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+= nng_aio(5)
+//
+// 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_aio - asynchronous I/O handle
+
+== SYNOPSIS
+
+[source, c]
+----
+#include <nng/nng.h>
+
+typedef struct nng_aio nng_aio;
+----
+
+== DESCRIPTION
+
+An `nng_aio`(((aio))) is an opaque structure used in conjuction with
+((asynchronous I/O)) operations.
+Every asynchronous operation uses one of these structures, each of which
+can only be used with a single operation at a time.
+
+Asynchronous operations are performed without blocking calling application
+threads.
+Instead the application registers a "`callback`" function to be executed
+when the operation is complete (whether successfully or not).
+This callback will be executed exactly once.
+
+The asynchronous I/O framework in _nng_ also supports cancellation of
+operations that are already in progress
+(see <<nng_aio_cancel.3#,`nng_aio_cancel()`>>), as well setting a maximum
+timeout for them to complete within
+(see <<nng_aio_set_timeout.3#,`nng_aio_set_timeout()`>>).
+
+It is also possible to initiate an asynchronous operation, and wait for it to
+complete using <<nng_aio_wait.3#,`nng_aio_wait()`>>.
+
+These structures are created using the <<nng_aio_alloc.3#,`nng_aio_alloc()`>>,
+and destroyed using <<nng_aio_free.3#,`nng_aio_free()`>>.
+
+== SEE ALSO
+
+<<nng_aio_abort.3#,nng_aio_abort(3)>>,
+<<nng_aio_alloc.3#,nng_aio_alloc(3)>>,
+<<nng_aio_cancel.3#,nng_aio_cancel(3)>>,
+<<nng_aio_count.3#,nng_aio_count(3)>>,
+<<nng_aio_free.3#,nng_aio_free(3)>>,
+<<nng_aio_get_input.3#,nng_aio_get_input(3)>>,
+<<nng_aio_get_msg.3#,nng_aio_get_msg(3)>>,
+<<nng_aio_get_output.3#,nng_aio_get_output(3)>>,
+<<nng_aio_result.3#,nng_aio_result(3)>>,
+<<nng_aio_set_input.3#,nng_aio_set_input(3)>>,
+<<nng_aio_set_iov.3#,nng_aio_set_iov(3)>>,
+<<nng_aio_set_msg.3#,nng_aio_set_msg(3)>>,
+<<nng_aio_set_timeout.3#,nng_aio_set_timeout(3)>>,
+<<nng_aio_stop.3#,nng_aio_stop(3)>>,
+<<nng_aio_wait.3#,nng_aio_wait(3)>>,
+<<nng_strerror.3#,nng_strerror(3)>>,
+<<nng_aio.5#,nng_aio(5)>>,
+<<nng.7#,nng(7)>>