NAME
mdb - OpenLDAP Lightning Memory-Mapped Database Manager.
SYNOPSIS
Modules
Version Macros
Environment Flags
Database Flags
Write Flags
Data Structures
struct MDB_val
Generic structure used for passing keys and data in and out
of the database.
Typedefs
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.
Detailed Description
OpenLDAP Lightning Memory-Mapped Database Manager.
Data Structure Documentation
struct MDB_val
Generic structure used for passing keys and data in and out of the database.
Values returned from the database are valid only until a subsequent update operation, or the end of the transaction. Do not modify or free them, they commonly point into the database itself.
Key sizes must be between 1 and mdb_env_get_maxkeysize() inclusive. The same applies to data sizes in databases with the MDB_DUPSORT flag. Other data items can in theory be from 0 to 0xffffffff bytes long.
Data Fields
size_t
mv_size
void * mv_data
Typedef Documentation
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. The newptr
gives the item’s desired address in the memory map,
and oldptr gives its previous address. The
item’s actual data resides at the address in
item. This callback is expected to walk through the
fields of the record in item and modify any values
based at the oldptr address to be relative to the
newptr address.
Parameters
item The item that is to
be relocated.
oldptr The previous address.
newptr The new address to relocate to.
relctx An application-provided context, set by
mdb_set_relctx().
Todo
This feature is currently unimplemented.
Author
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