mirror of
https://github.com/isar/libmdbx.git
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2032 lines
88 KiB
C
2032 lines
88 KiB
C
/* LICENSE AND COPYRUSTING *****************************************************
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*
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* Copyright 2015-2019 Leonid Yuriev <leo@yuriev.ru>
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* and other libmdbx authors: please see AUTHORS file.
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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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* ---
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*
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* This code is derived from "LMDB engine" written by
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* Howard Chu (Symas Corporation), which itself derived from btree.c
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* written by Martin Hedenfalk.
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*
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* ---
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*
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* Portions Copyright 2011-2015 Howard Chu, Symas Corp. 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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* ---
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*
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* Portions 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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/* ACKNOWLEDGEMENTS ************************************************************
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*
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* Howard Chu (Symas Corporation) - the author of LMDB,
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* from which originated the MDBX in 2015.
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*
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* Martin Hedenfalk <martin@bzero.se> - the author of `btree.c` code,
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* which was used for begin development of LMDB. */
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#pragma once
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#ifndef LIBMDBX_H
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#define LIBMDBX_H
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/*******************************************************************************
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*
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* libmdbx is superior to LMDB in terms of features and reliability, not
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* inferior in performance. libmdbx works on Linux, FreeBSD, MacOS X and other
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* systems compliant with POSIX.1-2008, but also support Windows as a
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* complementary platform.
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*
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* The next version is under active non-public development and will be released
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* as MithrilDB and libmithrildb for libraries & packages. Admittedly mythical
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* Mithril is resembling silver but being stronger and lighter than steel.
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* Therefore MithrilDB is rightly relevant name.
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*
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* MithrilDB will be radically different from libmdbx by the new database format
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* and API based on C++17, as well as the Apache 2.0 License. The goal of this
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* revolution is to provide a clearer and robust API, add more features and new
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* valuable properties of database.
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*
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* The Future will (be) Positive. Всё будет хорошо.
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*
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******************************************************************************/
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#ifdef _MSC_VER
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#pragma warning(push, 1)
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#pragma warning(disable : 4548) /* expression before comma has no effect; \
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expected expression with side - effect */
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#pragma warning(disable : 4530) /* C++ exception handler used, but unwind \
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* semantics are not enabled. Specify /EHsc */
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#pragma warning(disable : 4577) /* 'noexcept' used with no exception handling \
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* mode specified; termination on exception is \
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* not guaranteed. Specify /EHsc */
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#endif /* _MSC_VER (warnings) */
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#include <stdarg.h>
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#include <stddef.h>
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#include <stdint.h>
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#if defined(_WIN32) || defined(_WIN64)
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#include <windows.h>
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#include <winnt.h>
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#ifndef __mode_t_defined
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typedef unsigned short mode_t;
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#endif
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typedef HANDLE mdbx_filehandle_t;
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typedef DWORD mdbx_pid_t;
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typedef DWORD mdbx_tid_t;
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#define MDBX_ENODATA ERROR_HANDLE_EOF
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#define MDBX_EINVAL ERROR_INVALID_PARAMETER
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#define MDBX_EACCESS ERROR_ACCESS_DENIED
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#define MDBX_ENOMEM ERROR_OUTOFMEMORY
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#define MDBX_EROFS ERROR_FILE_READ_ONLY
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#define MDBX_ENOSYS ERROR_NOT_SUPPORTED
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#define MDBX_EIO ERROR_WRITE_FAULT
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#define MDBX_EPERM ERROR_INVALID_FUNCTION
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#define MDBX_EINTR ERROR_CANCELLED
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#define MDBX_ENOFILE ERROR_FILE_NOT_FOUND
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#else
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#include <errno.h> /* for error codes */
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#include <pthread.h> /* for pthread_t */
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#include <sys/types.h> /* for pid_t */
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#include <sys/uio.h> /* for truct iovec */
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#define HAVE_STRUCT_IOVEC 1
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typedef int mdbx_filehandle_t;
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typedef pid_t mdbx_pid_t;
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typedef pthread_t mdbx_tid_t;
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#ifdef ENODATA
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#define MDBX_ENODATA ENODATA
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#else
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#define MDBX_ENODATA -1
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#endif
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#define MDBX_EINVAL EINVAL
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#define MDBX_EACCESS EACCES
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#define MDBX_ENOMEM ENOMEM
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#define MDBX_EROFS EROFS
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#define MDBX_ENOSYS ENOSYS
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#define MDBX_EIO EIO
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#define MDBX_EPERM EPERM
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#define MDBX_EINTR EINTR
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#define MDBX_ENOFILE ENOENT
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#endif
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#ifdef _MSC_VER
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#pragma warning(pop)
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#endif
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/*--------------------------------------------------------------------------*/
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#ifndef __has_attribute
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#define __has_attribute(x) (0)
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#endif
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#ifndef __dll_export
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#if defined(_WIN32) || defined(__CYGWIN__)
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#if defined(__GNUC__) || __has_attribute(dllexport)
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#define __dll_export __attribute__((dllexport))
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#elif defined(_MSC_VER)
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#define __dll_export __declspec(dllexport)
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#else
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#define __dll_export
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#endif
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#elif defined(__GNUC__) || __has_attribute(__visibility__)
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#define __dll_export __attribute__((__visibility__("default")))
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#else
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#define __dll_export
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#endif
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#endif /* __dll_export */
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#ifndef __dll_import
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#if defined(_WIN32) || defined(__CYGWIN__)
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#if defined(__GNUC__) || __has_attribute(dllimport)
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#define __dll_import __attribute__((dllimport))
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#elif defined(_MSC_VER)
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#define __dll_import __declspec(dllimport)
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#else
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#define __dll_import
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#endif
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#else
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#define __dll_import
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#endif
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#endif /* __dll_import */
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/*--------------------------------------------------------------------------*/
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#define MDBX_VERSION_MAJOR 0
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#define MDBX_VERSION_MINOR 3
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#ifndef LIBMDBX_API
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#if defined(LIBMDBX_EXPORTS)
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#define LIBMDBX_API __dll_export
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#elif defined(LIBMDBX_IMPORTS)
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#define LIBMDBX_API __dll_import
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#else
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#define LIBMDBX_API
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#endif
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#endif /* LIBMDBX_API */
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#ifdef __cplusplus
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extern "C" {
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#endif
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typedef struct mdbx_version_info {
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uint8_t major;
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uint8_t minor;
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uint16_t release;
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uint32_t revision;
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struct /* source info from git */ {
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const char *datetime /* committer date, strict ISO-8601 format */;
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const char *tree /* commit hash (hexadecimal digits) */;
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const char *commit /* tree hash, i.e. digest of the source code */;
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const char *describe /* git-describe string */;
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} git;
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const char *sourcery /* sourcery anchor for pinning */;
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} mdbx_version_info;
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typedef struct mdbx_build_info {
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const char *datetime /* build timestamp (ISO-8601 or __DATE__ __TIME__) */;
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const char *target /* cpu/arch-system-config triplet */;
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const char *options /* mdbx-related options */;
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const char *compiler /* compiler */;
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const char *flags /* CFLAGS */;
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} mdbx_build_info;
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extern LIBMDBX_API const mdbx_version_info mdbx_version;
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extern LIBMDBX_API const mdbx_build_info mdbx_build;
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#if defined(_WIN32) || defined(_WIN64)
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#if !MDBX_BUILD_SHARED_LIBRARY
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/* Dll initialization callback for ability to dynamically load MDBX DLL by
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* LoadLibrary() on Windows versions before Windows Vista. This function MUST be
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* called once from DllMain() for each reason (DLL_PROCESS_ATTACH,
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* DLL_PROCESS_DETACH, DLL_THREAD_ATTACH and DLL_THREAD_DETACH). Do this
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* carefully and ONLY when actual Windows version don't support initialization
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* via "TLS Directory" (e.g .CRT$XL[A-Z] sections in executable or dll file). */
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#ifndef MDBX_CONFIG_MANUAL_TLS_CALLBACK
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#define MDBX_CONFIG_MANUAL_TLS_CALLBACK 0
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#endif
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#if MDBX_CONFIG_MANUAL_TLS_CALLBACK
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void LIBMDBX_API NTAPI mdbx_dll_callback(PVOID module, DWORD reason,
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PVOID reserved);
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#endif /* MDBX_CONFIG_MANUAL_TLS_CALLBACK */
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#endif /* !MDBX_BUILD_SHARED_LIBRARY */
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#endif /* Windows */
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/* The name of the lock file in the DB environment */
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#define MDBX_LOCKNAME "/mdbx.lck"
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/* The name of the data file in the DB environment */
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#define MDBX_DATANAME "/mdbx.dat"
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/* The suffix of the lock file when no subdir is used */
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#define MDBX_LOCK_SUFFIX "-lck"
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/* Opaque structure for a database environment.
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*
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* A DB environment supports multiple databases, all residing in the same
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* shared-memory map. */
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typedef struct MDBX_env MDBX_env;
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/* Opaque structure for a transaction handle.
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*
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* All database operations require a transaction handle. Transactions may be
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* read-only or read-write. */
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typedef struct MDBX_txn MDBX_txn;
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/* A handle for an individual database in the DB environment. */
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typedef uint32_t MDBX_dbi;
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/* Opaque structure for navigating through a database */
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typedef struct MDBX_cursor MDBX_cursor;
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/* Generic structure used for passing keys and data in and out
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* of the database.
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*
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* Values returned from the database are valid only until a subsequent
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* update operation, or the end of the transaction. Do not modify or
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* free them, they commonly point into the database itself.
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*
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* Key sizes must be between 1 and mdbx_env_get_maxkeysize() inclusive.
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* The same applies to data sizes in databases with the MDBX_DUPSORT flag.
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* Other data items can in theory be from 0 to 0xffffffff bytes long. */
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#ifndef HAVE_STRUCT_IOVEC
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struct iovec {
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void *iov_base;
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size_t iov_len;
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};
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#define HAVE_STRUCT_IOVEC
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#endif /* HAVE_STRUCT_IOVEC */
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typedef struct iovec MDBX_val;
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/* The maximum size of a data item.
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* MDBX only store a 32 bit value for node sizes. */
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#define MDBX_MAXDATASIZE INT32_MAX
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/* A callback function used to compare two keys in a database */
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typedef int(MDBX_cmp_func)(const MDBX_val *a, const MDBX_val *b);
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/* Environment Flags */
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/* no environment directory */
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#define MDBX_NOSUBDIR 0x4000u
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/* don't fsync after commit */
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#define MDBX_NOSYNC 0x10000u
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/* read only */
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#define MDBX_RDONLY 0x20000u
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/* don't fsync metapage after commit */
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#define MDBX_NOMETASYNC 0x40000u
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/* use writable mmap */
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#define MDBX_WRITEMAP 0x80000u
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/* use asynchronous msync when MDBX_WRITEMAP is used */
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#define MDBX_MAPASYNC 0x100000u
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/* tie reader locktable slots to MDBX_txn objects instead of to threads */
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#define MDBX_NOTLS 0x200000u
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/* open DB in exclusive/monopolistic mode. */
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#define MDBX_EXCLUSIVE 0x400000u
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/* don't do readahead */
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#define MDBX_NORDAHEAD 0x800000u
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/* don't initialize malloc'd memory before writing to datafile */
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#define MDBX_NOMEMINIT 0x1000000u
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/* aim to coalesce FreeDB records */
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#define MDBX_COALESCE 0x2000000u
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/* LIFO policy for reclaiming FreeDB records */
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#define MDBX_LIFORECLAIM 0x4000000u
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/* make a steady-sync only on close and explicit env-sync */
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#define MDBX_UTTERLY_NOSYNC (MDBX_NOSYNC | MDBX_MAPASYNC)
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/* debuging option, fill/perturb released pages */
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#define MDBX_PAGEPERTURB 0x8000000u
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/* Database Flags */
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/* use reverse string keys */
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#define MDBX_REVERSEKEY 0x02u
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/* use sorted duplicates */
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#define MDBX_DUPSORT 0x04u
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/* numeric keys in native byte order, either uint32_t or uint64_t.
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* The keys must all be of the same size. */
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#define MDBX_INTEGERKEY 0x08u
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/* with MDBX_DUPSORT, sorted dup items have fixed size */
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#define MDBX_DUPFIXED 0x10u
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/* with MDBX_DUPSORT, dups are MDBX_INTEGERKEY-style integers */
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#define MDBX_INTEGERDUP 0x20u
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/* with MDBX_DUPSORT, use reverse string dups */
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#define MDBX_REVERSEDUP 0x40u
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/* create DB if not already existing */
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#define MDBX_CREATE 0x40000u
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/* Write Flags */
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/* For put: Don't write if the key already exists. */
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#define MDBX_NOOVERWRITE 0x10u
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/* Only for MDBX_DUPSORT
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* For put: don't write if the key and data pair already exist.
