= nng_stream_listener_alloc(3str)
//
// Copyright 2019 Staysail Systems, Inc. <info@staysail.tech>
// Copyright 2018 Capitar IT Group BV <info@capitar.com>
// Copyright 2019 Devolutions <info@devolutions.net>
//
// 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_stream_listener_alloc - allocate byte stream listener

== SYNOPSIS

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

int nng_stream_listener_alloc(nng_stream_listener **lp, const char *addr);

int nng_stream_listener_alloc_url(nng_stream_listener **lp, const nng_url *url);
----

== DESCRIPTION

These functions allocates a listener for byte streams.
Listeners create
xref:nng_stream.5.adoc[`nng_stream`] objects by accepting incoming
connections, via the
xref:nng_stream_listener_accept.3str.adoc[`nng_stream_listener_accept()`]
function.

The first form, `nng_stream_listener_alloc()`, connects to the address
specified by _addr_, which should be a string representing a URL.

The second form, `nng_stream_listener_alloc_url()`, takes a pre-parsed
or pre-constructed
xref:nng_url.5.adoc[`nng_url`] object to determine the remote address.

These functions may support different URL schemes, such as
`ipc://`, `tcp://`, `tls+tcp://`, or `ws://`.

Both forms store the listener in the location referenced by _lp_.

== RETURN VALUES

These functions return 0 on success, and non-zero otherwise.

== ERRORS

[horizontal]
`NNG_ENOMEM`:: Insufficient free memory exists.
`NNG_ENOTSUP`:: The URL scheme is not supported by the implementation.
`NNG_EADDRINVAL`:: The URL requested is invalid.

== SEE ALSO

[.text-left]
xref:nng_strerror.3.adoc[nng_strerror(3)],
xref:nng_stream_listener_accept.3str.adoc[nng_stream_listener_accept(3str)]
xref:nng_stream_listener_close.3str.adoc[nng_stream_listener_close(3str)]
xref:nng_stream_listener_free.3str.adoc[nng_stream_listener_free(3str)]
xref:nng_stream_listener_get.3str.adoc[nng_stream_listener_get(3str)]
xref:nng_stream_listener_listen.3str.adoc[nng_stream_listener_listen(3str)]
xref:nng_stream_listener_set.3str.adoc[nng_stream_listener_set(3str)]
xref:nng_stream_listener.5.adoc[nng_stream_listener(5)]
