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Some code (e.g. Curl_fillreadbuffer) assumes that this buffer is not exceedingly tiny and will break if it is. This same check is already done at run time in the CURLOPT_BUFFERSIZE option.
66 lines
2.5 KiB
Groff
66 lines
2.5 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, 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.haxx.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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.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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