CURLOPT_CONNECTTIMEOUT_MS

CURLOPT_CONNECTTIMEOUT_MS is one of the accepted parameters for curl_setopt parameter #2.

CURLOPT_CONNECTTIMEOUT_MS — The number of milliseconds to wait while trying to connect. Use 0 to wait indefinitely.

 If libcurl is built to use the standard system name resolver, that
 portion of the connect will still use full-second resolution for
 timeouts with a minimum timeout allowed of one second. Available as of cURL 7.16.2.

CURLOPT_CONNECTTIMEOUT_MS = 156;