Function svn_fs_txn_name 

pub unsafe extern "C" fn svn_fs_txn_name(
    name_p: *mut *const c_char,
    txn: *mut svn_fs_txn_t,
    pool: *mut apr_pool_t,
) -> *mut svn_error_t

Set @a *name_p to the name of the transaction @a txn, as a NULL-terminated string. Allocate the name in @a pool.