96 lines
3.7 KiB
Text
96 lines
3.7 KiB
Text
= nng_http_conn_write_all(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_write_all - write all to 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_write_all(nng_http_conn *conn, nng_aio *aio);
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----
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== DESCRIPTION
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The `nng_http_conn_write_all()` function starts an asynchronous write to 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_, and the
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final result may be obtained via 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 only when the entire amount of data
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requested has been written, or an error has occurred.
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If the operation completes successfully, then the entire requested data has
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been written.
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It is still possible for a partial write to complete in the event of an error.
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The actual number of bytes written can be determined with
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xref:nng_aio_count.3.adoc[`nng_aio_count()`].
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TIP: The main purpose for this function is to facilitate writing HTTP
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body content.
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TIP: Usually an HTTP request or response will have been written immediately
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prior to this with xref:nng_http_conn_write_req.3http.adoc[`http_conn_write_req()`] or
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xref:nng_http_conn_write_res.3http.adoc[`http_conn_write_res()`].
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In that case the request or response should have also contained
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an `Content-Length` header, and possibly a `Content-Type` header.
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TIP: An easier solution to sending HTTP content data, is to include the
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content with the request or reply using a function like
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xref:nng_http_req_copy_data.3http.adoc[`nng_http_req_copy_data()`].
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In that case, the body data will be written automatically by the
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xref:nng_http_conn_write_req.3http.adoc[`http_conn_write_req()`] or
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xref:nng_http_conn_write_req.3http.adoc[`http_conn_write_res()`] 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_client_connect.3http.adoc[nng_http_client_connect(3http)],
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xref:nng_http_conn_write.3http.adoc[nng_http_conn_write(3http)],
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xref:nng_http_conn_write_req.3http.adoc[http_conn_write_req(3http)],
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xref:nng_http_conn_write_res.3http.adoc[http_conn_write_res(3http)],
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xref:nng_http_req_copy_data.3http.adoc[nng_http_req_copy_data(3http)],
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xref:nng_http_req_set_data.3http.adoc[nng_http_req_set_data(3http)],
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xref:nng_http_res_copy_data.3http.adoc[nng_http_res_copy_data(3http)],
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xref:nng_http_res_set_data.3http.adoc[nng_http_res_set_data(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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