Manpages - zmq_connect_peer.3

zmq_connect_peer - create outgoing connection from socket and return the connection routing id in thread-safe and atomic way.

uint32_t zmq_connect_peer (void */*socket/, const char *endpoint);*

The zmq_connect_peer() function connects a ZMQ_PEER socket to an endpoint and then returns the endpoint routing_id.

The endpoint is a string consisting of a transport:// followed by an address. The transport specifies the underlying protocol to use. The address specifies the transport-specific address to connect to.

The function is supported only on the ZMQ_PEER socket type and would return 0 with errno set to ENOTSUP otherwise.

The zmq_connect_peer() support the following transports:

tcp

unicast transport using TCP, see *zmq_tcp*(7)

ipc

local inter-process communication transport, see *zmq_ipc*(7)

inproc

local in-process (inter-thread) communication transport, see *zmq_inproc*(7)

ws

unicast transport using WebSockets, see *zmq_ws*(7)

wss

unicast transport using WebSockets over TLS, see *zmq_wss*(7)

The zmq_connect_peer() function returns the peer routing_id if successful. Otherwise it returns 0 and sets errno to one of the values defined below.

EINVAL

The endpoint supplied is invalid.

EPROTONOSUPPORT

The requested transport protocol is not supported with ZMQ_PEER.

ENOCOMPATPROTO

The requested transport protocol is not compatible with the socket type.

ETERM

The 0MQ context associated with the specified socket was terminated.

ENOTSOCK

The provided socket was invalid.

EMTHREAD

No I/O thread is available to accomplish the task.

ENOTSUP

The socket is not of type ZMQ_PEER.

EFAULT

The ZMQ_IMMEDIATE option is set on the socket.

Connecting a peer socket to a TCP transport and sending a message.

    /* Create a ZMQ_SUB socket */
    void *socket = zmq_socket (context, ZMQ_PEER);
    assert (socket);
    /* Connect it to the host server001, port 5555 using a TCP transport */
    uint32_t routing_id = zmq_connect (socket, "tcp://server001:5555");
    assert (routing_id == 0);
    /* Sending a message to the peer  */
    zmq_msg_t msg;
    int rc = zmq_msg_init_data (&msg, "HELLO", 5, NULL, NULL);
    assert (rc == 0);
    rc = zmq_msg_set_routing_id (&msg, routing_id);
    assert (rc == 0);
    rc = zmq_msg_send (&msg, socket, 0);
    assert (rc == 5);
    rc = zmq_msg_close (&msg);
    assert (rc == 0);

*zmq_connect*(3) *zmq_bind*(3) *zmq_socket*(3) *zmq*(7)

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