Provided by: libcurl4-doc_7.55.1-1ubuntu2_all bug

NAME

       CURLOPT_BUFFERSIZE - set preferred 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's 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 (512kB). The minimum buffer size  allowed  to  be  set  is
       1024.

DEFAULT

       CURL_MAX_WRITE_SIZE (16kB)

PROTOCOLS

       All

EXAMPLE

       CURL *curl = curl_easy_init();
       if(curl) {
         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);

         ret = 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_WRITEFUNCTION(3),