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+= nng_dialer_start_aio(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_dialer_start_aio - start dialer with an asynchronous I/O handle
+
+== SYNOPSIS
+
+[source, c]
+----
+#include <nng/nng.h>
+
+int nng_dialer_start_aio(nng_dialer d, int flags, nng_aio *aiop);
+----
+
+== DESCRIPTION
+
+The `nng_dialer_start_aio()` function starts the dialer _d_ using the
+explicit asynchronous I/O operation handle _aiop_.
+
+This causes the dialer to asynchronously start connecting to the address with
+which it was created.
+
+When a connection is established, it results in a pipe being created,
+which will be attached to the dialer's socket.
+
+This function must be called with `NNG_FLAG_NONBLOCK` set in _flags_ to
+indicate that the connection attempt should be made asynchronously. Failing to
+do so will return `NNG_EINVAL`.
+
+When the dialer finishes dialing, it invokes
+xref:nng_aio_finish.3.adoc[`nng_aio_finish()`] with the dialing result. Only
+the first dialing result is communicated this way.
+
+Once a dialer has started, it is generally not possible to change
+its configuration.
+
+== RETURN VALUES
+
+None. (The operation completes asynchronously.)
+
+== ERRORS
+
+[horizontal]
+`NNG_EADDRINVAL`:: An invalid _url_ was specified.
+`NNG_ECLOSED`:: The socket _s_ is not open.
+`NNG_ECONNREFUSED`:: The remote peer refused the connection.
+`NNG_ECONNRESET`:: The remote peer reset the connection.
+`NNG_EINVAL`:: An invalid set of _flags_ was specified.
+`NNG_ENOENT`:: The dialer handle is invalid.
+`NNG_ENOMEM`:: Insufficient memory is available.
+`NNG_EPEERAUTH`:: Authentication or authorization failure.
+`NNG_EPROTO`:: A protocol error occurred.
+`NNG_ESTATE`:: The dialer _d_ is already started.
+`NNG_EUNREACHABLE`:: The remote address is not reachable.
+
+== SEE ALSO
+
+[.text-left]
+xref:nng_aio_result.3.adoc[nng_aio_result(3)]
+xref:nng_dial.3.adoc[nng_dial(3)],
+xref:nng_dialer_create.3.adoc[nng_dialer_create(3)]
+xref:nng_dialer_start.3.adoc[nng_dialer_start(3)]
+xref:nng_strerror.3.adoc[nng_strerror(3)],
+xref:nng_dialer.5.adoc[nng_dialer(5)],
+xref:nng.7.adoc[nng(7)]