typedef int (MDB_cmp_func)(const MDB_val *a, const MDB_val *b);
/** A callback function used to relocate a position-dependent data item
- * in a fixed-address database. The \b newptr gives the item's current address in
- * the memory map, and \b oldptr gives its previous address. This callback is
- * expected to walk through the fields of the record in newptr and modify any
+ * in a fixed-address database. The \b newptr gives the item's desired address in
+ * the memory map, and \b oldptr gives its previous address. The item's actual
+ * data resides at the address in \b item. This callback is expected to walk
+ * through the fields of the record in \b item and modify any
* values based at the \b oldptr address to be relative to the \b newptr address.
+ * @param[in,out] item The item that is to be relocated.
+ * @param[in] oldptr The previous address.
+ * @param[in] newptr The new address to relocate to.
+ * @param[in] relctx An application-provided context, set by #mdb_set_relctx().
* @todo This feature is currently unimplemented.
*/
-typedef void (MDB_rel_func)(void *newptr, void *oldptr, size_t size);
+typedef void (MDB_rel_func)(MDB_val *item, void *oldptr, void *newptr, void *relctx);
/** @defgroup mdb_env Environment Flags
* @{
#define MDB_CURRENT 0x40
/* @} */
-/** Cursor operations */
+/** Cursor Get operations
+ * This is the set of all operations for retrieving data
+ * using a cursor.
+ */
typedef enum MDB_cursor_op {
MDB_FIRST, /**< Position at first key/data item */
MDB_FIRST_DUP, /**< Position at first data item of current key.
unsigned int ms_psize; /**< Size of a database page.
This is currently the same for all databases. */
unsigned int ms_depth; /**< Depth (height) of the B-tree */
- unsigned long ms_branch_pages; /**< Number of internal (non-leaf) pages */
- unsigned long ms_leaf_pages; /**< Number of leaf pages */
- unsigned long ms_overflow_pages; /**< Number of overflow pages */
- unsigned long ms_entries; /**< Number of data items */
+ size_t ms_branch_pages; /**< Number of internal (non-leaf) pages */
+ size_t ms_leaf_pages; /**< Number of leaf pages */
+ size_t ms_overflow_pages; /**< Number of overflow pages */
+ size_t ms_entries; /**< Number of data items */
} MDB_stat;
/** Return the mdb library version information.
* <li>EINVAL - an invalid parameter was specified, or the environment is already open.
* </ul>
*/
-int mdb_env_set_maxdbs(MDB_env *env, int dbs);
+int mdb_env_set_maxdbs(MDB_env *env, MDB_dbi dbs);
/** Create a transaction for use with the environment.
* The transaction handle may be discarded using #mdb_txn_abort() or #mdb_txn_commit().
* <li>#MDB_INTEGERKEY
* Keys are binary integers in native byte order. Setting this option
* requires all keys to be the same size, typically sizeof(int)
- * or sizeof(long).
+ * or sizeof(size_t).
* <li>#MDB_DUPFIXED
* This flag may only be used in combination with #MDB_DUPSORT. This option
* tells the library that the data items for this database are all the same
* with #mdb_open(), the keys are compared lexically, with shorter keys collating
* before longer keys.
* @warning This function must be called before any data access functions are used,
- * otherwise data corruption may occur. The same function must be used by every
- * process accessing the database, every time the database is used.
+ * otherwise data corruption may occur. The same comparison function must be used by every
+ * program accessing the database, every time the database is used.
* @param[in] txn A transaction handle returned by #mdb_txn_begin()
* @param[in] dbi A database handle returned by #mdb_open()
* @param[in] cmp A #MDB_cmp_func function
* with #mdb_open(), the data items are compared lexically, with shorter items collating
* before longer items.
* @warning This function must be called before any data access functions are used,
- * otherwise data corruption may occur. The same function must be used by every
- * process accessing the database, every time the database is used.
+ * otherwise data corruption may occur. The same comparison function must be used by every
+ * program accessing the database, every time the database is used.
* @param[in] txn A transaction handle returned by #mdb_txn_begin()
* @param[in] dbi A database handle returned by #mdb_open()
* @param[in] cmp A #MDB_cmp_func function
*/
int mdb_set_relfunc(MDB_txn *txn, MDB_dbi dbi, MDB_rel_func *rel);
+ /** Set a context pointer for a #MDB_FIXEDMAP database's relocation function.
+ * See #mdb_set_relfunc and #MDB_rel_func for more details.
+ * @param[in] txn A transaction handle returned by #mdb_txn_begin()
+ * @param[in] dbi A database handle returned by #mdb_open()
+ * @param[in] ctx An arbitrary pointer for whatever the application needs.
+ * It will be passed to the callback function set by #mdb_set_relfunc
+ * as its \b relctx parameter whenever the callback is invoked.
+ * @return A non-zero error value on failure and 0 on success. Some possible
+ * errors are:
+ * <ul>
+ * <li>EINVAL - an invalid parameter was specified.
+ * </ul>
+ */
+int mdb_set_relctx(MDB_txn *txn, MDB_dbi dbi, void *ctx);
+
/** Get items from a database.
* This function retrieves key/data pairs from the database. The address
* and length of the data associated with the specified \b key are returned
* <li>EINVAL - cursor is not initialized, or an invalid parameter was specified.
* </ul>
*/
-int mdb_cursor_count(MDB_cursor *cursor, unsigned long *countp);
+int mdb_cursor_count(MDB_cursor *cursor, size_t *countp);
/** Compare two data items according to a particular database.
* This returns a comparison as if the two data items were keys in the
*/
int mdb_cmp(MDB_txn *txn, MDB_dbi dbi, const MDB_val *a, const MDB_val *b);
+ /** Compare two data items according to a particular database.
+ * This returns a comparison as if the two items were data items of
+ * a sorted duplicates #MDB_DUPSORT database.
+ * @param[in] txn A transaction handle returned by #mdb_txn_begin()
+ * @param[in] dbi A database handle returned by #mdb_open()
+ * @param[in] a The first item to compare
+ * @param[in] b The second item to compare
+ * @return < 0 if a < b, 0 if a == b, > 0 if a > b
+ */
+int mdb_dcmp(MDB_txn *txn, MDB_dbi dbi, const MDB_val *a, const MDB_val *b);
/** @} */
#endif /* _MDB_H_ */
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