rc= binary_incr_decr(ptr, PROTOCOL_BINARY_CMD_DECREMENT,
master_key, master_key_length, key, key_length,
(uint64_t)offset, 0, MEMCACHED_EXPIRATION_NOT_ADD,
value);
rc= binary_incr_decr(ptr, PROTOCOL_BINARY_CMD_DECREMENT,
master_key, master_key_length, key, key_length,
(uint64_t)offset, 0, MEMCACHED_EXPIRATION_NOT_ADD,
value);