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CURLINFO_CONTENT_LENGTH_UPLOAD - get the specified size of the upload #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 is not known. CURLINFO_CONTENT_LENGTH_UPLOAD_T(3) is a newer replacement that returns a more sensible variable type. All

CURL *curl = curl_easy_init();
if(curl) {
 curl_easy_setopt(curl, CURLOPT_URL, "https://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_UPLOAD, &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), " CURLINFO_CONTENT_LENGTH_DOWNLOAD_T "(3), "