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 #include <sys/types.h>
38 /* For sig_atomic_t. */
41 #include <ccan/compiler/compiler.h>
43 /* flags to tdb_store() */
44 #define TDB_REPLACE 1 /* Unused */
45 #define TDB_INSERT 2 /* Don't overwrite an existing entry */
46 #define TDB_MODIFY 3 /* Don't create an existing entry */
48 /* flags for tdb_open() */
49 #define TDB_DEFAULT 0 /* just a readability place holder */
50 #define TDB_CLEAR_IF_FIRST 1
51 #define TDB_INTERNAL 2 /* don't store on disk */
52 #define TDB_NOLOCK 4 /* don't do any locking */
53 #define TDB_NOMMAP 8 /* don't use mmap */
54 #define TDB_CONVERT 16 /* convert endian (internal use) */
55 #define TDB_BIGENDIAN 32 /* header is big-endian (internal use) */
56 #define TDB_NOSYNC 64 /* don't use synchronous transactions */
57 #define TDB_SEQNUM 128 /* maintain a sequence number */
58 #define TDB_VOLATILE 256 /* Activate the per-hashchain freelist, default 5 */
59 #define TDB_ALLOW_NESTING 512 /* Allow transactions to nest */
60 #define TDB_DISALLOW_NESTING 1024 /* Disallow transactions to nest */
61 #define TDB_INCOMPATIBLE_HASH 2048 /* Better hashing: can't be opened by older tdb versions. */
64 enum TDB_ERROR {TDB_SUCCESS=0, TDB_ERR_CORRUPT, TDB_ERR_IO, TDB_ERR_LOCK,
65 TDB_ERR_OOM, TDB_ERR_EXISTS, TDB_ERR_NOLOCK, TDB_ERR_LOCK_TIMEOUT,
66 TDB_ERR_NOEXIST, TDB_ERR_EINVAL, TDB_ERR_RDONLY,
69 /* flags for tdb_summary. Logical or to combine. */
70 enum tdb_summary_flags { TDB_SUMMARY_HISTOGRAMS = 1 };
72 /* debugging uses one of the following levels */
73 enum tdb_debug_level {TDB_DEBUG_FATAL = 0, TDB_DEBUG_ERROR,
74 TDB_DEBUG_WARNING, TDB_DEBUG_TRACE};
76 typedef struct TDB_DATA {
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_FMT(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_prepare_commit(struct tdb_context *tdb);
134 int tdb_transaction_commit(struct tdb_context *tdb);
135 int tdb_transaction_cancel(struct tdb_context *tdb);
136 int tdb_transaction_recover(struct tdb_context *tdb);
137 int tdb_get_seqnum(struct tdb_context *tdb);
138 int tdb_hash_size(struct tdb_context *tdb);
139 size_t tdb_map_size(struct tdb_context *tdb);
140 int tdb_get_flags(struct tdb_context *tdb);
141 void tdb_add_flags(struct tdb_context *tdb, unsigned flag);
142 void tdb_remove_flags(struct tdb_context *tdb, unsigned flag);
143 void tdb_enable_seqnum(struct tdb_context *tdb);
144 void tdb_increment_seqnum_nonblock(struct tdb_context *tdb);
145 unsigned int tdb_jenkins_hash(TDB_DATA *key);
146 int tdb_check(struct tdb_context *tdb,
147 int (*check)(TDB_DATA key, TDB_DATA data, void *private),
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);
170 char *tdb_summary(struct tdb_context *tdb, enum tdb_summary_flags flags);
172 extern TDB_DATA tdb_null;