5 Unix SMB/CIFS implementation.
6 Samba database functions
7 Copyright (C) Andrew Tridgell 1999
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 2 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program; if not, write to the Free Software
21 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
29 /* flags to tdb_store() */
34 /* flags for tdb_open() */
35 #define TDB_DEFAULT 0 /* just a readability place holder */
36 #define TDB_CLEAR_IF_FIRST 1
37 #define TDB_INTERNAL 2 /* don't store on disk */
38 #define TDB_NOLOCK 4 /* don't do any locking */
39 #define TDB_NOMMAP 8 /* don't use mmap */
40 #define TDB_CONVERT 16 /* convert endian (internal use) */
41 #define TDB_BIGENDIAN 32 /* header is big-endian (internal use) */
43 #define TDB_ERRCODE(code, ret) ((tdb->ecode = (code)), ret)
46 enum TDB_ERROR {TDB_SUCCESS=0, TDB_ERR_CORRUPT, TDB_ERR_IO, TDB_ERR_LOCK,
47 TDB_ERR_OOM, TDB_ERR_EXISTS, TDB_ERR_NOEXIST, TDB_ERR_NOLOCK, TDB_ERR_LOCK_TIMEOUT };
61 /* this is stored at the front of every database */
63 char magic_food[32]; /* for /etc/magic */
64 u32 version; /* version of the code */
65 u32 hash_size; /* number of hash entries */
70 struct tdb_lock_type {
75 struct tdb_traverse_lock {
76 struct tdb_traverse_lock *next;
81 /* this is the context structure that is returned from a db open */
82 typedef struct tdb_context {
83 char *name; /* the name of the database */
84 void *map_ptr; /* where it is currently mapped */
85 int fd; /* open file descriptor for the database */
86 tdb_len map_size; /* how much space has been mapped */
87 int read_only; /* opened read-only */
88 struct tdb_lock_type *locked; /* array of chain locks */
89 enum TDB_ERROR ecode; /* error code for last tdb error */
90 struct tdb_header header; /* a cached copy of the header */
91 u32 flags; /* the flags passed to tdb_open */
92 u32 *lockedkeys; /* array of locked keys: first is #keys */
93 struct tdb_traverse_lock travlocks; /* current traversal locks */
94 struct tdb_context *next; /* all tdbs to avoid multiple opens */
95 dev_t device; /* uniquely identifies this tdb */
96 ino_t inode; /* uniquely identifies this tdb */
97 void (*log_fn)(struct tdb_context *tdb, int level, const char *, ...); /* logging function */
98 int open_flags; /* flags used in the open - needed by reopen */
101 typedef int (*tdb_traverse_func)(TDB_CONTEXT *, TDB_DATA, TDB_DATA, void *);
102 typedef void (*tdb_log_func)(TDB_CONTEXT *, int , const char *, ...);
104 TDB_CONTEXT *tdb_open(const char *name, int hash_size, int tdb_flags,
105 int open_flags, mode_t mode);
106 TDB_CONTEXT *tdb_open_ex(const char *name, int hash_size, int tdb_flags,
107 int open_flags, mode_t mode,
108 tdb_log_func log_fn);
110 int tdb_reopen(TDB_CONTEXT *tdb);
111 int tdb_reopen_all(void);
112 void tdb_logging_function(TDB_CONTEXT *tdb, tdb_log_func);
113 enum TDB_ERROR tdb_error(TDB_CONTEXT *tdb);
114 const char *tdb_errorstr(TDB_CONTEXT *tdb);
115 TDB_DATA tdb_fetch(TDB_CONTEXT *tdb, TDB_DATA key);
116 int tdb_delete(TDB_CONTEXT *tdb, TDB_DATA key);
117 int tdb_store(TDB_CONTEXT *tdb, TDB_DATA key, TDB_DATA dbuf, int flag);
118 int tdb_append(TDB_CONTEXT *tdb, TDB_DATA key, TDB_DATA new_dbuf);
119 int tdb_close(TDB_CONTEXT *tdb);
120 TDB_DATA tdb_firstkey(TDB_CONTEXT *tdb);
121 TDB_DATA tdb_nextkey(TDB_CONTEXT *tdb, TDB_DATA key);
122 int tdb_traverse(TDB_CONTEXT *tdb, tdb_traverse_func fn, void *state);
123 int tdb_exists(TDB_CONTEXT *tdb, TDB_DATA key);
124 int tdb_lockkeys(TDB_CONTEXT *tdb, u32 number, TDB_DATA keys[]);
125 void tdb_unlockkeys(TDB_CONTEXT *tdb);
126 int tdb_lockall(TDB_CONTEXT *tdb);
127 void tdb_unlockall(TDB_CONTEXT *tdb);
129 /* Low level locking functions: use with care */
130 void tdb_set_lock_alarm(sig_atomic_t *palarm);
131 int tdb_chainlock(TDB_CONTEXT *tdb, TDB_DATA key);
132 int tdb_chainunlock(TDB_CONTEXT *tdb, TDB_DATA key);
134 /* Debug functions. Not used in production. */
135 void tdb_dump_all(TDB_CONTEXT *tdb);
136 int tdb_printfreelist(TDB_CONTEXT *tdb);
138 extern TDB_DATA tdb_null;