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CURLINFO_SPEED_UPLOAD - get upload speed #include <curl/curl.h> CURLcode curl_easy_getinfo(CURL *handle, CURLINFO_SPEED_UPLOAD, double *speed); Pass a pointer to a double to receive the average upload speed that curl measured for the complete upload. Measured in bytes/second. CURLINFO_SPEED_UPLOAD_T(3) is a newer replacement that returns a more sensible variable type.

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

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

 if(!res) {
 double speed;
 res = curl_easy_getinfo(curl, CURLINFO_SPEED_UPLOAD, &speed);
 if(!res) {
 printf("Upload speed %.0f bytes/sec\\n", ul);
 }
 }
}

Added in Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not. curl_easy_getinfo "(3), " curl_easy_setopt "(3), " CURLINFO_SPEED_DOWNLOAD "(3), "