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CURLOPT_UP..._BUFFERSIZE(3) Library Functions Manual CURLOPT_UP..._BUFFERSIZE(3) NAME CURLOPT_UPLOAD_BUFFERSIZE - upload buffer size SYNOPSIS #include <curl/curl.h> CURLcode curl_easy_setopt(CURL *handle, CURLOPT_UPLOAD_BUFFERSIZE, long size); DESCRIPTION Pass a long specifying your preferred size (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 proto- cols, there is a huge performance benefit of having a larger upload buffer. This is treated as a request, not an order. You cannot be guaranteed to ac- tually 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. The upload buffer is allocated on-demand - so if the handle is not used for upload, this buffer is not 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. DEFAULT 65536 bytes PROTOCOLS This functionality affects all supported protocols EXAMPLE int main(void) { CURL *curl = curl_easy_init(); if(curl) { CURLcode result; 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); result = curl_easy_perform(curl); curl_easy_cleanup(curl); } } AVAILABILITY Added in curl 7.62.0 RETURN VALUE curl_easy_setopt(3) returns a CURLcode indicating success or error. CURLE_OK (0) means everything was OK, non-zero means an error occurred, see libcurl-errors(3). SEE ALSO CURLOPT_BUFFERSIZE(3), CURLOPT_READFUNCTION(3), CURLOPT_TCP_NODELAY(3) libcurl 2026-06-11 CURLOPT_UP..._BUFFERSIZE(3)
NAME | SYNOPSIS | DESCRIPTION | DEFAULT | PROTOCOLS | EXAMPLE | AVAILABILITY | RETURN VALUE | SEE ALSO
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