ssize_t memcached_io_writev(memcached_server_write_instance_st ptr,
const struct libmemcached_io_vector_st *vector,
size_t number_of, bool with_flush)
ssize_t memcached_io_writev(memcached_server_write_instance_st ptr,
const struct libmemcached_io_vector_st *vector,
size_t number_of, bool with_flush)