pub extern "C" fn xCheckpoint( wal: *mut Wal, db: *mut c_void, emode: i32, busy_handler: extern "C" fn(busy_param: *mut c_void) -> i32, busy_arg: *const c_void, sync_flags: i32, n_buf: i32, z_buf: *mut u8, frames_in_wal: *mut i32, backfilled_frames: *mut i32) -> i32