NAME

       zmq_msg_routing_id - return routing ID for message, if any

SYNOPSIS

       uint32_t zmq_msg_routing_id (zmq_msg_t *message);

DESCRIPTION

       The zmq_msg_routing_id() function returns the routing ID for the message, if any. The
       routing ID is set on all messages received from a ZMQ_SERVER socket. To send a message to
       a ZMQ_SERVER socket you must set the routing ID of a connected ZMQ_CLIENT peer. Routing
       IDs are transient.

RETURN VALUE

       The zmq_msg_routing_id() function shall return zero if there is no routing ID, otherwise
       it shall return an unsigned 32-bit integer greater than zero.

EXAMPLE

       Receiving a client message and routing ID.

           void *ctx = zmq_ctx_new ();
           assert (ctx);

           void *server = zmq_socket (ctx, ZMQ_SERVER);
           assert (server);
           int rc = zmq_bind (server, "tcp://127.0.0.1:8080");
           assert (rc == 0);

           zmq_msg_t message;
           rc = zmq_msg_init (&message);
           assert (rc == 0);

           //  Receive a message from socket
           rc = zmq_msg_recv (server, &message, 0);
           assert (rc != -1);
           uint32_t routing_id = zmq_msg_routing_id (&message);
           assert (routing_id);

SEE ALSO

       zmq_msg_set_routing_id(3)

AUTHORS

       This page was written by the 0MQ community. To make a change please read the 0MQ
       Contribution Policy at http://www.zeromq.org/docs:contributing.