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* For mdbx_cursor_del: remove all duplicate data items. */
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#define MDBX_NODUPDATA 0x20u
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/* For mdbx_cursor_put: overwrite the current key/data pair
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* MDBX allows this flag for mdbx_put() for explicit overwrite/update without
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* insertion. */
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#define MDBX_CURRENT 0x40u
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/* For put: Just reserve space for data, don't copy it. Return a
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* pointer to the reserved space. */
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#define MDBX_RESERVE 0x10000u
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/* Data is being appended, don't split full pages. */
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#define MDBX_APPEND 0x20000u
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/* Duplicate data is being appended, don't split full pages. */
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#define MDBX_APPENDDUP 0x40000u
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/* Store multiple data items in one call. Only for MDBX_DUPFIXED. */
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#define MDBX_MULTIPLE 0x80000u
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/* Transaction Flags */
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/* Do not block when starting a write transaction */
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#define MDBX_TRYTXN 0x10000000u
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/* Copy Flags */
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/* Compacting copy: Omit free space from copy, and renumber all
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* pages sequentially. */
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#define MDBX_CP_COMPACT 1u
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/* Cursor Get operations.
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*
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* This is the set of all operations for retrieving data
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* using a cursor. */
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typedef enum MDBX_cursor_op {
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MDBX_FIRST, /* Position at first key/data item */
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MDBX_FIRST_DUP, /* MDBX_DUPSORT-only: Position at first data item
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* of current key. */
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MDBX_GET_BOTH, /* MDBX_DUPSORT-only: Position at key/data pair. */
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MDBX_GET_BOTH_RANGE, /* MDBX_DUPSORT-only: position at key, nearest data. */
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MDBX_GET_CURRENT, /* Return key/data at current cursor position */
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MDBX_GET_MULTIPLE, /* MDBX_DUPFIXED-only: Return up to a page of duplicate
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* data items from current cursor position.
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* Move cursor to prepare for MDBX_NEXT_MULTIPLE. */
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MDBX_LAST, /* Position at last key/data item */
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MDBX_LAST_DUP, /* MDBX_DUPSORT-only: Position at last data item
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* of current key. */
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MDBX_NEXT, /* Position at next data item */
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MDBX_NEXT_DUP, /* MDBX_DUPSORT-only: Position at next data item
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* of current key. */
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MDBX_NEXT_MULTIPLE, /* MDBX_DUPFIXED-only: Return up to a page of duplicate
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* data items from next cursor position.
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* Move cursor to prepare for MDBX_NEXT_MULTIPLE. */
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MDBX_NEXT_NODUP, /* Position at first data item of next key */
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MDBX_PREV, /* Position at previous data item */
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MDBX_PREV_DUP, /* MDBX_DUPSORT-only: Position at previous data item
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* of current key. */
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MDBX_PREV_NODUP, /* Position at last data item of previous key */
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MDBX_SET, /* Position at specified key */
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MDBX_SET_KEY, /* Position at specified key, return both key and data */
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MDBX_SET_RANGE, /* Position at first key greater than or equal to
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* specified key. */
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MDBX_PREV_MULTIPLE /* MDBX_DUPFIXED-only: Position at previous page and
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* return up to a page of duplicate data items. */
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} MDBX_cursor_op;
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/* Return Codes
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* BerkeleyDB uses -30800 to -30999, we'll go under them */
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/* Successful result */
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#define MDBX_SUCCESS 0
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#define MDBX_RESULT_FALSE MDBX_SUCCESS
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#define MDBX_RESULT_TRUE (-1)
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/* key/data pair already exists */
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#define MDBX_KEYEXIST (-30799)
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/* key/data pair not found (EOF) */
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#define MDBX_NOTFOUND (-30798)
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/* Requested page not found - this usually indicates corruption */
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#define MDBX_PAGE_NOTFOUND (-30797)
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/* Located page was wrong type */
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#define MDBX_CORRUPTED (-30796)
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/* Update of meta page failed or environment had fatal error */
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#define MDBX_PANIC (-30795)
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/* DB file version mismatch with libmdbx */
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#define MDBX_VERSION_MISMATCH (-30794)
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/* File is not a valid MDBX file */
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#define MDBX_INVALID (-30793)
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/* Environment mapsize reached */
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#define MDBX_MAP_FULL (-30792)
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/* Environment maxdbs reached */
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#define MDBX_DBS_FULL (-30791)
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/* Environment maxreaders reached */
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#define MDBX_READERS_FULL (-30790)
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/* Txn has too many dirty pages */
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#define MDBX_TXN_FULL (-30788)
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/* Cursor stack too deep - internal error */
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#define MDBX_CURSOR_FULL (-30787)
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/* Page has not enough space - internal error */
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#define MDBX_PAGE_FULL (-30786)
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/* Database contents grew beyond environment mapsize */
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#define MDBX_MAP_RESIZED (-30785)
|
|
/* Operation and DB incompatible, or DB type changed. This can mean:
|
|
* - The operation expects an MDBX_DUPSORT / MDBX_DUPFIXED database.
|
|
* - Opening a named DB when the unnamed DB has MDBX_DUPSORT/MDBX_INTEGERKEY.
|
|
* - Accessing a data record as a database, or vice versa.
|
|
* - The database was dropped and recreated with different flags. */
|
|
#define MDBX_INCOMPATIBLE (-30784)
|
|
/* Invalid reuse of reader locktable slot */
|
|
#define MDBX_BAD_RSLOT (-30783)
|
|
/* Transaction must abort, has a child, or is invalid */
|
|
#define MDBX_BAD_TXN (-30782)
|
|
/* Unsupported size of key/DB name/data, or wrong DUPFIXED size */
|
|
#define MDBX_BAD_VALSIZE (-30781)
|
|
/* The specified DBI was changed unexpectedly */
|
|
#define MDBX_BAD_DBI (-30780)
|
|
/* Unexpected problem - txn should abort */
|
|
#define MDBX_PROBLEM (-30779)
|
|
/* Another write transaction is running */
|
|
#define MDBX_BUSY (-30778)
|
|
/* The last defined error code */
|
|
#define MDBX_LAST_ERRCODE MDBX_BUSY
|
|
|
|
/* The mdbx_put() or mdbx_replace() was called for key,
|
|
that has more that one associated value. */
|
|
#define MDBX_EMULTIVAL (-30421)
|
|
|
|
/* Bad signature of a runtime object(s), this can mean:
|
|
* - memory corruption or double-free;
|
|
* - ABI version mismatch (rare case); */
|
|
#define MDBX_EBADSIGN (-30420)
|
|
|
|
/* Database should be recovered, but this could NOT be done automatically
|
|
* right now (e.g. in readonly mode and so forth). */
|
|
#define MDBX_WANNA_RECOVERY (-30419)
|
|
|
|
/* The given key value is mismatched to the current cursor position,
|
|
* when mdbx_cursor_put() called with MDBX_CURRENT option. */
|
|
#define MDBX_EKEYMISMATCH (-30418)
|
|
|
|
/* Database is too large for current system,
|
|
* e.g. could NOT be mapped into RAM. */
|
|
#define MDBX_TOO_LARGE (-30417)
|
|
|
|
/* A thread has attempted to use a not owned object,
|
|
* e.g. a transaction that started by another thread. */
|
|
#define MDBX_THREAD_MISMATCH (-30416)
|
|
|
|
/* Statistics for a database in the environment */
|
|
typedef struct MDBX_stat {
|
|
uint32_t ms_psize; /* Size of a database page.
|
|
* This is currently the same for all databases. */
|
|
uint32_t ms_depth; /* Depth (height) of the B-tree */
|
|
uint64_t ms_branch_pages; /* Number of internal (non-leaf) pages */
|
|
uint64_t ms_leaf_pages; /* Number of leaf pages */
|
|
uint64_t ms_overflow_pages; /* Number of overflow pages */
|
|
uint64_t ms_entries; /* Number of data items */
|
|
} MDBX_stat;
|
|
|
|
/* Information about the environment */
|
|
typedef struct MDBX_envinfo {
|
|
struct {
|
|
uint64_t lower; /* lower limit for datafile size */
|
|
uint64_t upper; /* upper limit for datafile size */
|
|
uint64_t current; /* current datafile size */
|
|
uint64_t shrink; /* shrink threshold for datafile */
|
|
uint64_t grow; /* growth step for datafile */
|
|
} mi_geo;
|
|
uint64_t mi_mapsize; /* Size of the data memory map */
|
|
uint64_t mi_last_pgno; /* ID of the last used page */
|
|
uint64_t mi_recent_txnid; /* ID of the last committed transaction */
|
|
uint64_t mi_latter_reader_txnid; /* ID of the last reader transaction */
|
|
uint64_t mi_self_latter_reader_txnid; /* ID of the last reader transaction of
|
|
caller process */
|
|
uint64_t mi_meta0_txnid, mi_meta0_sign;
|
|
uint64_t mi_meta1_txnid, mi_meta1_sign;
|
|
uint64_t mi_meta2_txnid, mi_meta2_sign;
|
|
uint32_t mi_maxreaders; /* max reader slots in the environment */
|
|
uint32_t mi_numreaders; /* max reader slots used in the environment */
|
|
uint32_t mi_dxb_pagesize; /* database pagesize */
|
|
uint32_t mi_sys_pagesize; /* system pagesize */
|
|
} MDBX_envinfo;
|
|
|
|
/* Return a string describing a given error code.
|
|
*
|
|
* This function is a superset of the ANSI C X3.159-1989 (ANSI C) strerror(3)
|
|
* function. If the error code is greater than or equal to 0, then the string
|
|
* returned by the system function strerror(3) is returned. If the error code
|
|
* is less than 0, an error string corresponding to the MDBX library error is
|
|
* returned. See errors for a list of MDBX-specific error codes.
|
|
*
|
|
* [in] err The error code
|
|
*
|
|
* Returns "error message" The description of the error */
|
|
LIBMDBX_API const char *mdbx_strerror(int errnum);
|
|
LIBMDBX_API const char *mdbx_strerror_r(int errnum, char *buf, size_t buflen);
|
|
|
|
#if defined(_WIN32) || defined(_WIN64)
|
|
/* Bit of madness for Windows */
|
|
LIBMDBX_API const char *mdbx_strerror_ANSI2OEM(int errnum);
|
|
LIBMDBX_API const char *mdbx_strerror_r_ANSI2OEM(int errnum, char *buf,
|
|
size_t buflen);
|
|
#endif /* Bit of madness for Windows */
|
|
|
|
/* Create an MDBX environment handle.
|
|
*
|
|
* This function allocates memory for a MDBX_env structure. To release
|
|
* the allocated memory and discard the handle, call mdbx_env_close().
|
|
* Before the handle may be used, it must be opened using mdbx_env_open().
|
|
* Various other options may also need to be set before opening the handle,
|
|
* e.g. mdbx_env_set_mapsize(), mdbx_env_set_maxreaders(),
|
|
* mdbx_env_set_maxdbs(), depending on usage requirements.
|
|
*
|
|
* [out] env The address where the new handle will be stored
|
|
*
|
|
* Returns A non-zero error value on failure and 0 on success. */
|
|
LIBMDBX_API int mdbx_env_create(MDBX_env **penv);
|
|
|
|
/* Open an environment handle.
|
|
*
|
|
* If this function fails, mdbx_env_close() must be called to discard
|
|
* the MDBX_env handle.
|
|
*
|
|
* [in] env An environment handle returned by mdbx_env_create()
|
|
* [in] path The directory in which the database files reside.
|
|
* This directory must already exist and be writable.
|
|
* [in] flags Special options for this environment. This parameter
|
|
* must be set to 0 or by bitwise OR'ing together one
|
|
* or more of the values described here.
|
|
*
|
|
* Flags set by mdbx_env_set_flags() are also used:
|
|
* - MDBX_NOSUBDIR
|
|
* By default, MDBX creates its environment in a directory whose
|
|
* pathname is given in path, and creates its data and lock files
|
|
* under that directory. With this option, path is used as-is for
|
|
* the database main data file. The database lock file is the path
|
|
* with "-lock" appended.
|
|
*
|
|
* - MDBX_RDONLY
|
|
* Open the environment in read-only mode. No write operations will
|
|
* be allowed. MDBX will still modify the lock file - except on
|
|
* read-only filesystems, where MDBX does not use locks.
|
|
*
|
|
* - MDBX_WRITEMAP
|
|
* Use a writeable memory map unless MDBX_RDONLY is set. This uses fewer
|
|
* mallocs but loses protection from application bugs like wild pointer
|
|
* writes and other bad updates into the database.
