= nn_socket(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_socket - create socket (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_socket(int af, int proto);
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----
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== DESCRIPTION
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The `nn_socket()` function creates socket using the address family _af_ and
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protocol _proto_ and returns it.
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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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IMPORTANT: Mixing the compatibility API and the modern API is not supported
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on a given socket.
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NOTE: Some protocols, transports, and features are only available in the modern API.
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The address family _af_ can be one of two values:
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[horizontal]
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`AF_SP`:: Normal socket.
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`AF_SP_RAW`:: xref:nng.7.adoc#raw_mode[Raw mode] socket.
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The protocol indicates the protocol to be used when creating the socket.
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The following protocols are defined:
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[horizontal]
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`NN_PAIR`:: xref:nng_pair.7.adoc[Pair] protocol.
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`NN_PUB`:: xref:nng_pub.7.adoc[Publisher] protocol.
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`NN_SUB`:: xref:nng_sub.7.adoc[Subscriber] protocol.
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`NN_REQ`:: xref:nng_req.7.adoc[Requestor] protocol.
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`NN_REP`:: xref:nng_rep.7.adoc[Replier] protocol.
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`NN_PUSH`:: xref:nng_push.7.adoc[Push] protocol.
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`NN_PULL`:: xref:nng_pull.7.adoc[Pull] protocol.
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`NN_SURVEYOR`:: xref:nng_surveyor.7.adoc[Surveyor] protocol.
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`NN_RESPONDENT`:: xref:nng_respondent.7.adoc[Respondent] protocol.
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`NN_BUS`:: xref:nng_bus.7.adoc[Bus] protocol.
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== RETURN VALUES
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This function returns a valid socket number on success, and -1 on failure.
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== ERRORS
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[horizontal]
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`ENOMEM`:: Insufficient memory is available.
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`ENOTSUP`:: The protocol is not supported.
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`ETERM`:: The library is shutting down.
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== SEE ALSO
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[.text-left]
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xref:nng_socket.5.adoc[nng_socket(5)],
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xref:nn_close.3compat.adoc[nn_close(3compat)],
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xref:nn_errno.3compat.adoc[nn_errno(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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