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NAME

       lmdb.h - Lightning memory-mapped database library.

SYNOPSIS

       #include <sys/types.h>

   Data Structures
       struct MDB_val
           Generic structure used for passing keys and data in and out of the database.
       struct MDB_stat
           Statistics for a database in the environment.
       struct MDB_envinfo
           Information about the environment.

   Macros
       #define MDB_VERSION_MAJOR   0
       #define MDB_VERSION_MINOR   9
       #define MDB_VERSION_PATCH   21
       #define MDB_VERINT(a,  b,  c)   (((a) << 24) | ((b) << 16) | (c))
       #define MDB_VERSION_FULL
           MDB_VERINT(MDB_VERSION_MAJOR,MDB_VERSION_MINOR,MDB_VERSION_PATCH)
       #define MDB_VERSION_DATE   'June 1, 2017'
       #define MDB_VERSTR(a,  b,  c,  d)   'LMDB ' #a '.' #b '.' #c ': (' d ')'
       #define MDB_VERFOO(a,  b,  c,  d)   MDB_VERSTR(a,b,c,d)
       #define MDB_VERSION_STRING
           MDB_VERFOO(MDB_VERSION_MAJOR,MDB_VERSION_MINOR,MDB_VERSION_PATCH,MDB_VERSION_DATE)
       #define MDB_FIXEDMAP   0x01
       #define MDB_NOSUBDIR   0x4000
       #define MDB_NOSYNC   0x10000
       #define MDB_RDONLY   0x20000
       #define MDB_NOMETASYNC   0x40000
       #define MDB_WRITEMAP   0x80000
       #define MDB_MAPASYNC   0x100000
       #define MDB_NOTLS   0x200000
       #define MDB_NOLOCK   0x400000
       #define MDB_NORDAHEAD   0x800000
       #define MDB_NOMEMINIT   0x1000000
       #define MDB_REVERSEKEY   0x02
       #define MDB_DUPSORT   0x04
       #define MDB_INTEGERKEY   0x08
       #define MDB_DUPFIXED   0x10
       #define MDB_INTEGERDUP   0x20
       #define MDB_REVERSEDUP   0x40
       #define MDB_CREATE   0x40000
       #define MDB_NOOVERWRITE   0x10
       #define MDB_NODUPDATA   0x20
       #define MDB_CURRENT   0x40
       #define MDB_RESERVE   0x10000
       #define MDB_APPEND   0x20000
       #define MDB_APPENDDUP   0x40000
       #define MDB_MULTIPLE   0x80000
       #define MDB_CP_COMPACT   0x01
       #define MDB_SUCCESS   0
       #define MDB_KEYEXIST   (-30799)
       #define MDB_NOTFOUND   (-30798)
       #define MDB_PAGE_NOTFOUND   (-30797)
       #define MDB_CORRUPTED   (-30796)
       #define MDB_PANIC   (-30795)
       #define MDB_VERSION_MISMATCH   (-30794)
       #define MDB_INVALID   (-30793)
       #define MDB_MAP_FULL   (-30792)
       #define MDB_DBS_FULL   (-30791)
       #define MDB_READERS_FULL   (-30790)
       #define MDB_TLS_FULL   (-30789)
       #define MDB_TXN_FULL   (-30788)
       #define MDB_CURSOR_FULL   (-30787)
       #define MDB_PAGE_FULL   (-30786)
       #define MDB_MAP_RESIZED   (-30785)
       #define MDB_INCOMPATIBLE   (-30784)
       #define MDB_BAD_RSLOT   (-30783)
       #define MDB_BAD_TXN   (-30782)
       #define MDB_BAD_VALSIZE   (-30781)
       #define MDB_BAD_DBI   (-30780)
       #define MDB_LAST_ERRCODE   MDB_BAD_DBI
       #define mdb_open(txn,  name,  flags,  dbi)   mdb_dbi_open(txn,name,flags,dbi)
       #define mdb_close(env,  dbi)   mdb_dbi_close(env,dbi)

   Typedefs
       typedef mode_t mdb_mode_t
       typedef int mdb_filehandle_t
       typedef unsigned int MDB_dbi
           A handle for an individual database in the DB environment.
       typedef int() MDB_cmp_func(const MDB_val *a, const MDB_val *b)
           A callback function used to compare two keys in a database.
       typedef void() MDB_rel_func(MDB_val *item, void *oldptr, void *newptr, void *relctx)
           A callback function used to relocate a position-dependent data item in a fixed-address
           database.
       typedef void MDB_assert_func(MDB_env *env, const char *msg)
           A callback function for most LMDB assert() failures, called before printing the
           message and aborting.
       typedef int() MDB_msg_func(const char *msg, void *ctx)
           A callback function used to print a message from the library.

