tdb_context
*tdb
);
125 int tdb_unlockall_read(struct tdb_context
*tdb
);
126 int tdb_lockall_mark(struct tdb_context
*tdb
);
127 int tdb_lockall_unmark(struct tdb_context
*tdb
);
128 const char *tdb_name(struct tdb_context
*tdb
);
129 int tdb_fd(struct tdb_context
*tdb
);
130 tdb_log_func
tdb_log_fn(struct tdb_context
*tdb
);
131 void *tdb_get_logging_private(struct tdb_context
*tdb
);
132 int tdb_transaction_start(struct tdb_context
*tdb
);
133 int tdb_transaction_start_nonblock(struct tdb_context
*tdb
);
134 int tdb_transaction_prepare_commit(struct tdb_context
*tdb
);
135 int tdb_transaction_commit(struct tdb_context
*tdb
);
136 int tdb_transaction_cancel(struct tdb_context
*tdb
);
137 int tdb_transaction_recover(struct tdb_context
*tdb
);
138 int tdb_get_seqnum(struct tdb_context
*tdb
);
139 int tdb_hash_size(struct tdb_context
*tdb
);
140 size_t tdb_map_size(struct tdb_context
*tdb
);
141 int tdb_get_flags(struct tdb_context
*tdb
);
142 void tdb_add_flags(struct tdb_context
*tdb
, unsigned flag
);
143 void tdb_remove_flags(struct tdb_context
*tdb
, unsigned flag
);
144 void tdb_enable_seqnum(struct tdb_context
*tdb
);
145 void tdb_increment_seqnum_nonblock(struct tdb_context
*tdb
);
146 int tdb_check(struct tdb_context
*tdb
,
147 int (*check
) (TDB_DATA key
, TDB_DATA data
, void *private_data
),
150 /* Low level locking functions: use with care */
151 int tdb_chainlock(struct tdb_context
*tdb
, TDB_DATA key
);
152 int tdb_chainlock_nonblock(struct tdb_context
*tdb
, TDB_DATA key
);
153 int tdb_chainunlock(struct tdb_context
*tdb
, TDB_DATA key
);
154 int tdb_chainlock_read(struct tdb_context
*tdb
, TDB_DATA key
);
155 int tdb_chainunlock_read(struct tdb_context
*tdb
, TDB_DATA key
);
156 int tdb_chainlock_mark(struct tdb_context
*tdb
, TDB_DATA key
);
157 int tdb_chainlock_unmark(struct tdb_context
*tdb
, TDB_DATA key
);
159 void tdb_setalarm_sigptr(struct tdb_context
*tdb
, volatile sig_atomic_t *sigptr
);
161 /* wipe and repack */
162 int tdb_wipe_all(struct tdb_context
*tdb
);
163 int tdb_repack(struct tdb_context
*tdb
);
165 /* Debug functions. Not used in production. */
166 void tdb_dump_all(struct tdb_context
*tdb
);
167 int tdb_printfreelist(struct tdb_context
*tdb
);
168 int tdb_validate_freelist(struct tdb_context
*tdb
, int *pnum_entries
);
169 int tdb_freelist_size(struct tdb_context
*tdb
);
171 extern TDB_DATA tdb_null
;