1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
|
zmq_connect(3)
==============
NAME
----
zmq_connect - create outgoing connection from socket
SYNOPSIS
--------
*int zmq_connect (void '*socket', const char '*endpoint');*
DESCRIPTION
-----------
The _zmq_connect()_ function connects the 'socket' to an 'endpoint' and then
accepts incoming connections on that endpoint.
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.
0MQ provides the the following transports:
'tcp':: unicast transport using TCP, see linkzmq:zmq_tcp[7]
'ipc':: local inter-process communication transport, see linkzmq:zmq_ipc[7]
'inproc':: local in-process (inter-thread) communication transport, see linkzmq:zmq_inproc[7]
'pgm', 'epgm':: reliable multicast transport using PGM, see linkzmq:zmq_pgm[7]
Every 0MQ socket type except 'ZMQ_PAIR' supports one-to-many and many-to-one
semantics. The precise semantics depend on the socket type and are defined in
linkzmq:zmq_socket[3].
NOTE: for most transports and socket types the connection is not performed
immediately but as needed by 0MQ. Thus a successful call to _zmq_connect()_
does not mean that the connection was or could actually be established.
Because of this, for most transports and socket types the order in which
a 'server' socket is bound and a 'client' socket is connected to it does not
matter. The first exception is when using the inproc:// transport: you must
call _zmq_bind()_ before calling _zmq_connect()_. The second exception are
_ZMQ_PAIR_ sockets, which do not automatically reconnect to endpoints.
NOTE: following a _zmq_connect()_, the socket enters its normal 'ready' state.
By contrast, following a _zmq_bind()_ alone, the socket enters a 'mute' state
in which the socket blocks or drops messages according to the socket type, as
defined in linkzmq:zmq_socket[3].
RETURN VALUE
------------
The _zmq_connect()_ function returns zero if successful. Otherwise it returns
`-1` and sets 'errno' to one of the values defined below.
ERRORS
------
*EINVAL*::
The endpoint supplied is invalid.
*EPROTONOSUPPORT*::
The requested 'transport' protocol is not supported.
*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.
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);
----
SEE ALSO
--------
linkzmq:zmq_bind[3]
linkzmq:zmq_socket[3]
linkzmq:zmq[7]
AUTHORS
-------
This 0MQ manual page was written by Pieter Hintjens <ph@imatix.com>,
Martin Sustrik <sustrik@250bpm.com> and Martin Lucina <mato@kotelna.sk>.
|
