bool memcached_io_write(memcached_server_write_instance_st ptr);
ssize_t memcached_io_write(memcached_server_write_instance_st ptr,
const void *buffer, size_t length, bool with_flush);
ssize_t memcached_io_writev(memcached_server_write_instance_st ptr,
bool memcached_io_write(memcached_server_write_instance_st ptr);
ssize_t memcached_io_write(memcached_server_write_instance_st ptr,
const void *buffer, size_t length, bool with_flush);
ssize_t memcached_io_writev(memcached_server_write_instance_st ptr,