lib/tdb/include/tdb.h

   1 #ifndef __TDB_H__
   2 #define __TDB_H__
   3
   4 /*
   5    Unix SMB/CIFS implementation.
   6
   7    trivial database library
   8
   9    Copyright (C) Andrew Tridgell 1999-2004
  10
  11      ** NOTE! The following LGPL license applies to the tdb
  12      ** library. This does NOT imply that all of Samba is released
  13      ** under the LGPL
  14
  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.
  19
  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.
  24
  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/>.
  27 */
  28
  29 #ifdef  __cplusplus
  30 extern "C" {
  31 #endif
  32
  33 #include "signal.h"
  34
  35 /* flags to tdb_store() */
  36 #define TDB_REPLACE 1           /* Unused */
  37 #define TDB_INSERT 2            /* Don't overwrite an existing entry */
  38 #define TDB_MODIFY 3            /* Don't create an existing entry    */
  39
  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 */
  50 #define TDB_VOLATILE   256 /* Activate the per-hashchain freelist, default 5 */
  51 #define TDB_ALLOW_NESTING 512 /* Allow transactions to nest */
  52 #define TDB_DISALLOW_NESTING 1024 /* Disallow transactions to nest */
  53
  54 /* error codes */
  55 enum TDB_ERROR {TDB_SUCCESS=0, TDB_ERR_CORRUPT, TDB_ERR_IO, TDB_ERR_LOCK,
  56                 TDB_ERR_OOM, TDB_ERR_EXISTS, TDB_ERR_NOLOCK, TDB_ERR_LOCK_TIMEOUT,
  57                 TDB_ERR_NOEXIST, TDB_ERR_EINVAL, TDB_ERR_RDONLY,
  58                 TDB_ERR_NESTING};
  59
  60 /* debugging uses one of the following levels */
  61 enum tdb_debug_level {TDB_DEBUG_FATAL = 0, TDB_DEBUG_ERROR,
  62                       TDB_DEBUG_WARNING, TDB_DEBUG_TRACE};
  63
  64 typedef struct TDB_DATA {
  65         unsigned char *dptr;
  66         size_t dsize;
  67 } TDB_DATA;
  68
  69 #ifndef PRINTF_ATTRIBUTE
  70 #if (__GNUC__ >= 3)
  71 /** Use gcc attribute to check printf fns.  a1 is the 1-based index of
  72  * the parameter containing the format, and a2 the index of the first
  73  * argument. Note that some gcc 2.x versions don't handle this
  74  * properly **/
  75 #define PRINTF_ATTRIBUTE(a1, a2) __attribute__ ((format (__printf__, a1, a2)))
  76 #else
  77 #define PRINTF_ATTRIBUTE(a1, a2)
  78 #endif
  79 #endif
  80
  81 /* this is the context structure that is returned from a db open */
  82 typedef struct tdb_context TDB_CONTEXT;
  83
  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_ATTRIBUTE(3, 4);
  86 typedef unsigned int (*tdb_hash_func)(TDB_DATA *key);
  87
  88 struct tdb_logging_context {
  89         tdb_log_func log_fn;
  90         void *log_private;
  91 };
  92
  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);
 100
 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,
 109                                    void *private_data),
 110                      void *private_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 int tdb_check(struct tdb_context *tdb,
 146               int (*check) (TDB_DATA key, TDB_DATA data, void *private_data),
 147               void *private_data);
 148
 149 /* Low level locking functions: use with care */
 150 int tdb_chainlock(struct tdb_context *tdb, TDB_DATA key);
 151 int tdb_chainlock_nonblock(struct tdb_context *tdb, TDB_DATA key);
 152 int tdb_chainunlock(struct tdb_context *tdb, TDB_DATA key);
 153 int tdb_chainlock_read(struct tdb_context *tdb, TDB_DATA key);
 154 int tdb_chainunlock_read(struct tdb_context *tdb, TDB_DATA key);
 155 int tdb_chainlock_mark(struct tdb_context *tdb, TDB_DATA key);
 156 int tdb_chainlock_unmark(struct tdb_context *tdb, TDB_DATA key);
 157
 158 void tdb_setalarm_sigptr(struct tdb_context *tdb, volatile sig_atomic_t *sigptr);
 159
 160 /* wipe and repack */
 161 int tdb_wipe_all(struct tdb_context *tdb);
 162 int tdb_repack(struct tdb_context *tdb);
 163
 164 /* Debug functions. Not used in production. */
 165 void tdb_dump_all(struct tdb_context *tdb);
 166 int tdb_printfreelist(struct tdb_context *tdb);
 167 int tdb_validate_freelist(struct tdb_context *tdb, int *pnum_entries);
 168 int tdb_freelist_size(struct tdb_context *tdb);
 169
 170 extern TDB_DATA tdb_null;
 171
 172 #ifdef  __cplusplus
 173 }
 174 #endif
 175
 176 #endif /* tdb.h */