Function libsqlite3_sys::sqlite3_wal_hook

pub unsafe extern fn sqlite3_wal_hook(arg1: *mut sqlite3,
                                      arg2: Option<unsafe extern fn(arg1: *mut c_void, arg2: *mut sqlite3, arg3: *const c_char, arg4: c_int) -> c_int>,
                                      arg3: *mut c_void)
                                      -> *mut c_void