nn_connect(3)

1NN_CONNECT(3)                    nanomsg 1.1.5                   NN_CONNECT(3)
2
3
4

NAME

6       nn_connect - add a remote endpoint to the socket
7

SYNOPSIS

9       #include <nanomsg/nn.h>
10
11       int nn_connect (int s, const char *addr);
12

DESCRIPTION

14       Adds a remote endpoint to the socket s. The library would then try to
15       connect to the specified remote endpoint.
16
17       The addr argument consists of two parts as follows:
18       transport://address. The transport specifies the underlying transport
19       protocol to use. The meaning of the address part is specific to the
20       underlying transport protocol.
21
22       For the list of available transport protocols check the list on
23       nanomsg(7) manual page.
24
25       Maximum length of the addr parameter is specified by NN_SOCKADDR_MAX
26       defined in <nanomsg/nn.h> header file.
27
28       Note that nn_connect and nn_bind(3) may be called multiple times on the
29       same socket thus allowing the socket to communicate with multiple
30       heterogeneous endpoints.
31

NOTE

33       Unlike with traditional BSD sockets, this function operates
34       asynchronously, and returns to the caller before the operation is
35       complete. As a result, attempts to send data or receive data on the
36       socket may not succeed until the underlying transport actually
37       establishes the connection. Further, the connection may be lost,
38       without any notification to the caller. The library will attempt to
39       reconnect automatically in such an event.
40

RETURN VALUE

42       If the function succeeds positive endpoint ID is returned. Endpoint ID
43       can be later used to remove the endpoint from the socket via
44       nn_shutdown(3) function.
45
46       If the function fails negative value is returned and errno is set to to
47       one of the values defined below.
48

ERRORS

50       EBADF
51           The provided socket is invalid.
52
53       EMFILE
54           Maximum number of active endpoints was reached.
55
56       EINVAL
57           The syntax of the supplied address is invalid.
58
59       ENAMETOOLONG
60           The supplied address is too long.
61
62       EPROTONOSUPPORT
63           The requested transport protocol is not supported.
64
65       ENODEV
66           Address specifies a nonexistent interface.
67
68       ETERM
69           The library is terminating.
70

EXAMPLE

72           s = nn_socket (AF_SP, NN_PUB);
73           eid1 = nn_connect (s, "ipc:///tmp/test.ipc");
74           eid2 = nn_connect (s, "tcp://server001:5560");
75

AUTHORS

81       Martin Sustrik <sustrik@250bpm.com> Garrett D’Amore
82       <garrett@damore.org>
83
84
85
86                                  2020-01-29                     NN_CONNECT(3)