#include <zmq.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>

#define S(x) #x
#define S_(x) S(x)
#define LINE S_(__LINE__)
#define req(x) do { if (!(x)) { perror(__FILE__ ":" LINE ": " #x); abort(); } } while (0)

int main()
{
  void *context = zmq_ctx_new();
  req(context);
  void *client = zmq_socket(context, ZMQ_REQ);
  req(client);
  req(0 == zmq_connect(client, "tcp://127.0.0.1:5555"));

  zmq_msg_t request;
  req(0 == zmq_msg_init_size(&request, 2));
  memcpy(zmq_msg_data(&request), "hi", 2);
  req(0 <= zmq_msg_send(&request, client, 0));
  req(0 == zmq_msg_close(&request));

  zmq_msg_t reply;
  zmq_msg_init(&reply);
  req(0 <= zmq_msg_recv(&reply, client, 0));
  write(1, zmq_msg_data(&reply), zmq_msg_size(&reply));
  write(1, "\n", 1);
  req(0 == zmq_msg_close(&reply));

  req(0 == zmq_close(client));
  req(0 == zmq_ctx_destroy(context));

  return 0;
}