zmq_msg_set_routing_id(3)

zmq_msg_set_routing_id - set routing ID property on message

int zmq_msg_set_routing_id (zmq_msg_t '*message', uint32_t 'routing_id');

The zmq_msg_set_routing_id() function sets the 'routing_id' specified, on the the message pointed to by the 'message' argument. The 'routing_id' must be greater than zero. To get a valid routing ID, you must receive a message from a 'ZMQ_SERVER' socket, and use the libzmq:zmq_msg_routing_id method. Routing IDs are transient.

The zmq_msg_set_routing_id() function shall return zero if successful. Otherwise it shall return -1 and set 'errno' to one of the values defined below.

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