= nng_listener_start(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_start - start 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_start(nng_listener l, int flags);
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----
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== DESCRIPTION
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The `nng_listener_start()` function starts the listener _l_.
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This causes the listener to bind to the address it was created with,
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and to start accepting connections from remote
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dialers.
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Each new connection results in an xref:nng_pipe.5.adoc[`nng_pipe`] object,
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which will be attached to the listener's socket.
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The _flags_ argument is ignored, but reserved for future use.
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Once a listener has started, it is generally not possible to change
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its configuration.
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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_ECLOSED`:: Parameter _l_ does not refer to an open listener.
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`NNG_ESTATE`:: The listener _l_ is already started.
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== SEE ALSO
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[.text-left]
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xref:nng_listen.3.adoc[nng_listen(3)],
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xref:nng_listener_create.3.adoc[nng_listener_create(3)]
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xref:nng_listener.5.adoc[nng_listener(5)],
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xref:nng_strerror.3.adoc[nng_strerror(3)],
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xref:nng.7.adoc[nng(7)]
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