2024-03-16 02:55:33 +00:00
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.\" generated by cd2nroff 0.1 from CURLOPT_UPLOAD_BUFFERSIZE.md
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2024-06-01 20:49:19 +00:00
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.TH CURLOPT_UPLOAD_BUFFERSIZE 3 "2024-06-01" libcurl
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2024-03-16 02:55:33 +00:00
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.SH NAME
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CURLOPT_UPLOAD_BUFFERSIZE \- upload buffer size
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.SH SYNOPSIS
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.nf
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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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.fi
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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 is 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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The upload buffer is allocated on\-demand \- so if the handle is not used for
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upload, this buffer is not allocated at all.
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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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65536 bytes
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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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int main(void)
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{
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CURL *curl = curl_easy_init();
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if(curl) {
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CURLcode res;
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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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res = curl_easy_perform(curl);
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curl_easy_cleanup(curl);
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}
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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),
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.BR CURLOPT_READFUNCTION (3),
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.BR CURLOPT_TCP_NODELAY (3)
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