mirror of
https://github.com/moparisthebest/curl
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1763aceb0c
Previously this logic would cap the send to CURL_MAX_WRITE_SIZE bytes, but for the situations where a larger upload buffer has been set, this function can benefit from sending more bytes. With default size used, this does the same as before. Also changed the storage of the size to an 'unsigned int' as it is not allowed to be set larger than 2M. Also added cautions to the man pages about changing buffer sizes in run-time. Closes #7022
69 lines
2.6 KiB
Groff
69 lines
2.6 KiB
Groff
.\" **************************************************************************
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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 - 2017, 2021, 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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.\" * are also available at https://curl.se/docs/copyright.html.
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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_BUFFERSIZE 3 "17 Jun 2014" "libcurl 7.37.0" "curl_easy_setopt options"
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.SH NAME
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CURLOPT_BUFFERSIZE \- set preferred receive 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_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 receive
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buffer in libcurl. The main point of this would be that the write callback
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gets called more often and with smaller chunks. Secondly, for some protocols,
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there's a benefit of having a larger buffer for performance.
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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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This buffer size is by default \fICURL_MAX_WRITE_SIZE\fP (16kB). The maximum
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buffer size allowed to be set is \fICURL_MAX_READ_SIZE\fP (512kB). The minimum
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buffer size allowed to be set is 1024.
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DO NOT set this option on a handle that is currently used for an active
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transfer as that may lead to unintended consequences.
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.SH DEFAULT
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CURL_MAX_WRITE_SIZE (16kB)
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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 receive buffer */
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curl_easy_setopt(curl, CURLOPT_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 7.10. Growing the buffer was added in 7.53.0.
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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_MAX_RECV_SPEED_LARGE "(3), " CURLOPT_WRITEFUNCTION "(3), "
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