7 Unix SMB/CIFS implementation.
9 trivial database library
11 Copyright (C) Andrew Tridgell 1999-2004
13 ** NOTE! The following LGPL license applies to the tdb
14 ** library. This does NOT imply that all of Samba is released
17 This library is free software; you can redistribute it and/or
18 modify it under the terms of the GNU Lesser General Public
19 License as published by the Free Software Foundation; either
20 version 2 of the License, or (at your option) any later version.
22 This library is distributed in the hope that it will be useful,
23 but WITHOUT ANY WARRANTY; without even the implied warranty of
24 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
25 Lesser General Public License for more details.
27 You should have received a copy of the GNU Lesser General Public
28 License along with this library; if not, write to the Free Software
29 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
36 #ifndef PRINTF_ATTRIBUTE
37 /** Use gcc attribute to check printf fns. a1 is the 1-based index of
38 * the parameter containing the format, and a2 the index of the first
39 * argument. Note that some gcc 2.x versions don't handle this
42 #define PRINTF_ATTRIBUTE(a1, a2) __attribute__ ((format (__printf__, a1, a2)))
44 #define PRINTF_ATTRIBUTE(a1, a2)
48 /* flags to tdb_store() */
53 /* flags for tdb_open() */
54 #define TDB_DEFAULT 0 /* just a readability place holder */
55 #define TDB_CLEAR_IF_FIRST 1
56 #define TDB_INTERNAL 2 /* don't store on disk */
57 #define TDB_NOLOCK 4 /* don't do any locking */
58 #define TDB_NOMMAP 8 /* don't use mmap */
59 #define TDB_CONVERT 16 /* convert endian (internal use) */
60 #define TDB_BIGENDIAN 32 /* header is big-endian (internal use) */
62 #define TDB_ERRCODE(code, ret) ((tdb->ecode = (code)), ret)
65 enum TDB_ERROR {TDB_SUCCESS=0, TDB_ERR_CORRUPT, TDB_ERR_IO, TDB_ERR_LOCK,
66 TDB_ERR_OOM, TDB_ERR_EXISTS, TDB_ERR_NOLOCK, TDB_ERR_LOCK_TIMEOUT,
81 /* this is stored at the front of every database */
83 char magic_food[32]; /* for /etc/magic */
84 u32 version; /* version of the code */
85 u32 hash_size; /* number of hash entries */
90 struct tdb_lock_type {
95 struct tdb_traverse_lock {
96 struct tdb_traverse_lock *next;
101 /* this is the context structure that is returned from a db open */
102 typedef struct tdb_context {
103 char *name; /* the name of the database */
104 void *map_ptr; /* where it is currently mapped */
105 int fd; /* open file descriptor for the database */
106 tdb_len map_size; /* how much space has been mapped */
107 int read_only; /* opened read-only */
108 struct tdb_lock_type *locked; /* array of chain locks */
109 enum TDB_ERROR ecode; /* error code for last tdb error */
110 struct tdb_header header; /* a cached copy of the header */
111 u32 flags; /* the flags passed to tdb_open */
112 struct tdb_traverse_lock travlocks; /* current traversal locks */
113 struct tdb_context *next; /* all tdbs to avoid multiple opens */
114 dev_t device; /* uniquely identifies this tdb */
115 ino_t inode; /* uniquely identifies this tdb */
116 void (*log_fn)(struct tdb_context *tdb, int level, const char *, ...) PRINTF_ATTRIBUTE(3,4); /* logging function */
117 u32 (*hash_fn)(TDB_DATA *key);
118 int open_flags; /* flags used in the open - needed by reopen */
121 typedef int (*tdb_traverse_func)(TDB_CONTEXT *, TDB_DATA, TDB_DATA, void *);
122 typedef void (*tdb_log_func)(TDB_CONTEXT *, int , const char *, ...);
123 typedef u32 (*tdb_hash_func)(TDB_DATA *key);
125 TDB_CONTEXT *tdb_open(const char *name, int hash_size, int tdb_flags,
126 int open_flags, mode_t mode);
127 TDB_CONTEXT *tdb_open_ex(const char *name, int hash_size, int tdb_flags,
128 int open_flags, mode_t mode,
130 tdb_hash_func hash_fn);
132 int tdb_reopen(TDB_CONTEXT *tdb);
133 int tdb_reopen_all(void);
134 void tdb_logging_function(TDB_CONTEXT *tdb, tdb_log_func);
135 enum TDB_ERROR tdb_error(TDB_CONTEXT *tdb);
136 const char *tdb_errorstr(TDB_CONTEXT *tdb);
137 TDB_DATA tdb_fetch(TDB_CONTEXT *tdb, TDB_DATA key);
138 int tdb_delete(TDB_CONTEXT *tdb, TDB_DATA key);
139 int tdb_store(TDB_CONTEXT *tdb, TDB_DATA key, TDB_DATA dbuf, int flag);
140 int tdb_append(TDB_CONTEXT *tdb, TDB_DATA key, TDB_DATA new_dbuf);
141 int tdb_close(TDB_CONTEXT *tdb);
142 TDB_DATA tdb_firstkey(TDB_CONTEXT *tdb);
143 TDB_DATA tdb_nextkey(TDB_CONTEXT *tdb, TDB_DATA key);
144 int tdb_traverse(TDB_CONTEXT *tdb, tdb_traverse_func fn, void *);
145 int tdb_exists(TDB_CONTEXT *tdb, TDB_DATA key);
146 int tdb_lockkeys(TDB_CONTEXT *tdb, u32 number, TDB_DATA keys[]);
147 void tdb_unlockkeys(TDB_CONTEXT *tdb);
148 int tdb_lockall(TDB_CONTEXT *tdb);
149 void tdb_unlockall(TDB_CONTEXT *tdb);
151 /* Low level locking functions: use with care */
152 void tdb_set_lock_alarm(sig_atomic_t *palarm);
153 int tdb_chainlock(TDB_CONTEXT *tdb, TDB_DATA key);
154 int tdb_chainunlock(TDB_CONTEXT *tdb, TDB_DATA key);
156 /* Debug functions. Not used in production. */
157 void tdb_dump_all(TDB_CONTEXT *tdb);
158 int tdb_printfreelist(TDB_CONTEXT *tdb);
160 extern TDB_DATA tdb_null;
166 #endif /* PPP_TBD_H */