NAME

       CURLOPT_BUFFERSIZE - receive buffer size

SYNOPSIS

       #include <curl/curl.h>

       CURLcode curl_easy_setopt(CURL *handle, CURLOPT_BUFFERSIZE, long size);

DESCRIPTION

       Pass  a long specifying your preferred size (in bytes) for the receive buffer in libcurl.  The main point
       of this would be that the write callback gets called more often and with smaller  chunks.  Secondly,  for
       some protocols, there is a benefit of having a larger buffer for performance.

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

       This  buffer  size is by default CURL_MAX_WRITE_SIZE (16kB). The maximum buffer size allowed to be set is
       CURL_MAX_READ_SIZE (10MB). The minimum buffer size allowed to be set is 1024.

       DO NOT set this option on a handle that is currently used for an active transfer  as  that  may  lead  to
       unintended consequences.

       The maximum size was 512kB until 7.88.0.

DEFAULT

       CURL_MAX_WRITE_SIZE (16kB)

PROTOCOLS

       All

EXAMPLE

       int main(void)
       {
         CURL *curl = curl_easy_init();
         if(curl) {
           CURLcode res;
           curl_easy_setopt(curl, CURLOPT_URL, "sftp://example.com/foo.bin");

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

           res = curl_easy_perform(curl);

           curl_easy_cleanup(curl);
         }
       }

AVAILABILITY

       Added in 7.10.  Growing the buffer was added in 7.53.0.

RETURN VALUE

       Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.

SEE ALSO

       CURLOPT_MAX_RECV_SPEED_LARGE(3),           CURLOPT_MAXFILESIZE(3),          CURLOPT_UPLOAD_BUFFERSIZE(3),
       CURLOPT_WRITEFUNCTION(3)

ibcurl 8.5.0                                    December 04, 2023                          CURLOPT_BUFFERSIZE(3)