= nng_listener_create(3)
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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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nng_listener_create - create listener
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== SYNOPSIS
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[source, c]
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----
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#include <nng/nng.h>
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int nng_listener_create(nng_listener *listenerp, nng_socket s, const char *url);
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----
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== DESCRIPTION
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The `nng_listener_create()` function creates a newly initialized
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xref:nng_listener.5.adoc[`nng_listener`] object, associated with socket _s_,
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and configured to listen at the address specified by _url_,
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and stores a pointer to at the location referenced by _listenerp_.
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Listeners are used to accept connections initiated by remote dialers.
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An incoming connection generally results in a pipe being created and attached
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to the socket _s_.
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Unlike dialers, listeners generally can create many pipes,
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which may be open concurrently.
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TIP: While it is convenient to think of listeners as servers, the
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relationship between the listener or dialer is orthogonal to any server or
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client status that might be associated with a given protocol.
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For example, a xref:nng_req.7.adoc[_req_] socket might have associated dialers,
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but might also have associated listeners.
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It may even have some of each at the same time!
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The listener is not started, but may be further configured with
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the xref:nng_listener_setopt.3.adoc[`nng_listener_setopt()`] family of
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functions.
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Once it is fully configured, the listener may be started using the
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xref:nng_listener_start.3.adoc[`nng_listener_start()`] function.
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TIP: If no specific configuration is required, consider using the
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simpler xref:nng_listen.3.adoc[`nng_listen()`] function instead.
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== RETURN VALUES
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This function returns 0 on success, and non-zero otherwise.
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== ERRORS
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[horizontal]
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`NNG_EADDRINVAL`:: An invalid _url_ was specified.
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`NNG_ECLOSED`:: The socket _s_ is not open.
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`NNG_ENOMEM`:: Insufficient memory is available.
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== SEE ALSO
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[.text-left]
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xref:nng_dialer_create.3.adoc[nng_dialer_create(3)]
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xref:nng_listen.3.adoc[nng_listen(3)],
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xref:nng_listener_close.3.adoc[nng_listener_close(3)],
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xref:nng_listener_getopt.3.adoc[nng_listener_getopt(3)],
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xref:nng_listener_setopt.3.adoc[nng_listener_setopt(3)],
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xref:nng_listener_start.3.adoc[nng_listener_start(3)],
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xref:nng_strerror.3.adoc[nng_strerror(3)],
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xref:nng_listener.5.adoc[nng_listener(5)],
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xref:nng.7.adoc[nng(7)]
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