CURLINFO_CONTENT_LENGTH_UPLOAD man page

#include <curl/curl.h>

CURLcode curl_easy_getinfo(CURL *handle, CURLINFO_CONTENT_LENGTH_UPLOAD,
                          double *content_length);

Pass a pointer to a double to receive the specified size of the upload.  Since 7.19.4, this returns -1 if the size isn't known.

All

CURL *curl = curl_easy_init();
if(curl) {
  curl_easy_setopt(curl, CURLOPT_URL, "http://example.com");

  /* Perform the upload */
  res = curl_easy_perform(curl);

  if(!res) {
    /* check the size */
    double cl;
    res = curl_easy_getinfo(curl, CURLINFO_CONTENT_LENGTH_DOWNLOAD, &cl);
    if(!res) {
      printf("Size: %.0f\n", cl);
    }
  }
}

Added in 7.6.1

Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.

curl_easy_getinfo(3), curl_easy_setopt(3),

curl_easy_getinfo(3), CURLINFO_CONTENT_LENGTH_DOWNLOAD(3).