Tribblix: manual page: CURLOPT

CURLOPT_STDERR(3) Introduction to Library Functions CURLOPT_STDERR(3)

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.

If you are using libcurl as a Windows DLL, this option causes an
exception and a crash in the library since it cannot access a FILE *
passed on from the application. A work-around is to instead use
CURLOPT_DEBUGFUNCTION(3).

DEFAULT

stderr

PROTOCOLS

This functionality affects all supported protocols

EXAMPLE

int main(void)
{
CURL *curl = curl_easy_init();
FILE *filep = fopen("dump", "wb");
if(curl) {
curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
curl_easy_setopt(curl, CURLOPT_STDERR, filep);

curl_easy_perform(curl);
}
}

AVAILABILITY

Added in curl 7.1

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).