|
|
* This may be slightly faster for DBs that fit entirely in RAM,
|
|
* but is slower for DBs larger than RAM.
|
|
* Incompatible with nested transactions.
|
|
* Do not mix processes with and without MDBX_WRITEMAP on the same
|
|
* environment. This can defeat durability (mdbx_env_sync etc).
|
|
*
|
|
* - MDBX_NOMETASYNC
|
|
* Flush system buffers to disk only once per transaction, omit the
|
|
* metadata flush. Defer that until the system flushes files to disk,
|
|
* or next non-MDBX_RDONLY commit or mdbx_env_sync(). This optimization
|
|
* maintains database integrity, but a system crash may undo the last
|
|
* committed transaction. I.e. it preserves the ACI (atomicity,
|
|
* consistency, isolation) but not D (durability) database property.
|
|
* This flag may be changed at any time using mdbx_env_set_flags().
|
|
*
|
|
* - MDBX_NOSYNC
|
|
* Don't flush system buffers to disk when committing a transaction.
|
|
* This optimization means a system crash can corrupt the database or
|
|
* lose the last transactions if buffers are not yet flushed to disk.
|
|
* The risk is governed by how often the system flushes dirty buffers
|
|
* to disk and how often mdbx_env_sync() is called. However, if the
|
|
* filesystem preserves write order and the MDBX_WRITEMAP and/or
|
|
* MDBX_LIFORECLAIM flags are not used, transactions exhibit ACI
|
|
* (atomicity, consistency, isolation) properties and only lose D
|
|
* (durability). I.e. database integrity is maintained, but a system
|
|
* crash may undo the final transactions.
|
|
*
|
|
* Note that (MDBX_NOSYNC | MDBX_WRITEMAP) leaves the system with no
|
|
* hint for when to write transactions to disk.
|
|
* Therefore the (MDBX_MAPASYNC | MDBX_WRITEMAP) may be preferable.
|
|
* This flag may be changed at any time using mdbx_env_set_flags().
|
|
*
|
|
* - MDBX_UTTERLY_NOSYNC (internally MDBX_NOSYNC | MDBX_MAPASYNC)
|
|
* FIXME: TODO
|
|
*
|
|
* - MDBX_MAPASYNC
|
|
* When using MDBX_WRITEMAP, use asynchronous flushes to disk. As with
|
|
* MDBX_NOSYNC, a system crash can then corrupt the database or lose
|
|
* the last transactions. Calling mdbx_env_sync() ensures on-disk
|
|
* database integrity until next commit. This flag may be changed at
|
|
* any time using mdbx_env_set_flags().
|
|
*
|
|
* - MDBX_NOTLS
|
|
* Don't use Thread-Local Storage. Tie reader locktable slots to
|
|
* MDBX_txn objects instead of to threads. I.e. mdbx_txn_reset() keeps
|
|
* the slot reserved for the MDBX_txn object. A thread may use parallel
|
|
* read-only transactions. A read-only transaction may span threads if
|
|
* the user synchronizes its use. Applications that multiplex many
|
|
* user threads over individual OS threads need this option. Such an
|
|
* application must also serialize the write transactions in an OS
|
|
* thread, since MDBX's write locking is unaware of the user threads.
|
|
*
|
|
* - MDBX_NOLOCK (don't supported by MDBX)
|
|
* Don't do any locking. If concurrent access is anticipated, the
|
|
* caller must manage all concurrency itself. For proper operation
|
|
* the caller must enforce single-writer semantics, and must ensure
|
|
* that no readers are using old transactions while a writer is
|
|
* active. The simplest approach is to use an exclusive lock so that
|
|
* no readers may be active at all when a writer begins.
|
|
*
|
|
* - MDBX_NORDAHEAD
|
|
* Turn off readahead. Most operating systems perform readahead on
|
|
* read requests by default. This option turns it off if the OS
|
|
* supports it. Turning it off may help random read performance
|
|
* when the DB is larger than RAM and system RAM is full.
|
|
*
|
|
* - MDBX_NOMEMINIT
|
|
* Don't initialize malloc'd memory before writing to unused spaces
|
|
* in the data file. By default, memory for pages written to the data
|
|
* file is obtained using malloc. While these pages may be reused in
|
|
* subsequent transactions, freshly malloc'd pages will be initialized
|
|
* to zeroes before use. This avoids persisting leftover data from other
|
|
* code (that used the heap and subsequently freed the memory) into the
|
|
* data file. Note that many other system libraries may allocate and free
|
|
* memory from the heap for arbitrary uses. E.g., stdio may use the heap
|
|
* for file I/O buffers. This initialization step has a modest performance
|
|
* cost so some applications may want to disable it using this flag. This
|
|
* option can be a problem for applications which handle sensitive data
|
|
* like passwords, and it makes memory checkers like Valgrind noisy. This
|
|
* flag is not needed with MDBX_WRITEMAP, which writes directly to the
|
|
* mmap instead of using malloc for pages. The initialization is also
|
|
* skipped if MDBX_RESERVE is used; the caller is expected to overwrite
|
|
* all of the memory that was reserved in that case. This flag may be
|
|
* changed at any time using mdbx_env_set_flags().
|
|
*
|
|
* - MDBX_COALESCE
|
|
* Aim to coalesce records while reclaiming FreeDB. This flag may be
|
|
* changed at any time using mdbx_env_set_flags().
|
|
* FIXME: TODO
|
|
*
|
|
* - MDBX_LIFORECLAIM
|
|
* LIFO policy for reclaiming FreeDB records. This significantly reduce
|
|
* write IPOs in case MDBX_NOSYNC with periodically checkpoints.
|
|
* FIXME: TODO
|
|
*
|
|
* [in] mode The UNIX permissions to set on created files.
|
|
*
|
|
* Returns A non-zero error value on failure and 0 on success, some
|
|
* possible errors are:
|
|
* - MDBX_VERSION_MISMATCH - the version of the MDBX library doesn't match the
|
|
* version that created the database environment.
|
|
* - MDBX_INVALID - the environment file headers are corrupted.
|
|
* - MDBX_ENOENT - the directory specified by the path parameter
|
|
* doesn't exist.
|
|
* - MDBX_EACCES - the user didn't have permission to access
|
|
* the environment files.
|
|
* - MDBX_EAGAIN - the environment was locked by another process. */
|
|
LIBMDBX_API int mdbx_env_open(MDBX_env *env, const char *path, unsigned flags,
|
|
mode_t mode);
|
|
|
|
/* Copy an MDBX environment to the specified path, with options.
|
|
*
|
|
* This function may be used to make a backup of an existing environment.
|
|
* No lockfile is created, since it gets recreated at need.
|
|
* NOTE: This call can trigger significant file size growth if run in
|
|
* parallel with write transactions, because it employs a read-only
|
|
* transaction. See long-lived transactions under "Caveats" section.
|
|
*
|
|
* [in] env An environment handle returned by mdbx_env_create(). It must
|
|
* have already been opened successfully.
|
|
* [in] path The directory in which the copy will reside. This directory
|
|
* must already exist and be writable but must otherwise be empty.
|
|
* [in] flags Special options for this operation. This parameter must be set
|
|
* to 0 or by bitwise OR'ing together one or more of the values
|
|
* described here:
|
|
*
|
|
* - MDBX_CP_COMPACT
|
|
* Perform compaction while copying: omit free pages and sequentially
|
|
* renumber all pages in output. This option consumes little bit more
|
|
* CPU for processing, but may running quickly than the default, on
|
|
* account skipping free pages.
|
|
*
|
|
* NOTE: Currently it fails if the environment has suffered a page leak.
|
|
*
|
|
* Returns A non-zero error value on failure and 0 on success. */
|
|
LIBMDBX_API int mdbx_env_copy(MDBX_env *env, const char *dest_path,
|
|
unsigned flags);
|
|
|
|
/* Copy an MDBX environment to the specified file descriptor,
|
|
* with options.
|
|
*
|
|
* This function may be used to make a backup of an existing environment.
|
|
* No lockfile is created, since it gets recreated at need. See
|
|
* mdbx_env_copy() for further details.
|
|
*
|
|
* NOTE: This call can trigger significant file size growth if run in
|
|
* parallel with write transactions, because it employs a read-only
|
|
* transaction. See long-lived transactions under "Caveats" section.
|
|
*
|
|
* [in] env An environment handle returned by mdbx_env_create(). It must
|
|
* have already been opened successfully.
|
|
* [in] fd The filedescriptor to write the copy to. It must have already
|
|
* been opened for Write access.
|
|
* [in] flags Special options for this operation. See mdbx_env_copy() for
|
|
* options.
|
|
*
|
|
* Returns A non-zero error value on failure and 0 on success. */
|
|
LIBMDBX_API int mdbx_env_copy2fd(MDBX_env *env, mdbx_filehandle_t fd,
|
|
unsigned flags);
|
|
|
|
/* Return statistics about the MDBX environment.
|
|
*
|
|
* [in] env An environment handle returned by mdbx_env_create()
|
|
* [out] stat The address of an MDBX_stat structure where the statistics
|
|
* will be copied */
|
|
LIBMDBX_API int mdbx_env_stat(MDBX_env *env, MDBX_stat *stat, size_t bytes);
|
|
LIBMDBX_API int mdbx_env_stat2(const MDBX_env *env, const MDBX_txn *txn,
|
|
MDBX_stat *stat, size_t bytes);
|
|
|
|
/* Return information about the MDBX environment.
|
|
*
|
|
* [in] env An environment handle returned by mdbx_env_create()
|
|
* [out] stat The address of an MDBX_envinfo structure
|
|
* where the information will be copied */
|
|
LIBMDBX_API int mdbx_env_info(MDBX_env *env, MDBX_envinfo *info, size_t bytes);
|
|
LIBMDBX_API int mdbx_env_info2(const MDBX_env *env, const MDBX_txn *txn,
|
|
MDBX_envinfo *info, size_t bytes);
|
|
|
|
/* Flush the data buffers to disk.
|
|
*
|
|
* Data is always written to disk when mdbx_txn_commit() is called,
|
|
* but the operating system may keep it buffered. MDBX always flushes
|
|
* the OS buffers upon commit as well, unless the environment was
|
|
* opened with MDBX_NOSYNC or in part MDBX_NOMETASYNC. This call is
|
|
* not valid if the environment was opened with MDBX_RDONLY.
|
|
*
|
|
* [in] env An environment handle returned by mdbx_env_create()
|
|
* [in] force If non-zero, force a synchronous flush. Otherwise if the
|
|
* environment has the MDBX_NOSYNC flag set the flushes will be
|
|
* omitted, and with MDBX_MAPASYNC they will be asynchronous.
|
|
*
|
|
* Returns A non-zero error value on failure and 0 on success, some
|
|
* possible errors are:
|
|
* - MDBX_EACCES - the environment is read-only.
|
|
* - MDBX_EINVAL - an invalid parameter was specified.
|
|
* - MDBX_EIO - an error occurred during synchronization. */
|
|
LIBMDBX_API int mdbx_env_sync(MDBX_env *env, int force);
|
|
|
|
/* Close the environment and release the memory map.
|
|
*
|
|
* Only a single thread may call this function. All transactions, databases,
|
|
* and cursors must already be closed before calling this function. Attempts
|
|
* to use any such handles after calling this function will cause a SIGSEGV.
|
|
* The environment handle will be freed and must not be used again after this
|
|
* call.
|
|
*
|
|
* [in] env An environment handle returned by mdbx_env_create()
|
|
* [in] dont_sync A dont'sync flag, if non-zero the last checkpoint (meta-page
|
|
* update) will be kept "as is" and may be still "weak" in the
|
|
* NOSYNC/MAPASYNC modes. Such "weak" checkpoint will be
|
|
* ignored on opening next time, and transactions since the
|
|
* last non-weak checkpoint (meta-page update) will rolledback
|
|
* for consistency guarantee. */
|
|
LIBMDBX_API int mdbx_env_close(MDBX_env *env);
|
|
|
|
/* Set environment flags.
|
|
*
|
|
* This may be used to set some flags in addition to those from
|
|
* mdbx_env_open(), or to unset these flags. If several threads
|
|
* change the flags at the same time, the result is undefined.
|
|
*
|
|
* [in] env An environment handle returned by mdbx_env_create()
|
|
* [in] flags The flags to change, bitwise OR'ed together
|
|
* [in] onoff A non-zero value sets the flags, zero clears them.
|
|
*
|
|
* Returns A non-zero error value on failure and 0 on success, some
|
|
* possible errors are:
|
|
* - MDBX_EINVAL - an invalid parameter was specified. */
|
|
LIBMDBX_API int mdbx_env_set_flags(MDBX_env *env, unsigned flags, int onoff);
|
|
|
|
/* Get environment flags.
