= nn_device(3compat)
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//
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// Copyright 2018 Staysail Systems, Inc. <info@staysail.tech>
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// Copyright 2018 Capitar IT Group BV <info@capitar.com>
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//
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// This document is supplied under the terms of the MIT License, a
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// copy of which should be located in the distribution where this
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// file was obtained (LICENSE.txt). A copy of the license may also be
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// found online at https://opensource.org/licenses/MIT.
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//
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== NAME
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nn_device - create forwarding device (compatible API)
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== SYNOPSIS
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[source,c]
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----
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#include <nanomsg/nn.h>
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int nn_device(int sock1, int sock2);
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----
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== DESCRIPTION
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The `nn_device()` function is used to create a forwarder, where messages
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received on one of the two sockets _sock1_ and _sock2_ are forwarded to
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the other.
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NOTE: This function is provided for API
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xref:nng_compat.3compat.adoc[compatibility] with legacy _libnanomsg_.
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Consider using the relevant xref:libnng.3.adoc[modern API] instead.
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The two sockets must be compatible, and must be
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xref:nng.7.adoc#raw_mode[raw mode]
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sockets.
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More detail about devices and how they can be used is available in the
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new style xref:nng_device.3.adoc[nng_device()] documentation.
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== RETURN VALUES
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This function blocks forever, and will return -1 only when
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one of the sockets is closed or an error occurs.
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== ERRORS
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[horizontal]
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`EBADF`:: One of the two sockets is invalid or not open, or has
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`EINVAL`:: The sockets are not compatible with each other, or not both raw.
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`ENOMEM`:: Insufficient memory is available.
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== SEE ALSO
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[.text-left]
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xref:nn_errno.3compat.adoc[nn_errno(3compat)],
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xref:nn_socket.3compat.adoc[nn_socket(3compat)],
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xref:nng_compat.3compat.adoc[nng_compat(3compat)],
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xref:nng.7.adoc[nng(7)]
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