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.TH CURLOPT_UPLOAD_BUFFERSIZE 3 "May 06, 2021" "libcurl 7.77.0" "curl_easy_setopt options"

.SH NAME
CURLOPT_UPLOAD_BUFFERSIZE \- set preferred upload buffer size
.SH SYNOPSIS
#include <curl/curl.h>

CURLcode curl_easy_setopt(CURL *handle, CURLOPT_UPLOAD_BUFFERSIZE, long size);
.SH DESCRIPTION
Pass a long specifying your preferred \fIsize\fP (in bytes) for the upload
buffer in libcurl. It makes libcurl uses a larger buffer that gets passed to
the next layer in the stack to get sent off. In some setups and for some
protocols, there's a huge performance benefit of having a larger upload
buffer.

This is just treated as a request, not an order. You cannot be guaranteed to
actually get the given size.

The upload buffer size is by default 64 kilobytes. The maximum buffer size
allowed to be set is 2 megabytes. The minimum buffer size allowed to be set is
16 kilobytes.

Since curl 7.61.1 the upload buffer is allocated on-demand - so if the handle
isn't used for upload, this buffer will not be allocated at all.

DO NOT set this option on a handle that is currently used for an active
transfer as that may lead to unintended consequences.
.SH DEFAULT
64 kB
.SH PROTOCOLS
All
.SH EXAMPLE
.nf
CURL *curl = curl_easy_init();
if(curl) {
  curl_easy_setopt(curl, CURLOPT_URL, "sftp://example.com/foo.bin");

  /* ask libcurl to allocate a larger upload buffer */
  curl_easy_setopt(curl, CURLOPT_UPLOAD_BUFFERSIZE, 120000L);

  ret = curl_easy_perform(curl);

  curl_easy_cleanup(curl);
}
.fi
.SH AVAILABILITY
Added in 7.62.0.
.SH RETURN VALUE
Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
.SH "SEE ALSO"
.BR CURLOPT_BUFFERSIZE "(3), " CURLOPT_READFUNCTION "(3), "
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