|
|
*
|
|
* [in] env An environment handle returned by mdbx_env_create()
|
|
* [out] flags The address of an integer to store the flags
|
|
*
|
|
* Returns A non-zero error value on failure and 0 on success, some
|
|
* possible errors are:
|
|
* - MDBX_EINVAL - an invalid parameter was specified. */
|
|
LIBMDBX_API int mdbx_env_get_flags(MDBX_env *env, unsigned *flags);
|
|
|
|
/* Return the path that was used in mdbx_env_open().
|
|
*
|
|
* [in] env An environment handle returned by mdbx_env_create()
|
|
* [out] path Address of a string pointer to contain the path.
|
|
* This is the actual string in the environment, not a copy.
|
|
* It should not be altered in any way.
|
|
*
|
|
* Returns A non-zero error value on failure and 0 on success, some
|
|
* possible errors are:
|
|
* - MDBX_EINVAL - an invalid parameter was specified. */
|
|
LIBMDBX_API int mdbx_env_get_path(MDBX_env *env, const char **path);
|
|
|
|
/* Return the file descriptor for the given environment.
|
|
*
|
|
* NOTE: All MDBX file descriptors have FD_CLOEXEC and
|
|
* could't be used after exec() and or fork().
|
|
*
|
|
* [in] env An environment handle returned by mdbx_env_create()
|
|
* [out] fd Address of a int to contain the descriptor.
|
|
*
|
|
* Returns A non-zero error value on failure and 0 on success, some
|
|
* possible errors are:
|
|
* - MDBX_EINVAL - an invalid parameter was specified. */
|
|
LIBMDBX_API int mdbx_env_get_fd(MDBX_env *env, mdbx_filehandle_t *fd);
|
|
|
|
/* Set the size of the memory map to use for this environment.
|
|
*
|
|
* The size should be a multiple of the OS page size. The default is
|
|
* 10485760 bytes. The size of the memory map is also the maximum size
|
|
* of the database. The value should be chosen as large as possible,
|
|
* to accommodate future growth of the database.
|
|
* This function should be called after mdbx_env_create() and before
|
|
* mdbx_env_open(). It may be called at later times if no transactions
|
|
* are active in this process. Note that the library does not check for
|
|
* this condition, the caller must ensure it explicitly.
|
|
*
|
|
* The new size takes effect immediately for the current process but
|
|
* will not be persisted to any others until a write transaction has been
|
|
* committed by the current process. Also, only mapsize increases are
|
|
* persisted into the environment.
|
|
*
|
|
* If the mapsize is increased by another process, and data has grown
|
|
* beyond the range of the current mapsize, mdbx_txn_begin() will
|
|
* return MDBX_MAP_RESIZED. This function may be called with a size
|
|
* of zero to adopt the new size.
|
|
*
|
|
* Any attempt to set a size smaller than the space already consumed by the
|
|
* environment will be silently changed to the current size of the used space.
|
|
*
|
|
* [in] env An environment handle returned by mdbx_env_create()
|
|
* [in] size The size in bytes
|
|
*
|
|
* Returns A non-zero error value on failure and 0 on success, some
|
|
* possible errors are:
|
|
* - MDBX_EINVAL - an invalid parameter was specified,
|
|
* or the environment has an active write transaction. */
|
|
LIBMDBX_API int mdbx_env_set_mapsize(MDBX_env *env, size_t size);
|
|
LIBMDBX_API int mdbx_env_set_geometry(MDBX_env *env, intptr_t size_lower,
|
|
intptr_t size_now, intptr_t size_upper,
|
|
intptr_t growth_step,
|
|
intptr_t shrink_threshold,
|
|
intptr_t pagesize);
|
|
#define MDBX_MIN_PAGESIZE 512
|
|
__inline intptr_t mdbx_limits_pgsize_min(void) { return MDBX_MIN_PAGESIZE; }
|
|
|
|
#define MDBX_MAX_PAGESIZE 65536
|
|
__inline intptr_t mdbx_limits_pgsize_max(void) { return MDBX_MAX_PAGESIZE; }
|
|
|
|
LIBMDBX_API intptr_t mdbx_limits_dbsize_min(intptr_t pagesize);
|
|
LIBMDBX_API intptr_t mdbx_limits_dbsize_max(intptr_t pagesize);
|
|
LIBMDBX_API intptr_t mdbx_limits_keysize_max(intptr_t pagesize);
|
|
LIBMDBX_API intptr_t mdbx_limits_txnsize_max(intptr_t pagesize);
|
|
|
|
/* Set the maximum number of threads/reader slots for the environment.
|
|
*
|
|
* This defines the number of slots in the lock table that is used to track
|
|
* readers in the the environment. The default is 61.
|
|
* Starting a read-only transaction normally ties a lock table slot to the
|
|
* current thread until the environment closes or the thread exits. If
|
|
* MDBX_NOTLS is in use, mdbx_txn_begin() instead ties the slot to the
|
|
* MDBX_txn object until it or the MDBX_env object is destroyed.
|
|
* This function may only be called after mdbx_env_create() and before
|
|
* mdbx_env_open().
|
|
*
|
|
* [in] env An environment handle returned by mdbx_env_create()
|
|
* [in] readers The maximum number of reader lock table slots
|
|
*
|
|
* Returns A non-zero error value on failure and 0 on success, some
|
|
* possible errors are:
|
|
* - MDBX_EINVAL - an invalid parameter was specified,
|
|
* or the environment is already open. */
|
|
LIBMDBX_API int mdbx_env_set_maxreaders(MDBX_env *env, unsigned readers);
|
|
|
|
/* Get the maximum number of threads/reader slots for the environment.
|
|
*
|
|
* [in] env An environment handle returned by mdbx_env_create()
|
|
* [out] readers Address of an integer to store the number of readers
|
|
*
|
|
* Returns A non-zero error value on failure and 0 on success, some
|
|
* possible errors are:
|
|
* - MDBX_EINVAL - an invalid parameter was specified. */
|
|
LIBMDBX_API int mdbx_env_get_maxreaders(MDBX_env *env, unsigned *readers);
|
|
|
|
/* Set the maximum number of named databases for the environment.
|
|
*
|
|
* This function is only needed if multiple databases will be used in the
|
|
* environment. Simpler applications that use the environment as a single
|
|
* unnamed database can ignore this option.
|
|
* This function may only be called after mdbx_env_create() and before
|
|
* mdbx_env_open().
|
|
*
|
|
* Currently a moderate number of slots are cheap but a huge number gets
|
|
* expensive: 7-120 words per transaction, and every mdbx_dbi_open()
|
|
* does a linear search of the opened slots.
|
|
*
|
|
* [in] env An environment handle returned by mdbx_env_create()
|
|
* [in] dbs The maximum number of databases
|
|
*
|
|
* Returns A non-zero error value on failure and 0 on success, some
|
|
* possible errors are:
|
|
* - MDBX_EINVAL - an invalid parameter was specified,
|
|
* or the environment is already open. */
|
|
LIBMDBX_API int mdbx_env_set_maxdbs(MDBX_env *env, MDBX_dbi dbs);
|
|
|
|
/* Get the maximum size of keys and MDBX_DUPSORT data we can write.
|
|
*
|
|
* [in] env An environment handle returned by mdbx_env_create()
|
|
*
|
|
* Returns The maximum size of a key we can write. */
|
|
LIBMDBX_API int mdbx_env_get_maxkeysize(MDBX_env *env);
|
|
|
|
/* Set application information associated with the MDBX_env.
|
|
*
|
|
* [in] env An environment handle returned by mdbx_env_create()
|
|
* [in] ctx An arbitrary pointer for whatever the application needs.
|
|
*
|
|
* Returns A non-zero error value on failure and 0 on success. */
|
|
LIBMDBX_API int mdbx_env_set_userctx(MDBX_env *env, void *ctx);
|
|
|
|
/* Get the application information associated with the MDBX_env.
|
|
*
|
|
* [in] env An environment handle returned by mdbx_env_create()
|
|
* Returns The pointer set by mdbx_env_set_userctx(). */
|
|
LIBMDBX_API void *mdbx_env_get_userctx(MDBX_env *env);
|
|
|
|
/* A callback function for most MDBX assert() failures,
|
|
* called before printing the message and aborting.
|
|
*
|
|
* [in] env An environment handle returned by mdbx_env_create().
|
|
* [in] msg The assertion message, not including newline. */
|
|
typedef void MDBX_assert_func(const MDBX_env *env, const char *msg,
|
|
const char *function, unsigned line);
|
|
|
|
/* Set or reset the assert() callback of the environment.
|
|
*
|
|
* Disabled if libmdbx is buillt with MDBX_DEBUG=0.
|
|
* NOTE: This hack should become obsolete as mdbx's error handling matures.
|
|
*
|
|
* [in] env An environment handle returned by mdbx_env_create().
|
|
* [in] func An MDBX_assert_func function, or 0.
|
|
*
|
|
* Returns A non-zero error value on failure and 0 on success. */
|
|
LIBMDBX_API int mdbx_env_set_assert(MDBX_env *env, MDBX_assert_func *func);
|
|
|
|
/* Create a transaction for use with the environment.
|
|
*
|
|
* The transaction handle may be discarded using mdbx_txn_abort()
|
|
* or mdbx_txn_commit().
|
|
* NOTE: A transaction and its cursors must only be used by a single
|
|
* thread, and a thread may only have a single transaction at a time.
|
|
* If MDBX_NOTLS is in use, this does not apply to read-only transactions.
|
|
* NOTE: Cursors may not span transactions.
|
|
*
|
|
* [in] env An environment handle returned by mdbx_env_create()
|
|
* [in] parent If this parameter is non-NULL, the new transaction will be
|
|
* a nested transaction, with the transaction indicated by parent
|
|
* as its parent. Transactions may be nested to any level.
|
|
* A parent transaction and its cursors may not issue any other
|
|
* operations than mdbx_txn_commit and mdbx_txn_abort while it
|
|
* has active child transactions.
|
|
* [in] flags Special options for this transaction. This parameter
|
|
* must be set to 0 or by bitwise OR'ing together one or more
|
|
* of the values described here.
|
|
*
|
|
* - MDBX_RDONLY
|
|
* This transaction will not perform any write operations.
|
|
*
|
|
* - MDBX_TRYTXN
|
|
* Do not block when starting a write transaction
|
|
*
|
|
* [out] txn Address where the new MDBX_txn handle will be stored
|
|
*
|
|
* Returns A non-zero error value on failure and 0 on success, some
|
|
* possible errors are:
|
|
* - MDBX_PANIC - a fatal error occurred earlier and the environment
|
|
* must be shut down.
|
|
* - MDBX_MAP_RESIZED - another process wrote data beyond this MDBX_env's
|
|
* mapsize and this environment's map must be resized
|
|
* as well. See mdbx_env_set_mapsize().
|
|
* - MDBX_READERS_FULL - a read-only transaction was requested and the reader
|
|
* lock table is full. See mdbx_env_set_maxreaders().
|
|
* - MDBX_ENOMEM - out of memory.
|
|
* - MDBX_BUSY - a write transaction is already started. */
|
|
LIBMDBX_API int mdbx_txn_begin(MDBX_env *env, MDBX_txn *parent, unsigned flags,
|
|
MDBX_txn **txn);
|
|
|
|
/* Returns the transaction's MDBX_env
|
|
*
|
|
* [in] txn A transaction handle returned by mdbx_txn_begin() */
|
|
LIBMDBX_API MDBX_env *mdbx_txn_env(MDBX_txn *txn);
|
|
|
|
/* Return the transaction's flags.
|
|
*
|
|
* This returns the flags associated with this transaction.
|
|
*
|
|
* [in] txn A transaction handle returned by mdbx_txn_begin()
|
|
*
|
|
* Returns A transaction flags, valid if input is an active transaction. */
|
|
LIBMDBX_API int mdbx_txn_flags(MDBX_txn *txn);
|
|
|
|
/* Return the transaction's ID.
|
|
*
|
|
* This returns the identifier associated with this transaction. For a
|
|
* read-only transaction, this corresponds to the snapshot being read;
|
|
* concurrent readers will frequently have the same transaction ID.
|
|
*
|
|
* [in] txn A transaction handle returned by mdbx_txn_begin()
|
|
*
|
|
* Returns A transaction ID, valid if input is an active transaction. */
|
|
LIBMDBX_API uint64_t mdbx_txn_id(MDBX_txn *txn);
|
|
|
|
/* Commit all the operations of a transaction into the database.
|
|
*
|
|
* The transaction handle is freed. It and its cursors must not be used
|
|
* again after this call, except with mdbx_cursor_renew().
