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 2 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, write to the Free Software
27 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
35 /* flags to tdb_store() */
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 */
51 #define TDB_ERRCODE(code, ret) ((tdb->ecode = (code)), ret)
54 enum TDB_ERROR {TDB_SUCCESS=0, TDB_ERR_CORRUPT, TDB_ERR_IO, TDB_ERR_LOCK,
55 TDB_ERR_OOM, TDB_ERR_EXISTS, TDB_ERR_NOLOCK, TDB_ERR_LOCK_TIMEOUT,
56 TDB_ERR_NOEXIST, TDB_ERR_EINVAL, TDB_ERR_RDONLY};
58 /* debugging uses one of the following levels */
59 enum tdb_debug_level {TDB_DEBUG_FATAL = 0, TDB_DEBUG_ERROR,
60 TDB_DEBUG_WARNING, TDB_DEBUG_TRACE};
62 typedef struct TDB_DATA {
67 #ifndef PRINTF_ATTRIBUTE
69 /** Use gcc attribute to check printf fns. a1 is the 1-based index of
70 * the parameter containing the format, and a2 the index of the first
71 * argument. Note that some gcc 2.x versions don't handle this
73 #define PRINTF_ATTRIBUTE(a1, a2) __attribute__ ((format (__printf__, a1, a2)))
75 #define PRINTF_ATTRIBUTE(a1, a2)
79 /* this is the context structure that is returned from a db open */
80 typedef struct tdb_context TDB_CONTEXT;
82 typedef int (*tdb_traverse_func)(struct tdb_context *, TDB_DATA, TDB_DATA, void *);
83 typedef void (*tdb_log_func)(struct tdb_context *, enum tdb_debug_level, const char *, ...) PRINTF_ATTRIBUTE(3, 4);
84 typedef unsigned int (*tdb_hash_func)(TDB_DATA *key);
86 struct tdb_logging_context {
91 struct tdb_context *tdb_open(const char *name, int hash_size, int tdb_flags,
92 int open_flags, mode_t mode);
93 struct tdb_context *tdb_open_ex(const char *name, int hash_size, int tdb_flags,
94 int open_flags, mode_t mode,
95 const struct tdb_logging_context *log_ctx,
96 tdb_hash_func hash_fn);
98 int tdb_reopen(struct tdb_context *tdb);
99 int tdb_reopen_all(int parent_longlived);
100 void tdb_set_logging_function(struct tdb_context *tdb, const struct tdb_logging_context *log);
101 enum TDB_ERROR tdb_error(struct tdb_context *tdb);
102 const char *tdb_errorstr(struct tdb_context *tdb);
103 TDB_DATA tdb_fetch(struct tdb_context *tdb, TDB_DATA key);
104 int tdb_delete(struct tdb_context *tdb, TDB_DATA key);
105 int tdb_store(struct tdb_context *tdb, TDB_DATA key, TDB_DATA dbuf, int flag);
106 int tdb_append(struct tdb_context *tdb, TDB_DATA key, TDB_DATA new_dbuf);
107 int tdb_close(struct tdb_context *tdb);
108 TDB_DATA tdb_firstkey(struct tdb_context *tdb);
109 TDB_DATA tdb_nextkey(struct tdb_context *tdb, TDB_DATA key);
110 int tdb_traverse(struct tdb_context *tdb, tdb_traverse_func fn, void *);
111 int tdb_traverse_read(struct tdb_context *tdb, tdb_traverse_func fn, void *);
112 int tdb_exists(struct tdb_context *tdb, TDB_DATA key);
113 int tdb_lockall(struct tdb_context *tdb);
114 int tdb_unlockall(struct tdb_context *tdb);
115 int tdb_lockall_read(struct tdb_context *tdb);
116 int tdb_unlockall_read(struct tdb_context *tdb);
117 const char *tdb_name(struct tdb_context *tdb);
118 int tdb_fd(struct tdb_context *tdb);
119 tdb_log_func tdb_log_fn(struct tdb_context *tdb);
120 void *tdb_get_logging_private(struct tdb_context *tdb);
121 int tdb_transaction_start(struct tdb_context *tdb);
122 int tdb_transaction_commit(struct tdb_context *tdb);
123 int tdb_transaction_cancel(struct tdb_context *tdb);
124 int tdb_transaction_recover(struct tdb_context *tdb);
125 int tdb_get_seqnum(struct tdb_context *tdb);
127 /* Low level locking functions: use with care */
128 int tdb_chainlock(struct tdb_context *tdb, TDB_DATA key);
129 int tdb_chainunlock(struct tdb_context *tdb, TDB_DATA key);
130 int tdb_chainlock_read(struct tdb_context *tdb, TDB_DATA key);
131 int tdb_chainunlock_read(struct tdb_context *tdb, TDB_DATA key);
133 /* Debug functions. Not used in production. */
134 void tdb_dump_all(struct tdb_context *tdb);
135 int tdb_printfreelist(struct tdb_context *tdb);
137 extern TDB_DATA tdb_null;