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128 lines
4.3 KiB
C
128 lines
4.3 KiB
C
/* mdb.h - memory-mapped database library header file */
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/*
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* Copyright 2011 Howard Chu, Symas Corp.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted only as authorized by the OpenLDAP
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* Public License.
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*
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* A copy of this license is available in the file LICENSE in the
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* top-level directory of the distribution or, alternatively, at
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* <http://www.OpenLDAP.org/license.html>.
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*
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* This code is derived from btree.c written by Martin Hedenfalk.
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*
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* Copyright (c) 2009, 2010 Martin Hedenfalk <martin@bzero.se>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#ifndef _MDB_H_
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#define _MDB_H_
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#include <sys/types.h>
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struct MDB_cursor;
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struct MDB_txn;
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struct MDB_env;
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typedef struct MDB_cursor MDB_cursor;
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typedef struct MDB_txn MDB_txn;
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typedef struct MDB_env MDB_env;
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typedef unsigned int MDB_dbi;
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typedef struct MDB_val {
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void *mv_data;
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size_t mv_size;
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} MDB_val;
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typedef int (MDB_cmp_func)(const MDB_val *a, const MDB_val *b);
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typedef void (MDB_rel_func)(void *ptr, void *oldptr);
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#define MDB_NOOVERWRITE 1
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typedef enum MDB_cursor_op { /* cursor operations */
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MDB_SET, /* position at key, or fail */
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MDB_SET_RANGE, /* position at given key */
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MDB_FIRST,
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MDB_NEXT,
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MDB_LAST,
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MDB_PREV, /* not implemented */
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MDB_GET_BOTH, /* position at key/data */
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MDB_GET_BOTH_RANGE /* position at key, nearest data */
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} MDB_cursor_op;
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/* return codes */
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#define MDB_FAIL -1
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#define MDB_SUCCESS 0
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/* DB flags */
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#define MDB_REVERSEKEY 0x02 /* use reverse string keys */
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#define MDB_DUPSORT 0x04 /* use sorted duplicates */
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/* environment flags */
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#define MDB_FIXEDMAP 0x01 /* mmap at a fixed address */
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#define MDB_NOSYNC 0x10000 /* don't fsync after commit */
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#define MDB_RDONLY 0x20000 /* read only */
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/* DB or env flags */
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#define MDB_CREATE 0x40000 /* create if not present */
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typedef struct MDB_stat {
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unsigned int ms_psize;
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unsigned int ms_depth;
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unsigned long ms_branch_pages;
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unsigned long ms_leaf_pages;
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unsigned long ms_overflow_pages;
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unsigned long ms_entries;
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} MDB_stat;
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int mdbenv_create(MDB_env **env);
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int mdbenv_open(MDB_env *env, const char *path, unsigned int flags, mode_t mode);
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int mdbenv_stat(MDB_env *env, MDB_stat *stat);
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void mdbenv_close(MDB_env *env);
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int mdbenv_get_flags(MDB_env *env, unsigned int *flags);
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int mdbenv_get_path(MDB_env *env, const char **path);
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int mdbenv_set_mapsize(MDB_env *env, size_t size);
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int mdbenv_set_maxreaders(MDB_env *env, int readers);
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int mdbenv_get_maxreaders(MDB_env *env, int *readers);
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int mdbenv_set_maxdbs(MDB_env *env, int dbs);
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int mdbenv_sync(MDB_env *env);
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int mdb_txn_begin(MDB_env *env, int rdonly, MDB_txn **txn);
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int mdb_txn_commit(MDB_txn *txn);
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void mdb_txn_abort(MDB_txn *txn);
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int mdb_open(MDB_txn *txn, const char *name, unsigned int flags, MDB_dbi *dbi);
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int mdb_stat(MDB_txn *txn, MDB_dbi dbi, MDB_stat *stat);
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void mdb_close(MDB_txn *txn, MDB_dbi dbi);
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int mdb_set_compare(MDB_txn *txn, MDB_dbi dbi, MDB_cmp_func *cmp);
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int mdb_set_dupsort(MDB_txn *txn, MDB_dbi dbi, MDB_cmp_func *cmp);
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int mdb_set_relfunc(MDB_txn *txn, MDB_dbi dbi, MDB_rel_func *rel);
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int mdb_get(MDB_txn *txn, MDB_dbi dbi, MDB_val *key, MDB_val *data);
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int mdb_put(MDB_txn *txn, MDB_dbi dbi, MDB_val *key, MDB_val *data,
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unsigned int flags);
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int mdb_del(MDB_txn *txn, MDB_dbi dbi, MDB_val *key, MDB_val *data);
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int mdb_cursor_open(MDB_txn *txn, MDB_dbi dbi, MDB_cursor **cursor);
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void mdb_cursor_close(MDB_cursor *cursor);
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int mdb_cursor_get(MDB_cursor *cursor, MDB_val *key, MDB_val *data,
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MDB_cursor_op op);
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int mdb_cmp(MDB_txn *txn, MDB_dbi dbi, const MDB_val *a, const MDB_val *b);
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#endif /* _MDB_H_ */
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