|
|
*
|
|
* A cursor must be closed explicitly always, before
|
|
* or after its transaction ends. It can be reused with
|
|
* mdbx_cursor_renew() before finally closing it.
|
|
*
|
|
* [in] txn A transaction handle returned by mdbx_txn_begin()
|
|
*
|
|
* Returns A non-zero error value on failure and 0 on success, some
|
|
* possible errors are:
|
|
* - MDBX_EINVAL - an invalid parameter was specified.
|
|
* - MDBX_ENOSPC - no more disk space.
|
|
* - MDBX_EIO - a low-level I/O error occurred while writing.
|
|
* - MDBX_ENOMEM - out of memory. */
|
|
LIBMDBX_API int mdbx_txn_commit(MDBX_txn *txn);
|
|
|
|
/* Abandon all the operations of the transaction instead of saving them.
|
|
*
|
|
* The transaction handle is freed. It and its cursors must not be used
|
|
* again after this call, except with mdbx_cursor_renew().
|
|
*
|
|
* A cursor must be closed explicitly always, before or after its transaction
|
|
* ends. It can be reused with mdbx_cursor_renew() before finally closing it.
|
|
*
|
|
* [in] txn A transaction handle returned by mdbx_txn_begin(). */
|
|
LIBMDBX_API int mdbx_txn_abort(MDBX_txn *txn);
|
|
|
|
/* Reset a read-only transaction.
|
|
*
|
|
* Abort the transaction like mdbx_txn_abort(), but keep the transaction
|
|
* handle. Therefore mdbx_txn_renew() may reuse the handle. This saves
|
|
* allocation overhead if the process will start a new read-only transaction
|
|
* soon, and also locking overhead if MDBX_NOTLS is in use. The reader table
|
|
* lock is released, but the table slot stays tied to its thread or
|
|
* MDBX_txn. Use mdbx_txn_abort() to discard a reset handle, and to free
|
|
* its lock table slot if MDBX_NOTLS is in use.
|
|
*
|
|
* Cursors opened within the transaction must not be used
|
|
* again after this call, except with mdbx_cursor_renew().
|
|
*
|
|
* Reader locks generally don't interfere with writers, but they keep old
|
|
* versions of database pages allocated. Thus they prevent the old pages
|
|
* from being reused when writers commit new data, and so under heavy load
|
|
* the database size may grow much more rapidly than otherwise.
|
|
*
|
|
* [in] txn A transaction handle returned by mdbx_txn_begin() */
|
|
LIBMDBX_API int mdbx_txn_reset(MDBX_txn *txn);
|
|
|
|
/* Renew a read-only transaction.
|
|
*
|
|
* This acquires a new reader lock for a transaction handle that had been
|
|
* released by mdbx_txn_reset(). It must be called before a reset transaction
|
|
* may be used again.
|
|
*
|
|
* [in] txn A transaction handle returned by mdbx_txn_begin()
|
|
*
|
|
* Returns A non-zero error value on failure and 0 on success, some
|
|
* possible errors are:
|
|
* - MDBX_PANIC - a fatal error occurred earlier and the environment
|
|
* must be shut down.
|
|
* - MDBX_EINVAL - an invalid parameter was specified. */
|
|
LIBMDBX_API int mdbx_txn_renew(MDBX_txn *txn);
|
|
|
|
/* Open a table in the environment.
|
|
*
|
|
* A table handle denotes the name and parameters of a table, independently
|
|
* of whether such a table exists. The table handle may be discarded by
|
|
* calling mdbx_dbi_close(). The old table handle is returned if the table
|
|
* was already open. The handle may only be closed once.
|
|
*
|
|
* The table handle will be private to the current transaction until
|
|
* the transaction is successfully committed. If the transaction is
|
|
* aborted the handle will be closed automatically.
|
|
* After a successful commit the handle will reside in the shared
|
|
* environment, and may be used by other transactions.
|
|
*
|
|
* This function must not be called from multiple concurrent
|
|
* transactions in the same process. A transaction that uses
|
|
* this function must finish (either commit or abort) before
|
|
* any other transaction in the process may use this function.
|
|
*
|
|
* To use named table (with name != NULL), mdbx_env_set_maxdbs()
|
|
* must be called before opening the environment. Table names are
|
|
* keys in the internal unnamed table, and may be read but not written.
|
|
*
|
|
* [in] txn transaction handle returned by mdbx_txn_begin()
|
|
* [in] name The name of the table to open. If only a single
|
|
* table is needed in the environment, this value may be NULL.
|
|
* [in] flags Special options for this table. This parameter must be set
|
|
* to 0 or by bitwise OR'ing together one or more of the values
|
|
* described here:
|
|
* - MDBX_REVERSEKEY
|
|
* Keys are strings to be compared in reverse order, from the end
|
|
* of the strings to the beginning. By default, Keys are treated as
|
|
* strings and compared from beginning to end.
|
|
* - MDBX_DUPSORT
|
|
* Duplicate keys may be used in the table. Or, from another point of
|
|
* view, keys may have multiple data items, stored in sorted order. By
|
|
* default keys must be unique and may have only a single data item.
|
|
* - MDBX_INTEGERKEY
|
|
* Keys are binary integers in native byte order, either uin32_t or
|
|
* uint64_t, and will be sorted as such. The keys must all be of the
|
|
* same size.
|
|
* - MDBX_DUPFIXED
|
|
* This flag may only be used in combination with MDBX_DUPSORT. This
|
|
* option tells the library that the data items for this database are
|
|
* all the same size, which allows further optimizations in storage and
|
|
* retrieval. When all data items are the same size, the MDBX_GET_MULTIPLE,
|
|
* MDBX_NEXT_MULTIPLE and MDBX_PREV_MULTIPLE cursor operations may be used
|
|
* to retrieve multiple items at once.
|
|
* - MDBX_INTEGERDUP
|
|
* This option specifies that duplicate data items are binary integers,
|
|
* similar to MDBX_INTEGERKEY keys.
|
|
* - MDBX_REVERSEDUP
|
|
* This option specifies that duplicate data items should be compared as
|
|
* strings in reverse order (the comparison is performed in the direction
|
|
* from the last byte to the first).
|
|
* - MDBX_CREATE
|
|
* Create the named database if it doesn't exist. This option is not
|
|
* allowed in a read-only transaction or a read-only environment.
|
|
*
|
|
* [out] dbi Address where the new MDBX_dbi handle will be stored
|
|
*
|
|
* Returns A non-zero error value on failure and 0 on success, some
|
|
* possible errors are:
|
|
* - MDBX_NOTFOUND - the specified database doesn't exist in the
|
|
* environment and MDBX_CREATE was not specified.
|
|
* - MDBX_DBS_FULL - too many databases have been opened.
|
|
* See mdbx_env_set_maxdbs(). */
|
|
LIBMDBX_API int mdbx_dbi_open_ex(MDBX_txn *txn, const char *name,
|
|
unsigned flags, MDBX_dbi *dbi,
|
|
MDBX_cmp_func *keycmp, MDBX_cmp_func *datacmp);
|
|
LIBMDBX_API int mdbx_dbi_open(MDBX_txn *txn, const char *name, unsigned flags,
|
|
MDBX_dbi *dbi);
|
|
|
|
/* Retrieve statistics for a database.
|
|
*
|
|
* [in] txn A transaction handle returned by mdbx_txn_begin()
|
|
* [in] dbi A database handle returned by mdbx_dbi_open()
|
|
* [out] stat The address of an MDBX_stat structure where the statistics
|
|
* will be copied
|
|
*
|
|
* Returns A non-zero error value on failure and 0 on success, some
|
|
* possible errors are:
|
|
* - MDBX_EINVAL - an invalid parameter was specified. */
|
|
LIBMDBX_API int mdbx_dbi_stat(MDBX_txn *txn, MDBX_dbi dbi, MDBX_stat *stat,
|
|
size_t bytes);
|
|
|
|
/* Retrieve the DB flags for a database handle.
|
|
*
|
|
* [in] txn A transaction handle returned by mdbx_txn_begin()
|
|
* [in] dbi A database handle returned by mdbx_dbi_open()
|
|
* [out] flags Address where the flags will be returned.
|
|
* [out] state Address where the state will be returned.
|
|
*
|
|
* Returns A non-zero error value on failure and 0 on success. */
|
|
#define MDBX_TBL_DIRTY 0x01 /* DB was written in this txn */
|
|
#define MDBX_TBL_STALE 0x02 /* Named-DB record is older than txnID */
|
|
#define MDBX_TBL_FRESH 0x04 /* Named-DB handle opened in this txn */
|
|
#define MDBX_TBL_CREAT 0x08 /* Named-DB handle created in this txn */
|
|
LIBMDBX_API int mdbx_dbi_flags_ex(MDBX_txn *txn, MDBX_dbi dbi, unsigned *flags,
|
|
unsigned *state);
|
|
LIBMDBX_API int mdbx_dbi_flags(MDBX_txn *txn, MDBX_dbi dbi, unsigned *flags);
|
|
|
|
/* Close a database handle. Normally unnecessary.
|
|
*
|
|
* Use with care:
|
|
* FIXME: This call is not mutex protected. Handles should only be closed by
|
|
* a single thread, and only if no other threads are going to reference
|
|
* the database handle or one of its cursors any further. Do not close
|
|
* a handle if an existing transaction has modified its database.
|
|
* Doing so can cause misbehavior from database corruption to errors
|
|
* like MDBX_BAD_VALSIZE (since the DB name is gone).
|
|
*
|
|
* Closing a database handle is not necessary, but lets mdbx_dbi_open()
|
|
* reuse the handle value. Usually it's better to set a bigger
|
|
* mdbx_env_set_maxdbs(), unless that value would be large.
|
|
*
|
|
* [in] env An environment handle returned by mdbx_env_create()
|
|
* [in] dbi A database handle returned by mdbx_dbi_open()
|
|
*/
|
|
LIBMDBX_API int mdbx_dbi_close(MDBX_env *env, MDBX_dbi dbi);
|
|
|
|
/* Empty or delete+close a database.
|
|
*
|
|
* See mdbx_dbi_close() for restrictions about closing the DB handle.
|
|
*
|
|
* [in] txn A transaction handle returned by mdbx_txn_begin()
|
|
* [in] dbi A database handle returned by mdbx_dbi_open()
|
|
* [in] del 0 to empty the DB, 1 to delete it from the environment
|
|
* and close the DB handle.
|
|
*
|
|
* Returns A non-zero error value on failure and 0 on success. */
|
|
LIBMDBX_API int mdbx_drop(MDBX_txn *txn, MDBX_dbi dbi, int del);
|
|
|
|
/* 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 key are returned
|
|
* in the structure to which data refers.
|
|
* If the database supports duplicate keys (MDBX_DUPSORT) then the
|
|
* first data item for the key will be returned. Retrieval of other
|
|
* items requires the use of mdbx_cursor_get().
|
|
*
|
|
* NOTE: The memory pointed to by the returned values is owned by the
|
|
* database. The caller need not dispose of the memory, and may not
|
|
* modify it in any way. For values returned in a read-only transaction
|
|
* any modification attempts will cause a SIGSEGV.
|
|
*
|
|
* NOTE: Values returned from the database are valid only until a
|
|
* subsequent update operation, or the end of the transaction.
|
|
*
|
|
* [in] txn A transaction handle returned by mdbx_txn_begin()
|
|
* [in] dbi A database handle returned by mdbx_dbi_open()
|
|
* [in] key The key to search for in the database
|
|
* [in,out] data The data corresponding to the key
|
|
*
|
|
* Returns A non-zero error value on failure and 0 on success, some
|
|
* possible errors are:
|
|
* - MDBX_NOTFOUND - the key was not in the database.
|
|
* - MDBX_EINVAL - an invalid parameter was specified. */
|
|
LIBMDBX_API int mdbx_get(MDBX_txn *txn, MDBX_dbi dbi, MDBX_val *key,
|
|
MDBX_val *data);
|
|
LIBMDBX_API int mdbx_get2(MDBX_txn *txn, MDBX_dbi dbi, MDBX_val *key,
|
|
MDBX_val *data);
|
|
|
|
/* Store items into a database.
|
|
*
|
|
* This function stores key/data pairs in the database. The default behavior
|
|
* is to enter the new key/data pair, replacing any previously existing key
|
|
* if duplicates are disallowed, or adding a duplicate data item if
|
|
* duplicates are allowed (MDBX_DUPSORT).
|
|
*
|
|
* [in] txn A transaction handle returned by mdbx_txn_begin()
|
|
* [in] dbi A database handle returned by mdbx_dbi_open()
|
|
* [in] key The key to store in the database
|
|
* [in,out] data The data to store
|
|
* [in] flags Special options for this operation. This parameter must be
|
|
* set to 0 or by bitwise OR'ing together one or more of the
|
|
* values described here.
