NAME¶

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

SYNOPSIS¶

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

DESCRIPTION¶

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

ipc

inproc

ws

wss

RETURN VALUE¶

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.

ERRORS¶

EINVAL

EPROTONOSUPPORT

ENOCOMPATPROTO

ETERM

ENOTSOCK

EMTHREAD

ENOTSUP

EFAULT

EXAMPLE¶

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);

SEE ALSO¶

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

AUTHORS¶

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