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                     23: .TH CURLOPT_UPLOAD_BUFFERSIZE 3 "August 18, 2018" "libcurl 7.70.0" "curl_easy_setopt options"
                     24: 
                     25: .SH NAME
                     26: CURLOPT_UPLOAD_BUFFERSIZE \- set preferred upload buffer size
                     27: .SH SYNOPSIS
                     28: #include <curl/curl.h>
                     29: 
                     30: CURLcode curl_easy_setopt(CURL *handle, CURLOPT_UPLOAD_BUFFERSIZE, long size);
                     31: .SH DESCRIPTION
                     32: Pass a long specifying your preferred \fIsize\fP (in bytes) for the upload
                     33: buffer in libcurl. It makes libcurl uses a larger buffer that gets passed to
                     34: the next layer in the stack to get sent off. In some setups and for some
                     35: protocols, there's a huge performance benefit of having a larger upload
                     36: buffer.
                     37: 
                     38: This is just treated as a request, not an order. You cannot be guaranteed to
                     39: actually get the given size.
                     40: 
                     41: The upload buffer size is by default 64 kilobytes. The maximum buffer size
                     42: allowed to be set is 2 megabytes. The minimum buffer size allowed to be set is
                     43: 16 kilobytes.
                     44: 
                     45: Since curl 7.61.1 the upload buffer is allocated on-demand - so if the handle
                     46: isn't used for upload, this buffer will not be allocated at all.
                     47: .SH DEFAULT
                     48: 64 kB
                     49: .SH PROTOCOLS
                     50: All
                     51: .SH EXAMPLE
                     52: .nf
                     53: CURL *curl = curl_easy_init();
                     54: if(curl) {
                     55:   curl_easy_setopt(curl, CURLOPT_URL, "sftp://example.com/foo.bin");
                     56: 
                     57:   /* ask libcurl to allocate a larger upload buffer */
                     58:   curl_easy_setopt(curl, CURLOPT_UPLOAD_BUFFERSIZE, 120000L);
                     59: 
                     60:   ret = curl_easy_perform(curl);
                     61: 
                     62:   curl_easy_cleanup(curl);
                     63: }
                     64: .fi
                     65: .SH AVAILABILITY
                     66: Added in 7.62.0.
                     67: .SH RETURN VALUE
                     68: Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
                     69: .SH "SEE ALSO"
                     70: .BR CURLOPT_BUFFERSIZE "(3), " CURLOPT_READFUNCTION "(3), "