|
|
*
|
|
* - MDBX_NODUPDATA
|
|
* Enter the new key/data pair only if it does not already appear
|
|
* in the database. This flag may only be specified if the database
|
|
* was opened with MDBX_DUPSORT. The function will return MDBX_KEYEXIST
|
|
* if the key/data pair already appears in the database.
|
|
*
|
|
* - MDBX_NOOVERWRITE
|
|
* Enter the new key/data pair only if the key does not already appear
|
|
* in the database. The function will return MDBX_KEYEXIST if the key
|
|
* already appears in the database, even if the database supports
|
|
* duplicates (MDBX_DUPSORT). The data parameter will be set to point
|
|
* to the existing item.
|
|
*
|
|
* - MDBX_CURRENT
|
|
* Update an single existing entry, but not add new ones. The function
|
|
* will return MDBX_NOTFOUND if the given key not exist in the database.
|
|
* Or the MDBX_EMULTIVAL in case duplicates for the given key.
|
|
*
|
|
* - MDBX_RESERVE
|
|
* Reserve space for data of the given size, but don't copy the given
|
|
* data. Instead, return a pointer to the reserved space, which the
|
|
* caller can fill in later - before the next update operation or the
|
|
* transaction ends. This saves an extra memcpy if the data is being
|
|
* generated later. MDBX does nothing else with this memory, the caller
|
|
* is expected to modify all of the space requested. This flag must not
|
|
* be specified if the database was opened with MDBX_DUPSORT.
|
|
*
|
|
* - MDBX_APPEND
|
|
* Append the given key/data pair to the end of the database. This option
|
|
* allows fast bulk loading when keys are already known to be in the
|
|
* correct order. Loading unsorted keys with this flag will cause
|
|
* a MDBX_EKEYMISMATCH error.
|
|
*
|
|
* - MDBX_APPENDDUP
|
|
* As above, but for sorted dup data.
|
|
*
|
|
* Returns A non-zero error value on failure and 0 on success, some
|
|
* possible errors are:
|
|
* - MDBX_KEYEXIST
|
|
* - MDBX_MAP_FULL - the database is full, see mdbx_env_set_mapsize().
|
|
* - MDBX_TXN_FULL - the transaction has too many dirty pages.
|
|
* - MDBX_EACCES - an attempt was made to write in a read-only transaction.
|
|
* - MDBX_EINVAL - an invalid parameter was specified. */
|
|
LIBMDBX_API int mdbx_put(MDBX_txn *txn, MDBX_dbi dbi, MDBX_val *key,
|
|
MDBX_val *data, unsigned flags);
|
|
|
|
/* Delete items from a database.
|
|
*
|
|
* This function removes key/data pairs from the database.
|
|
*
|
|
* The data parameter is NOT ignored regardless the database does
|
|
* support sorted duplicate data items or not. If the data parameter
|
|
* is non-NULL only the matching data item will be deleted.
|
|
*
|
|
* This function will return MDBX_NOTFOUND if the specified key/data
|
|
* pair is not in the database.
|
|
*
|
|
* [in] txn A transaction handle returned by mdbx_txn_begin()
|
|
* [in] dbi A database handle returned by mdbx_dbi_open()
|
|
* [in] key The key to delete from the database
|
|
* [in] data The data to delete
|
|
*
|
|
* Returns A non-zero error value on failure and 0 on success, some
|
|
* possible errors are:
|
|
* - MDBX_EACCES - an attempt was made to write in a read-only transaction.
|
|
* - MDBX_EINVAL - an invalid parameter was specified. */
|
|
LIBMDBX_API int mdbx_del(MDBX_txn *txn, MDBX_dbi dbi, MDBX_val *key,
|
|
MDBX_val *data);
|
|
|
|
/* Create a cursor handle.
|
|
*
|
|
* A cursor is associated with a specific transaction and database.
|
|
* A cursor cannot be used when its database handle is closed. Nor
|
|
* when its transaction has ended, except with mdbx_cursor_renew().
|
|
* It can be discarded with mdbx_cursor_close().
|
|
*
|
|
* A cursor must be closed explicitly always, before
|
|
* or after its transaction ends. It can be reused with
|
|
* mdbx_cursor_renew() before finally closing it.
|
|
*
|
|
* [in] txn A transaction handle returned by mdbx_txn_begin()
|
|
* [in] dbi A database handle returned by mdbx_dbi_open()
|
|
* [out] cursor Address where the new MDBX_cursor handle will be stored
|
|
*
|
|
* Returns A non-zero error value on failure and 0 on success, some
|
|
* possible errors are:
|
|
* - MDBX_EINVAL - an invalid parameter was specified. */
|
|
LIBMDBX_API int mdbx_cursor_open(MDBX_txn *txn, MDBX_dbi dbi,
|
|
MDBX_cursor **cursor);
|
|
|
|
/* Close a cursor handle.
|
|
*
|
|
* The cursor handle will be freed and must not be used again after this call.
|
|
* Its transaction must still be live if it is a write-transaction.
|
|
*
|
|
* [in] cursor A cursor handle returned by mdbx_cursor_open() */
|
|
LIBMDBX_API void mdbx_cursor_close(MDBX_cursor *cursor);
|
|
|
|
/* Renew a cursor handle.
|
|
*
|
|
* A cursor is associated with a specific transaction and database.
|
|
* Cursors that are only used in read-only transactions may be re-used,
|
|
* to avoid unnecessary malloc/free overhead. The cursor may be associated
|
|
* with a new read-only transaction, and referencing the same database handle
|
|
* as it was created with.
|
|
*
|
|
* This may be done whether the previous transaction is live or dead.
|
|
* [in] txn A transaction handle returned by mdbx_txn_begin()
|
|
* [in] cursor A cursor handle returned by mdbx_cursor_open()
|
|
*
|
|
* Returns A non-zero error value on failure and 0 on success, some
|
|
* possible errors are:
|
|
* - MDBX_EINVAL - an invalid parameter was specified. */
|
|
LIBMDBX_API int mdbx_cursor_renew(MDBX_txn *txn, MDBX_cursor *cursor);
|
|
|
|
/* Return the cursor's transaction handle.
|
|
*
|
|
* [in] cursor A cursor handle returned by mdbx_cursor_open() */
|
|
LIBMDBX_API MDBX_txn *mdbx_cursor_txn(MDBX_cursor *cursor);
|
|
|
|
/* Return the cursor's database handle.
|
|
*
|
|
* [in] cursor A cursor handle returned by mdbx_cursor_open() */
|
|
LIBMDBX_API MDBX_dbi mdbx_cursor_dbi(MDBX_cursor *cursor);
|
|
|
|
/* Retrieve by cursor.
|
|
*
|
|
* This function retrieves key/data pairs from the database. The address and
|
|
* length of the key are returned in the object to which key refers (except
|
|
* for the case of the MDBX_SET option, in which the key object is unchanged),
|
|
* and the address and length of the data are returned in the object to which
|
|
* data refers. See mdbx_get() for restrictions on using the output values.
|
|
*
|
|
* [in] cursor A cursor handle returned by mdbx_cursor_open()
|
|
* [in,out] key The key for a retrieved item
|
|
* [in,out] data The data of a retrieved item
|
|
* [in] op A cursor operation MDBX_cursor_op
|
|
*
|
|
* Returns A non-zero error value on failure and 0 on success, some
|
|
* possible errors are:
|
|
* - MDBX_NOTFOUND - no matching key found.
|
|
* - MDBX_EINVAL - an invalid parameter was specified. */
|
|
LIBMDBX_API int mdbx_cursor_get(MDBX_cursor *cursor, MDBX_val *key,
|
|
MDBX_val *data, MDBX_cursor_op op);
|
|
|
|
/* Store by cursor.
|
|
*
|
|
* This function stores key/data pairs into the database. The cursor is
|
|
* positioned at the new item, or on failure usually near it.
|
|
*
|
|
* [in] cursor A cursor handle returned by mdbx_cursor_open()
|
|
* [in] key The key operated on.
|
|
* [in] data The data operated on.
|
|
* [in] flags Options for this operation. This parameter
|
|
* must be set to 0 or one of the values described here:
|
|
*
|
|
* - MDBX_CURRENT
|
|
* Replace the item at the current cursor position. The key parameter
|
|
* must still be provided, and must match it, otherwise the function
|
|
* return MDBX_EKEYMISMATCH.
|
|
*
|
|
* NOTE: MDBX unlike LMDB allows you to change the size of the data and
|
|
* automatically handles reordering for sorted duplicates (MDBX_DUPSORT).
|
|
*
|
|
* - MDBX_NODUPDATA
|
|
* Enter the new key/data pair only if it does not already appear in the
|
|
* database. This flag may only be specified if the database was opened
|
|
* with MDBX_DUPSORT. The function will return MDBX_KEYEXIST if the
|
|
* key/data pair already appears in the database.
|
|
*
|
|
* - MDBX_NOOVERWRITE
|
|
* Enter the new key/data pair only if the key does not already appear
|
|
* in the database. The function will return MDBX_KEYEXIST if the key
|
|
* already appears in the database, even if the database supports
|
|
* duplicates (MDBX_DUPSORT).
|
|
*
|
|
* - MDBX_RESERVE
|
|
* Reserve space for data of the given size, but don't copy the given
|
|
* data. Instead, return a pointer to the reserved space, which the
|
|
* caller can fill in later - before the next update operation or the
|
|
* transaction ends. This saves an extra memcpy if the data is being
|
|
* generated later. This flag must not be specified if the database
|
|
* was opened with MDBX_DUPSORT.
|
|
*
|
|
* - MDBX_APPEND
|
|
* Append the given key/data pair to the end of the database. No key
|
|
* comparisons are performed. This option allows fast bulk loading when
|
|
* keys are already known to be in the correct order. Loading unsorted
|
|
* keys with this flag will cause a MDBX_KEYEXIST error.
|
|
*
|
|
* - MDBX_APPENDDUP
|
|
* As above, but for sorted dup data.
|
|
*
|
|
* - MDBX_MULTIPLE
|
|
* Store multiple contiguous data elements in a single request. This flag
|
|
* may only be specified if the database was opened with MDBX_DUPFIXED.
|
|
* The data argument must be an array of two MDBX_vals. The iov_len of the
|
|
* first MDBX_val must be the size of a single data element. The iov_base
|
|
* of the first MDBX_val must point to the beginning of the array of
|
|
* contiguous data elements. The iov_len of the second MDBX_val must be
|
|
* the count of the number of data elements to store. On return this
|
|
* field will be set to the count of the number of elements actually
|
|
* written. The iov_base of the second MDBX_val is unused.
|
|
*
|
|
* Returns A non-zero error value on failure and 0 on success, some
|
|
* possible errors are:
|
|
* - MDBX_EKEYMISMATCH
|
|
* - MDBX_MAP_FULL - the database is full, see mdbx_env_set_mapsize().
|
|
* - MDBX_TXN_FULL - the transaction has too many dirty pages.
|
|
* - MDBX_EACCES - an attempt was made to write in a read-only transaction.
|
|
* - MDBX_EINVAL - an invalid parameter was specified. */
|
|
LIBMDBX_API int mdbx_cursor_put(MDBX_cursor *cursor, MDBX_val *key,
|
|
MDBX_val *data, unsigned flags);
|
|
|
|
/* Delete current key/data pair
|
|
*
|
|
* This function deletes the key/data pair to which the cursor refers.
|
|
* This does not invalidate the cursor, so operations such as MDBX_NEXT
|
|
* can still be used on it. Both MDBX_NEXT and MDBX_GET_CURRENT will return
|
|
* the same record after this operation.
|
|
*
|
|
* [in] cursor A cursor handle returned by mdbx_cursor_open()
|
|
* [in] flags Options for this operation. This parameter must be set to 0
|
|
* or one of the values described here.
|
|
*
|
|
* - MDBX_NODUPDATA
|
|
* Delete all of the data items for the current key. This flag may only
|
|
* be specified if the database was opened with MDBX_DUPSORT.
|
|
*
|
|
* Returns A non-zero error value on failure and 0 on success, some
|
|
* possible errors are:
|
|
* - MDBX_EACCES - an attempt was made to write in a read-only transaction.
|
|
* - MDBX_EINVAL - an invalid parameter was specified. */
|
|
LIBMDBX_API int mdbx_cursor_del(MDBX_cursor *cursor, unsigned flags);
|
|
|
|
/* Return count of duplicates for current key.
|
|
*
|
|
* This call is only valid on databases that support sorted duplicate data
|
|
* items MDBX_DUPSORT.
