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) */
49 #define TDB_ERRCODE(code, ret) ((tdb->ecode = (code)), ret)
52 enum TDB_ERROR {TDB_SUCCESS=0, TDB_ERR_CORRUPT, TDB_ERR_IO, TDB_ERR_LOCK,
53 TDB_ERR_OOM, TDB_ERR_EXISTS, TDB_ERR_NOLOCK, TDB_ERR_LOCK_TIMEOUT,
60 typedef struct TDB_DATA {
68 /* this is stored at the front of every database */
70 char magic_food[32]; /* for /etc/magic */
71 u32 version; /* version of the code */
72 u32 hash_size; /* number of hash entries */
77 struct tdb_lock_type {
82 struct tdb_traverse_lock {
83 struct tdb_traverse_lock *next;
88 /* this is the context structure that is returned from a db open */
89 typedef struct tdb_context {
90 char *name; /* the name of the database */
91 void *map_ptr; /* where it is currently mapped */
92 int fd; /* open file descriptor for the database */
93 tdb_len map_size; /* how much space has been mapped */
94 int read_only; /* opened read-only */
95 struct tdb_lock_type *locked; /* array of chain locks */
96 enum TDB_ERROR ecode; /* error code for last tdb error */
97 struct tdb_header header; /* a cached copy of the header */
98 u32 flags; /* the flags passed to tdb_open */
99 u32 *lockedkeys; /* array of locked keys: first is #keys */
100 struct tdb_traverse_lock travlocks; /* current traversal locks */
101 struct tdb_context *next; /* all tdbs to avoid multiple opens */
102 dev_t device; /* uniquely identifies this tdb */
103 ino_t inode; /* uniquely identifies this tdb */
104 void (*log_fn)(struct tdb_context *tdb, int level, const char *, ...) PRINTF_ATTRIBUTE(3,4); /* logging function */
105 u32 (*hash_fn)(TDB_DATA *key);
106 int open_flags; /* flags used in the open - needed by reopen */
109 typedef int (*tdb_traverse_func)(TDB_CONTEXT *, TDB_DATA, TDB_DATA, void *);
110 typedef void (*tdb_log_func)(TDB_CONTEXT *, int , const char *, ...);
111 typedef u32 (*tdb_hash_func)(TDB_DATA *key);
113 TDB_CONTEXT *tdb_open(const char *name, int hash_size, int tdb_flags,
114 int open_flags, mode_t mode);
115 TDB_CONTEXT *tdb_open_ex(const char *name, int hash_size, int tdb_flags,
116 int open_flags, mode_t mode,
118 tdb_hash_func hash_fn);
120 int tdb_reopen(TDB_CONTEXT *tdb);
121 int tdb_reopen_all(void);
122 void tdb_logging_function(TDB_CONTEXT *tdb, tdb_log_func);
123 enum TDB_ERROR tdb_error(TDB_CONTEXT *tdb);
124 const char *tdb_errorstr(TDB_CONTEXT *tdb);
125 TDB_DATA tdb_fetch(TDB_CONTEXT *tdb, TDB_DATA key);
126 int tdb_delete(TDB_CONTEXT *tdb, TDB_DATA key);
127 int tdb_store(TDB_CONTEXT *tdb, TDB_DATA key, TDB_DATA dbuf, int flag);
128 int tdb_append(TDB_CONTEXT *tdb, TDB_DATA key, TDB_DATA new_dbuf);
129 int tdb_close(TDB_CONTEXT *tdb);
130 TDB_DATA tdb_firstkey(TDB_CONTEXT *tdb);
131 TDB_DATA tdb_nextkey(TDB_CONTEXT *tdb, TDB_DATA key);
132 int tdb_traverse(TDB_CONTEXT *tdb, tdb_traverse_func fn, void *);
133 int tdb_exists(TDB_CONTEXT *tdb, TDB_DATA key);
134 int tdb_lockkeys(TDB_CONTEXT *tdb, u32 number, TDB_DATA keys[]);
135 void tdb_unlockkeys(TDB_CONTEXT *tdb);
136 int tdb_lockall(TDB_CONTEXT *tdb);
137 void tdb_unlockall(TDB_CONTEXT *tdb);
139 /* Low level locking functions: use with care */
140 void tdb_set_lock_alarm(sig_atomic_t *palarm);
141 int tdb_chainlock(TDB_CONTEXT *tdb, TDB_DATA key);
142 int tdb_chainunlock(TDB_CONTEXT *tdb, TDB_DATA key);
144 /* Debug functions. Not used in production. */
145 void tdb_dump_all(TDB_CONTEXT *tdb);
146 int tdb_printfreelist(TDB_CONTEXT *tdb);
148 extern TDB_DATA tdb_null;