CURLOPT_PROGRESSDATA(3) - Man pages

CURLOPT_PROGRESSDATA(3)     Library Functions Manual    CURLOPT_PROGRESSDATA(3)

NAME
       CURLOPT_PROGRESSDATA - pointer passed to the progress callback

SYNOPSIS
       #include <curl/curl.h>

       CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROGRESSDATA, void *pointer);

DESCRIPTION
       Pass  a pointer that is untouched by libcurl and passed as the first ar-
       gument in the progress callback set with CURLOPT_PROGRESSFUNCTION(3).

DEFAULT
       NULL

PROTOCOLS
       This functionality affects all supported protocols

EXAMPLE
       struct progress {
         char *private;
         size_t size;
       };

       static int progress_callback(void *clientp,
                                    double dltotal,
                                    double dlnow,
                                    double ultotal,
                                    double ulnow)
       {
         struct progress *memory = clientp;
         printf("private: %p\n", memory->private);

         /* use the values */

         return 0; /* all is good */
       }

       int main(void)
       {
         CURL *curl = curl_easy_init();
         if(curl) {
           struct progress data;

           /* pass struct to callback  */
           curl_easy_setopt(curl, CURLOPT_PROGRESSDATA, &data);
           curl_easy_setopt(curl, CURLOPT_PROGRESSFUNCTION, progress_callback);

           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).

SEE ALSO
       CURLOPT_PROGRESSFUNCTION(3), CURLOPT_XFERINFOFUNCTION(3)

libcurl                            2026-07-12           CURLOPT_PROGRESSDATA(3)

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