|
|
*
|
|
* [in] cursor A cursor handle returned by mdbx_cursor_open()
|
|
* [out] countp Address where the count will be stored
|
|
*
|
|
* Returns A non-zero error value on failure and 0 on success, some
|
|
* possible errors are:
|
|
* - MDBX_EINVAL - cursor is not initialized, or an invalid parameter
|
|
* was specified. */
|
|
LIBMDBX_API int mdbx_cursor_count(MDBX_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
|
|
* specified database.
|
|
*
|
|
* [in] txn A transaction handle returned by mdbx_txn_begin()
|
|
* [in] dbi A database handle returned by mdbx_dbi_open()
|
|
* [in] a The first item to compare
|
|
* [in] b The second item to compare
|
|
*
|
|
* Returns < 0 if a < b, 0 if a == b, > 0 if a > b */
|
|
LIBMDBX_API int mdbx_cmp(MDBX_txn *txn, MDBX_dbi dbi, const MDBX_val *a,
|
|
const MDBX_val *b);
|
|
|
|
/* Compare two data items according to a particular database.
|
|
*
|
|
* This returns a comparison as if the two items were data items of
|
|
* the specified database. The database must have the MDBX_DUPSORT flag.
|
|
*
|
|
* [in] txn A transaction handle returned by mdbx_txn_begin()
|
|
* [in] dbi A database handle returned by mdbx_dbi_open()
|
|
* [in] a The first item to compare
|
|
* [in] b The second item to compare
|
|
*
|
|
* Returns < 0 if a < b, 0 if a == b, > 0 if a > b */
|
|
LIBMDBX_API int mdbx_dcmp(MDBX_txn *txn, MDBX_dbi dbi, const MDBX_val *a,
|
|
const MDBX_val *b);
|
|
|
|
/* A callback function used to print a message from the library.
|
|
*
|
|
* [in] msg The string to be printed.
|
|
* [in] ctx An arbitrary context pointer for the callback.
|
|
*
|
|
* Returns < 0 on failure, >= 0 on success. */
|
|
typedef int(MDBX_msg_func)(const char *msg, void *ctx);
|
|
|
|
/* Dump the entries in the reader lock table.
|
|
*
|
|
* [in] env An environment handle returned by mdbx_env_create()
|
|
* [in] func A MDBX_msg_func function
|
|
* [in] ctx Anything the message function needs
|
|
*
|
|
* Returns < 0 on failure, >= 0 on success. */
|
|
LIBMDBX_API int mdbx_reader_list(MDBX_env *env, MDBX_msg_func *func, void *ctx);
|
|
|
|
/* Check for stale entries in the reader lock table.
|
|
*
|
|
* [in] env An environment handle returned by mdbx_env_create()
|
|
* [out] dead Number of stale slots that were cleared
|
|
*
|
|
* Returns 0 on success, non-zero on failure. */
|
|
LIBMDBX_API int mdbx_reader_check(MDBX_env *env, int *dead);
|
|
|
|
LIBMDBX_API char *mdbx_dkey(const MDBX_val *key, char *const buf,
|
|
const size_t bufsize);
|
|
|
|
LIBMDBX_API int mdbx_env_close_ex(MDBX_env *env, int dont_sync);
|
|
|
|
/* Sets threshold to force flush the data buffers to disk,
|
|
* even of MDBX_NOSYNC, MDBX_NOMETASYNC and MDBX_MAPASYNC flags
|
|
* in the environment. The value affects all processes which operates with given
|
|
* DB until the last process close DB or a new value will be settled.
|
|
*
|
|
* Data is always written to disk when mdbx_txn_commit() is called,
|
|
* but the operating system may keep it buffered. MDBX always flushes
|
|
* the OS buffers upon commit as well, unless the environment was
|
|
* opened with MDBX_NOSYNC, MDBX_MAPASYNC or in part MDBX_NOMETASYNC.
|
|
*
|
|
* The default is 0, than mean no any threshold checked, and no additional
|
|
* flush will be made.
|
|
*
|
|
* [in] env An environment handle returned by mdbx_env_create()
|
|
* [in] bytes The size in bytes of summary changes when a synchronous
|
|
* flush would be made.
|
|
*
|
|
* Returns A non-zero error value on failure and 0 on success. */
|
|
LIBMDBX_API int mdbx_env_set_syncbytes(MDBX_env *env, size_t bytes);
|
|
|
|
/* Sets relative period since the last unsteay commit to force flush the data
|
|
* buffers to disk, even of MDBX_NOSYNC, MDBX_NOMETASYNC and MDBX_MAPASYNC flags
|
|
* in the environment. The value affects all processes which operates with given
|
|
* DB until the last process close DB or a new value will be settled.
|
|
*
|
|
* Data is always written to disk when mdbx_txn_commit() is called,
|
|
* but the operating system may keep it buffered. MDBX always flushes
|
|
* the OS buffers upon commit as well, unless the environment was
|
|
* opened with MDBX_NOSYNC, MDBX_MAPASYNC or in part MDBX_NOMETASYNC.
|
|
*
|
|
* Settled period don't checked asynchronously, but only inside the functions.
|
|
* mdbx_txn_commit() and mdbx_env_sync(). Therefore, in cases where transactions
|
|
* are committed infrequently and/or irregularly, polling by mdbx_env_sync() may
|
|
* be a reasonable solution to timeout enforcement.
|
|
*
|
|
* The default is 0, than mean no any timeout checked, and no additional
|
|
* flush will be made.
|
|
*
|
|
* [in] env An environment handle returned by mdbx_env_create()
|
|
* [in] seconds_16dot16 The period in 1/65536 of second when a synchronous
|
|
* flush would be made since the last unsteay commit.
|
|
*
|
|
* Returns A non-zero error value on failure and 0 on success. */
|
|
LIBMDBX_API int mdbx_env_set_syncperiod(MDBX_env *env,
|
|
unsigned seconds_16dot16);
|
|
|
|
/* Returns a lag of the reading for the given transaction.
|
|
*
|
|
* Returns an information for estimate how much given read-only
|
|
* transaction is lagging relative the to actual head.
|
|
*
|
|
* [in] txn A transaction handle returned by mdbx_txn_begin()
|
|
* [out] percent Percentage of page allocation in the database.
|
|
*
|
|
* Returns Number of transactions committed after the given was started for
|
|
* read, or negative value on failure. */
|
|
LIBMDBX_API int mdbx_txn_straggler(MDBX_txn *txn, int *percent);
|
|
|
|
/* A callback function for killing a laggard readers,
|
|
* but also could waiting ones. Called in case of MDBX_MAP_FULL error.
|
|
*
|
|
* [in] env An environment handle returned by mdbx_env_create().
|
|
* [in] pid pid of the reader process.
|
|
* [in] tid thread_id of the reader thread.
|
|
* [in] txn Transaction number on which stalled.
|
|
* [in] gap A lag from the last commited txn.
|
|
* [in] retry A retry number, less that zero for notify end of OOM-loop.
|
|
*
|
|
* Returns -1 on failure (reader is not killed),
|
|
* 0 should wait or retry,
|
|
* 1 drop reader txn-lock (reading-txn was aborted),
|
|
* >1 drop reader registration (reader process was killed). */
|
|
typedef int(MDBX_oom_func)(MDBX_env *env, int pid, mdbx_tid_t tid, uint64_t txn,
|
|
unsigned gap, int retry);
|
|
|
|
/* Set the OOM callback.
|
|
*
|
|
* Callback will be called only on out-of-pages case for killing
|
|
* a laggard readers to allowing reclaiming of freeDB.
|
|
*
|
|
* [in] env An environment handle returned by mdbx_env_create().
|
|
* [in] oomfunc A MDBX_oom_func function or NULL to disable.
|
|
*
|
|
* Returns A non-zero error value on failure and 0 on success. */
|
|
LIBMDBX_API int mdbx_env_set_oomfunc(MDBX_env *env, MDBX_oom_func *oom_func);
|
|
|
|
/* Get the current oom_func callback.
|
|
*
|
|
* Callback will be called only on out-of-pages case for killing
|
|
* a laggard readers to allowing reclaiming of freeDB.
|
|
*
|
|
* [in] env An environment handle returned by mdbx_env_create().
|
|
*
|
|
* Returns A MDBX_oom_func function or NULL if disabled. */
|
|
LIBMDBX_API MDBX_oom_func *mdbx_env_get_oomfunc(MDBX_env *env);
|
|
|
|
#define MDBX_DBG_ASSERT 1
|
|
#define MDBX_DBG_PRINT 2
|
|
#define MDBX_DBG_TRACE 4
|
|
#define MDBX_DBG_EXTRA 8
|
|
#define MDBX_DBG_AUDIT 16
|
|
#define MDBX_DBG_JITTER 32
|
|
#define MDBX_DBG_DUMP 64
|
|
#define MDBX_DBG_LEGACY_MULTIOPEN 128
|
|
|
|
typedef void MDBX_debug_func(int type, const char *function, int line,
|
|
const char *msg, va_list args);
|
|
|
|
LIBMDBX_API int mdbx_setup_debug(int flags, MDBX_debug_func *logger);
|
|
|
|
typedef enum {
|
|
MDBX_page_void,
|
|
MDBX_page_meta,
|
|
MDBX_page_large,
|
|
MDBX_page_branch,
|
|
MDBX_page_leaf,
|
|
MDBX_page_dupfixed_leaf,
|
|
MDBX_subpage_leaf,
|
|
MDBX_subpage_dupfixed_leaf
|
|
} MDBX_page_type_t;
|
|
|
|
#define MDBX_PGWALK_MAIN ((const char *)((ptrdiff_t)0))
|
|
#define MDBX_PGWALK_GC ((const char *)((ptrdiff_t)-1))
|
|
#define MDBX_PGWALK_META ((const char *)((ptrdiff_t)-2))
|
|
|
|
typedef int
|
|
MDBX_pgvisitor_func(const uint64_t pgno, const unsigned number, void *const ctx,
|
|
const int deep, const char *const dbi,
|
|
const size_t page_size, const MDBX_page_type_t type,
|
|
const size_t nentries, const size_t payload_bytes,
|
|
const size_t header_bytes, const size_t unused_bytes);
|
|
LIBMDBX_API int mdbx_env_pgwalk(MDBX_txn *txn, MDBX_pgvisitor_func *visitor,
|
|
void *ctx);
|
|
|
|
typedef struct mdbx_canary {
|
|
uint64_t x, y, z, v;
|
|
} mdbx_canary;
|
|
|
|
LIBMDBX_API int mdbx_canary_put(MDBX_txn *txn, const mdbx_canary *canary);
|
|
LIBMDBX_API int mdbx_canary_get(MDBX_txn *txn, mdbx_canary *canary);
|
|
|
|
/* Returns:
|
|
* - MDBX_RESULT_TRUE
|
|
* when no more data available or cursor not positioned;
|
|
* - MDBX_RESULT_FALSE
|
|
* when data available;
|
|
* - Otherwise the error code. */
|
|
LIBMDBX_API int mdbx_cursor_eof(MDBX_cursor *mc);
|
|
|
|
/* Returns: MDBX_RESULT_TRUE, MDBX_RESULT_FALSE or Error code. */
|
|
LIBMDBX_API int mdbx_cursor_on_first(MDBX_cursor *mc);
|
|
|
|
/* Returns: MDBX_RESULT_TRUE, MDBX_RESULT_FALSE or Error code. */
|
|
LIBMDBX_API int mdbx_cursor_on_last(MDBX_cursor *mc);
|
|
|
|
/* Estimates the distance between cursors as the number of elements.
|
|
* Both cursors must be initialized for the same DBI.
|
|
*
|
|
* [in] cursor_a The first cursor for estimation.
|
|
* [in] cursor_b The second cursor for estimation.
|
|
* [out] distance_items A pointer to store estimated distance value,
|
|
* i.e. *distance_items = distance(a - b).
|
|
*
|
|
* Returns A non-zero error value on failure and 0 on success. */
|
|
LIBMDBX_API int mdbx_estimate_distance(const MDBX_cursor *first,
|
|
const MDBX_cursor *last,
|
|
ptrdiff_t *distance_items);
|
|
|
|
/* Estimates the move distance, i.e. between the current cursor position and
|
|
* next position after the specified move-operation with given key and data.
|
|
* Current cursor position and state are preserved.
|
|
*
|
|
* [in] cursor Cursor for estimation.
|
|
* [in,out] key The key for a retrieved item.
|
|
* [in,out] data The data of a retrieved item.
|
|
* [in] op A cursor operation MDBX_cursor_op.
|
|
* [out] distance_items A pointer to store estimated move distance
|
|
* as the number of elements.
|
|
*
|
|
* Returns A non-zero error value on failure and 0 on success. */
|
|
LIBMDBX_API int mdbx_estimate_move(const MDBX_cursor *cursor, MDBX_val *key,
|
|
MDBX_val *data, MDBX_cursor_op move_op,
|
|
ptrdiff_t *distance_items);
|
|
|
|
/* Estimates the size of a range in the number of elements.
