2018-08-18 10:17:05 -04:00
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.\" **************************************************************************
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.\" * _ _ ____ _
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.\" * Project ___| | | | _ \| |
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.\" * / __| | | | |_) | |
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.\" * | (__| |_| | _ <| |___
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.\" * \___|\___/|_| \_\_____|
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.\" *
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.\" * Copyright (C) 1998 - 2018, Daniel Stenberg, <daniel@haxx.se>, et al.
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.\" *
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.\" * This software is licensed as described in the file COPYING, which
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.\" * you should have received as part of this distribution. The terms
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2020-11-04 08:02:01 -05:00
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.\" * are also available at https://curl.se/docs/copyright.html.
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2018-08-18 10:17:05 -04:00
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.\" *
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.\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell
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.\" * copies of the Software, and permit persons to whom the Software is
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.\" * furnished to do so, under the terms of the COPYING file.
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.\" *
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.\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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.\" * KIND, either express or implied.
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.\" *
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.\" **************************************************************************
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.\"
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.TH CURLOPT_UPLOAD_BUFFERSIZE 3 "18 Aug 2018" "libcurl 7.62.0" "curl_easy_setopt options"
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.SH NAME
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CURLOPT_UPLOAD_BUFFERSIZE \- set preferred upload buffer size
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.SH SYNOPSIS
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#include <curl/curl.h>
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CURLcode curl_easy_setopt(CURL *handle, CURLOPT_UPLOAD_BUFFERSIZE, long size);
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.SH DESCRIPTION
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Pass a long specifying your preferred \fIsize\fP (in bytes) for the upload
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buffer in libcurl. It makes libcurl uses a larger buffer that gets passed to
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the next layer in the stack to get sent off. In some setups and for some
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protocols, there's a huge performance benefit of having a larger upload
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buffer.
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This is just treated as a request, not an order. You cannot be guaranteed to
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actually get the given size.
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The upload buffer size is by default 64 kilobytes. The maximum buffer size
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allowed to be set is 2 megabytes. The minimum buffer size allowed to be set is
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16 kilobytes.
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Since curl 7.61.1 the upload buffer is allocated on-demand - so if the handle
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isn't used for upload, this buffer will not be allocated at all.
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.SH DEFAULT
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64 kB
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.SH PROTOCOLS
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All
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.SH EXAMPLE
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.nf
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CURL *curl = curl_easy_init();
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if(curl) {
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curl_easy_setopt(curl, CURLOPT_URL, "sftp://example.com/foo.bin");
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/* ask libcurl to allocate a larger upload buffer */
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curl_easy_setopt(curl, CURLOPT_UPLOAD_BUFFERSIZE, 120000L);
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ret = curl_easy_perform(curl);
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curl_easy_cleanup(curl);
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}
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.fi
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.SH AVAILABILITY
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Added in 7.62.0.
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.SH RETURN VALUE
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Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
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.SH "SEE ALSO"
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.BR CURLOPT_BUFFERSIZE "(3), " CURLOPT_READFUNCTION "(3), "
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