CURLOPT_STDERR(3) Library Functions Manual CURLOPT_STDERR(3)

CURLOPT_STDERR - redirect stderr to another stream

#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_STDERR, FILE *stream);

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).

stderr

All

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);
  }
}

Always

Returns CURLE_OK

CURLOPT_DEBUGFUNCTION(3), CURLOPT_NOPROGRESS(3), CURLOPT_VERBOSE(3)

2024-05-22 libcurl