|
|
*
|
|
* [in] txn A transaction handle returned by mdbx_txn_begin().
|
|
* [in] dbi A database handle returned by mdbx_dbi_open().
|
|
* [in] begin_key The key of range beginning or NULL for explicit FIRST.
|
|
* [in] begin_data Optional additional data to seeking among sorted
|
|
* duplicates. Only for MDBX_DUPSORT, NULL otherwise.
|
|
* [in] end_key The key of range ending or NULL for explicit LAST.
|
|
* [in] end_data Optional additional data to seeking among sorted
|
|
* duplicates. Only for MDBX_DUPSORT, NULL otherwise.
|
|
* [out] distance_items A pointer to store range estimation result.
|
|
*
|
|
* Returns A non-zero error value on failure and 0 on success. */
|
|
#define MDBX_EPSILON ((MDBX_val *)((ptrdiff_t)-1))
|
|
LIBMDBX_API int mdbx_estimate_range(MDBX_txn *txn, MDBX_dbi dbi,
|
|
MDBX_val *begin_key, MDBX_val *begin_data,
|
|
MDBX_val *end_key, MDBX_val *end_data,
|
|
ptrdiff_t *size_items);
|
|
|
|
LIBMDBX_API int mdbx_replace(MDBX_txn *txn, MDBX_dbi dbi, MDBX_val *key,
|
|
MDBX_val *new_data, MDBX_val *old_data,
|
|
unsigned flags);
|
|
/* Same as mdbx_get(), but:
|
|
* 1) if values_count is not NULL, then returns the count
|
|
* of multi-values/duplicates for a given key.
|
|
* 2) updates the key for pointing to the actual key's data inside DB. */
|
|
LIBMDBX_API int mdbx_get_ex(MDBX_txn *txn, MDBX_dbi dbi, MDBX_val *key,
|
|
MDBX_val *data, size_t *values_count);
|
|
|
|
LIBMDBX_API int mdbx_is_dirty(const MDBX_txn *txn, const void *ptr);
|
|
|
|
LIBMDBX_API int mdbx_dbi_sequence(MDBX_txn *txn, MDBX_dbi dbi, uint64_t *result,
|
|
uint64_t increment);
|
|
|
|
/*----------------------------------------------------------------------------*/
|
|
/* attribute support functions for Nexenta */
|
|
typedef uint_fast64_t mdbx_attr_t;
|
|
|
|
/* Store by cursor with attribute.
|
|
*
|
|
* This function stores key/data pairs into the database. The cursor is
|
|
* positioned at the new item, or on failure usually near it.
|
|
*
|
|
* NOTE: Internally based on MDBX_RESERVE feature,
|
|
* therefore doesn't support MDBX_DUPSORT.
|
|
*
|
|
* [in] cursor A cursor handle returned by mdbx_cursor_open()
|
|
* [in] key The key operated on.
|
|
* [in] data The data operated on.
|
|
* [in] attr The attribute.
|
|
* [in] flags Options for this operation. This parameter must be set to 0
|
|
* or one of the values described here:
|
|
*
|
|
* - MDBX_CURRENT
|
|
* Replace the item at the current cursor position. The key parameter
|
|
* must still be provided, and must match it, otherwise the function
|
|
* return MDBX_EKEYMISMATCH.
|
|
*
|
|
* - MDBX_APPEND
|
|
* Append the given key/data pair to the end of the database. No key
|
|
* comparisons are performed. This option allows fast bulk loading when
|
|
* keys are already known to be in the correct order. Loading unsorted
|
|
* keys with this flag will cause a MDBX_KEYEXIST error.
|
|
*
|
|
* Returns A non-zero error value on failure and 0 on success, some
|
|
* possible errors are:
|
|
* - MDBX_EKEYMISMATCH
|
|
* - MDBX_MAP_FULL - the database is full, see mdbx_env_set_mapsize().
|
|
* - MDBX_TXN_FULL - the transaction has too many dirty pages.
|
|
* - MDBX_EACCES - an attempt was made to write in a read-only transaction.
|
|
* - MDBX_EINVAL - an invalid parameter was specified. */
|
|
LIBMDBX_API int mdbx_cursor_put_attr(MDBX_cursor *cursor, MDBX_val *key,
|
|
MDBX_val *data, mdbx_attr_t attr,
|
|
unsigned flags);
|
|
|
|
/* Store items and attributes into a database.
|
|
*
|
|
* This function stores key/data pairs in the database. The default behavior
|
|
* is to enter the new key/data pair, replacing any previously existing key
|
|
* if duplicates are disallowed.
|
|
*
|
|
* NOTE: Internally based on MDBX_RESERVE feature,
|
|
* therefore doesn't support MDBX_DUPSORT.
|
|
*
|
|
* [in] txn A transaction handle returned by mdbx_txn_begin().
|
|
* [in] dbi A database handle returned by mdbx_dbi_open().
|
|
* [in] key The key to store in the database.
|
|
* [in] attr The attribute to store in the database.
|
|
* [in,out] data The data to store.
|
|
* [in] flags Special options for this operation. This parameter must be
|
|
* set to 0 or by bitwise OR'ing together one or more of the
|
|
* values described here:
|
|
*
|
|
* - MDBX_NOOVERWRITE
|
|
* Enter the new key/data pair only if the key does not already appear
|
|
* in the database. The function will return MDBX_KEYEXIST if the key
|
|
* already appears in the database. The data parameter will be set to
|
|
* point to the existing item.
|
|
*
|
|
* - MDBX_CURRENT
|
|
* Update an single existing entry, but not add new ones. The function
|
|
* will return MDBX_NOTFOUND if the given key not exist in the database.
|
|
* Or the MDBX_EMULTIVAL in case duplicates for the given key.
|
|
*
|
|
* - MDBX_APPEND
|
|
* Append the given key/data pair to the end of the database. This option
|
|
* allows fast bulk loading when keys are already known to be in the
|
|
* correct order. Loading unsorted keys with this flag will cause
|
|
* a MDBX_EKEYMISMATCH error.
|
|
*
|
|
* Returns A non-zero error value on failure and 0 on success, some
|
|
* possible errors are:
|
|
* - MDBX_KEYEXIST
|
|
* - MDBX_MAP_FULL - the database is full, see mdbx_env_set_mapsize().
|
|
* - MDBX_TXN_FULL - the transaction has too many dirty pages.
|
|
* - MDBX_EACCES - an attempt was made to write in a read-only transaction.
|
|
* - MDBX_EINVAL - an invalid parameter was specified. */
|
|
LIBMDBX_API int mdbx_put_attr(MDBX_txn *txn, MDBX_dbi dbi, MDBX_val *key,
|
|
MDBX_val *data, mdbx_attr_t attr, unsigned flags);
|
|
|
|
/* Set items attribute from a database.
|
|
*
|
|
* This function stores key/data pairs attribute to the database.
|
|
*
|
|
* NOTE: Internally based on MDBX_RESERVE feature,
|
|
* therefore doesn't support MDBX_DUPSORT.
|
|
*
|
|
* [in] txn A transaction handle returned by mdbx_txn_begin().
|
|
* [in] dbi A database handle returned by mdbx_dbi_open().
|
|
* [in] key The key to search for in the database.
|
|
* [in] data The data to be stored or NULL to save previous value.
|
|
* [in] attr The attribute to be stored.
|
|
*
|
|
* Returns A non-zero error value on failure and 0 on success, some
|
|
* possible errors are:
|
|
* - MDBX_NOTFOUND - the key-value pair was not in the database.
|
|
* - MDBX_EINVAL - an invalid parameter was specified. */
|
|
LIBMDBX_API int mdbx_set_attr(MDBX_txn *txn, MDBX_dbi dbi, MDBX_val *key,
|
|
MDBX_val *data, mdbx_attr_t attr);
|
|
|
|
/* Get items attribute from a database cursor.
|
|
*
|
|
* This function retrieves key/data pairs from the database. The address and
|
|
* length of the key are returned in the object to which key refers (except
|
|
* for the case of the MDBX_SET option, in which the key object is unchanged),
|
|
* and the address and length of the data are returned in the object to which
|
|
* data refers. See mdbx_get() for restrictions on using the output values.
|
|
*
|
|
* [in] cursor A cursor handle returned by mdbx_cursor_open()
|
|
* [in,out] key The key for a retrieved item
|
|
* [in,out] data The data of a retrieved item
|
|
* [in] op A cursor operation MDBX_cursor_op
|
|
*
|
|
* Returns A non-zero error value on failure and 0 on success, some
|
|
* possible errors are:
|
|
* - MDBX_NOTFOUND - no matching key found.
|
|
* - MDBX_EINVAL - an invalid parameter was specified. */
|
|
LIBMDBX_API int mdbx_cursor_get_attr(MDBX_cursor *mc, MDBX_val *key,
|
|
MDBX_val *data, mdbx_attr_t *attrptr,
|
|
MDBX_cursor_op op);
|
|
|
|
/* Get items attribute from a database.
|
|
*
|
|
* This function retrieves key/data pairs from the database. The address
|
|
* and length of the data associated with the specified key are returned
|
|
* in the structure to which data refers.
|
|
* If the database supports duplicate keys (MDBX_DUPSORT) then the
|
|
* first data item for the key will be returned. Retrieval of other
|
|
* items requires the use of mdbx_cursor_get().
|
|
*
|
|
* NOTE: The memory pointed to by the returned values is owned by the
|
|
* database. The caller need not dispose of the memory, and may not
|
|
* modify it in any way. For values returned in a read-only transaction
|
|
* any modification attempts will cause a SIGSEGV.
|
|
*
|
|
* NOTE: Values returned from the database are valid only until a
|
|
* subsequent update operation, or the end of the transaction.
|
|
*
|
|
* [in] txn A transaction handle returned by mdbx_txn_begin()
|
|
* [in] dbi A database handle returned by mdbx_dbi_open()
|
|
* [in] key The key to search for in the database
|
|
* [in,out] data The data corresponding to the key
|
|
*
|
|
* Returns A non-zero error value on failure and 0 on success, some
|
|
* possible errors are:
|
|
* - MDBX_NOTFOUND - the key was not in the database.
|
|
* - MDBX_EINVAL - an invalid parameter was specified. */
|
|
LIBMDBX_API int mdbx_get_attr(MDBX_txn *txn, MDBX_dbi dbi, MDBX_val *key,
|
|
MDBX_val *data, mdbx_attr_t *attrptr);
|
|
|
|
/*----------------------------------------------------------------------------*/
|
|
/* LY: temporary workaround for Elbrus's memcmp() bug. */
|
|
#ifndef __GLIBC_PREREQ
|
|
#if defined(__GLIBC__) && defined(__GLIBC_MINOR__)
|
|
#define __GLIBC_PREREQ(maj, min) \
|
|
((__GLIBC__ << 16) + __GLIBC_MINOR__ >= ((maj) << 16) + (min))
|
|
#else
|
|
#define __GLIBC_PREREQ(maj, min) (0)
|
|
#endif
|
|
#endif /* __GLIBC_PREREQ */
|
|
#if defined(__e2k__) && !__GLIBC_PREREQ(2, 24)
|
|
LIBMDBX_API int mdbx_e2k_memcmp_bug_workaround(const void *s1, const void *s2,
|
|
size_t n);
|
|
LIBMDBX_API int mdbx_e2k_strcmp_bug_workaround(const char *s1, const char *s2);
|
|
LIBMDBX_API int mdbx_e2k_strncmp_bug_workaround(const char *s1, const char *s2,
|
|
size_t n);
|
|
LIBMDBX_API size_t mdbx_e2k_strlen_bug_workaround(const char *s);
|
|
LIBMDBX_API size_t mdbx_e2k_strnlen_bug_workaround(const char *s,
|
|
size_t maxlen);
|
|
#include <string.h>
|
|
#include <strings.h>
|
|
#undef memcmp
|
|
#define memcmp mdbx_e2k_memcmp_bug_workaround
|
|
#undef bcmp
|
|
#define bcmp mdbx_e2k_memcmp_bug_workaround
|
|
#undef strcmp
|
|
#define strcmp mdbx_e2k_strcmp_bug_workaround
|
|
#undef strncmp
|
|
#define strncmp mdbx_e2k_strncmp_bug_workaround
|
|
#undef strlen
|
|
#define strlen mdbx_e2k_strlen_bug_workaround
|
|
#undef strnlen
|
|
#define strnlen mdbx_e2k_strnlen_bug_workaround
|
|
|
|
#endif /* Elbrus's memcmp() bug. */
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif /* LIBMDBX_H */
|