Provided by: libcurl4-doc_7.47.0-1ubuntu2.19_all 

NAME
CURLOPT_STDERR - redirect stderr to another stream
SYNOPSIS
#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_STDERR, FILE *stream);
DESCRIPTION
Pass a FILE * as parameter. Tell libcurl to use this stream instead of stderr when showing the progress
meter and displaying CURLOPT_VERBOSE(3) data.
DEFAULT
stderr
PROTOCOLS
All
EXAMPLE
CURL *curl = curl_easy_init();
FILE *filep = fopen("dump", "wb");
if(curl) {
curl_easy_setopt(curl, CURLOPT_URL, "http://example.com");
curl_easy_setopt(curl, CURLOPT_STDERR, filep);
curl_easy_perform(curl);
}
AVAILABILITY
Always
RETURN VALUE
Returns CURLE_OK
SEE ALSO
CURLOPT_VERBOSE(3), CURLOPT_NOPROGRESS(3),
libcurl 7.37.0 17 Jun 2014 CURLOPT_STDERR(3)