Function mdb_set_relctx

pub unsafe extern "C" fn mdb_set_relctx(
    txn: *mut MDB_txn,
    dbi: MDB_dbi,
    ctx: *mut c_void,
) -> c_int

Set a context pointer for a #MDB_FIXEDMAP database’s relocation function.

See #mdb_set_relfunc and #MDB_rel_func for more details.

Arguments

• txn (direction in) - A transaction handle returned by #mdb_txn_begin()
• dbi (direction in) - A database handle returned by #mdb_dbi_open()
• ctx (direction in) - An arbitrary pointer for whatever the application needs. It will be passed to the callback function set by #mdb_set_relfunc as its relctx parameter whenever the callback is invoked.

Returns

A non-zero error value on failure and 0 on success. Some possible errors are:

• EINVAL - an invalid parameter was specified.