77 lines
2.5 KiB
Text
77 lines
2.5 KiB
Text
= nng_http_conn_read(3http)
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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_http_conn_read - read from HTTP connection
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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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#include <nng/supplemental/http/http.h>
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void nng_http_conn_read(nng_http_conn *conn, nng_aio *aio);
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----
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== DESCRIPTION
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The `nng_http_conn_read()` function starts an asynchronous read from the
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HTTP connection _conn_, into the scatter/gather vector located in the
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asynchronous I/O structure _aio_.
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NOTE: The xref:nng_aio_set_iov.3.adoc[`nng_aio_set_iov()`] function must have been
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called first, to set the scatter/gather vector for _aio_.
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This function returns immediately, with no return value.
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Completion of the operation is signaled via the _aio_,
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and the final result may be obtained via
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xref:nng_aio_result.3.adoc[`nng_aio_result()`].
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That result will either be zero or an error code.
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The I/O operation completes as soon as at least one byte has been
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read, or an error has occurred.
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Therefore, the number of bytes read may be less than requested.
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The actual number of bytes read can be determined with
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xref:nng_aio_count.3.adoc[`nng_aio_count()`].
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TIP: This function is intended to facilitate uses cases that involve changing
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the protocol from HTTP, such as WebSocket.
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Most applications will never need to use this function.
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== RETURN VALUES
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None.
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== ERRORS
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[horizontal]
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`NNG_ECANCELED`:: The operation was canceled.
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`NNG_ECLOSED`:: The connection was closed.
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`NNG_ECONNRESET`:: The peer closed the connection.
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`NNG_EINVAL`:: The _aio_ does not contain a valid scatter/gather vector.
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`NNG_ENOMEM`:: Insufficient free memory to perform the operation.
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`NNG_ENOTSUP`:: HTTP operations are not supported.
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`NNG_ETIMEDOUT`:: Timeout waiting for data from the connection.
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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_count.3.adoc[nng_aio_count(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_http_handler_alloc.3http.adoc[nng_http_handler_alloc(3http)],
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xref:nng_http_client_connect.3http.adoc[nng_http_client_connect(3http)],
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xref:nng_http_conn_read_all.3http.adoc[nng_http_conn_read_all(3http)],
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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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