62 lines
1.7 KiB
Text
62 lines
1.7 KiB
Text
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= nng_aio_count(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_aio_count - return number of bytes transferred
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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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size_t nng_aio_count(nng_aio *aio);
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----
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== DESCRIPTION
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The `nng_aio_count()` returns the number of bytes transferred by the
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asynchronous operation associated with the handle _aio_.
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Some asynchronous operations do not provide meaningful data for this
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function; for example operations that establish connections do not
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transfer user data (they may transfer protocol data though) -- in this case
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this function will generally return zero.
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This function is most useful when used with operations that make use of
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of a scatter/gather vector (set by xref:nng_aio_set_iov.3.adoc[`nng_aio_set_iov()`]).
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NOTE: The return value from this function is undefined if the operation
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has not completed yet.
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Either call this from the handle's completion callback,
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or after waiting for the operation to complete with
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xref:nng_aio_wait.3.adoc[`nng_aio_wait()`].
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== RETURN VALUES
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The number of bytes transferred by the operation.
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== ERRORS
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None.
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== SEE ALSO
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[.text-left]
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xref:nng_aio_alloc.3.adoc[nng_aio_alloc(3)],
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xref:nng_aio_result.3.adoc[nng_aio_result(3)],
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xref:nng_aio_set_iov.3.adoc[nng_aio_set_iov(3)],
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xref:nng_aio_wait.3.adoc[nng_aio_wait(3)],
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xref:nng_strerror.3.adoc[nng_strerror(3)],
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xref:nng_aio.5.adoc[nng_aio(5)],
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xref:nng.7.adoc[nng(7)]
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