= zmq_msg_set_routing_id(3)


== NAME

zmq_msg_set_routing_id - set routing ID property on message


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


== DESCRIPTION
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.


== RETURN VALUE
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.


== ERRORS
*EINVAL*::
The provided 'routing_id' is zero.


== SEE ALSO
* xref:zmq_msg_routing_id.adoc[zmq_msg_routing_id]
* xref:zmq.adoc[zmq]


== AUTHORS
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