zmq_msg_set_routing_id - Man Page

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.

EINVAL

The provided routing_id is zero.

zmq_msg_routing_id(3) zmq(7)

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zmq_msg_routing_id(3), zmq_socket(3).