zmq_connect(3)

SYNOPSIS

int zmq_connect (void *socket, const char *endpoint);

DESCRIPTION

The zmq_connect() function shall connect the socket referenced by the +socket argument to the endpoint specified by the endpoint argument.

The endpoint argument is a string consisting of two parts as follows: +transport://address. The transport part specifies the underlying +transport protocol to use. The meaning of the address part is specific to +the underlying transport protocol selected.

The following transports are defined:

+inproc +: +
+local in-process (inter-thread) communication transport, see zmq_inproc(7) +
+
+ipc +: +
+local inter-process communication transport, see zmq_ipc(7) +
+
+tcp +: +
+unicast transport using TCP, see zmq_tcp(7) +
+
+pgm, epgm +: +
+reliable multicast transport using PGM, see zmq_pgm(7) +
+

With the exception of ZMQ_PAIR sockets, a single socket may be connected to +multiple endpoints using zmq_connect(), while simultaneously accepting +incoming connections from multiple endpoints bound to the socket using +zmq_bind(). Refer to zmq_socket(3) for a description of the exact +semantics involved when connecting or binding a socket to multiple endpoints.

+ + + +

Note

The connection will not be performed immediately but as needed by ØMQ. +Thus a successful invocation of zmq_connect() does not indicate that a +physical connection was or can actually be established.

RETURN VALUE

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

ERRORS

+EPROTONOSUPPORT +: +
+The requested transport protocol is not supported. +
+
+ENOCOMPATPROTO +: +
+The requested transport protocol is not compatible with the socket type. +
+
+ETERM +: +
+The ØMQ context associated with the specified socket was terminated. +
+
+EFAULT +: +
+The provided socket was not valid (NULL). +
+
+EMTHREAD +: +
+No I/O thread is available to accomplish the task. +
+

EXAMPLE

Connecting a subscriber socket to an in-process and a TCP transport

/* Create a ZMQ_SUB socket */
+void *socket = zmq_socket (context, ZMQ_SUB);
+assert (socket);
+/* Connect it to an in-process transport with the address 'my_publisher' */
+int rc = zmq_connect (socket, "inproc://my_publisher");
+assert (rc == 0);
+/* Connect it to the host server001, port 5555 using a TCP transport */
+rc = zmq_connect (socket, "tcp://server001:5555");
+assert (rc == 0);

AUTHORS

This ØMQ manual page was written by Martin Sustrik <sustrik@250bpm.com> and +Martin Lucina <mato@kotelna.sk>.

+zmq_connect(3) Manual Page +