1NN_DEVICE(3) nanomsg 1.1.5 NN_DEVICE(3)
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6 nn_device - start a device
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9 #include <nanomsg/nn.h>
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11 int nn_device (int s1, int s2);
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14 Starts a device to forward messages between two sockets. If both
15 sockets are valid, nn_device function loops and sends any messages
16 received from s1 to s2 and vice versa. If only one socket is valid and
17 the other is negative, nn_device works in a "loopback" mode — it loops
18 and sends any messages received from the socket back to itself.
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20 To break the loop and make nn_device function exit use the nn_term(3)
21 function.
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24 The function loops until it hits an error. In such a case it returns -1
25 and sets errno to one of the values defined below.
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28 EBADF
29 One of the provided sockets is invalid.
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31 EINVAL
32 Either one of the socket is not an AF_SP_RAW socket; or the two
33 sockets don’t belong to the same protocol; or the directionality of
34 the sockets doesn’t fit (e.g. attempt to join two SINK sockets to
35 form a device).
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37 EINTR
38 The operation was interrupted by delivery of a signal.
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40 ETERM
41 The library is terminating.
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44 int s1 = nn_socket (AF_SP_RAW, NN_REQ);
45 nn_bind (s1, "tcp://127.0.0.1:5555");
46 int s2 = nn_socket (AF_SP_RAW, NN_REP);
47 nn_bind (s2, "tcp://127.0.0.1:5556");
48 nn_device (s1, s2);
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51 nn_socket(3) nn_term(3) nanomsg(7)
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54 Martin Sustrik <sustrik@250bpm.com>
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58 2023-01-19 NN_DEVICE(3)