   Enumerations
       enum MDB_cursor_op { MDB_FIRST, MDB_FIRST_DUP, MDB_GET_BOTH, MDB_GET_BOTH_RANGE,
           MDB_GET_CURRENT, MDB_GET_MULTIPLE, MDB_LAST, MDB_LAST_DUP, MDB_NEXT, MDB_NEXT_DUP,
           MDB_NEXT_MULTIPLE, MDB_NEXT_NODUP, MDB_PREV, MDB_PREV_DUP, MDB_PREV_NODUP, MDB_SET,
           MDB_SET_KEY, MDB_SET_RANGE, MDB_PREV_MULTIPLE } Cursor Get operations. "

   Functions
       char * mdb_version (int *major, int *minor, int *patch)
           Return the LMDB library version information.
       char * mdb_strerror (int err)
           Return a string describing a given error code.
       int mdb_env_create (MDB_env **env)
           Create an LMDB environment handle.
       int mdb_env_open (MDB_env *env, const char *path, unsigned int flags, mdb_mode_t mode)
           Open an environment handle.
       int mdb_env_copy (MDB_env *env, const char *path)
           Copy an LMDB environment to the specified path.
       int mdb_env_copyfd (MDB_env *env, mdb_filehandle_t fd)
           Copy an LMDB environment to the specified file descriptor.
       int mdb_env_copy2 (MDB_env *env, const char *path, unsigned int flags)
           Copy an LMDB environment to the specified path, with options.
       int mdb_env_copyfd2 (MDB_env *env, mdb_filehandle_t fd, unsigned int flags)
           Copy an LMDB environment to the specified file descriptor, with options.
       int mdb_env_stat (MDB_env *env, MDB_stat *stat)
           Return statistics about the LMDB environment.
       int mdb_env_info (MDB_env *env, MDB_envinfo *stat)
           Return information about the LMDB environment.
       int mdb_env_sync (MDB_env *env, int force)
           Flush the data buffers to disk.
       void mdb_env_close (MDB_env *env)
           Close the environment and release the memory map.
       int mdb_env_set_flags (MDB_env *env, unsigned int flags, int onoff)
           Set environment flags.
       int mdb_env_get_flags (MDB_env *env, unsigned int *flags)
           Get environment flags.
       int mdb_env_get_path (MDB_env *env, const char **path)
           Return the path that was used in mdb_env_open().
       int mdb_env_get_fd (MDB_env *env, mdb_filehandle_t *fd)
           Return the filedescriptor for the given environment.
       int mdb_env_set_mapsize (MDB_env *env, size_t size)
           Set the size of the memory map to use for this environment.
       int mdb_env_set_maxreaders (MDB_env *env, unsigned int readers)
           Set the maximum number of threads/reader slots for the environment.
       int mdb_env_get_maxreaders (MDB_env *env, unsigned int *readers)
           Get the maximum number of threads/reader slots for the environment.
       int mdb_env_set_maxdbs (MDB_env *env, MDB_dbi dbs)
           Set the maximum number of named databases for the environment.
       int mdb_env_get_maxkeysize (MDB_env *env)
           Get the maximum size of keys and MDB_DUPSORT data we can write.
       int mdb_env_set_userctx (MDB_env *env, void *ctx)
           Set application information associated with the MDB_env.
       void * mdb_env_get_userctx (MDB_env *env)
           Get the application information associated with the MDB_env.
       int mdb_env_set_assert (MDB_env *env, MDB_assert_func *func)
       int mdb_txn_begin (MDB_env *env, MDB_txn *parent, unsigned int flags, MDB_txn **txn)
           Create a transaction for use with the environment.
       MDB_env * mdb_txn_env (MDB_txn *txn)
           Returns the transaction's MDB_env.
       size_t mdb_txn_id (MDB_txn *txn)
           Return the transaction's ID.
       int mdb_txn_commit (MDB_txn *txn)
           Commit all the operations of a transaction into the database.
       void mdb_txn_abort (MDB_txn *txn)
