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+= nng_aio_cancel(3)
+:doctype: manpage
+:manmanual: nng
+:mansource: nng
+:manvolnum: 3
+:copyright: Copyright 2018 mailto:info@staysail.tech[Staysail Systems, Inc.] + \
+            Copyright 2018 mailto:info@capitar.com[Capitar IT Group BV] + \
+            {blank} + \
+            This document is supplied under the terms of the \
+            https://opensource.org/licenses/MIT[MIT License].
+
+== NAME
+
+nng_aio_cancel - cancel asynchronous I/O operation
+
+== SYNOPSIS
+
+[source, c]
+-----------
+#include <nng/nng.h>
+
+void nng_aio_cancel(nng_aio *aio);
+-----------
+
+
+== DESCRIPTION
+
+The `nng_aio_cancel()` function aborts an operation previously started
+with the handle _aio_.  If the operation is aborted, then the callback
+for the handle will be called, and the function
+<<nng_aio_result#,nng_aio_result(3)>> will return the error `NNG_ECANCELED`.
+
+This function does not wait for the operation to be fully aborted, but
+returns immediately.
+
+If no operation is currently in progress (either because it has already
+finished, or no operation has been started yet), then this function
+has no effect.
+
+NOTE: This function is the same as calling <<nng_aio_abort#,nng_aio_abort()>>
+with the error `NNG_ECANCELED`.
+
+== RETURN VALUES
+
+None.
+
+== ERRORS
+
+None.
+
+== SEE ALSO
+
+<<nng_aio_abort#,nng_aio_abort(3)>>,
+<<nng_aio_alloc#,nng_aio_alloc(3)>>,
+<<nng_aio_result#,nng_aio_result(3)>>,
+<<nng#,nng(7)>>
+
+== COPYRIGHT
+
+{copyright}