= nng_sub_open(3)
//
// 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

nng_sub_open - create sub socket

== SYNOPSIS

[source,c]
----
#include <nng/nng.h>
#include <nng/protocol/pubsub0/sub.h>

int nng_sub0_open(nng_socket *s);
----

== DESCRIPTION

The `nng_sub0_open()` function creates a <<nng_sub.7#,_sub_>> version 0
<<nng_socket.5#,socket>> and returns it at the location pointed to by _s_.

== RETURN VALUES

This function returns 0 on success, and non-zero otherwise.

== ERRORS

`NNG_ENOMEM`:: Insufficient memory is available.
`NNG_ENOTSUP`:: The protocol is not supported.

== SEE ALSO

<<nng_socket.5#,nng_socket(5)>>,
<<nng_pub.7#,nng_pub(7)>>,
<<nng_sub.7#,nng_sub(7)>>,
<<nng.7#,nng(7)>>