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+= nn_socket(3compat)
+//
+// Copyright 2018 Staysail Systems, Inc. <info@staysail.tech>
+// Copyright 2018 Capitar IT Group BV <info@capitar.com>
+//
+// This document is supplied under the terms of the MIT License, a
+// copy of which should be located in the distribution where this
+// file was obtained (LICENSE.txt).  A copy of the license may also be
+// found online at https://opensource.org/licenses/MIT.
+//
+
+== NAME
+
+nn_socket - create socket (compatible API)
+
+== SYNOPSIS
+
+[source,c]
+----
+#include <nanomsg/nn.h>
+
+int nn_socket(int af, int proto);
+----
+
+== DESCRIPTION
+
+The `nn_socket()` function creates socket using the address family _af_ and
+protocol _proto_ and returns it.
+
+NOTE: This function is provided for API
+xref:nng_compat.3compat.adoc[compatibility] with legacy _libnanomsg_.
+Consider using the relevant xref:libnng.3.adoc[modern API] instead.
+
+IMPORTANT: Mixing the compatibility API and the modern API is not supported
+on a given socket.
+
+NOTE: Some protocols, transports, and features are only available in the modern API.
+
+The address family _af_ can be one of two values:
+
+[horizontal]
+`AF_SP`:: Normal socket.
+`AF_SP_RAW`:: xref:nng.7.adoc#raw_mode[Raw mode] socket.
+
+The protocol indicates the protocol to be used when creating the socket.
+The following protocols are defined:
+
+[horizontal]
+`NN_PAIR`:: xref:nng_pair.7.adoc[Pair] protocol.
+`NN_PUB`:: xref:nng_pub.7.adoc[Publisher] protocol.
+`NN_SUB`:: xref:nng_sub.7.adoc[Subscriber] protocol.
+`NN_REQ`:: xref:nng_req.7.adoc[Requestor] protocol.
+`NN_REP`:: xref:nng_rep.7.adoc[Replier] protocol.
+`NN_PUSH`:: xref:nng_push.7.adoc[Push] protocol.
+`NN_PULL`:: xref:nng_pull.7.adoc[Pull] protocol.
+`NN_SURVEYOR`:: xref:nng_surveyor.7.adoc[Surveyor] protocol.
+`NN_RESPONDENT`:: xref:nng_respondent.7.adoc[Respondent] protocol.
+`NN_BUS`:: xref:nng_bus.7.adoc[Bus] protocol.
+
+== RETURN VALUES
+
+This function returns a valid socket number on success, and -1 on failure.
+
+== ERRORS
+
+[horizontal]
+`ENOMEM`:: Insufficient memory is available.
+`ENOTSUP`:: The protocol is not supported.
+`ETERM`:: The library is shutting down.
+
+== SEE ALSO
+
+[.text-left]
+xref:nng_socket.5.adoc[nng_socket(5)],
+xref:nn_close.3compat.adoc[nn_close(3compat)],
+xref:nn_errno.3compat.adoc[nn_errno(3compat)],
+xref:nng_compat.3compat.adoc[nng_compat(3compat)],
+xref:nng.7.adoc[nng(7)]