           Abandon all the operations of the transaction instead of saving them.
       void mdb_txn_reset (MDB_txn *txn)
           Reset a read-only transaction.
       int mdb_txn_renew (MDB_txn *txn)
           Renew a read-only transaction.
       int mdb_dbi_open (MDB_txn *txn, const char *name, unsigned int flags, MDB_dbi *dbi)
           Open a database in the environment.
       int mdb_stat (MDB_txn *txn, MDB_dbi dbi, MDB_stat *stat)
           Retrieve statistics for a database.
       int mdb_dbi_flags (MDB_txn *txn, MDB_dbi dbi, unsigned int *flags)
           Retrieve the DB flags for a database handle.
       void mdb_dbi_close (MDB_env *env, MDB_dbi dbi)
           Close a database handle. Normally unnecessary. Use with care:
       int mdb_drop (MDB_txn *txn, MDB_dbi dbi, int del)
           Empty or delete+close a database.
       int mdb_set_compare (MDB_txn *txn, MDB_dbi dbi, MDB_cmp_func *cmp)
           Set a custom key comparison function for a database.
       int mdb_set_dupsort (MDB_txn *txn, MDB_dbi dbi, MDB_cmp_func *cmp)
           Set a custom data comparison function for a MDB_DUPSORT database.
       int mdb_set_relfunc (MDB_txn *txn, MDB_dbi dbi, MDB_rel_func *rel)
           Set a relocation function for a MDB_FIXEDMAP database.
       int mdb_set_relctx (MDB_txn *txn, MDB_dbi dbi, void *ctx)
           Set a context pointer for a MDB_FIXEDMAP database's relocation function.
       int mdb_get (MDB_txn *txn, MDB_dbi dbi, MDB_val *key, MDB_val *data)
           Get items from a database.
       int mdb_put (MDB_txn *txn, MDB_dbi dbi, MDB_val *key, MDB_val *data, unsigned int flags)
           Store items into a database.
       int mdb_del (MDB_txn *txn, MDB_dbi dbi, MDB_val *key, MDB_val *data)
           Delete items from a database.
       int mdb_cursor_open (MDB_txn *txn, MDB_dbi dbi, MDB_cursor **cursor)
           Create a cursor handle.
       void mdb_cursor_close (MDB_cursor *cursor)
           Close a cursor handle.
       int mdb_cursor_renew (MDB_txn *txn, MDB_cursor *cursor)
           Renew a cursor handle.
       MDB_txn * mdb_cursor_txn (MDB_cursor *cursor)
           Return the cursor's transaction handle.
       MDB_dbi mdb_cursor_dbi (MDB_cursor *cursor)
           Return the cursor's database handle.
       int mdb_cursor_get (MDB_cursor *cursor, MDB_val *key, MDB_val *data, MDB_cursor_op op)
           Retrieve by cursor.
       int mdb_cursor_put (MDB_cursor *cursor, MDB_val *key, MDB_val *data, unsigned int flags)
           Store by cursor.
       int mdb_cursor_del (MDB_cursor *cursor, unsigned int flags)
           Delete current key/data pair.
       int mdb_cursor_count (MDB_cursor *cursor, size_t *countp)
           Return count of duplicates for current key.
       int mdb_cmp (MDB_txn *txn, MDB_dbi dbi, const MDB_val *a, const MDB_val *b)
           Compare two data items according to a particular database.
       int mdb_dcmp (MDB_txn *txn, MDB_dbi dbi, const MDB_val *a, const MDB_val *b)
           Compare two data items according to a particular database.
       int mdb_reader_list (MDB_env *env, MDB_msg_func *func, void *ctx)
           Dump the entries in the reader lock table.
       int mdb_reader_check (MDB_env *env, int *dead)
           Check for stale entries in the reader lock table.

Detailed Description

       Lightning memory-mapped database library.

Typedef Documentation

   typedef mode_t mdb_mode_t
       Unix permissions for creating files, or dummy definition for Windows

   typedef int mdb_filehandle_t
       An abstraction for a file handle. On POSIX systems file handles are small integers. On
       Windows they're opaque pointers.

Author

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